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Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
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1

Variable Frequency Drives: Energy Savings and Impact on Motor Performance  

E-Print Network (OSTI)

Variable frequency drives (VFDs) have found widespread application in recent years. VFDs are valued for their potential to save energy and improve processes. Reliability has improved significantly, but there are still pitfalls to be addressed in properly applying VFDs. The benefits and pitfalls in applying VFDs that will be addressed by this paper include- Benefits: Energy Savings, Improved Process Control, Soft Start Reduced Mechanical Stress, Improved Electrical System Power Factor, and Pitfalls: Motor Acoustic Noise, Motor Heating. This paper is intended for plant engineers and maintenance personnel who have some practical experience with electrical and mechanical equipment, but are not VFD experts.

Petro, D.

1993-03-01T23:59:59.000Z

2

Section 5.7.2 Variable-Frequency Motors: Greening Federal Facilities...  

NLE Websites -- All DOE Office Websites (Extended Search)

major VFD designs are commonly used: pulse- width modulation (PWM), current source inverter (CSI), and variable voltage inverter (VVI). A fourth type, the flux vector PWM drive,...

3

Energy Savings of Variable Speed Motors  

E-Print Network (OSTI)

This paper investigates the energy savings available by utilizing variable speed motors on pump and fan applications. Conventional control of flow or pressure in process plants is normally accomplished by throttling the various streams with control valves. Depending on the system and the actual operating conditions, this throttling may consume a considerable amount of energy. The hydraulics of different systems are investigated to generalize high energy saving applications. Typical pump characteristics at varying speeds are investigated since most performance curves are only available at a constant speed. The various types of variable speed electric motors are discussed. However, the primary variable speed system recommended is a variable frequency speed system which utilizes standard induction motors. Specific cases of centrifugal pump applications and cooling tower fan service are presented. Turndown frequencies, stream factors, and electric rates are included in the evaluation. The energy savings of a variable speed system becomes significant when flow rates vary widely and the electrical rates are high.

Fishel, F. D.

1979-01-01T23:59:59.000Z

4

Frequency modulation drive for a piezoelectric motor  

DOE Patents (OSTI)

A piezoelectric motor has peak performance at a specific frequency f.sub.1 that may vary over a range of frequencies. A drive system is disclosed for operating such a motor at peak performance without feedback. The drive system consists of the motor and an ac source connected to power the motor, the ac source repeatedly generating a frequency over a range from f.sub.1 -.DELTA.x to f.sub.1 +.DELTA.y.

Mittas, Anthony (Albuquerque, NM)

2001-01-01T23:59:59.000Z

5

Motor monitoring method and apparatus using high frequency ...  

A motor current analysis method and apparatus for monitoring electrical-motor-driven devices. The method and apparatus utilize high frequency portions of the motor ...

6

Variable current speed controller for eddy current motors  

DOE Patents (OSTI)

A speed control system for eddy current motors is provided in which the current to the motor from a constant frequency power source is varied by comparing the actual motor speed signal with a setpoint speed signal to control the motor speed according to the selected setpoint speed. A three-phase variable voltage autotransformer is provided for controlling the voltage from a three-phase power supply. A corresponding plurality of current control resistors is provided in series with each phase of the autotransformer output connected to inputs of a three-phase motor. Each resistor is connected in parallel with a set of normally closed contacts of plurality of relays which are operated by control logic. A logic circuit compares the selected speed with the actual motor speed obtained from a digital tachometer monitoring the motor spindle speed and operated the relays to add or substract resistance equally in each phase of the motor input to vary the motor current to control the motor at the selected speed.

Gerth, H.L.; Bailey, J.M.; Casstevens, J.M.; Dixon, J.H.; Griffith, B.O.; Igou, R.E.

1982-03-12T23:59:59.000Z

7

Motor monitoring method and apparatus using high frequency current components  

DOE Patents (OSTI)

A motor current analysis method and apparatus for monitoring electrical-motor-driven devices. The method and apparatus utilize high frequency portions of the motor current spectra to evaluate the condition of the electric motor and the device driven by the electric motor. The motor current signal produced as a result of an electric motor is monitored and the low frequency components of the signal are removed by a high-pass filter. The signal is then analyzed to determine the condition of the electrical motor and the driven device.

Casada, Donald A. (Knoxville, TN)

1996-01-01T23:59:59.000Z

8

Motor monitoring method and apparatus using high frequency current components  

DOE Patents (OSTI)

A motor current analysis method and apparatus for monitoring electrical-motor-driven devices are disclosed. The method and apparatus utilize high frequency portions of the motor current spectra to evaluate the condition of the electric motor and the device driven by the electric motor. The motor current signal produced as a result of an electric motor is monitored and the low frequency components of the signal are removed by a high-pass filter. The signal is then analyzed to determine the condition of the electrical motor and the driven device. 16 figs.

Casada, D.A.

1996-05-21T23:59:59.000Z

9

Method and apparatus for monitoring the rotating frequency of de-energized induction motors  

DOE Patents (OSTI)

The rotational speed of a coasting induction motor is measured by sensing e residual electrical voltages at the power terminals of the motor, thus eliminating the need for conventional tachometer equipment, additional mechanical components or modifications to the induction motor itself. The power terminal voltage signal is detected and transformed into a DC voltage proportional to the frequency of the signal. This DC voltage can be input to the control system of a variable frequency motor controller to regulate the output characteristics thereof relative to the speed of the coasting motor.

Mikesell, Harvey E. (McMurray, PA); Lucy, Eric (Murrysville, PA)

1998-01-01T23:59:59.000Z

10

Method and apparatus for monitoring the rotating frequency of de-energized induction motors  

DOE Patents (OSTI)

The rotational speed of a coasting induction motor is measured by sensing e residual electrical voltages at the power terminals of the motor, thus eliminating the need for conventional tachometer equipment, additional mechanical components or modifications to the induction motor itself. The power terminal voltage signal is detected and transformed into a DC voltage proportional to the frequency of the signal. This DC voltage can be input to the control system of a variable frequency motor controller to regulate the output characteristics thereof relative to the speed of the coasting motor. 6 figs.

Mikesell, H.E.; Lucy, E.

1998-02-03T23:59:59.000Z

11

Variable frequency microwave furnace system  

DOE Patents (OSTI)

A variable frequency microwave furnace system designed to allow modulation of the frequency of the microwaves introduced into a furnace cavity for testing or other selected applications. The variable frequency microwave furnace system includes a microwave signal generator or microwave voltage-controlled oscillator for generating a low-power microwave signal for input to the microwave furnace. A first amplifier may be provided to amplify the magnitude of the signal output from the microwave signal generator or the microwave voltage-controlled oscillator. A second amplifier is provided for processing the signal output by the first amplifier. The second amplifier outputs the microwave signal input to the furnace cavity. In the preferred embodiment, the second amplifier is a traveling-wave tube (TWT). A power supply is provided for operation of the second amplifier. A directional coupler is provided for detecting the direction of a signal and further directing the signal depending on the detected direction. A first power meter is provided for measuring the power delivered to the microwave furnace. A second power meter detects the magnitude of reflected power. Reflected power is dissipated in the reflected power load. 5 figs.

Bible, D.W.; Lauf, R.J.

1994-06-14T23:59:59.000Z

12

High Frequency Effects of Variable Frequency Drives (VFD) on Electrical Submersible Pump (ESP) Systems  

E-Print Network (OSTI)

Variable frequency drives (VFD) and subsea (umbilical) cables are frequently used in electrical submersible pump (ESP) systems for offshore platforms. There are two basic system configurations for ESP systems; VFD can be installed on the platform and the motor is connected to it through an umbilical cable, and VFD and the motor are installed closely and they are connected to the system through an umbilical cable. In this thesis, the pros and cons of each configuration are mentioned, but the focus is on the system with a VFD controlled motor through a long umbilical cable. A 36-pulse VFD is studied. Since multilevel VFDs have high frequency harmonics, high frequency modeling of the umbilical cable is used, and skin effect is also taken into consideration in the cable. The effect of the interactions between the umbilical cable and high frequency harmonics on the motor terminal voltage is explored.

Ozkentli, Esra

2012-08-01T23:59:59.000Z

13

Variable-reluctance motors for electric vehicle propulsion  

SciTech Connect

This paper discusses the design, operation, and expected performance of a 60-kW variable-reluctance motor and inverter-designed for electric vehicle propulsion. To substantiate the performance of this system, experimental data obtained with a prototype 3.8-kW motor and inverter are provided.

Vallese, F.J.; Lang, J.H.

1985-01-01T23:59:59.000Z

14

ESP-The Electrical submersible pump. Part 7. Applying variable frequency drives to ESPs  

SciTech Connect

To keep pace with technology, the oil industry has begun using variable frequency drives on electrical submersible pumps. Applying variable frequency drives on ESPs began seriously in 1977. In March 1983, there were approximately 350 variable frequency drives successfully operating on electrical submersible pumps throughout the world. Three types of variable frequency drives available today are the current source inverter, the pulse width modulation, and the variable voltage source inverter. As all three types have good points and bad, a short discussion of each type is essential to understand why the variable voltage inverter is used most often in oil field applications and why it has been a success. A current source inverter typically uses a phasecontrolled rectifier to generate variable DC current. The phase-controlled rectifier produces the required current which is subsequently filtered by a DC link reactor. The inverter then produces the desired variable frequency current and the motor voltage varies with load.

Watson, A.J.

1983-11-15T23:59:59.000Z

15

Guide to the Industrial Application of Motors and Variable-Speed Drives  

Science Conference Proceedings (OSTI)

This application guide is intended to aid in screening, selecting, and procuring specification processes for variable frequency drive (VFD) installations. It also is intended to provide a comprehensive up-to-date assessment of opportunities to save energy and improve power quality performance with state-of-the-art VFD technologies. The document supplies background information on electric motors and applications, describes VFD topologies, and details procurement specifications and application consideratio...

2001-09-27T23:59:59.000Z

16

Information Theory and Predictability for Low-Frequency Variability  

Science Conference Proceedings (OSTI)

A predictability framework, based on relative entropy, is applied here to low-frequency variability in a standard T21 barotropic model on the sphere with realistic orography. Two types of realistic climatology, corresponding to different heights ...

Rafail Abramov; Andrew Majda; Richard Kleeman

2005-01-01T23:59:59.000Z

17

Homoclinic Dynamics: A Scenario for Atmospheric Ultralow-Frequency Variability  

Science Conference Proceedings (OSTI)

In this paper, a link will be established between atmospheric ultralow-frequency variability (ULFV) and the occurrence of homoclinic dynamics in models of large-scale atmospheric flow. It is known that uncoupled atmosphere models possess ...

Daan T. Crommelin

2002-05-01T23:59:59.000Z

18

Low-Frequency Variability in the Wind-Driven Circulation  

Science Conference Proceedings (OSTI)

The origins of low-frequency variability in a simple homogenous ocean model, forced by a double gyre Ekman suction, are examined numerically. It is found that irregular, large amplitude vacillations in the structure of the circulation typify the ...

S. P. Meacham

2000-02-01T23:59:59.000Z

19

Abstract Efficiency issues of variable-capacitance micromotors are discussed in context of combined drive and motor  

E-Print Network (OSTI)

of combined drive and motor interaction. It is shown that variable-capacitance motors ideally have nearly, the drive system consisting of both the motor and electronics is not ideal when considering different motors, electric drives, efficiency I. INTRODUCTION An active area of research for commercial

Chapman, Patrick

20

Eddy-Induced Instability for Low-Frequency Variability  

Science Conference Proceedings (OSTI)

Synoptic eddymean flow interaction has been recognized as one of the key sources for extratropical low-frequency variability. In this paper, the underlying dynamics of this interaction are examined from the perspective of a synoptic eddy-induced ...

F-F. Jin

2010-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Variable-speed blower motors gaining ground in residential HVAC market  

SciTech Connect

Variable-speed blowers with electronically commutated permanent-magnet motors are gaining ground in the residential forced-air HVAC market. Variable-speed blower motors offer better comfort, better air mixing, lower noise, and tighter temperature and humidity control, as well as higher efficiency and lower peak demand than the constant-speed blower motors installed in most standard systems. Although these benefits cost considerably more up front, some homeowners think the extra cost is justified. Sales are increasing dramatically, and although variable-speed units made up less than three percent of the market in 1993, industry representatives predict that variable-speed blower motors may become the standard within ten to twenty years. The benefits of variable-speed gas furnaces also open up the potential for collaboration between gas and electric utilities. The best way for an electric utility to encourage customers to consider variable-speed gas furnaces may be through the gas utility, since homeowners look to the gas utility when it`s time to make a decision about a gas furnace purchase. Gas utilities can also benefit from variable speed by providing their customers better comfort, and possibly by reducing the customer`s gas bill (due to zoning or better control).

Gregerson, J.

1994-12-31T23:59:59.000Z

22

Variable speed constant frequency constant voltage alternator. Annual report  

DOE Green Energy (OSTI)

A test alternator is operated with digital control of its output frequency for variable shaft speed. The machine is a two-pole alternator with power removed through slip rings. The output frequency of the alternator is controlled by rotating the field by stepping through sixteen coils around the rotor. Usually four coils are active at one time. The rotating field in the stationary coils of the stator is controlled by microcircuits. The control circuits are constructed with available low-cost, low-power integrated circuits (ICs). The test results from the first test alternator indicate the feasibility of using this type of alternator to convert available wind power directly to usable 60 hertz power.

Grannemann, W.W.; Yang, C.E.; Seo, P.H.

1980-07-01T23:59:59.000Z

23

Analysis and Simulation of Mechanical Trains Driven by Variable Frequency Drive Systems  

E-Print Network (OSTI)

Induction motors and Variable Frequency Drives (VFDs) are widely used in industry to drive machinery trains. However, some mechanical trains driven by VFD-motor systems have encountered torsional vibration problems. This vibration can induce large stresses on shafts and couplings, and reduce the lifetime of these mechanical parts. Long before the designed lifetime, the mechanical train may encounter failure. This thesis focuses on VFDs with voltage source rectifiers for squirrel-cage induction motors of open-loop Volts/Hertz and closed-loop Field Oriented Control (FOC). First, the torsional vibration problems induced by VFDs are introduced. Then, the mathematical model for a squirrel-cage induction motor is given. Two common control methods used in VFD are discussed - open-loop Volts/Hertz and closed-loop FOC. SimPowerSystems and SimMechanics are used as the modeling software for electrical systems and mechanical systems respectively. Based on the models and software, two interface methods are provided for modeling the coupled system. A simple system is tested to verify the interface methods. The study of open-loop Volts/Hertz control method is performed. The closed-form of electromagnetic torque sideband frequency due to Pulse Width Modulation is given. A torsional resonance case is illustrated. The effects of non-ideal power switches are studied, which shows little in uence on the system response but which uses little energy consumption. A study of a non-ideal DC bus indicates that a DC bus voltage ripple can also induce a big torsional vibration. Next, the study of the closed-loop FOC control method is presented. Simulation for a complete VFD machinery train is performed. With the recti er and DC bus dynamic braking, the system shows a better performance than the ideal-DC bus case. Lastly, a parametric study of the FOC controller is performed. The effects of primary parameters are discussed. The results indicate that some control parameters (i.e. speed ramps, proportional gain in speed PI controller) are also responsible for the mechanical torsional vibration.

Han, Xu

2010-12-01T23:59:59.000Z

24

Jet Jumping: Low-Frequency Variability in the Southern Ocean  

Science Conference Proceedings (OSTI)

The authors study intrinsic variability in the position of jets in a ?-plane channel ocean with simple topography using a quasigeostrophic numerical model. This study links the variability in jet position with abyssal anticyclones that form as a ...

Christopher C. Chapman; Andrew McC. Hogg

2013-05-01T23:59:59.000Z

25

Offshore operations report. ESP - the electrical submersible pump. Part 7. Applying variable frequency drives to esps  

SciTech Connect

The oil industry has begun using variable frequency drives on electric submersible pumps. In March 1983, there were approximately 350 variable frequency drives successfully operating on electrical submersible pumps throughout the world. Three types of variable frequency drives available are the current source inverter, the pulse width modulation, and the variable voltage source inverter. A short discussion of each type is given to explain why the variable voltage inverter is used most often in oil field applications and why it has been a success.

Watson, A.J.

1983-11-15T23:59:59.000Z

26

Simulation of North Atlantic Low-Frequency SST Variability  

Science Conference Proceedings (OSTI)

The role of atmospheric circulation anomalies in generating midlatitude sea surface temperature (SST) variability is investigated by means of ocean general circulation model (OGCM) experiments, in which observed winds are prescribed during the ...

Ute Luksch

1996-09-01T23:59:59.000Z

27

Mechanisms of Monsoon Low-Frequency Variability: Surface Hydrological Effects  

Science Conference Proceedings (OSTI)

Observations indicate that monsoon systems are characterized by orderly large-scale and low-frequency variations. With a time scale of two weeks and sometimes longer, regions of ascending motion are observed to form to the north of the equator ...

Peter J. Webster

1983-09-01T23:59:59.000Z

28

Stationary Wave Accumulation and the Generation of Low-Frequency Variability on Zonally Varying Flows  

Science Conference Proceedings (OSTI)

A potent mechanism for the generation of low-frequency atmospheric variability on vortex basic states consisting of a single potential vorticity jump, or contour, separating two regions of uniform equivalent barotropic potential vorticity is ...

K. L. Swanson

2000-07-01T23:59:59.000Z

29

Low-Frequency Variability in a Baroclinic ? Channel with LandSea Contrast  

Science Conference Proceedings (OSTI)

Atmospheric low-frequency variability (LFV) is studied in a two-layer quasigeostrophic model. The model geometry is a periodic ? channel with flat bottom and zonally inhomogeneous thermal forcing. As a result of the idealized landsea contrast, ...

S. Kravtsov; A. W. Robertson; M. Ghil

2003-09-01T23:59:59.000Z

30

Low-Frequency Variability and Remote Forcing of Gap Winds over the East Pacific Warm Pool  

Science Conference Proceedings (OSTI)

The low-frequency variability of gap winds at the Isthmuses of Tehuantepec and Papagayo is investigated using a 17-yr wind stress dataset merging the remotely sensed observations of Special Sensor Microwave Imager (SSM/I) and Quick Scatterometer (...

Kristopher B. Karnauskas; Antonio J. Busalacchi; Raghu Murtugudde

2008-10-01T23:59:59.000Z

31

Empirical Mode Reduction in a Model of Extratropical Low-Frequency Variability  

Science Conference Proceedings (OSTI)

This paper constructs and analyzes a reduced nonlinear stochastic model of extratropical low-frequency variability. To do so, it applies multilevel quadratic regression to the output of a long simulation of a global baroclinic, quasigeostrophic, ...

D. Kondrashov; S. Kravtsov; M. Ghil

2006-07-01T23:59:59.000Z

32

Enhanced Recovery Utilizing Variable Frequency Drives and a Distributed Power System  

Science Conference Proceedings (OSTI)

This report describes complete results of the project entitled ''Enhanced Recovery Utilizing Variable Frequency Drives and a Distributed Power System''. This demonstration project was initiated in July 2003 and completed in March 2005. The objective of the project was to develop an integrated power production/variable frequency drive system that could easily be deployed in the oil field that would increase production and decrease operating costs. This report describes all the activities occurred and documents results of the demonstration.

Randy Peden; Sanjiv Shah

2005-07-26T23:59:59.000Z

33

Geographical Variations of the Influence of Low-Frequency Variability on Lower-Tropospheric Extreme Westerly Wind Events  

Science Conference Proceedings (OSTI)

A conceptual framework is developed for quantifying the relationship between low-frequency variability and extreme events. In this framework, variability is decomposed into low-frequency and synoptic components using complementary 10-day low-pass ...

Jeffrey H. Yin; Grant W. Branstator

2008-09-01T23:59:59.000Z

34

Low-Frequency Variability in the Arctic Atmosphere, Sea Ice, and Upper-Ocean Climate System  

Science Conference Proceedings (OSTI)

The low-frequency natural variability of the arctic climate system is modeled using a single-column, energy balance model of the atmosphere. sea ice, and upper-ocean system. Variability in the system is induced by forcing with realistic, random ...

C. M. Bitz; D. S. Battisti; R. E. Moritz; J. A. Beesley

1996-02-01T23:59:59.000Z

35

Power applications of high-temperature superconductivity: Variable speed motors, current switches, and energy storage for end use  

DOE Green Energy (OSTI)

The objective of this project is to conduct joint research and development activities related to certain electric power applications of high-temperature superconductivity (HTS). The new superconductors may allow development of an energy-efficient switch to control current to variable speed motors, superconducting magnetic energy storage (SMES) systems, and other power conversion equipment. Motor types that were considered include induction, permanent magnet, and superconducting ac motors. Because it is impractical to experimentally alter certain key design elements in radial-gap motors, experiments were conducted on an axial field superconducting motor prototype using 4 NbTi magnets. Superconducting magnetic energy storage technology with 0.25--5 kWh stored energy was studied as a viable solution to short duration voltage sag problems on the customer side of the electric meter. The technical performance characteristics of the device wee assembled, along with competing technologies such as active power line conditioners with storage, battery-based uninterruptible power supplies, and supercapacitors, and the market potential for SMES was defined. Four reports were prepared summarizing the results of the project.

Hawsey, R.A. [Oak Ridge National Lab., TN (United States); Banerjee, B.B.; Grant, P.M. [Electric Power Research Inst., Palo Alto, CA (United States)

1996-08-01T23:59:59.000Z

36

Low-Frequency Pycnocline Depth Variability at Ocean Weather Station P in the Northeast Pacific  

Science Conference Proceedings (OSTI)

Low-frequency variability of the depth of the main pycnocline at Ocean Weather Station P and over the northeast Pacific is examined in terms of the one-dimensional response to local Ekman pumping according to the Hasselmann stochastic climate ...

Patrick F. Cummins; Gary S. E. Lagerloef

2002-11-01T23:59:59.000Z

37

Forecast Skill and Low-Frequency Variability in NMC DERF90 Experiments  

Science Conference Proceedings (OSTI)

A series of 90-day integrations by a low-resolution version (T40) of the National Meteorological Center's global spectral model was analyzed for its performance as well as its low-frequency variability behavior. In particular, 5-day mean 500-mb ...

Wilbur Y. Chen; Huug M. van den Dool

1995-08-01T23:59:59.000Z

38

Low-Frequency Variability in the Northern Hemisphere Winter: Geographical Distribution, Structure and Time-Scale Dependence  

Science Conference Proceedings (OSTI)

Low-frequency variability in wintertime 500 mb height is examined, with emphasis on its structure, geographical distribution, and frequency dependence. A 39-year record of 500 mb geopotential height fields from the NMC analyses is time filtered ...

Yochanan Kushnir; John M. Wallace

1989-10-01T23:59:59.000Z

39

The Role of Pacific Climate on Low-Frequency Hydroclimatic Variability and Predictability in Southern Alberta, Canada  

Science Conference Proceedings (OSTI)

Wavelet and rank correlation analysis were used to identify the links between primary Pacific climate variability modes and low-frequency hydroclimatic variability in the South Saskatchewan River basin (SSRB) of southern Alberta. The April...

Adam K. Gobena; Thian Y. Gan

2009-12-01T23:59:59.000Z

40

Model of variable speed constant frequency double fed wind power generation system and analysis of its operating performance  

Science Conference Proceedings (OSTI)

Structure of variable speed constant frequency double fed wind power generation system (WPGS) was analyzed, and its model was established. Maximum power point tracking (MPPT) control, constant power control and vector control for WPGS were discussed. ... Keywords: operating performance, variable speed constant frequency, vector control, wind power generation system

Pan Tinglong; Ji Zhicheng

2009-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

On Robust Estimation of Low-Frequency Variability Trends in Discrete Markovian Sequences of Atmospheric Circulation Patterns  

Science Conference Proceedings (OSTI)

Identification and analysis of temporal trends and low-frequency variability in discrete time series is an important practical topic in the understanding and prediction of many atmospheric processes, for example, in analysis of climate change. ...

Illia Horenko

2009-07-01T23:59:59.000Z

42

Observations and EOF Analysis of Low-Frequency Variability in the Western Part of the Gulf Stream Recirculation  

Science Conference Proceedings (OSTI)

This study of low-frequency oceanic variability is based on data collected during the Long Term Upper Ocean Study (LOTUS), which was a two year program of (mainly) moored meteorological and oceanographic measurements. The mooring arrays were ...

Angelika Lippert; Melbourne G. Briscoe

1990-05-01T23:59:59.000Z

43

Contributions of ENSO and East Indian Ocean SSTA to the Interannual Variability of Northwest Pacific Tropical Cyclone Frequency  

Science Conference Proceedings (OSTI)

This study attempts to understand contributions of ENSO and the boreal summer sea surface temperature anomaly (SSTA) in the East Indian Ocean (EIO) to the interannual variability of tropical cyclone (TC) frequency over the western North Pacific (...

Ruifen Zhan; Yuqing Wang; Xiaotu Lei

2011-01-01T23:59:59.000Z

44

Reconstruction of the Extratropical NH Mean Temperature over the Last Millennium with a Method that Preserves Low-Frequency Variability  

Science Conference Proceedings (OSTI)

A new multiproxy reconstruction of the Northern Hemisphere extratropical mean temperature over the last millennium is presented. The reconstruction is performed with a novel method designed to avoid the underestimation of low-frequency variability ...

Bo Christiansen; Fredrik Charpentier Ljungqvist

2011-12-01T23:59:59.000Z

45

Impact of Atmospheric Intraseasonal Variability in the Indian Ocean: Low-Frequency Rectification in Equatorial Surface Current and Transport  

Science Conference Proceedings (OSTI)

An ocean general circulation model (OGCM) is used to investigate the low-frequency (period longer than 90 days) rectification of atmospheric intraseasonal variability (1090-day periods) in zonal surface current and transport of the equatorial ...

Weiqing Han; Peter Webster; Roger Lukas; Peter Hacker; Aixue Hu

2004-06-01T23:59:59.000Z

46

Phenomenology of the Low-Frequency Variability in a Reduced-Gravity, Quasigeostrophic Double-Gyre Model  

Science Conference Proceedings (OSTI)

The low-frequency variability of the oceanic wind-driven circulation is investigated by use of a reduced-gravity, quasigeostrophic model with slight variations on the classic double-gyre wind forcing. Approximately 30 eddy-resolving simulations ...

John D. McCalpin; Dale B. Haidvogel

1996-05-01T23:59:59.000Z

47

Structure of Oceanic and Atmospheric Low-Frequency Variability over the Tropical Pacific and Indian Oceans. Part I: COADS Observations  

Science Conference Proceedings (OSTI)

The recurrent modes of combined oceanic and atmospheric low-frequency variability over the tropical Pacific and Indian oceans are calculated to provide quantitatively and structurally well-defined targets for simulation/prediction studies of ...

Sumant Nigam; Horng-Syi Shen

1993-04-01T23:59:59.000Z

48

Dynamics and Practical Predictability of Extratropical Wintertime Low-Frequency Variability in a Low-Dimensional System  

Science Conference Proceedings (OSTI)

Dynamics and practical predictability of extratropical low-frequency variability (LFV) in Northern Hemisphere winter are examined in the framework of a two-dimensional (2D) stochastic differential equation (SDE) on the phase space spanned by two ...

Masaru Inatsu; Naoto Nakano; Hitoshi Mukougawa

2013-03-01T23:59:59.000Z

49

Comparing Two Types of Magnetically- Coupled Adjustable Speed Drives with Variable Frequency Drives in Pump and Fan Applications  

E-Print Network (OSTI)

This paper presents the results from laboratory tests on MagnaDrive Corporations fixed-magnet magnetically-coupled adjustable speed drive (MC-ASD) and Coyote Electronics electromagnetic MC-ASD as compared to a typical variable frequency drive (VFD) for typical fan and pump loads. It also discusses advantages and disadvantages of using mechanical MC-ASD versus VFDs and it provides field experience with VFDs in refrigerated warehouses as well as the fixed magnet MC-ASD in wastewater and other field applications. Laboratory tests for a 50 hp fan retrofit showed electronic VFD savings at 62%, the MagnaDrive Coupling at 39% and PAYBACK Drive at 46%. At $0.06/kWh and list prices, the simple payback for the VFD is 2.4 years, the MagnaDrive is 4.6 years and the PAYBACK is 1.9 years. MagnaDrive has models from 25 to 500 hp while PAYBACK has models from 3 to 200 hp. Contractors to the Northwest Energy Efficiency Alliance have helped to install VFDs for about 300 evaporator fans in over two dozen refrigerated warehouses and to install fixed-magnet MC-ASDs in about 50 applications with about half of these controlling wastewater pumps. The Alliance has no particular field experience with the electcromagnetic coupling. The primary advantages of magnetically coupled adjustable speed drives (MC-ASD) over VFDs come from reduced maintenance, resistance to dirty environments, separation of load vibration from the motor, and less stringent requirements for precise shaft alignment. Field experience indicates reductions in noise and repairs from vibration loads, tolerance of poor electrical power quality, and ease of installation are often more important than energy savings. The MC-ASDs are being used where VFDs have not survived or are considered too complicated.

Anderson, K. J.; Chvala, W. D.

2003-05-01T23:59:59.000Z

50

Low-frequency variability of currents in the deepwater eastern Gulf of Mexico  

E-Print Network (OSTI)

Vertical structure of the low frequency horizontal currents at the northern edge of the Loop Current during eddy shedding events is observed using concurrent hydrographic, moored, and satellite altimetry data from 2005. Dynamic modes are calculated at three deep (~3000 m), full water-column moorings in the eastern Gulf of Mexico. Time-series of the barotropic and first two baroclinic modes are found using a least squares minimization that fits theoretically derived modes to observed moored velocity data. EOF analyses show that the majority of observed variance is explained by a surface-trapped mode that is highly coherent with the temporal amplitudes of the first baroclinic mode, and a lower, but significant percentage of variance is captured in bottom-intensified modes. Amplitudes of the second empirical mode indicate that currents are more coherent in the ocean interior approaching the Loop Current, as more variance is explained by this mode at the southernmost mooring near the Loop Current. A dynamic mode decomposition of the horizontal currents reveals that the barotropic and first baroclinic modes exhibit low frequency variability and eddy time scales of 10 40 days. Second baroclinic mode amplitudes show higher frequency variability and shorter time scales. A model utility test for the least squares fit of modeled to observed velocity shows that the second baroclinic mode is useful to the statistical model during 50 85 % of the mooring deployment, and is particularly necessary to the model when cyclonic features are present in the study area. The importance of the second baroclinic mode to the model increases significantly closer to the Loop Current. High-speed currents associated with the Loop Current and anticyclones stimulate a strong first baroclinic response, but the second baroclinic mode amplitudes are found to be similar in magnitude to the first baroclinic mode amplitudes at times. This happens episodically and could be an indication of higher order dynamics related to frontal eddies or Loop Current eddy shedding.

Cole, Kelly Lynne

2008-08-01T23:59:59.000Z

51

Variable Frequency Operations of an Offshore Wind Power Plant with HVDC-VSC: Preprint  

DOE Green Energy (OSTI)

In this paper, a constant Volt/Hz operation applied to the Type 1 wind turbine generator. Various control aspects of Type 1 generators at the plant level and at the turbine level will be investigated. Based on DOE study, wind power generation may reach 330 GW by 2030 at the level of penetration of 20% of the total energy production. From this amount of wind power, 54 GW of wind power will be generated at offshore wind power plants. The deployment of offshore wind power plants requires power transmission from the plant to the load center inland. Since this power transmission requires submarine cable, there is a need to use High-Voltage Direct Current (HVDC) transmission. Otherwise, if the power is transmitted via alternating current, the reactive power generated by the cable capacitance may cause an excessive over voltage in the middle of the transmission distance which requires unnecessary oversized cable voltage breakdown capability. The use of HVDC is usually required for transmission distance longer than 50 kilometers of submarine cables to be economical. The use of HVDC brings another advantage; it is capable of operating at variable frequency. The inland substation will be operated to 60 Hz synched with the grid, the offshore substation can be operated at variable frequency, thus allowing the wind power plant to be operated at constant Volt/Hz. In this paper, a constant Volt/Hz operation applied to the Type 1 wind turbine generator. Various control aspects of Type 1 generators at the plant level and at the turbine level will be investigated.

Gevorgian, V.; Singh, M.; Muljadi, E.

2011-12-01T23:59:59.000Z

52

ams2000.com Stepper Motor System Basics  

E-Print Network (OSTI)

. STEPPING MOTORS TYPES OF STEPPING MOTORS VARIABLE RELUCTANCE PERMANENT MAGNET HYBRID MOTOR WINDINGS motor with the magnetic field electronically switched to rotate the armature magnet around. A Stepping MOTORS There are basically three types of stepping motors; variable reluctance, permanent magnet

Bechtold, Jill

53

Transverse electric conductivity and dielectric permeability in quantum degenerate collisional plasma with variable collision frequency in Mermin's approach  

E-Print Network (OSTI)

Formulas for transverse conductance and dielectric permeability in quantum degenerate collisional plasma with arbitrary variable collision frequency in Mermin's approach are deduced. Frequency of collisions of particles depends arbitrarily on a wave vector. For this purpose the kinetic Shr\\"{o}dinger - Boltzmann equation with collision integral of relaxation type in momentum space is applied. The case of degenerate Fermi plasma is allocated and investigated. The special case of frequency of collisions proportional to the module of a wave vector is considered. The graphic analysis of the real and imaginary parts of dielectric function is made.

Latyshev, A V

2013-01-01T23:59:59.000Z

54

Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation  

SciTech Connect

An interconnected electric power system is a complex system that must be operated within a safe frequency range in order to reliably maintain the instantaneous balance between generation and load. This is accomplished by ensuring that adequate resources are available to respond to expected and unexpected imbalances and restoring frequency to its scheduled value in order to ensure uninterrupted electric service to customers. Electrical systems must be flexible enough to reliably operate under a variety of"change" scenarios. System planners and operators must understand how other parts of the system change in response to the initial change, and need tools to manage such changes to ensure reliable operation within the scheduled frequency range. This report presents a systematic approach to identifying metrics that are useful for operating and planning a reliable system with increased amounts of variable renewable generation which builds on existing industry practices for frequency control after unexpected loss of a large amount of generation. The report introduces a set of metrics or tools for measuring the adequacy of frequency response within an interconnection. Based on the concept of the frequency nadir, these metrics take advantage of new information gathering and processing capabilities that system operators are developing for wide-area situational awareness. Primary frequency response is the leading metric that will be used by this report to assess the adequacy of primary frequency control reserves necessary to ensure reliable operation. It measures what is needed to arrest frequency decline (i.e., to establish frequency nadir) at a frequency higher than the highest set point for under-frequency load shedding within an interconnection. These metrics can be used to guide the reliable operation of an interconnection under changing circumstances.

Eto, Joseph H.; Undrill, John; Mackin, Peter; Daschmans, Ron; Williams, Ben; Haney, Brian; Hunt, Randall; Ellis, Jeff; Illian, Howard; Martinez, Carlos; O' Malley, Mark; Coughlin, Katie; LaCommare, Kristina Hamachi

2010-12-20T23:59:59.000Z

55

Experimental Analysis of Variable Capacity Heat Pump Systems equipped with a liquid-cooled frequency inverter.  

E-Print Network (OSTI)

?? Using an inverter-driven compressor in variable capacity heat pump systems has a main drawback, which is the extra loss in the inverter. The present (more)

Ebraheem, Thair

2013-01-01T23:59:59.000Z

56

A Minimal Baroclinic Model for the Statistical Properties of Low-Frequency Variability  

Science Conference Proceedings (OSTI)

A recent analysis of atmospheric observations has shown evidence of bimodality in the statistical distribution of wave amplitude in the ultralong (zonal wavenumber group 24), low frequency (period >5 days). Similar analysis of the zonal wind and ...

R. Benzi; A. Speranza; A. Sutera

1986-12-01T23:59:59.000Z

57

High-Frequency Variability in Hurricane Power Dissipation and Its Relationship to Global Temperature  

Science Conference Proceedings (OSTI)

The power dissipation of Atlantic tropical cyclones has risen dramatically during the last decades and the increase is correlated with an increase in the underlying sea surface temperature (SST) at low (decadal) frequencies. Because of the large ...

James B. Elsner; Anastasios A. Tsonis; Thomas H. Jagger

2006-06-01T23:59:59.000Z

58

A Linear Model of Wintertime Low-Frequency Variability. Part I: Formulation and Forecast Skill  

Science Conference Proceedings (OSTI)

A linear inverse model (LIM) suitable for studies of atmospheric extratropical variability on longer than weekly timescales is constructed using observations of the past 30 years. Notably, it includes tropical diabatic heating as an evolving ...

Christopher R. Winkler; Matthew Newman; Prashant D. Sardeshmukh

2001-12-01T23:59:59.000Z

59

North Atlantic modeling of low-frequency variability in mode water formation  

E-Print Network (OSTI)

The generation of interannual and near-decadal variability in the formation of mode waters in the western North Atlantic is investigated in the realistic framework of an isopycnic coordinate ocean model forced with atmospheric data from 1946 to 1988. At Bermuda, the model reproduces quite well the observed potential vorticity and isopycnal depth anomalies associated with the subtropical mode water (STMW). Heat storage and preconditioning of the convective activity are found to be the important factors for the generation of STMW variability, with persistence of cold (warm) conditions, associated with anomalous heat loss (gain) over the western subtropics, being more significant for the generation of the simulated variability than are strong anomalous events in isolated years. In the Labrador Sea, the model captures the phase and order of magnitude of the observed near-decadal variability in the convective activity, if not its maximum amplitude. The simulated potential vorticity anomali...

Afonso M. Paiva; Eric P. Chassignet

2001-01-01T23:59:59.000Z

60

Dynamical Origin of Low-Frequency Variability in a Highly Nonlinear Midlatitude Coupled Model  

Science Conference Proceedings (OSTI)

A novel mechanism of decadal midlatitude coupled variability, which crucially depends on the nonlinear dynamics of both the atmosphere and the ocean, is presented. The coupled model studied involves quasigeostrophic atmospheric and oceanic ...

S. Kravtsov; P. Berloff; W. K. Dewar; M. Ghil; J. C. McWilliams

2006-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Method for assessing motor insulation on operating motors  

DOE Patents (OSTI)

A method for monitoring the condition of electrical-motor-driven devices. The method is achieved by monitoring electrical variables associated with the functioning of an operating motor, applying these electrical variables to a three phase equivalent circuit and determining non-symmetrical faults in the operating motor based upon symmetrical components analysis techniques.

Kueck, John D. (Oak Ridge, TN); Otaduy, Pedro J. (Oak Ridge, TN)

1997-01-01T23:59:59.000Z

62

Method for assessing motor insulation on operating motors  

DOE Patents (OSTI)

A method for monitoring the condition of electrical-motor-driven devices is disclosed. The method is achieved by monitoring electrical variables associated with the functioning of an operating motor, applying these electrical variables to a three phase equivalent circuit and determining non-symmetrical faults in the operating motor based upon symmetrical components analysis techniques. 15 figs.

Kueck, J.D.; Otaduy, P.J.

1997-03-18T23:59:59.000Z

63

Evaporation-Wind Feedback and Low-Frequency Variability in the Tropical Atmosphere  

Science Conference Proceedings (OSTI)

A mechanism by which feedback between zonal wind perturbations and evaporation can create unstable, low-frequency modes in a simple two-layer model of the tropical troposphere is presented. The modes resemble the 3050 day oscillation. A series ...

J. David Neelin; Isaac M. Held; Kerry H. Cook

1987-08-01T23:59:59.000Z

64

Summer Severe-Rainfall Frequency Trend and Variability over Ontario, Canada  

Science Conference Proceedings (OSTI)

During the last two decades (19792002), there has been an ever-increasing frequency of summer severe-rainfall events over Ontario, Canada. This observed upward trend is robust as demonstrated through the MannKendall test with consideration of ...

Zuohao Cao; Jianmin Ma

2009-09-01T23:59:59.000Z

65

Ocean Model Diagnosis of Low-Frequency Climate Variability in the South Atlantic Region  

Science Conference Proceedings (OSTI)

South Atlantic Ocean variability is investigated by means of an ocean general circulation model (ORCA2), forced with the NCEPNCAR reanalyses for the 194899 period. A rotated EOF analysis of the mixed layer temperature suggests a breakdown of ...

Frank Colberg; C. J. C. Reason

2007-03-01T23:59:59.000Z

66

The Ocean Response to Low-Frequency Interannual Atmospheric Variability in the Mediterranean Sea. Part I: Sensitivity Experiments and Energy Analysis  

Science Conference Proceedings (OSTI)

In this study a general circulation model is used in order to investigate the interannual response of the Mediterranean Basin to low-frequency interannual variability in atmospheric forcing for the period 198088. The model incorporates a ...

G. Korres; N. Pinardi; A. Lascaratos

2000-02-01T23:59:59.000Z

67

The Influence of Midlatitude OceanAtmosphere Coupling on the Low-Frequency Variability of a GCM. Part I: No Tropical SST Forcing  

Science Conference Proceedings (OSTI)

This study examines the extent to which the thermodynamic interactions between the midlatitude atmosphere and the underlying oceanic mixed layer contribute to the low-frequency atmospheric variability. A general circulation model, run under ...

Ileana Blad

1997-08-01T23:59:59.000Z

68

A Qualitatively Realistic Low-Order Model of the Extratropical Low-Frequency Variability Built from Long Records of Potential Vorticity  

Science Conference Proceedings (OSTI)

A low-order deterministic qualitative model is formulated in order to simulate extratropical low-frequency variability. This deterministic model is based on a filtering of the potential vorticity equation on the 315-K isentrope and a projection ...

Eduardo Da Costa; Robert Vautard

1997-04-01T23:59:59.000Z

69

Development of Ulta-Efficient Electric Motors  

SciTech Connect

Electric motors utilize a large amount of electrical energy in utility and industrial applications. Electric motors constructed with high temperature superconducting (HTS) materials have the potential to dramatically reduce electric motor size and losses. HTS motors are best suited for large motor applications at ratings above 1000 horsepower (hp), where the energy savings from the efficiency improvement can overcome the additional power required to keep the superconductors on the rotor cooled. Large HTS based motors are expected to be half the volume and have half the losses of conventional induction motors of the same rating. For a 5000 hp industrial motor, this energy savings can result in $50,000 in operating cost savings over the course of a single year of operation. Since large horsepower motors utilize (or convert) about 30% of the electrical power generated in the United States and about 70% of large motors are candidates for replacement by HTS motors, the annual energy savings potential through the utilization of HTS motors can be up to $1 Billion in the United States alone. Research in the application of HTS materials to electric motors has lead to a number of HTS motor prototypes yet no industrial HTS motor product has yet been introduced. These motor demonstrations have been synchronous motors with HTS field windings, on the rotor. Figure 1-1 shows a solid model rendering of this type of motor. The rotor winding is made with HTS coils that are held at cryogenic temperature by introducing cooling fluid from the cryocooler to the rotor through a transfer coupling. The stator winding is made of copper wire. The HTS winding is thermally isolated from the warm armature and motor shafts by a vacuum insulation space and through the use of composite torque tubes. The stator in Figure 1-1 is an air core stator in that the stator teeth and a small part of the yoke is made up of nonmagnetic material so the magnetic fields distribute themselves as if in air. Between the HTS field winding and the physical air gap is a series of concentric cylinders that act as vacuum insulation space walls as well as conducting paths for induced currents to flow in order to shield the HTS winding and the rotor cold space from time dependent fields. These time dependent fields may be caused by rotor hunting, during a change in motor load, or by non-fundamental component voltages and currents applied by the inverter. These motors are variable speed controlled by the inverter. Common large motor utility and industrial applications are pump and fan drives that are best suited by a variable speed motor. Inverter control of the HTS motor eliminates the need to design the rotor for line starting, which would dump a large amount of heat into the rotor that would then heavily tax the cryogenic cooling system. The field winding is fed by a brushless exciter that provides DC current to the HTS rotor winding. The stator winding is air or water cooled. Technical and commercial hurdles to industrial HTS motor product introduction and customer acceptance include (1) the high cost of HTS wire and the cryogenic cooling system components, (2) customer concerns about reliability of HTS motors, and (3) the ability to attain the loss reduction potential of large HTS motors. Reliance Electric has demonstrated a number of HTS based electric motors up to a 1000 hp, variable speed synchronous motor with an HTS field winding in the year 2000. In 2001 this motor was tested to 1600 hp with a sinusoidal (constant frequency) supply. Figure 1-2 shows the HTS motor on the dynamometer test stand in the Reliance Electric test lab. The extensive test program of the 1000 hp motor successfully demonstrated the technical feasibility of large HTS motors and the basic technologies involved, however the test results did indicate the need for design refinements. In addition, test results served to identify other more fundamental critical technology issues, and revealed the need to continue research efforts in order to improve future HTS motor first cost, reliability, and performa

Shoykhet, B. (Baldor Comp.); Schiferl, R. (Baldor Comp.); Duckworth, R.; Rey, C.M.; Schwenterly, S.W.; Gouge, M.J.

2008-05-01T23:59:59.000Z

70

Transverse electric conductivity and dielectric permeability in quantum non-degenerate and maxwellian collisional plasma with variable collision frequency in Mermin's approach  

E-Print Network (OSTI)

Formulas for transverse conductance and dielectric permeability in quantum non-degenerate and Maxwellian collisional plasma with arbitrary variable collision frequency in Mermin's approach are deduced. Frequency of collisions of particles depends arbitrarily on a wave vector. The special case of frequency of collisions proportional to the module of a wave vector is considered. The graphic analysis of the real and imaginary parts of dielectric function is made.

Latyshev, A V

2013-01-01T23:59:59.000Z

71

Energy Efficient Motors  

E-Print Network (OSTI)

Efficiency is only one aspect of motor performance. This paper discusses how efficiency is influenced by such factors as horsepower rating, poles, actual load, and starting requirements. It discusses some of the variables affecting efficiency, and how to interpret efficiency data. A perspective is given from which to evaluate available energy efficient motor offerings for a given application.

Hoffmeyer, W.

1982-01-01T23:59:59.000Z

72

Stepping motor controller  

SciTech Connect

A stepping motor is microprocessingly controlled by digital circuitry which monitors the output of a shaft encoder adjustably secured to the stepping motor and generates a subsequent stepping pulse only after the preceding step has occurred and a fixed delay has expired. The fixed delay is variable on a real-time basis to provide for smooth and controlled deceleration.

Bourret, Steven C. (Los Alamos, NM); Swansen, James E. (Los Alamos, NM)

1984-01-01T23:59:59.000Z

73

Stepping motor controller  

DOE Patents (OSTI)

A stepping motor is microprocessor controlled by digital circuitry which monitors the output of a shaft encoder adjustably secured to the stepping motor and generates a subsequent stepping pulse only after the preceding step has occurred and a fixed delay has expired. The fixed delay is variable on a real-time basis to provide for smooth and controlled deceleration.

Bourret, S.C.; Swansen, J.E.

1982-07-02T23:59:59.000Z

74

Doubly Salient Permanent Magnet Motor Development Review  

Science Conference Proceedings (OSTI)

The research of doubly salient permanent magnet motor (DSPM), arises as the emergence of a novel type mechatronic control of AC drive system. Currently, on the international realm, the studies regarding on this kind of motor mainly focus on calculation ... Keywords: Doubly Salient, Permanent Magnet Motor, AC Variable Speed, Magnetic Materials, Switched Reluctance Motor

Lina Yi, Meng Zhao

2013-09-01T23:59:59.000Z

75

Motor current signature analysis method for diagnosing motor operated devices  

DOE Patents (OSTI)

A motor current noise signature analysis method and apparatus for remotely monitoring the operating characteristics of an electric motor-operated device such as a motor-operated valve. Frequency domain signal analysis techniques are applied to a conditioned motor current signal to distinctly identify various operating parameters of the motor driven device from the motor current signature. The signature may be recorded and compared with subsequent signatures to detect operating abnormalities and degradation of the device. This diagnostic method does not require special equipment to be installed on the motor-operated device, and the current sensing may be performed at remote control locations, e.g., where the motor-operated devices are used in accessible or hostile environments.

Haynes, Howard D. (Kingston, TN); Eissenberg, David M. (Oak Ridge, TN)

1990-01-01T23:59:59.000Z

76

Comparison on control strategies of the grid-side converter of variable speed constant frequency doubly-fed wind power generation system  

Science Conference Proceedings (OSTI)

Direct power control, vector control based on d-q synchronous rotating reference frame and ?-? static reference frame for the grid-side converter of variable speed constant frequency doubly-fed wind turbines are analyzed. System simulation ... Keywords: ?-? static reference frame, d-q rotating reference frame, direct power control, doubly-fed wind power generation system, grid-side converter

Xian-Ming Zhou; Ting-Long Pan; Zhi-Cheng Ji

2009-06-01T23:59:59.000Z

77

Low-Frequency Variability, Coherence Resonance, and Phase Selection in a Low-Order Model of the Wind-Driven Ocean Circulation  

Science Conference Proceedings (OSTI)

In this paper, a low-order spectral quasigeostrophic (QG) model of the wind-driven ocean circulation is derived and used to analyze the low-order character of the intrinsic low-frequency variability of the midlatitude double-gyre ocean circulation ...

Stefano Pierini

2011-09-01T23:59:59.000Z

78

FPGA Implementation of Space Vector PWM Technique for Voltage Source Inverter Fed Induction Motor Drive  

Science Conference Proceedings (OSTI)

This paper presents implementation of Space Vector Pulse Width Modulation (SVPWM) technique for three phase Voltage Source Inverter (VSI) using Field Programmable Gate Array (FPGA). Variable voltage and frequency supply to ac drives is invariably obtained ... Keywords: VSI, SVPWM, FPGA, Induction Motor

R. Rajendran; N. Devarajan

2009-12-01T23:59:59.000Z

79

Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation  

E-Print Network (OSTI)

Integration of Variable Renewable Generation The report isISO (CAISO). 2007. Integration of Renewable Resources.recommendations for integrating renewable resources on the

Eto, Joseph H.

2011-01-01T23:59:59.000Z

80

Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation  

E-Print Network (OSTI)

nations mix of generation sources changes. The potentiallarge conventional generation sources can be used as a toolVariable Renewable Generation Source: Undrill (2010) Figure

Eto, Joseph H.

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

System and method for motor speed estimation of an electric motor  

DOE Patents (OSTI)

A system and method for a motor management system includes a computer readable storage medium and a processing unit. The processing unit configured to determine a voltage value of a voltage input to an alternating current (AC) motor, determine a frequency value of at least one of a voltage input and a current input to the AC motor, determine a load value from the AC motor, and access a set of motor nameplate data, where the set of motor nameplate data includes a rated power, a rated speed, a rated frequency, and a rated voltage of the AC motor. The processing unit is also configured to estimate a motor speed based on the voltage value, the frequency value, the load value, and the set of nameplate data and also store the motor speed on the computer readable storage medium.

Lu, Bin (Kenosha, WI); Yan, Ting (Brookfield, WI); Luebke, Charles John (Sussex, WI); Sharma, Santosh Kumar (Viman Nagar, IN)

2012-06-19T23:59:59.000Z

82

Climate Variability and the Frequency of Extreme Temperature Events for Nine Sites across Canada: Implications for Power Usage  

Science Conference Proceedings (OSTI)

To study the impact of incremental climatic warming on summer extreme temperature event frequency, the historical record of daily maximum June, July, and August temperatures was analyzed for nine sites across Canada. It was found that all of ...

Andrew F. Colombo; David Etkin; Bryan W. Karney

1999-08-01T23:59:59.000Z

83

Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation  

E-Print Network (OSTI)

control because the industry assumed that power system operationsPower system operations planners conduct extensive studies to assess whether primary frequency controlcontrol is a fundamental requirement for reliable operation of any power system.

Eto, Joseph H.

2011-01-01T23:59:59.000Z

84

Power links with Ireland -- Excitation of turbine-generator shaft torsional vibrations by variable frequency currents superimposed on DC currents in asynchronous HVDC links  

Science Conference Proceedings (OSTI)

The paper describes an in-depth analysis of excitation of shaft torsional vibrations in steam-turbine-generator-exciter shafts in close proximity to HVDC converter stations by variable-frequency ripple currents superimposed on the DC currents in asynchronous Links. It extends earlier work to include an in depth analysis of system scaling factors for harmonic currents impressed on generators in Northern Ireland by an inverter and to investigate the phenomena for possible torsional vibrations in the generators by the Link. Frequencies at which shaft torsional vibrations would be excited by modulation product harmonics in 50Hz/50Hz asynchronous Links as a function of deviation in system frequency is reviewed. Relative noncharacteristic current levels for 50Hz/50Hz connectors are illustrated assuming ripple currents at the inverter which gives realistic harmonic voltages in a twelve-pulse bridge. The paper then shows that torques in machines in multi-machine networks may be estimated by proportioning HVDC link harmonic disturbance current appropriately to each machine at risk. It is concluded that variable-frequency ripple currents superimposed on the DC current in asynchronous links can excite sympathetic torsional vibrations in turbine-generator-exciter shafts.

Hammons, T.J.; Tay, B.W.; Kok, K.L. [Glasgow Univ. (United Kingdom)

1995-08-01T23:59:59.000Z

85

Low-Frequency Variability of the Equatorial Pacific Ocean Using a New Pseudostress Dataset: 19301989  

Science Conference Proceedings (OSTI)

Interannual and interdecadal variability of the equatorial Pacific are examined using a new pseudostress dataset. The monthly mean pseudostress fields (193089)are derived from Comprehensive Ocean-Atmosphere Data Set (COADS) pseudostresses using ...

Jay F. Shriver; James J. O'Brien

1995-11-01T23:59:59.000Z

86

Seasonal and Low-Frequency Variability of the Meridional Heat Flux at 36N in the North Atlantic  

Science Conference Proceedings (OSTI)

Historical hydrographic sections are used to investigate the seasonal and interannual variability in the meridional heat flux at 36N in the North Atlantic. The data consist of ten transatlantic sections and sections from four sectors, which ...

Olga T. Sato; T. Rossby

2000-03-01T23:59:59.000Z

87

IEMDC -IN-LINE ELECTRIC MOTOR DRIVEN COMPRESSOR  

SciTech Connect

Dresser-Rand completed the preliminary aerodynamic flowpath of the volute and inlet design for the compressor section. This has resulted in considerable progress being made on the development of the compressor section and ultimately towards the successful integration of the IEMDC System design. Significant effort was put forth in the design of aerodynamic components which resulted in a design that meets the limits of aerodynamically induced radial forces previously established. Substantial effort has begun on the mechanical design of the compressor pressure containing case and other internal components. These efforts show progression towards the successful integration of a centrifugal compressor and variable speed electric motor ventilated by the process gas. All efforts continue to confirm the feasibility of the IEMDC system design. During the third quarter reporting period, the focus was to further refine the motor design and to ensure that the IEMDC rotor system supported on magnetic bearing is in compliance with the critical speed and vibration requirements of the API standards 617 and 541. Consequently specification to design magnetic bearings was developed and an RFQ to three magnetic bearing suppliers was issued. Considerable work was also performed to complete preliminary reports on some of the deliverable tasks under phase 1.0. These include specification for the VFD, RFQ for the magnetic bearings, and preliminary write-up for motor instrumentation and control schematic. In order to estimate motor efficiency at various operating points, plots of calculated motor losses, and motor cooling gas flow rates were also prepared. Preliminary evaluations of motor support concepts were performed via FEA to determine modal frequencies. Presentation was made at DOE Morgantown on August 12, 2003 to provide project status update. Preparations for the IEMDC motor-compressor presentation, at the GMRC conference in Salt Lake City to be held on October 5, 2003, were also started. Detailed calculations of cooling gas flow requirements for the motor and magnetic bearings, per several new operating points designated by DR, confirmed that the required gas flow was within the compressor design guidelines. Previous thrust load calculations had confirmed that the magnetic thrust bearing design load capacity of 6,000 lb. was sufficient to handle the net thrust load produced by the motor and compressor pressure loading. Thus the design data that has been generated, for the variable speed 10 MW 12,000 rpm motor, during the last three quarters, continue to confirm the feasibility of an efficient and robust motor design.

Michael J. Crowley; Prem N. Bansal; John E. Tessaro

2004-01-01T23:59:59.000Z

88

Ultra-Efficient and Power Dense Electric Motors for U. S. Industry  

SciTech Connect

The primary purpose of this project was to combine the ease-of-installation and ease-of-use attributes of industrial induction motors with the low-loss and small size and weight advantages of PM motors to create an ultra-efficient, high power density industrial motor that can be started across-the-line or operated from a standard, Volts/Hertz drive without the need for a rotor position feedback device. PM motor products that are currently available are largely variable speed motors that require a special adjustable speed drive with rotor position feedback. The reduced size and weight helps to offset the magnet cost in order make these motors commercially viable. The scope of this project covers horsepower ratings from 20 ? 500. Prototypes were built and tested at ratings ranging from 30 to 250 HP. Since fans, pumps and compressors make up a large portion of industrial motor applications, the motor characteristics are tailored to those applications. Also, since there is extensive use of adjustable frequency inverters in these applications, there is the opportunity to design for an optimal pole number and operate at other than 60 Hz frequency when inverters are utilized. Designs with four and eight pole configurations were prototyped as part of this work. Four pole motors are the most commonly used configuration in induction motors today. The results of the prototype design, fabrication, and testing were quite successful. The 50 HP rating met all of the design goals including efficiency and power density. Tested values of motor losses at 50 HP were 30% lower than energy efficient induction motors and the motor weight is 35% lower than the energy efficient induction motor of the same rating. Further, when tested at the 30 HP rating that is normally built in this 286T frame size, the efficiency far exceeds the project design goals with 30 HP efficiency levels indicating a 55% reduction in loss compared to energy efficient motors with a motor weight that is a few percentage points lower than the energy efficient motor. This 30 HP rating full load efficiency corresponds to a 46% reduction in loss compared to a 30 HP NEMA Premium? efficient motor. The cost goals were to provide a two year or shorter efficiency-based payback of a price premium associated with the magnet cost in these motors. That goal is based on 24/7 operation with a cost of electricity of 10 cents per kW-hr. Similarly, the 250 HP prototype efficiency testing was quite successful. In this case, the efficiency was maximized with a slightly less aggressive reduction in active material. The measured full load efficiency of 97.6% represents in excess of a 50% loss reduction compared to the equivalent NEMA Premium Efficiency induction motor. The active material weight reduction was a respectable 14.5% figure. This larger rating demonstrated both the scalability of this technology and also the ability to flexibly trade off power density and efficiency. In terms of starting performance, the 30 ? 50 HP prototypes were very extensively tested. The demonstrated capability included the ability to successfully start a load with an inertia of 25 times the motor?s own inertia while accelerating against a load torque following a fan profile at the motor?s full nameplate power rating. This capability will provide very wide applicability of this motor technology. The 250 HP prototype was also tested for starting characteristics, though without a coupled inertia and load torque. As a result it was not definitively proven that the same 25 times the motor?s own inertia could be started and synchronized successfully at 250 HP. Finite element modeling implies that this load could be successfully started, but it has not yet been confirmed by a test.

Melfi, Michael J.; Schiferl, Richard F.; Umans, Stephen D.

2013-03-12T23:59:59.000Z

89

Longitudinal electric conductivity and dielectric permeability in quantum plasma with variable frequency of collisions in Mermin' approach  

E-Print Network (OSTI)

Formulas for longitudinal electric conductivity and dielectric permeability in the quantum non-degenerate collisional plasma with the frequency of collisions depending on momentum in Mermin' approach are received. The kinetic equation in momentum space in relaxation approximation is used. It is shown that when Planck's constant tends to zero, the deduced formula passes to the corresponding formula for classical plasma. It is shown also that when frequency of collisions of particles of plasma tends to zero (plasma passes to collisionless one), the deduced formula passes to the known Lindhard' formula received for collisionless plasmas. It is shown, that when frequency of collisions is a constant, the deduced formula for dielectric permeability passes in known Mermin' formula.

A. V. Latyshev; A. A. Yushkanov

2012-12-22T23:59:59.000Z

90

Longitudinal electric conductivity and dielectric permeability in quantum plasma with variable frequency of collisions in Mermin' approach  

E-Print Network (OSTI)

Formulas for longitudinal electric conductivity and dielectric permeability in the quantum non-degenerate collisional plasma with the frequency of collisions depending on momentum in Mermin' approach are received. The kinetic equation in momentum space in relaxation approximation is used. It is shown that when Planck's constant tends to zero, the deduced formula passes to the corresponding formula for classical plasma. It is shown also that when frequency of collisions of particles of plasma tends to zero (plasma passes to collisionless one), the deduced formula passes to the known Lindhard' formula received for collisionless plasmas. It is shown, that when frequency of collisions is a constant, the deduced formula for dielectric permeability passes in known Mermin' formula.

Latyshev, A V

2012-01-01T23:59:59.000Z

91

A Detailed Analysis of the Nonlinear Dynamics of the Electric Step Motor J. Reiss, F. Alin*  

E-Print Network (OSTI)

responsible for the torque, motors can be classified as variable reluctance motors, permanent magnet motors magnet on the rotor. In this case, the torque is due to the variable resistance. Permanent magnet motorsA Detailed Analysis of the Nonlinear Dynamics of the Electric Step Motor J. Reiss, F. Alin* , M

Reiss, Josh

92

Time-Frequency Analysis of GALLEX and GNO Solar Neutrino Data: Evidence Suggestive of Asymmetric and Variable Nuclear Burning  

E-Print Network (OSTI)

Time-frequency analysis of data from the GALLEX and GNO solar neutrino experiments shows that some features in power-spectrum analyses of those datasets are due to aliasing. We normalize data for each of the four experiments in the GALLEX series, concatenate the resulting normalized data, and then form time-frequency displays. We also form time-frequency displays of the two principal modulations found in the data, at 11.87 yr-1 and at 13.63 yr-1, and of the datasets formed by subtracting these modulations from the actual (normalized) data. The results suggest that the true modulation is that at 11.87 yr-1, consistent with the results of our earlier analysis of Homestake solar neutrino data. Comparison with helioseismology data indicates that modulation is occurring either in the radiative zone just below the tachocline, presumably by the RSFP (resonant spin-flavor precession) process, or in the core, presumably due to inhomogeneities and fluctuations in the nuclear-burning process.

P. A. Sturrock

2008-02-22T23:59:59.000Z

93

Fourier decomposition and frequency analysis of the pulsating stars with PRRc and RRab variables. Separation criteria and particularities  

E-Print Network (OSTI)

The OGLE database is revisited to investigate in more detail the properties of the Fourier parameters. Methodological improvements led us to identify a clear separation among High-Amplitude Delta Scuti (HADS), RRc and RRab stars. The bimodal distribution of the R21 parameter in HADS stars is explained as a contamination effect from RRc stars: there is evidence that all stars with 0.20RRc variables. The previously claimed existence of a subclass of unusual HADS is demonstrated to be a spurious result. Candidate overtone pulsators are found among HADS and RRc variables. The properties of the Fourier parameters are discussed as a function of the physical conditions in the stars involved. Among the field RRab stars we detected different light-curve groups producing distinct "tails" in the Fourier plots for P>0.55 d; evolutionary phases or the combination of different physical conditions (not only metallicity) are suggested to explain this separation, observed also in the cluster RRab stars. The stellar parameters of RRc stars in a given globular cluster show different tendencies than those of RRc stars from different clusters.

Ennio Poretti

2001-03-29T23:59:59.000Z

94

Stressing of turbine-generator-exciter shafts by variable-frequency currents superimposed on DC currents in asynchronous HVDC links and following disturbances at converter stations  

SciTech Connect

Ripple currents on the DC side of both HVDC synchronous and asynchronous. Links together with cleared HVDC and AC system disturbances can excite in some circumstances onerous torsional vibrations in large steam generator shafts. The problem has assumed importance in recent months on account of the HVDC Link between Scotland and Northern Ireland going ahead, on account of the proposed Eire/Wales Link, and because AC/DC/AC couplers are to be installed extensively to interconnect the East and West European Grid Systems. This paper discusses and analyses excitation of shaft torsional vibrations in steam turbine-generator-exciter shafts in close proximity to HVDC converter stations by (1) variable-frequency ripple currents superimposed on the DC currents in asynchronous Links, and (2) disturbances at bi-polar converter stations. The time response and tables show that for the systems studied variable-frequency ripple currents superimposed on the DC current in asynchronous Links can excite shaft torsional vibrations, the very small noncharacteristic currents could result in onerous shaft torques which might damage the machine, and that DC line faults at converter stations in close proximity of steam turbine-generator units can excite onerous turbine-generator shaft torsional response. Detailed simulation of the HVDC converter and generator is necessary for precise assessments of shaft torsional response following HVDC converter station faults. 500MW, 660MW, 1000MW and 1300MW machines are considered in the analyses that are made.

Hammons, T.J.; Bremner, J.J. (Univ. of Glasgow (United Kingdom))

1994-09-01T23:59:59.000Z

95

Demodulation circuit for AC motor current spectral analysis  

DOE Patents (OSTI)

A motor current analysis method for the remote, noninvasive inspection of electric motor-operated systems. Synchronous amplitude demodulation and phase demodulation circuits are used singly and in combination along with a frequency analyzer to produce improved spectral analysis of load-induced frequencies present in the electric current flowing in a motor-driven system.

Hendrix, Donald E. (Oak Ridge, TN); Smith, Stephen F. (Knoxville, TN)

1990-12-18T23:59:59.000Z

96

State observer for synchronous motors  

DOE Patents (OSTI)

A state observer driven by measurements of phase voltages and currents for estimating the angular orientation of a rotor of a synchronous motor such as a variable reluctance motor (VRM). Phase voltages and currents are detected and serve as inputs to a state observer. The state observer includes a mathematical model of the electromechanical operation of the synchronous motor. The characteristics of the state observer are selected so that the observer estimates converge to the actual rotor angular orientation and velocity, winding phase flux linkages or currents.

Lang, Jeffrey H. (Waltham, MA)

1994-03-22T23:59:59.000Z

97

Motor current signature analysis method for diagnosing motor-operated devices  

DOE Patents (OSTI)

A motor current noise signature analysis method for remotely monitoring the operating characteristics of an electric motor-operated device such as a motor-operated valve. Frequency domain signal analysis techniques are applied to a conditioned motor current signal to distinctly identify various operating parameters of the motor driven device from the motor current signature. The signature may be recorded and compared with subsequent signatures to detect operating abnormalities and degradation of the device. This diagnostic method does not require special equipment to be installed on the motor-operated device, and the current sensing may be performed at remote control locations, e.g., where the motor-operated devices are used in inaccessible or hostile environments. 6 figs.

Haynes, H.D.; Eissenberg, D.M.

1986-09-30T23:59:59.000Z

98

TFTR Motor Generator  

SciTech Connect

A general description is given of 475 MVA pulsed motor generators for TFTR at Princeton Plasma Physics Laboratory. Two identical generators operating in parallel are capable of supplying 950 MVA for an equivalent square pulse of 6.77 seconds and 4,500 MJ at 0.7 power factor to provide the energy for the pulsed electrical coils and heating system for TFTR. The description includes the operational features of the 15,000 HP wound rotor motors driving each generator with its starting equipment and cycloconverter for controlling speed, power factor, and regulating line voltage during load pulsing where the generator speed changes from 87.5 to 60 Hz frequency variation to provide the 4,500 MJ or energy. The special design characteristics such as fatigue stress calculations for 10/sup 6/ cycles of operation, forcing factor on exciter to provide regulation, and low generator impedance are reviewed.

Murray, J.G.; Bronner, G.; Horton, M.

1977-01-01T23:59:59.000Z

99

Analysis of variable-frequency currents superimposed on DC currents in asynchronous HVDC Links in stressing turbine-generator-exciter shafts  

Science Conference Proceedings (OSTI)

Ripple currents on the DC side of both HVDC asynchronous and synchronous Links can excite in some circumstances onerous torsional vibrations in large steam generator shafts. The problem has assumed importance in recent months on account of the HVDC Link between Scotland and Northern Ireland going ahead, on account of the proposed Eire/Wales Link, because AC/DC/AC couplers are to be installed to interconnect the East and West European Grid Systems, and because resonances have been observed on machines in close proximity to AC/DCIAC couplers and HVDC Links. This paper discusses and analyses excitation of shaft torsional vibrations in steam turbine-generator-exciter shafts in close proximity to HVDC converter stations by variable-frequency ripple currents superimposed on DC currents in asynchronous Links. It presents technical knowledge not arranged for convenient reference heretofore in studying possible excitation of turbine-generator-v/ exciter shaft torsional vibrations by non-characteristic HVDC converter harmonic currents if a machine should be considered to be at risk. Shaft torques in multi-machine networks are evaluated by proportioning HVDC Link disturbance currents to each machine at risk using system network data, generator data and fault analysis data considering frequency dependence of the system parameters. This scaling factor is calculated for different scenarios of system operation and load. Equivalent circuits for the synchronous generator are employed appropriately to correlate HVDC Link disturbance current impressed on the generator stator with s state torque excitation from which magnitude of turbine-generator-exciter shaft torque is deduced.

Hammons, T.J.; Bremner, J.J. [Univ. of Glasgow (United Kingdom)

1995-03-01T23:59:59.000Z

100

Advanced Motors  

SciTech Connect

Project Summary Transportation energy usage is predicted to increase substantially by 2020. Hybrid vehicles and fuel cell powered vehicles are destined to become more prominent as fuel prices rise with the demand. Hybrid and fuel cell vehicle platforms are both dependent on high performance electric motors. Electric motors for transportation duty will require sizeable low-speed torque to accelerate the vehicle. As motor speed increases, the torque requirement decreases which results in a nearly constant power motor output. Interior permanent magnet synchronous motors (IPMSM) are well suited for this duty. , , These rotor geometries are configured in straight lines and semi circular arc shapes. These designs are of limited configurations because of the lack of availability of permanent magnets of any other shapes at present. We propose to fabricate rotors via a novel processing approach where we start with magnet powders and compact them into a net shape rotor in a single step. Using this approach, widely different rotor designs can be implemented for efficiency. The current limitation on magnet shape and thickness will be eliminated. This is accomplished by co-filling magnet and soft iron powders at specified locations in intricate shapes using specially designed dies and automatic powder filling station. The process fundamentals for accomplishing occurred under a previous Applied Technology Program titled, ???????????????¢????????????????????????????????Motors and Generators for the 21st Century???????????????¢???????????????????????????????. New efficient motor designs that are not currently possible (or cost prohibitive) can be accomplished by this approach. Such an approach to motor fabrication opens up a new dimension in motor design. Feasibility Results We were able to optimize a IPMSM rotor to take advantage of the powder co-filling and DMC compaction processing methods. The minimum low speed torque requirement of 5 N-m can be met through an optimized design with magnet material having a Br capability of 0.2 T. This level of magnetic performance can be met with a variety of bonded magnet compositions. The torque ripple was found to drop significantly by using thinner magnet segments. The powder co-filling and subsequent compaction processing allow for thinner magnet structures to be formed. Torque ripple can be further reduced by using skewing and pole shaping techniques. The techniques can be incorporated into the rotor during the powder co-filling process.

Knoth, Edward A.; Chelluri, Bhanumathi; Schumaker, Edward J.

2012-12-14T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Submersible canned motor transfer pump  

DOE Patents (OSTI)

A transfer pump used in a waste tank for transferring high-level radioactive liquid waste from a waste tank and having a column assembly, a canned electric motor means, and an impeller assembly with an upper impeller and a lower impeller connected to a shaft of a rotor assembly. The column assembly locates a motor housing with the electric motor means adjacent to the impeller assembly which creates an hydraulic head, and which forces the liquid waste, into the motor housing to cool the electric motor means and to cool and/or lubricate the radial and thrust bearing assemblies. Hard-on-hard bearing surfaces of the bearing assemblies and a ring assembly between the upper impeller and electric motor means grind large particles in the liquid waste flow. Slots in the static bearing member of the radial bearing assemblies further grind down the solid waste particles so that only particles smaller than the clearances in the system can pass therethrough, thereby resisting damage to and the interruption of the operation of the transfer pump. The column assembly is modular so that sections can be easily assembled, disassembled and/or removed. A second embodiment employs a stator jacket which provides an alternate means for cooling the electric motor means and lubricating and/or cooling the bearing assemblies, and a third embodiment employs a variable level suction device which allows liquid waste to be drawn into the transfer pump from varying and discrete levels in the waste tank.

Guardiani, Richard F. (Ohio Township, Allegheny County, PA); Pollick, Richard D. (Sarver, PA); Nyilas, Charles P. (Monroeville, PA); Denmeade, Timothy J. (Lower Burrell, PA)

1997-01-01T23:59:59.000Z

102

Increasing the energetic efficiency in producing of electric and thermal power in thermal power plants by using of variable speed  

Science Conference Proceedings (OSTI)

In this work is presenting a theoretical analysis and an experimental application of the energetic efficiency increase by using of variable-speed AC electric drive systems in a thermal power plant that produces electric and thermal power. Are presented ... Keywords: asynchronous motor, district heating system, energetic efficiency, harmonic distorsion generated by adjustable speed drives, pumping station, static frequency converter, testing

Sorin Ioan Deaconu; Gabriel Nicolae Popa; Iosif Popa

2008-09-01T23:59:59.000Z

103

MotorMaster+ International  

NLE Websites -- All DOE Office Websites (Extended Search)

Motors with MotorMaster+ International * Are your plant motor systems running at optimal energy efficiency? * Do you know how to cost-effectively determine whether to repair or...

104

Relationships between Systematic Errors in Medium Range Numerical Forecasts and Some of the Principal Modes of Low-Frequency Variability of the Northern Hemisphere 700 mb Circulation  

Science Conference Proceedings (OSTI)

The relationship between the existence of low-frequency 700 mb height anomalies in the initial conditions of NMC's MRF global spectral model and subsequent 5-, 7-, and 10-day forecasts of 700 mb height from 1982 to 1988 is explored. Low-frequency ...

Edward A. O'Lenic; Robert E. Livezey

1989-06-01T23:59:59.000Z

105

Submersible canned motor transfer pump  

DOE Patents (OSTI)

A transfer pump is described which is used in a waste tank for transferring high-level radioactive liquid waste from a waste tank and having a column assembly, a canned electric motor means, and an impeller assembly with an upper impeller and a lower impeller connected to a shaft of a rotor assembly. The column assembly locates a motor housing with the electric motor means adjacent to the impeller assembly which creates an hydraulic head, and which forces the liquid waste, into the motor housing to cool the electric motor means and to cool and/or lubricate the radial and thrust bearing assemblies. Hard-on-hard bearing surfaces of the bearing assemblies and a ring assembly between the upper impeller and electric motor means grind large particles in the liquid waste flow. Slots in the static bearing member of the radial bearing assemblies further grind down the solid waste particles so that only particles smaller than the clearances in the system can pass there through, thereby resisting damage to and the interruption of the operation of the transfer pump. The column assembly is modular so that sections can be easily assembled, disassembled and/or removed. A second embodiment employs a stator jacket which provides an alternate means for cooling the electric motor means and lubricating and/or cooling the bearing assemblies, and a third embodiment employs a variable level suction device which allows liquid waste to be drawn into the transfer pump from varying and discrete levels in the waste tank. 17 figs.

Guardiani, R.F.; Pollick, R.D.; Nyilas, C.P.; Denmeade, T.J.

1997-08-19T23:59:59.000Z

106

A Novel MagPipe Pipeline transportation system using linear motor drives  

Science Conference Proceedings (OSTI)

A novel capsule pipeline transportation system using linear motor drives, called Magplane MagPipe, is under development with the intention to replace trucks and railways for hauling materials from the mine to the rail head, power plant, or processing plant with reduced operating cost and energy consumption. The initial demonstration of a MagPipe line in Inner Mongolia will be a 500-m-long double-pipe coal transport system with the design transportation capacity of 3 Mega-Mg per year. The pipeline consists of 6-m-long plastic pipe modules with an I-beam suspension system inside the pipe to carry sets of five coupled capsules. The pipe will also contain noncontinuous motor winding modules spaced at 50-m intervals. A set of Halbach-arrayed permanent magnets on the bottom of the capsules interact with the linear motor windings to provide propulsion. The motor is driven by variable frequency drives outside the pipe to control the speed. This paper briefly describes the overall MagPipe pipeline transportation system, including the preliminary conclusions of the linear synchronous motor analysis.

Fang, J.R.; Montgomery, D.B.; Roderick, L. [Magplane Technology Inc., Littleton, MA (United States)

2009-11-15T23:59:59.000Z

107

Piezoelectric wave motor  

DOE Patents (OSTI)

A piezoelectric motor having a stator in which piezoelectric elements are contained in slots formed in the stator transverse to the desired wave motion. When an electric field is imposed on the elements, deformation of the elements imposes a force perpendicular to the sides of the slot, deforming the stator. Appropriate frequency and phase shifting of the electric field will produce a wave in the stator and motion in a rotor. In a preferred aspect, the piezoelectric elements are configured so that deformation of the elements in direction of an imposed electric field, generally referred to as the d.sub.33 direction, is utilized to produce wave motion in the stator. In a further aspect, the elements are compressed into the slots so as to minimize tensile stresses on the elements in use.

Yerganian, Simon Scott (Lee' s Summit, MO)

2001-07-17T23:59:59.000Z

108

Piezoelectric wave motor  

DOE Patents (OSTI)

A piezoelectric motor having a stator in which piezoelectric elements are contained in slots formed in the stator transverse to the desired wave motion. When an electric field is imposed on the elements, deformation of the elements imposes a force perpendicular to the sides of the slot, deforming the stator. Appropriate frequency and phase-shifting of the electric field will produce a wave in the stator and motion in a rotor. In a preferred aspect, the piezoelectric elements are configured so that deformation of the elements in the direction of an imposed electric field, generally referred to as the d.sub.33 direction, is utilized to produce wave motion in the stator. In a further aspect, the elements are compressed into the slots so as to minimize tensile stresses on the elements in use.

Yerganian, Simon Scott (Lee' s Summit, MO)

2003-02-11T23:59:59.000Z

109

Low-Frequency Variability of Temperature in the Vicinity of the Equatorial Pacific Thermocline in SODA: Role of Equatorial Wave Dynamics and ENSO Asymmetry  

Science Conference Proceedings (OSTI)

The Simple Ocean Data Assimilation (SODA) reanalysis (19582001) is used to investigate the decadal variability in the equatorial thermocline in the Pacific. Whereas the thermocline depth exhibits weak variation at decadal time scales, the ...

B. Dewitte; S. Thual; S-W. Yeh; S-I. An; B-K. Moon; B. S. Giese

2009-11-01T23:59:59.000Z

110

Tecnologías del Motor  

NLE Websites -- All DOE Office Websites (Extended Search)

del Motor del Motor El Tiempo de apertura y Levantamiento de Válvulas Variable (VVT&L) Motor con Válvulas de Tiempo y Elevación Variable También llamado activación variable de válvulas (AVV), elevación variable y tiempo variable y control electrónico de elevación (VTEC®). Las válvulas controlan el flujo de aire y combustible de los cilindros y los expulsa fuera de ellos. El momento y el tiempo que las válvulas permanecen abiertas y cómo se mueven o se elevan, ambos afectan la eficiencia del motor. Los ajustes en el tiempo y elevación son diferentes para motores de baja y alta velocidad. De cualquier manera en los diseños tradicionales se usan tiempos y elevaciones "arregladas" lo cual compromete los valores óptimos entre las velocidades altas y bajas. Los sistemas VVT&L alteran el tiempo y

111

Motor torque compensation of an induction electric motor by ...  

Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature United States Patent

112

Instrument for analysis of electric motors based on slip-poles component  

DOE Patents (OSTI)

A new instrument for monitoring the condition and speed of an operating electric motor from a remote location. The slip-poles component is derived from a motor current signal. The magnitude of the slip-poles component provides the basis for a motor condition monitor, while the frequency of the slip-poles component provides the basis for a motor speed monitor. The result is a simple-to-understand motor health monitor in an easy-to-use package. Straightforward indications of motor speed, motor running current, motor condition (e.g., rotor bar condition) and synthesized motor sound (audible indication of motor condition) are provided. With the device, a relatively untrained worker can diagnose electric motors in the field without requiring the presence of a trained engineer or technician.

Haynes, Howard D. (Knoxville, TN); Ayers, Curtis W. (Clinton, TN); Casada, Donald A. (Knoxville, TN)

1996-01-01T23:59:59.000Z

113

Instrument for analysis of electric motors based on slip-poles component  

DOE Patents (OSTI)

A new instrument is described for monitoring the condition and speed of an operating electric motor from a remote location. The slip-poles component is derived from a motor current signal. The magnitude of the slip-poles component provides the basis for a motor condition monitor, while the frequency of the slip-poles component provides the basis for a motor speed monitor. The result is a simple-to-understand motor health monitor in an easy-to-use package. Straightforward indications of motor speed, motor running current, motor condition (e.g., rotor bar condition) and synthesized motor sound (audible indication of motor condition) are provided. With the device, a relatively untrained worker can diagnose electric motors in the field without requiring the presence of a trained engineer or technician. 4 figs.

Haynes, H.D.; Ayers, C.W.; Casada, D.A.

1996-11-26T23:59:59.000Z

114

Method and apparatus for generating motor current spectra to enhance motor system fault detection  

DOE Patents (OSTI)

A method and circuitry for sampling periodic amplitude modulations in a nonstationary periodic carrier wave to determine frequencies in the amplitude modulations. The method and circuit are described in terms of an improved motor current signature analysis. The method insures that the sampled data set contains an exact whole number of carrier wave cycles by defining the rate at which samples of motor current data are collected. The circuitry insures that a sampled data set containing stationary carrier waves is recreated from the analog motor current signal containing nonstationary carrier waves by conditioning the actual sampling rate to adjust with the frequency variations in the carrier wave. After the sampled data is transformed to the frequency domain via the Discrete Fourier Transform, the frequency distribution in the discrete spectra of those components due to the carrier wave and its harmonics will be minimized so that signals of interest are more easily analyzed.

Linehan, Daniel J. (Knoxville, TN); Bunch, Stanley L. (Oak Ridge, TN); Lyster, Carl T. (Knoxville, TN)

1995-01-01T23:59:59.000Z

115

Method and apparatus for generating motor current spectra to enhance motor system fault detection  

DOE Patents (OSTI)

A method and circuitry are disclosed for sampling periodic amplitude modulations in a nonstationary periodic carrier wave to determine frequencies in the amplitude modulations. The method and circuit are described in terms of an improved motor current signature analysis. The method insures that the sampled data set contains an exact whole number of carrier wave cycles by defining the rate at which samples of motor current data are collected. The circuitry insures that a sampled data set containing stationary carrier waves is recreated from the analog motor current signal containing nonstationary carrier waves by conditioning the actual sampling rate to adjust with the frequency variations in the carrier wave. After the sampled data is transformed to the frequency domain via the Discrete Fourier Transform, the frequency distribution in the discrete spectra of those components due to the carrier wave and its harmonics will be minimized so that signals of interest are more easily analyzed. 29 figs.

Linehan, D.J.; Bunch, S.L.; Lyster, C.T.

1995-10-24T23:59:59.000Z

116

Monitoring method and apparatus using high-frequency carrier ...  

A method and apparatus for monitoring an electrical-motor-driven device by injecting a high frequency carrier signal onto the power line current. The method is ...

117

Stepping Motor Control System  

E-Print Network (OSTI)

This paper describes a hardware system designed to facilitate position and velocity control of a group of eight stepping motors using a PDP-11. The system includes motor driver cards and other interface cards in addition ...

Larson, Noble G.

118

Quantum motor and future  

E-Print Network (OSTI)

In a popular language, the possibilities of the Casimir expulsion effect are presented, which can be the basis of quantum motors. Such motors can be in the form of a special multilayer thin film with periodic and complex nanosized structures. Quantum motors of the type of the Casimir platforms can be the base of transportation, energy and many other systems in the future.

Evgeny G. Fateev

2013-01-20T23:59:59.000Z

119

Quantum motor and future  

E-Print Network (OSTI)

In a popular language, the possibilities of the Casimir expulsion effect are presented, which can be the basis of quantum motors. Such motors can be in the form of a special multilayer thin film with periodic and complex nanosized structures. Quantum motors of the type of the Casimir platforms can be the base of transportation, energy and many other systems in the future.

Fateev, Evgeny G

2013-01-01T23:59:59.000Z

120

Motor/generator  

DOE Patents (OSTI)

A motor/generator is provided for connecting between a transmission input shaft and an output shaft of a prime mover. The motor/generator may include a motor/generator housing, a stator mounted to the motor/generator housing, a rotor mounted at least partially within the motor/generator housing and rotatable about a rotor rotation axis, and a transmission-shaft coupler drivingly coupled to the rotor. The transmission-shaft coupler may include a clamp, which may include a base attached to the rotor and a plurality of adjustable jaws.

Hickam, Christopher Dale (Glasford, IL)

2008-05-13T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Method and apparatus for improved efficiency in a pulse-width-modulated alternating current motor drive  

DOE Patents (OSTI)

A scheme for optimizing the efficiency of an AC motor drive operated in a pulse-width-modulated mode provides that the modulation frequency of the power furnished to the motor is a function of commanded motor torque and is higher at lower torque requirements than at higher torque requirements.

Konrad, Charles E. (Roanoke, VA); Boothe, Richard W. (Roanoke, VA)

1994-01-01T23:59:59.000Z

122

Method and apparatus for improved efficiency in a pulse-width-modulated alternating current motor drive  

DOE Patents (OSTI)

A scheme for optimizing the efficiency of an AC motor drive operated in a pulse-width-modulated mode provides that the modulation frequency of the power furnished to the motor is a function of commanded motor torque and is higher at lower torque requirements than at higher torque requirements.

Konrad, Charles E. (Roanoke, VA); Boothe, Richard W. (Roanoke, VA)

1996-01-01T23:59:59.000Z

123

Method and apparatus for improved efficiency in a pulse-width-modulated alternating current motor drive  

DOE Patents (OSTI)

A scheme for optimizing the efficiency of an AC motor drive operated in a pulse-width-modulated mode provides that the modulation frequency of the power furnished to the motor is a function of commanded motor torque and is higher at lower torque requirements than at higher torque requirements. 6 figures.

Konrad, C.E.; Boothe, R.W.

1994-02-15T23:59:59.000Z

124

Method and apparatus for improved efficiency in a pulse-width-modulated alternating current motor drive  

DOE Patents (OSTI)

A scheme for optimizing the efficiency of an AC motor drive operated in a pulse-width-modulated mode provides that the modulation frequency of the power furnished to the motor is a function of commanded motor torque and is higher at lower torque requirements than at higher torque requirements. 6 figs.

Konrad, C.E.; Boothe, R.W.

1996-01-23T23:59:59.000Z

125

Multi-winding Homopolar Electric Machine Offers Variable ...  

The device can be used as either a motor or a generator. Advantages Variable voltage and speed design Internal mechanism allowing for low speed, high

126

Parametric electric motor study  

DOE Green Energy (OSTI)

Technology for the axial gap motor was developed by DOE with an investment of approximately $15 million. This development effort is for motor technologies of high power density and high efficiency. Such motors that are also small and light-weight are not available on the commercial market because high-power motors have typically been used in large industrial applications where small size and light weight are not requirements. AC Delco has been developing motors since 1918 and is interested in leveraging its research and development dollars to produce an array of motor systems for vehicles and to develop a future line of propulsion products. The DOE focus of the study was applied to machining applications. The most attractive feature of this motor is the axial air gap, which may make possible the removal of the motor`s stationary component from a total enclosure of the remainder of the machine if the power characteristics are adequate. The objectives of this project were to evaluate alternative electric drive systems for machine tools and automotive electric drive systems and to select a best machine type for each of those applications. A major challenge of this project was to produce a small, light-weight, highly efficient motor at a cost-effective price. The project developed machine and machine drive systems and design criteria for the range of applications. The final results included the creation of a baseline for developing electric vehicle powertrain system designs, conventional vehicle engine support system designs, and advanced machine tool configurations. In addition, an axial gap permanent magnet motor was built and tested, and gave, said one engineer involved, a sterling performance. This effort will commercialize advanced motor technology and extend knowledge and design capability in the most efficient electric machine design known today.

Adams, D. [Lockheed Martin Energy Systems, Inc., Oak Ridge, TN (United States); Stahura, D. [GM-AC Delco Systems, Indianapolis, IN (United States)

1995-04-30T23:59:59.000Z

127

MotorMaster+  

NLE Websites -- All DOE Office Websites (Extended Search)

industrial facilities, MotorMaster+ 4.0 contains expanded capabilities for inventory management, maintenance logging, lifecycle costing, savings tracking and trending,...

128

Hybrid vehicle motor alignment  

DOE Patents (OSTI)

A rotor of an electric motor for a motor vehicle is aligned to an axis of rotation for a crankshaft of an internal combustion engine having an internal combustion engine and an electric motor. A locator is provided on the crankshaft, a piloting tool is located radially by the first locator to the crankshaft. A stator of the electric motor is aligned to a second locator provided on the piloting tool. The stator is secured to the engine block. The rotor is aligned to the crankshaft and secured thereto.

Levin, Michael Benjamin (Ann Arbor, MI)

2001-07-03T23:59:59.000Z

129

Electric Motor Tiered Maintenance Program  

Science Conference Proceedings (OSTI)

Electric motor predictive and preventive maintenance guidance has been developed to provide information to help maximize motor reliability and to minimize the need for major motor repairs. However, if all recommendations presented in most guides are followed and applied to all motors, the cost of motor maintenance would be unwieldy and consume more than its share of maintenance budgets.

2002-08-27T23:59:59.000Z

130

Converter-fed subsea motor drives  

SciTech Connect

A subsea adjustable-speed motor fed via a long cable in range of several tens of kilometers between the converter and the motor are analyzed by simulations. Due to resonance, one critical frequency range occurs where significant generation of harmonics from the inverter should be avoided. A voltage source inverter is more feasible than a current source inverter since it is easier to modify the output waveform in order to avoid resonance problems. The resistive voltage drop in the long cable reduces the air-gap torque of the motor particular at low frequencies. This causes a problem for the start-up of the motor due to stiction torque. A start-up strategy is envisaged which is a compromise between voltage boost, inverter current, and transformer core dimensions. In normal operation mode the inverter voltage is proportional to the frequency. An open speed lop is used which keeps the system stable for potential load variations. The results from a 1-MW full-scale system test are summarized.

Raad, R.O.; Raphael, H.B. [Statoil, Stavanger (Norway); Henriksen, T. [Norwegian Electric Power Research Inst., Trondheim (Norway); Hadler-Jacobsen, A. [Framo Engineering AS, Nesttun (Norway)

1996-09-01T23:59:59.000Z

131

3D stepper motor system and its GUI A report for project-in-lieu-of-thesis  

E-Print Network (OSTI)

-reluctance step motor 10 2.2 Permanent-magnet step motor 11 2.3 Hybrid step motor 12 3 GUI design essentials 13 41 3D stepper motor system and its GUI design A report for project-in-lieu-of-thesis for masters;2 Table of Content Abstract 3 1. Introduction 4 2. Technology of the step motor system 8 2.1 Variable

Abidi, Mongi A.

132

Neural correlates underlying motor map plasticity and skilled motor behavior  

E-Print Network (OSTI)

of neurons within the motor cortex. Physiol Rev, 1975. 55(and S.P. Wise, The motor cortex of the rat: cytoarchitecturedelayed changes of rat motor cortical output representation

Ramanathan, Dhakshin

2007-01-01T23:59:59.000Z

133

Advanced Manufacturing Office: Motor Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Motor Systems to Motor Systems to someone by E-mail Share Advanced Manufacturing Office: Motor Systems on Facebook Tweet about Advanced Manufacturing Office: Motor Systems on Twitter Bookmark Advanced Manufacturing Office: Motor Systems on Google Bookmark Advanced Manufacturing Office: Motor Systems on Delicious Rank Advanced Manufacturing Office: Motor Systems on Digg Find More places to share Advanced Manufacturing Office: Motor Systems on AddThis.com... Quick Links Energy Resource Center Technical Publications by Energy System Energy-Efficient Technologies Incentives & Resources by Zip Code Better Plants Superior Energy Performance Contacts Motor Systems Photo of Man Checking Motor Performance Motor-driven equipment accounts for 54% of manufacturing electricity use. Dramatic energy and cost savings can be achieved in motor systems by

134

Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature  

SciTech Connect

The present invention maintains constant torque in an inverter driven AC induction motor during variations in rotor temperature. It is known that the torque output of a given AC induction motor is dependent upon rotor temperature. At rotor temperatures higher than the nominal operating condition the rotor impedance increases, reducing the rotor current and motor torque. In a similar fashion, the rotor impedance is reduced resulting in increased rotor current and motor torque when the rotor temperature is lower than the nominal operating condition. The present invention monitors the bus current from the DC supply to the inverter and adjusts the slip frequency of the inverter drive to maintain a constant motor torque. This adjustment is based upon whether predetermined conditions implying increased rotor temperature or decreased rotor temperature exist for longer that a predetermined interval of time.

Kelledes, William L. (Brighton, MI); St. John, Don K. (Livonia, MI)

1992-01-01T23:59:59.000Z

135

motor | OpenEI  

Open Energy Info (EERE)

0 0 Varnish cache server Browse Upload data GDR 429 Throttled (bot load) Error 429 Throttled (bot load) Throttled (bot load) Guru Meditation: XID: 2142279950 Varnish cache server motor Dataset Summary Description The data included in this submission is United States Department of Transportation (DOT) data up to 1995. The data includes motor-fuel gallonage taxes 1950-1995, motor-fuel use 1919-1995, private and commercial highway use of special fuels, by state 1949-1995, highway use of gasoline, by state 1949-1995, gasohol sales by state, 1980-1992, and estimated use of gasohol, 1993-1995. The data is presented in .xlsx format. Source DOT Date Released Unknown Date Updated Unknown Keywords DOT Fuel highway motor vehicle Data application/vnd.openxmlformats-officedocument.spreadsheetml.sheet icon Motor-fuel gallonage taxes 1950-1995 (xlsx, 37.3 KiB)

136

Genetics of motor neuron disease  

Science Conference Proceedings (OSTI)

The number of genes associated with motor neuron degen- eration has increased ... Motor neurons are affected in a large number of neurologic diseases

137

Motor Vehicle Parts Compliance Requirements  

Science Conference Proceedings (OSTI)

... The OVSC compliance testing program is a strong incentive for manufacturers of motor vehicles and items of motor vehicle equipment to ...

2012-09-24T23:59:59.000Z

138

Aurica Motors | Open Energy Information  

Open Energy Info (EERE)

Product California-based Aurica Motors is planning to develop and manufacture an electric vehicle at a former Toyota plant in the state. References Aurica Motors1...

139

VARIABLE TIME-INTERVAL GENERATOR  

DOE Patents (OSTI)

This patent relates to a pulse generator and more particularly to a time interval generator wherein the time interval between pulses is precisely determined. The variable time generator comprises two oscillators with one having a variable frequency output and the other a fixed frequency output. A frequency divider is connected to the variable oscillator for dividing its frequency by a selected factor and a counter is used for counting the periods of the fixed oscillator occurring during a cycle of the divided frequency of the variable oscillator. This defines the period of the variable oscillator in terms of that of the fixed oscillator. A circuit is provided for selecting as a time interval a predetermined number of periods of the variable oscillator. The output of the generator consists of a first pulse produced by a trigger circuit at the start of the time interval and a second pulse marking the end of the time interval produced by the same trigger circuit.

Gross, J.E.

1959-10-31T23:59:59.000Z

140

Energy conversion apparatus for supplying variable voltage direct current power to an electrically propelled vehicle  

SciTech Connect

A synchronous machine, operable as both a motor and a generator, is mounted on an electrically powered vehicle, such as a mine shuttle car, and includes a plurality of conductors having connections that are detachably engagable with receptacles of a stationary power bank. Engagement of the conductors with the receptacles supplies variable voltage alternating current power to the machine. The machine is drivingly connected to a flywheel on the vehicle and, operating as a motor, energizes the flywheel to store a preselected amount of mechanical energy. The electrical connection between the vehicle and the power bank is opened after the flywheel has been sufficiently charged. The stored energy in the flywheel is then available to drive the machine as a generator and produce high frequency, three phase, alternating current power. The generated power is transmitted to a full wave silicon controlled rectifier that converts the alternating current power to direct current for powering the traction motors of the vehicle. A variable voltage controller is connected to the rectifier and actuates the rectifier to supply direct current at a selected voltage level. The controller is responsive to an operator foot pedal. By manually depressing the foot pedal to a selected position, the voltage level of the rectified current is controlled. Thus, the speed of the traction motors is adjustable topropel the vehicle at a speed within a given range. After a portion of the energy stored by the flywheel is consumed, the vehicle is returned to the power bank to replenish the energy supply.

Jamison, W.B.; Burr, J.F.

1976-09-07T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Linear Motor Powered Transportation  

E-Print Network (OSTI)

This special issue on linear-motor powered transportation covers both supporting technologies and innovative transport systems in various parts of the World, as this technology moves from the lab to commercial operations. ...

Thornton, Richard D.

142

Ford Motor Company  

E-Print Network (OSTI)

All statements, findings, and conclusions in this report are those of the authors and do not necessarily reflect those of the Global Interdependence Center, Ford Motor Company, or the Center for Automotive Research. TABLE OF CONTENTS Acknowledgements......................................................................................................................... iv

Ellen Hughes-cromwick; Joshua Cregger

2013-01-01T23:59:59.000Z

143

Retail Motor Gasoline Prices*  

Gasoline and Diesel Fuel Update (EIA)

motor gasoline is projected to be about 1.38 per gallon. As was the case with heating oil, last year's peak average gasoline price, at 1.633 per gallon in June, was the...

144

Summer 2003 Motor Gasoline Outlook  

U.S. Energy Information Administration (EIA)

Summer 2003 Motor Gasoline Outlook ... State gasoline taxes ... that occurred between spring 1999 and fall 2001, ...

145

MOTOR POOL RESERVATIONS Reservation Number:_______________  

E-Print Network (OSTI)

MOTOR POOL RESERVATIONS Reservation Number:_______________ Evanston campus: Chicago campus: 2020: 312/503-9243 E-mail: motor-pool@northwestern.edu E-mail: motor-pool@northwestern.edu Hours: 8:00 a reservations require the "Organization Authorization for University Vehicles" form to be faxed to Motor Pool

Shull, Kenneth R.

146

Markov Process of Muscle Motors  

E-Print Network (OSTI)

We study a Markov random process describing a muscle molecular motor behavior. Every motor is either bound up with a thin filament or unbound. In the bound state the motor creates a force proportional to its displacement from the neutral position. In both states the motor spend an exponential time depending on the state. The thin filament moves at its velocity proportional to average of all displacements of all motors. We assume that the time which a motor stays at the bound state does not depend on its displacement. Then one can find an exact solution of a non-linear equation appearing in the limit of infinite number of the motors.

Yu. Kondratiev; E. Pechersky; S. Pirogov

2007-06-20T23:59:59.000Z

147

Monitoring method and apparatus using high-frequency carrier  

DOE Patents (OSTI)

A method and apparatus for monitoring an electrical-motor-driven device by injecting a high frequency carrier signal onto the power line current. The method is accomplished by injecting a high frequency carrier signal onto an AC power line current. The AC power line current supplies the electrical-motor-driven device with electrical energy. As a result, electrical and mechanical characteristics of the electrical-motor-driven device modulate the high frequency carrier signal and the AC power line current. The high frequency carrier signal is then monitored, conditioned and demodulated. Finally, the modulated high frequency carrier signal is analyzed to ascertain the operating condition of the electrical-motor-driven device.

Haynes, Howard D. (Knoxville, TN)

1996-01-01T23:59:59.000Z

148

Monitoring method and apparatus using high-frequency carrier  

DOE Patents (OSTI)

A method and apparatus for monitoring an electrical-motor-driven device by injecting a high frequency carrier signal onto the power line current. The method is accomplished by injecting a high frequency carrier signal onto an AC power line current. The AC power line current supplies the electrical-motor-driven device with electrical energy. As a result, electrical and mechanical characteristics of the electrical-motor-driven device modulate the high frequency carrier signal and the AC power line current. The high frequency carrier signal is then monitored, conditioned and demodulated. Finally, the modulated high frequency carrier signal is analyzed to ascertain the operating condition of the electrical-motor-driven device. 6 figs.

Haynes, H.D.

1996-04-30T23:59:59.000Z

149

Dynein Motor Domain Shows Ring-Shaped Motor, Buttress  

NLE Websites -- All DOE Office Websites (Extended Search)

Dynein Motor Domain Shows Ring-Shaped Motor, Buttress Print Dynein Motor Domain Shows Ring-Shaped Motor, Buttress Print Movement is fundamental to life. It takes place even at the cellular level where cargo is continually being transported by motor proteins. These tiny machines convert the energy gained from hydrolysing ATP into a series of small conformational changes that allow them to literally "walk" along microscopic tracks. Motor proteins (in the kinesin and myosin families) have been extensively studied by x-ray crystallography, but until recently there was little molecular structural information for dyneins, another type of motor protein. A group from the University of California, San Francisco, working at ALS Beamline 8.3.1 has reported the 6-Å-resolution structure of the motor domain of dynein in yeast. It reveals details of the ring-shaped motor as well as a new, unanticipated feature called the buttress that may play an important role in dynein's mechanical cycle.

150

Dynein Motor Domain Shows Ring-Shaped Motor, Buttress  

NLE Websites -- All DOE Office Websites (Extended Search)

Dynein Motor Domain Shows Ring-Shaped Motor, Buttress Print Dynein Motor Domain Shows Ring-Shaped Motor, Buttress Print Movement is fundamental to life. It takes place even at the cellular level where cargo is continually being transported by motor proteins. These tiny machines convert the energy gained from hydrolysing ATP into a series of small conformational changes that allow them to literally "walk" along microscopic tracks. Motor proteins (in the kinesin and myosin families) have been extensively studied by x-ray crystallography, but until recently there was little molecular structural information for dyneins, another type of motor protein. A group from the University of California, San Francisco, working at ALS Beamline 8.3.1 has reported the 6-Å-resolution structure of the motor domain of dynein in yeast. It reveals details of the ring-shaped motor as well as a new, unanticipated feature called the buttress that may play an important role in dynein's mechanical cycle.

151

Dynein Motor Domain Shows Ring-Shaped Motor, Buttress  

NLE Websites -- All DOE Office Websites (Extended Search)

Dynein Motor Domain Shows Ring-Shaped Motor, Buttress Print Dynein Motor Domain Shows Ring-Shaped Motor, Buttress Print Movement is fundamental to life. It takes place even at the cellular level where cargo is continually being transported by motor proteins. These tiny machines convert the energy gained from hydrolysing ATP into a series of small conformational changes that allow them to literally "walk" along microscopic tracks. Motor proteins (in the kinesin and myosin families) have been extensively studied by x-ray crystallography, but until recently there was little molecular structural information for dyneins, another type of motor protein. A group from the University of California, San Francisco, working at ALS Beamline 8.3.1 has reported the 6-Å-resolution structure of the motor domain of dynein in yeast. It reveals details of the ring-shaped motor as well as a new, unanticipated feature called the buttress that may play an important role in dynein's mechanical cycle.

152

Dynein Motor Domain Shows Ring-Shaped Motor, Buttress  

NLE Websites -- All DOE Office Websites (Extended Search)

Dynein Motor Domain Shows Ring-Shaped Motor, Buttress Print Dynein Motor Domain Shows Ring-Shaped Motor, Buttress Print Movement is fundamental to life. It takes place even at the cellular level where cargo is continually being transported by motor proteins. These tiny machines convert the energy gained from hydrolysing ATP into a series of small conformational changes that allow them to literally "walk" along microscopic tracks. Motor proteins (in the kinesin and myosin families) have been extensively studied by x-ray crystallography, but until recently there was little molecular structural information for dyneins, another type of motor protein. A group from the University of California, San Francisco, working at ALS Beamline 8.3.1 has reported the 6-Å-resolution structure of the motor domain of dynein in yeast. It reveals details of the ring-shaped motor as well as a new, unanticipated feature called the buttress that may play an important role in dynein's mechanical cycle.

153

Ontario Hydro Motor Efficiency Study  

E-Print Network (OSTI)

Electric motors consume more than one-half of the electrical energy produced by Ontario Hydro. In the residential sector, the major motor load is for refrigerators and freezers while packaged equipment dominate the motor load in the commercial market. However, this paper concentrates on the industrial market since 76% of this market's load is motors. The poly phase integral horsepower motor is the "workhorse" of industry. The efficiency of the standard induction motor can be improved. The new "high efficiency" motor is described and the operating cost is compared to the standard motor. Payback for high efficiency motors is found to be about one year for continuous duty applications. Specific instructions are presented for use in industry.

Dautovich, D. R.

1980-01-01T23:59:59.000Z

154

Drilling motor deviation tool  

Science Conference Proceedings (OSTI)

An extension for a down hole drilling motor is described, which adapts the motor for selective configuration for straight hole drilling or directional drilling, selectively. It consists of: an elongated generally tubular body, adapted at a first end to rigidly attach to the lower end of a down hole drilling motor housing, the body having an opening extending along the general centerline of the body; fluid channel means situated in the opening to conduct drilling fluid from the motor fluid output means to a downwardly continuing drill string element; output shaft means situated in the body and extending from a second end of the body, the output shaft adapted at the extended extreme for attachment to a downwardly continuing drill string element; selector valve means situated in the body, operatively associated with drilling fluid channels in the body, responsive to drilling fluid flow to produce a first output signal in response to fluid flow manipulations having a first characteristic and to produce a second output signal in response to fluid flow manipulations having a second characteristic; and driveshaft connector means in the opening, operatively associated with the output shaft of the motor and the output shaft means to connect the two for sympathetic rotation.

Falgout, T.E.; Schoeffler, W.N.

1989-03-14T23:59:59.000Z

155

Strategy for the Operation of Cooling Towers with variable Speed Fans  

E-Print Network (OSTI)

Within the SPS Cooling Water Project at CERN aimed at the reduction of water consumption, this primary open cooling loop will be closed and all the primary cooling circuit components will be upgraded to the new required duty and brought to the necessary safety and operability standards. In particular the tower fans will be fitted with variable frequency drives to replace the existing two speed motors. This paper presents a study to optimize the operation of SPS cooling towers taking into account outdoor conditions (wet and dry bulb temperatures) and the entirety of the primary circuit in which they will operate.

Iigo-Golfn, J

2001-01-01T23:59:59.000Z

156

Sensory-Motor Integration and Control  

E-Print Network (OSTI)

spinal interneurons during motor pattern generation inStep, Swim, and Scratch Motor Patterns in the Turtle. JStep, Swim, and Scratch Motor Patterns in the Turtle. J

Welch, Dan Bruce

2011-01-01T23:59:59.000Z

157

The MotorMaster+ Software Tool  

NLE Websites -- All DOE Office Websites (Extended Search)

motors.html MotorMaster+ also provides technical data that can assist with the optimization of drive systems, motor purchasing, and energy accounting, as well as energy...

158

Brushless Motor Controller Report Spring 2010  

E-Print Network (OSTI)

Brushless Motor Controller Report Spring 2010 May 15, 2010 Brian Clementi MAE of 2010 322 Bogert ...................................................................................................... 5 A. Motor Description...................................................................................................... 5 B. The Motor Controller Board

Ruina, Andy L.

159

Commercial Motor Vehicle Brake-Related Research  

E-Print Network (OSTI)

Commercial Motor Vehicle Brake-Related Research Commercial Motor Vehicle Roadside Technology Corridor Safety Technology Showcase October 14, 2010 Commercial Motor Vehicle Roadside Technology Corridor

160

High-megawatt Electric Drive Motors  

Science Conference Proceedings (OSTI)

... Page 2. ABB BU Machines April 10, 2009 | Slide 2 High-megawatt Electric Drive Motors ... motor concept ... A selection of compressor motors >30MW. ...

2012-10-21T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Advanced Manufacturing Office: MotorMaster+ International  

NLE Websites -- All DOE Office Websites (Extended Search)

special or definite purpose motors. To quickly determine the annual energy and dollar savings of a NEMA Premium efficiency or EFF1 motor over a lower efficiency motor...

162

Bent shaft motor  

DOE Patents (OSTI)

A nonelectromagnetic motor comprising a base, a bent shaft which is rotable relative to the base wherein the bent shaft comprises a straight portion aligned with a main axis and an offset portion that is offset with respect to the main axis; and a drive means for driving the offset portion of the bent shaft along a generally circular path in a plane perpendicular to the main axis to rotate the bent shaft. The bent shaft and drive means for driving the bent shaft can be selected from piezoelectric, magnetostrictive, rheological and shape memory alloys. The drive means of the nonelectromagnetic motor can additionally comprise a shell which shell surrounds and houses the bent shaft and precesses or gyrates which in turn causes the bent drive shaft to rotate. The nonelectromagnetic motor does not rely on friction for the application of torque upon a rotor.

Benavides, Gilbert L. (Albuquerque, NM)

1998-01-01T23:59:59.000Z

163

Dynein Motor Domain Shows Ring-Shaped Motor, Buttress  

NLE Websites -- All DOE Office Websites (Extended Search)

Dynein Motor Domain Shows Ring-Shaped Motor, Buttress Print Movement is fundamental to life. It takes place even at the cellular level where cargo is continually being transported...

164

Design and prototyping methods for brushless motors and motor control  

E-Print Network (OSTI)

In this report, simple, low-cost design and prototyping methods for custom brushless permanent magnet synchronous motors are explored. Three case-study motors are used to develop, illustrate and validate the methods. Two ...

Colton, Shane W. (Shane William)

2010-01-01T23:59:59.000Z

165

motor vehicles | OpenEI  

Open Energy Info (EERE)

motor vehicles motor vehicles Dataset Summary Description The data included in this submission is United States Department of Transportation (DOT) data on rates and revenue statistics up to 1995. The data includes state motor-fuel tax receipts, 1919-1995, state motor fuel taxes and related receipts, 1950-1995, and state and federal motor fuel tax rates, 1919-1995 The data is presented in .xlsx format. Source DOT Date Released Unknown Date Updated Unknown Keywords DOT highway motor vehicles rates revenues Data application/vnd.openxmlformats-officedocument.spreadsheetml.sheet icon State motor-fuel tax receipts, 1919-1995 (xlsx, 13.8 KiB) application/vnd.openxmlformats-officedocument.spreadsheetml.sheet icon State motor fuel taxes and related receipts, 1950-1995 (xlsx, 78.5 KiB)

166

Brandl Motor | Open Energy Information  

Open Energy Info (EERE)

Motor Jump to: navigation, search Name Brandl Motor Address Calvinstr 24 Place Berlin Zip 10557 Sector Marine and Hydrokinetic Phone number +49 30 39 48 06 38 Website http:http:...

167

AGNI Motors | Open Energy Information  

Open Energy Info (EERE)

Place India Zip 370 230 Sector Vehicles Product UK-based manufacturer of DC Motors and Battery Management Systems for Electric Vehicles References AGNI Motors1 LinkedIn...

168

Commercial Motor Vehicle Brake Assessment Tools  

E-Print Network (OSTI)

Commercial Motor Vehicle Brake Assessment Tools Commercial Motor Vehicle Roadside Technology Corridor Safety Technology Showcase October 14, 2010 Commercial Motor Vehicle Roadside Technology Corridor #12;Overview · Commercial Motor Vehicle (CMV) Air Brake System · North American Standard Level-1

169

Multiple stage miniature stepping motor  

DOE Patents (OSTI)

A stepping motor comprising a plurality of stages which may be selectively activated to effect stepping movement of the motor, and which are mounted along a common rotor shaft to achieve considerable reduction in motor size and minimum diameter, whereby sequential activation of the stages results in successive rotor steps with direction being determined by the particular activating sequence followed.

Niven, William A. (Livermore, CA); Shikany, S. David (Danville, CA); Shira, Michael L. (Fremont, CA)

1981-01-01T23:59:59.000Z

170

Guide for Determining Motor Repair versus Motor Replacement  

Science Conference Proceedings (OSTI)

The Motor Replacement/Refurbishment Guide (MRRG) was written to aid with the determination on whether to repair an existing motor or to purchase a replacement motor. This guideline provides the basic tools necessary to make a determination based upon, but not limited to, the extent of the repair scope and the cost of the repair. This guideline presents a process to be utilized by the station or corporate motor specialist to assess the motor repair scope both initial and revised. The data gathering proces...

2005-12-23T23:59:59.000Z

171

Program to develop improved downhole drilling motors. Semi-annual report  

DOE Green Energy (OSTI)

Research progress is reported in two main sections: downhole drilling motor design and design of downhole motor seal, bearing, and test lubrication systems. Information on downhole drilling motor design is presented under the following subsection headings: Turbodrill development; positive displacement motor development; theory of Turbodrills; theory of positive displacement motors; basic motor components; forces on thrust bearings; thrust bearing design; radial bearing design; rotary seal design; sealed lubrication system; lubricants; and project status. The appendix contains information on high temperature lubricants. Information on the design of downhole motor seal, bearing, and test lubrication systems is presented under the following subsection headings: seal, bearing, and lubrication test design criteria; basic test conditions; independent and dependent variable parameters; alternative concepts for seal test apparatus; design of the seal test system; and bearing test system description. A schedule for remaining tasks is included. (JGB)

Maurer, W.C.

1976-11-01T23:59:59.000Z

172

Advanced Manufacturing Office: MotorMaster+  

NLE Websites -- All DOE Office Websites (Extended Search)

schedules Motor inventory information, including motor nameplate information, operating profile, load status, and field measurements Life cycle economics, including depreciation...

173

Adjustable Speed Drive: Harmonic Effects on Induction Motors: Volumes 1 and 2  

Science Conference Proceedings (OSTI)

The use of adjustable speed drives (ASDs) for induction motors in electric power plants has several advantages, but ASDs produce harmonic current and voltage that can result in problems. The Standstill Frequency Response (RFR) program for the personal PC can be used to study these harmonic effects in a wide range of motors.

1995-11-08T23:59:59.000Z

174

Adjustable Speed Drive: Harmonic Effects on Induction Motors: Volumes 1 and 2  

Science Conference Proceedings (OSTI)

The use of adjustable speed drives (ASDs) for induction motors in electric power plants has several advantages, but ASDs produce harmonic current and voltage that can result in problems. The Standstill Frequency Response (RFR) program for the personal PC can be used to study these harmonic effects in a wide range of motors.

1995-11-09T23:59:59.000Z

175

The Research of Traction Motor Energy-Saving Regenerative Braking Control Technology  

Science Conference Proceedings (OSTI)

In all the motor braking control systems, regenerative braking is the only way of energy-saving braking control mode. It can convert dynamic energy which generate during braking period into electric energy, then return to the grid. In this paper, through ... Keywords: regenerative braking, traction motor, direct torque, stator flux, slip frequency

Yuhua Wang; Jianlin Miao; Yuanfang Wei

2010-05-01T23:59:59.000Z

176

Motor technology for mining applications advances  

SciTech Connect

AC motors are steadily replacing DC motors in mining and mineral processing equipment, requiring less maintenance. The permanent magnet rotor, or the synchronous motor, has enabled Blador to introduce a line of cooling tower motors. Synchronous motors are soon likely to take over from the induction motor. 1 photo.

Fiscor, S.

2009-08-15T23:59:59.000Z

177

Evaluating High Efficiency Motor Retrofit  

E-Print Network (OSTI)

In the petrochemical and refining Industries, and most manufacturing plants, the reliable operation of AC motors always has been crucial to the continuous operation of the process. Now, the cost of operating these motors has also become a significant factor. Engineers Involved In motor specification can help lower plant operating costs and reduce electrical energy consumption dramatically by a relatively simple technique: retrofit of existing, standard-efficiency motors with new, high efficiency models. This article demonstrates strong reasons for motor retrofit, and explains step-by step how process and manufacturing engineering personnel can fully evaluate a retrofit decision.

Evans, T. A.

1984-01-01T23:59:59.000Z

178

Retail Motor Gasoline Prices*  

Gasoline and Diesel Fuel Update (EIA)

6 6 Notes: Gasoline pump prices have backed down from the high prices experienced last summer and fall. The retail price for regular motor gasoline fell 11 cents per gallon from September to December. However, with crude oil prices rebounding somewhat from their December lows combined with lower than normal stock levels, we project that prices at the pump will rise modestly as the 2001 driving season begins this spring. For the summer of 2001, we expect only a little difference from the average price of $1.50 per gallon seen during the previous driving season, as motor gasoline stocks going into the driving season are projected to be slightly less than they were last year. The situation of relatively low inventories for gasoline could set the stage for some regional imbalances in supply that could once again

179

Motor gasolines, Summer 1982  

Science Conference Proceedings (OSTI)

The samples were collected from service stations throughout the country and were analyzed in the laboratories of various refiners, motor manufacturers, and chemical companies. The analytical data for 796 samples of motor gasoline, were submitted to the Bartlesville Energy Technology Center for study, necessary calculations, and compilation under a cooperative agreement between the Bartlesville Energy Technology Center (BETC) and the American Petroleum Institute (API). They represent the products of 22 companies, large and small, which manufacture and supply gasoline. These data are tabulated by groups according to brands (unlabeled) and grades for 17 marketing districts into which the country is divided. A map included in this report, shows marketing areas, districts and sampling locations. The report also includes charts indicating the trends of selected properties of motor fuels since 1959. Sixteen octane distribution percent charts for areas 1, 2, 3, and 4 for unleaded antiknock index (R + M)/2 below 90.0, unleaded antiknock index (R + M)/2 90.0 and above, leaded antiknock index (R + M)/2 below 93.0, and leaded antiknock index (R + M)/2 93.0 and above grades of gasoline are presented in this report. The antiknock (octane) index (R + M)/2 averages of gasoline sold in this country were 87.3 for unleaded below 90.0, 91.7 for unleaded 90.0 and above, 89.0 for leaded below 93.0, and no data in this report for 93.0 and above grades of leaded gasoline.

Shelton, E.M.

1983-03-01T23:59:59.000Z

180

Method and apparatus for monitoring motor operated valve motor ...  

A method and apparatus are provided for monitoring a motor operated valve during the brief period when the valve seats and the torque switch trips to deenergize the ...

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Gene Frequency  

NLE Websites -- All DOE Office Websites (Extended Search)

Gene Frequency Gene Frequency Name: donna Location: N/A Country: N/A Date: N/A Question: If six fingers is a dominant human trait why do we have only five? Replies: This is simple. There are just not many genes in the human population for six fingers. Steve Sample Look in any high school biology book for what is known as Hardy-Weinberg equilibrium. These two scientists (separately) said that gene frequencies do not change much unless something in the environment selects them over other genes. In other words, unless 6 fingers somehow becomes an advantage, and five-fingered people have less of an advantage, the frequency of six fingered people in the population will not necessarily increase. This is the same reason that recessive traits don't disappear from the population. Also, six fingers is not considered attractive and they may not get as many mates. Also, more people are born with six fingers than you might imagine but just have them amputated shortly after birth.

182

Advanced Manufacturing Office: MotorMaster+  

NLE Websites -- All DOE Office Websites (Extended Search)

MotorMaster+ to MotorMaster+ to someone by E-mail Share Advanced Manufacturing Office: MotorMaster+ on Facebook Tweet about Advanced Manufacturing Office: MotorMaster+ on Twitter Bookmark Advanced Manufacturing Office: MotorMaster+ on Google Bookmark Advanced Manufacturing Office: MotorMaster+ on Delicious Rank Advanced Manufacturing Office: MotorMaster+ on Digg Find More places to share Advanced Manufacturing Office: MotorMaster+ on AddThis.com... MotorMaster+ This photo shows the inner workings of an industrial electric motor with gears. In the lower left hand corner are the words "MotorMaster+" and underneath are the words "Motor-Driven Systems." Download MotorMaster+ now! Version: 4.01.01 Release Date: September 21, 2010 Release Notes Metric Unit Measurements: No

183

Electric Motors and Critical Materials  

NLE Websites -- All DOE Office Websites (Extended Search)

Research Suggestions (Have an idea of how to get there) * Integration of motor, power converter, and speed reducer * Soft magnetic core material with high saturation...

184

Finished Motor Gasoline Net Production  

U.S. Energy Information Administration (EIA)

-No Data Reported; --= Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. Notes: Finished motor gasoline ...

185

Imports of Total Motor Gasoline  

U.S. Energy Information Administration (EIA)

Reformulated and conventional gasoline production excludes adjustments for fuel ethanol and motor gasoline blending components. Historical data prior to June 4, ...

186

NVLAP Efficiency of Electric Motors  

Science Conference Proceedings (OSTI)

... program was originally developed at the request of the National Electrical Manufacturers Association (NEMA) to assist the electric motor industry in ...

2013-05-14T23:59:59.000Z

187

Primary Metals - Compressor Motors Failing  

Science Conference Proceedings (OSTI)

This power quality (PQ) case study presents the investigation of four failures of compressor motors for a two stage chiller at a primary metals manufacturing facility.

2003-12-31T23:59:59.000Z

188

Shipping and Storage of Electric Motors  

Science Conference Proceedings (OSTI)

Electric motor predictive and preventive maintenance programs have been written and describe the best methodology for increasing motor reliability. However, many utilities have invested substantial resources into the procurement of spare motors. These motors are stored both onsite and off site (at vendor facilities). In addition, motors are being refurbished/reconditioned and must be shipped and possibly stored upon return.

2004-12-20T23:59:59.000Z

189

Patterning of the Ciona intestinalis Motor Ganglion  

E-Print Network (OSTI)

Pitx2 as markers for fast motor neurons and partition cells.for the specification of motor neuron identity. Cell Gans,Tsuda, M. (2010). Simple motor system of the ascidian larva:

Stolfi, Alberto Sunao

2011-01-01T23:59:59.000Z

190

Motor/generator - Energy Innovation Portal  

A motor/generator is provided for connecting between a transmission input shaft and an output shaft of a prime mover. The motor/generator may include a motor ...

191

COMMERICAL MOTOR VEHICLE OPERATOR EMPLOYMENT APPLICATION SUPPLEMENT  

E-Print Network (OSTI)

COMMERICAL MOTOR VEHICLE OPERATOR EMPLOYMENT APPLICATION SUPPLEMENT _________________________________________________________ Applicants for positions involving the operation of a commercial motor vehicle must comply with Title 49 CFR: _______________ Please list the following information for each unexpired commercial motor vehicle operator license

Roy, Subrata

192

Commercial Motor Vehicle Roadside Technology Corridor (CMVRTC)  

E-Print Network (OSTI)

Commercial Motor Vehicle Roadside Technology Corridor (CMVRTC) Oak Ridge National Laboratory Safety Security Vehicle Technologies Research Brief T he Commercial Motor Vehicle Roadside Technology in Tennessee to demonstrate, test, evaluation, and showcase innovative commercial motor vehicle (CMV) safety

193

Industrial motor repair in the United States  

Science Conference Proceedings (OSTI)

This report characterizes the motor repair industry in the United States; summarizes current motor repair and testing practice; and identifies barriers to energy motor repair practice and recommends strategies for overcoming those barriers.

Schueler, V.; Leistner, P.; Douglass, J.

1994-09-01T23:59:59.000Z

194

Using MotorMaster to Track Motor Inventory and Analyze Purchasing Decisions  

E-Print Network (OSTI)

MotorMaster 4.0 can be a useful software package for electric motor management decisions in industrial facilities. To be successful, the MotorMaster database must be populated with detailed motor nameplate information. Georgia Tech worked with a large, motor intensive chemical manufacturing plant to collect motor nameplate information on motors 60 hp or larger and populate the motor database. Approximately 130 motors were identified and surveyed. The completed motor database is used to track maintenance actions and to analyze motor replacement options. The approach used to secure and enter motor nameplate data along with examples of purchasing analyses completed will be presented. The success of the MotorMaster software with large motors has convinced the firm to expand its use to smaller horsepower motors.

Brown, M.; Meffort, W.

2007-01-01T23:59:59.000Z

195

Electric Motors and Power Quality Disturbances  

Science Conference Proceedings (OSTI)

Electric motors and motor-driven systems form the backbone of the industrial sector, but these systems are susceptible to several power quality-related problems. Unbalanced voltages; voltage sags, swells, and interruptions; and overvoltages or undervoltages can cause havoc with motors, including premature motor failure from increased heating, motor inefficiency, poor power factor, and decreased starting and fullload torques. Because motor failures often result in loss of revenue, industries need to take ...

2011-12-30T23:59:59.000Z

196

Trexa Motor Corporation TMC | Open Energy Information  

Open Energy Info (EERE)

Trexa Motor Corporation TMC Jump to: navigation, search Name Trexa Motor Corporation (TMC) Place Los Angeles, California Sector Vehicles Product Los Angeles - based subsidiary of...

197

PC Based wireless stepper motor control.  

E-Print Network (OSTI)

??This project is about making an embedded system in order to control different functionalities of a stepper motor. The main functions of this stepper motor (more)

Jamal, Omar; Khan, Shahnawaz

2013-01-01T23:59:59.000Z

198

CQST/CNEX Efficiency of Electric Motors  

Science Conference Proceedings (OSTI)

CQST/CNEX Efficiency of Electric Motors. NVLAP Lab Code: 200609-0. ... Send E-Mail to NVLAP at: NVLAP@nist.gov. Efficiency of Electric Motors. ...

2013-08-16T23:59:59.000Z

199

Determining Electric Motor Load and Efficiency  

NLE Websites -- All DOE Office Websites (Extended Search)

nance logging, inventory control, energy and dollar savings tracking, and life cycle cost analysis. MotorMaster+ is available at no cost to Motor Challenge Partners. 10 Electrical...

200

Advanced Manufacturing Office: MotorMaster+ International  

NLE Websites -- All DOE Office Websites (Extended Search)

on Twitter Bookmark Advanced Manufacturing Office: MotorMaster+ International on Google Bookmark Advanced Manufacturing Office: MotorMaster+ International on Delicious Rank...

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Mission Motors Company | Open Energy Information  

Open Energy Info (EERE)

Motors Company Place San Francisco, California Zip 94103 Product San Francisco-based electric Motorcycle manufacturer. References Mission Motors Company1 LinkedIn...

202

CQST/CNEX Efficiency of Electric Motors  

Science Conference Proceedings (OSTI)

... of Electric Motors. Accreditation Valid From: January 1, 2013 Through: December 31, 2013. [24/M01] IEEE 112, Method B Electric Motor Efficiency ...

2013-08-16T23:59:59.000Z

203

Turn Motors Off When Not in Use  

SciTech Connect

This is one in a series of tip sheets to help manufacturers optimize their industrial motor and motor-driven systems.

Not Available

2008-07-01T23:59:59.000Z

204

Magnetically Coupled Adjustable Speed Motor Drives  

Science Conference Proceedings (OSTI)

This is one in a series of tip sheets to help manufacturers optimize their industrial motor and motor-driven systems.

Not Available

2008-07-01T23:59:59.000Z

205

Highly Efficient Electric Motor Systems - National Renewable ...  

Electric Motor Systems ... savings. Conical hubs Matching axial field poles. Issued Patents on Motor Geometry. 7 NREL Energy Forum November 2009 www.novatorque.com.

206

Submersible canned motor mixer pump  

DOE Patents (OSTI)

A mixer pump used in a waste tank for mobilizing high-level radioactive liquid waste having a column assembly containing power cables, a motor housing with electric motor means which includes a stator can of a stator assembly and a rotor can of a rotor assembly, and an impeller assembly with an impeller connected to a shaft of the rotor assembly. The column assembly locates the motor housing with the electric motor means adjacent to the impeller which creates an hydraulic head, and which forces the liquid waste into the motor housing to cool the electric motor means and to lubricate radial and thrust bearing assemblies. Hard-on-hard bearing surfaces of the bearing assemblies and a ring assembly between the impeller and electric motor means act to grind down large particles in the liquid waste flow. These larger particles are received in slots in the static bearing members of the radial bearing assemblies. Only solid waste particles smaller than the clearances in the system can pass therethrough, thereby resisting damage to and the interruption of the operation of the mixer pump.

Guardiani, Richard F. (Ohio Township, PA); Pollick, Richard D. (Sarver, PA)

1997-01-01T23:59:59.000Z

207

Submersible canned motor mixer pump  

DOE Patents (OSTI)

A mixer pump is described used in a waste tank for mobilizing high-level radioactive liquid waste having a column assembly containing power cables, a motor housing with electric motor means which includes a stator can of a stator assembly and a rotor can of a rotor assembly, and an impeller assembly with an impeller connected to a shaft of the rotor assembly. The column assembly locates the motor housing with the electric motor means adjacent to the impeller which creates an hydraulic head, and which forces the liquid waste into the motor housing to cool the electric motor means and to lubricate radial and thrust bearing assemblies. Hard-on-hard bearing surfaces of the bearing assemblies and a ring assembly between the impeller and electric motor means act to grind down large particles in the liquid waste flow. These larger particles are received in slots in the static bearing members of the radial bearing assemblies. Only solid waste particles smaller than the clearances in the system can pass there through, thereby resisting damage to and the interruption of the operation of the mixer pump. 10 figs.

Guardiani, R.F.; Pollick, R.D.

1997-10-07T23:59:59.000Z

208

A Novel Approach to Determining Motor Load  

E-Print Network (OSTI)

Properly sized electric motors are essential if industrial plant efficiency is to be optimized and energy costs minimized. Because of the difficulty in making power measurements on three phase motors, loading is rarely, if ever, checked. A simple indication of motor load can be achieved by measuring operating speed because speed and load are almost linearly related. The decrease in motor speed from no load conditions, referred to as slip, can be determined with a non-contact, optical tachometer. Field measurements of motor slip were conducted at a textile plant to quantify motor load conditions. To verify the relationship between operating speed and load, measurements of motor power consumption on a representative number of motors were also conducted. The results of the motor survey, including number of motors, size, and load, are summarized in this paper along with an estimate of the savings from replacing oversized motors.

Brown, M.

1992-04-01T23:59:59.000Z

209

Digital slip frequency generator and method for determining the desired slip frequency  

DOE Patents (OSTI)

The output frequency of an electric power generator is kept constant with variable rotor speed by automatic adjustment of the excitation slip frequency. The invention features a digital slip frequency generator which provides sine and cosine waveforms from a look-up table, which are combined with real and reactive power output of the power generator.

Klein, Frederick F. (Monroeville, PA)

1989-01-01T23:59:59.000Z

210

Research Laboratories General Motors Corporation General Motors Technical Center  

Office of Legacy Management (LM)

MI. 1-q Research Laboratories General Motors Corporation General Motors Technical Center Warren, Michigan 48090 January 21, 1977 Occupational Health Standards Branch Office of Standards Development U. S. Nuclear Requlatory Commission Washington, D.C. 20555 Attention: Mr. Robert E. Alexander, Chief Dear Mr. Alexander: In 1974, General Motors Corporation acquired a manufacturing plant in Adrian, Michigan. On October 21, 1976, General Motors announced that work would begin immediately to prepare the plant for manufacturing operations (Appendix A). A news release, made by Mr. Irving Loop of ERDA and carried by radio station WABJ of Adrian, Michigan on May 11, 1976, stated that natural uranium was handled in the plant after World War II and that

211

Biophysics of filament length regulation by molecular motors  

E-Print Network (OSTI)

Regulating physical size is an essential problem that biological organisms must solve from the subcellular to the organismal scales, but it is not well understood what physical principles and mechanisms organisms use to sense and regulate their size. Any biophysical size-regulation scheme operates in a noisy environment and must be robust to other cellular dynamics and fluctuations. This work develops theory of filament length regulation inspired by recent experiments on kinesin-8 motor proteins, which move with directional bias on microtubule filaments and alter microtubule dynamics. Purified kinesin-8 motors can depolymerize chemically-stabilized microtubules. In the length-dependent depolymerization model, the rate of depolymerization tends to increase with filament length, because long filaments accumulate more motors at their tips and therefore shorten more quickly. When balanced with a constant filament growth rate, this mechanism can lead to a fixed polymer length. However, the mechanism by which kinesin-8 motors affect the length of dynamic microtubules in cells is less clear. We study the more biologically realistic problem of microtubule dynamic instability modulated by a motor-dependent increase in the filament catastrophe frequency. This leads to a significant decrease in the mean filament length and a narrowing of the filament length distribution. The results improve our understanding of the biophysics of length regulation in cells.

Hui-Shun Kuan; M. D. Betterton

2013-02-13T23:59:59.000Z

212

Finished Motor Gasoline Net Production  

Gasoline and Diesel Fuel Update (EIA)

Data Series: Finished Motor Gasoline Finished Motor Gasoline (less Adj.) Reformulated Gasoline Reformulated Gasoline Blenede w/ Fuel Ethanol Reformulated Other Gasoline Conventional Gasoline Conventional Gasoline Blended w/ Fuel Ethanol Conventional Gasoline Blended w/ Fuel Ethanol, Ed55 & Ed55 Other Conventional Gasoline Finished Motor Gasoline Adjustment Kerosene-Type Jet Fuel Kerosene-Type Jet, Commercial Kerosene-Type Jet, Military Distillate Fuel Oil Distillate Fuel Oil, 15 ppm Sulfur and Under Distillate Fuel Oil > 15 ppm to 500 ppm Sulfur Distillate Fuel Oil > 500 ppm Sulfur Residual Fuel Oil Propane/Propylene Period: Weekly 4-Week Average

213

Variable Screw Compressor, Variable Screw Compressor Suppliers ...  

U.S. Energy Information Administration (EIA)

Variable Screw Compressor Suppliers & air compressor Manufacturers Directory. Source Top Quality Variable Screw Compressor Suppliers, air ...

214

Myers Motors | Open Energy Information  

Open Energy Info (EERE)

Myers Motors Myers Motors Jump to: navigation, search Name Myers Motors Place Tallmadge, Ohio Zip 44278 Sector Vehicles Product Myers Motors produces three wheeled electric vehicles. Coordinates 41.10294°, -81.440864° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.10294,"lon":-81.440864,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

215

General Motors | Open Energy Information  

Open Energy Info (EERE)

description http:www.nrel.govnewspress2006375.html LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now General Motors is a company located in...

216

AQWON Motors | Open Energy Information  

Open Energy Info (EERE)

AQWON Motors AQWON Motors Jump to: navigation, search Name AQWON-Motors Place Speinshart, Germany Zip 92676 Sector Hydro, Hydrogen Product AQWON-Motors has developed the first hydrogen powered 2 stroke-engine scooter. It has been approved by the German TÃœVÂ (the official technical inspection agency). Coordinates 49.78699°, 11.820385° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":49.78699,"lon":11.820385,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

217

Tesla Motors | Open Energy Information  

Open Energy Info (EERE)

Tesla Motors Tesla Motors Jump to: navigation, search Logo: Tesla Motors Name Tesla Motors Address 1050 Bing Street Place San Carlos, California Zip 94070 Sector Vehicles Product Produces electric vehicles Website http://www.teslamotors.com/ Coordinates 37.496737°, -122.245323° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":37.496737,"lon":-122.245323,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

218

Transport Characteristics of Molecular Motors  

E-Print Network (OSTI)

Properties of transport of molecular motors are investigated. A simplified model based on the concept of Brownian ratchets is applied. We analyze a stochastic equation of motion by means of numerical methods. The transport is systematically studied with respect to its energetic efficiency and quality expressed by an effective diffusion coefficient. We demonstrate the role of friction and non-equilibrium driving on the transport quantifiers and identify regions of a parameter space where motors are optimally transported.

Machura, Lukasz; Luczka, Jerzy; 10.1016/j.biosystems.2008.05.033

2011-01-01T23:59:59.000Z

219

Segmented rail linear induction motor  

DOE Patents (OSTI)

A segmented rail linear induction motor has a segmented rail consisting of a plurality of nonferrous electrically conductive segments aligned along a guideway. The motor further includes a carriage including at least one pair of opposed coils fastened to the carriage for moving the carriage. A power source applies an electric current to the coils to induce currents in the conductive surfaces to repel the coils from adjacent edges of the conductive surfaces. 6 figs.

Cowan, M. Jr.; Marder, B.M.

1996-09-03T23:59:59.000Z

220

Direct drive field actuator motors  

DOE Patents (OSTI)

A positive-drive field actuator motor is described which includes a stator carrying at least one field actuator which changes in dimension responsive to application of an energy field, and at least one drive shoe movable by the dimensional changes of the field actuator to contact and move a rotor element with respect to the stator. Various embodiments of the motor are disclosed, and the rotor element may be moved linearly or arcuately. 62 figs.

Grahn, A.R.

1998-03-10T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Segmented rail linear induction motor  

DOE Patents (OSTI)

A segmented rail linear induction motor has a segmented rail consisting of a plurality of nonferrous electrically conductive segments aligned along a guideway. The motor further includes a carriage including at least one pair of opposed coils fastened to the carriage for moving the carriage. A power source applies an electric current to the coils to induce currents in the conductive surfaces to repel the coils from adjacent edges of the conductive surfaces.

Cowan, Jr., Maynard (1107 Stagecoach Rd. SE., Albuquerque, NM 87123); Marder, Barry M. (1412 Pinnacle View Dr. NE., Albuquerque, NM 87123)

1996-01-01T23:59:59.000Z

222

Comparison and Analysis of Classical Motor with Amorphous Iron Motor Based on Ansoft  

Science Conference Proceedings (OSTI)

At present, various types of motors of total power is up to 420 million kilowatts and the consumption accounts for 60% of country's total electricity. The motor is high cost, energy consumption and so on while it is produced using traditional materials ... Keywords: Ansoft, amorphous iron motor, motor modeling, motor simulation

Jianwei Leng; Ting Liu

2010-08-01T23:59:59.000Z

223

Low-Frequency Signals in Midtropospheric Submonthly Temperature Variance  

Science Conference Proceedings (OSTI)

Low-frequency signals in the daily variability of temperature in the midtroposphere are investigated, thereby complementing published studies of changes in day-to-day temperature variability and in extreme weather events at the surface. The ...

Haig Iskenderian; Richard D. Rosen

2000-07-01T23:59:59.000Z

224

EERE-2010-BT-STD-0027 Ex Parte Letter NEMA Motor Training re DOE Motors  

NLE Websites -- All DOE Office Websites (Extended Search)

0-BT-STD-0027 Ex Parte Letter NEMA Motor Training re DOE 0-BT-STD-0027 Ex Parte Letter NEMA Motor Training re DOE Motors Rule 15 July 2013. EERE-2010-BT-STD-0027 Ex Parte Letter NEMA Motor Training re DOE Motors Rule 15 July 2013. This memorandum memorializes a communication between DOE staff and members of the NEMA Motor and Generator Section in connection with this proceeding. NEMA thanks the DOE for the opportunity to conduct training for DOE staff and its consultants on July 15th, 2013 which illustrated the different types of motors, motor construction theory and motor applications by type. It is our hope that better understanding of motor types and construction will assist the Department and its consultants with the discharge of their duties. EERE-2010-BT-STD-0027 Ex Parte Letter NEMA Motor Training re DOE Motors

225

Conducting a Motor Survey: Key Step for Establishing a Motor Management Policy  

E-Print Network (OSTI)

Roughly 70% of the energy consumed by manufacturing processes is used by electric motors. According to the U.S. Department of Energy, greater attention to motor systems management can reduce motor-related energy costs by 18%. Establishing a motor management policy is therefore an essential task for any plant manager or engineer concerned with minimizing motor (and process) downtime and reducing energy costs. In order to develop an effective motor policy, a manager needs information on the number and condition of motors in use. A targeted motor survey will collect data on a representative sample of a plant's motor population. This survey information will then provide a basis for further development of the motor policy. This paper discusses the process of conducting a motor survey. It identifies the type of information to be collected, along with a methodology for selecting appropriate sample motors for more detailed investigations.

Miller, R. B.

2002-04-01T23:59:59.000Z

226

Efficient Low-Lift cooling with Radiant Distribution, Thermal Storage and Variable-Speed Chiller Controls Part II: Annual Energy Use and Savings  

DOE Green Energy (OSTI)

This paper evaluates the potential cooling efficiency improvements to be gained by integrating radiant cooling, cool storage, and variable-speed compressor and transport motor controls.

Armstrong, Peter; Jiang, Wei; Winiarski, David W.; Katipamula, Srinivas; Norford, L. K.

2009-03-31T23:59:59.000Z

227

ENERGY STAR Success Story: Loews Hotels  

NLE Websites -- All DOE Office Websites (Extended Search)

variable frequency drives on large motors across all 18 facilities 30% reduction in motor electric load Installed capacitors on large pumps, motors, and air handler units in...

228

Time and Frequency Portal  

Science Conference Proceedings (OSTI)

NIST Home > Time and Frequency Portal. Time and Frequency Portal. Programs and Projects. CODATA values of the fundamental constants ...

2013-06-27T23:59:59.000Z

229

Performance Variability  

NLE Websites -- All DOE Office Websites (Extended Search)

Variability Variability of Highly Parallel Architectures William T.C. Kramer 1 and Clint Ryan 2 1 Department of Computing Sciences, University of California at Berkeley and the National Energy Research Scientific Computing Center, Lawrence Berkeley National Laboratory 2 Department of Computing Sciences, University of California at Berkeley Abstract. The design and evaluation of high performance computers has concentrated on increasing computational speed for applications. This performance is often measured on a well configured dedicated sys- tem to show the best case. In the real environment, resources are not always dedicated to a single task, and systems run tasks that may influ- ence each other, so run times vary, sometimes to an unreasonably large extent. This paper explores the amount of variation seen across four large distributed memory systems in a systematic manner. It then

230

Method and apparatus for pulse width modulation control of an AC induction motor  

SciTech Connect

An inverter is connected between a source of DC power and a three-phase AC induction motor, and a micro-processor-based circuit controls the inverter using pulse width modulation techniques. In the disclosed method of pulse width modulation, both edges of each pulse of a carrier pulse train are equally modulated by a time proportional to sin .THETA., where .THETA. is the angular displacement of the pulse center at the motor stator frequency from a fixed reference point on the carrier waveform. The carrier waveform frequency is a multiple of the motor stator frequency. The modulated pulse train is then applied to each of the motor phase inputs with respective phase shifts of 120.degree. at the stator frequency. Switching control commands of electronic switches in the inverter are stored in a random access memory (RAM) and the locations of the RAM are successively read out in a cyclic manner, each bit of a given RAM location controlling a respective phase input of the motor. The DC power source preferably comprises rechargeable batteries and all but one of the electronic switches in the inverter can be disabled, the remaining electronic switch being part of a "flyback" DC-DC converter circuit for recharging the battery.

Geppert, Steven (Bloomfield Hills, MI); Slicker, James M. (Union Lake, MI)

1984-01-01T23:59:59.000Z

231

Three phase AC motor controller  

DOE Patents (OSTI)

A motor controller for a three phase AC motor (10) which is adapted to operate bidirectionally from signals received either from a computer (30) or a manual control (32). The controller is comprised of digital logic circuit means which implement a forward and reverse command signal channel (27, 29) for the application of power through the forward and reverse power switching relays (16, 18, 20, 22). The digital logic elements are cross coupled to prevent activation of both channels simultaneously and each includes a plugging circuit (65, 67) for stopping the motor upon the removal of control signal applied to one of the two channels (27, 29) for a direction of rotation desired. Each plugging circuit (65, 67) includes a one-shot pulse signal generator (88, 102) which outputs a single pulse signal of predetermined pulsewidth which is adapted to inhibit further operation of the application of power in the channel which is being activated and to apply a reversal command signal to the other channel which provides a reversed phase application of power to the motor for a period defined by the pulse-width output of the one-shot signal generator to plug the motor (10) which will then be inoperative until another rotational command signal is applied to either of the two channels.

Vuckovich, Michael (Elizabeth, PA); Wright, Maynard K. (Bethel Park, PA); Burkett, John P. (South Huntington Township, Westmoreland County, PA)

1984-03-20T23:59:59.000Z

232

Reduced vibration motor winding arrangement  

DOE Patents (OSTI)

The present invention relates generally to an electric motor winding and, more particularly, to a three phase motor armature winding arrangement designed to reduce motor vibration and improve efficiency. An individual phase winding arrangement having a sixty electrical degree phase belt width for use with a three phase motor armature includes a delta connected phase winding portion and a wye connected phase winding portion. Both the delta and wye connected phase winding portions have a thirty electrical degree phase belt width. The delta and wye connected phase winding portions are each formed from a preselected number of individual coils each formed, in turn, from an unequal number of electrical conductor turns in the approximate ratio of {radical}3. The individual coils of the delta and wye connected phase winding portions may either be connected in series or parallel. This arrangement provides an armature winding for a three phase motor which retains the benefits of the widely known and utilized thirty degree phase belt concept, including improved mmf waveform and fundamental distribution factor.

Slavik, C.J.; Rhudy, R.G.; Bushman, R.E.

1995-12-31T23:59:59.000Z

233

Motor generator electric automotive vehicle  

SciTech Connect

A motor generator electric automotive vehicle is described comprising in combination, a traction drive motor coupled by a first drive shaft to a differential of an axle of the vehicle, a main battery bank electrically connected by wires to a small electric motor driving a large D.C. generator having a second drive shaft therebetween, an on-off switch in series with one of the wires to the small motor, a speed control unit attached to an accelerator pedal of the vehicle being coupled with a double pole-double throw reverse switch to the traction drive motor, a charger regulator electrically connected to the generator, a bank of solar cells coupled to the charge regulator, an electric extension cord from the charge regulator having a plug on its end for selective connection to an exterior electric power source, a plurality of pulleys on the second drive shaft, a belt unit driven by the pulley, one the belt unit being connected to a present alternator of the vehicle which is coupled to a present battery and present regulator of the vehicle, and other of the units being connected to power brakes and equipment including power steering and an air conditioner.

Weldin, W.

1986-07-29T23:59:59.000Z

234

The infant motor profile : a standardized and qualitative assessment of motor bahaviour in infancy.  

E-Print Network (OSTI)

??This thesis presents the Infant Motor Profile (IMP), a new, video-based qualitative assessment of motor behaviour of infants aged 3 to 18 months. The IMP (more)

Heineman, Kirsten Roselien

2010-01-01T23:59:59.000Z

235

Carbonyl Emissions from Gasoline and Diesel Motor Vehicles  

E-Print Network (OSTI)

Carbonyl compounds present in motor vehicle exhaust, rangingfrom gasoline and diesel motor vehicles. Environ. Sci. Tech.composition and toxicity of motor vehicle emission samples.

Jakober, Chris A.

2008-01-01T23:59:59.000Z

236

Mechanisms of motor activity regulation in axonal transport  

E-Print Network (OSTI)

emerging principles of kinesin motor utilization." Annu Revopposite-polarity microtubule motors." J Cell Biol 156( 4):Kinesin mutations cause motor neuron disease phenotypes by

Reis, Gerald Feliz

2008-01-01T23:59:59.000Z

237

Demand, Supply, and Price Outlook for Reformulated Motor Gasoline 1995  

U.S. Energy Information Administration (EIA)

benzene extracted from the reformulated motor gasoline pool in their conventional motor gasoline. Importers lacking 1990 motor gasoline quality data with which to

238

Building Energy Software Tools Directory: MotorMaster+  

NLE Websites -- All DOE Office Websites (Extended Search)

implement an effective energy management program. MotorMaster+ contains a motor inventory module, where motor nameplate data is stored and linked to utility, facility, plant...

239

VIA Motors electric vehicle platform | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

VIA Motors electric vehicle platform VIA Motors electric vehicle platform extended range electric vehicle technologies VIA Motors electric vehicle platform More Documents &...

240

Lab 4 -Motor Constants and Sensor Calibration Consider a DC servo motor which is connected to a power supply. The motor inertia is Jm. The rotational  

E-Print Network (OSTI)

Lab 4 - Motor Constants and Sensor Calibration PRE-LAB Consider a DC servo motor which is connected to a power supply. The motor inertia is Jm. The rotational damping in the motor is bm. The motor produces a torque Tm = Kmi where Km is the motor's torque constant and i is the current from the power supply. a

Stanford University

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Mission Motors | Open Energy Information  

Open Energy Info (EERE)

Motors Motors Jump to: navigation, search Name Mission Motors Place San Francisco, California Sector Vehicles Product Electric Motorcycles Year founded 2007 Number of employees 11-50 Website http://www.ridemission.com/ Coordinates 37.7749295°, -122.4194155° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":37.7749295,"lon":-122.4194155,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

242

Aptera Motors | Open Energy Information  

Open Energy Info (EERE)

Aptera Motors Aptera Motors Jump to: navigation, search Name Aptera Motors Address 2778 Loker Avenue West Place Carlsbad, California Zip 92008 Sector Vehicles Product Aims to to make an aerodynamic two-seater hybrid electric vehicle Website http://www.aptera.com/ Coordinates 33.1412124°, -117.3205123° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":33.1412124,"lon":-117.3205123,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

243

Homopolar motor with dual rotors  

DOE Patents (OSTI)

A homopolar motor has a field rotor mounted on a frame for rotation in a first rotational direction and for producing an electromagnetic field, and an armature rotor mounted for rotation on said frame within said electromagnetic field and in a second rotational direction counter to said first rotational direction of said field rotor. The two rotors are coupled through a 1:1 gearing mechanism, so as to travel at the same speed but in opposite directions. This doubles the output voltage and output power, as compared to a motor in which only the armature is rotated. Several embodiments are disclosed. 7 figs.

Hsu, J.S.

1998-12-01T23:59:59.000Z

244

Thermoelectric generator for motor vehicle  

DOE Patents (OSTI)

A thermoelectric generator for producing electric power for a motor vehicle from the heat of the exhaust gasses produced by the engine of the motor vehicle. The exhaust gasses pass through a finned heat transfer support structure which has seat positions on its outside surface for the positioning of thermoelectric modules. A good contact cylinder provides a framework from which a spring force can be applied to the thermoelectric modules to hold them in good contact on their seats on the surface of the heat transfer support structure.

Bass, John C. (6121 La Pintra Dr., La Jolla, CA 92037)

1997-04-29T23:59:59.000Z

245

Weather Noise Forcing of Surface Climate Variability  

Science Conference Proceedings (OSTI)

A model-based method to evaluate the role of weather noise forcing of low-frequency variability of surface properties, including SST, surface currents, land surface temperature, and soil moisture, is presented. In this procedure, an interactive ...

Edwin K. Schneider; Meizhu Fan

2007-09-01T23:59:59.000Z

246

The Allocation of the Social Costs of Motor-Vehicle Use to Six Classes of Motor Vehicles  

E-Print Network (OSTI)

alcohol Unfinished oils Motor gasoline blending componentsalcohol Unfinished oils Motor gasoline blending componentsthe Use of Persian-Gulf Oil for Motor Vehicles (M. Delucchi

Delucchi, Mark A.

1996-01-01T23:59:59.000Z

247

Frequency of Precipitation across the Northern U.S. Corn Belt  

Science Conference Proceedings (OSTI)

Knowledge of the frequency of precipitation events can aid in managing water resources, but little is known concerning the regional variability in the frequency of daily precipitation events in the northern U.S. Corn Belt. The frequency ...

B. S. Sharratt; J. Zandlo; G. Spoden

2001-02-01T23:59:59.000Z

248

Variable Renewable Generation Can Provide Balancing Control to...  

NLE Websites -- All DOE Office Websites (Extended Search)

Variable Renewable Generation Can Provide Balancing Control to the Electric Power System e Active Power Control Helps Maintain System Frequency As wind and solar plants become more...

249

Analysis of hunting in Synchronous Hysteresis Motor  

E-Print Network (OSTI)

The Synchronous Hysteresis Motor has an inherent instability when it is used to drive a gyroscope wheel. The motor ideally should spin at a constant angular velocity, but it instead sporadically oscillates about synchronous ...

Truong, Cang Kim, 1979-

2004-01-01T23:59:59.000Z

250

Hybrid vehicle motor alignment - Energy Innovation Portal  

A rotor of an electric motor for a motor vehicle is aligned to an axis of rotation for a crankshaft of an internal combustion engine having an internal combustion ...

251

Electric Motor Predictive Maintenance: Draft Guidelines  

Science Conference Proceedings (OSTI)

Predictive Maintenance can enhance the early detection and avoidance of incipient equipment failures in electric motors. This report provides draft guidelines to support the development of electric motor predictive maintenance (EMPM) programs at utility sites.

1997-10-16T23:59:59.000Z

252

Self-bearing motor design & control  

E-Print Network (OSTI)

This thesis presents the design, implementation and control of a new class of self-bearing motors. The primary thesis contributions include the design and experimental demonstration of hysteresis self-bearing motors, novel ...

Imani Nejad, Mohammad

2013-01-01T23:59:59.000Z

253

Measuring Devices: Compressed Natural Gas Retail Motor ...  

Science Conference Proceedings (OSTI)

Compressed Natural Gas Retail Motor-Fuel Dispensers. ... Hydrogen Measuring Devices; Liquefied Petroleum Gas Liquid-Measuring Devices; ...

2010-10-05T23:59:59.000Z

254

Motorized control for mirror mount apparatus  

DOE Patents (OSTI)

A motorized control and automatic braking system for adjusting mirror mount apparatus is disclosed. The motor control includes a planetary gear arrangement to provide improved pitch adjustment capability while permitting a small packaged design. The motor control for mirror mount adjustment is suitable for laser beam propagation applications. The brake is a system of constant contact, floating detents which engage the planetary gear at selected between-teeth increments to stop rotation instantaneously when the drive motor stops.

Cutburth, Ronald W. (Tracy, CA)

1989-01-01T23:59:59.000Z

255

Retail Motor-Fuel Dispensers and Consoles  

Science Conference Proceedings (OSTI)

Retail Motor-Fuel Dispensers and Consoles. Purpose: This 5-day RMFD course provides participants with the knowledge ...

2013-01-11T23:59:59.000Z

256

Advanced Electric Motor Predictive Maintenance Project  

Science Conference Proceedings (OSTI)

EPRI sponsored the three-year Advanced Electric Motor Predictive Maintenance (AEMPM) project in 2000 to increase the effectiveness of motor maintenance at a time when utilities were in a state of declining motor knowledge due to downsizing and restructuring. The project identified areas for improvement that were common to most utilities and selected appropriate measures to address these concerns. Areas addressed include documenting motor knowledge, increasing utility confidence in newer technologies and ...

2003-05-28T23:59:59.000Z

257

NEW MOTOR DESIGN CONCEPT FOR ENERGY SAVING APPLIED TO  

E-Print Network (OSTI)

SHARK, NEW MOTOR DESIGN CONCEPT FOR ENERGY SAVING APPLIED TO SWITCHED RELUCTANCE MOTOR by Ana of the cylindrical and Shark air gap Switched Reluctance Motors and their assistance during the experimental work with other motor technologies such

258

Coupling between motor proteins determines dynamic behaviors of motor protein assemblies  

E-Print Network (OSTI)

Coupling between motor proteins determines dynamic behaviors of motor protein assemblies Jonathan W of intracellular cargos by multiple microtubule motor proteins is believed to be a common and significant phenomenon in vivo, yet signatures of the microscopic dynamics of multiple motor systems are only now

259

Electric Motor Predictive and Preventive Maintenance Guide  

Science Conference Proceedings (OSTI)

Electric motor failure could result in lost capacity as well as excessive repair and maintenance costs. This guide provides information on establishing an effective maintenance program to help prevent unexpected motor failures, costly downtime, and unnecessary maintenance costs. Specifically, the guide summarizes technical data relative to four basic power plant motor types and associated components.

1992-05-02T23:59:59.000Z

260

Total Cost of Motor-Vehicle Use  

E-Print Network (OSTI)

the use of Persian-Gulf oil by motor vehicles The sociallye r s i a n - G u l f Oil f o r Motor Vehicles 16. T h e C ofor motor vehicles: lost consumer surplus in other oil-

Delucchi, Mark A.

1996-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Magnetic tweezers to study DNA motors  

E-Print Network (OSTI)

Magnetic tweezers to study DNA motors Maria Mañosas Ritort lab UB Barcelona Croquette-Bensimon lab ENS France #12;· Introduction to MT (magnetic tweezers) · Applications: 1. Tracking DNA motors: (i) Helicases (ii) Annealing motor 2. Studying a multiprotein system: DNA replication Outline #12;· Atomic force

Ritort, Felix

262

Thermodynamics and Kinetics of a Brownian Motor  

E-Print Network (OSTI)

Thermodynamics and Kinetics of a Brownian Motor R. Dean Astumian Nonequilibrium fluctuations particle separation and the design of molecular motors and pumps. A small particle in a liquid is subject in conjunction with an- isotropy to drive a motor in the context of a "ratchet and pawl" device shrunk to micro

Linke, Heiner

263

INDUCTION MOTOR FAULT DIAGNOSTIC AND MONITORING METHODS  

E-Print Network (OSTI)

INDUCTION MOTOR FAULT DIAGNOSTIC AND MONITORING METHODS by Aderiano M. da Silva, B.S. A Thesis;i Abstract Induction motors are used worldwide as the "workhorse" in industrial applications material. However, induction motor faults can be detected in an initial stage in order to prevent

Povinelli, Richard J.

264

Radial-Gap Permanent Magnet Motor and Drive Research FY 2004  

SciTech Connect

The objective of this task was to study permanent magnet (PM) radial-gap traction drive systems that could meet the U.S. Department of Energy FreedomCAR Program's 2010 goals to expose weaknesses or identify strengths. Initially, the approach was to compare attributes such as physical deformations during operation, performance (torque, power, efficiency versus speed), material requirements (strength), material costs, manufacturability, weight, power density, specific power, reliability, and drivability for specific motors. Three motors selected were the commercially available 60-kW radial-gap surface-mounted PM motor manufactured by UQM Technologies, Inc.; a hypothetical PM motor with rotor-supported magnets similar to the Honda MCF-21; and Delphi's automotive electric machine drive motor, whose rotor is a ferromagnetic cylinder, held at one end by a shaft that supports the magnets on its inner surface. Potential problems have appeared related to PM motors, such as (1) high no-load spin losses and high operational power losses, probably from eddy current losses in the rotor; (2) the undemonstrated dual mode inverter control (DMIC) for driving a brushless dc motor (BDCM) (UQM and Delphi motors); (3) uncertainty about the potential for reducing current with DMIC; and (4) uncertainty about the relation between material requirements and maximum rotor speed. Therefore, the approach was changed to study in detail three of the comparison attributes: drivability, performance, and material requirements. Drivability and related problems were examined by demonstrating that DMIC may be used to drive an 18-pole 30-kW PM motor to 6000 rpm, where the maximum electrical frequency is 900 Hz. An available axial-gap test motor with 18 poles was used because its control is identical to that of a radial gap PM motor. Performance was analytically examined, which led to a derivation showing that DMIC controls a PM motor so that the motor uses minimum current to produce any power regardless of speed for relative speeds, n = {omega}/{omega}{sub base} {ge} 2. Performance was also examined with efficiency measurements during the 30-kW PM motor test. Material requirements were examined with finite-element analyses (FEA) to determine the speed and location where yield starts and the corresponding deformations and stresses.

McKeever, J.W.

2005-02-11T23:59:59.000Z

265

Ameren Illinois (Electric) - Custom, HVAC, and Motor Business...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Custom, HVAC, and Motor Business Efficiency Incentives Ameren Illinois (Electric) - Custom, HVAC, and Motor Business Efficiency Incentives Eligibility Commercial Industrial...

266

Evaluation of half wave induction motor drive for use in passenger vehicles. Final report  

SciTech Connect

This report describes research performed to devise and design a lower cost inverter-induction motor drive for electrical propulsion of passenger vehicles. A two-phase inverter-motor system is recommended. It is predicted to provide comparable vehicle performance, improved reliability and nearly a 10% cost advantage for a high production vehicle because of the reduction in total parts count, decreased total rating of the power semiconductor switches and somewhat simpler control hardware compared to the conventional three-phase bridge inverter-motor drive system. The major disadvantages of the two-phase inverter-motor drive are that the tow-phase motor is larger and more expensive than a three-phase machine, the design of snubbers for the power switches is difficult because motor lead and bifilar winding leakage inductances produce higher transient voltages, and the torque pulsations are relatively large because of the necessity to limit the inverter switching frequency to achieve high efficiency. An actuall model of the two-phase system must be constructed and evaluated. The most challenging engineering design task will be to design the inverter, motor and snubber circuits to minimize transient voltages with high system efficiency.

Hoft, R.G.; Kawamura, A.; Goodarzi, A.; Yang, G.Q.; Erickson, C.L.

1985-05-01T23:59:59.000Z

267

Torque limit of PM motors for field-weakening region operation  

SciTech Connect

The invention includes a motor controller and technique for controlling a permanent magnet motor. In accordance with one aspect of the present technique, a permanent magnet motor is controlled by receiving a torque command, determining a physical torque limit based on a stator frequency, determining a theoretical torque limit based on a maximum available voltage and motor inductance ratio, and limiting the torque command to the smaller of the physical torque limit and the theoretical torque limit. Receiving the torque command may include normalizing the torque command to obtain a normalized torque command, determining the physical torque limit may include determining a normalized physical torque limit, determining a theoretical torque limit may include determining a normalized theoretical torque limit, and limiting the torque command may include limiting the normalized torque command to the smaller of the normalized physical torque limit and the normalized theoretical torque limit.

Royak, Semyon (Beachwood, OH); Harbaugh, Mark M. (Richfield, OH)

2012-02-14T23:59:59.000Z

268

Multilevel DC Link Inverter for Brushless Permanent Magnet Motors with Very Low Inductance  

SciTech Connect

Due to their long effective air gaps, permanent magnet motors tend to have low inductance. The use of ironless stator structure in present high power PM motors (several tens of kWs) reduces the inductance even further (< 100 {micro}H). This low inductance imposes stringent current regulation demands for the inverter to obtain acceptable current ripple. An analysis of the current ripple for these low inductance brushless PM motors shows that a standard inverter with the most commonly used IGBT switching devices cannot meet the current regulation demands and will produce unacceptable current ripples due to the IGBT's limited switching frequency. This paper introduces a new multilevel dc link inverter, which can dramatically reduce the current ripple for brushless PM motor drives. The operating principle and design guidelines are included.

Su, G.J.

2001-10-29T23:59:59.000Z

269

Influence of direct motor-motor interaction in models for cargo transport by a single team of motors  

E-Print Network (OSTI)

We analyze theoretically the effects of excluded-volume interactions between motors on the dynamics of a cargo driven by multiple motors. The model considered shares many commons with other recently proposed in the literature, with the addition of direct interaction between motors and motor back steps. The cargo is assumed to follow a continuum Langevin dynamics, while individual motors evolve following a Monte Carlo algorithm based on experimentally accessible probabilities for discrete forward and backward jumps, and attachment and detachment rates. The links between cargo and motors are considered as non linear springs. By means of numerical simulations we compute the relevant quantities characterizing the dynamical properties of the system, and we compare the results to those for non interacting motors. We find that interactions lead to quite relevant changes in the force-velocity relation for cargo, with a considerable reduction of the stall force, and cause also a notable decrease of the run length. The...

Bouzat, Sebastian; 10.1088/1478-3975/7/4/046009

2010-01-01T23:59:59.000Z

270

Method and apparatus for monitoring motor operated valve motor output torque and power at valve seating  

DOE Patents (OSTI)

A method and apparatus are provided for monitoring a motor operated valve during the brief period when the valve seats and the torque switch trips to deenergize the valve motor. The method uses voltage measurements on the load side of a deenergizing switch that opens to deenergize the motor to determine, among other things, final motor rotational speed and the decelerating torque at motor deenergization.

Casada, Donald A. (Oak Ridge, TN)

1996-01-01T23:59:59.000Z

271

Method and apparatus for monitoring motor operated valve motor output torque and power at valve seating  

DOE Patents (OSTI)

A method and apparatus are provided for monitoring a motor operated valve during the brief period when the valve seats and the torque switch trips to deenergize the valve motor. The method uses voltage measurements on the load side of a deenergizing switch that opens to deenergize the motor to determine, among other things, final motor rotational speed and the decelerating torque at motor deenergization. 14 figs.

Casada, D.A.

1996-01-16T23:59:59.000Z

272

Use of MCC-Based Motor Torque Measurements for Periodic Verification of Motor-Operated Valves  

Science Conference Proceedings (OSTI)

This report develops, justifies, and validates a motor control center- (MCC-) based motor torque periodic verification (MTPV) method for torque-switch-controlled closing strokes of rising stem motor-operated valves (MOVs) with ac motors. The report details the evaluation of motor torque data obtained from electrical measurements at the MCC and covers the use of these (and other) measurements in MOV periodic verification (PV) testing.

2006-03-30T23:59:59.000Z

273

Method and apparatus for controlling multiple motors  

DOE Patents (OSTI)

A method and apparatus are provided for simultaneously controlling a plurality of stepper motors. Addressing circuitry generates address data for each motor in a periodic address sequence. Memory circuits respond to the address data for each motor by accessing a corresponding memory location containing a first operational data set functionally related to a direction for moving the motor, speed data, and rate of speed change. First logic circuits respond to the first data set to generate a motor step command. Second logic circuits respond to the command from the first logic circuits to generate a third data set for replacing the first data set in memory with a current operational motor status, which becomes the first data set when the motor is next addressed.

Jones, Rollin G. (Los Alamos, NM); Kortegaard, Bert L. (Los Alamos, NM); Jones, David F. (Los Alamos, NM)

1987-01-01T23:59:59.000Z

274

Method and apparatus for controlling multiple motors  

DOE Patents (OSTI)

A method and apparatus are provided for simultaneously controlling a plurality of stepper motors. Addressing circuitry generates address data for each motor in a periodic address sequence. Memory circuits respond to the address data for each motor by accessing a corresponding memory location containing a first operational data set functionally related to a direction for moving the motor, speed data, and rate of speed change. First logic circuits respond to the first data set to generate a motor step command. Second logic circuits respond to the command from the first logic circuits to generate a third data set for replacing the first data set in memory with a current operational motor status, which becomes the first data set when the motor is next addressed.

Jones, R.G.; Kortegaard, B.L.; Jones, D.F.

1986-07-22T23:59:59.000Z

275

MTBE, Oxygenates, and Motor Gasoline  

Gasoline and Diesel Fuel Update (EIA)

MTBE, Oxygenates, and MTBE, Oxygenates, and Motor Gasoline Contents * Introduction * Federal gasoline product quality regulations * What are oxygenates? * Who gets gasoline with oxygenates? * Which areas get MTBE? * How much has been invested in MTBE production capacity? * What does new Ethanol capacity cost? * What would an MTBE ban cost? * On-line information resources * Endnotes * Summary of revisions to this analysis Introduction The blending of methyl tertiary butyl ether (MTBE) into motor gasoline has increased dramatically since it was first produced 20 years ago. MTBE usage grew in the early 1980's in response to octane demand resulting initially from the phaseout of lead from gasoline and later from rising demand for premium gasoline. The oxygenated gasoline program stimulated an

276

Reduced vibration motor winding arrangement  

DOE Patents (OSTI)

An individual phase winding arrangement having a sixty electrical degree phase belt width for use with a three phase motor armature includes a delta connected phase winding portion and a wye connected phase winding portion. Both the delta and wye connected phase winding portions have a thirty electrical degree phase belt width. The delta and wye connected phase winding portions are each formed from a preselected number of individual coils each formed, in turn, from an unequal number of electrical conductor turns in the approximate ratio of {radical}3. The individual coils of the delta and wye connected phase winding portions may either be connected in series or parallel. This arrangement provides an armature winding for a three phase motor which retains the benefits of the widely known and utilized thirty degree phase belt concept, including improved mmf waveform and fundamental distribution factor, with consequent reduced vibrations and improved efficiency. 4 figs.

Slavik, C.J.; Rhudy, R.G.; Bushman, R.E.

1997-11-11T23:59:59.000Z

277

Hermetically sealed superconducting magnet motor  

DOE Patents (OSTI)

A hermetically sealed superconducting magnet motor includes a rotor separated from a stator by either a radial gap, an axial gap, or a combined axial and radial gap. Dual conically shaped stators are used in one embodiment to levitate a disc-shaped rotor made of superconducting material within a conduit for moving cryogenic fluid. As the rotor is caused to rotate when the field stator is energized, the fluid is pumped through the conduit. 6 figs.

DeVault, R.C.; McConnell, B.W.; Phillips, B.A.

1996-07-02T23:59:59.000Z

278

Hermetically sealed superconducting magnet motor  

DOE Patents (OSTI)

A hermetically sealed superconducting magnet motor includes a rotor separated from a stator by either a radial gap, an axial gap, or a combined axial and radial gap. Dual conically shaped stators are used in one embodiment to levitate a disc-shaped rotor made of superconducting material within a conduit for moving cryogenic fluid. As the rotor is caused to rotate when the field stator is energized, the fluid is pumped through the conduit.

DeVault, Robert C. (Knoxville, TN); McConnell, Benjamin W. (Knoxville, TN); Phillips, Benjamin A. (Benton Harbor, MI)

1996-01-01T23:59:59.000Z

279

Solid Rocket Motor Acoustic Testing  

DOE Green Energy (OSTI)

Acoustic data are often required for the determination of launch and powered flight loads for rocket systems and payloads. Such data are usually acquired during test firings of the solid rocket motors. In the current work, these data were obtained for two tests at a remote test facility where we were visitors. This paper describes the data acquisition and the requirements for working at a remote site, interfacing with the test hosts.

Rogers, J.D.

1999-03-31T23:59:59.000Z

280

INSPECTION MEANS FOR INDUCTION MOTORS  

DOE Patents (OSTI)

an appartus is descripbe for inspcting electric motors and more expecially an appartus for detecting falty end rings inn suqirrel cage inductio motors while the motor is running. In its broua aspects, the mer would around ce of reference tedtor means also itons in the phase ition of the An electronic circuit for conversion of excess-3 binary coded serial decimal numbers to straight binary coded serial decimal numbers is reported. The converter of the invention in its basic form generally coded pulse words of a type having an algebraic sign digit followed serially by a plurality of decimal digits in order of decreasing significance preceding a y algebraic sign digit followed serially by a plurality of decimal digits in order of decreasing significance. A switching martix is coupled to said input circuit and is internally connected to produce serial straight binary coded pulse groups indicative of the excess-3 coded input. A stepping circuit is coupled to the switching matrix and to a synchronous counter having a plurality of x decimal digit and plurality of y decimal digit indicator terminals. The stepping circuit steps the counter in synchornism with the serial binary pulse group output from the switching matrix to successively produce pulses at corresponding ones of the x and y decimal digit indicator terminals. The combinations of straight binary coded pulse groups and corresponding decimal digit indicator signals so produced comprise a basic output suitable for application to a variety of output apparatus.

Williams, A.W.

1959-03-10T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

The Application Research of AC Frequency Conversion Technique in Transmission Control System of Oil Rig  

Science Conference Proceedings (OSTI)

This paper mainly introduced the basic structure and work principle of transmission agent on electric drilling rig, meanwhile the frequency control and parallel operation of motors used in the transmission agent were analyzed and designed. Using parallel ... Keywords: Rig, Transmission, Frequency control, Parallel Operation Control

Ruifan Yang; Yong Peng

2010-03-01T23:59:59.000Z

282

Coupling of Two Motor Proteins: a New Motor Can Move Faster  

E-Print Network (OSTI)

We study the effect of a coupling between two motor domains in highly-processive motor protein complexes. A simple stochastic discrete model, in which the two parts of the protein molecule interact through some energy potential, is presented. The exact analytical solutions for the dynamic properties of the combined motor species, such as the velocity and dispersion, are derived in terms of the properties of free individual motor domains and the interaction potential. It is shown that the coupling between the motor domains can create a more efficient motor protein that can move faster than individual particles. The results are applied to analyze the motion of helicase RecBCD molecules.

Evgeny B. Stukalin; Hubert Phillips III; Anatoly B. Kolomeisky

2005-02-19T23:59:59.000Z

283

Method for assessing in-service motor efficiency and in-service motor/load efficiency  

DOE Patents (OSTI)

A method and apparatus for assessing the efficiency of an in-service motor. The operating characteristics of the in-service motor are remotely measured. The operating characteristics are then applied to an equivalent circuit for electrical motors. Finally the equivalent circuit is evaluated to determine the performance characteristics of said in-service motor. Based upon the evaluation an individual is able to determine the rotor speed, power output, efficiency, and toque of the in-service motor. Additionally, an individual is able to confirm the calculations by comparing measured values with values obtained as a result of the motor equivalent circuit evaluation.

Kueck, John D. (Oak Ridge, TN); Otaduy, Pedro J. (Oak Ridge, TN)

1997-01-01T23:59:59.000Z

284

Assessment of Efficiency and Application of Advanced Motor Technologies  

Science Conference Proceedings (OSTI)

This technical update explores four major emerging motor technologies. The four advanced motor types are Permanent magnet Brushless DC Motors (BLDC), Permanent Magnet Synchronous Motors (PMSM), Switched Reluctance Motors and Field Oriented Vector Control Motors. These motor technologies are not necessarily new, but are becoming popular and attractive solutions because of material cost reductions, controller innovations or the promise of higher efficiency and improved component reliability. Overall, the a...

2009-12-23T23:59:59.000Z

285

Removing Spurious Low-Frequency Variability in Drifter Velocities  

Science Conference Proceedings (OSTI)

Satellite-tracked drifting buoys of the Global Drifter Program have drogues, centered at 15-m depth, to minimize direct wind forcing and Stokes drift. Drogue presence has historically been determined from submergence or tether strain records. ...

Rick Lumpkin; Semyon A. Grodsky; Luca Centurioni; Marie-Helene Rio; James A. Carton; Dongkyu Lee

2013-02-01T23:59:59.000Z

286

Singular Modes and Low-Frequency Atmospheric Variability  

Science Conference Proceedings (OSTI)

Recently, it has been shown that the EOFs (empirical orthogonal functions) of the solutions of a stationary linear model to an ensemble of white noise forcing fields are the Schmidt modes (singular modes) of the model' linear operator. If the ...

Werner Metz

1994-06-01T23:59:59.000Z

287

Low-Frequency Pycnocline Variability in the Northeast Pacific  

Science Conference Proceedings (OSTI)

The output from an ocean general circulation model (OGCM) driven by observed surface forcing is used in conjunction with simpler dynamical models to examine the physical mechanisms responsible for interannual to interdecadal pycnocline ...

Antonietta Capotondi; Michael A. Alexander; Clara Deser; Arthur J. Miller

2005-08-01T23:59:59.000Z

288

The switching dynamics of the bacterial flagellar motor  

E-Print Network (OSTI)

Many swimming bacteria are propelled by flagellar motors that stochastically switch between the clockwise and counterclockwise rotation direction. While the switching dynamics are one of the most important characteristics of flagellar motors, the mechanisms that control switching are poorly understood. We present a statistical-mechanical model of the flagellar rotary motor, which consists of a number of stator proteins that drive the rotation of a ring of rotor proteins, which in turn drives the rotation of a flagellar filament. At the heart of our model is the assumption that the rotor protein complex can exist in two conformational states corresponding to the two respective rotation directions, and that switching between these states depends on interactions with the stator proteins. This naturally couples the switching dynamics to the rotation dynamics, making the switch sensitive to torque and speed. Another key element of our model is that after a switching event, it takes time for the load to build up, due to polymorphic transitions of the filament. Our model predicts that this slow relaxation dynamics of the filament, in combination with the load dependence of the switching frequency, leads to a characteristic switching time, in agreement with recent observations.

Siebe B. van Albada; Sorin Tanase-Nicola; Pieter Rein ten Wolde

2008-11-14T23:59:59.000Z

289

U.S. total motor gasoline exports down slightly from last year but ...  

U.S. Energy Information Administration (EIA)

Greenhouse gas data, voluntary report- ing, electric power plant emissions. ... Total motor gasoline = finished motor gasoline + motor gasoline blending components.

290

Electric Motor Efficiency Standards and Regulations  

Science Conference Proceedings (OSTI)

The last few years have seen the introduction of new standards and regulations for electric motor efficiency in the United States and elsewhere. The Energy Independence and Security Act (EISA) of 2007 is perhaps the most significant of these and is expected to have a considerable impact on electric motor efficiency in the United States. Based on the National Equipment Manufacturers Association (NEMA) MG 1 2010 Premium Efficiency standard, EISA 2007 mandates that all new induction motors (barring some exc...

2011-07-31T23:59:59.000Z

291

Rotary steerable motor system for underground drilling  

Science Conference Proceedings (OSTI)

A preferred embodiment of a system for rotating and guiding a drill bit in an underground bore includes a drilling motor and a drive shaft coupled to drilling motor so that drill bit can be rotated by the drilling motor. The system further includes a guidance module having an actuating arm movable between an extended position wherein the actuating arm can contact a surface of the bore and thereby exert a force on the housing of the guidance module, and a retracted position.

Turner, William E. (Durham, CT); Perry, Carl A. (Middletown, CT); Wassell, Mark E. (Kingwood, TX); Barbely, Jason R. (Middletown, CT); Burgess, Daniel E. (Middletown, CT); Cobern, Martin E. (Cheshire, CT)

2010-07-27T23:59:59.000Z

292

Writing Motor Specifications - How to Include Efficiency  

E-Print Network (OSTI)

The escalating cost of electric power coupled with the rapid depletion of our non-renewable resources makes consideration of motor efficiency good sense both from economic and conservation viewpoints. The efficiency of an electric motor can be assessed during bid evaluation by applying loss penalties: however, the actual value can be influenced at an earlier stage by a careful review of what goes into the motor specification.

Quartermaine, B. J.

1980-01-01T23:59:59.000Z

293

System and method for determining stator winding resistance in an AC motor using motor drives  

DOE Patents (OSTI)

A system and method for determining the stator winding resistance of AC motors is provided. The system includes an AC motor drive having an input connectable to an AC source and an output connectable to an input terminal of an AC motor, a pulse width modulation (PWM) converter having switches therein to control current flow and terminal voltages in the AC motor, and a control system connected to the PWM converter. The control system generates a command signal to cause the PWM converter to control an output of the AC motor drive corresponding to an input to the AC motor, selectively generates a modified command signal to cause the PWM converter to inject a DC signal into the output of the AC motor drive, and determines a stator winding resistance of the AC motor based on the DC signal of at least one of the voltage and current.

Lu, Bin; Habetler, Thomas G; Zhang, Pinjia

2013-02-26T23:59:59.000Z

294

Motor Systems Assessment Training, Including Use of the Motor Systems Tool Suite  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Motor Systems Assessment Training Motor Systems Assessment Training Presented by: Gilbert McCoy, PE Washington State University Extension Energy Program (360) 956-2086 mccoyg@energy.wsu.edu 2 Motor Systems Assessment Training 3 Motor Systems Assessment Training Department of Energy Information Resources U.S. DOE Industrial Technologies Program (ITP) BestPractices Website www.eere.energy.gov/industry/bestpractices EERE Information Center (877) 337-3463 Or www.eere.energy.gov/informationcenter 4 Motor Systems Assessment Training Big Picture Perspectives: Industrial Motor Systems Industrial motor systems: � Are the single largest electrical end use category in the American economy � Account for 23% of U.S. electrical sales. 5 Motor Systems Assessment Training Ultimate

295

Reduced vibration motor winding arrangement - Energy ...  

An individual phase winding arrangement having a sixty electrical degree phase belt width for use with a three phase motor armature includes a delta connected phase ...

296

DOE Energy Information Administration Motor Gasoline Watch  

U.S. Energy Information Administration (EIA)

Motor Gasoline Watch November 18, 1998. SUPPLY. Higher production levels and a decline in demand contributed to an increase in stocks last week.

297

Measuring Devices: Retail Motor-Fuel Dispensers  

Science Conference Proceedings (OSTI)

Retail Motor-Fuel Dispensers - Single, Dual, and Multi-Product and Blended Product. Intro about it. EPOs, Field Manual, Training ...

2010-10-05T23:59:59.000Z

298

Total Economics of Energy Efficient Motors  

E-Print Network (OSTI)

Due to the large increases in cost of electrical energy in recent years, the energy savings attainable with the use of energy-efficient motors is very attractive to all motor users. But energy and electric demand charge savings tell only part of the story. Engineers responsible for the selection of motors for many varying uses must also consider many less tangible factors when deciding whether a price premium for an energy-efficient motor is justified. These important intangible factors may throw a borderline decision in favor of a premium motor; at other times these factors may dictate that the capital money could be spent more wisely in other areas. This paper will point out those factors which effect the decision of whether or not to buy a premium priced energy-efficient motor or a standard electric motor. It will also address the question of whether it is cost-effective to rewind an old motor which has failed or to replace it with a new energy-efficient motor.

Nester, A. T.

1984-01-01T23:59:59.000Z

299

Electrical system for a motor vehicle  

SciTech Connect

In one embodiment of the present invention, an electrical system for a motor vehicle comprises a capacitor, an engine cranking motor coupled to receive motive power from the capacitor, a storage battery and an electrical generator having an electrical power output, the output coupled to provide electrical energy to the capacitor and to the storage battery. The electrical system also includes a resistor which limits current flow from the battery to the engine cranking motor. The electrical system further includes a diode which allows current flow through the diode from the generator to the battery but which blocks current flow through the diode from the battery to the cranking motor.

Tamor, Michael Alan (Toledo, OH)

1999-01-01T23:59:59.000Z

300

Tesla Motors Inc | Open Energy Information  

Open Energy Info (EERE)

Carlos, California Zip 94070 Sector Vehicles Product California-based producer of luxury electric vehicles, such as sports cars. References Tesla Motors Inc1 LinkedIn...

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Food Industry - Motor Contactors Burning Up  

Science Conference Proceedings (OSTI)

This power quality (PQ) case study presents the investigation of motor contactors that have burnt up several times in the last year at a food manufacturing facility.

2003-12-31T23:59:59.000Z

302

Synchronous operation of the BLDC motor  

E-Print Network (OSTI)

The brushless de (BLDC) motor is becoming widely used and popular in the small horsepower motor applications. Factors such as simplicity in control, low cost, high efficiency, low frame size, high torque per inertia, high power density and, most importantly, being br-ushless are the reasons that make the BLDC motor very attractive in motor drive applications. In this research a systematic approach to synchronous operation of the brushless DC (BLDC) motor has been investigated and implemented. This thesis establishes principles of synchronous operation of the BLDC motor, develops stable operating conditions, derives the required implementation formulas and introduces some new definitions. The synchronous system follows, open loop, a speed command. The system has been provided by two input references: current and speed. The current reference throughout the operation has been kept constant at the maximum applicable continuous current to obtain maximum torque. Current regulation has been achieved by hysteresis current control. The speed reference has been varied from zero speed to the desired speed linearly. Once speed reaches to the desired speed, it is kept constant at the desired speed. Since the motor operates synchronously and no position information has been used, the motor has to follow exactly the reference speed, otherwise pull out occurs. By this implementation, three operating points of the BLDC motor with synchronous operational system has been presented. One of the three operating points at maximum speed corresponds to maximum load operation.

Guzelgunler, Yilcan

1998-01-01T23:59:59.000Z

303

Electrical system for a motor vehicle  

DOE Patents (OSTI)

In one embodiment of the present invention, an electrical system for a motor vehicle comprises a capacitor, an engine cranking motor coupled to receive motive power from the capacitor, a storage battery and an electrical generator having an electrical power output, the output coupled to provide electrical energy to the capacitor and to the storage battery. The electrical system also includes a resistor which limits current flow from the battery to the engine cranking motor. The electrical system further includes a diode which allows current flow through the diode from the generator to the battery but which blocks current flow through the diode from the battery to the cranking motor. 2 figs.

Tamor, M.A.

1999-07-20T23:59:59.000Z

304

Electric Motor Drive Selection Issues for HEV Propulsion Systems: A Comparative Study  

E-Print Network (OSTI)

, the induction motor, the permanent magnet synchronous motor, and the switched reluctance motor. The main motor, the permanent magnet synchronous motor, and the switched reluctance motor [2]. Cross induction motors and the permanent magnet motors are highly dominant, whereas those on dc motors

Paris-Sud XI, Université de

305

The LatestThe LatestThe LatestThe Latest,,,, Quick Motor EvaluationQuick Motor EvaluationQuick Motor EvaluationQuick Motor Evaluation Myway Plus Development of Specialized Equipment  

E-Print Network (OSTI)

The LatestThe LatestThe LatestThe Latest,,,, Quick Motor EvaluationQuick Motor EvaluationQuick Motor EvaluationQuick Motor Evaluation Myway Plus Development of Specialized Equipment Myway Plus developed a quick test/evaluation equipment for highly efficient hybrid car (HV) motor. The equipment

Kambhampati, Patanjali

306

Electric Motor Remanufacturing and Energy Savings Sahil Sahni1  

E-Print Network (OSTI)

Electric Motor Remanufacturing and Energy Savings Sahil Sahni1 , Avid Boustani1 , Timothy Gutowski to this study. #12;Contents 1 Introduction to Electric Motors 1 1.1 Motor Classifications . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Performance of Motors . . . . . . . . . . . . . . . . . . . . . . 4 1.3 Impact of motor

Gutowski, Timothy

307

Motor Energy Saving Opportunities in an Industrial Plant  

E-Print Network (OSTI)

Industrial plants have enormous energy saving opportunities with electric motors. Improving motor efficiency is a conventional wisdom to save energy. Re-engineering affords far greater savings opportunities than motor efficiency improvement. Motor energy saving techniques and basics are discussed. A case study is presented where 63% motor energy savings were realized.

Kumar, B.; Elwell, A.

1999-05-01T23:59:59.000Z

308

,"U.S. Sales to End Users, Total Refiner Motor Gasoline Sales Volumes"  

U.S. Energy Information Administration (EIA) Indexed Site

Users, Total Refiner Motor Gasoline Sales Volumes" Users, Total Refiner Motor Gasoline Sales Volumes" ,"Click worksheet name or tab at bottom for data" ,"Worksheet Name","Description","# Of Series","Frequency","Latest Data for" ,"Data 1","Products for Refiner Gasoline Volumes",1,"Monthly","9/2013","1/15/1983" ,"Data 2","by Grade",3,"Monthly","9/2013","1/15/1983" ,"Data 3","by Formulation",3,"Monthly","9/2013","1/15/1994" ,"Release Date:","12/2/2013" ,"Next Release Date:","1/2/2014" ,"Excel File Name:","pet_cons_refmg_d_nus_vtr_mgalpd_m.xls"

309

Recommended Rest Frequencies  

Science Conference Proceedings (OSTI)

Return to Table of Contents NIST Recommended Rest Frequencies for Observed Interstellar Molecular Microwave Transitions. by Frank J. Lovas. ...

310

Eastern Frequency Response Study  

Science Conference Proceedings (OSTI)

This study was specifically designed to investigate the frequency response of the Eastern Interconnection that results from large loss-of-generation events of the type targeted by the North American Electric Reliability Corp. Standard BAL-003 Frequency Response and Frequency Bias Setting (NERC 2012a), under possible future system conditions with high levels of wind generation.

Miller, N.W.; Shao, M.; Pajic, S.; D'Aquila, R.

2013-05-01T23:59:59.000Z

311

Fluctuating-friction molecular motors  

E-Print Network (OSTI)

Abstract. We show that the correlated stochastic fluctuation of the friction coefficient can give rise to long-range directional motion of a particle undergoing Brownian random walk in a constant periodic energy potential landscape. The occurrence of this motion requires the presence of two additional independent bodies interacting with the particle via friction and via the energy potential, respectively, which can move relative to each other. Such three-body system generalizes the classical Brownian ratchet mechanism, which requires only two interacting bodies. In particular, we describe a simple two-level model of fluctuating-friction molecular motor that can be solved analytically. In our previous work [M.K., L.M and D.P. 2000 J. Nonlinear Opt. Phys. Mater. 9 157] this model has been first applied to understanding the fundamental mechanism of the photoinduced reorientation of dye-doped liquid crystals. Applications of the same idea to other fields such as molecular biology and nanotechnology can however be envisioned. As an example, in this paper we work out a model of the actomyosin system based on the fluctuating-friction mechanism. PACS numbers: 05.40.+j, 42.70.Df, 87.10.+eFluctuating-friction molecular motors 2 1.

unknown authors

2001-01-01T23:59:59.000Z

312

Abstract--There are two types of drivers in production machine systems: constant velocity (CV) motor and servo-motor.  

E-Print Network (OSTI)

) motor and servo-motor. If a system contains two drivers or more, among which some are of the CV motor while the other are the servo-motor, the system has the so-called hybrid driver architecture is stable. A simulation is performed to show verify the proposed controller. The CV motor has the velocity

Zhang, WJ "Chris"

313

Motor Pool Guidelines for Geosciences A completed Motor Pool Request form must be submitted to Denise for  

E-Print Network (OSTI)

Motor Pool Guidelines for Geosciences · A completed Motor Pool Request form must be submitted on the Geosciences website under the forms link. http://www.geo.arizona.edu/pdf/motor_pool_request.pdf · If the trip be submitted with the Motor Pool Request. · A list of passengers and drivers is for all motor pool travel (this

Holliday, Vance T.

314

Influence of direct motor-motor interaction in models for cargo transport by a single team of motors  

E-Print Network (OSTI)

We analyze theoretically the effects of excluded-volume interactions between motors on the dynamics of a cargo driven by multiple motors. The model considered shares many commons with other recently proposed in the literature, with the addition of direct interaction between motors and motor back steps. The cargo is assumed to follow a continuum Langevin dynamics, while individual motors evolve following a Monte Carlo algorithm based on experimentally accessible probabilities for discrete forward and backward jumps, and attachment and detachment rates. The links between cargo and motors are considered as non linear springs. By means of numerical simulations we compute the relevant quantities characterizing the dynamical properties of the system, and we compare the results to those for non interacting motors. We find that interactions lead to quite relevant changes in the force-velocity relation for cargo, with a considerable reduction of the stall force, and cause also a notable decrease of the run length. These effects are mainly due to traffic-like phenomena in the microtubule. The consideration of several parallel tracks for motors reduces such effects. However, we find that for realistic values of the number of motors and the number of tracks, the influence of interactions on the global parameters of transport of cargo are far from being negligible. Our studies provide also an analysis of the relevance of motor back steps on the modeling, and of the influence of different assumptions for the detachment rates. In particular, we discuss these two aspects in connection with the possibility of observing processive back motion of cargo at large load forces.

Sebastian Bouzat; Fernando Falo

2010-12-14T23:59:59.000Z

315

Rare-Earth-Free Traction Motor: Rare Earth-Free Traction Motor for Electric Vehicle Applications  

Science Conference Proceedings (OSTI)

REACT Project: Baldor will develop a new type of traction motor with the potential to efficiently power future generations of EVs. Unlike todays large, bulky EV motors which use expensive, imported rare-earth-based magnets, Baldors motor could be light, compact, contain no rare earth materials, and have the potential to deliver more torque at a substantially lower cost. Key innovations in this project include the use of a unique motor design, incorporation of an improved cooling system, and the development of advanced materials manufacturing techniques. These innovations could significantly reduce the cost of an electric motor.

None

2012-01-01T23:59:59.000Z

316

Pulp and Paper Mills: Profiting for Efficient Motor System Use...  

NLE Websites -- All DOE Office Websites (Extended Search)

Motor System Use This profile discusses how energy efficienct motor systems can help pulp and paper mills save money. Pulp and Paper Mills: Profiting for Efficient Motor System Use...

317

Motor Neurons Controlling Fluid Ingestion in Drosophila melanogaster  

E-Print Network (OSTI)

coordination of rhythmic motor patterns. J Neurophysiol 90:Figure 3.5. Individual motor neurons project to eitherGraphs as in (C-D) for MN12 motor neurons. n=10-13 flies per

Manzo, Andrea

2011-01-01T23:59:59.000Z

318

Gas Mileage of 1986 Vehicles by Vixen Motor Company  

NLE Websites -- All DOE Office Websites (Extended Search)

Vixen Motor Company Vehicles EPA MPG MODEL City Comb Hwy 1986 Vixen Motor Company 21 TD 6 cyl, 2.4 L, Manual 5-spd, Diesel Compare 1986 Vixen Motor Company 21 TD 15 City 16...

319

Gas Mileage of 1984 Vehicles by Avanti Motor Corporation  

NLE Websites -- All DOE Office Websites (Extended Search)

84 Avanti Motor Corporation Vehicles EPA MPG MODEL City Comb Hwy 1984 Avanti Motor Corporation Avanti II 8 cyl, 5.0 L, Automatic 4-spd, Regular Gasoline Compare 1984 Avanti Motor...

320

Department of Electrical Engineering Fall 2009 Electridyne Motor  

E-Print Network (OSTI)

PENNSTATE Department of Electrical Engineering Fall 2009 Electridyne Motor Overview Our sponsored project was to design an elecrtic motor for an urban transportation vehicle, the challenges involved included research into motor design, consideration of the materials, and the electromagnetic parameters

Demirel, Melik C.

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Designing Alternatives to State Motor Fuel Taxes  

E-Print Network (OSTI)

Designing Alternatives to State Motor Fuel Taxes All states rely on gasoline taxes as one source are financed from a wide variety of sources, all states use motor fuel taxes as an important source of funds of funds for road improvement and mainte- nance. Historically, gasoline usage has been roughly proportional

Bertini, Robert L.

322

Oscillation control system for electric motor drive  

DOE Patents (OSTI)

A feedback system for controlling mechanical oscillations in the torsionally complaint drive train of an electric or other vehicle. Motor speed is converted in a processor to estimate state signals in which a plant model which are used to electronically modify the torque commands applied to the motor. 5 figs.

Slicker, J.M.; Sereshteh, A.

1988-08-30T23:59:59.000Z

323

Oscillation control system for electric motor drive  

DOE Patents (OSTI)

A feedback system for controlling mechanical oscillations in the torsionally complaint drive train of an electric or other vehicle. Motor speed is converted in a processor to estimate state signals in which a plant model which are used to electronically modify thetorque commands applied to the motor.

Slicker, James M. (Union Lake, MI); Sereshteh, Ahmad (Union Lake, MI)

1988-01-01T23:59:59.000Z

324

A Numerical Model for Low-Frequency Equatorial Dynamics  

Science Conference Proceedings (OSTI)

A fast, efficient numerical procedure for modeling the linear low-frequency motions on an equatorial beta plane is developed. The model is capable of simulating the seasonal and interannual variability in realistically shaped ocean basins forced ...

Mark A. Cane; Randall J. Patton

1984-12-01T23:59:59.000Z

325

Multiscale Low-Frequency Circulation Modes in the Global Atmosphere  

Science Conference Proceedings (OSTI)

In this paper, fundamental multiscale circulation modes in the global atmosphere are identified with the objective of providing better understanding of atmospheric low-frequency variabilities over a wide range of spatial and temporal scales. With ...

K-M. Lau; P-J. Sheu; I-S. Kang

1994-05-01T23:59:59.000Z

326

Improve Motor System Efficiency with MotorMaster+, Software Tools for Industry, Industrial Technologies Program (ITP) (Fact Sheet)  

SciTech Connect

This fact sheet describes how the Industrial Technologies Program MotorMaster+ software tool aids industrial plants with finding energy-efficient motor replacement options and managing motor systems.

Not Available

2008-12-01T23:59:59.000Z

327

Electrostatic generator/motor configurations  

DOE Patents (OSTI)

Electrostatic generators/motors designs are provided that include a stator fixedly connected to a first central support centered about a central axis. The stator elements are attached to the first central support. Similarly, a second stator is connected to a central support centered about the central axis, and the second stator has stator elements attached to the second central support. A rotor is located between the first stator and the second stator and includes an outer support, where the rotor is rotatably centered about the central axis, the rotor having elements in contact with the outer support, each rotor element having an extending rotor portion that extends radially from the outer support toward the axis of rotation.

Post, Richard Freeman

2012-09-11T23:59:59.000Z

328

Honda motor company's CVCC engine  

DOE Green Energy (OSTI)

Honda Motor Company of Japan in a four-year period from 1968 to 1872 designed, tested, and mass-produced a stratified charge engine, the CVCC, which in comparison to conventional engines of similar output at the time was lower in CO, HC and NO/sub x/ emissions and higher in fuel economy. Honda developed the CVCC engine without government assistance or outside help. Honda's success came at a time when steadily increasing fuel costs and the various provisions of the Clean Air Act had forced US automakers to consider possible alternatives to the conventional gasoline engine. While most major engine manufacturers had investigated some form of stratified charge engine, Honda's CVCC was the only one to find successful market application. This case study examines the circumstances surrounding the development of the CVCC engine and its introduction into the Japanese and American markets.

Abernathy, W.J.; Ronan, L.

1980-07-01T23:59:59.000Z

329

Acura Acura Alfa Romeo Alfa Romeo American Motors Corporation...  

NLE Websites -- All DOE Office Websites (Extended Search)

Alfa Romeo Alfa Romeo American Motors Corporation American Motors Corporation Aston Martin Aston Martin Audi Audi Bertone Bertone BMW BMW Buick Buick Cadillac Cadillac Chevrolet...

330

Motor System Energy Efficiency Supply Curves: A Methodology for...  

NLE Websites -- All DOE Office Websites (Extended Search)

Motor System Energy Efficiency Supply Curves: A Methodology for Assessing the Energy Efficiency Potential of Industrial Motor Systems Speaker(s): Ali Hasanbeigi Date: February 8,...

331

Improve Motor Operation at Off-Design Voltages  

Science Conference Proceedings (OSTI)

This is one in a series of tip sheets to help manufacturers optimize their industrial motor and motor-driven systems.

Not Available

2008-07-01T23:59:59.000Z

332

Universal adaptive torque control for PM motors for field ...  

The invention includes a motor controller and method for controlling a permanent magnet motor. In accordance with one aspect of the present technique, a permanent ...

333

BPM Motors in Residential Gas Furnaces: What are the Savings?  

E-Print Network (OSTI)

Brushless Permanent Magnet (BPM) motor. Blowers account forIn a BPM motor the rotor contains permanent magnets. Themotors: Permanent Split Capacitor (PSC) and Brushless Permanent Magnet (

Lutz, James; Franco, Victor; Lekov, Alex; Wong-Parodi, Gabrielle

2006-01-01T23:59:59.000Z

334

Ameren Illinois (Electric) - Custom, HVAC, and Motor Business...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Ameren Illinois (Electric) - Custom, HVAC, and Motor Business Efficiency Incentives Ameren Illinois (Electric) - Custom, HVAC, and Motor Business Efficiency Incentives < Back...

335

DOE - Office of Legacy Management -- General Motors Co - Flint...  

Office of Legacy Management (LM)

Motors Co - Flint - MI 07 FUSRAP Considered Sites Site: GENERAL MOTORS CO. (MI.07 ) Eliminated from further consideration under FUSRAP Designated Name: Not Designated Alternate...

336

Desenvolvimento experimental de um motor stirling tipo gama.  

E-Print Network (OSTI)

??O presente trabalho consiste no desenvolvimento experimental de um motor Stirling tipo gama. So apresentadas inicialmente as diferentes configuraes deste tipo de motor (alfa, gama (more)

Vinicius Guimares da Cruz

2012-01-01T23:59:59.000Z

337

Vision Industries dba Vision Motor Corp | Open Energy Information  

Open Energy Info (EERE)

Vision Motor Corp) Place Santa Monica, California Zip 90405 Product Santa Monica-based electric vehicle manufacturer. References Vision Industries (dba Vision Motor Corp)1...

338

When Should Inverter-Duty Motors Be Specified?  

SciTech Connect

This is one in a series of tip sheets to help manufacturers optimize their industrial motor and motor-driven systems.

Not Available

2008-07-01T23:59:59.000Z

339

Minimize Adverse Motor and Adjustable Speed Drive Interactions  

SciTech Connect

This is one in a series of tip sheets to help manufacturers optimize their industrial motor and motor-driven systems.

Not Available

2008-07-01T23:59:59.000Z

340

Improving Motor and Drive System Performance: A Sourcebook for Industry  

SciTech Connect

This is one in a series of sourcebooks to assist industrial personnel in understanding and optimizing motors and motor-driven systems

Not Available

2008-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Quantum teleportation of optical images with frequency conversion  

E-Print Network (OSTI)

We describe a new version of continuous variables quantum holographic teleportation of optical images. Unlike the previously proposed scheme, it is based on the continuous variables quantum entanglement between the light fields of different frequencies and allows for the wavelength conversion between the original and the teleported images. The frequency tunable holographic teleportation protocol can be used as a part of light-matter interface in parallel quantum information processing and parallel quantum memory

Liubov V. Magdenko; Ivan V. Sokolov; Mikhail I. Kolobov

2006-02-24T23:59:59.000Z

342

primary frequency standards  

Science Conference Proceedings (OSTI)

NIST-F1 Cesium Fountain Atomic Clock The Primary Time and Frequency Standard for the United States. NIST-F1, the nation's ...

2013-02-04T23:59:59.000Z

343

Developing a Motor Management Policy at BASF  

E-Print Network (OSTI)

In early 1998 Thomas R. Theising, BASF Corporate Engineering initiated the formation of a motor management team. The goal of the team was to develop a Motor Management Guideline to better manage the purchase and repair of motors used throughout the company. BASF draws a 240MW electrical power load. Accepting that 70% (industry standards range from 63 to 75% for BASF's businesses) of this load was consumed by rotating equipment and assuming an average cost of$401MWh at 8400 hours of annual operation BASF spends over $56M annually to operate electric motors. A guideline to better manage the purchase and repair of these motors could reduce this operating cost by 3 to 5%, which translates to $1.7M to $2.8M annually. An estimated total cost to BASF for implementation is $200K. The development of a Motor Management Guideline required the cooperative effort of a team of individuals. This team consisted of representatives from several BASF manufacturing locations, Corporate Engineering, Corporate Purchasing and Energy Management. Also, BASF included representatives from Duke Power and from Advanced Energy (AE). Advanced Energy had previously provided motor testing services to the BASF facility in Enka, NC.

Zickefoose, B.; Theising, T. R.

2001-05-01T23:59:59.000Z

344

Gas Mileage of 1984 Vehicles by American Motors Corporation  

NLE Websites -- All DOE Office Websites (Extended Search)

4 American Motors Corporation Vehicles 4 American Motors Corporation Vehicles EPA MPG MODEL City Comb Hwy 1984 American Motors Corporation Eagle 4WD 4 cyl, 2.5 L, Manual 4-spd, Regular Gasoline Compare 1984 American Motors Corporation Eagle 4WD 19 City 20 Combined 22 Highway 1984 American Motors Corporation Eagle 4WD 4 cyl, 2.5 L, Manual 5-spd, Regular Gasoline Compare 1984 American Motors Corporation Eagle 4WD 19 City 21 Combined 23 Highway 1984 American Motors Corporation Eagle 4WD 6 cyl, 4.2 L, Automatic 3-spd, Regular Gasoline Compare 1984 American Motors Corporation Eagle 4WD 15 City 17 Combined 20 Highway 1984 American Motors Corporation Eagle 4WD 6 cyl, 4.2 L, Manual 4-spd, Regular Gasoline Compare 1984 American Motors Corporation Eagle 4WD 16 City 17 Combined 20 Highway 1984 American Motors Corporation Eagle 4WD 6 cyl, 4.2 L, Manual 5-spd, Regular Gasoline

345

Discrimination among mechanical fault types in induction motors using electrical measurements  

E-Print Network (OSTI)

Rotating machine failures are a major cause of downtime in a wide variety of industrial processes and are a burden on maintenance personnel and facilities. Some of these failures occur suddenly and are seemingly unpredictable. However, the overwhelming majority develop slowly over time and produce characteristic warning signs. A system capable of detecting and diagnosing these incipient faults before they become critical would significantly reduce downtime and serve to facilitate maintenance and repair of these machines. The ability to accurately distinguish between different types of incipient faults would be a critical aspect of such a system. In this research, a model-based method for diagnosing motor faults is examined and tested using two squirrel-cage AC induction motors with staged fault conditions. The proposed method involves the multi-resolution signal analysis of the current residuals. These residuals are generated by comparing the measured motor current with the current predicted by a recurrent neural network. The frequency content of the distortion of the residuals is used to identify the type of fault present. Although "steady-state" conditions are examined exclusively in this research, the nonstationarities of the current signals are sufficient to warrant the use of multi-resolution analysis. The fault diagnosis system is tested using data taken from an 800 hp motor and a 3 hp motor. The method is successful in identifying residual distortion in the frequency range expected for broken-bar faults. Because the magnitude of the distortion grows with increasing fault severity, the method is also useful for evaluating fault severity for broken-bar faults. However, the current distortions caused by rotor eccentricities and damaged bearings are too small to be identified in a statistically significant manner using this approach. Nevertheless, this research demonstrates the feasibility of a general method by which the characteristic frequencies produced by a particular type of fault can be identified in the output of a system.

McFatter, Justin Robert

2002-01-01T23:59:59.000Z

346

List of Motors Incentives | Open Energy Information  

Open Energy Info (EERE)

Incentives Incentives Jump to: navigation, search The following contains the list of 371 Motors Incentives. CSV (rows 1 - 371) Incentive Incentive Type Place Applicable Sector Eligible Technologies Active AEP (Central and North) - CitySmart Program (Texas) Utility Rebate Program Texas Commercial Industrial Institutional Local Government Schools Boilers Central Air conditioners Chillers Comprehensive Measures/Whole Building Custom/Others pending approval Energy Mgmt. Systems/Building Controls Furnaces Heat pumps Lighting Lighting Controls/Sensors Motor VFDs Motors Roofs Windows Yes AEP (Central, North and SWEPCO) - Commercial Solutions Program (Texas) Utility Rebate Program Texas Commercial Industrial Institutional Local Government Nonprofit Schools State Government Tribal Government Boilers

347

Direct torque control of permanent magnet synchronous motors with non-sinusoidal back-EMF  

E-Print Network (OSTI)

This work presents the direct torque control (DTC) techniques, implemented in four- and six-switch inverter, for brushless dc (BLDC) motors with non-sinusoidal back- EMF using two and three-phase conduction modes. First of all, the classical direct torque control of permanent magnet synchronous motor (PMSM) with sinusoidal back-EMF is discussed in detail. Secondly, the proposed two-phase conduction mode for DTC of BLDC motors is introduced in the constant torque region. In this control scheme, only two phases conduct at any instant of time using a six-switch inverter. By properly selecting the inverter voltage space vectors of the two-phase conduction mode from a simple look-up table the desired quasi-square wave current is obtained. Therefore, it is possible to achieve DTC of a BLDC motor drive with faster torque response while the stator flux linkage amplitude is deliberately kept almost constant by ignoring the flux control in the constant torque region. Third, the avarege current controlled boost power factor correction (PFC) method is applied to the previously discussed proposed DTC of BLDC motor drive in the constant torque region. The test results verify that the proposed PFC for DTC of BLDC motor drive improves the power factor from 0.77 to about 0.9997 irrespective of the load. Fourth, the DTC technique for BLDC motor using four-switch inverter in the constant torque region is studied. For effective torque control in two phase conduction mode, a novel switching pattern incorporating the voltage vector look-up table is designed and implemented for four-switch inverter to produce the desired torque characteristics. As a result, it is possible to achieve two-phase conduction DTC of a BLDC motor drive using four-switch inverter with faster torque response due to the fact that the voltage space vectors are directly controlled.. Finally, the position sensorless direct torque and indirect flux control (DTIFC) of BLDC motor with non-sinusoidal back-EMF has been extensively investigated using three-phase conduction scheme with six-switch inverter. In this work, a novel and simple approach to achieve a low-frequency torque ripple-free direct torque control with maximum efficiency based on dq reference frame similar to permanent magnet synchronous motor (PMSM) drives is presented.

Ozturk, Salih Baris

2008-05-01T23:59:59.000Z

348

Sensorless Speed Control of Permanent Magnet-Assisted Synchronous Reluctance Motor (PMa-SynRM)  

E-Print Network (OSTI)

An interesting alternative for today's high efficiency variable speed drives is the Permanent Magnet-Assisted Synchronous Reluctance Motor drive, which belongs to the family of brushless synchronous AC motor drives. Generally, the reluctance torque of this motor is significant compared to the Permanent Magnet electrical torque. The advantage of increased reluctance torque is the decreased need of expensive permanent magnet (PM) material, which makes this solution thus cheaper than the respective permanent magnet motor. Also due to its synchronous operation, sensorless rotational control is possible along with higher power factor and better efficiency compared to the induction motor (IM). Therefore, this thesis first deals with the implementation of a vector control strategy for speed control of the PMa-synRM motor that can be applied to a washing machine application. The machine is supplied by a current controlled voltage source PWM inverter to control the instantaneous stator currents which are decided by the reference speed. Secondly, the thesis focuses on the sensorless speed operation of the PMa-SynRM to take advantage of the lower costs as well as increased system reliability which otherwise is not possible using the delicate speed or position sensors. The concept involves estimation of the rotor speed and/or position. There are several speed estimation techniques proposed by researchers and among them the observer based technique is proven and commonly used in the industry. The only requirements of the observer system are a very fast signal processor, specialized and optimized to perform complex mathematical calculations. The feasibility and effectiveness of the control techniques are verified using the experimental results, implemented using the Texas Instruments TMS320F2812 eZDSP controller board and the overall motor drive system in the laboratory.

Chakali, Anil K.

2009-12-01T23:59:59.000Z

349

Not a Babe in the Woods: Using MotorMaster Software to Make Sophisticated Electric Motor Purchase Decisions  

E-Print Network (OSTI)

Three-phase motors use more than half of all electricity in the United States. Energy efficient models are available in most motor classes in the 1 to 500 horsepower range, offering simple pay backs under two years. In practice, few motor buyers have performed an economic analysis, resulting in missed energy and dollar savings. MotorMaster software helps identify the best motor for a specific application. Its database of 9,000 motors includes the majority of three-phase motors sold in the United State. Performance information such as Full-Load RPM, torque and amperage rating identify models that meet specific design criteria. MotorMaster calculates operating costs and simple paybacks. This paper reviews the importance of proper electric motor selection and explains how MotorMaster software can be used to identify the most efficient, cost effective and reliable motor for each specific application.

Litman, T.

1993-03-01T23:59:59.000Z

350

Stabilized radio frequency quadrupole  

DOE Patents (OSTI)

Disclosed is a long-vane stabilized radio frequency resonator for accelerating charged particles and including means defining a radio frequency resonator cavity, a plurality of long vanes mounted in the defining means for dividing the cavity into sections, and means interconnecting opposing ones of the plurality of vanes for stabilizing the resonator. 5 figs.

Lancaster, H.D.; Fugitt, J.A.; Howard, D.R.

1984-12-25T23:59:59.000Z

351

Estimating frequency of change  

Science Conference Proceedings (OSTI)

Many online data sources are updated autonomously and independently. In this article, we make the case for estimating the change frequency of data to improve Web crawlers, Web caches and to help data mining. We first identify various scenarios, where ... Keywords: Change frequency estimation, Poisson process

Junghoo Cho; Hector Garcia-Molina

2003-08-01T23:59:59.000Z

352

Report on Toyota Prius Motor Thermal Management  

DOE Green Energy (OSTI)

In the current hybrid vehicle market, the Toyota Prius drive system is considered the leader in electrical, mechanical, and manufacturing innovations. It is a significant accomplishment that Toyota is able to manufacture and sell the vehicle for a profit. The Toyota Prius traction motor design approach for reducing manufacturing costs and the motor s torque capability have been studied and tested. The findings were presented in two previous Oak Ridge National Laboratory (ORNL) reports. The conclusions from this report reveal, through temperature rise tests, that the 2004 Toyota Prius (THSII) motor is applicable only for use in a hybrid automobile. It would be significantly undersized if used in a fuel cell vehicle application. The power rating of the Prius motor is limited by the permissible temperature rise of the motor winding (170 C) and the motor cooling oil (158 C). The continuous ratings at base speed (1200 rpm) with different coolant temperatures are projected from test data at 900 rpm. They are approximately 15 kW with 105 C coolant and 21 kW with 35 C coolant. These continuous ratings are much lower than the 30 kW specified as a technical motor target of the U.S. Department of Energy FreedomCAR Program. All tests were conducted at about 24 C ambient temperature. The load angle of each torque adjustment was monitored to prevent a sudden stop of the motor if the peak torque were exceeded, as indicated by the load angle in the region greater than 90 electrical degrees. For peak power with 400 Nm torque at 1200 rpm, the permissible running time depends upon the initial winding temperature condition. The projected rate of winding temperature rise is approximately 2.1 C/sec. The cooling-oil temperature does not change much during short peak power operation. For light and medium load situations, the efficiency varies from 80% to above 90%, and the power factor varies from 70% to above 90%, depending on the load and speed. When the motor is loaded heavily near the peak-torque (400-Nm) region, the efficiency goes down to the 40-50% range, and the power factor is nearly 100%. The efficiency is not a major concern at the high-torque region. The water-ethylene-glycol heat exchanger attached to the motor is small. During continuous operation, it dissipates about 76% of the total motor heat loss with 35 C coolant. The heat exchanger is less effective when the coolant temperature increases. With 75 C coolant, the heat exchanger dissipates about 38% of the motor heat. When the coolant temperature is 105 C, the heat exchanger not only stops cooling the motor but also adds heat to the large motor housing that acts as an air-cooled heat sink. From start to the base speed, 400 Nms of torque can be produced by the Prius motor with a reasonably low stator current. However, the permissible running time of the motor depends on the load drawn from the motor and the coolant temperature. In the Toyota Prius hybrid configuration, if the motor gets too hot and cannot keep running, the load can be shifted back to the engine. The motor acts to improve the system efficiency without being overly designed. A detailed thermal model was developed to help predict the temperature levels in key motor components. The model was calibrated and compared with the experimentally measured temperatures. Very good agreement was obtained between model and experiment. This model can now be used to predict the temperature of key motor components at a variety of operating conditions and to evaluate the thermal characteristics of new motor designs. It should be pointed out that a fuel-cell motor does not have an engine to fall back on to provide the needed wheel power. Therefore, the design philosophy of a fuel-cell motor is very different from that of a hybrid Prius motor. Further thermal management studies in the high-speed region of the Prius motor, fed by its inverter, are planned.

Hsu, J.S.

2005-02-11T23:59:59.000Z

353

Understanding Inertial and Frequency Response of Wind Power Plants: Preprint  

DOE Green Energy (OSTI)

The objective of this paper is to analyze and quantify the inertia and frequency responses of wind power plants with different wind turbine technologies (particularly those of fixed speed, variable slip with rotor-resistance controls, and variable speed with vector controls).

Muljadi, E.; Gevorgian, V.; Singh, M.; Santoso, S.

2012-07-01T23:59:59.000Z

354

Microfabricated ion frequency standard  

DOE Patents (OSTI)

A microfabricated ion frequency standard (i.e. an ion clock) is disclosed with a permanently-sealed vacuum package containing a source of ytterbium (Yb) ions and an octupole ion trap. The source of Yb ions is a micro-hotplate which generates Yb atoms which are then ionized by a ultraviolet light-emitting diode or a field-emission electron source. The octupole ion trap, which confines the Yb ions, is formed from suspended electrodes on a number of stacked-up substrates. A microwave source excites a ground-state transition frequency of the Yb ions, with a frequency-doubled vertical-external-cavity laser (VECSEL) then exciting the Yb ions up to an excited state to produce fluorescent light which is used to tune the microwave source to the ground-state transition frequency, with the microwave source providing a precise frequency output for the ion clock.

Schwindt, Peter (Albuquerque, NM); Biedermann, Grant (Albuquerque, NM); Blain, Matthew G. (Albuquerque, NM); Stick, Daniel L. (Albuquerque, NM); Serkland, Darwin K. (Albuquerque, NM); Olsson, III, Roy H. (Albuquerque, NM)

2010-12-28T23:59:59.000Z

355

Fluctuating-friction molecular motors  

E-Print Network (OSTI)

We show that the correlated stochastic fluctuation of the friction coefficient can give rise to long-range directional motion of a particle undergoing Brownian random walk in a constant periodic energy potential landscape. The occurrence of this motion requires the presence of two additional independent bodies interacting with the particle via friction and via the energy potential, respectively, which can move relative to each other. Such three-body system generalizes the classical Brownian ratchet mechanism, which requires only two interacting bodies. In particular, we describe a simple two-level model of fluctuating-friction molecular motor that can be solved analytically. In our previous work [M.K., L.M and D.P. 2000 J. Nonlinear Opt. Phys. Mater. vol. 9, 157] this model has been first applied to understanding the fundamental mechanism of the photoinduced reorientation of dye-doped liquid crystals. Applications of the same idea to other fields such as molecular biology and nanotechnology can however be envisioned. As an example, in this paper we work out a model of the actomyosin system based on the fluctuating-friction mechanism.

Lorenzo Marrucci; Domenico Paparo; Markus Kreuzer

2001-10-12T23:59:59.000Z

356

Motor vehicles and global warming  

SciTech Connect

Energy use in transportation is one of the contributors to the concern over global warming. The primary greenhouse gases released by the transportation sector are carbon dioxide and chlorofluorocarbons. When all greenhouse gases are considered, CO{sub 2} emissions from the operation of highway vehicles worldwide represent about 4.7% of global warming enhancement. CO{sub 2} emissions from U.S. highway vehicles along represent about 2 to 2.5% of worldwide greenhouse gases. The use of CFCs in automotive air conditioning, in blowing foams for seats and padding and in the manufacture of electronic circuit boards accounted for 15% of the global usage of CFC-12 in 1985 according to the U.S. EPA. The Motor Vehicle Manufacturers Association supports the phase-out of CFC use provided that safe substitutes are available and that adequate lead time is allowed for.They suggest that reduction of greenhouse gases would require planning on a global scope to be effective. One alternative they suggest for further study is a carbon fee for reducing emissions of carbon dioxide. This fee would be levied on each type of fossil fuel, proportional to its carbon content per unit of energy.

Halberstadt, M.L.

1990-03-01T23:59:59.000Z

357

The Paris Motor Show | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Paris Motor Show Paris Motor Show The Paris Motor Show October 4, 2010 - 9:39am Addthis David Sandalow at the Paris Auto Show | DOE photo David Sandalow at the Paris Auto Show | DOE photo David Sandalow David Sandalow Former Under Secretary of Energy (Acting) and Assistant Secretary for Policy & International Affairs At the Paris Motor Show today, electric cars are everywhere. Chevrolet is showing off the Volt, its plug-in hybrid due in U.S. showrooms this December. (Motown music blared as a Chevy rep told me all about the car's performance.) Nissan is displaying the Leaf, its all-electric sedan scheduled to roll off assembly lines in Tennessee starting in 2012. Volvo has new plug-in models. So do Saab, Peugot and other European manufacturers. And as I walked through the gates in a huge crowd, the first

358

The Paris Motor Show | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

The Paris Motor Show The Paris Motor Show The Paris Motor Show October 4, 2010 - 9:39am Addthis David Sandalow at the Paris Auto Show | DOE photo David Sandalow at the Paris Auto Show | DOE photo David Sandalow David Sandalow Former Under Secretary of Energy (Acting) and Assistant Secretary for Policy & International Affairs At the Paris Motor Show today, electric cars are everywhere. Chevrolet is showing off the Volt, its plug-in hybrid due in U.S. showrooms this December. (Motown music blared as a Chevy rep told me all about the car's performance.) Nissan is displaying the Leaf, its all-electric sedan scheduled to roll off assembly lines in Tennessee starting in 2012. Volvo has new plug-in models. So do Saab, Peugot and other European manufacturers. And as I walked through the gates in a huge crowd, the first

359

Motor Wave Group | Open Energy Information  

Open Energy Info (EERE)

Wave Group Jump to: navigation, search Name Motor Wave Group Place Hong Kong Sector Marine and Hydrokinetic Website http:www.motorwavegroup.com Region China LinkedIn Connections...

360

Dynamic Phase Transitions in Coupled Motor Proteins  

E-Print Network (OSTI)

The effect of interactions on dynamics of coupled motor proteins is investigated theoretically. A simple stochastic discrete model, that allows to calculate explicitly the dynamic properties of the system, is developed. It is shown that there are two dynamic regimes, depending on the interaction between the particles. For strong interactions the motor proteins move as one tight cluster, while for weak interactions there is no correlation in the motion of the proteins, and the particle separation increases steadily with time. The boundary between two dynamic phases is specified by a critical interaction that has a non-zero value only for the coupling of the asymmetric motor proteins, and it depends on the temperature and the transitions rates. At the critical interaction there is a change in a slope for the mean velocities and a discontinuity in the dispersions of the motor proteins as a function of the interaction energy.

Evgeny B. Stukalin; Anatoly B. Kolomeisky

2005-09-16T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Isolated Multiple Flux Path (IMFP) Reluctance Motors  

2 Managed by UT-Battelle for the U.S. Department of Energy Overview IMFP reluctance electric motor developed for passenger vehicle propulsion (i.e. small trucks ...

362

Modeling and optimization of permanent magnetic motors  

E-Print Network (OSTI)

This thesis develops analytic models for the prediction and optimization of radial-flux permanent magnet motor torque and efficiency. It also facilitates the design optimization of electromagnetically-powered rotorcraft ...

Pinkham, Andrew P

2008-01-01T23:59:59.000Z

363

A University of Alabama Axial-Gap Electric Motor Developmenty  

E-Print Network (OSTI)

­ Develop axial gap permanent-magnet electric Axial motor ­ Develop axial gap permanent-magnet electricCAVT A University of Alabama Axial-Gap Electric Motor Developmenty Research Center OBJECTIVE motor topologies with high torque and power densities MOTIVATION ­ Axial-gap ("pancake") motors have

Carver, Jeffrey C.

364

Motor transport of self-assembled cargos in crowded environments  

E-Print Network (OSTI)

Motor transport of self-assembled cargos in crowded environments Leslie Conwaya , Derek Woodb is performed by multiple motors working in concert. However, the mechanism of motor association to cargos is unknown. It is also unknown how long individual motors stay attached, how many are active, and how

Ross, Jennifer

365

Colorado Finished Motor Gasoline Stocks at Refineries, Bulk ...  

U.S. Energy Information Administration (EIA)

Colorado Finished Motor Gasoline Stocks at Refineries, Bulk Terminals, and Natural Gas Plants (Thousand Barrels)

366

Michigan Finished Motor Gasoline Stocks at Refineries, Bulk ...  

U.S. Energy Information Administration (EIA)

Michigan Finished Motor Gasoline Stocks at Refineries, Bulk Terminals, and Natural Gas Plants (Thousand Barrels)

367

Development of a gross motor task to assess motor planning of children with autism spectrum disorders.  

E-Print Network (OSTI)

??Motor planning was assessed by performance of 10 male children (age range 9-12 years) with ASD on a simple obstacle course of horizontal barriers. The (more)

Staples, Kerri.

2005-01-01T23:59:59.000Z

368

ORIGINAL ARTICLE Low Motor Assessment: A Comparative Pilot Study with Young Children With and Without Motor  

E-Print Network (OSTI)

# The Author(s) 2009. This article is published with open access at Springerlink.com Abstract Most of the developmental instruments that measure cognitive development in children rely heavily on fine motor skills, especially for young children whose language skills are not yet well developed. This is problematic when evaluating the cognitive development of young children with motor impairment. The purpose of this study is to assess the need for a Low Motor adapation of a standardized instrument when testing children with motor impairment. To accomplish this, we have adapted the procedures, item instructions and play material of a widely used and standardized instrument, the Bayley Scales of Infant Development-Second Edition (BSID-II, Bayley 1993). The Original and the Low Motor versions were administered to 20 children experiencing typical development and 19 children with motor impairment within a period of two weeks. Results showed that children with motor impairments scored significantly higher on the Low Motor version of the Bayley Mental Scale than on the Original version: a difference of between 5 and 10 points when the score is expressed in terms of a developmental index score. Results from children with typical development support the assumption that item content and difficulty remain unchanged in the Low Motor version.

J Dev Phys Disabil; Selma Anne; Jos Ruiter; Han Nakken; Bieuwe F. Van Der Meulen; Carolien B. Lunenborg

2009-01-01T23:59:59.000Z

369

DC Motor control using motor-generator set with controlled generator field  

DOE Patents (OSTI)

A d.c. generator is connected in series opposed to the polarity of a d.c. power source supplying a d.c. drive motor. The generator is part of a motor-generator set, the motor of which is supplied from the power source connected to the motor. A generator field control means varies the field produced by at least one of the generator windings in order to change the effective voltage output. When the generator voltage is exactly equal to the d.c. voltage supply, no voltage is applied across the drive motor. As the field of the generator is reduced, the drive motor is supplied greater voltage until the full voltage of the d.c. power source is supplied when the generator has zero field applied. Additional voltage may be applied across the drive motor by reversing and increasing the reversed field on the generator. The drive motor may be reversed in direction from standstill by increasing the generator field so that a reverse voltage is applied across the d.c. motor.

Belsterling, Charles A. (Norristown, PA); Stone, John (Medford, NJ)

1982-01-01T23:59:59.000Z

370

Trapped field internal dipole superconducting motor generator  

DOE Patents (OSTI)

A motor generator including a high temperature superconductor rotor and an internally disposed coil assembly. The motor generator superconductor rotor is constructed of a plurality of superconductor elements magnetized to produce a dipole field. The coil assembly can be either a conventional conductor or a high temperature superconductor. The superconductor rotor elements include a magnetization direction and c-axis for the crystals of the elements and which is oriented along the magnetization direction.

Hull, John R. (Downers Grove, IL)

2001-01-01T23:59:59.000Z

371

ac-driven atomic quantum motor  

E-Print Network (OSTI)

We invent an ac-driven quantum motor consisting of two different, interacting ultracold atoms placed into a ring-shaped optical lattice and submerged in a pulsating magnetic field. While the first atom carries a current, the second one serves as a quantum starter. For fixed zero-momentum initial conditions the asymptotic carrier velocity converges to a unique non-zero value. We also demonstrate that this quantum motor performs work against a constant load.

A. V. Ponomarev; S. Denisov; P. Hanggi

2009-02-03T23:59:59.000Z

372

ac-driven atomic quantum motor  

E-Print Network (OSTI)

We invent an ac-driven quantum motor consisting of two different, interacting ultracold atoms placed into a ring-shaped optical lattice and submerged in a pulsating magnetic field. While the first atom carries a current, the second one serves as a quantum starter. For fixed zero-momentum initial conditions the asymptotic carrier velocity converges to a unique non-zero value. We also demonstrate that this quantum motor performs work against a constant load.

Ponomarev, A V; Hnggi, P

2009-01-01T23:59:59.000Z

373

Control of Surface Mounted Permanent Magnet Motors with Special Application to Fractional-Slot Motors with Concentrated Windings  

SciTech Connect

A 30 pole, 6 kW, and 6000 maximum revolutions per minute (rpm) prototype of the permanent magnet synchronous motor (PMSM) with fractional-slot concentrated windings (FSCW) has been designed, built, and tested at the University of Wisconsin at Madison (UWM). This machine has significantly more inductance than that of regular PMSMs. The prototype was delivered in April 2006 to the Oak Ridge National Laboratory (ORNL) for testing and development of a controller that will achieve maximum efficiency. In advance of the test/control development effort, ORNL has used the PMSM models developed over a number of previous studies to study how steady state performance of high inductance PMSM machines relates to control issues. This report documents the results of this research. The amount of inductance that enables the motor to achieve infinite constant power speed ratio (CPSR) is given by L{sub {infinity}} = E{sub b}/{Omega}{sub b}I{sub R}, where E{sub b} is the root-mean square (rms) magnitude of the line-to-neutral back-electromotive force (emf) at base speed, {Omega}{sub b} is the base speed in electrical radians per second, and I{sub R} is the rms current rating of the motor windings. The prototype machine that was delivered to ORNL has about 1.5 times as much inductance as a typical PMSM with distributed integral slot windings. The inventors of the FSCW method, who designed the prototype machine, remarked that they were 'too successful' in incorporating inductance into their machine and that steps would be taken to modify the design methodology to reduce the inductance to the optimum value. This study shows a significant advantage of having the higher inductance rather than the optimal value because it enables the motor to develop the required power at lower current thereby reducing motor and inverter losses and improving efficiency. The main problem found with high inductance machines driven by a conventional phase advance (CPA) method is that the motor current at high speed depends solely on machine parameters and is virtually independent of the load level and the direct current (dc) supply voltage. Thus, the motor current is virtually the same at no load as at full load resulting in poor efficiency at less than full load conditions. While an inductance higher than the value cited above is warranted, it still does not ensure that the motor current is proportional to load; consequently, the problem of low efficiency at high speed and partial load is not resolved but is only mitigated. A common definition of 'base speed' is the speed at which the voltage applied to the motor armature is equal to the magnitude of the back-emf. The results in this study indicate that the dc supply voltage should be adequate to drive rated current into the motor winding at the specified base speed. At a minimum this requires sufficient voltage to overcome not only the back-emf but also the voltage drop across the internal impedance of the machine. For a high inductance PMSM, the internal impedance at base speed can be considerable and substantial additional voltage is required to overcome the internal voltage drop. It is further shown that even more voltage than the minimum required for injecting rated current at base speed can be beneficial by allowing the required power to be developed at lower current, which reduces losses in the motor and inverter components. Further, it is shown that the current is minimized at a unique speed; consequently, there may be room for optimization if the drive spends a substantial amount of its operating life at a certain speed (for example 60 mph). In this study, fundamental frequency phasor models are developed for a synchronous PMSM and the control systems that drive them is CPA. The models were compared with detailed simulations to show their validity. The result was used to design a traction drive control system with optimized efficiency to drive the fractional-slot motor with concentrated windings. The goal is to meet or exceed the FreedomCAR inverter cost and performance targets.

McKeever, John W [ORNL; Patil, Niranjan [University of Tennessee, Knoxville (UTK); Lawler, Jack [ORNL

2007-07-01T23:59:59.000Z

374

Control of Surface Mounted Permanent Magnet Motors with Special Application to Fractional-Slot Motors with Concentrated Windings  

SciTech Connect

A 30 pole, 6 kW, and 6000 maximum revolutions per minute (rpm) prototype of the permanent magnet synchronous motor (PMSM) with fractional-slot concentrated windings (FSCW) has been designed, built, and tested at the University of Wisconsin at Madison (UWM). This machine has significantly more inductance than that of regular PMSMs. The prototype was delivered in April 2006 to the Oak Ridge National Laboratory (ORNL) for testing and development of a controller that will achieve maximum efficiency. In advance of the test/control development effort, ORNL has used the PMSM models developed over a number of previous studies to study how steady state performance of high inductance PMSM machines relates to control issues. This report documents the results of this research. The amount of inductance that enables the motor to achieve infinite constant power speed ratio (CPSR) is given by L{sub {infinity}} = E{sub b}/{Omega}{sub b}I{sub R}, where E{sub b} is the root-mean square (rms) magnitude of the line-to-neutral back-electromotive force (emf) at base speed, {Omega}{sub b} is the base speed in electrical radians per second, and I{sub R} is the rms current rating of the motor windings. The prototype machine that was delivered to ORNL has about 1.5 times as much inductance as a typical PMSM with distributed integral slot windings. The inventors of the FSCW method, who designed the prototype machine, remarked that they were 'too successful' in incorporating inductance into their machine and that steps would be taken to modify the design methodology to reduce the inductance to the optimum value. This study shows a significant advantage of having the higher inductance rather than the optimal value because it enables the motor to develop the required power at lower current thereby reducing motor and inverter losses and improving efficiency. The main problem found with high inductance machines driven by a conventional phase advance (CPA) method is that the motor current at high speed depends solely on machine parameters and is virtually independent of the load level and the direct current (dc) supply voltage. Thus, the motor current is virtually the same at no load as at full load resulting in poor efficiency at less than full load conditions. While an inductance higher than the value cited above is warranted, it still does not ensure that the motor current is proportional to load; consequently, the problem of low efficiency at high speed and partial load is not resolved but is only mitigated. A common definition of 'base speed' is the speed at which the voltage applied to the motor armature is equal to the magnitude of the back-emf. The results in this study indicate that the dc supply voltage should be adequate to drive rated current into the motor winding at the specified base speed. At a minimum this requires sufficient voltage to overcome not only the back-emf but also the voltage drop across the internal impedance of the machine. For a high inductance PMSM, the internal impedance at base speed can be considerable and substantial additional voltage is required to overcome the internal voltage drop. It is further shown that even more voltage than the minimum required for injecting rated current at base speed can be beneficial by allowing the required power to be developed at lower current, which reduces losses in the motor and inverter components. Further, it is shown that the current is minimized at a unique speed; consequently, there may be room for optimization if the drive spends a substantial amount of its operating life at a certain speed (for example 60 mph). In this study, fundamental frequency phasor models are developed for a synchronous PMSM and the control systems that drive them is CPA. The models were compared with detailed simulations to show their validity. The result was used to design a traction drive control system with optimized efficiency to drive the fractional-slot motor with concentrated windings. The goal is to meet or exceed the FreedomCAR inverter cost and performance targets.

McKeever, John W [ORNL; Patil, Niranjan [University of Tennessee, Knoxville (UTK); Lawler, Jack [ORNL

2007-07-01T23:59:59.000Z

375

Alternative Fuels Data Center: Alternative Fuel Motor Carrier Fuel Tax  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Fuel Motor Fuel Motor Carrier Fuel Tax to someone by E-mail Share Alternative Fuels Data Center: Alternative Fuel Motor Carrier Fuel Tax on Facebook Tweet about Alternative Fuels Data Center: Alternative Fuel Motor Carrier Fuel Tax on Twitter Bookmark Alternative Fuels Data Center: Alternative Fuel Motor Carrier Fuel Tax on Google Bookmark Alternative Fuels Data Center: Alternative Fuel Motor Carrier Fuel Tax on Delicious Rank Alternative Fuels Data Center: Alternative Fuel Motor Carrier Fuel Tax on Digg Find More places to share Alternative Fuels Data Center: Alternative Fuel Motor Carrier Fuel Tax on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Alternative Fuel Motor Carrier Fuel Tax Effective January 1, 2014, a person who operates a commercial motor vehicle

376

Halbach array DC motor/generator  

DOE Patents (OSTI)

A new configuration of DC motor/generator is based on a Halbach array of permanent magnets. This motor does not use ferrous materials so that the only losses are winding losses and losses due to bearings and windage. An ``inside-out`` design is used as compared to a conventional motor/generator design. The rotating portion, i.e., the rotor, is on the outside of the machine. The stationary portion, i.e., the stator, is formed by the inside of the machine. The rotor contains an array of permanent magnets that provide a uniform field. The windings of the motor are placed in or on the stator. The stator windings are then ``switched`` or ``commutated`` to provide a DC motor/generator much the same as in a conventional DC motor. The commutation can be performed by mechanical means using brushes or by electronic means using switching circuits. The invention is useful in electric vehicles and adjustable speed DC drives. 17 figs.

Merritt, B.T.; Dreifuerst, G.R.; Post, R.F.

1998-01-06T23:59:59.000Z

377

Halbach array DC motor/generator  

DOE Patents (OSTI)

A new configuration of DC motor/generator is based on a Halbach array of permanent magnets. This motor does not use ferrous materials so that the only losses are winding losses and losses due to bearings and windage. An "inside-out" design is used as compared to a conventional motor/generator design. The rotating portion, i.e., the rotor, is on the outside of the machine. The stationary portion, i.e., the stator, is formed by the inside of the machine. The rotor contains an array of permanent magnets that provide a uniform field. The windings of the motor are placed in or on the stator. The stator windings are then "switched" or "commutated" to provide a DC motor/generator much the same as in a conventional DC motor. The commutation can be performed by mechanical means using brushes or by electronic means using switching circuits. The invention is useful in electric vehicles and adjustable speed DC drives.

Merritt, Bernard T. (Livermore, CA); Dreifuerst, Gary R. (Livermore, CA); Post, Richard F. (Walnut Creek, CA)

1998-01-01T23:59:59.000Z

378

Intraseasonal Variability in a Barotropic Model with Seasonal Forcing  

Science Conference Proceedings (OSTI)

It has recently been suggested that oscillatory topographic instability could contribute to low-frequency variability over the Northern Hemisphere midlatitudes. A barotropic potential vorticity model, with a hierarchy of forcing and topography ...

Christopher M. Strong; Fei-Fei Jin; Michael Ghil

1993-09-01T23:59:59.000Z

379

Climatology and Interannual Variability of North Atlantic Hurricane Tracks  

Science Conference Proceedings (OSTI)

The spatial and temporal variability of North Atlantic hurricane tracks and its possible association with the annual hurricane landfall frequency along the U.S. East Coast are studied using principal component analysis (PCA) of hurricane track ...

Lian Xie; Tingzhuang Yan; Leonard J. Pietrafesa; John M. Morrison; Thomas Karl

2005-12-01T23:59:59.000Z

380

A New Parsimonious Methodology of Mapping the Spatial Variability of Annual Maximum Rainfall in Mountainous Environments  

Science Conference Proceedings (OSTI)

The estimation of rare frequency rainfall is an essential prerequisite for the design of engineering structures and to determine risk areas. Index-based methods are among the most applied for regional frequency analysis of hydrological variables ...

G. Boni; A. Parodi; F. Siccardi

2008-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Motor Pool Department The Motor Pool Department is responsible for the maintenance of over 550 Georgia Tech state  

E-Print Network (OSTI)

Motor Pool Department The Motor Pool Department is responsible for the maintenance of over 550 and equipment costing $3,000 or more for the Institute's vehicle fleet program. The mission of the Motor Pool form when bringing their vehicles, LSVs, golf carts or equipment to the Motor Pool for service (see

Li, Mo

382

,"U.S. Motor Gasoline Prices"  

U.S. Energy Information Administration (EIA) Indexed Site

Prices" Prices" ,"Click worksheet name or tab at bottom for data" ,"Worksheet Name","Description","# Of Series","Frequency","Latest Data for" ,"Data 1","U.S. Motor Gasoline Prices",6,"Monthly","9/2013","1/15/1983" ,"Release Date:","12/2/2013" ,"Next Release Date:","1/2/2014" ,"Excel File Name:","pet_pri_allmg_c_nus_epm0_dpgal_m.xls" ,"Available from Web Page:","http://www.eia.gov/dnav/pet/pet_pri_allmg_c_nus_epm0_dpgal_m.htm" ,"Source:","Energy Information Administration" ,"For Help, Contact:","infoctr@eia.gov" ,,"(202) 586-8800",,,"12/2/2013 2:33:46 AM"

383

Orographic Influences on the Distribution and Generation of Atmospheric Variability in a GCM  

Science Conference Proceedings (OSTI)

The effect of large-scale mountains on atmospheric variability is studied in a series of GCM experiments in which a single mountain is varied in height from 0 to 4 km. High-frequency (? 30 days) variability are ...

Jin-Yi Yu; Dennis L. Hartmann

1995-07-01T23:59:59.000Z

384

Reconstructing the NH Mean Temperature: Can Underestimation of Trends and Variability Be Avoided?  

Science Conference Proceedings (OSTI)

There are indications that hemispheric-mean climate reconstructions seriously underestimate the amplitude of low-frequency variability and trends. Some of the theory of linear regression and error-in-variables models is reviewed to identify the ...

Bo Christiansen

2011-02-01T23:59:59.000Z

385

Graphene Frequency Multipliers  

E-Print Network (OSTI)

In this letter, the ambipolar transport properties of graphene flakes have been used to fabricate full-wave signal rectifiers and frequency-doubling devices. By correctly biasing an ambipolar graphene field-effect transistor ...

Wang, Han

386

Intraseasonal variability of the west African monsoon and African easterly waves during boreal summer.  

E-Print Network (OSTI)

??Substantial subseasonal variability in African easterly wave (AEW) activity and cyclogenesis frequency occurs in the main hurricane development region of the Atlantic during boreal summer. (more)

Alaka, Ghassan J.

2010-01-01T23:59:59.000Z

387

High frequency breakdown voltage  

SciTech Connect

This report contains information about the effect of frequency on the breakdown voltage of an air gap at standard pressure and temperature, 76 mm Hg and O{degrees}C, respectively. The frequencies of interest are 47 MHz and 60 MHz. Additionally, the breakdown in vacuum is briefly considered. The breakdown mechanism is explained on the basis of collision and ionization. The presence of the positive ions produced by ionization enhances the field in the gap, and thus determines the breakdown. When a low-frequency voltage is applied across the gap, the breakdown mechanism is the same as that caused by the DC or static voltage. However, when the frequency exceeds the first critical value f{sub c}, the positive ions are trapped in the gap, increasing the field considerably. This makes the breakdown occur earlier; in other words, the breakdown voltage is lowered. As the frequency increases two decades or more, the second critical frequency, f{sub ce}, is reached. This time the electrons start being trapped in the gap. Those electrons that travel multiple times across the gap before reaching the positive electrode result in an enormous number of electrons and positive ions being present in the gap. The result is a further decrease of the breakdown voltage. However, increasing the frequency does not decrease the breakdown voltage correspondingly. In fact, the associated breakdown field intensity is almost constant (about 29 kV/cm).The reason is that the recombination rate increases and counterbalances the production rate, thus reducing the effect of the positive ions` concentration in the gap. The theory of collision and ionization does not apply to the breakdown in vacuum. It seems that the breakdown in vacuum is primarily determined by the irregularities on the surfaces of the electrodes. Therefore, the effect of frequency on the breakdown, if any, is of secondary importance.

Chu, Thanh Duy

1992-03-01T23:59:59.000Z

388

IEMDC-IN-LINE ELECTRIC MOTOR DRIVEN COMPRESSOR  

Science Conference Proceedings (OSTI)

During this reporting period, significant progress has been made towards the development of the IEMDC System design. Considerable effort was put forth by Curtiss-Wright EMD in the resolution of the technical issue of aerodynamically induced radial forces. This has provided a design basis with which to establish the radial magnetic bearing load capacity and the rotordynamic design. Dresser-Rand has made considerable progress on the flowpath design for the compressor section particularly on the volute and inlet aerodynamic design. All efforts show progression towards the successful integration of a centrifugal compressor and variable speed electric motor ventilated by the process gas. These efforts continue to confirm the feasibility of the IEMDC system design.

Michael J. Crowley; Prem N. Bansal; John E. Tessaro

2003-06-01T23:59:59.000Z

389

3M's Motor Challenge Showcase Demonstration Project  

E-Print Network (OSTI)

In January 1994, 3M began the task of optimizing the electric motor systems at 3M Center, a 26 building, 7 million square foot corporate campus. A cross-functional, cross-company team was established which included four 3M employees representing two different departments within 3M, an engineer specializing in demand side management programs from Northern States Power Company, and a sales engineer from General Electric Supply Company. The team was later joined by an engineering specialist from Landis & Staefa, Inc., a building automation controls supplier. The team began the task of identifying the projects that could save energy and provide a reasonable return on 3M's investment on a building by building approach. As surveys were completed, proposals were prepared and presented to management requesting funding. The team continued the process of identifying projects in remaining buildings and took on the responsibility of designing, contracting and implementing projects as funding was approved for those already studied. Follow-up measurements to ascertain that the savings predicted was actually achieved are done before project close-out. This project was submitted and accepted as a Motor Challenge Showcase Demonstration Project. The Motor Challenge is a U.S. Department of Energy initiative to promote the efficient use of energy in electric motor systems. Showcase Demonstration Projects are used to exemplify the benefits that motor system optimization can provide. This Showcase Project is different from most as it emphasizes the process that was developed to carry out a project of this magnitude rather than any single specific technologies or applications. The team has completed the project at 3M Center. Measured savings are $823,000 per year. This paper will discuss the Motor Challenge Showcase Demonstration project that was completed at 3M Center, the motor systems survey methodology the team developed, analysis tools and techniques and the results that have been attained.

Schultz, S. C.

1998-04-01T23:59:59.000Z

390

3M's Motor Challenge Showcase Demonstration Project  

E-Print Network (OSTI)

In January 1994, 3M began the task of optimizing the electric motor systems at 3M Center, a 26 building, 7 million square foot corporate campus. A cross-functional, cross-company team was established which included four 3M employees representing two different departments within 3M, an engineer specializing in demand side management programs from Northern States Power Company, and a sales engineer from General Electric Supply Company. The team was later joined by an engineering specialist from Landis & Gyr, Inc., a building automation controls supplier. The team began the task of identifying the projects that could save energy and provide a reasonable return on 3M's investment on a building by building approach. As surveys were completed, proposals were prepared and presented to management requesting funding. The team continued the process of identifying projects in remaining buildings and took on the responsibility of designing, contracting and implementing projects as funding was approved for those already studied. Follow-up measurements to ascertain that the savings predicted was actually achieved are done before project close-out. This project was submitted and has been accepted as a Motor Challenge Showcase Demonstration Project. The Motor Challenge is a U. S. Department of Energy initiative to promote the efficient use of energy in electric motor systems. Showcase Demonstration Projects are used to exemplify the benefits that motor system optimization can provide. This Showcase Project is different from most as it emphasizes the process that was developed to carry out a project of this magnitude rather than any single specific technologies or applications. The team has nearly completed the studies at 3M Center and is well into the implementation phase with six buildings being complete. Savings identified to date are approximately $810,000 per year. This paper will discuss the Motor Challenge Showcase Demonstration project currently underway at 3M Center, the motor systems survey methodology the team developed, analysis tools and techniques and the results that have been attained.

Schultz, S. C.

1996-04-01T23:59:59.000Z

391

Alternative Fuels Data Center: Natural Gas Motor Vehicle Fuel Promotion  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Natural Gas Motor Natural Gas Motor Vehicle Fuel Promotion to someone by E-mail Share Alternative Fuels Data Center: Natural Gas Motor Vehicle Fuel Promotion on Facebook Tweet about Alternative Fuels Data Center: Natural Gas Motor Vehicle Fuel Promotion on Twitter Bookmark Alternative Fuels Data Center: Natural Gas Motor Vehicle Fuel Promotion on Google Bookmark Alternative Fuels Data Center: Natural Gas Motor Vehicle Fuel Promotion on Delicious Rank Alternative Fuels Data Center: Natural Gas Motor Vehicle Fuel Promotion on Digg Find More places to share Alternative Fuels Data Center: Natural Gas Motor Vehicle Fuel Promotion on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Natural Gas Motor Vehicle Fuel Promotion An eight member Natural Gas Fuel Board (Board) was created to advise the

392

Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Credit  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Fuel Cell Motor Fuel Cell Motor Vehicle Tax Credit to someone by E-mail Share Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Credit on Facebook Tweet about Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Credit on Twitter Bookmark Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Credit on Google Bookmark Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Credit on Delicious Rank Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Credit on Digg Find More places to share Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Credit on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Fuel Cell Motor Vehicle Tax Credit A tax credit of up to $4,000 is available for the purchase of qualified

393

Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Deduction  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Fuel Cell Motor Fuel Cell Motor Vehicle Tax Deduction to someone by E-mail Share Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Deduction on Facebook Tweet about Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Deduction on Twitter Bookmark Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Deduction on Google Bookmark Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Deduction on Delicious Rank Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Deduction on Digg Find More places to share Alternative Fuels Data Center: Fuel Cell Motor Vehicle Tax Deduction on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Fuel Cell Motor Vehicle Tax Deduction A taxpayer is eligible for a $2,000 tax deduction for the purchase of a

394

Motor function in interpolar microtubules during metaphase  

E-Print Network (OSTI)

We analyze experimental observations of microtubules undergoing small fluctuations about a "balance point" when mixed in solution of two different kinesin motor proteins, KLP61F and Ncd. It has been proposed that the microtubule movement is due to stochastic variations in the densities of the two species of motor proteins. We test this hypothesis here by showing how it maps onto a one-dimensional random walk in a random environment. Our estimate of the amplitude of the fluctuations agrees with experimental observations. We point out that there is an initial transient in the position of the microtubule where it will typically move of order its own length. We compare the physics of this gliding assay to a recent theory of the role of antagonistic motors on restricting interpolar microtubule sliding of a cell's mitotic spindle during prometaphase. It is concluded that randomly positioned antagonistic motors can restrict relative movement of microtubules, however they do so imperfectly. A variation in motor concentrations is also analyzed and shown to lead to greater control of spindle length.

J. M. Deutsch; Ian P. Lewis

2013-07-22T23:59:59.000Z

395

Trends in motor gasolines: 1942-1981  

Science Conference Proceedings (OSTI)

Trends in motor gasolines for the years of 1942 through 1981 have been evaluated based upon data contained in surveys that have been prepared and published by the Bartlesville Energy Technology Center (BETC). These surveys have been published twice annually since 1935 describing the properties of motor gasolines from throughout the country. The surveys have been conducted in cooperation with the American Petroleum Institute (API) since 1948. Various companies from throughout the country obtain samples from retail outlets, analyze the samples by the American Society for Testing and Materials (ASTM) procedures, and report data to the Bartlesville center for compilation, tabulation, calculation, analysis and publication. A typical motor gasoline report covers 2400 samples from service stations throughout the country representing some 48 companies that manufacture and supply gasoline. The reports include trend charts, octane plots, and tables of test results from about a dozen different tests. From these data in 77 semiannual surveys, a summary report has thus been assembled that shows trends in motor gasolines throughout the entire era of winter 1942 to 1943 to the present. Trends of physical properties including octane numbers, antiknock ratings, distillation temperatures, Reid vapor pressure, sulfur and lead content are tabulated, plotted and discussed in the current report. Also included are trend effects of technological advances and the interactions of engine design, societal and political events and prices upon motor gasoline evolution during the 40 year period.

Shelton, E M; Whisman, M L; Woodward, P W

1982-06-01T23:59:59.000Z

396

Sequence learning in pianists and nonpianists: An fMRI study of motor expertise  

E-Print Network (OSTI)

related changes in human motor function. Neurology, Meister,brief practice of a simple motor task. Cognitive Brain1996). Asymmetry in the human motor cortex and handedness.

Landau, Susan M; D'esposito, Mark

2006-01-01T23:59:59.000Z

397

A Multi-Country Analysis of Lifecycle Emissions From Transportation Fuels and Motor Vehicles  

E-Print Network (OSTI)

from Transportation Fuels, Motor Vehicles, Transportationfrom alternative fuels for motor vehicles and electricity-Environmental Externalities of Motor-Vehicle Use in the U.

Delucchi, Mark

2005-01-01T23:59:59.000Z

398

Sub-threshold spinal cord stimulation facilitates spontaneous motor activity in spinal rats  

E-Print Network (OSTI)

facilitates spontaneous motor activity in spinal rats.facilitates spontaneous motor activity in spinal rats Paragtreadmill (electrical enabling motor control, eEmc) after a

2013-01-01T23:59:59.000Z

399

Emergency Department Visits by Older Adults for Motor Vehicle Collisions: A Five-Year National Study  

E-Print Network (OSTI)

KM, Esserman DA, et al. Motor vehicle collision-relatedVisits by Older Adults for Motor Vehicle Collisions * Denvervisits by older adults for motor vehicle collisions (MVC) in

Vogel, Jody A; Ginde, Adit A.; Lowenstein, Steven R.; Betz, Marian E.

2013-01-01T23:59:59.000Z

400

Vital Signs: Emergency Department and Older Adult Motor Vehicle Collisions: Prevention is Paramount  

E-Print Network (OSTI)

Severity of Older Adult Motor Vehicle Collisions in OrangeOlder adults opinion of and motor vehicle-related crashes32. California Department of Motor Vehicles. Senior Driver:

Lotfipour, Shahram; Cisneros, Victor; Chakravarthy, Bharath

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Dissecting the Operating Mechanism of a Biological Motor One Molecule at a Time  

E-Print Network (OSTI)

a viral DNA packaging motor. Nature 461, 669-673 Abrahams,of High Resolution Recordings of Motor Movement, Biophysicalstructure of the dynein motor domain. Science 331, 1159-

Chistol, Gheorghe

2013-01-01T23:59:59.000Z

402

Coupled simulation of an indirect field oriented controlled induction motor drive.  

E-Print Network (OSTI)

??Conventionally, system simulations of induction motor drives use lumped parameters model of the motor. This approach assumes motor parameters to be constant during the entire (more)

Legesse, Michael.

2008-01-01T23:59:59.000Z

403

The role of brain-derived neurotrophic factor in cortical motor learning  

E-Print Network (OSTI)

organization of adult motor cortex is dependent uponorganization of primary motor cortex output to targetreorganization following motor nerve lesions. Exp Brain Res,

Von dem Bussche, Mary

2007-01-01T23:59:59.000Z

404

Impacts of motor vehicle operation on water quality - Clean-up Costs and Policies  

E-Print Network (OSTI)

preventing water pollution from motor vehicles would be muchgroundwater pollution; motor-vehicle transportation;the environmental costs of motor vehicle transportation in

Nixon, Hilary; Saphores, Jean-Daniel M

2007-01-01T23:59:59.000Z

405

The Sex Chromosome Trisomy mouse model of XXY and XYY: metabolism and motor performance  

E-Print Network (OSTI)

synuclein shows improvement in motor function and reductionof XXY and XYY: metabolism and motor performance. Biology ofand XYY: metabolism and motor performance Xuqi Chen 1,3 ,

2013-01-01T23:59:59.000Z

406

A MULTI-COUNTRY ANALYSIS OF LIFECYCLE EMISSIONS FROM TRANSPORTATION FUELS AND MOTOR VEHICLES  

E-Print Network (OSTI)

from Transportation Fuels, Motor Vehicles, Transportationfrom alternative fuels for motor vehicles and electricity-Environmental Externalities of Motor-Vehicle Use in the U.

Delucchi, Mark

2005-01-01T23:59:59.000Z

407

How large are tax subsidies to motor-vehicle users in the US?  

E-Print Network (OSTI)

of this deriving from motor fuels (the oil industry) ratherincome (%) Income year 1991 a Oil industries Motor vehicleindustries Oil and motor vehicle industries combined Amount

Delucchi, Mark; Murphy, James

2008-01-01T23:59:59.000Z

408

The Impact of Motor Vehicle Operation on Water Quality: A Premilinary Assessment  

E-Print Network (OSTI)

Institute), 1997. Used Motor Oil Collection and Recycling. Amillion gallons of used motor oil are improperly dischargedLike crude oil slicks, used motor oil can destroy aquatic

Nixon, Hillary; Saphores, Jean-Daniel

2003-01-01T23:59:59.000Z

409

Descriptions of Motor Vehicle Collisions by Participants in Emergency DepartmentBased Studies: Are They Accurate?  

E-Print Network (OSTI)

reports in determining motor vehicle crash characteristics.R ESEARCH Descriptions of Motor Vehicle Collisions byThe immediate aftermath of motor vehicle collisions. In:

2012-01-01T23:59:59.000Z

410

The China Motor Systems Energy Conservation Program:A Major National...  

NLE Websites -- All DOE Office Websites (Extended Search)

electricity use. There are large opportunities toimprove the efficiency of motor systems. Electric motors in China are approximately 2-4%less efficient on average than motors in...

411

A MULTI-COUNTRY ANALYSIS OF LIFECYCLE EMISSIONS FROM TRANSPORTATION FUELS AND MOTOR VEHICLES  

E-Print Network (OSTI)

Organization of Motor Vehicle Manufacturers, Paris, France,Organization of Motor Vehicle Manufacturers (2003) providesOrganization of Motor Vehicle Manufacturers. Because of

Delucchi, Mark

2005-01-01T23:59:59.000Z

412

A Multi-Country Analysis of Lifecycle Emissions From Transportation Fuels and Motor Vehicles  

E-Print Network (OSTI)

Organization of Motor Vehicle Manufacturers, Paris, France,Organization of Motor Vehicle Manufacturers (2003) providesOrganization of Motor Vehicle Manufacturers. Because of

Delucchi, Mark

2005-01-01T23:59:59.000Z

413

Force-velocity relations for multiple-molecular-motor transport  

E-Print Network (OSTI)

A transition rate model of cargo transport by $N$ molecular motors is proposed. Under the assumption of steady state, the force-velocity curve of multi-motor system can be derived from the force-velocity curve of single motor. Our work shows, in the case of low load, the velocity of multi-motor system can decrease or increase with increasing motor number, which is dependent on the single motor force-velocity curve. And most commonly, the velocity decreases. This gives a possible explanation to some recent

Ziqing Wang; Ming Li

2009-06-26T23:59:59.000Z

414

Non-Motorized Travel Study.pub  

NLE Websites -- All DOE Office Websites (Extended Search)

Motorized Travel Study: Motorized Travel Study: Identifying Factors that Influence Communities to Walk and Bike and to Examine Why, or Why Not, Travelers Walk and Bike in Their Communities Oak Ridge National Laboratory managed by UT-Battelle, LLC for the U.S. Department of Energy under Contract number DE-AC05-00OR22725 Research Areas Freight Flows Passenger Flows Supply Chain Efficiency Transportation: Energy Environment Safety Security Vehicle Technologies Research Brief T he idea of livable communities suggests that people should have the option to utilize non-motorized travel (NMT), specifically walking and bicycling, to conduct their daily tasks. Forecasting personal travel by walk and bike is necessary as part of regional transportation planning, and requires fine

415

Performance improvement of permanent magnet ac motors  

E-Print Network (OSTI)

Multi-phase motors have several advantages over the traditional three-phase motors. In this study, the additional degrees of freedom available in five-phase permanent magnet motors have been used for three purposes: 1) enhancing the torque producing capability of the motor, 2) improving the reliability of the system, and 3) better adjusting of the torque and flux linkages of the five-phase direct torque controlled system. 1) Due to the fact that space and time harmonics of the same orders will contribute positively to output torque, a five-phase permanent magnet motor with quasi-rectangular back-EMF waveform is supplied with combined fundamental and third harmonic of currents. For modeling and analysis of the motor a 0 3 3 1 1 q d q d frame of reference is defined where 1 1q d rotates at the synchronous speed and 3 3q d rotates at the three times synchronous speed. Based on the mathematical model in the 0 3 3 1 1 q d q d frame of reference, it is shown that this system while having a higher torque density with respect to a conventional permanent magnet synchronous machine, is also compatible with vector control algorithm. 2) A resilient current control of the five-phase permanent motor with both sinusoidal and trapezoidal back-EMF waveforms under asymmetrical fault condition is proposed. In this scheme, the stator MMF is kept unchanged during healthy and faulty condition. Therefore, the five-phase permanent magnet motor operates continuously and steadily without additional hardware and just by modifying the control algorithm in case of loss of up to two phases. The feature is of major importance in some specific applications where high reliability is required. 3) High torque and flux ripple are the major drawbacks of a three-phase direct torque controlled system. The number of space voltage vectors directly influences the performance of DTC system. A five-phase drive, while benefiting from other advantages of high order phase drives, has inherently 32 space voltage vectors which permits better flexibility in selecting the switching states and finer adjustment of flux and torque. A sensorless direct torque control of five-phase permanent magnet motor is implemented. Speed information is obtained based on the position of stator flux linkages and load angle. Experiments have been conducted on a 5kW five-phase surface mount permanent magnet motor and a 3kW five-phase interior permanent magnet motor by using TMS320C32 DSP. The results obtained are consistent with theoretical studies and simulation analysis, which further demonstrate the feasibility and practical significance of the five-phase permanent magnet motor drives.

Parsa, Leila

2005-05-01T23:59:59.000Z

416

New motors solve UBD and HPHT problems  

Science Conference Proceedings (OSTI)

There are two particular areas where industry contractors have been pushing current downhole motor technology to the limits of its capabilities--high temperature (HPHT) and underbalanced (UBD) operations. Economic incentives for slimhole, short-radius re-entry and multilateral wells have been well established, but until recently, the options for this kind of work have been limited. The increased use of coiled tubing has introduced additional challenges for motor manufacturers, with greater emphasis on shortness for ease of rig-up and steerability. These challenges are addressed by a unique new motor that promises benefits for coiled tubing drilling, re-entry work and multilateral drilling, as well as for geothermal wells.

Stewart, D.; Susman, H. [Rotech Holdings Ltd., Aberdeen (United Kingdom)

1997-08-01T23:59:59.000Z

417

Soft-commutated direct current motor  

DOE Patents (OSTI)

A method and circuit is disclosed for soft-commutation of a direct current (DC) motor. An attenuation circuit is connected through auxiliary brushes A, A', B and B' to the commutator (16) to drain circuit from successive armature coils (15) before the main brushes (27, 28) disconnects from each of the coils (15). This prevents the spark generation that normally occurs in conventional DC motors. The attenuation circuit may also be connected before energization of the coil (15) for a soft turning on operation.

Hsu, John S. (Oak Ridge, TN)

1999-01-01T23:59:59.000Z

418

Motor Gasoline Market Model documentation report  

SciTech Connect

The purpose of this report is to define the objectives of the Motor Gasoline Market Model (MGMM), describe its basic approach and to provide detail on model functions. This report is intended as a reference document for model analysts, users, and the general public. The MGMM performs a short-term (6- to 9-month) forecast of demand and price for motor gasoline in the US market; it also calculates end of month stock levels. The model is used to analyze certain market behavior assumptions or shocks and to determine the effect on market price, demand and stock level.

1993-09-01T23:59:59.000Z

419

Simulating permanent magnet brushless motors in DYMOLA  

E-Print Network (OSTI)

Multi-domain dynamic simulation is becoming an issue in the design of high performance mechatronic systems, where advances are foreseen only if the mutual interaction of different parts of the system is well understood. The modelling environment provided by DYMOLA with Modelica language proved to be ideal for studying the mutual effects of mechanics, elec- tronics and control in a brushless motor, whose model has been conceived as one of the building blocks of a wider project, aimed at simulating a complete machining centre. Details on the model of the brushless motor as well as on its simulation are given in the present pa- per.

G. Ferretti; G. Magnani; P. Rocco; L. Bonometti; M. Maraglino

2002-01-01T23:59:59.000Z

420

Advanced motor driven clamped borehole seismic receiver  

DOE Patents (OSTI)

A borehole seismic tool is described including a borehole clamp which only moves perpendicular to the borehole. The clamp is driven by an electric motor, via a right angle drive. When used as a seismic receiver, the tool has a three part housing, two of which are hermetically sealed. Accelerometers or geophones are mounted in one hermetically sealed part, the electric motor in the other hermetically sealed part, and the clamp and right angle drive in the third part. Preferably the tool includes cable connectors at both ends. Optionally a shear plate can be added to the clamp to extend the range of the tool.

Engler, B.P.; Sleefe, G.E.; Striker, R.P.

1993-02-23T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Soft-commutated direct current motor  

DOE Patents (OSTI)

A method and circuit is disclosed for soft-commutation of a direct current (DC) motor. An attenuation circuit is connected through auxiliary brushes A, A[prime], B and B[prime] to the commutator (16) to drain circuit from successive armature coils (15) before the main brushes (27, 28) disconnects from each of the coils (15). This prevents the spark generation that normally occurs in conventional DC motors. The attenuation circuit may also be connected before energization of the coil (15) for a soft turning on operation. 13 figs.

Hsu, J.S.

1999-07-27T23:59:59.000Z

422

Why inverse document frequency?  

Science Conference Proceedings (OSTI)

Inverse Document Frequency (IDF) is a popular measure of a word's importance. The IDF invariably appears in a host of heuristic measures used in information retrieval. However, so far the IDF has itself been a heuristic. In this paper, we show IDF to ...

Kishore Papineni

2001-06-01T23:59:59.000Z

423

Modeling Reluctance-Assisted PM Motors  

SciTech Connect

This report contains a derivation of the fundamental equations used to calculate the base speed, torque delivery, and power output of a reluctance-assisted PM motor which has a saliency ratio greater than 1 as a function of its terminal voltage, current, voltage-phase angle, and current-phase angle. The equations are applied to model Motor X using symbolically-oriented methods with the computer tool Mathematica to determine: (1) the values of current-phase angle and voltage-phase angle that are uniquely determined once a base speed has been selected; (2) the attainable current in the voltage-limited region above base speed as a function of terminal voltage, speed, and current-phase angle; (3) the attainable current in the voltage-limited region above base speed as a function of terminal voltage, speed, and voltage-phase angle; (4) the maximum-power output in the voltage-limited region above base speed as a function of speed; (5) the optimal voltage-phase angle in the voltage-limited region above base speed required to obtain maximum-power output; (6) the maximum-power speed curve which was linear from rest to base speed in the current limited region below base speed; (7) the current angle as a function of saliency ratio in the current-limited region below base speed; and (8) the torque as a function of saliency ratio which is almost linear in the current-limited region below base speed. The equations were applied to model Motor X using numerically-oriented methods with the computer tool LabVIEW. The equations were solved iteratively to find optimal current and voltage angles that yield maximum power and maximum efficiency from rest through the current-limited region to base speed and then through the voltage-limited region to high-rotational speeds. Currents, voltages, and reluctance factors were all calculated and external loops were employed to perform additional optimization with respect to PM pitch angle (magnet fraction) and with respect to magnet strength. The conclusion was that the optimal-magnet fraction for Motor X is 0.72 which corresponds to a PM pitch angle of 130{sup o}, a value close to the maximum-saliency ratio in a plot of saliency ratio versus PM pitch angle. Further, the strength of Motor X magnets may be lowered to 80% of full strength without significantly impacting motor performance for PM pitch angles between the peak saliency (130{sup o}) and peak-characteristic current (160{sup o}). It is recommended that future research involve maximizing a driving-cycle-weighted efficiency based on the Federal Urban Driving Cycle and the Federal Highway Driving Cycle as criteria for selecting the final optimal-PM fraction and magnet strength for this inset PM motor. Results of this study indicate that the reduction in PM torque due to reduced-magnet fraction will be more than compensated by the reluctance torque resulting from the higher saliency ratio. It seems likely that the best overall performance will require saliency; consequently, we think the best motor will be a reluctance-assisted PM motor. This should be explored for use with other types of PM motors, such as fractional-slot motors with concentrated windings.

Otaduy, P.J.

2006-01-13T23:59:59.000Z

424

Influence of a high vacuum on the precise positioning using an ultrasonic linear motor  

Science Conference Proceedings (OSTI)

This paper presents an investigation of the ultrasonic linear motor stage for use in a high vacuum environment. The slider table is driven by the hybrid bolt-clamped Langevin-type ultrasonic linear motor, which is excited with its different modes of natural frequencies in both lateral and longitudinal directions. In general, the friction behavior in a vacuum environment becomes different from that in an environment of atmospheric pressure and this difference significantly affects the performance of the ultrasonic linear motor. In this paper, to consistently provide stable and high power of output in a high vacuum, frequency matching was conducted. Moreover, to achieve the fine control performance in the vacuum environment, a modified nominal characteristic trajectory following control method was adopted. Finally, the stage was operated under high vacuum condition, and the operating performances were investigated compared with that of a conventional PI compensator. As a result, robustness of positioning was accomplished in a high vacuum condition with nanometer-level accuracy.

Kim, Wan-Soo; Lee, Dong-Jin; Lee, Sun-Kyu [School of Mechatronics, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712 (Korea, Republic of)

2011-01-15T23:59:59.000Z

425

VARIABLE TIME DELAY MEANS  

DOE Patents (OSTI)

An electrically variable time delay line is described which may be readily controlled simuitaneously with variable impedance matching means coupied thereto such that reflections are prevented. Broadly, the delay line includes a signal winding about a magnetic core whose permeability is electrically variable. Inasmuch as the inductance of the line varies directly with the permeability, the time delay and characteristic impedance of the line both vary as the square root of the permeability. Consequently, impedance matching means may be varied similariy and simultaneously w:th the electrically variable permeability to match the line impedance over the entire range of time delay whereby reflections are prevented.

Clemensen, R.E.

1959-11-01T23:59:59.000Z

426

Inland Power and Light Company - Agricultural Energy Efficiency...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

equipment (nozzles, gaskets, regulators, sprays, drains, hubs, etc), irrigation motor replacements, and variable frequency drives for small milking machines. Specific...

427

Minimum Efficiency Standards for Electric Motors | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Minimum Efficiency Standards for Electric Motors Minimum Efficiency Standards for Electric Motors Minimum Efficiency Standards for Electric Motors October 7, 2013 - 11:28am Addthis Section 313 of the Energy Independence and Security Act (EISA) of 2007 raised Federal minimum efficiency standards for general-purpose, single-speed, polyphase induction motors of 1 to 500 horsepower (hp). This new standard took effect in December 2010. The new minimum efficiency levels match FEMP's performance requirement for these motors. As a result of this increase in mandatory minimum standards and combined with the lack of significant availability of motors exceeding these standards, FEMP is suspending the purchasing specification for electric motors. Federal buyers may select for purchase any motor that meets design requirements.

428

Secrets of the Motor That Drives Archaea Revealed  

NLE Websites -- All DOE Office Websites (Extended Search)

Secrets of the Motor That Drives Archaea Revealed Secrets of the Motor That Drives Archaea Revealed Print Thursday, 14 February 2013 00:00 An international team led by John Tainer...

429

Extended core for motor/generator - Energy Innovation Portal  

An extended stator core in a motor/generator can be utilized to mitigate losses in end regions of the core and a frame of the motor/generator. To mitigate the losses ...

430

Vehicle Technologies Office: Fact #443: November 13, 2006 Motor...  

NLE Websites -- All DOE Office Websites (Extended Search)

3: November 13, 2006 Motor Vehicle Trade between the U.S. and China to someone by E-mail Share Vehicle Technologies Office: Fact 443: November 13, 2006 Motor Vehicle Trade between...

431

Transient Peak Currents in Permanent Magnet Synchronous Motors  

E-Print Network (OSTI)

Transient Peak Currents in Permanent Magnet Synchronous Motors for Symmetrical Short Circuits Terms-- Permanent magnet synchronous motor, short circuit, protection measure, transient behavior I 33095 Paderborn, Germany Abstract--To enable constant-power areas with permanent magnet synchronous

Noé, Reinhold

432

Halbach array DC motor/generator - Energy Innovation Portal  

A new configuration of DC motor/generator is based on a Halbach array of permanent magnets. This motor does not use ferrous materials so that the only losses are ...

433

Modeling and characterization of a voice coil motor  

E-Print Network (OSTI)

This thesis describes the development of a voice-coil motor that will allow viscous fluids to be delivered via a portable needle-free injection device. The chosen motor design features opposing magnets whose flux is channeled ...

Brown, Ashley (Ashley A.)

2012-01-01T23:59:59.000Z

434

9.373 Somatosensory and Motor Systems, Spring 2002  

E-Print Network (OSTI)

General principles of motor control in biological systems. Structure and function of sensory receptors. Muscle structure and reflex arcs. Spinal cord. Locomotion. Oculomotor control. Cerebellar structure and function. Motor ...

Bizzi, Emilio

435

Li ion Motors Corp formerly EV Innovations Inc | Open Energy...  

Open Energy Info (EERE)

Page Edit with form History Facebook icon Twitter icon Li ion Motors Corp formerly EV Innovations Inc Jump to: navigation, search Name Li-ion Motors Corp (formerly EV...

436

Rapid Oscillations in Cataclysmic Variables  

E-Print Network (OSTI)

I give an overview of the rich phenomenology of dwarf nova oscillations (DNOs) and Quasi-periodic Oscillations (QPOs) observed in cataclysmic variable stars (CVs). The favoured interpretation of these rapid brightness modulations (3 - >1000 s time scales) is that they are magnetic in nature - magnetically channelled accretion from the inner accretion disc for DNOs and possible magnetically excited travelling waves in the disc for QPOs. There is increasing evidence for the magnetic aspects, which extend to lower field the well known properties of strong field (polars) and intermediate strength field (intermediate polars) CVs. The result is that almost all CVs show the presence of magnetic fields on their white dwarf primaries - though for many the intrinsic field may be locally enhanced by the accretion process itself. There are many parallel behaviours with the QPOs seen in X-Ray binaries, with high and low frequency X-Ray QPOs resembling respectively the DNOs and QPOs in CVs.

Brian Warner

2003-12-06T23:59:59.000Z

437

Price of Motor Gasoline Through Retail Outlets  

Gasoline and Diesel Fuel Update (EIA)

Prices, Sales Volumes & Stocks by State Prices, Sales Volumes & Stocks by State (Dollars per Gallon Excluding Taxes) Data Series: Retail Price - Motor Gasoline Retail Price - Regular Gasoline Retail Price - Midgrade Gasoline Retail Price - Premium Gasoline Retail Price - Aviation Gasoline Retail Price - Kerosene-Type Jet Fuel Retail Price - Propane Retail Price - Kerosene Retail Price - No. 1 Distillate Retail Price - No. 2 Distillate Retail Price - No. 2 Fuel Oil Retail Price - No. 2 Diesel Fuel Retail Price - No. 4 Fuel Oil Prime Supplier Sales - Motor Gasoline Prime Supplier Sales - Regular Gasoline Prime Supplier Sales - Midgrade Gasoline Prime Supplier Sales - Premium Gasoline Prime Supplier Sales - Aviation Gasoline Prime Supplier Sales - Kerosene-Type Jet Fuel Prime Supplier Sales - Propane (Consumer Grade) Prime Supplier Sales - Kerosene Prime Supplier Sales - No. 1 Distillate Prime Supplier Sales - No. 2 Distillate Prime Supplier Sales - No. 2 Fuel Oil Prime Supplier Sales - No. 2 Diesel Fuel Prime Supplier Sales - No. 4 Fuel Oil Prime Supplier Sales - Residual Fuel Oil Stocks - Finished Motor Gasoline Stocks - Reformulated Gasoline Stocks - Conventional Gasoline Stocks - Motor Gasoline Blending Components Stocks - Kerosene Stocks - Distillate Fuel Oil Stocks - Distillate F.O., 15 ppm and under Sulfur Stocks - Distillate F.O., Greater than 15 to 500 ppm Sulfur Stocks - Distillate F.O., Greater 500 ppm Sulfur Stocks - Residual Fuel Oil Stocks - Propane/Propylene Period: Monthly Annual

438

Premature ignition of a rocket motor.  

SciTech Connect

During preparation for a rocket sled track (RST) event, there was an unexpected ignition of the zuni rocket motor (10/9/08). Three Sandia staff and a contractor were involved in the accident; the contractor was seriously injured and made full recovery. The data recorder battery energized the low energy initiator in the rocket.

Moore, Darlene Ruth

2010-10-01T23:59:59.000Z

439

R FPGA Motor Control Reference Design  

E-Print Network (OSTI)

With the growing complexity of motor and motion control applications, it becomes apparent that a Field Programmable Gate Array (FPGA) offers significant advantage over the off the shelf Application Specific Standard Product (ASSP) solutions in the areas of performance, flexibility and inventory control. With an FPGA, calculations that would normally consume large amounts of CPU time when implemented in software may be hardware accelerated. Using hardware acceleration allows for more functionality within the system software. Custom motor drive interfaces such as PWM can be developed easily, quickly and at low cost. Additionally, because of full configurability, the same FPGA can be used in various product ranges, reducing the need to maintain inventory for multiple devices. This application note describes the Spartan-3 device based FPGA Motor Control Reference Design. This design utilizes the MicroBlaze 32-bit CPU soft core, floating point unit, and associated memory subsystems, SPI communications interface, and IP specifically designed to control brushless DC (BLDC) and three phase AC induction motors. Design files can be found at www.xilinx.com/bvdocs/appnotes/xapp808.zip.

Craig Hackney

2005-01-01T23:59:59.000Z

440

Voltage unbalance effects on induction motor performance  

Science Conference Proceedings (OSTI)

The reliability of electric drives and driven motors depends on the quality of the power supply voltage especially in the critical industrial process. In this work, a theoretical study of the effects of voltage unbalances, sags and swells on induction ... Keywords: efficiency, power losses and derating factor, sags, symmetrical components, voltage unbalance

L. Refoufi; H. Bentarzi; F. Z. Dekhandji

2006-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Physical context management for a motor vehicle  

DOE Patents (OSTI)

Computer software for and a method of enhancing safety for an operator of a motor vehicle comprising employing a plurality of sensors of vehicle and operator conditions, matching collective output from the sensors against a plurality of known dangerous conditions, and preventing certain activity of the operator if a known dangerous condition is detected.

Dixon, Kevin R. (Albuquerque, NM); Forsythe, James C. (Sandia Park, NM); Lippitt, Carl E. (Albuquerque, NM); Lippitt, legal representative, Lois Diane (Albuquerque, NM)

2009-10-27T23:59:59.000Z

442

Lithographically Patterned Channels Spatially Segregate Kinesin Motor  

E-Print Network (OSTI)

to orient microtubules traveling over kinesin-coated surfaces properly. Toward this goal, we have used be developed to orient microtubules and to direct the motion of microtubules along motor-coated surfaces long. Kinesins bind to microtubules and use the energy of ATP hydrolysis to walk unidirectionally along

Hancock, William O.

443

Magnetic tweezers to studyMagnetic tweezers to studyMagnetic tweezers to studyMagnetic tweezers to study DNA motorsDNA motorsDNA motorsDNA motors  

E-Print Network (OSTI)

Magnetic tweezers to studyMagnetic tweezers to studyMagnetic tweezers to studyMagnetic tweezers to study DNA motorsDNA motorsDNA motorsDNA motors MariaMariaMariaMaria MañosasMañosasMañosasMañosas RitortCroquetteCroquetteCroquette----BensimonBensimonBensimonBensimon lablablablab ENS FranceENS FranceENS FranceENS France #12;· Introduction to MT (magnetic tweezers

Ritort, Felix

444

Extended cage adjustable speed electric motors and drive packages  

DOE Patents (OSTI)

The rotor cage of a motor is extended, a second stator is coupled to this extended rotor cage, and the windings have the same number of poles. The motor torque and speed can be controlled by either injecting energy into or extracting energy out from the rotor cage. The motor produces less harmonics than existing doubly-fed motors. Consequently, a new type of low cost, high efficiency drive is produced.

Hsu, John S. (Oak Ridge, TN)

1999-01-01T23:59:59.000Z

445

Motor Gasoline Market Spring 2007 and Implications for Spring...  

Annual Energy Outlook 2012 (EIA)

...2 2. Weekly Total Motor Gasoline Inventories and Gasoline-Crude Oil Price Spread ...4 3. Gasoline Product Supplied...

446

Program to develop improved downhole drilling motors. Semiannual report  

DOE Green Energy (OSTI)

The following are described: the history of turbodrill development, positive displacement motor development, the theory of turbodrills, the theory of positive displacement motors, basic motor components, forces on thrust bearings, thrust bearing design, radial bearing design, rotary seal design, sealed lubrication system, lubricants, and project status. Included in appendices are materials on high-temperature lubricants and a progress report on the design of downhole motor seal, bearing, and lubrication test systems. (MHR)

Maurer, W.C.

1976-11-01T23:59:59.000Z

447

Extended cage adjustable speed electric motors and drive packages  

DOE Patents (OSTI)

The rotor cage of a motor is extended, a second stator is coupled to this extended rotor cage, and the windings have the same number of poles. The motor torque and speed can be controlled by either injecting energy into or extracting energy out from the rotor cage. The motor produces less harmonics than existing doubly-fed motors. Consequently, a new type of low cost, high efficiency drive is produced. 12 figs.

Hsu, J.S.

1999-03-23T23:59:59.000Z

448

Electrical Motor Drive Apparatus and Method - Energy Innovation Portal  

Vehicles and Fuels Industrial Technologies Electrical ... Auto manufacturers ; Industrial motor drive manufacturers; Patents and Patent Applications. ID Number.

449

Parameter estimation of permanent magnet stepper motors without position or velocity sensors  

E-Print Network (OSTI)

Parameter estimation of permanent magnet stepper motors without position or velocity sensors Romain identification method for permanent magnet stepper motors. Current sensors are assumed available, but position magnet stepper motors, syn- chronous motors, sensorless systems, parameter identification, elimination

Paris-Sud XI, Université de

450

EERE-2010-BT-STD-0027 Ex Parte Letter NEMA Motor Training re...  

NLE Websites -- All DOE Office Websites (Extended Search)

0-BT-STD-0027 Ex Parte Letter NEMA Motor Training re DOE Motors Rule 15 July 2013. EERE-2010-BT-STD-0027 Ex Parte Letter NEMA Motor Training re DOE Motors Rule 15 July 2013. This...

451

Do Motor-Vehicle Users in the US Pay Their Way?  

E-Print Network (OSTI)

the sales taxes paid on motor-vehicles, gasoline and motor-as gasoline excise taxes, road tolls, and motor-vehiclegasoline tax (e.g. , Parry and Small, 2005), the incidence of federal and state motor-

Delucchi, Mark

2007-01-01T23:59:59.000Z

452

Efficient Motor System Tools Sponsored by the DOE Motor Challenge Program  

E-Print Network (OSTI)

The Department of Energy's (DOE) Motor Challenge program is an industry/government collaborative that is working to increase the market penetration of efficient motor-driven systems. In support of the program's Showcase Demonstrations, a variety of tools, protocols and databases are being developed. These tools will aid industry in the design, implementation, procurement, and validation of the benefits of energy efficient motor-driven systems. DOE's goal is to provide value-added products to industry to facilitate the decision-making process in maintaining and upgrading motor-driven systems and components. Tools will focus not only on energy factors, but also on productivity, reliability, and capital cost reduction. The tools will be flexible enough to be useful and user-friendly to all potential industrial end-users. It is important that the tools complement rather than compete with currently available software products. To facilitate concurrent development and future improvements, the software tools will consist of modular components.

Blazewicz, S.; McCoy, G. A.; Olszewski, M.; Scheihing, P.

1995-04-01T23:59:59.000Z

453

Gas Mileage of 1993 Vehicles by J.K. Motors  

NLE Websites -- All DOE Office Websites (Extended Search)

3 J.K. Motors Vehicles 3 J.K. Motors Vehicles EPA MPG MODEL City Comb Hwy 1993 J.K. Motors 190E 2.3 MERC BENZ 4 cyl, 2.0 L, Automatic 4-spd, Regular Gasoline Compare 1993 J.K. Motors 190E 2.3 MERC BENZ 16 City 17 Combined 18 Highway 1993 J.K. Motors 230E MERC BENZ 4 cyl, 2.0 L, Automatic 4-spd, Regular Gasoline Compare 1993 J.K. Motors 230E MERC BENZ 16 City 17 Combined 18 Highway 1993 J.K. Motors 300SL 6 cyl, 3.0 L, Automatic 4-spd, Regular Gasoline Compare 1993 J.K. Motors 300SL 14 City 15 Combined 16 Highway 1993 J.K. Motors BMW535I 6 cyl, 3.4 L, Automatic 4-spd, Regular Gasoline Compare 1993 J.K. Motors BMW535I 12 City 14 Combined 18 Highway 1993 J.K. Motors BMW635CSI 6 cyl, 3.4 L, Automatic 4-spd, Regular Gasoline Compare 1993 J.K. Motors BMW635CSI 12 City 14 Combined 18

454

Motor voltage high harmonics influence to efficient energy usage  

Science Conference Proceedings (OSTI)

Analysis of the effect of non-sinusoidal voltages on the three-phase induction motor is presented in the paper. When the induction motors are supplied by a rectangular shape of the voltage inverter with high levels of harmonic voltage (Uh,i ... Keywords: energy efficiency, harmonics, induction motor, non-sinusoidal voltage, power losses

Miloje M. Kostic; Branka B. Kostic

2011-07-01T23:59:59.000Z

455

SUPER HIGH-SPEED MINIATURIZED PERMANENT MAGNET SYNCHRONOUS MOTOR  

E-Print Network (OSTI)

SUPER HIGH-SPEED MINIATURIZED PERMANENT MAGNET SYNCHRONOUS MOTOR by LIPING ZHENG B.S. Shanghai with the design of permanent magnet synchronous motors (PMSM) to operate at super-high speed with high efficiency the motor to have an efficiency reaching above 92%. This achieved efficiency indicated a significant

Wu, Shin-Tson

456

Fuzzy Estimation of DC Motor Winding Currents Innovatia Software  

E-Print Network (OSTI)

in motion, keeping 90 ahead of the rotor °ux. The sta- permanent magnet synchronous motors. It is shown tor. The electrical windings of permanent magnet syn- The motor's winding currents are generally shaped chronous °uxes are experimental data from a motor and ¯ne-tune the aligned, the magnetic ¯elds are in equilibrium

Simon, Dan

457

Ironless Permanent Magnet Motors: Three-Dimensional Analytical Calculation  

E-Print Network (OSTI)

1 Ironless Permanent Magnet Motors: Three-Dimensional Analytical Calculation Romain Ravaud, Guy and the rotor of an ironless permanent magnet motor. The calculations are carried out without using any, torque, magnetic field, PM Synchronous motors ! 1 INTRODUCTION IRONLESS electrical machines are generally

Paris-Sud XI, Université de

458

Modeling of PM Synchronous Motors for Control and Estimation Tasks  

E-Print Network (OSTI)

magnet synchronous motors in stationary frame. The model is based on linear magnetics and includes that illustrate uses of di erent models are also presented. 1 Introduction Permanent magnet synchronous motors magnet- ics for saturation e ects on motor inductances, see for example 3 ; symmetry of the stator phases

Stankoviæ, Aleksandar

459

EE443L Lab 2: Modeling a DC Motor Introduction  

E-Print Network (OSTI)

: In this lab we will develop and validate a basic model of a permanent magnet DC motor (Yaskawa Electric MINI'll discuss a permanent magnet DC motor whose stator consists of a permanent magnet. In this case, we can take in the empty blocks. Figure 2: A block diagram of a permanent magnet DC motor. Prelab Questions: 1) From your

Wedeward, Kevin

460

Optimization of a Single Phase Ultrasonic Linear Motor  

E-Print Network (OSTI)

Optimization of a Single Phase Ultrasonic Linear Motor Markus Flueckiger, Jos´e M. Fernandez.flueckiger@epfl.ch Abstract--Piezoelectric ultrasonic motors are superior to elec- tromagnetic micromotors, because by the means of the finite element method (FEM) is a common approach for dimensioning piezoelectric motors

Psaltis, Demetri

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

VIRTUAL E-MOTOR AS A TOOL FOR THE DEVELOPMENT  

E-Print Network (OSTI)

VIRTUAL E-MOTOR AS A TOOL FOR THE DEVELOPMENT OF POWERTRAIN CONTROLLERS The introduction of electric motors in powertrains provides many possibilities to influence the vehicle driveability using the inverter. The high dynamic response of electric motors can be put to use for the compensation of powertrain

Noé, Reinhold

462

Consequences of Motor Copy Number on the Intracellular Transport of  

E-Print Network (OSTI)

Consequences of Motor Copy Number on the Intracellular Transport of Kinesin-1-Driven Lipid Droplets.P.G.) DOI 10.1016/j.cell.2008.10.021 SUMMARY The microtubule motor kinesin-1 plays central roles and that cargos with more motors move faster andforlonger distances;concreteevidence,however, is sparse. Here we

Texas at Austin. University of

463

Molecular motors interacting with their own tracks Max N. Artyomov  

E-Print Network (OSTI)

Molecular motors interacting with their own tracks Max N. Artyomov Department of Chemistry; published 17 April 2008 Dynamics of molecular motors that move along linear lattices and interact with them exactly solvable discrete-state "burnt- bridge" models. Molecular motors are viewed as diffusing particles

464

Summary of electric vehicle dc motor-controller tests  

DOE Green Energy (OSTI)

Available performance data for production motors are usually of marginal value to the electric vehicle designer. To provide at least a partial remedy to this situation, tests of typical dc propulsion motors and controllers were conducted as part of the DOE Electric Vehicle Program. The objectives of this program were to evaluate the differences in the performance of dc motors when operating with chopper-type controllers and when operating on direct current; and to gain an understanding of the interactions between the motor and the controller which cause these differences. Toward this end, motor-controller tests performed by the NASA Lewis Research Center provided some of the first published data that quantified motor efficiency variations for both ripple-free (straight dc) and chopper modes of operation. Test and analysis work at the University of Pittsburgh explored motor-controller relationships in greater depth. And to provide additional data, 3E Vehicles tested two small motors, both on a dynamometer and in a vehicle, and the Eaton Corporation tested larger motors, using sophisticated instrumentation and digital processing techniques. All the motors tested were direct-current types. Of the separately excited types, seven were series wound and two were shunt wound. One self-excited permanent magnet type was also tested. Four of the series wound motors used brush shifting to obtain good commutation. In almost all cases, controller limitations constrained the test envelope so that the full capability of the motors could not be explored.

McBrien, E F; Tryon, H B

1982-09-01T23:59:59.000Z

465

The Allocation of the Social Costs of Motor-Vehicle Use to Six Classes of Motor Vehicles  

E-Print Network (OSTI)

motor gasoline was $0.957/gallon in 1987, and $1.196 in 1991, including taxes (tax price of gasoline sold by service stations owned by refining companies with the sales- weighted average retail of all motor

Delucchi, Mark A.

1996-01-01T23:59:59.000Z

466

Simple cost model for EV traction motors  

DOE Green Energy (OSTI)

A simple cost model has been developed that allows the calculation of the OEM cost of electric traction motors of three different types, normalized as a function of power in order to accommodate different power and size. The model includes enough information on the various elements integrated in the motors to allow analysis of individual components and to factor-in the effects of changes in commodities prices. A scalable cost model for each of the main components of an electric vehicle (EV) is a useful tool that can have direct application in computer simulation or in parametric studies. For the cost model to have wide usefulness, it needs to be valid for a range of values of some parameter that determines the magnitude or size of the component. For instance, in the case of batteries, size may be determined by energy capacity, usually expressed in kilowatt-hours (kWh), while in the case of traction motors, size is better determined by rated power, usually expressed in kilowatts (kW). The simplest case is when the cost of the component in question is a direct function of its size; then cost is simply the product of its specific cost ($/unit size) and the number of units (size) in the vehicle in question. Batteries usually fall in this category (cost = energy capacity x $/kWh). But cost is not always linear with size or magnitude; motors (and controllers), for instance, become relatively less expensive as power rating increases. Traction motors, one of the main components for EV powertrains are examined in this paper, and a simplified cost model is developed for the three most popular design variations.

Cuenca, R.M.

1995-02-01T23:59:59.000Z

467

High frequency reference electrode  

DOE Patents (OSTI)

A high frequency reference electrode for electrochemical experiments comprises a mercury-calomel or silver-silver chloride reference electrode with a layer of platinum around it and a layer of a chemically and electrically resistant material such as TEFLON around the platinum covering all but a small ring or halo'' at the tip of the reference electrode, adjacent to the active portion of the reference electrode. The voltage output of the platinum layer, which serves as a redox electrode, and that of the reference electrode are coupled by a capacitor or a set of capacitors and the coupled output transmitted to a standard laboratory potentiostat. The platinum may be applied by thermal decomposition to the surface of the reference electrode. The electrode provides superior high-frequency response over conventional electrodes.

Kronberg, J.W.

1991-03-05T23:59:59.000Z

468

High frequency reference electrode  

DOE Patents (OSTI)

A high frequency reference electrode for electrochemical experiments comprises a mercury-calomel or silver-silver chloride reference electrode with a layer of platinum around it and a layer of a chemically and electrically resistant material such as TEFLON around the platinum covering all but a small ring or halo' at the tip of the reference electrode, adjacent to the active portion of the reference electrode. The voltage output of the platinum layer, which serves as a redox electrode, and that of the reference electrode are coupled by a capacitor or a set of capacitors and the coupled output transmitted to a standard laboratory potentiostat. The platinum may be applied by thermal decomposition to the surface of the reference electrode. The electrode provides superior high-frequency response over conventional electrodes. 4 figs.

Kronberg, J.W.

1994-05-31T23:59:59.000Z

469

High frequency reference electrode  

DOE Patents (OSTI)

A high frequency reference electrode for electrochemical experiments comprises a mercury-calomel or silver-silver chloride reference electrode with a layer of platinum around it and a layer of a chemically and electrically resistant material such as TEFLON around the platinum covering all but a small ring or "halo" at the tip of the reference electrode, adjacent to the active portion of the reference electrode. The voltage output of the platinum layer, which serves as a redox electrode, and that of the reference electrode are coupled by a capacitor or a set of capacitors and the coupled output transmitted to a standard laboratory potentiostat. The platinum may be applied by thermal decomposition to the surface of the reference electrode. The electrode provides superior high-frequency response over conventional electrodes.

Kronberg, James W. (Aiken, SC)

1994-01-01T23:59:59.000Z

470

Car Based Transport and Transit Oriented Metropolitan Chinese Urban Motorization Pathways  

E-Print Network (OSTI)

reprocessing of used motor oil are a serious environmentalcan be traced to motor fuels and the oils and salts that

Ximing, Lu

2008-01-01T23:59:59.000Z

471

Motor-Vehicle Infrastructure and Services Provided by the Public Sector: Report #7 in the series: The Annualized Social Cost of Motor-Vehicle Use in the United States, based on 1990-1991 Data  

E-Print Network (OSTI)

motor-vehicle parts, and motor-oil are recycled. Presumably,parts, motor fuels, or motor oil. I assume a range of 4-8%.relationship between motor-vehicle use and oil imports is

Delucchi, Mark; Murphy, James

2005-01-01T23:59:59.000Z

472

MOTOR-VEHICLE INFRASTRUCTURE AND SERVICES PROVIDED BY THE PUBLIC SECTOR Report #7 in the series: The Annualized Social Cost of Motor-Vehicle Use in the United States, based on 1990-1991 Data  

E-Print Network (OSTI)

motor-vehicle parts, and motor-oil are recycled. Presumably,parts, motor fuels, or motor oil. I assume a range of 4-8%.relationship between motor-vehicle use and oil imports is

Delucchi, Mark

2005-01-01T23:59:59.000Z

473

List of Motor VFDs Incentives | Open Energy Information  

Open Energy Info (EERE)

Motor VFDs Incentives Motor VFDs Incentives Jump to: navigation, search The following contains the list of 352 Motor VFDs Incentives. CSV (rows 1 - 352) Incentive Incentive Type Place Applicable Sector Eligible Technologies Active AEP (Central and North) - CitySmart Program (Texas) Utility Rebate Program Texas Commercial Industrial Institutional Local Government Schools Boilers Central Air conditioners Chillers Comprehensive Measures/Whole Building Custom/Others pending approval Energy Mgmt. Systems/Building Controls Furnaces Heat pumps Lighting Lighting Controls/Sensors Motor VFDs Motors Roofs Windows Yes AEP (Central, North and SWEPCO) - Commercial Solutions Program (Texas) Utility Rebate Program Texas Commercial Industrial Institutional Local Government Nonprofit Schools State Government

474

Traffic of cytoskeletal motors with disordered attachment rates  

E-Print Network (OSTI)

Motivated by experimental results on the interplay between molecular motors and tau proteins, we extend lattice-based models of intracellular transport to include a second species of particle which locally influences the motor-filament attachment rate. We consider various exactly solvable limits of a stochastic multi-particle model before focusing on the low-motor-density regime. Here, an approximate treatment based on the random walk behaviour of single motors gives good quantitative agreement with simulation results for the tau-dependence of the motor current. Finally, we discuss the possible physiological implications of our results.

H. Grzeschik; R. J. Harris; L. Santen

2008-06-24T23:59:59.000Z

475

The torque-speed relationship of the bacterial flagellar motor  

E-Print Network (OSTI)

Many swimming bacteria are propelled by flagellar filaments driven by a rotary motor. Each of these tiny motors can generate an impressive torque. The motor torque vs. speed relationship is considered one of the most important measurable characteristics of the motor and therefore is a major criterion for judging models proposed for the working mechanism. Here we give an explicit explanation for this torquespeed curve. The same physics also can explain certain puzzling properties of other motors. energy conversion ? mathematical model ? molecular motor ? proton motive force ? mechanochemistry The bacterial flagellar motor (BFM) consists of a rotary motor embedded in the cell envelope connected to an extracellular helical propeller (see Fig. 1) (14). The motor is powered by the flow of ions down an electrochemical gradient across the cytoplasmic membrane into the cell. The ions are typically H ? (protons) in Escherichia coli and Na ? in alkalophiles and marine Vibrio species. For convenience of discussion, we will focus on the proton motor, although most of the discussion applies to the sodium motor as well. The electrochemical gradient, ?? (proton-motive force or sodium-motive force), consists of a transmembrane voltage and a concentration difference across the membrane, both of which are maintained by various metabolic processes. The proton-motive force is defined as ?? ? pmf ? ?? membrane potential ? 2.303 kBT e ?pH.

Jianhua Xing; Fan Bai; Richard Berry; George Oster; Transmembrane Ion

2006-01-01T23:59:59.000Z

476

Copper in the Rotor for Lighter, Longer Lasting Motors  

E-Print Network (OSTI)

This paper reviews the advantages of substituting die-cast copper for aluminum in the motor rotor. This advance in motor technology has been long sought by the motor industry but short die life due to the high melting point of copper frustrated attempts to manufacture by pressure die casting. The nickel-base alloy hot die technology developed to solve the manufacturing problem is briefly reviewed. Development work done prior to the present program and commercial motors derived from that work have focused on the increased electrical energy efficiency achievable by using copper with its higher electrical conductivity in the rotor. Performance characteristics of example industrial motors are presented. Modification of the conductor bar shape to control in-rush current and starting torque to accommodate copper in the rotor will be discussed. Modeling by motor manufacturers has shown that by using copper in the rotor, a lighter motor than an aluminum rotor motor at the same efficiency can be built. An example of weight savings calculated for a 15 Hp (11 kW) motor is presented. Data presented here show that motors with copper rotors run cooler. Industry experience shows that cooler operation translates to reduced maintenance costs, improved reliability and longer motor life.

C. Stark; J. G. Cowie; D. T. Peters; E. F. Brush

2005-01-01T23:59:59.000Z

477

Vehicle Technologies Office: Fact #601: December 14, 2009 World Motor  

NLE Websites -- All DOE Office Websites (Extended Search)

1: December 14, 1: December 14, 2009 World Motor Vehicle Production to someone by E-mail Share Vehicle Technologies Office: Fact #601: December 14, 2009 World Motor Vehicle Production on Facebook Tweet about Vehicle Technologies Office: Fact #601: December 14, 2009 World Motor Vehicle Production on Twitter Bookmark Vehicle Technologies Office: Fact #601: December 14, 2009 World Motor Vehicle Production on Google Bookmark Vehicle Technologies Office: Fact #601: December 14, 2009 World Motor Vehicle Production on Delicious Rank Vehicle Technologies Office: Fact #601: December 14, 2009 World Motor Vehicle Production on Digg Find More places to share Vehicle Technologies Office: Fact #601: December 14, 2009 World Motor Vehicle Production on AddThis.com... Fact #601: December 14, 2009

478

Demand, Supply, and Price Outlook for Reformulated Motor Gasoline 1995  

Gasoline and Diesel Fuel Update (EIA)

Demand, Supply, and Price Outlook for Reformulated Demand, Supply, and Price Outlook for Reformulated Motor Gasoline 1995 by Tancred Lidderdale* Provisions of the Clean Air Act Amendments of 1990 designed to reduce ground-level ozone will increase the demand for reformulated motor gaso- line in a number of U.S. metropolitan areas. Refor- mulated motor gasoline is expected to constitute about one-third of total motor gasoline demand in 1995, and refiners will have to change plant opera- tions and modify equipment in order to meet the higher demand. The costs incurred are expected to create a wholesale price premium for reformu- lated motor gasoline of up to 4.0 cents per gallon over the price of conventional motor gasoline. This article discusses the effects of the new regulations on the motor gasoline market and the refining

479

Renewal processes and fluctuation analysis of molecular motor stepping  

E-Print Network (OSTI)

Abstract. We present a systematic method of analysis of experiments performed with single motors proteins. The use of such a method should allow a more detailed description of the motors chemical cycle through the precise fitting of the experimental data. We model the dynamics of a processive or rotary molecular motor using a renewal processes, in line with the work initiated by Svoboda, Mitra and Block. We apply a functional technique to compute different types of multiple-time correlation functions of the renewal process, which have applications to bead-assay experiments performed both with processive molecular motors, such as myosin V and kinesin, and rotary motors, such as F1-ATPase. PACS numbers: 02.50.Ey,05.60.-k,05.40.-a To whom correspondence should be addressed (frey@lmu.de) Renewal processes and fluctuation analysis of molecular motor stepping 2 1.

Jaime E. Santos; Thomas Franosch; Andrea Parmeggiani

2005-01-01T23:59:59.000Z

480

MHK Technologies/MotorWave | Open Energy Information  

Open Energy Info (EERE)

MotorWave MotorWave < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage MotorWave.jpg Technology Profile Primary Organization Motor Wave Group Technology Resource Click here Wave Technology Type Click here Point Absorber - Floating Technology Readiness Level Click here TRL 1 3 Discovery Concept Def Early Stage Dev Design Engineering Technology Description The MotorWave device is composed of about 70 float modules with each float measuring about 4 m3 Each MotorWave is designed to pump water ashore for onshore applications or energy production Technology Dimensions Device Testing Date Submitted 45:49.5 << Return to the MHK database homepage Retrieved from "http://en.openei.org/w/index.php?title=MHK_Technologies/MotorWave&oldid=681609

Note: This page contains sample records for the topic "motors variable frequency" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Understanding Biomass Feedstock Variability  

SciTech Connect

If the singular goal of biomass logistics and the design of biomass feedstock supply systems is to reduce the per ton supply cost of biomass, these systems may very well develop with ultimate unintended consequences of highly variable and reduced quality biomass feedstocks. This paper demonstrates that due to inherent species variabilities, production conditions, and differing harvest, collection, and storage practices, this is a very real scenario that biomass producers and suppliers as well as conversion developers should be aware of. Biomass feedstock attributes of ash, carbohydrates, moisture, and particle morphology will be discussed. We will also discuss specifications for these attributes, inherent variability of these attributes in biomass feedstocks, and approaches and solutions for reducing variability for improving feedstock quality.

Kevin L. Kenney; William A. Smith; Garold L. Gresham; Tyler L. Westover

2013-01-01T23:59:59.000Z

482

Estimated Global Hydrographic Variability  

Science Conference Proceedings (OSTI)

An estimate is made of the three-dimensional global oceanic temperature and salinity variability, omitting the seasonal cycle, both as a major descriptive element of the ocean circulation and for use in the error estimates of state estimation. ...

Gal Forget; Carl Wunsch

2007-08-01T23:59:59.000Z

483

Self isolating high frequency saturable reactor  

DOE Patents (OSTI)

The present invention discloses a saturable reactor and a method for decoupling the interwinding capacitance from the frequency limitations of the reactor so that the equivalent electrical circuit of the saturable reactor comprises a variable inductor. The saturable reactor comprises a plurality of physically symmetrical magnetic cores with closed loop magnetic paths and a novel method of wiring a control winding and a RF winding. The present invention additionally discloses a matching network and method for matching the impedances of a RF generator to a load. The matching network comprises a matching transformer and a saturable reactor.

Moore, James A. (Powell, TN)

1998-06-23T23:59:59.000Z

484

Summer 2003 Motor Gasoline Outlook.doc  

Gasoline and Diesel Fuel Update (EIA)

3 3 1 Short-Term Energy Outlook April 2003 Summer 2003 Motor Gasoline Outlook Summary For the upcoming summer season (April to September 2003), high crude oil costs and other factors are expected to yield average retail motor gasoline prices higher than those of last year. Current crude oil prices reflect a substantial uncertainty premium due to concerns about the current conflict in the Persian Gulf, lingering questions about whether Venezuelan oil production will recover to near pre-strike levels in time for the peak driving season, and the impact of recent disruptions in Nigerian oil output. Moreover, unusually low crude oil and gasoline inventory levels at the outset of the driving season are expected to keep prices high throughout much of the

485

Motor Gasoline Outlook and State MTBE Bans  

Gasoline and Diesel Fuel Update (EIA)

Motor Gasoline Outlook Motor Gasoline Outlook and State MTBE Bans Tancred Lidderdale Contents 1. Summary 2. MTBE Supply and Demand 3. Ethanol Supply 4. Gasoline Supply 5. Gasoline Prices A. Long-Term Equilibrium Price Analysis B. Short-Term Price Volatility 6. Conclusion 7. Appendix A. Estimating MTBE Consumption by State 8. Appendix B. MTBE Imports and Exports 9. Appendix C. Glossary of Terms 10. End Notes 11. References 1. Summary The U.S. is beginning the summer 2003 driving season with lower gasoline inventories and higher prices than last year. Recovery from this tight gasoline market could be made more difficult by impending State bans on the blending of methyl tertiary butyl ether (MTBE) into gasoline that are scheduled to begin later this year. Three impending State bans on MTBE blending could significantly affect gasoline

486

Dual power, constant speed electric motor system  

DOE Patents (OSTI)

A dual capacity permanent split capacitor electric motor system is provided with a stator having main and auxiliary windings. The main stator winding includes two winding sections which are connected in parallel with each other and across a pair of line terminals while the auxiliary winding is connected in series with a capacitor to form a circuit branch which is connected between the line terminals for operation at a first output power level. Switching means are provided to reconnect the main stator winding sections in series with each other and in series with a second capacitor to form a circuit branch which is connected between the line terminals while the stator auxiliary winding is connected directly between the line terminals for operation at a second output power level. Automatic rotation reversal occurs when the motor switches from the first to the second output power level.

Kirschbaum, Herbert S. (Asheville, NC)

1984-01-01T23:59:59.000Z

487

Dual power, constant speed electric motor system  

DOE Patents (OSTI)

A dual capacity permanent split capacitor electric motor system is provided with a stator having main and auxiliary windings. The main stator winding includes two winding sections which are connected in parallel with each other and across a pair of line terminals while the auxiliary winding is connected in series with a capacitor to form a circuit branch which is connected between the line terminals for operation at a first output power level. Switching means are provided to reconnect the main stator winding sections in series with each other and in series with a second capacitor to form a circuit branch which is connected between the line terminals while the stator auxiliary winding is connected directly between the line terminals for operation at a second output power level. Automatic rotation reversal occurs when the motor switches from the first to the second output power level. 6 figs.

Kirschbaum, H.S.

1984-07-31T23:59:59.000Z

488

Corona and Motor Voltage Interim Report  

SciTech Connect

It has been suggested that to meet the FreedomCAR objectives for cost, size, weight, efficiency, and reliability higher buss voltages be utilized in HEV and FC automotive applications. The reasoning is that since electric power is equal to the product of voltage and current for a given power a higher voltage and lower current would result in smaller cable and inverter switching components. Consequently, the system can be lighter and smaller. On the other hand, higher voltages are known to require better and thicker electrical insulation that reduce the available slot area for motor windings. One cause of slow insulation breakdown is corona that gradually erodes the insulation and shortens the life expectancy of the motor. This study reports on the results of a study on corona initiating voltages for mush-wound and bobbin-wound stators. A unique testing method is illustrated.

Hsu, J.S.

2005-05-06T23:59:59.000Z

489

Laser-frequency multiplication  

SciTech Connect

A high quality mode locked pulse train was obtained at 9.55 micrometers, the CO2 wavelength chosen for frequency doubling into the atmospheric window at 4.8 micrometers. The pulse train consists of a 3 micro sec burst of 1.5 nsec pulses separated by 40 nsec, in a TEM(00) mode and with a total energy of 100 mJ. The pulse intensity without focussing is about 3 MW/sq.cm., already quite close to the target intensity of 10 MW/sq.cm. for frequency doubling in a AgGaSe2 crystal. The mode-locked train is obtained by intracavity modulation at 12.5 MHz using a germanium crystal driven with a power of about 30 Watts. Line selection is achieved firstly by the use of a 0.92 mm thick CaF2 plate at the Brewster angle within the cavity, which completely suppresses 10.6 micrometer band radiation. Secondly, a particular rotational line, the P20 at 9.55 micrometers, is selected by the injection of a continuous beam is mode-matched to the pulsed laser cavity using a long focal length lens, and for best line-locking it is necessary to fine tune the length of the pulsed laser resonator. Injection causes substantial depression of the gain switched spike.

Not Available

1991-11-01T23:59:59.000Z

490

Biogas engines for agricultural motor-generators  

SciTech Connect

Tests were run on biogas, natural gas and liquid fuel with four engines of 1.1 and 2.8 L displacement at 1800 rpm, intended for motor-generators. One engine was diesel engine modified to high compression spark-ignition. Optimum timing, fuel consumption and knocking were determined at various load levels between full load and idling. Considerable differences in efficiency were found. Recommendations are given on choice, equipment and operation. 13 refs.

Persson, S.P.E.; Bartlett, H.D.

1981-01-01T23:59:59.000Z

491

Pacing plant motors for energy savings  

SciTech Connect

Electronic adjustable-speed drives (ASDs) allow power plant auxiliary motors to work only as hard as they need to. In some cases, ASDs can reduce energy requirements by 30-50%, while minimizing wear and tear. Electronic ASDs' advanced hardware and software make them more compact than their mechanical counterparts, so retrofits are a relatively simple undertaking. Electric Power Research Institute studies include development and testing on ASDs retrofits and seeking new applications. 2 references, 6 figures.

Lihach, N.; Ferraro, R.

1984-03-01T23:59:59.000Z

492

Honda Motor Co Ltd | Open Energy Information  

Open Energy Info (EERE)

Honda Motor Co Ltd Honda Motor Co Ltd Jump to: navigation, search Name Honda Motor Co Ltd Place Tokyo, Tokyo, Japan Zip 107-8556 Sector Vehicles Product Leading global car manufacturer which began research into fuel cell technologies in the 1980s, and has tested several generations of technolgy in its FCX vehicles. Coordinates 35.670479°, 139.740921° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":35.670479,"lon":139.740921,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

493

Counterrotating brushless dc permanent magnet motor  

DOE Patents (OSTI)

An brushless DC permanent magnet motor is provided for driving an autonomous underwater vehicle. In one embodiment, the motor comprises four substantially flat stators disposed in stacked relationship, with pairs of the stators being axially spaced and each of the stators comprising a tape-wound stator coil; and a first and second substantially flat rotors disposed between the spaced pairs of stators. Each of the rotors includes an annular array of permanent magnets embedded therein. A first shaft is connected to the first rotor and a second, concentric shaft is connected to the second rotor, and drive unit causes rotation of the two shafts in opposite directions. The second shaft comprises a hollow tube having a central bore therein in which the first shaft is disposed. Two different sets of bearings support the first and second shAfts. In another embodiment, the motor comprises two ironless stators and pairs and rotors mounted no opposite sides of the stators and driven by counterrotating shafts.

Hawsey, R.A.; Bailey, J.M.

1990-01-01T23:59:59.000Z

494

Counterrotating brushless dc permanent magnet motor  

DOE Patents (OSTI)

An brushless DC permanent magnet motor is provided for driving an autonomous underwater vehicle. In one embodiment, the motor comprises four substantially flat stators disposed in stacked relationship, with pairs of the stators being axially spaced and each of the stators comprising a tape-wound stator coil; and a first and second substantially flat rotors disposed between the spaced pairs of stators. Each of the rotors includes an annular array of permanent magnets embedded therein. A first shaft is connected to the first rotor and a second, concentric shaft is connected to the second rotor, and drive unit causes rotation of the two shafts in opposite directions. The second shaft comprises a hollow tube having a central bore therein in which the first shaft is disposed. Two different sets of bearings support the first and second shAfts. In another embodiment, the motor comprises two ironless stators and pairs and rotors mounted no opposite sides of the stators and driven by counterrotating shafts.

Hawsey, R.A.; Bailey, J.M.

1990-12-31T23:59:59.000Z

495

Efficient, High-Torque Electric Vehicle Motor: Advanced Electric Vehicle Motors with Low or No Rare Earth Content  

SciTech Connect

REACT Project: QM Power will develop a new type of electric motor with the potential to efficiently power future generations of EVs without the use of rare-earth-based magnets. Many of todays EV motors use rare earth magnets to efficiently provide torque to the wheels. QM Powers motors would contain magnets that use no rare earth minerals, are light and compact, and can deliver more power with greater efficiency and at reduced cost. Key innovations in this project include a new motor design with iron-based magnetic materials, a new motor control technique, and advanced manufacturing techniques that substantially reduce the cost of the motor. The ultimate goal of this project is to create a cost-effective EV motor that offers the rough peak equivalent of 270 horsepower.

None

2012-01-01T23:59:59.000Z

496

Reference variables generation using a fuzzy trajectory controller for PM tubular linear synchronous motor drive  

Science Conference Proceedings (OSTI)

The usage of linear permanent-magnet (PM) actuators, and their associated controllers, increases in a wide variety of applications, due to the exhibited high force density, robustness, and accuracy. The s-curve motion profiling is the motion trajectory ... Keywords: fuzzy logic control, modelling and simulation, trajectory tracking

R. Lus; J. C. Quadrado

2005-06-01T23:59:59.000Z

497

,"U.S. Motor Gasoline Refiner Sales Volumes"  

U.S. Energy Information Administration (EIA) Indexed Site

Refiner Sales Volumes" Refiner Sales Volumes" ,"Click worksheet name or tab at bottom for data" ,"Worksheet Name","Description","# Of Series","Frequency","Latest Data for" ,"Data 1","U.S. Motor Gasoline Refiner Sales Volumes",6,"Monthly","9/2013","1/15/1983" ,"Release Date:","12/2/2013" ,"Next Release Date:","1/2/2014" ,"Excel File Name:","pet_cons_refmg_c_nus_epm0_mgalpd_m.xls" ,"Available from Web Page:","http://www.eia.gov/dnav/pet/pet_cons_refmg_c_nus_epm0_mgalpd_m.htm" ,"Source:","Energy Information Administration" ,"For Help, Contact:","infoctr@eia.gov"

498

Animation of JILA Frequency Comb Spectroscopy Technique  

Science Conference Proceedings (OSTI)

Animation of JILA Frequency Comb Spectroscopy Technique. The new JILA "frequency comb spectroscopy" technique ...

2012-08-17T23:59:59.000Z

499

Modular PM Motor Drives for Automotive Traction Applications  

DOE Green Energy (OSTI)

This paper presents modular permanent magnet (PM) motor drives for automotive traction applications. A partially modularized drive system consisting of a single PM motor and multiple inverters is described. The motor has multiple three-phase stator winding sets and each winding set is driven with a separate three-phase inverter module. A truly modularized inverter and motor configuration based on an axial-gap PM motor is then introduced, in which identical PM motor modules are mounted on a common shaft and each motor module is powered by a separate inverter module. The advantages of the modular approach for both inverter and motor include: (1) power rating scalability--one design meets different power requirements by simply stacking an adequate number of modules, thus avoiding redesigning and reducing the development cost, (2) increased fault tolerance, and (3) easy repairing. A prototype was constructed by using two inverters and an axial-gap PM motor with two sets of three-phase stat or windings, and it is used to assist the diesel engine in a hybrid electric vehicle converted from a Chevrolet Suburban. The effect of different pulse-width-modulation strategies for both motoring and regenerative modes on current control is analyzed. Torque and regenerative control algorithms are implemented with a digital signal processor. Analytical and initial testing results are included in the paper.

Su, G.J.

2001-10-29T23:59:59.000Z

500

Radio frequency coaxial feedthrough  

DOE Patents (OSTI)

An improved radio frequency coaxial transmission line vacuum feed-through provided based on the use of a half-wavelength annular dielectric pressure barrier disk, or multiple disks comprising an effective half wavelength structure to eliminate reflections from the barrier surfaces. Gas-tight seals are formed about the outer and inner diameter surfaces of the barrier disk using a sealing technique which generates radial forces sufficient to form seals by forcing the conductor walls against the surfaces of the barrier disks in a manner which does not deform the radii of the inner and outer conductors, thereby preventing enhancement of the electric field at the barrier faces which limits voltage and power handling capabilities of a feedthrough.

Owens, Thomas L. (Kingston, TN)

1989-01-17T23:59:59.000Z