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Note: This page contains sample records for the topic "replace permanent magnets" 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.


1

Permanent magnet steam generator  

SciTech Connect (OSTI)

This patent describes a system for magnetic heating of a fluid by motor rotation of a permanent magnet rotor adjacent an assembly of ferro-magnetic condensing plate and of copper heat absorber plate with protrusions through the ferro-magnetic condensing plate into an enclosure with the fluid therein and having fluid inlet and fluid outlet. The assembly has a first shaft and a second shaft coaxially spaced therefrom, a respective the motor connected to the outer end of each shaft, and a respective the permanent magnet rotor connected to the inner end of each shaft, adjacent a the heat absorber plate. The improvement described here comprises: the enclosure including a steel boiler with a first the ferro-magnetic condensing plate closing off a first end thereof and a second the ferro-magnetic condensing plate closing off a second end thereof, a the copper heat absorbing plate affixed on each ferro-magnetic plate; means, free of pockets, for promoting turbulent flow of the fluid with uniformly good heat transfer including the protrusion being a plurality of heat sinks, each heat sink of the plurality of heat sinks comprising an integral elongate member with an alternately large diameter and smaller diameter portions regularly spaced therealong. The elongate members through the first the ferro-magnetic condensing plate are coaxially aligned with the elongate members through the second the ferro-magnetic condensing plate.

Gerard, F.; Gerard, F.J.

1986-09-30T23:59:59.000Z

2

Permanent magnet multipole with adjustable strength  

DOE Patents [OSTI]

Two or more magnetically soft pole pieces are symmetrically positioned along a longitudinal axis to provide a magnetic field within a space defined by the pole pieces. Two or more permanent magnets are mounted to an external magnetically-soft cylindrical sleeve which rotates to bring the permanent magnets into closer coupling with the pole pieces and thereby adjustably control the field strength of the magnetic field produced in the space defined by the pole pieces. The permanent magnets are preferably formed of rare earth cobalt (REC) material which has a high remanent magnetic field and a strong coercive force. The pole pieces and the permanent magnets have corresponding cylindrical surfaces which are positionable with respect to each other to vary the coupling therebetween. Auxiliary permanent magnets are provided between the pole pieces to provide additional magnetic flux to the magnetic field without saturating the pole pieces.

Halbach, Klaus (Berkeley, CA)

1985-01-01T23:59:59.000Z

3

Permanent-magnet multipole with adjustable strength  

DOE Patents [OSTI]

Two or more magnetically soft pole pieces are symmetrically positioned along a longitudinal axis to provide a magnetic field within a space defined by the pole pieces. Two or more permanent magnets are mounted to an external magnetically-soft cylindrical sleeve which rotates to bring the permanent magnets into closer coupling with the pole pieces and thereby adjustably control the field strength of the magnetic field produced in the space defined by the pole pieces. The permanent magnets are preferably formed of rare earth cobalt (REC) material which has a high remanent magnetic field and a strong coercive force. The pole pieces and the permanent magnets have corresponding cylindrical surfaces which are positionable with respect to each other to vary the coupling there between. Auxiliary permanent magnets are provided between the pole pieces to provide additional magnetic flux to the magnetic field without saturating the pole pieces.

Halbach, K.

1982-09-20T23:59:59.000Z

4

Nonuniform radiation damage in permanent magnet quadrupoles  

SciTech Connect (OSTI)

We present data that indicate nonuniform magnetization loss due to radiation damage in neodymium-iron-boron Halbach-style permanent magnet quadrupoles. The proton radiography (pRad) facility at Los Alamos uses permanent-magnet quadrupoles for magnifying lenses, and a system recently commissioned at GSI-Darmsdadt uses permanent magnets for its primary lenses. Large fluences of spallation neutrons can be produced in close proximity to these magnets when the proton beam is, intentionally or unintentionally, directed into the tungsten beam collimators; imaging experiments at LANL’s pRad have shown image degradation with these magnetic lenses at proton beam doses lower than those expected to cause damage through radiation-induced reduction of the quadrupole strength alone. We have observed preferential degradation in portions of the permanent magnet quadrupole where the field intensity is highest, resulting in increased high-order multipole components.

Danly, C. R.; Merrill, F. E.; Barlow, D.; Mariam, F. G. [Los Alamos National Laboratory, Los Alamos, New Mexico 87544 (United States)

2014-08-15T23:59:59.000Z

5

Permanent magnet edge-field quadrupole  

DOE Patents [OSTI]

Planar permanent magnet edge-field quadrupoles for use in particle accelerating machines and in insertion devices designed to generate spontaneous or coherent radiation from moving charged particles are disclosed. The invention comprises four magnetized rectangular pieces of permanent magnet material with substantially similar dimensions arranged into two planar arrays situated to generate a field with a substantially dominant quadrupole component in regions close to the device axis. 10 figs.

Tatchyn, R.O.

1997-01-21T23:59:59.000Z

6

Permanent magnet energy conversion machine with magnet mounting arrangement  

DOE Patents [OSTI]

A hybrid permanent magnet dc motor includes three sets of permanent magnets supported by the rotor and three sets of corresponding stators fastened to the surrounding frame. One set of magnets operates across a radial gap with a surrounding radial gap stator, and the other two sets of magnets operate off the respective ends of the rotor across respective axial gaps.

Hsu, John S. (Oak Ridge, TN); Adams, Donald J. (Knoxville, TN)

1999-01-01T23:59:59.000Z

7

Novel Flux Coupling Machine without Permanent Magnets - U Machine...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Novel Flux Coupling Machine without Permanent Magnets - U Machine Novel Flux Coupling Machine without Permanent Magnets - U Machine 2009 DOE Hydrogen Program and Vehicle...

8

Hybrid permanent magnet and variable reluctance generator  

SciTech Connect (OSTI)

This patent describes a hybrid electrical generator. It comprises: a permanent magnet generator having a permanent magnet rotor mounted on a shaft, the permanent magnet generator providing an output voltage over an operating range which falls in response to an increasing electrical load; a variable reluctance generator having a rotor mounted on the shaft with excitation of a stator of the variable reluctance generator being provided from the permanent magnet generator, the variable reluctance generator providing an output voltage which varies in response to an increasing electrical load over an operating range; and a voltage regulator, responsive to combined output voltages of the generators, for controlling the output voltage provided by the variable reluctance generator.

Vaidya, J.; Belanger, D.J.

1990-09-25T23:59:59.000Z

9

Dovetail spoke internal permanent magnet machine  

DOE Patents [OSTI]

An internal permanent magnet (IPM) machine is provided. The IPM machine includes a stator assembly and a stator core. The stator core also includes multiple stator teeth. The stator assembly is further configured with stator windings to generate a stator magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface defining a cavity. The IPM machine also includes a rotor assembly and a rotor core. The rotor core is disposed inside the cavity and configured to rotate about the longitudinal axis. The rotor assembly further includes a shaft. The shaft further includes multiple protrusions alternately arranged relative to multiple bottom structures provided on the shaft. The rotor assembly also includes multiple stacks of laminations disposed on the protrusions and dovetailed circumferentially around the shaft. The rotor assembly further includes multiple pair of permanent magnets for generating a magnetic field, which magnetic field interacts with the stator magnetic field to produce a torque. The multiple pair of permanent magnets are disposed between the stacks. The rotor assembly also includes multiple middle wedges mounted between each pair of the multiple permanent magnets.

Alexander, James Pellegrino (Ballston Lake, NY); EL-Refaie, Ayman Mohamed Fawzi (Niskayuna, NY); Lokhandwalla, Murtuza (Clifton Park, NY); Shah, Manoj Ramprasad (Latham, NY); VanDam, Jeremy Daniel (West Coxsackie, NY)

2011-08-23T23:59:59.000Z

10

Permanent magnet thermal energy system  

SciTech Connect (OSTI)

An improved rotary magnet thermal generator system of the type having an array of magnets in alternating disposition coaxially disposed about and parallel with the shaft of a motor driving the rotary array and having a copper heat absorber and a ferro-magnetic plate fixed on a face of the heat absorber, includes as efficiency improver a plurality of heat sink plates extending beyond the ferro-magnet plate into a plenum through a respective plurality of close-fitting apertures. In a further embodimetn the heat sink plates are in thermal contact with sinusoidally convoluted tubing that both increases surface area and provides for optional heating of gases and/or fluids at the same time.

Gerard, F.

1985-04-16T23:59:59.000Z

11

Permanent Magnet Ecr Plasma Source With Magnetic Field Optimization  

DOE Patents [OSTI]

In a plasma-producing device, an optimized magnet field for electron cyclotron resonance plasma generation is provided by a shaped pole piece. The shaped pole piece adjusts spacing between the magnet and the resonance zone, creates a convex or concave resonance zone, and decreases stray fields between the resonance zone and the workpiece. For a cylindrical permanent magnet, the pole piece includes a disk adjacent the magnet together with an annular cylindrical sidewall structure axially aligned with the magnet and extending from the base around the permanent magnet. The pole piece directs magnetic field lines into the resonance zone, moving the resonance zone further from the face of the magnet. Additional permanent magnets or magnet arrays may be utilized to control field contours on a local scale. Rather than a permeable material, the sidewall structure may be composed of an annular cylindrical magnetic material having a polarity opposite that of the permanent magnet, creating convex regions in the resonance zone. An annular disk-shaped recurve section at the end of the sidewall structure forms magnetic mirrors keeping the plasma off the pole piece. A recurve section composed of magnetic material having a radial polarity forms convex regions and/or magnetic mirrors within the resonance zone.

Doughty, Frank C. (Plano, TX); Spencer, John E. (Plano, TX)

2000-12-19T23:59:59.000Z

12

Batch fabrication of precision miniature permanent magnets  

DOE Patents [OSTI]

A new class of processes for fabrication of precision miniature rare earth permanent magnets is disclosed. Such magnets typically have sizes in the range 0.1 to 10 millimeters, and dimensional tolerances as small as one micron. Very large magnetic fields can be produced by such magnets, lending to their potential application in MEMS and related electromechanical applications, and in miniature millimeter-wave vacuum tubes. This abstract contains simplifications, and is supplied only for purposes of searching, not to limit or alter the scope or meaning of any claims herein.

Christenson, Todd R. (Albuquerque, NM); Garino, Terry J. (Albuquerque, NM); Venturini, Eugene L. (Albuquerque, NM)

2002-01-01T23:59:59.000Z

13

Performance improvement of permanent magnet ac motors  

E-Print Network [OSTI]

.????????????????....????.. 19 B. Background............??..?????.??.?????...?.?.... 20 C. Comparing BLDC Motor and PMSM???????????... 24 D. Harmonic Spectrum of MMF in Machines with Non-sinusoidal Winding Distribution??????????????????.. 26 ix TABLE............................................................................ 58 H. Conclusion??????????????????????. 68 III FAULT TOLERANT OPERATION OF PERMANENT MAGNET MOTOR DRIVES?????????????????????? 69 A. Introduction.????????????????....???.?. 69 B. Fault Tolerant Operation of Five-Phase PMSM...

Parsa, Leila

2005-08-29T23:59:59.000Z

14

Permanent magnet design for high-speed superconducting bearings  

DOE Patents [OSTI]

A high temperature superconducting bearing including a permanent magnet rotor levitated by a high temperature superconducting structure is disclosed. The rotor preferably includes one or more concentric permanent magnet rings coupled to permanent magnet ring structures having substantially triangular and quadrangular cross-sections. Both alternating and single direction polarity magnet structures can be used in the bearing. 9 figs.

Hull, J.R.; Uherka, K.L.; Abdoud, R.G.

1996-09-10T23:59:59.000Z

15

Permanent magnet design for high-speed superconducting bearings  

DOE Patents [OSTI]

A high temperature superconducting bearing including a permanent magnet rotor levitated by a high temperature superconducting structure. The rotor preferably includes one or more concentric permanent magnet rings coupled to permanent magnet ring structures having substantially triangular and quadrangular cross-sections. Both alternating and single direction polarity magnet structures can be used in the bearing.

Hull, John R. (5519 S. Bruner, Hinsdale, IL 60521); Uherka, Kenneth L. (830 Ironwood, Frankfort, IL 60423); Abdoud, Robert G. (13 Country Oaks La., Barrington Hills, IL 60010)

1996-01-01T23:59:59.000Z

16

Optimal Current Waveforms for Brushless Permanent Magnet Motors  

E-Print Network [OSTI]

;1 Introduction We consider the problem of controlling an AC permanent magnet synchronous motor (PMSM) by choosing

17

Analysis of Mechanically Milled Exchange Coupled Nanocomposite Permanent Magnets.  

E-Print Network [OSTI]

??Nanocomposite permanent magnets have recently evoked wide interest because of their interesting properties. They usually consist of a hard magnetic phase having superior coercivities and… (more)

Mukherjee, Santanu

2012-01-01T23:59:59.000Z

18

Variable-field permanent magnet dipole  

SciTech Connect (OSTI)

A new concept for a variable-field permanent-magnet dipole (VFPMD) has been designed, fabricated, and tested at Los Alamos. The VFPMD is a C-shaped sector magnet with iron poles separated by a large block of magnet material (SmCo). The central field can be continuously varied from 0.07 T to 0.3 T by moving an iron shunt closer or further away from the back of the magnet. The shunt is specially shaped to make the dependence of the dipole field strength on the shunt position as linear as possible. The dipole has a 2.8 cm high by 8 cm wide aperture with {approximately}10 cm long poles.

Barlow, D.B.; Kraus, R.H. Jr.; Meyer, R.E.

1993-10-01T23:59:59.000Z

19

Strong permanent magnet-assisted electromagnetic undulator  

DOE Patents [OSTI]

This invention discloses an improved undulator comprising a plurality of electromagnet poles located along opposite sides of a particle beam axis with alternate north and south poles on each side of the beam to cause the beam to wiggle or undulate as it travels generally along the beam axis and permanent magnets spaced adjacent the electromagnetic poles on each side of the axis of said particle beam in an orientation sufficient to reduce the saturation of the electromagnet poles whereby the field strength of the electromagnet poles can be increased beyond the normal saturation levels of the electromagnetic poles.

Halbach, Klaus (Berkeley, CA)

1988-01-01T23:59:59.000Z

20

Counterrotating brushless dc permanent magnet motor  

SciTech Connect (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

Note: This page contains sample records for the topic "replace permanent magnets" 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

Counterrotating brushless dc permanent magnet motor  

SciTech Connect (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

22

A New Class of Switched Reluctance Motors without Permanent Magnets...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

A New Class of Switched Reluctance Motors without Permanent Magnets A Segmented Drive Inverter Topology with a Small DC Bus Capacitor A Segmented Drive Inverter Topology with a...

23

A New Class of Switched Reluctance Motors without Permanent Magnets  

Broader source: Energy.gov (indexed) [DOE]

switched reluctance motor benefits: - Low material and fabrication cost - No permanent magnet material * Back-emf and demagnetization is not an issue * Permits operation...

24

Adjustable permanent magnet assembly for NMR and MRI  

DOE Patents [OSTI]

System and methods for designing and using single-sided magnet assemblies for magnetic resonance imaging (MRI) are disclosed. The single-sided magnet assemblies can include an array of permanent magnets disposed at selected positions. At least one of the permanent magnets can be configured to rotate about an axis of rotation in the range of at least +/-10 degrees and can include a magnetization having a vector component perpendicular to the axis of rotation. The single-sided magnet assemblies can further include a magnet frame that is configured to hold the permanent magnets in place while allowing the at least one of the permanent magnets to rotate about the axis of rotation.

Pines, Alexander; Paulsen, Jeffrey; Bouchard, Louis S; Blumich, Bernhard

2013-10-29T23:59:59.000Z

25

Design Assessments of a Magnetic-geared Double-rotor Permanent Magnet Generator.  

E-Print Network [OSTI]

??The purpose of this research is to provide systematic design of a permanent magnet (PM) generator, by adopting the double-rotor and the coaxial magnetic gear… (more)

Chung, He-Yu

2013-01-01T23:59:59.000Z

26

Method and apparatus for assembling permanent magnet rotors  

DOE Patents [OSTI]

A permanent magnet assembly for assembly in large permanent magnet motors and generators includes a two-piece carrier that can be slid into a slot in the rotor and then secured in place using a set screw. The invention also provides an auxiliary carrier device with guide rails that line up with the teeth of the rotor, so that a permanent magnet assembly can be pushed first into a slot, and then down the slot to its proper location. An auxiliary tool is provided to move the permanent magnet assembly into position in the slot before it is secured in place. Methods of assembling and disassembling the magnet assemblies in the rotor are also disclosed. 2 figs.

Hsu, J.S.; Adams, D.J.

1999-06-22T23:59:59.000Z

27

E-Print Network 3.0 - advanced permanent magnet Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Collection: Mathematics 74 Optimum Control for Interior Permanent Magnet Synchronous Motors (IPMSM) in Constant Summary: Optimum Control for Interior Permanent Magnet...

28

Permanent magnet assisted synchronous reluctance motor, design and performance improvement  

E-Print Network [OSTI]

Recently, permanent magnet assisted (PMa)-synchronous reluctance motors (SynRM) have been considered as a possible alternative motor drive for high performance applications. In order to have an efficient motor drive, performing of three steps...

Niazi, Peyman

2006-04-12T23:59:59.000Z

29

Permanent magnet with MgB{sub 2} bulk superconductor  

SciTech Connect (OSTI)

Superconductors with persistent zero-resistance currents serve as permanent magnets for high-field applications requiring a strong and stable magnetic field, such as magnetic resonance imaging. The recent global helium shortage has quickened research into high-temperature superconductors (HTSs)—materials that can be used without conventional liquid-helium cooling to 4.2?K. Herein, we demonstrate that 40-K-class metallic HTS magnesium diboride (MgB{sub 2}) makes an excellent permanent bulk magnet, maintaining 3?T at 20?K for 1 week with an extremely high stability (<0.1 ppm/h). The magnetic field trapped in this magnet is uniformly distributed, as for single-crystalline neodymium-iron-boron. Magnetic hysteresis loop of the MgB{sub 2} permanent bulk magnet was determined. Because MgB{sub 2} is a simple-binary-line compound that does not contain rare-earth metals, polycrystalline bulk material can be industrially fabricated at low cost and with high yield to serve as strong magnets that are compatible with conventional compact cryocoolers, making MgB{sub 2} bulks promising for the next generation of Tesla-class permanent-magnet applications.

Yamamoto, Akiyasu, E-mail: yamamoto@appchem.t.u-tokyo.ac.jp [The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656 (Japan); JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012 (Japan); Ishihara, Atsushi; Tomita, Masaru [Railway Technical Research Institute, 2-8-38 Hikari, Kokubunji, Tokyo 185-8540 (Japan); Kishio, Kohji [The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656 (Japan)

2014-07-21T23:59:59.000Z

30

Permanent-magnet-less machine having an enclosed air gap  

DOE Patents [OSTI]

A permanent magnet-less, brushless synchronous system includes a stator that generates a magnetic rotating field when sourced by an alternating current. An uncluttered rotor disposed within the magnetic rotating field is spaced apart from the stator to form an air gap relative to an axis of rotation. A stationary excitation core spaced apart from the uncluttered rotor by an axial air gap and a radial air gap substantially encloses the stationary excitation core. Some permanent magnet-less, brushless synchronous systems include stator core gaps to reduce axial flux flow. Some permanent magnet-less, brushless synchronous systems include an uncluttered rotor coupled to outer laminations. The quadrature-axis inductance may be increased in some synchronous systems. Some synchronous systems convert energy such as mechanical energy into electrical energy (e.g., a generator); other synchronous systems may convert any form of energy into mechanical energy (e.g., a motor).

Hsu, John S. (Oak Ridge, TN)

2012-02-07T23:59:59.000Z

31

Permanent-magnet-less machine having an enclosed air gap  

DOE Patents [OSTI]

A permanent magnet-less, brushless synchronous system includes a stator that generates a magnetic rotating field when sourced by an alternating current. An uncluttered rotor disposed within the magnetic rotating field is spaced apart from the stator to form an air gap relative to an axis of rotation. A stationary excitation core spaced apart from the uncluttered rotor by an axial air gap and a radial air gap substantially encloses the stationary excitation core. Some permanent magnet-less, brushless synchronous systems include stator core gaps to reduce axial flux flow. Some permanent magnet-less, brushless synchronous systems include an uncluttered rotor coupled to outer laminations. The quadrature-axis inductance may be increased in some synchronous systems. Some synchronous systems convert energy such as mechanical energy into electrical energy (e.g., a generator); other synchronous systems may convert any form of energy into mechanical energy (e.g., a motor).

Hsu, John S.

2013-03-05T23:59:59.000Z

32

Rotational and magnetic shunt permanent magnet quadrupoles with variable magnetic strength  

SciTech Connect (OSTI)

Next Linear Collider (NLC) and Very Large Hadron Collider (VLHC) projects suppose to use permanent magnets as bending, focusing and correcting elements. Prototypes of two permanent magnet quadrupoles with variable strength were built and successfully tested in Fermilab. Quadrupoles have 12.7 mm aperture diameter, 100 T/m gradient with an adjustment range of 0 to -20%. Special designs provide high precision magnetic center stability during strength change. SmCo5 permanent magnet bricks were used in these prototypes. Rotational quadrupole consists of four sections. Two central sections are rotated in counter directions to adjust the strength. Magnetic shunt quadrupole design provides variable shunting of the magnetic flux. The numerical simulation, designs, measuring results are described.

Vladimir Kashikhin et al.

2002-03-28T23:59:59.000Z

33

Method of making bonded or sintered permanent magnets  

DOE Patents [OSTI]

An isotropic permanent magnet is made by mixing a thermally responsive, low viscosity binder and atomized rare earth-transition metal (e.g., iron) alloy powder having a carbon-bearing (e.g., graphite) layer thereon that facilitates wetting and bonding of the powder particles by the binder. Prior to mixing with the binder, the atomized alloy powder may be sized or classified to provide a particular particle size fraction having a grain size within a given relatively narrow range. A selected particle size fraction is mixed with the binder and the mixture is molded to a desired complex magnet shape. A molded isotropic permanent magnet is thereby formed. A sintered isotropic permanent magnet can be formed by removing the binder from the molded mixture and thereafter sintering to full density.

McCallum, R.W.; Dennis, K.W.; Lograsso, B.K.; Anderson, I.E.

1993-08-31T23:59:59.000Z

34

Real-Time Capable Methods to Determine the Magnet Temperature of Permanent Magnet  

E-Print Network [OSTI]

}@lea.upb.de Abstract--The permanent magnet synchronous motor (PMSM) is widely used in highly utilised automotive-based magnet temperature determination methods in PMSM. In this context, the existing publications can field. Keywords--PMSM, permanent magnet temperature, model- based real-time determination, motor control

Paderborn, Universität

35

System Cost Analysis for an Interior Permanent Magnet Motor  

SciTech Connect (OSTI)

The objective of this program is to provide an assessment of the cost structure for an interior permanent magnet ('IPM') motor which is designed to meet the 2010 FreedomCAR specification. The program is to evaluate the range of viable permanent magnet materials for an IPM motor, including sintered and bonded grades of rare earth magnets. The study considers the benefits of key processing steps, alternative magnet shapes and their assembly methods into the rotor (including magnetization), and any mechanical stress or temperature limits. The motor's costs are estimated for an annual production quantity of 200,000 units, and are broken out into such major components as magnetic raw materials, processing and manufacturing. But this is essentially a feasibility study of the motor's electromagnetic design, and is not intended to include mechanical or thermal studies as would be done to work up a selected design for production.

Peter Campbell

2008-08-01T23:59:59.000Z

36

Design, Manufacture and Measurements of Permanent Quadrupole Magnets for Linac4  

E-Print Network [OSTI]

Compact quadrupole magnets are required for the CCDTL (Cell-Coupled Drift Tube Linac) of Linac 4, a 160 MeV linear accelerator of negative hydrogen ions which will replace the old 50 MeV proton Linac2 at CERN. The magnets, of an overall physical length of 140 mm and an aperture diameter of 45 mm, are based on Sm2Co17 blocks and can provide an integrated gradient of up to 1.6 Tesla. The magnetic field quality is determined by 4 ferromagnetic pole tips, aligned together with the permanent magnets blocks inside a structure made in a single piece. Tuning bars allow to individually trim the magnetic flux provided by each pole, to correct possible differences between blocks and to modify the field gradient intensity within about 20% of the nominal value. The paper describes and discusses the design, manufacture and magnetic measurements of a first prototype magnet.

Tommasini, D; Thonet, P; Vorozhtsov, A

2012-01-01T23:59:59.000Z

37

Permanent Magnet Development for Automotive Traction Motors  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l L d F SSalesOE0000652Grow YourPerformanceFacility ManagersPermanent

38

High-Energy Composite Permanent Magnets: High-Energy Permanent Magnets for Hybrid Vehicles and Alternative Energy  

SciTech Connect (OSTI)

Broad Funding Opportunity Announcement Project: The University of Delaware is developing permanent magnets that contain less rare earth material and produce twice the energy of the strongest rare earth magnets currently available. The University of Delaware is creating these magnets by mixing existing permanent magnet materials with those that are more abundant, like iron. Both materials are first prepared in the form of nanoparticles via techniques ranging from wet chemistry to ball milling. After that, the nanoparticles must be assembled in a 3-D array and consolidated at low temperatures to form a magnet. With small size particles and good contact between these two materials, the best qualities of each allow for the development of exceptionally strong composite magnets.

None

2010-02-15T23:59:59.000Z

39

A variable-field permanent-magnet dipole for accelerators  

SciTech Connect (OSTI)

A new concept for a variable-field permanent-magnet dipole has been developed and fabricated at Los Alamos. The application requires an extremely uniform dipole field in the magnet aperture and precision variability over a large operating range. An iron-core permanent- magnet design using a shunt that was specially shaped to vary the field in a precise and reproducible fashion with shunt position. The key to this design is in the shape of the shunt. The field as a function of shunt position is very linear from 90% of the maximum field to 20% of the minimum field. The shaped shunt also results in a small maximum magnetic force attracting the shunt to the yoke allowing a simple mechanical design. Calculated and measured results agree well for the magnet.

Kraus, R.H. Jr.; Barlow, D.B.; Meyer, R.

1992-01-01T23:59:59.000Z

40

A variable-field permanent-magnet dipole for accelerators  

SciTech Connect (OSTI)

A new concept for a variable-field permanent-magnet dipole has been developed and fabricated at Los Alamos. The application requires an extremely uniform dipole field in the magnet aperture and precision variability over a large operating range. An iron-core permanent- magnet design using a shunt that was specially shaped to vary the field in a precise and reproducible fashion with shunt position. The key to this design is in the shape of the shunt. The field as a function of shunt position is very linear from 90% of the maximum field to 20% of the minimum field. The shaped shunt also results in a small maximum magnetic force attracting the shunt to the yoke allowing a simple mechanical design. Calculated and measured results agree well for the magnet.

Kraus, R.H. Jr.; Barlow, D.B.; Meyer, R.

1992-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "replace permanent magnets" 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

Permanent magnet flowmeter having improved output terminal means  

DOE Patents [OSTI]

Disclosed is an improved permanent magnet flowmeter capable of withstanding bending stresses in the direction of induced emf signals. The flowmeter includes a unique terminal arrangement integrally formed with the flowmeter by trepanning opposing wall sections of the flowmeter body. The terminal arrangement provides increased flowmeter sensitivity by increasing the strength of the induced emf signals.

August, Charles (Darien, IL); Myers, Harry J. (Downers Grove, IL)

1984-01-01T23:59:59.000Z

42

SUPER HIGH-SPEED MINIATURIZED PERMANENT MAGNET SYNCHRONOUS MOTOR  

E-Print Network [OSTI]

with the design of permanent magnet synchronous motors (PMSM) to operate at super-high speed with high efficiency. The designed and fabricated PMSM was successfully tested to run upto 210,000 rpm The designed PMSM has 2000 W concept of electrical machines. After that, the modeling of PMSM for dynamic simulation is provided

Wu, Thomas

43

Permanent Magnets Synchronous Machines Faults Detection and Identification  

E-Print Network [OSTI]

for permanent magnet synchronous machines (PMSM). Two main faults occurring on these machines are identified of the PMSM is devel- oped and simulated using Matlab Simulink. The model enables simulating nominal and faulty PMSM behavior, with several stages of degradation, and is supported by tests results. Specific

Paris-Sud XI, Université de

44

Parameter estimation of permanent magnet stepper motors without mechanical sensors  

E-Print Network [OSTI]

.1016/j.conengprac.2014.01.015 #12;1. Introduction Permanent Magnet Stepper Motors (PMSM's) are widely used in indus- try for position control, especially in manufacturing applications. PMSM's are more-time adaptation, and fault detection. The estimation of PMSM parameters was studied in (Blauch et al., 1993), 2

Paris-Sud XI, Université de

45

Modelling and design of an eddy current coupling for slip-synchronous permanent magnet wind generators.  

E-Print Network [OSTI]

??ENGLISH ABSTRACT: Slip-synchronous permanent magnet generators (SS-PMG) is a recently proposed direct-grid connected direct-drive generator topology for wind power applications. It combines a permanent magnet… (more)

Mouton, Zac

2013-01-01T23:59:59.000Z

46

Method for forming permanent magnets with different polarities for use in microelectromechanical devices  

DOE Patents [OSTI]

Methods are provided for forming a plurality of permanent magnets with two different north-south magnetic pole alignments for use in microelectromechanical (MEM) devices. These methods are based on initially magnetizing the permanent magnets all in the same direction, and then utilizing a combination of heating and a magnetic field to switch the polarity of a portion of the permanent magnets while not switching the remaining permanent magnets. The permanent magnets, in some instances, can all have the same rare-earth composition (e.g. NdFeB) or can be formed of two different rare-earth materials (e.g. NdFeB and SmCo). The methods can be used to form a plurality of permanent magnets side-by-side on or within a substrate with an alternating polarity, or to form a two-dimensional array of permanent magnets in which the polarity of every other row of the array is alternated.

Roesler, Alexander W. (Tijeras, NM); Christenson, Todd R. (Albuquerque, NM)

2007-04-24T23:59:59.000Z

47

Strong permanent magnets provide a backbone technology required many products, including computers, electric cars, and  

E-Print Network [OSTI]

Strong permanent magnets provide a backbone technology required many products, including computers, electric cars, and wind-powered generators. Currently, the strongest permanent magnets contain rare earth for most technologies requiring permanent magnets, due to their high energy product and coercivity. However

McQuade, D. Tyler

48

Design of Double Salient Interior Permanent Magnet Machine Based on Mutually Coupled  

E-Print Network [OSTI]

Design of Double Salient Interior Permanent Magnet Machine Based on Mutually Coupled Reluctance--This paper presents a novel structure of double salient interior permanent magnet machine (DSIPM machine-- double salient, d-axis and q-axis inductances, cogging torque, permanent magnets, flux

Paris-Sud XI, Université de

49

Calculations on permanent-magnet quadrupoles with nonrectangular cross section  

SciTech Connect (OSTI)

The current trend toward higher frequencies to power drift-tube linacs (DTLs) and coupled-cavity linacs (CCLs) reduces the space available for quadrupole focusing magnets. Similarly, the space available for matching sections between linac sections is limited, and often the matching section bunchers are designed in odd shapes to make them fit. This shaping further restricts focusing magnet space. One approach to attaining sufficient quadrupole strength is such situations is to use rare-earth permanent-magnet quadrupoles (PMQs) with cross sections tailored to fill as much of the available space as possible. In this paper, we describe some techniques we have developed to calculate the properties of such magnets both singly and when other magnets are nearby. 3 refs., 4 figs.

Boicourt, G.P.; Merson, J.L.

1988-01-01T23:59:59.000Z

50

Disc rotors with permanent magnets for brushless DC motor  

SciTech Connect (OSTI)

A brushless dc permanent magnet motor drives an autonomous underwater vehe. In one embodiment, the motor comprises four substantially flat stators in stacked relationship, with pairs of the stators axially spaced, each of the stators comprising a tape-wound stator coil, and 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 a drive unit causes rotation of the two shafts in opposite directions. The second shaft comprises a hollow tube having a central bore 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 of rotors mounted on opposite sides of the stators and driven by counterrotating shafts.

Hawsey, Robert A. (Oak Ridge, TN); Bailey, J. Milton (Knoxville, TN)

1992-01-01T23:59:59.000Z

51

Permanent magnet machine with windings having strand transposition  

DOE Patents [OSTI]

This document discusses, among other things, a stator with transposition between the windings or coils. The coils are free from transposition to increase the fill factor of the stator slots. The transposition at the end connections between an inner coil and an outer coil provide transposition to reduce circulating current loss. The increased fill factor reduces further current losses. Such a stator is used in a dual rotor, permanent magnet machine, for example, in a compressor pump, wind turbine gearbox, wind turbine rotor.

Qu, Ronghai (Clifton Park, NY); Jansen, Patrick Lee (Scotia, NY)

2009-04-21T23:59:59.000Z

52

Disc rotors with permanent magnets for brushless dc motor  

SciTech Connect (OSTI)

This patent describes a brushless dc permanent magnet motor for driving an autonomous underwater vehicle. It comprises first and second substantially flat, generally cylindrical stators disposed in side by side relation; a first substantially flat, generally cylindrical rotor; a first shaft connected to the first rotor and a second, concentric shaft connected to the second rotor; and means for providing rotation of the first and second shafts in opposite directions.

Hawsey, R.A.; Bailery, J.M.

1992-05-26T23:59:59.000Z

53

Innovative Sensors for Pipeline Crawlers: Rotating Permanent Magnet Inspection  

SciTech Connect (OSTI)

Internal inspection of pipelines is an important tool for ensuring safe and reliable delivery of fossil energy products. Current inspection systems that are propelled through the pipeline by the product flow cannot be used to inspect all pipelines because of the various physical barriers they may encounter. To facilitate inspection of these ''unpiggable'' pipelines, recent inspection development efforts have focused on a new generation of powered inspection platforms that are able to crawl slowly inside a pipeline and can maneuver past the physical barriers that limit internal inspection applicability, such as bore restrictions, low product flow rate, and low pressure. The first step in this research was to review existing inspection technologies for applicability and compatibility with crawler systems. Most existing inspection technologies, including magnetic flux leakage and ultrasonic methods, had significant implementation limitations including mass, physical size, inspection energy coupling requirements and technology maturity. The remote field technique was the most promising but power consumption was high and anomaly signals were low requiring sensitive detectors and electronics. After reviewing each inspection technology, it was decided to investigate the potential for a new inspection method. The new inspection method takes advantage of advances in permanent magnet strength, along with their wide availability and low cost. Called rotating permanent magnet inspection (RPMI), this patent pending technology employs pairs of permanent magnets rotating around the central axis of a cylinder to induce high current densities in the material under inspection. Anomalies and wall thickness variations are detected with an array of sensors that measure local changes in the magnetic field produced by the induced current flowing in the material. This inspection method is an alternative to the common concentric coil remote field technique that induces low-frequency eddy currents in ferromagnetic pipes and tubes. Since this is a new inspection method, both theory and experiment were used to determine fundamental capabilities and limitations. Fundamental finite element modeling analysis and experimental investigations performed during this development have led to the derivation of a first order analytical equation for designing rotating magnetizers to induce current and positioning sensors to record signals from anomalies. Experimental results confirm the analytical equation and the finite element calculations provide a firm basis for the design of RPMI systems. Experimental results have shown that metal loss anomalies and wall thickness variations can be detected with an array of sensors that measure local changes in the magnetic field produced by the induced current flowing in the material. The design exploits the phenomenon that circumferential currents are easily detectable at distances well away from the magnets. Current changes at anomalies were detectable with commercial low cost Hall Effect sensors. Commercial analog to digital converters can be used to measure the sensor output and data analysis can be performed in real time using PC computer systems. The technology was successfully demonstrated during two blind benchmark tests where numerous metal loss defects were detected. For this inspection technology, the detection threshold is a function of wall thickness and corrosion depth. For thinner materials, the detection threshold was experimentally shown to be comparable to magnetic flux leakage. For wall thicknesses greater than three tenths of an inch, the detection threshold increases with wall thickness. The potential for metal loss anomaly sizing was demonstrated in the second benchmarking study, again with accuracy comparable to existing magnetic flux leakage technologies. The rotating permanent magnet system has the potential for inspecting unpiggable pipelines since the magnetizer configurations can be sufficiently small with respect to the bore of the pipe to pass obstructions that limit the application of many i

J. Bruce Nestleroth; Richard J. Davis; Stephanie Flamberg

2006-09-30T23:59:59.000Z

54

High temperature, permanent magnet biased, homopolar magnetic bearing actuator  

E-Print Network [OSTI]

current resistance and improves the system efficiency because the magnetic field of the HTPM can suspend the major portion of the static load on bearing. A high temperature radial magnetic bearing was designed via an iterative search employing 3D finite...

Hossain, Mohammad Ahsan

2006-10-30T23:59:59.000Z

55

Interior Permanent Magnet Reluctance Machine with Brushless Field Excitation  

SciTech Connect (OSTI)

In a conventional permanent magnet (PM) machine, the air-gap flux produced by the PM is fixed. It is difficult to enhance the air-gap flux density due to limitations of the PM in a series-magnetic circuit. However, the air-gap flux density can be weakened by using power electronic field weakening to the limit of demagnetization of the PMs. This paper presents the test results of controlling the PM air-gap flux density through the use of a stationary brushless excitation coil in a reluctance interior permanent magnet with brushless field excitation (RIPM-BFE) motor. Through the use of this technology the air-gap flux density can be either enhanced or weakened. There is no concern with demagnetizing the PMs during field weakening. The leakage flux of the excitation coil through the PMs is blocked. The prototype motor built on this principle confirms the concept of flux enhancement and weakening through the use of excitation coils.

Wiles, R.H.

2005-10-07T23:59:59.000Z

56

A strong permanent magnet-assisted electromagnetic undulator  

DOE Patents [OSTI]

This invention discloses an improved undulator comprising a plurality of electromagnet poles located along opposite sides of a particle beam axis with alternate north and south poles on each side of the beam to cause the beam to wiggle or undulate as it travels generally along the beam axis and permanent magnets spaced adjacent the electromagnetic poles on each side of the axis of said particle beam in an orientation sufficient to reduce the saturation of the electromagnet poles whereby the field strength of the electromagnet poles can be increased beyond the normal saturation levels of the electromagnetic poles. 4 figs.

Halbach, K.

1987-01-30T23:59:59.000Z

57

Permanent Magnet Development for Automotive Traction Motors | Department of  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:Year in3.pdfEnergyDepartment ofOil's ImpactAppendix AlEnergy Permanent Magnet Development

58

Combinatorial exploration of rare-earth-free permanent magnets: Magnetic and microstructural properties of Fe-Co-W thin films  

E-Print Network [OSTI]

at least one rare earth element such as Nd, Sm, Tb, or Pr.1­3 However, rare-earth elements are increasCombinatorial exploration of rare-earth-free permanent magnets: Magnetic and microstructural://apl.aip.org/about/rights_and_permissions #12;Combinatorial exploration of rare-earth-free permanent magnets: Magnetic and microstructural

Rubloff, Gary W.

59

Permanent-magnet helicon sources and arrays: a new type of rf plasma Francis F. Chena)  

E-Print Network [OSTI]

Permanent-magnet helicon sources and arrays: a new type of rf plasma Francis F. Chena) and Humberto mechanism of RF coupling. However, the requirement of a dc magnetic field has prevented their wide acceptance in industry. The use of permanent magnets greatly simplifies helicon sources, and arrays of small

Chen, Francis F.

60

Permanent-magnet helicon sources and arrays: A new type of rf plasmaa... Francis F. Chenb  

E-Print Network [OSTI]

Permanent-magnet helicon sources and arrays: A new type of rf plasmaa... Francis F. Chenb mechanism of rf coupling. However, the requirement of a dc magnetic field has prevented their wide acceptance in industry. The use of permanent magnets greatly simplifies helicon sources, and arrays of small

Chen, Francis F.

Note: This page contains sample records for the topic "replace permanent magnets" 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

Experimental analysis of variable capacity heat pump system equipped with vapour injection and permanent magnet motor.  

E-Print Network [OSTI]

?? This study analyzes the performance of variable capacity heat pump scroll compressor which is equipped with vapour injection and permanent magnet motor. Refrigerant used… (more)

Awan, Umer Khalid

2012-01-01T23:59:59.000Z

62

A "permanent" high-temperature superconducting magnet operated in thermal communication with a mass of solid nitrogen  

E-Print Network [OSTI]

This thesis explores a new design for a portable "permanent" superconducting magnet system. The design is an alternative to permanent low-temperature superconducting (LTS) magnet systems where the magnet is cooled by a ...

Haid, Benjamin J. (Benjamin John Jerome), 1974-

2001-01-01T23:59:59.000Z

63

High energy product permanent magnet having improved intrinsic coercivity and method of making same  

DOE Patents [OSTI]

A high energy rare earth-ferromagnetic metal permanent magnet is disclosed which is characterized by improved intrinsic coercivity and is made by forming a particulate mixture of a permanent magnet alloy comprising one or more rare earth elements and one or more ferromagnetic metals and forming a second particulate mixture of a sintering alloy consisting essentially of 92-98 wt. % of one or more rare earth elements selected from the class consisting of Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and mixtures of two or more of such rare earth elements, and 2-8 wt. % of one or more alloying metals selected from the class consisting of Al, Nb, Zr, V, Ta, Mo, and mixtures of two or more of such metals. The permanent magnet alloy particles and sintering aid alloy are mixed together and magnetically oriented by immersing the mixture in an axially aligned magnetic field while cold pressing the mixture. The compressed mixture is then sintered at a temperature above the melting point of the sintering aid and below the melting point of the permanent magnet alloy to thereby coat the particle surfaces of the permanent magnetic alloy particles with the sintering aid while inhibiting migration of the rare earth element in the sintering aid into the permanent magnet alloy particles to thereby raise the intrinsic coercivity of the permanent magnet alloy without substantially lowering the high energy of the permanent magnet alloy.

Ramesh, Ramamoorthy (Berkeley, CA); Thomas, Gareth (Berkeley, CA)

1990-01-01T23:59:59.000Z

64

Cerium-Based Magnets: Novel High Energy Permanent Magnet Without Critical Elements  

SciTech Connect (OSTI)

REACT Project: Ames Laboratory will develop a new class of permanent magnets based on the more commonly available element cerium for use in both EVs and renewable power generators. Cerium is 4 times more abundant and significantly less expensive than the rare earth element neodymium, which is frequently used in today’s most powerful magnets. Ames Laboratory will combine other metal elements with cerium to create a new magnet that can remain stable at the high temperatures typically found in electric motors. This new magnetic material will ultimately be demonstrated in a prototype electric motor, representing a cost-effective and efficient alternative to neodymium-based motors.

None

2012-01-01T23:59:59.000Z

65

Design and analysis of a permanent magnet generator for naval applications  

E-Print Network [OSTI]

This paper discusses the electrical and magnetic design and analysis of a permanent magnet generation module for naval applications. Numerous design issues are addressed and several issues are raised about the potential ...

Rucker, Jonathan E. (Jonathan Estill)

2005-01-01T23:59:59.000Z

66

Control strategy of a variable speed wind turbine with multipole permanent magnet synchronous generator  

E-Print Network [OSTI]

values. Keywords: permanent magnet synchronous generator, variable speed wind turbine, direct driven wind). A multipole synchronous generator connected to a power converter can operate at low speeds, so that a gear canControl strategy of a variable speed wind turbine with multipole permanent magnet synchronous

67

MULTI-WATT ELECTRIC POWER FROM A MICROFABRICATED PERMANENT-MAGNET GENERATOR  

E-Print Network [OSTI]

MULTI-WATT ELECTRIC POWER FROM A MICROFABRICATED PERMANENT-MAGNET GENERATOR S. Das1 , D. P. Arnold2 presents the design, fabrication, and characterization of permanent-magnet (PM) generators for use, coupled to a transformer and rectifier, delivers 1.1 W of DC electrical power to a resistive load

68

Study of permanent-magnet couplings with progressive magnetization using an analytical formulation  

SciTech Connect (OSTI)

Permanent-magnet (PM) magnetic couplings are used in many industrial applications. They allow the transmission of a torque from a rotating part to another rotating part without any mechanical contact. They are used in sealed equipment to transmit a movement through a separation wall. They are also very useful in high security applications to avoid failures due to torque overload. Nonclassical structures of permanent-magnet cylindrical air-gap couplings with progressive magnetization are studied. In these couplings, parallelepiped magnets with nonclassical magnetization direction are used and stuck in ironless cores. The magnetization direction of each magnet is chosen to provide an optimal repartition of the induction in the air gap. This progressive magnetization allows very high values of pullout torque. The use of this type of structure with ironless cores and very high pull-out torque seems to be an advantageous way to minimize the inertia and maximize the pullout torque of a magnetic coupling. An efficient method to calculate the torque of such a coupling is presented, based on analytical formulas for forces between magnets. It allows the exact evaluation of the performance of the studied couplings when the main dimensions of the coupling are varying with small calculation time. In this paper the influence of the number of pole pairs, the influence of the number of magnets per pole, the influence of the magnets' thickness, the influence of the air-gap radius, and the influence of the length of the structure are studied and discussed. Then some general rules are presented for efficient design of such a coupling.

Charpentier, J.F.; Lemarquand, G.

1999-09-01T23:59:59.000Z

69

The overview and history of permanent magnet devices in accelerator technology  

SciTech Connect (OSTI)

This paper reviews the early history of accelerator development with a particular focus on the important discoveries that opened the door for the application of permanent-magnet materials to this area of science. Researchers began to use permanent-magnet materials in particle accelerators soon after the invention of the alternating gradient principle, that showed magnetic fields could be used to control the transverse envelope of charged-particle beams. Since that time, permanent-magnet materials have found wide application in the modern charged particle accelerator. The history of permanent-magnet use in accelerator physics and technology is outlined, general design considerations are presented, and material properties of concern for particle accelerator applications are discussed.

Kraus, R.H. Jr.

1993-10-01T23:59:59.000Z

70

516 IEEE TRANSACTIONS ON MAGNETICS, VOL. 43, NO. 2, FEBRUARY 2007 Analysis of Permanent-Magnet Machines Using an  

E-Print Network [OSTI]

--Magnetic analysis, permanent-magnet machines. I. INTRODUCTION THE computation of magnetic fields in electric machines is typically performed using one of two methods; closed- form solutions [1]­[7] or finite-Magnet Machines Using an Anisotropic Magnetostatic Continuum Formulation Wensen Wang, Danhong Zhong, and Heath

Hofmann, Heath F.

71

Fabrication and Performance of Silicon-Embedded Permanent-Magnet Microgenerators  

E-Print Network [OSTI]

This paper focuses on the design, fabrication, and characterization of silicon-packaged permanent-magnet (PM) microgenerators. The use of silicon packaging favors fine control on shape and dimensions in batch fabrication ...

Herrault, Florian

72

Experimental verification for the design of a doubly-fed permanent magnetic generator  

E-Print Network [OSTI]

This is a continuous work on the project of a doubly-fed permanent magnet (DFPM) generator for wind turbines. The construction of a prototype machine was finally finished and experiments were conducted to verify the design ...

Lu, Bin, Ph. D. Massachusetts Institute of Technology

2007-01-01T23:59:59.000Z

73

Vibration sensors utilizing fiber fabry-perot interferometers and permanent magnets  

E-Print Network [OSTI]

A unique set of vibration sensors was designed that incorporate the fiber Fabry-Perot interferometer (FFPI) and permanent magnets. Feasibility of the design and its advantages over traditional sensors were verified by experiments. The new sensors...

Conkey, Andrew P.

2009-05-15T23:59:59.000Z

74

Structural optimisation of permanent magnet direct drive generators for 5MW wind turbines   

E-Print Network [OSTI]

This thesis focuses on permanent magnet "direct drive" electrical generators for wind turbines with large power output. A variety of such generator topologies is reviewed, tested and optimised in an attempt to increase ...

Zavvos, Aristeidis

2013-11-28T23:59:59.000Z

75

Estimation of Saturation of Permanent-Magnet Synchronous Motors Through an Energy-Based Model  

E-Print Network [OSTI]

We propose a parametric model of the saturated Permanent-Magnet Synchronous Motor (PMSM) together with an estimation method of the magnetic parameters. The model is based on an energy function which simply encompasses the saturation effects. Injection of fast-varying pulsating voltages and measurements of the resulting current ripples then permit to identify the magnetic parameters by linear least squares. Experimental results on a surface-mounted PMSM and an interoir magnet PMSM illustrate the relevance of the approach.

Jebai, AlKassem; Martin, Philippe; Rouchon, Pierre

2011-01-01T23:59:59.000Z

76

Abstract--Linear electrical loading system (LELS) driven by electrical cylinder with permanent magnet synchronous  

E-Print Network [OSTI]

magnet synchronous motor (PMSM) offers several advantages of high transmission efficiency and high cylinder driven by permanent magnet synchronous motor (PMSM). Though direct-drive linear motors has some to direct-drive linear motor, the solution of electrical cylinder with PMSM has larger output force

Yao, Bin

77

High speed internal permanent magnet machine and method of manufacturing the same  

DOE Patents [OSTI]

An internal permanent magnet (IPM) machine is provided. The IPM machine includes a stator assembly and a stator core. The stator core also includes multiple stator teeth. The stator assembly is further configured with stator windings to generate a magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface defining a cavity. The IPM machine also includes a rotor assembly and a rotor core. The rotor core is disposed inside the cavity and configured to rotate about the longitudinal axis. The rotor assembly further includes a shaft. The shaft further includes multiple protrusions alternately arranged relative to multiple bottom structures provided on the shaft. The rotor assembly also includes multiple stacks of laminations disposed on the protrusions and dovetailed circumferentially around the shaft. The rotor assembly further includes multiple permanent magnets for generating a magnetic field, which interacts with the stator magnetic field to produce torque. The permanent magnets are disposed between the stacks. The rotor assembly also includes multiple bottom wedges disposed on the bottom structures of the shaft and configured to hold the multiple stacks and the multiple permanent magnets.

Alexander, James Pellegrino (Ballston Lake, NY); EL-Refaie, Ayman Mohamed Fawzi (Niskayuna, NY); Lokhandwalla, Murtuza (Clifton Park, NY); Shah, Manoj Ramprasad (Latham, NY); VanDam, Jeremy Daniel (West Coxsackie, NY)

2011-09-13T23:59:59.000Z

78

Bulk SmCo5/a-Fe nanocomposite permanent magnets fabricated by mould-free Joule-heating compaction  

E-Print Network [OSTI]

Bulk SmCo5/a-Fe nanocomposite permanent magnets fabricated by mould-free Joule-heating compaction and soft magnetic phases.1­3 The prerequisite for effective exchange coupling is a small grain size, which are used to produce single-phase microcrystalline permanent magnets, are ineffective in producing

Liu, J. Ping

79

The use of a permanent magnet for water content measurements ofwood chips  

SciTech Connect (OSTI)

The Lawrence Berkeley National Laboratory has developed a device that measures the water content of wood chips, pulp and brown stock for the paper industry. This device employs a permanent magnet as the central part of a NMR measurement system. This report describes the magnet and the NMR measurement system. The results of water content measurements in wood chips in a magnetic field of 0.47 T are presented.

Barale, P.J.; Fong, C.G.; Green, M.A.; Luft, P.A.; McInturff,A.D.; Reimer, J.A.; Yahnke, M.

2001-09-20T23:59:59.000Z

80

Measurements of vacuum magnetic birefringence using permanent dipole magnets: the PVLAS experiment  

E-Print Network [OSTI]

The PVLAS collaboration is presently assembling a new apparatus (at the INFN section of Ferrara, Italy) to detect vacuum magnetic birefringence (VMB). VMB is related to the structure of the QED vacuum and is predicted by the Euler-Heisenberg-Weisskopf effective Lagrangian. It can be detected by measuring the ellipticity acquired by a linearly polarised light beam propagating through a strong magnetic field. Using the very same optical technique it is also possible to search for hypothetical low-mass particles interacting with two photons, such as axion-like (ALP) or millicharged particles (MCP). Here we report results of a scaled-down test setup and describe the new PVLAS apparatus. This latter one is in construction and is based on a high-sensitivity ellipsometer with a high-finesse Fabry-Perot cavity ($>4\\times 10^5$) and two 0.8 m long 2.5 T rotating permanent dipole magnets. Measurements with the test setup have improved by a factor 2 the previous upper bound on the parameter $A_e$, which determines the strength of the nonlinear terms in the QED Lagrangian: $A_e^{\\rm (PVLAS)} coupling constant of ALPs to two photons and confirmation of previous limits on the fractional charge of millicharged particles is given.

F. Della Valle; U. Gastaldi; G. Messineo; E. Milotti; R. Pengo; L. Piemontese; G. Ruoso; G. Zavattini

2013-01-21T23:59:59.000Z

Note: This page contains sample records for the topic "replace permanent magnets" 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

Processing and Protection of Rare Earth Permanent Magnet Particulate for Bonded Magnet Applications  

SciTech Connect (OSTI)

Rapid solidification of novel mixed rare earth-iron-boron, MRE{sub 2}Fe{sub 14}B (MRE = Nd, Y, Dy; currently), magnet alloys via high pressure gas atomization (HPGA) have produced similar properties and structures as closely related alloys produced by melt spinning (MS) at low wheel speeds. Recent additions of titanium carbide and zirconium to the permanent magnet (PM) alloy design in HPGA powder (using He atomization gas) have made it possible to achieve highly refined microstructures with magnetic properties approaching melt spun particulate at cooling rates of 10{sup 5}-10{sup 6}K/s. By producing HPGA powders with the desirable qualities of melt spun ribbon, the need for crushing ribbon was eliminated in bonded magnet fabrication. The spherical geometry of HPGA powders is more ideal for processing of bonded permanent magnets since higher loading fractions can be obtained during compression and injection molding. This increased volume loading of spherical PM powder can be predicted to yield a higher maximum energy product (BH){sub max} for bonded magnets in high performance applications. Passivation of RE-containing powder is warranted for the large-scale manufacturing of bonded magnets in applications with increased temperature and exposure to humidity. Irreversible magnetic losses due to oxidation and corrosion of particulates is a known drawback of RE-Fe-B based alloys during further processing, e.g. injection molding, as well as during use as a bonded magnet. To counteract these effects, a modified gas atomization chamber allowed for a novel approach to in situ passivation of solidified particle surfaces through injection of a reactive gas, nitrogen trifluoride (NF{sub 3}). The ability to control surface chemistry during atomization processing of fine spherical RE-Fe-B powders produced advantages over current processing methodologies. In particular, the capability to coat particles while 'in flight' may eliminate the need for post atomization treatment, otherwise a necessary step for oxidation and corrosion resistance. Stability of these thin films was attributed to the reduction of each RE's respective oxide during processing; recognizing that fluoride compounds exhibit a slightly higher (negative) free energy driving force for formation. Formation of RE-type fluorides on the surface was evidenced through x-ray photoelectron spectroscopy (XPS). Concurrent research with auger electron spectroscopy has been attempted to accurately quantify the depth of fluoride formation in order to grasp the extent of fluorination reactions with spherical and flake particulate. Gas fusion analysis on coated powders (dia. <45 {micro}m) from an optimized experiment indicated an as-atomized oxygen concentration of 343ppm, where typical, nonpassivated RE atomized alloys exhibit an average of 1800ppm oxygen. Thermogravimetric analysis (TGA) on the same powder revealed a decreased rate of oxidation at elevated temperatures up to 300 C, compared to similar uncoated powder.

Peter Kelly Sokolowski

2007-12-01T23:59:59.000Z

82

Method and apparatus for sensorless operation of brushless permanent magnet motors  

DOE Patents [OSTI]

A sensorless method and apparatus for providing commutation timing signals for a brushless permanent magnet motor extracts the third harmonic back-emf of a three-phase stator winding and independently cyclically integrates the positive and negative half-cycles thereof and compares the results to a reference level associated with a desired commutation angle. 23 figs.

Sriram, T.V.

1998-04-14T23:59:59.000Z

83

Control Realization for an Interior Permanent Magnet Synchronous Motor (IPMSM) in Automotive Drive Trains  

E-Print Network [OSTI]

Control Realization for an Interior Permanent Magnet Synchronous Motor (IPMSM) in Automotive Drive Trains Wilhelm Peters, Tobias Huber, Joachim Böcker Power Electronics and Electrical Drives, Paderborn automotive traction drives are a wide speed range, a wide constant-power operation range and high efficiency

Paderborn, Universität

84

A Fault-Tolerant Multiphase Permanent Magnet Generator for Marine Current Turbine Applications  

E-Print Network [OSTI]

A Fault-Tolerant Multiphase Permanent Magnet Generator for Marine Current Turbine Applications on offshore wind turbine systems. Marine current turbines are characterized by a very difficult access feature. This paper deals with the use of a PM multiphase marine current turbine generator. With this kind

Boyer, Edmond

85

Dynamic Motor Parameter Identification for High Speed Flux Weakening Operation of Brushless Permanent Magnet Synchronous Machines  

E-Print Network [OSTI]

performance torque control. Advanced high speed salient-pole synchronous machine drives use vector control Permanent Magnet Synchronous Machines Abstract: An experimental investigation is conducted to determine the behaviour of brushless PM synchronous machine parameters in the high speed flux weakening operating range

Szabados, Barna

86

Method and apparatus for sensorless operation of brushless permanent magnet motors  

DOE Patents [OSTI]

A sensorless method and apparatus for providing commutation timing signals for a brushless permanent magnet motor extracts the third harmonic back-emf of a three-phase stator winding and independently cyclically integrates the positive and negative half-cycles thereof and compares the results to a reference level associated with a desired commutation angle.

Sriram, Tillasthanam V. (Carmel, IN)

1998-01-01T23:59:59.000Z

87

Pulsating Torque Reduction for Permanent Magnet Bojan Grcar, Peter Cafuta, Gorazd Stumberger  

E-Print Network [OSTI]

vibration and acoustic noise which may be even amplified in variable speed drives when the torque frequencyPulsating Torque Reduction for Permanent Magnet AC Motors Bojan Grcar, Peter Cafuta, Gorazd motors are discussed in the paper. The pulsation torque is a consequence of the non-sinusoidal flux

Stankoviæ, Aleksandar

88

Design of optimal digital controller for stable super-high-speed permanent-magnet synchronous  

E-Print Network [OSTI]

collaborative design scheme of a super-high-speed permanent-magnet synchronous motor (PMSM) and its digital stability and performance. Since the systematic design of the PMSM can ensure its stability over the full the efficiency and performance of the PMSM. The unique feature in the proposed optimal V/f control is its design

Wu, Thomas

89

Multi-criteria based design approach of multiphase permanent magnet low speed synchronous machines  

E-Print Network [OSTI]

dedicated to multiphase Permanent Magnet Synchronous Machines (PMSM) supplied by Pulse Width Modulation to use PWM VSI for supplying high power propulsion machines [1]. The induction machines and the PMSM can be easily considered in this instance since the constraint on the reactive power does not apply [2]. PMSM

Paris-Sud XI, Université de

90

A Robust Hybrid Current Control for Permanent Magnet Synchronous Motor Drive  

E-Print Network [OSTI]

--Recently, the Permanent Magnet Synchronous Motor (PMSM) find a widespread utilization in modern adjustable AC drives. Comparisons using simulations on a 0.9-kW PMSM confirm that the proposed hybrid current controller gives of the stator current, obtained by using a fast Fourier transform, are used for comparison purposes. Index Terms--PMSM

Boyer, Edmond

91

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

E-Print Network [OSTI]

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...

Ozturk, Salih Baris

2009-05-15T23:59:59.000Z

92

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

E-Print Network [OSTI]

theory I. INTRODUCTION Permanent Magnet Stepper Motors (PMSM's) are widely used in industry for position control, especially in manu- facturing applications. PMSM's are more robust than brush DC motors the question of parameter identification without position or velocity sensors. The es- timation of PMSM

Paris-Sud XI, Université de

93

Power-Factor and Torque Calculation with Consideration of Cross Saturation of the Interior Permanent Magnet Synchronous Motor with  

E-Print Network [OSTI]

motor of a hybrid electric vehicle. I. INTRODUCTION The interior permanent magnet synchronous motor for application in a hybrid electric vehicle. The BFE structure enables the motor to control the magnitude Permanent Magnet Synchronous Motor with Brushless Field Excitation Seong Taek Lee1,2 , Timothy A. Burress1

Tolbert, Leon M.

94

296 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 57, NO. 1, JANUARY 2010 Very-High-Speed Slotless Permanent-Magnet  

E-Print Network [OSTI]

cell compressor [9]), machining industry (machine tool [10], micromachining), home appliance industry-High-Speed Slotless Permanent-Magnet Motors: Analytical Modeling, Optimization, Design, and Torque Measurement Methods-high-speed (VHS) slotless permanent-magnet motor design procedure using an analytical model. The model is used

Psaltis, Demetri

95

Design of a high power density, permanent magnet, axial gap dc motor  

SciTech Connect (OSTI)

In the design of drive motors for undersea vehicles, the premium placed on noise suppression suggests the use of a brush-commutated dc motor. The additional constraints of weight and volume, as well as unusual configuration, presents the axial air-gap configuration, with a permanent magnet field, as a viable candidate. In such a configuration the design of the brushes and commutator and the resulting structure becomes critical. The report describes a novel solution to this problem. The basic motor consists of two discs containing permanent magnets on either side of a magnetic structure containing the copper windings. An advantage of this motor concept is that copper cooling may easily be accomplished through the use of liquid circulating through the stator windings. The role of field and armature in a conventional disc motor configuration are reversed. The two discs containing the permanent magnets are rotating. The brushes are on the discs. The magnetic structure with the coils is stationary. The commutator bars are imbedded in the stationary member. Input power is supplied to the brushes through a brush-and-slip ring assembly. An electromagnetic design analysis for a 92 ft-lb, 700 rpm motor was performed. A finite element analysis has been conducted and the results show that magnetic saturation is not a limiting factor in this design. The motor torque is achievable within weight and volume constraints. 9 figs., 1 tab.

Hawsey, R.A.; Daniel, D.S.; Thomas, R.J. (Oak Ridge National Lab., TN (USA)); Bailey, J.M. (Tennessee Univ., Knoxville, TN (USA))

1990-01-01T23:59:59.000Z

96

Perfect 2-d quadrupole fields from permanent magnets  

SciTech Connect (OSTI)

Consider the 13-beam channel array shown in Figure 1. It is asserted that, under mathematically ideal assumptions, a pure quadrupole field is centered in each of the 13 beam channel boxes. An identical quadrupole field (for {bar H}, not {bar B}) is also centered in each of the 4 boxes containing 4 magnetic wedges located near the center of the system. An iron yoke ({mu} = {infinity}) with the displayed zig-zag shape provides a boundary condition (H{sub {parallel}} = 0) that makes the 13 channels equivalent to a portion of an infinite array. A similar array can be readily drawn for any number of beams. The quadrupole gradient in the beam channels is B{prime} = M{sub o}/2b, where M{sub o} is the remnant field of the magnetic wedges, and the channel diameter (wedge-to-wedge) is 2b. Note that a unit cell of the array, containing one beam, has diameter 2{radical}2 b (viewed from 45{degree} tilt) so its area is 8 b{sup 2}. A significant advantage of this design over those using dipolar blocks is the large fraction of cross section devoted to beam channels (50% vs 25%). Application to a heavy ion fusion driver is discussed.

Lee, E.P.; Vella, M. [Lawrence Berkeley National Lab., CA (United States). Accelerator and Fusion Research Div.

1996-04-01T23:59:59.000Z

97

Permanent Magnet Skew Quadrupoles for the Low Emittance LER Lattice of PEP-II  

SciTech Connect (OSTI)

The vertical emittance of the low energy ring (LER) in the PEP-II B-Factory was reduced by using skew quadrupoles consisting of permanent magnet material. The advantages over electric quadrupoles or rotating existing normal quadrupoles are discussed. To assure a high field quality, a Biot-Savart calculation was used to cancel the natural 12-pole component by using different size poles over a few layers. A magnetic measurement confirmed the high quality of the magnets. After installation and adjusting the original electric 12 skew and 16 normal quadrupoles the emittance contribution from the region close to the interaction point, which was the biggest part in the original design, was considerably reduced. To strengthen the vertical behavior of the LER beam, a low emittance lattice was developed. It lowered the original vertical design emittance from 0.54 nm-rad to 0.034 nm-rad. In order to achieve this, additional skew quadrupoles were required to bring the coupling correction out of the arcs and closer to the detector solenoid in the straight (Fig. 1). It is important, together with low vertical dispersion, that the low vertical emittance is not coupled into the horizontal, which is what we get if the coupling correction continues into the arcs. Further details of the lattice work is described in another paper; here we concentrate on the development of the permanent skew (PSK) quadrupole solution. Besides the permanent magnets there are two other possibilities, using electric magnets or rotating normal quadrupoles. Electric magnets would have required much more additional equipment like magnets stands, power supply, and new vacuum chamber sections. Rotating existing quadrupoles was also not feasible since they are mostly mounted together with a bending magnet on the same support girder.

Decker, F.-J.; Anderson, S.; Kharakh, D.; Sullivan, M.; /SLAC

2011-07-05T23:59:59.000Z

98

Axial gap permanent-magnet machine with reluctance poles and PM element covers  

SciTech Connect (OSTI)

An electric machine (10) has a disk-shaped rotor (24) disposed in an operating space between two opposing stator assemblies (11, 12) to provide two axial air gaps (15, 16). The rotor (24) has a hub (28) and an outer ring (26) of non-magnetic material and is further provided with a plurality of permanent magnetic elements (25) for coupling flux that is induced by the magnetic field of the stator assemblies (11, 12). The permanent magnetic elements (25) are spaced apart and reluctance poles (27) are positioned in spaces between the magnetic elements (25) to couple additional flux induced by the magnetic field of the stator assemblies (11, 12). Various constructions and shapes (40-45) for the PM magnetic elements (25) are disclosed, and including PM covers (60) of ferromagnetic material for enhancing q-axis flux in the air gaps (15, 16) and for reducing harmonics where toothed stators are used. Methods of providing increased torque using the the various rotor constructions are also disclosed.

Hsu, John S [Oak Ridge, TN; McKeever, John W [Oak Ridge, TN

2009-04-07T23:59:59.000Z

99

A nonlinearity in permanent-magnet systems used in watt balances  

E-Print Network [OSTI]

Watt balances are used to measure the Planck constant and will be used in the future to realize mass at the kilogram level. They increasingly rely on permanent magnet systems to generate the magnetic flux. It has been known that the weighing current might effect the magnetization state of the permanent magnetic system used in these systems causing a systematic bias that can lead to an error in the result if not accounted for. In this article a simple model explaining the effect of the weighing current on the yoke of the magnet is developed. This model leads to a nonlinear dependence of the magnetic flux density in the gap that is proportional to the squared value of the coil current. The effect arises from changing the reluctance of the yoke by the additional field produced by the coil. Our analysis shows that the effect depends on the width of the air gap, the magnetic flux density in the air gap, and the $BH$ curve of the yoke material. Suggestions to reduce the nonlinear effect are discussed.

Li, Shisong; Pratt, Jon

2014-01-01T23:59:59.000Z

100

arXiv:cond-mat/0007297v118Jul2000 Permanent magnetic moment in mesoscopic metals with spin-orbit interaction  

E-Print Network [OSTI]

arXiv:cond-mat/0007297v118Jul2000 Permanent magnetic moment in mesoscopic metals with spin-orbit interaction and odd number of electrons will have a permanent magnetic moment, even in zero magnetic field an effective single-electron Hamiltonian which accounts for spin-orbit coupling. I. INTRODUCTION Permanent

Serota, Rostislav

Note: This page contains sample records for the topic "replace permanent magnets" 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

Carbon-Based Magnets: Discovery & Design of Novel Permanent Magnets using Non-strategic Elements having Secure Supply Chains  

SciTech Connect (OSTI)

REACT Project: VCU is developing a new magnet for use in renewable power generators and EV motors that requires no rare earth minerals. Rare earths are difficult and expensive to process, but they make electric motors and generators smaller, lighter, and more efficient. VCU would replace the rare earth minerals in EV motor magnets with a low-cost and abundant carbon-based compound that resembles a fine black powder. This new magnet could demonstrate the same level of performance as the best commercial magnets available today at a significantly lower cost. The ultimate goal of this project is to demonstrate this new magnet in a prototype electric motor.

None

2012-01-01T23:59:59.000Z

102

Minimizing Wheel Slip in Railway Locomotives with Coupled Permanent Magnet Synchronous Motors  

E-Print Network [OSTI]

In this work I consider control strategies of permanent magnet synchronous motors in which the back-emf signal from the motor is used to achieve commutation of the six step driving circuit. I show that if the strategy is modified to connect multiple motors in a cyclic chain, then a collective synchronized state is favoured. The stability of this state can be exploited in the bogies of a railway locomotive to automatically terminate wheel slipping episodes.

Shayak Bhattacharjee

2015-01-17T23:59:59.000Z

103

A Permanent-Magnet Microwave Ion Source for a Compact High-Yield Neutron Generator  

SciTech Connect (OSTI)

We present recent work on the development of a microwave ion source that will be used in a high-yield compact neutron generator for active interrogation applications. The sealed tube generator will be capable of producing high neutron yields, 5x1011 n/s for D-T and ~;;1x1010 n/s for D-D reactions, while remaining transportable. We constructed a microwave ion source (2.45 GHz) with permanent magnets to provide the magnetic field strength of 87.5 mT necessary for satisfying the electron cyclotron resonance (ECR) condition. Microwave ion sources can produce high extracted beam currents at the low gas pressures required for sealed tube operation and at lower power levels than previously used RF-driven ion sources. A 100 mA deuterium/tritium beam will be extracted through a large slit (60x6 mm2) to spread the beam power over a larger target area. This paper describes the design of the permanent-magnet microwave ion source and discusses the impact of the magnetic field design on the source performance. The required equivalent proton beam current density of 40 mA/cm2 was extracted at a moderate microwave power of 400 W with an optimized magnetic field.

Waldmann, Ole; Ludewigt, Bernhard

2010-10-11T23:59:59.000Z

104

Iron-Nickel-Based SuperMagnets: Multiscale Development of L10 Materials for Rare Earth-Free Permanent Magnets  

SciTech Connect (OSTI)

REACT Project: Northeastern University will develop bulk quantities of rare-earth-free permanent magnets with an iron-nickel crystal structure for use in the electric motors of renewable power generators and EVs. These materials could offer magnetic properties that are equivalent to today’s best commercial magnets, but with a significant cost reduction and diminished environmental impact. This iron-nickel crystal structure, which is only found naturally in meteorites and developed over billions of years in space, will be artificially synthesized by the Northeastern University team. Its material structure will be replicated with the assistance of alloying elements introduced to help it achieve superior magnetic properties. The ultimate goal of this project is to demonstrate bulk magnetic properties that can be fabricated at the industrial scale.

None

2012-01-01T23:59:59.000Z

105

Optimal Control of Permanent-MagnetAC MachineDrives with a Novel Multiple ReferenceFrame Estimator/Regulator  

E-Print Network [OSTI]

, IN 47907-1285 Abstract- With appropriate current waveforms, permanent- magnet synchronous machine (PMSM are used to validate the work. I. INTRODUCTION PMSM drives have recently been a topic of intense research

Chapman, Patrick

106

Electro-mechanical energy conversion system having a permanent magnet machine with stator, resonant transfer link and energy converter controls  

DOE Patents [OSTI]

An electro-mechanical energy conversion system coupled between an energy source and an energy load comprising an energy converter device including a permanent magnet induction machine coupled between the energy source and the energy load to convert the energy from the energy source and to transfer the converted energy to the energy load and an energy transfer multiplexer to control the flow of power or energy through the permanent magnetic induction machine.

Skeist, S. Merrill; Baker, Richard H.

2006-01-10T23:59:59.000Z

107

Permanent-magnet helicon sources and arrays: A new type of rf plasma  

SciTech Connect (OSTI)

Helicon discharges are known for their ability to produce high densities of partially ionized plasma, their efficiency arising from an unusual mechanism of rf coupling. However, the requirement of a dc magnetic field has prevented their wide acceptance in industry. The use of permanent magnets greatly simplifies helicon sources, and arrays of small sources extend the use of helicons to the processing of large substrates. An eight-tube array was designed and constructed, and its density uniformity measured in a 53x165 cm{sup 2} chamber. Three innovations involved (a) the remote field of ring magnets, (b) a low-field density peak, and (c) rf power distribution. High-density plasmas uniform over large areas requires compatibility in all three areas.

Chen, Francis F.; Torreblanca, Humberto [University of California, Los Angeles, California 90095-1594 (United States)

2009-05-15T23:59:59.000Z

108

The influence of microstructure on magnetic properties of nanocrystalline Fe-Pt-Nb-B permanent magnet ribbons  

SciTech Connect (OSTI)

A FePt-based hard-magnetic nanocomposite of exchange spring type was prepared by isothermal annealing of melt-spun Fe{sub 52}Pt{sub 28}Nb{sub 2}B{sub 18} (atomic percent) ribbons. The relationship between microstructure and magnetic properties was investigated by qualitative and quantitative structural analysis based on the x-ray diffraction, transmission electron microscopy, and {sup 57}Fe Moessbauer spectrometry on one hand and the superconducting quantum interference device magnetometry on the other hand. The microstructure consists of L1{sub 0}-FePt hard-magnetic grains (15-45 nm in diameter) dispersed in a soft magnetic medium composed by A1 FePt, Fe{sub 2}B, and boron-rich (FeB)PtNb remainder phase. The ribbons annealed at 700 deg. C for 1 h exhibit promising hard-magnetic properties at room temperature: M{sub r}/M{sub s}=0.69; H{sub c}=820 kA/m and (BH){sub max}=70 kJ/m{sup 3}. Strong exchange coupling between hard and soft magnetic phases was demonstrated by a smooth demagnetizing curve and positive {delta}M-peak in the Henkel plot. The magnetic properties measured from 5 to 750 K reveals that the hard characteristics remains rather stable up to 550 K, indicating a good prospect for the use of these permanent magnets in a wide temperature range.

Randrianantoandro, N.; Greneche, J. M. [Laboratoire de Physique de l'Etat Condense, UMR CNRS 6087, Universite du Maine, 72085 Le Mans cedex 9 (France); Crisan, A. D. [Laboratoire de Physique de l'Etat Condense, UMR CNRS 6087, Universite du Maine, 72085 Le Mans cedex 9 (France); National Institute for Materials Physics, P.O. Box MG-7, 76900 Bucharest (Romania); Crisan, O. [National Institute for Materials Physics, P.O. Box MG-7, 76900 Bucharest (Romania); Marcin, J.; Kovac, J.; Hanko, J.; Skorvanek, I. [Institute of Experimental Physics, Slovak Academy of Sciences, 043 53 Kosice (Slovakia); Svec, P. [Institute of Physics, SAS, Dubravska cesta 9, 84228 Bratislava (Slovakia); Chrobak, A. [August Chelkowski Institute of Physics, University of Silesia, 40-007 Katowice (Poland)

2010-11-15T23:59:59.000Z

109

Research Interests: Application of nanotechnology to create novel permanent magnets (spring magnets)  

E-Print Network [OSTI]

; Superconductivity; Synchrotron-Radiation Instrumentation; Magnetism; (Neutron Scattering; Lattice Dynamics; Low

Kemner, Ken

110

Direct thrust measurement of a permanent magnet helicon double layer thruster  

SciTech Connect (OSTI)

Direct thrust measurements of a permanent magnet helicon double layer thruster have been made using a pendulum thrust balance and a high sensitivity laser displacement sensor. At the low pressures used (0.08 Pa) an ion beam is detected downstream of the thruster exit, and a maximum thrust force of about 3 mN is measured for argon with an rf input power of about 700 W. The measured thrust is proportional to the upstream plasma density and is in good agreement with the theoretical thrust based on the maximum upstream electron pressure.

Takahashi, K.; Lafleur, T.; Charles, C.; Alexander, P.; Boswell, R. W. [Space Plasma, Power and Propulsion Group, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia); Perren, M.; Laine, R. [ASTRIUM-EADS, 6 rue Laurent Pichat, 75016 Paris (France); Pottinger, S.; Lappas, V.; Harle, T.; Lamprou, D. [Surrey Space Centre, University of Surrey, Guildford GU2 7XH (United Kingdom)

2011-04-04T23:59:59.000Z

111

A Machine Approach for Field Weakening of Permanent-Magnet Motors  

SciTech Connect (OSTI)

The commonly known technology of field weakening for permanent-magnet (PM) motors is achieved by controlling the direct-axis current component through an inverter, without using mechanical variation of the air gap, a new machine approach for field weakening of PM machines by direct control of air-gap fluxes is introduced. The demagnetization situation due to field weakening is not an issue with this new method. In fact, the PMs are strengthened at field weakening. The field-weakening ratio can reach 1O:1 or higher. This technology is particularly useful for the PM generators and electric vehicle drives.

Hsu, J.S.

2000-04-02T23:59:59.000Z

112

High-Energy Permanent Magnets for Hybrid Vehicles and Alternative Energy Uses  

SciTech Connect (OSTI)

The report summarizes research undertaken by a multidisciplinary team aimed at the development of the next generation high-energy permanent magnets. The principal approach was relied on bottom-up fabrication of anisotropic nanocomposite magnets. Our efforts resulted in further development of the theoretical concept and fabrication principles for the nanocomposites and in synthesis of a range of rare-earth-based hard magnetic nanoparticles. Even though we did not make a breakthrough in the assembly of these hard magnetic particles with separately prepared Fe(Co) nanoparticles and did not obtain a compact nanocomposite magnet, our performed research will help to direct the future efforts, in particular, towards nano-assembly via coating, when the two phases which made the nanocomposite are first organized in core-shell-structured particles. Two other approaches were to synthesize (discover) new materials for the traditional singe-material magnets and the nanocomposite magnets. Integrated theoretical and experimental efforts lead to a significant advance in nanocluster synthesis technique and yielded novel rare-earth-free nanostructured and nanocomposite materials. Examination of fifteen R-Fe-X alloy systems (R = rare earth), which have not been explored earlier due to various synthesis difficulties reveal several new ferromagnetic compounds. The research has made major progress in bottom-up manufacturing of rare-earth-containing nanocomposite magnets with superior energy density and open new directions in development of higher-energy-density magnets that do not contain rare earths. The advance in the scientific knowledge and technology made in the course of the project has been reported in 50 peer-reviewed journal articles and numerous presentations at scientific meetings.

Hadjipanayis, George C. [University of Delaware] [University of Delaware; McCallum, William R. [Ames Laboratory] [Ames Laboratory; Sellmyer, David J. [University of Nebraska, Lincoln] [University of Nebraska, Lincoln; Harris, Vincent [Northeastern University] [Northeastern University; Carpenter, Everett E. [Virginia Commonwealth University] [Virginia Commonwealth University; Liu, Jinfang [Electron Energy Corporation] [Electron Energy Corporation

2013-12-17T23:59:59.000Z

113

Investigation of coercivity mechanism in hot deformed Nd-Fe-B permanent magnets by small-angle neutron scattering  

SciTech Connect (OSTI)

The magnetic reversal behaviors of single domain sized Nd-Fe-B permanent magnets, with and without isolation between the Nd{sub 2}Fe{sub 14}B grains, was clarified using small-angle neutron scattering (SANS). The SANS patterns obtained arose from changes in the magnetic domains and were analyzed using the Teubner–Stray model, a phenomenological correlation length model, to quantify the periodicity and morphology of the magnetic domains. The results indicated that the magnetic reversal evolved with the magnetic domains that had similar sized grains. The grain isolation enabled us to realize the reversals of single domains.

Yano, M., E-mail: masao-yano-aa@mail.toyota.co.jp; Manabe, A.; Shoji, T.; Kato, A. [Advanced Material Engineering Division, Toyota Motor Corporation, Susono 410-1193 (Japan); Ono, K. [High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801 (Japan); Harada, M. [Toyota Central R and D Labs, Inc., Aichi 480-1192 (Japan); Kohlbrecher, J. [Laboratory for Neutron Scattering, Paul Scherrer Institut, 5232 Villigen PSI (Switzerland)

2014-05-07T23:59:59.000Z

114

Design Procedure for a Very High Speed Slotless Permanent Magnet Motor Pierre-Daniel Pfister, Student Member, IEEE and Yves Perriard, Senior Member, IEEE  

E-Print Network [OSTI]

Design Procedure for a Very High Speed Slotless Permanent Magnet Motor Pierre-Daniel Pfister speed slotless permanent magnet motor design procedure using an analyti- cal model. The multiphysics in the center, a magnet, an air gap, and the stator yoke. In our case, the shaft radius is set to zero

Psaltis, Demetri

115

Abstract --This paper deals a double layer and a single layer Flux-Switching Permanent Magnet (FSPM) motors for a fault  

E-Print Network [OSTI]

Abstract --This paper deals a double layer and a single layer Flux-Switching Permanent Magnet (FSPM-Switching Permanent Magnet (FSPM) motors attract more and more attentions in the critical application as the Hybrid and will disturb the normal phases because of the magnetic coupling between phases. In order to compare the fault

Paris-Sud XI, Université de

116

Improving exchange-spring nanocomposite permanent magnets J. S. Jiang, J. E. Pearson, Z. Y. Liu, B. Kabius, S. Trasobares, D. J. Miller, and S. D. Bader  

E-Print Network [OSTI]

Improving exchange-spring nanocomposite permanent magnets J. S. Jiang, J. E. Pearson, Z. Y. Liu, B.1063/1.1828225] The "exchange-spring" mechanism in nanocomposite magnets,1 where the interfacial exchange coupling between to ul- trastrong permanent magnets whose energy product BH max is more than twice that of Nd­Fe­B.2

Liu, J. Ping

117

Manganese-Aluminum-Based Magnets: Nanocrystalline t-MnAI Permanent Magnets  

SciTech Connect (OSTI)

REACT Project: Dartmouth is developing specialized alloys with magnetic properties superior to the rare earths used in today’s best magnets. EVs and renewable power generators typically use rare earths to turn the axles in their electric motors due to the magnetic strength of these minerals. However, rare earths are difficult and expensive to refine. Dartmouth will swap rare earths for a manganese-aluminum alloy that could demonstrate better performance and cost significantly less. The ultimate goal of this project is to develop an easily scalable process that enables the widespread use of low-cost and abundant materials for the magnets used in EVs and renewable power generators.

None

2012-01-01T23:59:59.000Z

118

Status of UCLA Helical Permanent-Magnet Inverse Free Electron Laser  

SciTech Connect (OSTI)

A helical undulator, utilizing permanent-magnet of cylindrically symmetric (Halbach) geometry is being developed at UCLA's Neptune Facility. The initial prototype is a short 10 cm, 7 periods long helical undulator, designed to test the electron-photon coupling by observing the micro-bunching is currently being constructed. The Neptune IFEL facility utilizes a 15 MeV Photoinjector-generated electron beam of 0.5 nC interacting with CO{sub 2} of peak energy up to 100 J, estimated to have acceleration of 100 MeV/m. An Open Iris-Loaded Waveguide Structure (OILS) scheme which conserves laser mode size and wave fronts throughout the undulator, is utilized to avoid Gouy phase shift caused by focusing of the drive laser. Undulator design was tested by computer simulations Radia and Genesis 1.3. Coherent Transition Radiation and Coherent Cherenkov Radiation will be used for micro-bunching diagnostic. Currently permanent dipoles and their aluminum holders have been built, and the project is in its final state of assembly and undulator testing.

Knyazik, A.; Tikhoplav, R.; Frederico, J. T.; Affolter, M.; Rosenzweig, J. B. [Department of Physics and Astronomy, UCLA, Los Angeles, California 90095 (United States)

2009-01-22T23:59:59.000Z

119

Manganese-Based Magnets: Manganese-Based Permanent Magnet with 40 MGOe at 200°C  

SciTech Connect (OSTI)

REACT Project: PNNL is working to reduce the cost of wind turbines and EVs by developing a manganese-based nano-composite magnet that could serve as an inexpensive alternative to rare-earth-based magnets. The manganese composite, made from low-cost and abundant materials, could exceed the performance of today’s most powerful commercial magnets at temperature higher than 200°C. Members of PNNL’s research team will leverage comprehensive computer high-performance supercomputer modeling and materials testing to meet this objective. Manganese-based magnets could withstand higher temperatures than their rare earth predecessors and potentially reduce the need for any expensive, bulky engine cooling systems for the motor and generator. This would further contribute to cost savings for both EVs and wind turbines.

None

2012-01-01T23:59:59.000Z

120

Magnetic properties and scale-up of nanostructured cobalt carbide permanent magnetic powders  

SciTech Connect (OSTI)

Co{sub x}C magnetic nanoparticles were successfully synthesized via a modified polyol process without using a rare-earth catalyst during the synthesis process. The present results show admixtures of Co{sub 2}C and Co{sub 3}C phases possessing magnetization values exceeding 45?emu/g and coercivity values exceeding 2.3 kOe at room temperature. Moreover, these experiments have illuminated the important role of surfactants, reaction temperature, and reaction duration on the crystallographic structure and magnetic properties of Co{sub x}C, while tetraethylene glycol was employed as a reducing agent. The role of the ratios of Co{sub 2}C and Co{sub 3}C phases in the admixture magnetic properties is discussed. The crystallographic structure and particle size of the Co{sub x}C nanoparticles were characterized by X-ray diffractometry and scanning electron microscopy. Vibrating sample magnetometry was used to determine magnetic properties. Scale-up of synthesis to more than 5 g per batch was demonstrated with no significant degradation of magnetic properties.

Zamanpour, Mehdi, E-mail: zamanpour.m@husky.neu.edu; Bennett, Steven; Taheri, Parisa; Chen, Yajie [Center for Microwave Magnetic Materials and Integrated Circuits, Northeastern University, Boston, Massachusetts 02115 (United States); Harris, Vincent G. [Center for Microwave Magnetic Materials and Integrated Circuits, Northeastern University, Boston, Massachusetts 02115 (United States); Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115 (United States)

2014-05-07T23:59:59.000Z

Note: This page contains sample records for the topic "replace permanent magnets" 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

Development of a Direct Drive Permanent Magnet Generator for Small Wind Turbines  

SciTech Connect (OSTI)

In this program, TIAX performed the conceptual design and analysis of an innovative, modular, direct-drive permanent magnet generator (PMG) for use in small wind turbines that range in power rating from 25 kW to 100 kW. TIAX adapted an approach that has been successfully demonstrated in high volume consumer products such as direct-drive washing machines and portable generators. An electromagnetic model was created and the modular PMG design was compared to an illustrative non-modular design. The resulting projections show that the modular design can achieve significant reductions in size, weight, and manufacturing cost without compromising efficiency. Reducing generator size and weight can also lower the size and weight of other wind turbine components and hence their manufacturing cost.

Chertok, Allan; Hablanian, David; McTaggart, Paul; DOE Project Officer - Keith Bennett

2004-11-16T23:59:59.000Z

122

Indirect rotor position sensing in real time for brushless permanent magnet motor drives  

SciTech Connect (OSTI)

This paper describes a modern solution to real-time rotor position estimation of brushless permanent magnet (PM) motor drives. The position estimation scheme, based on flux linkage and line-current estimation, is implemented in real time by using the abc reference frame, and it is tested dynamically. The position estimation model of the test motor, development of hardware, and basic operation of the digital signal processor (DSP) are discussed. The overall position estimation strategy is accomplished with a fast DSP (TMS320C30). The method is a shaft position sensorless method that is applicable to a wide range of excitation types in brushless PM motors without any restriction on the motor model and the current excitation. Both rectangular and sinewave-excited brushless PM motor drives are examined, and the results are given to demonstrate the effectiveness of the method with dynamic loads in closed estimated position loop.

Ertugrul, N. [Univ. of Adelaide (Australia). Dept. of Electrical and Electronic Engineering] [Univ. of Adelaide (Australia). Dept. of Electrical and Electronic Engineering; Acarnley, P.P. [Univ. of Newcastle upon Tyne (United Kingdom). Dept. of Electrical and Electronic Engineering] [Univ. of Newcastle upon Tyne (United Kingdom). Dept. of Electrical and Electronic Engineering

1998-07-01T23:59:59.000Z

123

Carbide/nitride grain refined rare earth-iron-boron permanent magnet and method of making  

DOE Patents [OSTI]

A method of making a permanent magnet wherein 1) a melt is formed having a base alloy composition comprising RE, Fe and/or Co, and B (where RE is one or more rare earth elements) and 2) TR (where TR is a transition metal selected from at least one of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, and Al) and at least one of C and N are provided in the base alloy composition melt in substantially stoichiometric amounts to form a thermodynamically stable compound (e.g. TR carbide, nitride or carbonitride). The melt is rapidly solidified in a manner to form particulates having a substantially amorphous (metallic glass) structure and a dispersion of primary TRC, TRN and/or TRC/N precipitates. The amorphous particulates are heated above the crystallization temperature of the base alloy composition to nucleate and grow a hard magnetic phase to an optimum grain size and to form secondary TRC, TRN and/or TRC/N precipitates dispersed at grain boundaries. The crystallized particulates are consolidated at an elevated temperature to form a shape. During elevated temperature consolidation, the primary and secondary precipitates act to pin the grain boundaries and minimize deleterious grain growth that is harmful to magnetic properties.

McCallum, R. William (Ames, IA); Branagan, Daniel J. (Ames, IA)

1996-01-23T23:59:59.000Z

124

Carbide/nitride grain refined rare earth-iron-boron permanent magnet and method of making  

DOE Patents [OSTI]

A method of making a permanent magnet is disclosed wherein (1) a melt is formed having a base alloy composition comprising RE, Fe and/or Co, and B (where RE is one or more rare earth elements) and (2) TR (where TR is a transition metal selected from at least one of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, and Al) and at least one of C and N are provided in the base alloy composition melt in substantially stoichiometric amounts to form a thermodynamically stable compound (e.g. TR carbide, nitride or carbonitride). The melt is rapidly solidified in a manner to form particulates having a substantially amorphous (metallic glass) structure and a dispersion of primary TRC, TRN and/or TRC/N precipitates. The amorphous particulates are heated above the crystallization temperature of the base alloy composition to nucleate and grow a hard magnetic phase to an optimum grain size and to form secondary TRC, TRN and/or TRC/N precipitates dispersed at grain boundaries. The crystallized particulates are consolidated at an elevated temperature to form a shape. During elevated temperature consolidation, the primary and secondary precipitates act to pin the grain boundaries and minimize deleterious grain growth that is harmful to magnetic properties. 33 figs.

McCallum, R.W.; Branagan, D.J.

1996-01-23T23:59:59.000Z

125

Development of a Permanent-Magnet Microwave Ion Source for a Sealed-Tube Neutron Generator  

SciTech Connect (OSTI)

A microwave ion source has been designed and constructed for use with a sealed-tube, high-yield neutron generator. When operated with a tritium-deuterium gas mixture the generator will be capable of producing 5*1011 n/s in non-proliferation applications. Microwave ion sources are well suited for such a device because they can produce high extracted beam currents with a high atomic fraction at low gas pressures of 0.2-0.3 Pa required for sealed tube operation. The magnetic field strength for achieving electron cyclotron resonance (ECR) condition, 87.5 mT at 2.45 GHz microwave frequency, was generated and shaped with permanent magnets surrounding the plasma chamber and a ferromagnetic plasma electrode. This approach resulted in a compact ion source that matches the neutron generator requirements. The needed proton-equivalent extracted beam current density of 40 mA/cm^2 was obtained at moderate microwave power levels of 400 W. Results on magnetic field design, pressure dependency and atomic fraction measured for different wall materials are presented.

Waldmann, Ole; Ludewigt, Bernhard

2011-03-31T23:59:59.000Z

126

Abstract--In this paper, the performances of a hybrid ex-citation flux switching permanent magnets synchronous  

E-Print Network [OSTI]

High efficiency, high power factor, high Tor- que/Volume ratio, high torque and speed operating points solution [3] while it combines the advantages of the permanent magnets machines and wound rotor synchronous iron parts, classical armature wind- ings and additional DC excitation coils situated above

Paris-Sud XI, Université de

127

Abstract--A variable speed wind turbine is presented in this paper, where multiple permanent magnet synchronous  

E-Print Network [OSTI]

1 Abstract--A variable speed wind turbine is presented in this paper, where multiple permanent magnet synchronous generators (MPMSGs) drive-train configuration is employed in the wind turbine of this variable speed wind turbine based on multiple generators drive-train configuration. Index Terms--Wind power

Chen, Zhe

128

Design of low-power permanent-magnet synchronous motor for use in high-density heat pump  

E-Print Network [OSTI]

An analytical model for the functionality of a permanent-magnet synchronous motor is developed. Taking as input a specific geometry, it predicts steady-state losses of a design at an average rate of 0.85 seconds per analysis, ...

Jenicek, David P. (David Pierre)

2011-01-01T23:59:59.000Z

129

IEEE TRANSACTIONS ON MAGNETICS, VOL. 41, NO. 10, OCTOBER 2005 3823 Design of a Superhigh-Speed Cryogenic Permanent  

E-Print Network [OSTI]

and simulation of a superhigh-speed permanent magnet synchronous motor (PMSM) that operates in the cryogenic temperature of 77 K. The designed PMSM is used to drive a two-stage cryocooler for zero boil-off and long, and some tradeoffs used in the design. A prototype PMSM was built to verify the design methodology. Index

Wu, Thomas

130

Abstract-During the design of permanent magnet synchronous machines (PMSM), the first step that engineers have to do,  

E-Print Network [OSTI]

Abstract-During the design of permanent magnet synchronous machines (PMSM), the first step. Fractional- slots (FS)-PMSM offers several advantages and have been focused by a lot of researches. However to their numerous advantages, PMSM have found wide attention in the research and industrial areas. For instance

Paris-Sud XI, Université de

131

Performance of a permanent-magnet helicon source at 27 and 13 MHz  

SciTech Connect (OSTI)

A small helicon source is used to create dense plasma and inject it into a large chamber. A permanent magnet is used for the dc magnetic field (B-field), making the system very simple and compact. Though theory predicts that better antenna coupling will occur at 27.12 MHz, it was found that 13.56 MHz surprisingly gives even higher density due to practical effects not included in theory. Complete density n and electron temperature T{sub e} profiles are measured at three distances below the source. The plasma inside the source is also measured with a special probe, even under the antenna. The density there is lower than expected because the plasma created is immediately ejected, filling the experimental chamber. The advantage of helicons over inductively coupled plasmas (with no B-field) increases with RF power. At high B-fields, edge ionization by the Trivelpiece-Gould mode can be seen. These results are useful for design of multiple-tube, large-area helicon sources for plasma etching and deposition because problems are encountered which cannot be foreseen by theory alone.

Chen, Francis F. [Electrical Engineering Department, University of California, Los Angeles, California 90095 (United States)

2012-09-15T23:59:59.000Z

132

16,000-rpm Interior Permanent Magnet Reluctance Machine with Brushless Field Excitation  

SciTech Connect (OSTI)

The reluctance interior permanent magnet (RIPM) motor is currently used by many leading auto manufacturers for hybrid vehicles. The power density for this type of motor is high compared with that of induction motors and switched reluctance motors. The primary drawback of the RIPM motor is the permanent magnet (PM) because during high-speed operation, the fixed PM produces a huge back electromotive force (emf) that must be reduced before the current will pass through the stator windings. This reduction in back-emf is accomplished with a significant direct-axis (d-axis) demagnetization current, which opposes the PM's flux to reduce the flux seen by the stator wires. This may lower the power factor and efficiency of the motor and raise the requirement on the alternate current (ac) power supply; consequently, bigger inverter switching components, thicker motor winding conductors, and heavier cables are required. The direct current (dc) link capacitor is also affected when it must accommodate heavier harmonic currents. It is commonly agreed that, for synchronous machines, the power factor can be optimized by varying the field excitation to minimize the current. The field produced by the PM is fixed and cannot be adjusted. What can be adjusted is reactive current to the d-axis of the stator winding, which consumes reactive power but does not always help to improve the power factor. The objective of this project is to avoid the primary drawbacks of the RIPM motor by introducing brushless field excitation (BFE). This offers both high torque per ampere (A) per core length at low speed by using flux, which is enhanced by increasing current to a fixed excitation coil, and flux, which is weakened at high speed by reducing current to the excitation coil. If field weakening is used, the dc/dc boost converter used in a conventional RIPM motor may be eliminated to reduce system costs. However, BFE supports a drive system with a dc/dc boost converter, because it can further extend the constant power speed range of the drive system and adjust the field for power factor and efficiency gains. Lower core losses at low torque regions, especially at high speeds, are attained by reducing the field excitation. Safety and reliability are increased by weakening the field when a winding short-circuit fault occurs, preventing damage to the motor. For a high-speed motor operating at 16,000-revolutions per minute (rpm), mechanical stress is a challenge. Bridges that link the rotor punching segments together must be thickened for mechanical integrity; consequently, increased rotor flux leakage significantly lowers motor performance. This barrier can be overcome by BFE to ensure sufficient rotor flux when needed.

Hsu, J.S.; Burress, T.A.; Lee, S.T.; Wiles, R.H.; Coomer, C.L.; McKeever, J.W.; Adams, D.J.

2007-10-31T23:59:59.000Z

133

Control of Two Permanent Magnet Machines Using a Five-Leg Inverter for Automotive Applications  

SciTech Connect (OSTI)

This paper presents digital control schemes for control of two permanent magnet (PM) machines in an integrated traction and air-conditioning compressor drive system for automotive applications. The integrated drive system employs a five-leg inverter to power a three-phase traction PM motor and a two-phase compressor PM motor by tying the common terminal of the two-phase motor to the neutral point of the three-phase motor. Compared to a three-phase or a standalone two-phase inverter, it eliminates one phase leg and shares the control electronics between the two drives, thus significantly reducing the component count of the compressor drive. To demonstrate that the speed and torque of the two PM motors can be controlled independently, a control strategy was implemented in a digital signal processor, which includes a rotor flux field orientation based control (RFOC) for the three-phase motor, a similar RFOC and a position sensorless control in the brushless dc (BLDC) mode for the two-phase motor. Control implementation issues unique to a two-phase PM motor are also discussed. Test results with the three-phase motor running in the ac synchronous (ACS) mode while the two-phase motor either in the ACS or the BLDC mode are included to verify the independent speed and torque control capability of the integrated drive.

Su, Gui-Jia [ORNL; Tang, Lixin [ORNL; Huang, Xianghui [GE Global Research

2006-01-01T23:59:59.000Z

134

Plasma studies of the permanent magnet electron cyclotron resonance ion source at Peking University  

SciTech Connect (OSTI)

At Peking University (PKU) we have developed several 2.45 GHz Permanent Magnet Electron Cyclotron Resonance ion sources for PKUNIFTY, SFRFQ, Coupled RFQ and SFRFQ, and Dielectric-Wall Accelerator (DWA) projects (respectively, 50 mA of D{sup +}, 10 mA of O{sup +}, 10 mA of He{sup +}, and 50 mA of H{sup +}). In order to improve performance of these ion sources, it is necessary to better understand the principal factors that influence the plasma density and the atomic ion fraction. Theoretical analysis about microwave transmission and cut-off inside the discharge chamber were carried out to study the influence of the discharge chamber diameters. As a consequence, experimental studies on plasma density and ion fraction with different discharge chamber sizes have been carried out. Due to the difficulties in measuring plasma density inside the discharge chamber, the output beam current was measured to reflect the plasma density. Experimental results show that the plasma density increases to the maximum and then decreases significantly as the diameter changed from 64 mm to 30 mm, and the atomic ion fraction has the same tendency. The maximum beam intensity was obtained with the diameter of 35 mm, but the maximum atomic ion fraction with a diameter of 40 mm. The experimental results are basically accordant with the theoretical calculation. Details are presented in this paper.

Ren, H. T.; Peng, S. X., E-mail: sxpeng@pku.edu.cn; Xu, Y.; Zhao, J.; Lu, P. N.; Chen, J.; Zhang, A. L.; Zhang, T.; Guo, Z. Y.; Chen, J. E. [State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, Peking University, Beijing 100871 (China)] [State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, Peking University, Beijing 100871 (China)

2014-02-15T23:59:59.000Z

135

Ferrite permanent magnet electrical machine and the application thereof within vehicle traction drives  

SciTech Connect (OSTI)

This patent describes, in combination, a land vehicle having axially aligned ground engaging tractive wheels, and a drivetrain carried by the vehicle for the propulsion thereof. The drivetrain comprises: (a) a substantially fixed DC power source including at least one chemical battery, (b) transmission means including selectable multiple gear ratios, an input shaft and a mechanical differential operative to transfer torque to the wheels, (c) a single-phase self-synchronous permanent magnet motor including, (i) an elongated central shaft, (ii) a generally u-shaped frame assembly adapted for mechanical grounding the shaft to a relatively stationary portion of the vehicle, the shaft being secured to the frame proximate each end thereof, (iii) a stator assembly secured to the shaft and characterized by a plurality of outwardly directed integrally formed salient poles and associated bifilar-wound induction coils, and (iv) a rotor assembly rotatably disposed on the shaft and substantially enclosing the stator assembly, the rotor assembly comprising a cylindrical shell defining an inner surface.

Gritter, D.J.; O'Neil, W.K.; Turner, D.

1987-03-17T23:59:59.000Z

136

H-mode accelerating structures with permanent-magnet quadrupole beam focusing  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

We have developed high-efficiency normal-conducting rf accelerating structures by combining H -mode resonator cavities and a transverse beam focusing by permanent-magnet quadrupoles (PMQ), for beam velocities in the range of a few percent of the speed of light. The shunt impedance of interdigital H -mode (IH-PMQ) structures is 10–20 times higher than that of a conventional drift-tube linac, while the transverse size is 4–5 times smaller. Results of the combined 3D modeling—electromagnetic computations, multiparticle beam-dynamics simulations with high currents, and thermal-stress analysis—for an IH-PMQ accelerator tank are presented. The accelerating-field profile in the tank is tuned to provide the best propagation of a 50-mA deuteron beam using coupled iterations of electromagnetic and beam-dynamics modeling. Measurements of a cold model of the IH-PMQ tank show a good agreement with the calculations. Examples of cross-bar H -mode structures with PMQ focusing for higher beam velocities are also presented. H -PMQ accelerating structures following a short radio-frequency quadrupole accelerator can be used both in the front end of ion linacs or in stand-alone applications.

Kurennoy, S. S.; Rybarcyk, L. J.; O’Hara, J. F.; Olivas, E. R.; Wangler, T. P.

2012-09-01T23:59:59.000Z

137

2528 IEEE TRANSACTIONS ON MAGNETICS, VOL. 43, NO. 6, JUNE 2007 A Highly Efficient 200 000 RPM Permanent Magnet Motor System  

E-Print Network [OSTI]

presents the development of an ultra-high-speed permanent magnet synchronous motor (PMSM) that produces large iron loss at high-speed. In ultra-high-speed applications, PMSM offers the advantage of high efficiency, and high stability, is generally considered for high performance PMSM control. However, for ultra

Wu, Thomas

138

Radial-Gap Permanent Magnet Motor and Drive Research FY 2004  

SciTech Connect (OSTI)

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

139

2452 IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 39, NO. 11, NOVEMBER 2011 Permanent-Magnet Helicon Discharge Array  

E-Print Network [OSTI]

entail large and heavy electromagnets and their dc power supplies. Annular permanent magnets can produce, which consists of an array of eight tubes driven in parallel by a 3.2-kW RF supply at 13.56 MHz. Between water. The three-turn m = 0 antennas are of 1/8-in-diameter (3.2-mm-diameter) cop- per tubing

Chen, Francis F.

140

A Novel Current Angle Control Scheme in a Current Source Inverter Fed Permanent Magnet Synchronous Motor Drive for Automotive Applications  

SciTech Connect (OSTI)

This paper describes a novel speed control scheme to operate a current source inverter (CSI) driven surface-mounted permanent magnet synchronous machine (SPMSM) for hybrid electric vehicles (HEVs) applications. The idea is to use the angle of the current vector to regulate the rotor speed while keeping the two dc-dc converter power switches on all the time to boost system efficiency. The effectiveness of the proposed scheme was verified with a 3 kW CSI-SPMSM drive prototype.

Tang, Lixin [ORNL] [ORNL; Su, Gui-Jia [ORNL] [ORNL

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "replace permanent magnets" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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to obtain the most current and comprehensive results.


141

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

SciTech Connect (OSTI)

It is well known that the ability of the permanent magnet synchronous machine (PMSM) to operate over a wide constant power speed range (CPSR) is dependent upon the machine inductance [1,2,3,4,5]. Early approaches for extending CPSR operation included adding supplementary inductance in series with the motor [1] and the use of anti-parallel thyristor pairs in series with the motor-phase windings [5]. The increased inductance method is compatible with a voltage-source inverter (VSI) controlled by pulse-width modulation (PWM) which is called the conventional phase advance (CPA) method. The thyristor method has been called the dual mode inverter control (DMIC). Neither of these techniques has met with wide acceptance since they both add cost to the drive system and have not been shown to have an attractive cost/benefit ratio. Recently a method has been developed to use fractional-slot concentrated windings to significantly increase the machine inductance [6]. This latest approach has the potential to make the PMSM compatible with CPA without supplemental external inductance. If the performance of such drive is acceptable, then the method may make the PMSM an attractive option for traction applications requiring a wide CPSR. A 30 pole, 6 kW, 6000 maximum revolutions per minute (rpm) prototype of the fractional-slot PMSM design has been developed [7]. This machine has significantly more inductance than is typical of regular PMSMs. The prototype is to be delivered in late 2005 to the Oak Ridge National Laboratory (ORNL) for testing and development of a suitable controller. In advance of the test/control development effort, ORNL has used the PMSM models developed over a number of previous studies to study the steady-state performance of high-inductance PMSM machines with a view towards control issues. The detailed steady-state model developed includes all motor and inverter-loss mechanisms and will be useful in assessing the performance of the dynamic controller to be developed in future work. This report documents the results of this preliminary investigation.

Lawler, J.S.

2005-12-21T23:59:59.000Z

142

Cancellation of TorqueRipple Due to Nonidealitiesof PermanentMagnet SynchronousMachine Drives  

E-Print Network [OSTI]

-magnet synchronous application than the predecessors. Further, the technique is machine (PMSM) drives dictates

Chapman, Patrick

143

Spectra of In-like Tungsten, $W^{25+}$, from the Shanghai permanent magnet electron beam ion trap  

E-Print Network [OSTI]

Three visible lines of M1 transitions from In-like W were recorded using the Shanghai permanent magnet electron beam ion trap. The experimental wavelengths were measured as 493.84 $\\pm$ 0.15, 226.97 $\\pm$ 0.13 and 587.63 $\\pm$ 0.23 nm (vacuum wavelengths). These results are in good agreement with theoretical predictions obtained using large-scale Relativistic Many-Body Perturbation Theory, in the form of the Flexible Atomic Code, and some explorations with the Muliconfiguration Dirac-Hartree-Fock code GRASP2K.

Li, W; Shi, Z; Fei, Z; R,; Zhao,; Brage, T; Huldt, S; Hutton, R; Zou, Y

2015-01-01T23:59:59.000Z

144

Results from a prototype permanent magnet dipole-quadrupole hybrid for the PEP-II B-factory  

SciTech Connect (OSTI)

We describe the construction of a prototype hybrid permanent magnet dipole and quadrupole. The magnet consists of two concentric rings of Sm{sub 2}Co{sub 17} magnetic material 5 cm in length. The outer ring is made of 16 uniformly magnetized blocks assembled as a Halbach dipole and the inner ring has 32 blocks oriented in a similar fashion so as to generate a quadrupole field. The resultant superimposed field is an offset quadrupole field which allows us to center the field on the high-energy beam in the interaction region of the PEP-II B-factory. The dipole blocks are glued to the inside surface of an outer support collar and the quadrupole blocks are held in a fixture that allows radial adjustment of the blocks prior to potting the entire assembly with epoxy. An extensive computer model of the magnet has been made and from this model we developed a tuning algorithm that allowed us to greatly reduce the n=3 17 harmonics of the magnet.

Sullivan, M.; Bowden, G.; Ecklund, S. [and others

1997-06-01T23:59:59.000Z

145

Advances in nanostructured permanent magnets research This article has been downloaded from IOPscience. Please scroll down to see the full text article.  

E-Print Network [OSTI]

motors and wind turbine generators using permanent magnets are more energy efficient compared with other/12/2012 at 05:16 Please note that terms and conditions apply. View the table of contents for this issue, or go conditions on interphase exchange interactions are given. Synthesis techniques for hard magnetic

Liu, J. Ping

146

arXiv:1103.2923v1[math.OC]15Mar2011 Estimation of Saturation of Permanent-Magnet  

E-Print Network [OSTI]

a parametric model of the saturated Permanent-Magnet Synchronous Motor (PMSM) together with an estimation on a surface-mounted PMSM and an interoir magnet PMSM illustrate the relevance of the approach. Index Terms (PMSM) at low velocity remains a challenging task. Most of the existing control algorithms rely

Paris-Sud XI, Université de

147

Study of the Advantages of Internal Permanent Magnet Drive Motor with Selectable Windings for Hybrid-Electric Vehicles  

SciTech Connect (OSTI)

This report describes research performed on the viability of changing the effectively active number of turns in the stator windings of an internal permanent magnet (IPM) electric motor to strengthen or weaken the magnetic fields in order to optimize the motor's performance at specific operating speeds and loads. Analytical and simulation studies have been complemented with research on switching mechanisms to accomplish the task. The simulation studies conducted examine the power and energy demands on a vehicle following a series of standard driving cycles and the impact on the efficiency and battery size of an electrically propelled vehicle when it uses an IPM motor with turn-switching capabilities. Both full driving cycle electric propulsion and propulsion limited starting from zero to a set speed have been investigated.

Otaduy, P.J.; Hsu, J.S.; Adams, D.J.

2007-11-30T23:59:59.000Z

148

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 55, NO. 2, FEBRUARY 2008 501 Permanent Magnet Synchronous Machine  

E-Print Network [OSTI]

Terms--Direct control, hybrid dynamic systems, perma- nent magnet synchronous machine (PMSM), physical magnet synchronous machine (PMSM) and a two-level voltage inverter (Fig. 1). The PMSM constitutes variables) so hybrid control strategies apply adequately. For PMSM drives, vector control has been

Paris-Sud XI, Université de

149

Elephant butte powerplant investigation of permanent magnet generator corrosion and bearing failures. Project notes 8450-97-07. Technical memo  

SciTech Connect (OSTI)

This investigation and report were initiated in response to a request to determine causes for excessive corrosion and premature bearing failures on the Woodward Permanent Magnet Generator (PMG) on the three main generating units at Elephant Butte. All three main generating units were rewound using epoxy-type insulating materials between 1989 and 1991. Plant personnel reported that corrosion and failure rates seemed to accelerate after the new stator windings were installed. This report documents field testing conducted the week of March 10, 1997, to determine if stray electrical currents/voltages were causing the problems. Electrical field test results indicate that accelerated PMG bearing failure and corrosion were not caused by stray voltages or current. Tests were conducted on the main shaft in the turbine pit and on the PMG shaft and housing located atop the exciter shaft.

Price, P.; Atwater, P.

1997-04-01T23:59:59.000Z

150

On-the-fly machine-learning for high-throughput experiments: search for rare-earth-free permanent magnets  

SciTech Connect (OSTI)

Advanced materials characterization techniques with ever-growing data acquisition speed and storage capabilities represent a challenge in modern materials science, and new procedures to quickly assess and analyze the data are needed. Machine learning approaches are effective in reducing the complexity of data and rapidly homing in on the underlying trend in multi-dimensional data. Here, we show that by employing an algorithm called the mean shift theory to a large amount of diffraction data in high-throughput experimentation, one can streamline the process of delineating the structural evolution across compositional variations mapped on combinatorial libraries with minimal computational cost. Data collected at a synchrotron beamline are analyzed on the fly, and by integrating experimental data with the inorganic crystal structure database (ICSD), we can substantially enhance the accuracy in classifying the structural phases across ternary phase spaces. We have used this approach to identify a novel magnetic phase with enhanced magnetic anisotropy which is a candidate for rare-earth free permanent magnet.

Kusne, Aaron Gilad [University of Maryland; Gao, Tieren [University of Maryland; Mehta, Apurva [SLAC National Accelerator Laboratory; Ke, Liqin [Ames Laboratory; Nguyen, Manh Cuong [Ames Laboratory; Ho, Kai-Ming [Ames Laboratory; Antropov, Vladimir [Ames Laboratory; Wang, Cai-Zhuang [Ames Laboratory; Kramer, Matthew J [Ames Laboratory; Long, Christian [University of Maryland; Takeuchi, Ichiro [University of Maryland

2014-09-15T23:59:59.000Z

151

Dynamic Jiles-Atherton Model for Determining the Magnetic Power Loss at High Frequency in Permanent Magnet Machines  

E-Print Network [OSTI]

BH curves at frequencies up to several kilohertz. B. Application of the Dynamic Jiles-Atherton Model to the Magnetic Loss of a PMSM (BLDC motor) According to Guo’s review paper, empirical formulae have been derived to model the magnetic properties... of the conventional time stepped FEM [11], [26], [27] to utilize the proposed dynamic Jiles-Atherton model to estimate the magnetic power loss in a PMSM. More mathematical work needs to be done to make the dynamic Jiles-Atherton model and time stepped FEM...

Du, Ruoyang; Student Member; IEEE; Robertson, Paul

2014-12-18T23:59:59.000Z

152

IEEE Transactions on Energy Conversion, Vol. 14, No. 4, December 1999 1043 OptimalCurrent Control Strategies for Surface-MountedPermanent-Magnet  

E-Print Network [OSTI]

. There has been considerable work in the area of choosing optimal current excitation of PMSM drives minimizing the rms stator Permanent-magnet synchronous machine (PMSM) drives current was set forth in [6 that In designing PMSM drives, two factors Of interest are would he difficult to implement in a real-time control

Chapman, Patrick

153

Compaction and sintering behaviors of a Nd-Fe-B permanent magnet alloy  

SciTech Connect (OSTI)

Extensive x-ray diffraction (XRD) and magnetic measurements were done on Nd/sub 15/ Fe/sub 77/ B/sub 8/ magnet alloy green compacts after cold isostatic pressing following a pulsed 2-T field (CIP) and die-pressing under a static 1.2-T perpendicular field (DP1) or parallel field (DP2), and on those after sintering. An alignment factor F, through the calculation of the integrated diffraction intensity ratio of the XRD patterns, was adopted as the effectiveness of magnetic alignment. At the green compact state, DP1 has the best alignment while CIP the worst. However, after sintering the alignment factor was such that CIP>DPI>DP2, the same order as the magnetic properties. Three mechanisms were proposed for the evolution of the alignment factor at different stages of sintering, i.e., that both the appearance of a liquid phase at low temperatures and preferred grain growth at high temperatures enhance F, while recrystallization at intermediate temperatures deteriorates F. CIP results in less-defect green compact, hence less recrystallization, leading to better resultant alignment

Chin, T.; Hung, M.; Tsai, D.; Wu, K.; Chang, W.

1988-11-15T23:59:59.000Z

154

Modeling and analysis of a semi-active permanent magnet damper  

E-Print Network [OSTI]

the mechanical, electrical, and magnetic side dynamics are developed, and simulations for both normalized RMS sprung mass acceleration versus stroke calculations and frequency response are executed. These simulations indicate that the pulse width modulation.... Acceleration fiequency response plot for multiple resistor system using four resistors with emphasis on stmke contml Normalized RMS curves for multiple resistor systems using four resistors 78 79 11. 1. Capacitor filter 11. 2. Parallel capacitor filter...

Lin, Wayne Chinn-Tzu

2012-06-07T23:59:59.000Z

155

Rare?Earth?Free Permanent Magnets for Electrical Vehicle Motors and Wind Turbine Generators: Hexagonal Symmetry Based Materials Systems Mn?Bi and M?type Hexaferrite  

SciTech Connect (OSTI)

The research we conducted focuses on the rare-earth (RE)-free permanent magnet by modeling, simulating, and synthesizing exchange coupled two-phase (hard/soft) RE-free core-shell nano-structured magnet. The RE-free magnets are made of magnetically hard core materials (high anisotropy materials including Mn-Bi-X and M-type hexaferrite) coated by soft shell materials (high magnetization materials including Fe-Co or Co). Therefore, our research helps understand the exchange coupling conditions of the core/shell magnets, interface exchange behavior between core and shell materials, formation mechanism of core/shell structures, stability conditions of core and shell materials, etc.

Hong, Yang-Ki [University of Alabama] [University of Alabama; Haskew, Timothy [University of Alabama] [University of Alabama; Myryasov, Oleg [University of Alabama] [University of Alabama; Jin, Sungho [University of California San Diego] [University of California San Diego; Berkowitz, Ami [University of California San Diego] [University of California San Diego

2014-06-05T23:59:59.000Z

156

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

SciTech Connect (OSTI)

A 30-pole, 6-kW prototype of a fractional-slot permanent magnet synchronous motor (PMSM) design has been developed to operate at a maximum speed of 6000 rpm [1,2]. This machine has significantly more inductance than regular PMSMs with distributed windings. The prototype was delivered in April 2006 to the Oak Ridge National Laboratory (ORNL) for testing and development of a suitable controller. To prepare for this test/control development effort, ORNL used PMSM models developed over a number of previous studies to preview the control issues that arise when a dynamic controller drives a high inductance PMSM machine during steady state performance evaluations. The detailed steady state model developed includes all motor and inverter loss mechanisms and was useful for assessing the performance of the dynamic controller before it was put into operation. This report documents the results of tests demonstrating the effectiveness of ORNL's simple low-cost control scheme during characterization of the fractional-slot concentrated windings (FSCW) PMSM motor. The control scheme is simple because only the supply voltage magnitude and the phase angle between the back-electromotive force (emf) and the supply voltage is controlled. It is low-cost because it requires no current or phase voltage sensors.

Patil, N.; Lawler, J.S.; McKeever, J.

2007-07-31T23:59:59.000Z

157

Design of a compact, permanent magnet electron cyclotron resonance ion source for proton and H{sub 2}{sup +} beam production  

SciTech Connect (OSTI)

A 2.45 GHz microwave ion source was developed at China Institute of Atomic Energy (CIAE) for proton beam production of over 60 mA [B.-Q. Cui, Y.-W. Bao, L.-Q. Li, W.-S. Jiang, and R.-W. Wang, Proceedings of the High Current Electron Cyclotron Resonance (ECR) Ion Source for Proton Accelerator, APAC-2001, 2001 (unpublished)]. For various proton beam applications, another 2.45 GHz microwave ion source with a compact structure is designed and will be built at CIAE as well for high current proton beam production. It is also considered to be used for the test of H{sub 2}{sup +} beam, which could be injected into the central region model cyclotron at CIAE, and accelerated to 5 MeV before extraction by stripping. The required ECR magnetic field is supplied by all the permanent magnets rather than electrical solenoids and six poles. The magnetic field distribution provided by this permanent magnets configuration is a large and uniformly volume of ECR zone, with central magnetic field of a magnitude of {approx}875 Gs[T. Taylor and J. S. C. Wills, Nucl. Instrum. Methods Phys. Res. A 309, 37 (1991)]. The field adjustment at the extraction end can be implemented by moving the position of the magnet blocks. The results of plasma, coupling with 2.45 GHz microwave in the ECR zone inside the ion source are simulated by particle-in-cell code to optimize the density by adjusting the magnetic field distribution. The design configuration of the ion source will be summarized in the paper.

Jia Xianlu; Zhang Tianjue; Wang Chuan; Zheng Xia; Yin Zhiguo; Zhong Junqing; Wu Longcheng; Qin Jiuchang [China Institute of Atomic Energy, P.O. Box 275(3), Beijing 102413 (China); Luo Shan [The 6th Department, Communication Command Academy, Wuhan 430010 (China)

2010-02-15T23:59:59.000Z

158

Memorandum, Approval of a Permanent Variance Regarding Static Magnetic Fields at Brookhaven National Laboratory (Variance 102 1)  

Broader source: Energy.gov [DOE]

Approval of a Permanenet Variance Regarding Static Magnetic Fields at Brookhaven National Laboratory (Variance 1021)

159

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

SciTech Connect (OSTI)

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

160

Abstract --For high-speed machines applications, eddy-current losses in the interior permanent magnet of synchronous  

E-Print Network [OSTI]

-current losses in magnets of PMSM, due to time harmonics of stator currents, has been developed [4] to consider of PMSM, due to space harmonics of magnetomotive force (MMF), have been presented in order t

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "replace permanent magnets" 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

High-Performance Control of Two Three-Phase Permanent-Magnet Synchronous Machines in an Integrated Drive for Automotive Applications  

SciTech Connect (OSTI)

The closed-loop control of an integrated dual AC drive system is presented to control two three-phase permanent-magnet motors. A five-leg inverter is employed in the drive system; three of the inverter legs are for a main traction motor, but only two are needed for a three-phase auxiliary motor by utilizing the neutral point of the traction motor. An integrated drive with reduced component count is therefore achieved by eliminating one inverter leg and its gate drivers. A modified current control scheme based on the rotor flux orientation principle is presented. Simulation and experimental results are included to verify the independent control capability of the integrated drive.

Tang, Lixin [ORNL; Su, Gui-Jia [ORNL

2008-01-01T23:59:59.000Z

162

Abstract--This paper discusses an optimum design of an ultra high-speed permanent-magnet synchronous motor  

E-Print Network [OSTI]

-magnet synchronous motor (PMSM), which is applied to a supercharger of an automotive engine. Although the motor (PMSM), which is specifically applied to the electric supercharger of the automotive engines. Although the PMSM is operated by an inverter with a 12-V DC bus voltage for an adjustable-speed drive, it must

Fujimoto, Hiroshi

163

Using electrical, magnetic and acoustic sensors to detect damage in segmental concrete pipes subjected to permanent ground displacement  

E-Print Network [OSTI]

Using electrical, magnetic and acoustic sensors to detect damage in segmental concrete pipes and Environmental Engineering, 2340 G.G. Brown Bldg., Ann Arbor, MI 48109, United States c Civil and Environmental Engineering, University of Rhode Island, Department of Civil and Environmental Engineering, Kingston, RI 02881

Lynch, Jerome P.

164

Tailoring Magnetic Properties in Bulk Nanostructured Solids  

E-Print Network [OSTI]

permanent magnets). Under specific temperature and applied magnetic field conditions, exchange coupling

Morales, Jason R.

2011-01-01T23:59:59.000Z

165

Microstructual investigation of mixed rar earth iron boron processed vis melt-spinning and high-pressure gas-atomization for isotrophic bonded permanent magnets  

SciTech Connect (OSTI)

A solid solution of three rare earths (RE) in the RE{sub 2}Fe{sub 14}B structure have been combined to create the novel mixed rare earth iron boron (MRE{sub 2}Fe{sub 14}B) alloy family. MRE{sub 2}Fe{sub 14}B exhibits reduced temperature dependent magnetic properties; remanence and coercivity. The desired form of MRE{sub 2}Fe{sub 14}B is a powder that can be blended with a polymer binder and compression or injection molded to form an isotropic polymer bonded permanent magnet (PBM). Commercially, Nd{sub 2}Fe{sub 14}B is the alloy of choice for PBMs. Powders of Nd{sub 2}Fe{sub 14}B are made via melt-spinning as can be MRE{sub 2}Fe{sub 14}B which allows for direct comparisons. MRE{sub 2}Fe{sub 14}B made using melt-spinning at high wheel speeds is overquenched and must be annealed to an optimal hard magnetic state. Due to the rare earth content in the MRE{sub 2}Fe{sub 14}B powders, they must be protected from the environment in which they operate. This protection is accomplished by using a modified fluidized bed process to grow a protective fluoride coating nominally 15nm thick, to reduce air oxidation. MRE{sub 2}Fe{sub 14}B has demonstrated reduced temperature dependent magnetic properties in ribbon and PBM form. The real challenge has been modifying alloy designs that were successfully melt-spun to be compatible with high-pressure gas-atomization (HPGA). The cooling rates in HPGA are lower than melt-spinning, as the powders are quenched via convective cooling, compared to melt-spinning, which quenches initially by conductive cooling. Early alloy designs, in gas atomized and melt-spun form, did not have similar phase compositions or microstructures. Alloy additions, such as the addition of zirconium as a nucleation catalyst, were successful in creating similar phases and microstructures in the HPGA powders and melt-spun ribbon of the same MRE{sub 2}Fe{sub 14}B composition.

Buelow, Nicholas Lee

2005-08-01T23:59:59.000Z

166

Influence of Time-Varying External Magnetic Fields on Trapped Fields in Bulk Superconductors  

E-Print Network [OSTI]

Large, single-grain bulk high-temperature superconductors (HTS) can trap magnetic fields over 17 T below 30 K and up to 3 T at 77 K, and have significant potential to replace permanent magnets, the fields from which are limited to significantly less...

Zou, Jin; Ainslie, Mark D.; Hu, Di; Cardwell, David A.

2014-12-12T23:59:59.000Z

167

analysis reveals permanent: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Index 21 Design and analysis aspects of radial flux air-cored permanent magnet wind generator system for direct battery charging applications. Open Access Theses and...

168

EA-1895: Lolo Creek Permanent Weir Construction near town of...  

Broader source: Energy.gov (indexed) [DOE]

EA to evaluate the potential environmental impacts of replacing an existing seasonal fish weir with a permanent weir, which would be used to monitor federally-listed Snake River...

169

CRADA Final Report: Application of Dual-Mode Invertor Control to Commercially Available Radial-Gap Permanent Magnet Motors - Vol. 1  

SciTech Connect (OSTI)

John Deere and Company (Deere), their partner, UQM Technologies, Inc. (UQM), and the Oak Ridge National Laboratory's (ORNL's) Power Electronics and Electric Machinery Research Center (PEEMRC) recently completed work on the cooperative research and development agreement (CRADA) Number ORNL 04-0691 outlined in this report. CRADA 04-0691 addresses two topical issues of interest to Deere: (1) Improved characterization of hydrogen storage and heat-transfer management; and (2) Potential benefits from advanced electric motor traction-drive technologies. This report presents the findings of the collaborative examination of potential operational and cost benefits from using ORNL/PEEMRC dual-mode inverter control (DMIC) to drive permanent magnet (PM) motors in applications of interest to Deere. DMIC was initially developed and patented by ORNL to enable PM motors to be driven to speeds far above base speed where the back-electromotive force (emf) equals the source voltage where it is increasingly difficult to inject current into the motor. DMIC is a modification of conventional phase advance (CPA). DMIC's dual-speed modes are below base speed, where traditional pulse-width modulation (PWM) achieves maximum torque per ampere (amp), and above base speed, where six-step operation achieves maximum power per amp. The modification that enables DMIC adds two anti-parallel thyristors in each of the three motor phases, which consequently adds the cost of six thyristors. Two features evaluated in this collaboration with potential to justify the additional thyristor cost were a possible reduction in motor cost and savings during operation because of higher efficiency, both permitted because of lower current. The collaborative analysis showed that the reduction of motor cost and base cost of the inverter was small, while the cost of adding six thyristors was greater than anticipated. Modeling the DMIC control displayed inverter efficiency gains due to reduced current, especially under light load and higher speed. This current reduction, which is the salient feature of DMIC, may be significant when operating duty cycles have low loads at high frequencies. Reduced copper losses make operation more efficient thereby reducing operating costs. In the Deere applications selected for this study, the operating benefit was overshadowed by the motor's rotational losses. Rotational losses of Deere 1 and Deere 2 dominate the overall drive efficiency so that their reduction has the greatest potential to improve performance. A good follow-up project would be to explore cost erective ways to reduce the rotational losses buy 66%.

Lawler, J.S. (U. Tennessee-Knoxville); McKeever, J.W.; Downing, M.E.; Stahlhut, R.D (John Deere); Bremmer, R. (John Deere); Shoemaker, J.M. (John Deere); Seksarian, A.K. (john Deere); Poore, B. (John Deere); Lutz, J. (UQM)

2006-05-01T23:59:59.000Z

170

High Temperature, Permanent Magnet Biased Magnetic Bearings  

E-Print Network [OSTI]

performance, high speed and high temperature applications like space vehicles, jet engines and deep sea equipment. The bearing system had a target design to carry a load equal to 500 lb-f (2225N). Another objective was to design and build a test rig fixture...

Gandhi, Varun R.

2010-07-14T23:59:59.000Z

171

E-Print Network 3.0 - alternating magnetic properties Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

BY A PARALLELEPI- Summary: magnetic field from permanent magnets in permanent-magnet motors -- An alternative method," IEEE Trans... Progress In Electromagnetics Research,...

172

Employee Replacement Costs  

E-Print Network [OSTI]

Employee Replacement Costs Arindrajit Dube, Eric Freeman andproperties of employee replacement costs, using a panel2008. We establish that replacement costs are sub- stantial

Dube, Arindrajit; Freeman, Eric; Reich, Michael

2010-01-01T23:59:59.000Z

173

Torque in PM Couplings: Comparison of Uniform and Radial Magnetization  

E-Print Network [OSTI]

coupling, Tile permanent magnet, Torque, Uniform magnetization, Radial magnetization,10 Three-dimensional calculation.11 I. INTRODUCTION12 M AGNETIC couplings are often realized with tile permanent magnets radially or uniformly13 magnetized. Tile permanent magnets radially magnetized allow us to obtain great couplings14

Paris-Sud XI, Université de

174

Are Permanent Magnets Really Permanent? | GE Global Research  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD)ProductssondeadjustsondeadjustAbout theOFFICEAmesApplication2 (CRAC 2SSRL27 Users'weeklyJuneAreAre

175

1982 IEEE TRANSACTIONS ON MAGNETICS, VOL. 44, NO. 8, AUGUST 2008 Analytical Calculation of the Magnetic Field Created  

E-Print Network [OSTI]

]. It is noticeable that in some applications, such as permanent-magnet motors [18] or magnetic couplings [19], tiles of the Magnetic Field Created by Permanent-Magnet Rings R. Ravaud, G. Lemarquand, V. Lemarquand, and C. Depollier analytical formulations, based on a coulombian approach, of the magnetic field created by permanent-magnet

Paris-Sud XI, Université de

176

> REPLACE THIS LINE WITH YOUR PAPER IDENTIFICATION NUMBER (DOUBLE-CLICK HERE TO EDIT) < 1 Abstract--Magnetic sensors capable of detecting tiny ac  

E-Print Network [OSTI]

> REPLACE THIS LINE WITH YOUR PAPER IDENTIFICATION NUMBER (DOUBLE-CLICK HERE TO EDIT) , PA 16802 USA. temperature and ultra-sensitive magnetometers. Such bulk sensors constructed from ME

Yener, Aylin

177

Machine Copy for Proofreading, Vol. x, yz, 2008 MAGNETIC COUPLINGS WITH CYLINDRICAL AND  

E-Print Network [OSTI]

--We present a synthesis of cylindrical magnetic couplings4 realized with tile permanent magnets whose using a cylindrical air gap and tile permanent magnets radially magnetized Figure 2. Magnetic coupling permanent magnets.32 33 Many papers dealing with the optimization of magnetic couplings34 use the finite

Paris-Sud XI, Université de

178

Rare-Earth-Free Nanostructure Magnets: Rare-Earth-Free Permanent Magnets for Electric Vehicle Motors and Wind Turbine Generators: Hexagonal Symmetry Based Materials Systems Mn-Bi and M-type Hexaferrite  

SciTech Connect (OSTI)

REACT Project: The University of Alabama is developing new iron- and manganese-based composite materials for use in the electric motors of EVs and renewable power generators that will demonstrate magnetic properties superior to today’s best rare-earth-based magnets. Rare earths are difficult and expensive to refine. EVs and renewable power generators typically use rare earths to make their electric motors smaller and more powerful. The University of Alabama has the potential to improve upon the performance of current state-of-the-art rare-earth-based magnets using low-cost and more abundant materials such as manganese and iron. The ultimate goal of this project is to demonstrate improved performance in a full-size prototype magnet at reduced cost.

None

2012-01-01T23:59:59.000Z

179

First SNS Target Replacement  

E-Print Network [OSTI]

First SNS Target Replacement Experience M. Dayton, M. Rennich, Van Graves, J. DeVore Presented by T.S. Department of Energy AHIP Workshop Oct. 2009 Overview · Initial Target Replacement · Target Maintenance-Battelle for the U.S. Department of Energy AHIP Workshop Oct. 2009 First SNS Target Replacement · Replacement

McDonald, Kirk

180

E-Print Network 3.0 - anisotropic magnetic properties Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

MAGNETS By K. HOSELITZ. Summary: . - Magnetic properties of anisotropic permanent magnet alloy as a function of field applied during cooling... of the magnet and in some cases...

Note: This page contains sample records for the topic "replace permanent magnets" 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

Magnetic Lossess Simulation in PM SM Drive by FE: Harmonic Superposition by Method of Locked Rotor  

E-Print Network [OSTI]

Permanent magnet synchronous machine (PMSM), with its simplicity, high efficiency even at low speeds, strong

Paris-Sud XI, Université de

182

Journal of Magnetism and Magnetic Materials 290291 (2005) 836838 Dynamic response limits of an elastic magnet  

E-Print Network [OSTI]

on the elastomagnetic coupling but also on the interaction among the microparticles magnetic moments depending as for possible applications [1,2]. When the magnetic particles are permanently magnetized and the matrix material. Bar shaped samples have been produced with the permanent magnetic moments preferentially oriented

Franzese, Giancarlo

183

Novel Flux Coupling Machine without Permanent Magnets  

Broader source: Energy.gov (indexed) [DOE]

optimization through the use of an excitation field. * Developed an analytical MATLAB program to provide performance versus speed curves under the voltage and current...

184

Permanent Magnetic Materials Discovery | The Ames Laboratory  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - September 2006 TheSteven AshbyDepartment ofGE'sOptimizationUSING C RAY'S

185

Novel Flux Coupling Machine without Permanent Magnets  

Broader source: Energy.gov (indexed) [DOE]

proprietary, confidential, or otherwise restricted information 2011 U.S. DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer...

186

Permanent magnet focused X-band photoinjector  

DOE Patents [OSTI]

A compact high energy photoelectron injector integrates the photocathode directly into a multicell linear accelerator with no drift space between the injection and the linac. High electron beam brightness is achieved by accelerating a tightly focused electron beam in an integrated, multi-cell, X-band rf linear accelerator (linac). The photoelectron linac employs a Plane-Wave-Transformer (PWT) design which provides strong cell-to-cell coupling, easing manufacturing tolerances and costs.

Yu, David U. L. (Rancho Palos Verdes, CA); Rosenzweig, James (Los Angeles, CA)

2002-09-10T23:59:59.000Z

187

Permanent Home Number: Residential Number  

E-Print Network [OSTI]

Permanent Home Number: Residential Number: Mobile: Please update my contact details. Signature nominated correspondence address as indicated below. Permanent Home Adress Residential Address Other Address (Must not be a PO Box) Residential Address (Must not be a PO Box) Other - Postal/Optional Address

Viglas, Anastasios

188

Analyzing Replacement Stock Alternatives  

E-Print Network [OSTI]

Replacement management strategy involves comparing the values of the breeding stock you own with the value of potential replacements, and then choosing the investment with the highest expected worth. This publication discusses the application...

Falconer, Lawrence; McGrann, James M.; Parker, John; Jones, Rodney

2008-10-21T23:59:59.000Z

189

Correction magnets for the Fermilab Recycler Ring  

SciTech Connect (OSTI)

In the commissioning of the Fermilab Recycler ring the need for higher order corrector magnets in the regions near beam transfers was discovered. Three types of permanent magnet skew quadrupoles, and two types of permanent magnet sextupoles were designed and built. This paper describes the need for these magnets, the design, assembly, and magnetic measurements.

James T Volk et al.

2003-05-27T23:59:59.000Z

190

II MODEL AND FEEDBACK LINEARIZING CONTROLLER 1 A Multilayer Perceptron Replaces a Feedback  

E-Print Network [OSTI]

in a permanent magnetic field DC Programa de P'os Gradua¸c~ao em Engenharia El'etrica, Pontif'icia Universidade magnetic field DC motor connected to a load via a gear train. The nonlinear load is a shaft with a mass and Feedback Linearizing Controller The servomechanism studied in this research consists of a permanent

Amaral, José Nelson

191

Progress In Electromagnetics Research B, Vol. 13, 120, 2009 MAGNETIC FIELD PRODUCED BY A TILE  

E-Print Network [OSTI]

by permanent magnets is very useful for optimizing alternate magnet structures or magnetic couplings PERMANENT MAGNET WHOSE POLARIZATION IS BOTH UNIFORM AND TANGENTIAL R. Ravaud, G. Lemarquand, V. Lemarquand field produced by a tile permanent magnet whose polarization is both tangential and uniform

Paris-Sud XI, Université de

192

MULTIGAN: A NEW MULTICHARGED ION SOURCE BASED ON AXISYMETRIC MAGNETIC STRUCTURE  

E-Print Network [OSTI]

's [3,4]) takes back the two Mono1000 rings made of permanent magnets (NdFeB Vacodym 655HR) coupling of the axisymetric magnetic structures made only of permanent magnets with a high operating frequency. The magnetic Gauss, the mirror ratio is 1.92. After the iron design and the permanent magnet ring used, a mechanical

Paris-Sud XI, Université de

193

Application for Replacement of Certificates, Permits, or Licenses Page 1 of 4  

E-Print Network [OSTI]

Application for Replacement of Certificates, Permits, or Licenses Page 1 of 4 Revised: 12/10/2012 OMB Control No. 0648-0272 Expiration Date: 11/30/2015 APPLICATION FOR REPLACEMENT OF CERTIFICATES Person ID: 3. Business Mailing Address: [ ] Permanent or [ ] Temporary 4. Date of Birth or Date

194

Radiation Source Replacement Workshop  

SciTech Connect (OSTI)

This report summarizes a Radiation Source Replacement Workshop in Houston Texas on October 27-28, 2010, which provided a forum for industry and researchers to exchange information and to discuss the issues relating to replacement of AmBe, and potentially other isotope sources used in well logging.

Griffin, Jeffrey W.; Moran, Traci L.; Bond, Leonard J.

2010-12-01T23:59:59.000Z

195

Diploma Replacement Order diploma-replace 1/12  

E-Print Network [OSTI]

Diploma Replacement Order diploma-replace 1/12 A replacement diploma may be ordered in the event of loss of or damage to the original diploma. Replacement diplomas are 17Ă? 14 ("mini" diplomas or letter-sized diplomas are no longer available). The replacement diploma fee is $50, payable by check or credit card

Shamos, Michael I.

196

Video face replacement  

E-Print Network [OSTI]

We present a method for replacing facial performances in video. Our approach accounts for differences in identity, visual appearance, speech, and timing between source and target videos. Unlike prior work, it does not ...

Dale, Kevin

197

REQUEST FOR REPLACEMENT DIPLOMA Name: ________________________________________________________________________  

E-Print Network [OSTI]

REQUEST FOR REPLACEMENT DIPLOMA Name. ________________________________________________________________________ First Middle Maiden Last REPLACEMENT DIPLOMA INFORMATION Please print your name exactly as you want it to appear on your replacement diploma. If your name has changed since your degree was awarded, and if you

Gering, Jon C.

198

A STRUCTURAL-MAGNETIC STRAIN MODEL FOR MAGNETOSTRICTIVE TRANSDUCERS  

E-Print Network [OSTI]

of a cylindrical Terfenol-D rod, a wound wire solenoid, an enclosing permanent magnet and a prestress mechanism strains and forces is provided by a magnetic bias generated by either the surrounding permanent magnet regimes are fully coupled, we focus here on the magnetic and mechanical aspects of the system with nearly

199

Magnetic infrasound sensor  

DOE Patents [OSTI]

A magnetic infrasound sensor is produced by constraining a permanent magnet inside a magnetic potential well above the surface of superconducting material. The magnetic infrasound sensor measures the position or movement of the permanent magnet within the magnetic potential well, and interprets the measurements. Infrasound sources can be located and characterized by combining the measurements from one or more infrasound sensors. The magnetic infrasound sensor can be tuned to match infrasound source types, resulting in better signal-to-noise ratio. The present invention can operate in frequency modulation mode to improve sensitivity and signal-to-noise ratio. In an alternate construction, the superconductor can be levitated over a magnet or magnets. The system can also be driven, so that time resolved perturbations are sensed, resulting in a frequency modulation version with improved sensitivity and signal-to-noise ratio.

Mueller, Fred M. (Los Alamos, NM); Bronisz, Lawrence (Los Alamos, NM); Grube, Holger (Los Alamos, NM); Nelson, David C. (Santa Fe, NM); Mace, Jonathan L. (Los Alamos, NM)

2006-11-14T23:59:59.000Z

200

E-Print Network 3.0 - acceptable residual magnetic Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

residual limb. A small Neodymium-Iron-Boron magnet... of a small permanent magnet into the distal residual ... Source: Peshkin, Michael A.- Department of Mechanical...

Note: This page contains sample records for the topic "replace permanent magnets" 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

E-Print Network 3.0 - atomic beam magnetic Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Darmstadt Collection: Physics 22 Vol. 33 (2002) ACTA PHYSICA POLONICA B No 8 PERMANENT-MAGNET MICROSTRUCTURES Summary: gradient magnetic force has been demonstrated for a beam of...

202

Replace / Renewal BUDGET ZZ106  

E-Print Network [OSTI]

Replace / Renewal BUDGET ZZ106 FUND: 126 CERTIFIED FOOD MANAGER CERTIFICATE RENEWAL Certificate Replacement Reason for Application: Replacement $15.00 Certificate Renewal Reason for Application: [Renewal application may be submitted up to 60 days prior to expiration.] Renewal - $10.00 Please Note: All

203

Fabrication of thin films for a small alternating gradient field magnetometer for biomedical magnetic sensing applications  

E-Print Network [OSTI]

. This is due to the addition of Cr, which decreases the magnetic moment of the films; magnetoelas- tic coupling magnetometers (AGFM) composed of permanent magnets are being developed for measuring magnetic moments in soil Si membrane with a cylindrical SmCo permanent magnet.2,3 The magnetic material attached

McHenry, Michael E.

204

Influence of the inductor shape, and the magnetization processes on a trapped magnetic flux in a superconducting  

E-Print Network [OSTI]

, the maximum value of remnant magnetic induction in a permanent magnet is about 1.5 Tesla for Nd where we have enough space (e.g. magnetic coupling, and axial motors applications) and the need

Boyer, Edmond

205

Gating of Permanent Molds for ALuminum Casting  

SciTech Connect (OSTI)

This report summarizes a two-year project, DE-FC07-01ID13983 that concerns the gating of aluminum castings in permanent molds. The main goal of the project is to improve the quality of aluminum castings produced in permanent molds. The approach taken was determine how the vertical type gating systems used for permanent mold castings can be designed to fill the mold cavity with a minimum of damage to the quality of the resulting casting. It is evident that somewhat different systems are preferred for different shapes and sizes of aluminum castings. The main problems caused by improper gating are entrained aluminum oxide films and entrapped gas. The project highlights the characteristic features of gating systems used in permanent mold aluminum foundries and recommends gating procedures designed to avoid common defects. The study also provides direct evidence on the filling pattern and heat flow behavior in permanent mold castings.

David Schwam; John F. Wallace; Tom Engle; Qingming Chang

2004-03-30T23:59:59.000Z

206

Enzyme replacement therapy for Pompe disease  

E-Print Network [OSTI]

CALIFORNIA, SAN DIEGO Enzyme Replacement Therapy for Pompe3 1.3 Enzyme Replacement Therapy for Pompe Disease…………………… 5Receptor ERT – Enzyme Replacement Therapy LSD – Lysosomal

Burris, Ryan Jonathan William

2010-01-01T23:59:59.000Z

207

On leave at MIT. Permanent address: Departamento de Quimica Inorga nica, Universidad de La Laguna, E-38200 La Laguna, Tenerife  

E-Print Network [OSTI]

interactions between electrons, such as magnetic coupling, can be strongly depen- dent on the crystallographic On leave at MIT. Permanent address: Departamento de Qui´mica Inorga´ nica, Universidad de La OF SOLID STATE CHEMISTRY 130, 35--41 (1997) ARTICLE NO. SC967267 Synthesis, Crystal Structure, and Magnetic

zur Loye, Hans-Conrad

208

Window Replacement, Rehabilitation, & Repair Guides - Building...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Window Replacement, Rehabilitation, & Repair Guides - Building America Top Innovation Window Replacement, Rehabilitation, & Repair Guides - Building America Top Innovation Effec...

209

POLICY GUIDANCE MEMORANDUM #23 Permanent and Nonpermanent Positions...  

Energy Savers [EERE]

3 Permanent and Nonpermanent Positions, Appointments, & CHRIS Codes POLICY GUIDANCE MEMORANDUM 23 Permanent and Nonpermanent Positions, Appointments, & CHRIS Codes DOE Guidance -...

210

SOLVING THE STAND-OFF PROBLEM FOR MAGNETIZED TARGET FUSION: PLASMA STREAMS AS DISPOSABLE ELECTRODES, PLUS A LOCAL SPHERICAL BLANKET  

SciTech Connect (OSTI)

In a fusion reactor based on the Magnetized Target Fusion approach, the permanent power supply has to deliver currents up to a few mega-amperes to the target dropped into the reaction chamber. All the structures situated around the target will be destroyed after every pulse and have to be replaced at a frequency of 1 to 10 Hz. In this paper, an approach based on the use of spherical blanket surrounding the target, and pulsed plasma electrodes connecting the target to the power supply, is discussed. A brief physic analysis of the processes associated with creation of plasma electrodes is discussed.

Ryutov, D D; Thio, Y F

2006-03-21T23:59:59.000Z

211

Energy Replacement Generation Tax Exemption  

Broader source: Energy.gov [DOE]

Iowa imposes a replacement generation tax of 0.06 cents ($0.0006) per kilowatt-hour (kWh) on various forms of electricity generated within the state. This tax is imposed in lieu of a property tax...

212

Virent is Replacing Crude Oil  

Broader source: Energy.gov [DOE]

Breakout Session 2A—Conversion Technologies II: Bio-Oils, Sugar Intermediates, Precursors, Distributed Models, and Refinery Co-Processing Virent is Replacing Crude Oil Randy Cortright, Founder & Chief Technology Officer, Virent

213

NACS Voice Mail Replacement Project  

E-Print Network [OSTI]

NACS Voice Mail Replacement Project Presented to the TPAG Monday, November 13, 2006 #12 criteria Integration with email is a key factor Taking a second look at Cisco & AVST Cost of Interactive

Brody, James P.

214

Buying Vs. Raising Replacement Heifers  

E-Print Network [OSTI]

When deciding on the best strategy for replacing heifers, beef cattle producers should weigh several factors. This publication discusses several such issues, including current and future market prices; herd size; pastures, facilities and management...

Cleere, Jason

2006-01-02T23:59:59.000Z

215

Magnetically attached sputter targets  

DOE Patents [OSTI]

An improved method and assembly for attaching sputtering targets to cathode assemblies of sputtering systems which includes a magnetically permeable material is described. The magnetically permeable material is imbedded in a target base that is brazed, welded, or soldered to the sputter target, or is mechanically retained in the target material. Target attachment to the cathode is achieved by virtue of the permanent magnets and/or the pole pieces in the cathode assembly that create magnetic flux lines adjacent to the backing plate, which strongly attract the magnetically permeable material in the target assembly. 11 figures.

Makowiecki, D.M.; McKernan, M.A.

1994-02-15T23:59:59.000Z

216

Direct control of air gap flux in permanent magnet machines  

DOE Patents [OSTI]

A method and apparatus for field weakening in PM machines uses field weakening coils (35, 44, 45, 71, 72) to produce flux in one or more stators (34, 49, 63, 64), including a flux which counters flux normally produced in air gaps between the stator(s) (34, 49, 63, 64) and the rotor (20, 21, 41, 61) which carries the PM poles. Several modes of operation are introduced depending on the magnitude and polarity of current in the field weakening coils (35, 44, 45, 71, 72). The invention is particularly useful for, but not limited to, the electric vehicle drives and PM generators.

Hsu, John S. (Oak Ridge, TN)

2000-01-01T23:59:59.000Z

217

PLASMA DIAGNOSTIC AND PERFORMANCE OF A PERMANENT MAGNET HALL THRUSTER  

E-Print Network [OSTI]

% to 80% in planetary missions. After half century of science and technology improvements, electric, Instituto de FĂ­sica, Universidade de BrasĂ­lia-UnB 70910-900 Brasilia-DF, Brazil Abstract Electric propulsion been developed by space agencies, space research institutes and industries in several countries

Boyer, Edmond

218

A doubly-fed permanent magnet generator for wind turbines  

E-Print Network [OSTI]

Optimum extraction of energy from a wind turbine requires that turbine speed vary with wind speed. Existing solutions to produce constant-frequency electrical output under windspeed variations are undesirable due to ...

Thomas, Andrew J. (Andrew Joseph), 1981-

2004-01-01T23:59:59.000Z

219

Evaluation of permanent magnets for high temperature operations  

E-Print Network [OSTI]

250 276 300 25 60 0 Temperature ( C) Fig. B. Tractive Force per unit Volume of Ni Cylinder vs. Temperature for barium ferrite. 'I. 2 1. 'I 'I. O O. e 0. 6 0. 7 Unannaallad ~ m g 0. 4 0. 6 OA 0. 3 0. 2 0. 1 0. 0 Cooling A noalls 24... 425 4% 0 75 '100125150175200225250275 0 Temperature ( C) 0 20 a 30 + 10 x 40 v SO Fig. lla. Tractive Force per unit Volume of Ni Cylinder vs. Temperature for Alnico 8, annealled from 0 to 50 hours in 10 hour steps. M E u m m 0 &i 'o 0 8 u...

Van Hees, Elizabeth

2012-06-07T23:59:59.000Z

220

High force density linear permanent magnet motors : "electromagnetic muscle actuators"  

E-Print Network [OSTI]

Actuator performance represents a key constraint on the capability of many engineered devices. Performance of these devices is often exceeded by their muscle-powered natural counterparts, inspiring the development of new, ...

Ruddy, Bryan P. (Bryan Paul), 1983-

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "replace permanent magnets" 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

A New Class of Switched Reluctance Motors without Permanent Magnets  

Broader source: Energy.gov (indexed) [DOE]

proprietary, confidential, or otherwise restricted information 2011 U.S. DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer...

222

High Performance Permanent Magnets for Advanced Motors | Department of  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarly Career Scientists'Montana.ProgramJulietip sheetK-4In 2013 many| Department of4EnergyBuilding

223

Permanent Magnet Development for Automotive Traction Motors | Department of  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarly Careerlumens_placard-green.epsEnergy1.pdfMarket | Department of Energy ReviewsFebruary 7,

224

Permanent Magnet Development for Automotive Traction Motors | Department of  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarly Careerlumens_placard-green.epsEnergy1.pdfMarket | Department of Energy ReviewsFebruary

225

Permanent Magnet Development for Automotive Traction Motors | Department of  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarly Careerlumens_placard-green.epsEnergy1.pdfMarket | Department of Energy ReviewsFebruaryEnergy

226

High Temperature, Buried Permanent Magnet, Brushless DC Motor  

E-Print Network [OSTI]

Circuit Model Predictions of the motor performance are accomplished with a closed loop electric circuit incorporating the motor. The circuit is broken down into three sub-circuits which are the equivalent generator as motor rotating, the coil pair...,Kang, Jungu Lee, Zhiyang Wang and others who worked with me in Vibration Control and Electrormechanics Laboratory. I also would like to thank Dr. Jinfang Liu and Dr. Heeju Choi at Electron Energy Corporation who constantly support our work. Finally, thanks...

Zhang, Zhengxin

2010-10-12T23:59:59.000Z

227

Permanent magnet helicon source for ion propulsion Francis F. Chen  

E-Print Network [OSTI]

. These ion energy peaks at the 29 eV plasma potential and at 47 eV behind the DL. The latter is supersonic, size, impulse, and gas efficiency of the thruster. This paper concerns the source itself and shows , which should yield much higher ion currents than reported so far. The design principles have been

Chen, Francis F.

228

Jiangxi Jinli Permanent Magnet Technology Co Ltd | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of Inspector GeneralDepartmentAUDIT REPORTOpenWende New Energy Co Ltd Jump to: navigation, search Name:

229

A New Class of Switched Reluctance Motors without Permanent Magnets |  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up from theDepartment(October-DecemberBasedToward a More Secure and CleanerRegeneration

230

A New Class of Switched Reluctance Motors without Permanent Magnets |  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up from theDepartment(October-DecemberBasedToward a More Secure and

231

Novel Flux Coupling Machine without Permanent Magnets - U Machine |  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l L d F S iPartnershipEnergy University57Department1 DOEDepartment of

232

Novel Flux Coupling Machine without Permanent Magnets | Department of  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l L d F S iPartnershipEnergy University57Department1 DOEDepartment

233

Novel Flux Coupling Machine without Permanent Magnets | Department of  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l L d F S iPartnershipEnergy University57Department1

234

Vehicle Technologies Office Merit Review 2014: Permanent Magnet Development  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy Usage »of EnergyTheTwoVulnerabilities |ImprovedMaterialsfor Automotive Traction

235

Transient Peak Currents in Permanent Magnet Synchronous Motors  

E-Print Network [OSTI]

synchronous motors (PMSM) became more and more popular for these applications. The performance of PMSM drives not be triggered at motor operating points, for which the SSC current behavior will damage the PMSM drive. An analysis of PMSM behavior with

Paderborn, Universität

236

Origin of recoil hysteresis loops in SmCo/Fe exchange-spring magnets J. S. Jiang, J. E. Pearson, and S. D. Bader  

E-Print Network [OSTI]

in exchange-coupled permanent magnets. However, in element-specific recoil loop measurements on Sm, exchange-coupled nanocomposite permanent magnets can have magnetic properties that are superior to those of single-phase magnets.1,2 In nanocompos- ite magnets, the exchange coupling between the two phases

Liu, J. Ping

237

Multipole Analysis of Circular Cylindircal Magnetic Systems  

SciTech Connect (OSTI)

This thesis deals with an alternate method for computing the external magnetic field from a circular cylindrical magnetic source. The primary objective is to characterize the magnetic source in terms of its equivalent multipole distribution. This multipole distribution must be valid at points close to the cylindrical source and a spherical multipole expansion is ill-equipped to handle this problem; therefore a new method must be introduced. This method, based upon the free-space Green's function in cylindrical coordinates, is developed as an alternative to the more familiar spherical harmonic expansion. A family of special functions, called the toroidal functions or Q-functions, are found to exhibit the necessary properties for analyzing circular cylindrical geometries. In particular, the toroidal function of zeroth order, which comes from the integral formulation of the free-space Green's function in cylindrical coordinates, is employed to handle magnetic sources which exhibit circular cylindrical symmetry. The toroidal functions, also called Q-functions, are the weighting coefficients in a ''Fourier series-like'' expansion which represents the free-space Green's function. It is also called a toroidal expansion. This expansion can be directly employed in electrostatic, magnetostatic, and electrodynamic problems which exhibit cylindrical symmetry. Also, it is shown that they can be used as an alternative to the Elliptic integral formulation. In fact, anywhere that an Elliptic integral appears, one can replace it with its corresponding Q-function representation. A number of problems, using the toroidal expansion formulation, are analyzed and compared to existing known methods in order to validate the results. Also, the equivalent multipole distribution is found for most of the solved problems along with its corresponding physical interpretation. The main application is to characterize the external magnetic field due to a six-pole permanent magnet motor in terms of its equivalent multipole distribution.

J Selvaggi

2006-01-09T23:59:59.000Z

238

Development of novel high-performance six-axis magnetically levitated instruments for nanoscale applications  

E-Print Network [OSTI]

and the sample. While working in noncontact mode the AFM tip does not touch the sample but gets the topographic image of sample from attractive force [13]. The AFM have resolution up to 10 pm. The basic working principle of AFM is very much like a record...-earth permanent-magnet-biased magnetic-bearing suspension [48]. The permanent magnet provides bias flux and the electromagnet can increase or reduce flux of the permanent magnet. The flux path of the electromagnet does not pass through the permanent magnet so...

Verma, Shobhit

2005-11-01T23:59:59.000Z

239

Anytime Replanning Using Local Subplan Replacement  

E-Print Network [OSTI]

Anytime Replanning Using Local Subplan Replacement A Dissertation Presented to the faculty how local subplan replacement can be utilized to implement an anytime planning system that devises new plans to accommodate plan failures. Local subplan replacement consists of selecting subsequences

Ferrer, Gabriel J.

240

Abstract This paper investigates the steady-state and the transient performances of an axial magnetic coupling by using  

E-Print Network [OSTI]

and measurements. Index Terms-- Analytical model, magnetic field, axial coupling, permanent magnets, pull-pitch ratio p Pole-pair number Torque angle Br Remanence of the permanent magnets K Torsional stiffness II tolerate shaft misalignment. As shown in Fig. 1, the studied axial magnetic coupling consists of two discs

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "replace permanent magnets" 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

Removal of a Permanent IVC Filter  

SciTech Connect (OSTI)

Inferior vena cava (IVC) filters are increasingly used for prevention of life-threatening pulmonary emboli in patients who have contraindications to anticoagulation therapy. We report a case of the removal of a permanent IVC filter, which was inadvertently inserted due to an incorrect ultrasound report.

Kumar, Bangalore C. Anil [Queen's Medical Centre, Department of Radiology (United Kingdom)], E-mail: anil.kumar@doctors.org.uk; Chakraverty, Sam; Zealley, Ian [Ninewells Hospital, Department of Radiology (United Kingdom)

2006-02-15T23:59:59.000Z

242

Magnetic differential torque sensor  

SciTech Connect (OSTI)

A new torque sensor structure is presented. The basic idea is a simple torque sensor with a variable magnetic circuit excited by an axially magnetized permanent magnet ring. The circuit is constituted by iron toothed rings, whose teeth relative position changes whenever an applied torque twists the rotating shaft. A Hall probe measures the induction in an airgap where the induction is uniform. The new structure is an association of two previous ones, thus creating a differential system with the related advantages: diminution of thermal drifts, zero mean value for the signal. The new magnetic circuit is studied by calculating equivalent reluctances through energy calculations and by using electrical analogies.

Lemarquand, V.; Lemarquand, G. [Univ. de Savoie, Annecy-le-Vieux (France)] [Univ. de Savoie, Annecy-le-Vieux (France)

1995-11-01T23:59:59.000Z

243

Stanford University Mercury Thermometer Replacement  

E-Print Network [OSTI]

Stanford University Mercury Thermometer Replacement Program Instructions for Reuniting Separated Fluid Column of Non-Mercury Thermometer Heating Method Heat the thermometers bulb in an upright position of the thermometer. Note that over filling the expansion chamber will break the thermometer. Tap the thermometer

244

REPLACEMENT DIPLOMA REQUEST FORM Dear Alumni  

E-Print Network [OSTI]

REPLACEMENT DIPLOMA REQUEST FORM Dear Alumni: It is our understanding that you need to replace your original diploma. We are glad to help you attain a replacement diploma. The items listed below are required replacement diploma. Please feel free to contact the LGBT Center at 617-627-3770 if you have questions

Dennett, Daniel

245

EA-1895: Lolo Creek Permanent Weir Construction near town of Weippe, Clearwater County, Idaho  

Broader source: Energy.gov [DOE]

DOE’s Bonneville Power Administration is preparing this EA to evaluate the potential environmental impacts of replacing an existing seasonal fish weir with a permanent weir, which would be used to monitor federally-listed Snake River steelhead and collect spring Chinook salmon adults to support ongoing supplementation programs in the watershed. The Bureau of Land Management, a cooperating agency, preliminarily determined Lolo Creek to be suitable for Congressional designation into the Wild and Scenic River System. The EA includes a Wild and Scenic River Section 7 analysis.

246

Contactless magnetic brake for automotive applications  

E-Print Network [OSTI]

consumption due to power assistance, and requirement for anti-lock controls. To solve these problems, a contactless magnetic brake has been developed. This concept includes a novel flux-shunting structure to control the excitation flux generated by permanent...

Gay, Sebastien Emmanuel

2009-05-15T23:59:59.000Z

247

Magnetic multipole redirector of moving plasmas  

DOE Patents [OSTI]

A method and apparatus for redirecting moving plasma streams using a multiple array of magnetic field generators (e.g., permanent magnets or current bearing wires). Alternate rows of the array have opposite magnetic field directions. A fine wire mesh may be employed to focus as well as redirect the plasma.

Crow, James T. (Albuquerque, NM); Mowrer, Gary R. (Cedar Crest, NM)

1999-01-01T23:59:59.000Z

248

When Do Commercial Reactors Permanently Shut Down?  

Reports and Publications (EIA)

For those wishing to obtain current data, the following resources are available: U.S. reactors, go to the Energy Information Administration's nuclear reactor shutdown list. (Note: As of April 30, 2010, the last U.S. reactor to permanently shut down was Big Rock Point in 1997.) Foreign Reactors, go to the Power Reactor Information System (PRIS) on the International Atomic Energy Agency's website.

2011-01-01T23:59:59.000Z

249

E-Print Network 3.0 - arbitrary magnetic field Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Research Team Collection: Engineering ; Materials Science 24 Ironless Permanent Magnet Motors: Three-Dimensional Analytical Calculation Summary: improvement in the calcu- lation...

250

E-Print Network 3.0 - annual magnet technology Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

State University Collection: Chemistry 11 LITERATURE SURVEY OF PERMANENT MAGNET AC MOTORS AND P. PILIAY, MEMBER, IEEE, AND P. EREERE Summary: M.A. Rahman, "High efficiency...

251

E-Print Network 3.0 - axisymmetric magnetic field Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

cores are presumably governed by a balance... . The inner sphere encloses a permanent magnet providing a ... Source: Brito, Daniel - Laboratoire de Gophysique Interne et...

252

E-Print Network 3.0 - assessing dynamic magnetic Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Geosciences ; Physics ; Plasma Physics and Fusion 51 LITERATURE SURVEY OF PERMANENT MAGNET AC MOTORS AND P. PILIAY, MEMBER, IEEE, AND P. EREERE Summary: .A. Little, "Dynamic...

253

Magnetic Design for the PediaFlow Ventricular Assist Device  

E-Print Network [OSTI]

. The magnetic design includes permanent-magnet (PM) passive bearings for radial support of the rotor for rotation. These components are closely coupled both geometrically and magnetically, and were thereforeMagnetic Design for the PediaFlow Ventricular Assist Device *Myounggyu D. Noh, James F. Antaki

Paden, Brad

254

2598 IEEE TRANSACTIONS ON MAGNETICS, VOL. 38, NO. 5, SEPTEMBER 2002 Interparticle Interactions in Annealed FePt  

E-Print Network [OSTI]

are also known to be permanent magnetic materials [5]. The energy products of hard­soft exchange coupled Fe for producing hard magnetic nanocomposites. Index Terms--Exchange coupling, FePt nanoparticles, magneti- zation offer a novel and convenient approach for producing permanent magnetic materials. However, to reach

Wang, Zhong L.

255

Enhanced coercivity in thermally processed ,,Nd,Dy...,,Fe,Co,Nb,B...5.5/ -Fe nanoscale multilayer magnets  

E-Print Network [OSTI]

and theoretical research has been done on exchange-coupled hard-soft1­14 permanent magnets. However, up to now, ex, the addition of the soft phase to the hard phase enhances the remanence but deteriorates the permanent-magnet,10 exchange-coupled -Fe/Nd­Fe­B multilayer magnets as investigated by Shindo et al.11 the Nd

Liu, J. Ping

256

Kittiwakes strategically reduce investment in replacement clutches  

E-Print Network [OSTI]

Kittiwakes strategically reduce investment in replacement clutches Julien Gasparini1,*, Alexandre). In birds, egg production is lower in replacement clutches than in first clutches, but it is unknown whether the replacement clutch is produced) or from a strategic allocation of resources between the two breeding attempts

Alvarez, Nadir

257

General Adaptive Replacement Policies Yannis Smaragdakis  

E-Print Network [OSTI]

General Adaptive Replacement Policies Yannis Smaragdakis College of Computing Georgia Institute of Technology yannis@cc.gatech.edu ABSTRACT We propose a general scheme for creating adaptive replace- ment any two existing replacement policies so that the resulting policy provably can never perform worse

Smaragdakis, Yannis

258

Cooperative Determination on Cache Replacement Candidates  

E-Print Network [OSTI]

Cooperative Determination on Cache Replacement Candidates for Transcoding Proxy Caching Keqiu Li1- mination on cache replacement candidates for transcoding proxies. An original model which determines cache replacement candidates on all can- didate nodes in a coordinated fashion with the objective of minimizing

Chin, Francis Y.L.

259

Replacement Diploma Request University of Massachusetts Lowell  

E-Print Network [OSTI]

Replacement Diploma Request Mail to: University of Massachusetts Lowell Office of the Registrar 883. * Please use a separate form for each diploma request. * All replacement diplomas are University of Massachusetts Lowell diplomas. Replacement diplomas with the name of any predecessor institution

Massachusetts at Lowell, University of

260

Cache Replacement Policy Revisited Mohamed Zahran  

E-Print Network [OSTI]

Cache Replacement Policy Revisited Mohamed Zahran Electrical Engineering Department City University of New York mzahran@ccny.cuny.edu Abstract Cache replacement policy is a major design parameter of any memory hierarchy. The efficiency of the replace- ment policy affects both the hit rate and the access la

Zahran, Mohamed M.

Note: This page contains sample records for the topic "replace permanent magnets" 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

Article ID #eqr106 REPLACEMENT STRATEGIES  

E-Print Network [OSTI]

Article ID #eqr106 REPLACEMENT STRATEGIES Elmira Popova Associate Professor, Department)-296-5795 e-mail: popovai@seattleu.edu Corresponding Contributor: Elmira Popova Keywords: Replacement Policies define what is a replacement policy for a system that fails randomly in time and its main characteristics

Popova, Elmira

262

Replacement Diploma Request University of Massachusetts Lowell  

E-Print Network [OSTI]

Replacement Diploma Request Mail to: University of Massachusetts Lowell Office of the Registrar 220. * Please use a separate form for each diploma request. * All replacement diplomas are University of Massachusetts Lowell diplomas. Replacement diplomas with the name of any predecessor institution

Massachusetts at Lowell, University of

263

Type-Logical Hyperedge Replacement Grammars  

E-Print Network [OSTI]

Type-Logical and Hyperedge Replacement Grammars Draft Richard Moot LaBRI (CNRS), INRIA Bordeaux SW2009 #12;CONTENTS 1 Introduction 1 2 Hyperedge Replacement Grammars 3 2.1 Hypergraphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Hyperedge Replacement . . . . . . . . . . . . . . . . . . . . . . . 4 2.3 Hyperedge

Paris-Sud XI, Université de

264

PeopleAdmin Staff Straight Replacement  

E-Print Network [OSTI]

1 PeopleAdmin ­ Staff Straight Replacement Guide #12;2 The staff straight replacement module will be used by hiring managers to request vacant, benefited positions be advertisedAdmin system, you will see this view. To begin the staff straight replacement process, you should click BEGIN

Hutcheon, James M.

265

Passive magnetic bearing system  

DOE Patents [OSTI]

An axial stabilizer for the rotor of a magnetic bearing provides external control of stiffness through switching in external inductances. External control also allows the stabilizer to become a part of a passive/active magnetic bearing system that requires no external source of power and no position sensor. Stabilizers for displacements transverse to the axis of rotation are provided that require only a single cylindrical Halbach array in its operation, and thus are especially suited for use in high rotation speed applications, such as flywheel energy storage systems. The elimination of the need of an inner cylindrical array solves the difficult mechanical problem of supplying support against centrifugal forces for the magnets of that array. Compensation is provided for the temperature variation of the strength of the magnetic fields of the permanent magnets in the levitating magnet arrays.

Post, Richard F.

2014-09-02T23:59:59.000Z

266

New energy replacement method for resonant power supplies  

SciTech Connect (OSTI)

The Resonant Power Supply is an economically and technically advanced solution for Rapid Cycling Accelerators. Several papers dealt with the design and operation of these power supplies, however, the energy replacement methods were not discussed in the past. This paper analyzes different energy-replacement methods and presents a new method. This method uses a 24-pulse converter to regulate the magnet current during flat-top and injection periods and replaces the energy loss by charging the accelerator capacitor bank during the flat-top, reset and injection periods, charge is injected in the circuit during the acceleration period, when it replaces the energy loss. This paper compares the new method with the existing ones. The analyses proved the feasibility of the proposed method. The operation of the proposed method was verified by a model experiment, which showed that the new circuit can be controlled accurately and operates with smaller disturbances to the power line than the existing systems. 2 refs., 6 figs., 1 tab.

Karady, G.G.; Thiessen, H.A.

1989-01-01T23:59:59.000Z

267

Abstract--Temperature, current density and magnetic field distributions in YBCO bulk superconductor during a pulsed-field  

E-Print Network [OSTI]

-- bulk YBaCuO, stored magnetic energy, thermal coupling, magnetization, modelling. I. INTRODUCTION HE as cryo-permanent magnets [1], [2]. To magnetize the HTS, pulsed field magnetization (PFM) process1 Abstract-- Temperature, current density and magnetic field distributions in YBCO bulk

Paris-Sud XI, Université de

268

E-Print Network 3.0 - anisotropic molecular magnets Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

A nanoneedle with a magnetic bead at one end is immobilized at the end by a permanent... magnet in the water and its rotational Brownian ... Source: Boehringer, Karl F.-...

269

E-Print Network 3.0 - aligned magnetic field Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Physics 56 Wireless Control of Magnetic Helical Microrobots using a Rotating-Permanent-Magnet Manipulator Summary: access to hard-to-reach locations in the body. Prior work focused...

270

Amendment 80 vessel replacement 1 Implementation and of Amendment 80 Vessel Replacement Provisions  

E-Print Network [OSTI]

Amendment 80 vessel replacement 1 Implementation and of Amendment 80 Vessel Replacement Provisions vessels to use non-qualifying vessels in the sector, thus allowing replacement of a lost qualifying vessel of the CRP ambiguous as to whether replacement of qualifying vessels with non-qualifying vessels

271

Evaluation of Options for Permanent Geologic Disposal of Spent...  

Broader source: Energy.gov (indexed) [DOE]

policy decisions regarding strategies for the management and permanent disposal of spent nuclear fuel (SNF) and high-level radioactive waste (HLW) in the United States requiring...

272

PHYSICAL REVIEW B 89, 144404 (2014) Subpicosecond magnetization dynamics in TbCo alloys  

E-Print Network [OSTI]

for magneto-optical recording and the permanent magnet industry. The magnetization of the alloy results from, the magnetizations of the two sublattices are exchange coupled antiferromagnetically and the alloys are called magnetization dynamics of the two antiparallel coupled magnetic sublattices (i.e., Gd and FeCo) after laser

Aeschlimann, Martin

273

Progress In Electromagnetics Research B, Vol. 16, 333349, 2009 MAGNETIC COUPLINGS WITH CYLINDRICAL AND  

E-Print Network [OSTI]

coupling using a cylindrical air gap and tile permanent magnets radially magnetized. Figure 2. MagneticProgress In Electromagnetics Research B, Vol. 16, 333­349, 2009 MAGNETIC COUPLINGS WITH CYLINDRICAL--This paper presents a comparison of cylindrical and plane air gap magnetic couplings in which the tile

Paris-Sud XI, Université de

274

Magnetic Nanoparticle Capilary Flow as a Replacement for Lateral Flow  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: VegetationEquipment Surfaces and InterfacesAdministration -Lowell L.FallU . SChromatography - Energy

275

LED Replacements for Linear Fluorescent Lamps Webcast  

Broader source: Energy.gov [DOE]

In this June 20, 2011 webcast on LED products marketed as replacements for linear fluorescent lamps, Jason Tuenge of the Pacific Northwest National Laboratory (PNNL) discussed current Lighting...

276

Optimal scheduling for replacing perimeter guarding unmanned ...  

E-Print Network [OSTI]

difference between charging batteries, automatically replacing batteries [11] or ... the discussion below to the use of batteries and battery charge, without loss of ...

2014-08-20T23:59:59.000Z

277

Investigation of Cooling and Dehumidification Energy Use and Indoor Thermal Conditions in Polk County Schools Permanent Replacement Classroom Buildings  

E-Print Network [OSTI]

of this research was to compare the energy consumption and interior conditions of the autoclaved aerated concrete (AAC) construction with an unvented roof assembly to that of the conventional metal framing and concrete panel buildings. Four buildings, 2 metal...

Moyer, N. A.; Cummings, J. B.; Chasar, D.

2002-01-01T23:59:59.000Z

278

Magnetic machines and power electronics for power MEMS applications  

E-Print Network [OSTI]

This thesis presents the modeling, design, and characterization of microfabricated, surface-wound, permanent-magnet (PM) generators, and their power electronics, for use in Watt-level Power MEMS applications such as a ...

Das, Sauparna, 1979-

2005-01-01T23:59:59.000Z

279

Methods to detect faulty splices in the superconducting magnet system of the LHC  

SciTech Connect (OSTI)

The incident of 19 September 2008 at the LHC was caused by a faulty inter-magnet splice of about 200 n{Omega} resistance. Cryogenic and electrical techniques have been developed to detect other abnormal splices, either between or inside the magnets. The existing quench protection system can be used to detect internal splices with R > 20 n{Omega}. Since this system does not cover the bus between magnets, the cryogenic system is used to measure the rate of temperature rise due to ohmic heating. Accuracy of a few mK/h, corresponding to a few Watts, has been achieved, allowing detection of excess resistance, if it is more than 40 n{Omega} in a cryogenic subsector (two optical cells). Follow-up electrical measurements are made in regions identified by the cryogenic system. These techniques have detected two abnormal internal magnet splices of 100 n{Omega} and 50 n{Omega} respectively. In 2009, this ad hoc system will be replaced with a permanent one to monitor all splices at the n{Omega} level.

Bailey, R.; Bellesia, B.; Lasheras, N.Catalan; Dahlerup-Petersen, K.; Denz, R.; Robles, C.; Koratzinos, M.; Pojer, M.; Ponce, L.; Saban, R.; Schmidt, R.; /CERN /Fermilab /Moscow, INR /Cracow, INP

2009-05-01T23:59:59.000Z

280

Fluorescent lamp with static magnetic field generating means  

DOE Patents [OSTI]

A fluorescent lamp wherein magnetic field generating means (e.g., permanent magnets) are utilized to generate a static magnetic field across the respective electrode structures of the lamp such that maximum field strength is located at the electrode's filament. An increase in efficacy during operation has been observed. 2 figs.

Moskowitz, P.E.; Maya, J.

1987-09-08T23:59:59.000Z

Note: This page contains sample records for the topic "replace permanent magnets" 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

Crystallization Behavior, Nanostructure and Magnetic Properties of Melt-spun (Nd,Pr,Dy)2(Fe,Co,Mo)14B/-Fe Nanocomposite Magnets  

E-Print Network [OSTI]

behavior, phase evolution, nanostructure, exchange coupling and hard magnetic properties of melt-spun Nd2 extensive attention for the development of novel permanent magnets with high magnetic performance [1, exchange coupling and magnetic properties of the nanocomposites. In the present work, the crystallization

Garmestani, Hamid

282

Vehicle Technologies and Bus Fleet Replacement Optimization  

E-Print Network [OSTI]

1 Vehicle Technologies and Bus Fleet Replacement Optimization: problem properties and sensitivity: R41 #12;2 Abstract This research presents a bus fleet replacement optimization model to analyze hybrid and conventional diesel vehicles, are studied. Key variables affecting optimal bus type

Bertini, Robert L.

283

Magnetic switch for reactor control rod  

SciTech Connect (OSTI)

This patent describes a control rod system for a nuclear reactor utilizing an electromagnetic grapple mechanism for holding and releasing a control rod, the improvement comprising a magnetic reed switch assembly having a Curie-point magnetic shunt and responsive to reactor coolant temperature for short circuiting the electromagnetic grapple mechanism causing release of the control rod when the coolant temperature reaches the Curie-point of the magnetic shunt. The magnetic reed switch assembly includes a: a permanent magnet, a pair of magnetic pole pieces located at and in contact with opposite ends of the permanent magnet, the Curie-point magnetic shunt being positioned adjacent the permanent magnet and in contact with the pair of magnetic pole pieces, and a reed switch positioned intermediate the pole pieces and provided with a pair of ferromagnetic reeds, a nonmagnetic enclosure around the reeds, a first of the reeds being secured at one end to a first of the pair of pole pieces, a second of the reeds having one end extending into and secured to a hollow member positioned in and extending through a second of the pair of pole pieces, the one end of the second of the reeds secured to a condector adapted to be connected to the electromagnetic grapple mechanism.

Germer, J.H.

1986-04-15T23:59:59.000Z

284

Feedback Control of a Permanent Magnet Biased, Homopolar Magnetic Bearing System  

E-Print Network [OSTI]

system is done in Matlab to test for stability and an iterative approach leads to optimum values of proportional and derivative gain pairs. The notch filter locations are also determined through this closed loop iterative simulation....

Wadhvani, Vishal Ashok

2011-08-08T23:59:59.000Z

285

Magnetic Patterning of Permanent-Magnet Rotors for Microscale Motor/Generators  

E-Print Network [OSTI]

offers three advantages. First, eliminating the integrated winding permits simpler MH design element modeling 1. INTRODUCTION High power-density, microscale, axial-flux, PM machines [1-3] typically (Thickness = 0.5 mm, OD=9.5 mm) encased in a Ti adaptor used for microscale power generator [1]; (b

286

E-Print Network 3.0 - alloy magnets co-sm-cu-fe-zr Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

should be achieved preferably with a minimum of magnet alloy... hardening permanent magnet alloys which can be worked by hot or cold working methods. Here we have... there are...

287

Page Replacement Algorithms To use a simulation for evaluating various page replacement algorithms studied in class.  

E-Print Network [OSTI]

Operating Systems CSI3131 Lab 4 Winter 2011 Page Replacement Algorithms Objective To use a simulation for evaluating various page replacement algorithms studied in class. Description (Please read to compare the performance of each page replacement algorithm. The constructor of this class contains

Stojmenovic, Ivan

288

Permanence : aligning architecture, nuclear waste, and the Public  

E-Print Network [OSTI]

Permanence is intended as a provocation to question the current relationship of time and architecture. Architecture has always had a relationship with time, but historically this relationship has been troubled. In 2013 we ...

Maher, John, III (John Edward)

2014-01-01T23:59:59.000Z

289

Remanence enhancement in magnetically interacting particles Heliang Qu and Jiang Yu Li*  

E-Print Network [OSTI]

, which completely characterizes the remanence of magnets if the exchange coupling is negligible of remanence for most permanent magnets, the re- cent development of exchange-spring magnets make the asRemanence enhancement in magnetically interacting particles Heliang Qu and Jiang Yu Li* Department

Li, Jiangyu

290

Replacement solvents for use in chemical synthesis  

DOE Patents [OSTI]

Replacement solvents for use in chemical synthesis include polymer-immobilized solvents having a flexible polymer backbone and a plurality of pendant groups attached onto the polymer backbone, the pendant groups comprising a flexible linking unit bound to the polymer backbone and to a terminal solvating moiety. The polymer-immobilized solvent may be dissolved in a benign medium. Replacement solvents for chemical reactions for which tetrahydrofuran or diethyl may be a solvent include substituted tetrahydrofurfuryl ethers and substituted tetrahydro-3-furan ethers. The replacement solvents may be readily recovered from the reaction train using conventional methods.

Molnar, Linda K. (Philadelphia, PA); Hatton, T. Alan (Sudbury, MA); Buchwald, Stephen L. (Newton, MA)

2001-05-15T23:59:59.000Z

291

Toroidal field coil replacement study for the International Thermonuclear Experimental Reactor (ITER)  

SciTech Connect (OSTI)

The objective of this study is to develop an estimate of the time required to replace a failed toroidal field (TF) coil in the International Thermonuclear Experimental Reactor (ITER). This estimate is based on the current ITER design which resulted from the Conceptual Design Activities began in spring of 1988 and ending in December 1990. Although the TF Coils in ITER are designated permanent components and expected to last the life of the plant, the history of failures of large coils in fusion devices has prompted an assessment of the down time that might be required for replacement of a failed TF coil in ITER. The difficulty of replacement of a TF Coil in ITER is compounded by the large physical size of ITER, and the radiation fields which necessitate the use of remote handling equipment for most maintenance activities. Since 10 out of 16 TF coils are adjacent to either a Neutral Beam Injector (NBI) port or a remote handling (RH) port, it is probable that a failed TF Coil will be in one of these inconvenient locations. For this study, TF coil number 3 is assumed to fail and its replacement will be evaluated as a typical case. TF coil number 3 is located between a remote handling port ({number sign}3) and a port allocated to the lower hybrid ({number sign}4).

Not Available

1991-08-01T23:59:59.000Z

292

Toroidal field coil replacement study for the International Thermonuclear Experimental Reactor (ITER)  

SciTech Connect (OSTI)

The objective of this study is to develop an estimate of the time required to replace a failed toroidal field (TF) coil in the International Thermonuclear Experimental Reactor (ITER). This estimate is based on the current ITER design which resulted from the Conceptual Design Activities began in spring of 1988 and ending in December 1990. Although the TF Coils in ITER are designated permanent components and expected to last the life of the plant, the history of failures of large coils in fusion devices has prompted an assessment of the down time that might be required for replacement of a failed TF coil in ITER. The difficulty of replacement of a TF Coil in ITER is compounded by the large physical size of ITER, and the radiation fields which necessitate the use of remote handling equipment for most maintenance activities. Since 10 out of 16 TF coils are adjacent to either a Neutral Beam Injector (NBI) port or a remote handling (RH) port, it is probable that a failed TF Coil will be in one of these inconvenient locations. For this study, TF coil number 3 is assumed to fail and its replacement will be evaluated as a typical case. TF coil number 3 is located between a remote handling port ({number_sign}3) and a port allocated to the lower hybrid ({number_sign}4).

Not Available

1991-08-01T23:59:59.000Z

293

Organic agriculture cannot replace conventional agriculture  

E-Print Network [OSTI]

Organic agriculture cannot replace conventional agriculture Sina Adl , David Iron and Theodore Agriculture | Pathogen Dispersal Introduction Organic farming [1, 2] is gaining in popularity in Eu- rope, because or- ganic agriculture avoids using environmentally harmful chem- icals that pollute soil

Kolokolnikov, Theodore

294

Marin County- Wood Stove Replacement Rebate Program  

Broader source: Energy.gov [DOE]

The County of Marin has created a rebate program to encourage homeowners to remove or replace non-EPA certified wood-burning heaters (wood stoves and fireplace inserts) with cleaner burning stoves...

295

Beyond the Replacement Paradigm: Smart Lighting  

E-Print Network [OSTI]

Switches · Smart Building & Grid Interfaces · Efficient full spectrum LEDs without droop · Versatile, low - Visible Light Communications Integration of smart fixtures, networked sensors and control systemsBeyond the Replacement Paradigm: Smart Lighting Robert F. Karlicek, Jr. Director, Smart Lighting

Salama, Khaled

296

Grand Coulee Transmission Line Replacement Project  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

by the Bureau of Reclamation to design and construct six new 500-kV overhead transmission lines at Grand Coulee Dam. BPA will replace the existing underground transmission...

297

Evaluation of alternative sign replacement strategies  

E-Print Network [OSTI]

replacement procedure at the time the new standards go into effect. This will ensure that material, manpower, and other expenditures are minimized, resulting in an overall benefit to TXDOT. Based on this review and analysis, it is recommended that TXDOT...

McCaleb, James Bradley

1996-01-01T23:59:59.000Z

298

A replaceable reflective film for solar concentrators  

SciTech Connect (OSTI)

The 3M Company manufactures a silvered acrylic film called ECP-305 that is regarded as the preferred reflective film for use on stretched-membrane heliostats. However, ECP-305 will degrade in time, due to both corrosion of the silver layer and delamination at the film's silver-to-acrylic interface, and will eventually need to be replaced. 3M uses a very aggressive adhesive on this film, and once it is laminated, replacement is very difficult. The purpose of this investigation was the development of a replaceable reflector, a reflective film that can be easily removed and replaced. A replaceable reflector was successfully configured by laminating ECP-305 to the top surface of a smooth, dimensionally stable polymer film, with a removable adhesive applied to the underside of the polymer film. Several stages of screening and testing led to the selection of a 0.010-inch thick polycarbonate (GE 8030) as the best polymer film and a medium tack tape (3M Y-9425) was selected as the best removable adhesive. To demonstrate the feasibility of the replaceable reflector concept and to provide a real-time field test, the chosen construction was successfully applied to the 50-m{sup 2} SKI heliostat at the Central Receiver Test Facility at Sandia National Laboratories in Albuquerque. 4 refs., 13 figs., 7 tabs.

Not Available

1991-09-01T23:59:59.000Z

299

LONG TERM FILE MIGRATION - PART II: FILE REPLACEMENT ALGORITHMS  

E-Print Network [OSTI]

MIGRATION· PART II: FILE REPLACEMENT ALGORITHMS Alan Jaymay vary even though replacement fi~~d the pa~ameter value PIe N - P ;, RT I r:. fILE REPLACEMENT ALGORITHMS. I.lan ~1ar

Jay Smith, Alan

2011-01-01T23:59:59.000Z

300

REPLACEMENT/STALE DATED CHEQUE REQUEST FORM Date: ____________________________ Student Number: _________________________  

E-Print Network [OSTI]

REPLACEMENT/STALE DATED CHEQUE REQUEST FORM Date: ____________________________ Student: _________________________ Cheque Date: _____________________ CHEQUE AMOUNT: ________________________ REASON FOR REPLACEMENT Building at the address below. Please indicate how you would like to receive your replacement cheque

Sinnamon, Gordon J.

Note: This page contains sample records for the topic "replace permanent magnets" 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

Lambek Grammars, Tree Adjoining Grammars and Hyperedge Replacement Grammars  

E-Print Network [OSTI]

Lambek Grammars, Tree Adjoining Grammars and Hyperedge Replacement Grammars Richard Moot La (tree generating) hyperedge replacement grammars as an intermediate step. As a consequence both, using hyperedge replacement grammars as an intermediate step. 2 Tree Adjoining Grammars and Hyperedge

Paris-Sud XI, Université de

302

Quenching and Partitioning Process Development to Replace Hot...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

and Partitioning Process Development to Replace Hot Stamping of High-Strength Automotive Steel Quenching and Partitioning Process Development to Replace Hot Stamping of...

303

Magnesium Replacement of Aluminum Cast Components in a Production...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Magnesium Replacement of Aluminum Cast Components in a Production V6 Engine to Effect Cost-Effective Mass Reduction Magnesium Replacement of Aluminum Cast Components in a...

304

Effects of an Accelerated Diesel Engine Replacement/Retrofit Program  

E-Print Network [OSTI]

No. 894 Effects of an Accelerated Diesel Engine Replacement/2009 Effects of an Accelerated Diesel Engine Replacement/reductions occurring on an accelerated schedule compared to

Millstein, Dev E.; Harley, Robert A

2009-01-01T23:59:59.000Z

305

Avoiding a Train Wreck: Replacing Old Coal Plants with Energy...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Avoiding a Train Wreck: Replacing Old Coal Plants with Energy Efficiency, August 2011 Avoiding a Train Wreck: Replacing Old Coal Plants with Energy Efficiency, August 2011 This...

306

acuminata harbors permanent: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

magnetic poles, so of generation of magnetic elds in astrophysical objects (or in electrically conducting uids) constitutes Khesin, Boris A. 316 Random solids and random...

307

anteriors permanents tooth: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

magnetic poles, so of generation of magnetic elds in astrophysical objects (or in electrically conducting uids) constitutes Khesin, Boris A. 355 Random solids and random...

308

Valve assembly having remotely replaceable bearings  

DOE Patents [OSTI]

A valve assembly having remotely replaceable bearings is disclosed wherein a valve disc is supported within a flow duct for rotation about a pair of axially aligned bearings, one of which is carried by a spindle received within a diametral bore in the valve disc, and the other of which is carried by a bearing support block releasably mounted on the duct circumferentially of an annular collar on the valve disc coaxial with its diametrical bore. The spindle and bearing support block are adapted for remote removal to facilitate servicing or replacement of the valve disc support bearings.

Johnson, Evan R. (San Diego, CA); Tanner, David E. (Poway, CA)

1980-01-01T23:59:59.000Z

309

Interface structures in FePtFe3Pt hard-soft exchange-coupled magnetic nanocomposites  

E-Print Network [OSTI]

Interface structures in FePtĂ?Fe3Pt hard-soft exchange-coupled magnetic nanocomposites Jing Li with sizes 10 nm. This ensures the effective exchange coupling of magnetically hard and soft phases. High magnetic materials, the performance of conventional bulk permanent magnetic ma- terials is limited by its

Liu, J. Ping

310

Nuclear Magnetic Resonance: Portable and integrated Lead: P. Poulichet.  

E-Print Network [OSTI]

Nuclear Magnetic Resonance: Portable and integrated Lead: P. Poulichet. Permanent members: L. Rousseau, A. Fakri. Associated researchers: C. Delabie, A. Exertier. Portable Nuclear Magnetic Resonance : our work in the field of nuclear magneto resonance is focused on the design and the realization

Baudoin, Geneviève

311

MODELING OF EDDY CURRENT LOSS AND TEMPERATURE OF THE MAGNETS  

E-Print Network [OSTI]

the performance of the machine. This paper presents the modeling and analysis of eddy current loss in surfaceMODELING OF EDDY CURRENT LOSS AND TEMPERATURE OF THE MAGNETS IN PERMANENT MAGNET MACHINES ¤ XIAOFENG DING Electrical Engineering Department, Northwestern Polytechnical University, 127 Youyi Xilu #352

Mi, Chunting "Chris"

312

Forces on a magnet moving past figure-eight coils  

SciTech Connect (OSTI)

For the first time, the lift, drag, and guidance forces acting on a permanent magnet are measured as the magnet passes over different arrays of figure-eight (null-flux) coils. The experimental results are in good agreement with the predictions of dynamic circuit theory, which is used to explain more optimal coil arrays.

Mulcahy, T.H.; He, Jianliang; Rote, D.M. [Argonne National Lab., IL (United States); Rossing, T.D. [Northern Illinois Univ., De Kalb, IL (United States). Dept. of Physics

1993-03-01T23:59:59.000Z

313

Forces on a magnet moving past figure-eight coils  

SciTech Connect (OSTI)

For the first time, the lift, drag, and guidance forces acting on a permanent magnet are measured as the magnet passes over different arrays of figure-eight (null-flux) coils. The experimental results are in good agreement with the predictions of dynamic circuit theory, which is used to explain more optimal coil arrays.

Mulcahy, T.H.; He, Jianliang; Rote, D.M. (Argonne National Lab., IL (United States)); Rossing, T.D. (Northern Illinois Univ., De Kalb, IL (United States). Dept. of Physics)

1993-01-01T23:59:59.000Z

314

Magnetic switch for reactor control rod. [LMFBR  

DOE Patents [OSTI]

A magnetic reed switch assembly is described for activating an electromagnetic grapple utilized to hold a control rod in position above a reactor core. In normal operation the magnetic field of a permanent magnet is short-circuited by a magnetic shunt, diverting the magnetic field away from the reed switch. The magnetic shunt is made of a material having a Curie-point at the desired release temperature. Above that temperature the material loses its ferromagnetic properties, and the magnetic path is diverted to the reed switch which closes and short-circuits the control circuit for the control rod electro-magnetic grapple which allows the control rod to drop into the reactor core for controlling the reactivity of the core.

Germer, J.H.

1982-09-30T23:59:59.000Z

315

The Ringhals 2 steam generator replacement  

SciTech Connect (OSTI)

Righals 2, located on the west coast of Sweden and operated by Vattenfall (Swedish State Power), is a Westinghouse 800-MW three-loop pressurized water reactor that started commercial operation in 1975. In 1983, a task force was assigned to make a study of the steam generator (SG) tube corrosion problems, mainly stress corrosion cracking in the tubesheet area, which caused between two and three unscheduled outages each year. The task force study concluded that replacement was clearly the best of the three alternatives considered. Late in 1984, a decision was made to replace the SG in the summer of 1989. It was also decided to take advantage of existing margins in the plant by increasing the heat transfer area of the new SG. A power increase of 9% would then be possible by fairly moderate modifications of the turbine plant. The SG replacement project was on time, below budget, and much below dose budget. As a consequence of the 9% uprating, the cost of the SG replacement will be recovered after 3 to 4 yr.

Looft, H.

1990-06-01T23:59:59.000Z

316

Measure Guideline: Window Repair, Rehabilitation, and Replacement  

SciTech Connect (OSTI)

This measure guideline provides information and guidance on rehabilitating, retrofitting, and replacing existing window assemblies in residential construction. The intent is to provide information regarding means and methods to improve the energy and comfort performance of existing wood window assemblies in a way that takes into consideration component durability, in-service operation, and long term performance of the strategies.

Baker, P.

2012-12-01T23:59:59.000Z

317

Reversing Wolbachia-based population replacement  

E-Print Network [OSTI]

Wolbachia bacteria as a vehicle for population replace- ment. Also discussed are strategies strategies and provide mechan- isms for the autonomous spread of desired transgenes into the targeted relative to the natural population [15­17]. Primary candidates for gene-drive strategies are autonomous

Dobson, Stephen L.

318

REPLACE YOUR MERCURY THERMOMETERS BEFORE THEY BREAK!  

E-Print Network [OSTI]

REPLACE YOUR MERCURY THERMOMETERS BEFORE THEY BREAK! Did you know, mercury from broken thermometers to the local environment, if broken thermometers in sinks eventually end at the sanitary sewer plant. Broken mercury thermometers create hazardous waste that is costly to clean up and costly to dispose of. Other

319

THE GROWTH OF LIMITS OF VERTEX REPLACEMENT RULES  

E-Print Network [OSTI]

THE GROWTH OF LIMITS OF VERTEX REPLACEMENT RULES JOSEPH PREVITE, MICHELLE PREVITE, AND MARY a vertex replacement rule given by exactly one replacement graph generates an infinite graph for the growth degree of infinite graphs with polynomial growth that are gener- ated by vertex replacement rules

Previte, Joseph P.

320

Orthopaedic Surgery Center of Joint Preservation and Replacement  

E-Print Network [OSTI]

Orthopaedic Surgery Center of Joint Preservation and Replacement After Total Hip Replacement new hip! You are going home after a successful total hip replacement. Although there is still much. The benefits of a total hip replacement are great, but they do take a while to be realized. Hip Precautions

Oliver, Douglas L.

Note: This page contains sample records for the topic "replace permanent magnets" 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

Orthopaedic Surgery Center of Joint Preservation and Replacement  

E-Print Network [OSTI]

Orthopaedic Surgery Center of Joint Preservation and Replacement After Total Knee Replacement are going home after a successful total knee replacement. Although there is still much work to do, we have replacement are great, but they do take a while to be realized. We have put together some helpful hints

Oliver, Douglas L.

322

Permanent Closure of the TAN-664 Underground Storage Tank  

SciTech Connect (OSTI)

This closure package documents the site assessment and permanent closure of the TAN-664 gasoline underground storage tank in accordance with the regulatory requirements established in 40 CFR 280.71, 'Technical Standards and Corrective Action Requirements for Owners and Operators of Underground Storage Tanks: Out-of-Service UST Systems and Closure.'

Bradley K. Griffith

2011-12-01T23:59:59.000Z

323

Effect of Composition and Heat Treatment on MnBi Magnetic Materials...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Abstract: The metallic compound MnBi is a promising rare-earth-free permanent magnet material. Compare to other rare-earth-free candidates, MnBi stands out for its high...

324

Design of a High Performance Ferrite Magnet-Assisted Synchronous Reluctance Motor for an  

E-Print Network [OSTI]

Design of a High Performance Ferrite Magnet- Assisted Synchronous Reluctance Motor for an Electric) ferrite-based permanent magnet-assisted synchronous reluctance motor has been designed for an electric vehicle application. The design steps are outlined. Ferrite magnets have been chosen over conventional Nd

Paderborn, Universität

325

Nonlinear Dynamics of a Rotor Supported by Homopolar Magnetic Bearings with Saturation  

E-Print Network [OSTI]

magnetic bearing model. The nonlinear dynamics of permanent magnet-biased homopolar magnetic bearing (PMB HoMB) system with 2-dof rigid and 4-dof flexible rotor is analyzed. The dynamic behavior of the rotor-bearing system is examined in the feedback...

Kang, Kyungdae

2011-02-22T23:59:59.000Z

326

Tailoring magnetic properties of core/shell nanoparticles and Shouheng Sun  

E-Print Network [OSTI]

in electromagnetic and permanent magnetic applications.10,11 In such a system, the intimate contact be- tween the core and shell leads to effective exchange coupling and therefore cooperative magnetic switching coupled and magneti- zation of both core and shell reverses cooperatively. As a result, the magnetic

Liu, J. Ping

327

Underwater Explosive Shock Consolidation of Nanocomposite Pr2Fe14B/-Fe Magnetic Powders  

E-Print Network [OSTI]

performance permanent magnets has focused attention on exchange-coupled nanocomposites because of their low to fabricate exchange-coupled Pr2Fe14B/-Fe nanocomposite bulk magnets, using explosively generated shock waves, ensured exchange coupling between the hard and soft phases, resulting in magnetic properties better than

Liu, J. Ping

328

Bulk nanocomposite magnets produced by dynamic shock compaction K. H. Chen and Z. Q. Jin  

E-Print Network [OSTI]

single-phaselike behavior, indicating effective exchange coupling between hard and soft magnetic phases. © 2004 American Institute of Physics. DOI: 10.1063/1.1760834 The figure of merit for a permanent magnet of bulk exchange-coupled nanocomposite magnets still remains a great challenge. Shock compaction employs

Wang, Zhong L.

329

Explosive shock processing of Pr2Fe14B/ Fe exchange-coupled nanocomposite bulk magnets  

E-Print Network [OSTI]

Explosive shock processing of Pr2Fe14B/ ­Fe exchange-coupled nanocomposite bulk magnets Z.Q. Jin between neigh- boring magnetic phases.1,2 The prerequisite for effective exchange coupling is a small are usually used to produce single-phase microcrystalline permanent magnets, are not favored in making bulk

Liu, J. Ping

330

4f-local magnetic moments in the metals and alloys with SDW-instability  

E-Print Network [OSTI]

magnetic moments and itinerant electrons (RKKY-coupling) is modified by the additional coupling between-interac- tion but standard theory neglects the coupling between itinerant electrons, which leads to the magnetic electrons determines the type of magnetic order and AF structure wave vector Q for the local ( *) Permanent

Paris-Sud XI, Université de

331

Magnetic switch for reactor control rod  

DOE Patents [OSTI]

A magnetic reed switch assembly for activating an electromagnetic grapple utilized to hold a control rod in position above a reactor core. In normal operation the magnetic field of a permanent magnet is short-circuited by a magnetic shunt, diverting the magnetic field away from the reed switch. The magnetic shunt is made of a material having a Curie-point at the desired release temperature. Above that temperature the material loses its ferromagnetic properties, and the magnetic path is diverted to the reed switch which closes and short-circuits the control circuit for the control rod electromagnetic grapple which allows the control rod to drop into the reactor core for controlling the reactivity of the core.

Germer, John H. (San Jose, CA)

1986-01-01T23:59:59.000Z

332

An issue of permanence: assessing the effectiveness of temporary carbon storage  

E-Print Network [OSTI]

In this paper, we present a method to quantify the effectiveness of carbon mitigation options taking into account the "permanence" of the emissions reduction. While the issue of permanence is most commonly associated with ...

Herzog, Howard J.

333

Grain Refinement of Permanent Mold Cast Copper Base Alloys  

SciTech Connect (OSTI)

Grain refinement is a well established process for many cast and wrought alloys. The mechanical properties of various alloys could be enhanced by reducing the grain size. Refinement is also known to improve casting characteristics such as fluidity and hot tearing. Grain refinement of copper-base alloys is not widely used, especially in sand casting process. However, in permanent mold casting of copper alloys it is now common to use grain refinement to counteract the problem of severe hot tearing which also improves the pressure tightness of plumbing components. The mechanism of grain refinement in copper-base alloys is not well understood. The issues to be studied include the effect of minor alloy additions on the microstructure, their interaction with the grain refiner, effect of cooling rate, and loss of grain refinement (fading). In this investigation, efforts were made to explore and understand grain refinement of copper alloys, especially in permanent mold casting conditions.

M.Sadayappan; J.P.Thomson; M.Elboujdaini; G.Ping Gu; M. Sahoo

2005-04-01T23:59:59.000Z

334

Fundamental and Magnetic-Hardening Studies of Rare-Earth and Nanocomposite Magnets  

SciTech Connect (OSTI)

In this project we study new nanocrystalline and nanocomposite structures that have high potential for permanent-magnet development. These materials, which can be synthesized to have either very high or intermediate coercivities, have many applications in electric power, transportation, and information-storage industries. There is great interest in further development of understanding and application of these materials.

Sellmyer, David J.

2003-12-22T23:59:59.000Z

335

2.6 ELECTRIC AND MAGNETIC FIELDS Introduction  

E-Print Network [OSTI]

325 §2.6 ELECTRIC AND MAGNETIC FIELDS Introduction In electromagnetic theory the mks system MKS units Replacement symbol GAUSSIAN units E (Electric field) volt/m E statvolt/cm B (Magnetic field gauss-cm V (Electric potential) volt V statvolt (Dielectric constant) 4 µ (Magnetic permeability) 4µ c2

California at Santa Cruz, University of

336

Abstract -This paper presents a methodology and a tool for the coupled magnetic-structural with semi-analytical models. For this  

E-Print Network [OSTI]

Abstract - This paper presents a methodology and a tool for the coupled magnetic-structural with semi-analytical models. For this coupling, the magnetic model is available; we developed the structural MODEL Magnetic fields radiated by permanent magnets and conductors are computed through Coulombian

Boyer, Edmond

337

A new approach for improving exchange-spring magnets J. S. Jiang, J. E. Pearson, Z. Y. Liu, B. Kabius, S. Trasobares, D. J. Miller, and  

E-Print Network [OSTI]

The exchange­spring principle1 identifies a route for cre- ating high-performance permanent magnets from­spring magnet, nano-scale hard and soft magnetic phases are coupled via interfacial exchange interaction coupling due to the grain boundary phase also led to the notion that optimal exchange­ spring magnets

Liu, J. Ping

338

Arizona: Solar Panels Replace Inefficient Fossil Fuel-Powered...  

Energy Savers [EERE]

Arizona: Solar Panels Replace Inefficient Fossil Fuel-Powered Energy Systems Arizona: Solar Panels Replace Inefficient Fossil Fuel-Powered Energy Systems May 1, 2014 - 9:33am...

339

Electrical Equipment Replacement: Energy Efficiency versus System Compatibility  

E-Print Network [OSTI]

end users to select the most energy efficient equipment when replacing motors, motor drives, transformers, lamps, ballasts, etc., given costs associated with energy consumption when compared with installation. The selection of replacement parts...

Massey, G. W.

2005-01-01T23:59:59.000Z

340

Replaces DOE F 5120.2  

Energy Savers [EERE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of Inspector GeneralDepartment of Energy fromComments on NBPSitingPresentationEnergyReplacement of50.2700.2

Note: This page contains sample records for the topic "replace permanent magnets" 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

Replacing PG and E's Milpitas terminal  

SciTech Connect (OSTI)

This paper reports that Pacific Gas and Electric Co.'s Milpitas Terminal was originally built in 1929, when natural gas was first brought to the San Francisco Bay Area from the Kettleman Hills gas fields. This paper reports that in 1985, a project was begun to replace the old terminal due to maintenance problems, odor complaints and unaccounted-for gas due to poor measurement quality. The location of the terminal was also a problem. A proposed highway expansion would encroach into the yard area where the existing pipeline was located. In addition, the original location was in agricultural lands, which was changing to commercial use.

Rawcliffe, R.S.; Maceyka, R.A. (Pacific Gas and Electric Co., San Francisco, CA (US))

1991-07-01T23:59:59.000Z

342

Magnetically driven quantum heat engine  

E-Print Network [OSTI]

We studied the efficiency of two different schemes for a magnetically driven quantum heat engine, by considering as the working substance a single nonrelativistic particle trapped in a cylindrical potential well, in the presence of an external magnetic field. The first scheme is a cycle, composed of two adiabatic and two isoenergetic reversible trajectories in configuration space. The trajectories are driven by a quasistatic modulation of the external magnetic-field intensity. The second scheme is a variant of the former, where the isoenergetic trajectories are replaced by isothermal ones, along which the system is in contact with macroscopic thermostats. This second scheme constitutes a quantum analog of the classical Carnot cycle.

Enrique Muńoz; Francisco J. Peńa

2014-05-12T23:59:59.000Z

343

Text-Alternative Version: LED Replacements for Linear Fluorescent Lamps  

Broader source: Energy.gov [DOE]

Below is the text-alternative version of the "LED Replacements for Linear Fluorescent Lamps" webcast, held June 20, 2011.

344

The opportunistic replacement problem: analysis and case studies  

E-Print Network [OSTI]

Jan 22, 2009 ... Abstract: We consider an optimization model for determining optimal opportunistic maintenance (that is, component replacement) schedules ...

Torgny Almgren

2009-01-22T23:59:59.000Z

345

Computer Replacement Guidelines Environmental Health and Safety, Stanford University  

E-Print Network [OSTI]

Computer Replacement Guidelines Environmental Health and Safety, Stanford University 17 November 2005 This document describes the guidelines for replacing laptop and desktop computers at Environmental Health and Safety. PC laptop and desktop computers will be replaced a) on an ongoing basis where

346

Inference of Edge Replacement Graph Grammars Jacek P. Kukluk1  

E-Print Network [OSTI]

Inference of Edge Replacement Graph Grammars Jacek P. Kukluk1 , Lawrence B. Holder2 , and Diane J@eecs.wsu.edu Abstract We describe an algorithm and experiments for inference of edge replacement graph grammars for inference of Node Replacement Recursive Graph Grammars [7]. In this paper we describe an approach

Holder, Lawrence B.

347

FUNCTIONAL ESTIMATION FOR A MULTICOMPONENT AGE REPLACEMENT MODEL  

E-Print Network [OSTI]

1 FUNCTIONAL ESTIMATION FOR A MULTICOMPONENT AGE REPLACEMENT MODEL Pierre L'Ecuyer, Benoit Martin, controlled by a replacement rule based on age thresholds. We show how to estimate the expected cost­ generative simulation, maintenance models, age replacement policies. #12; 2 L'ECUYER, MARTIN, AND V ' AZQUEZ

L'Ecuyer, Pierre

348

1 INTRODUCTION The replacement investment decision is clearly a  

E-Print Network [OSTI]

1 INTRODUCTION The replacement investment decision is clearly a strategic objective of a company for the replacement decision largely depends on the company context. However, we can summarize the motivations leading over time and prove that the replacement policy at equal intervals is optimum. However, the linear

Paris-Sud XI, Université de

349

Application for Amendment 80 Vessel Replacement Page 1 of 6  

E-Print Network [OSTI]

Application for Amendment 80 Vessel Replacement Page 1 of 6 Revised: 12/23/2013 OMB Control No. 0648-0565 Expiration Date: 01/31/2016 APPLICATION FOR AMENDMENT 80 VESSEL REPLACEMENT United States OF THE AMENDMENT 80 VESSEL BEING REPLACED 1. Vessel Name: 2. ADF&G Vessel Registration No.: 3. USCG Documentation

350

Page Replacement and Reference Bit Emulation in Mach  

E-Print Network [OSTI]

Page Replacement and Reference Bit Emulation in Mach Richard P. Draves rpd@cs.cmu.edu School of Computer Science Carnegie Mellon University 5000 Forbes Avenue Pittsburgh, PA 15213 Abstract A page­replacement in software. This paper describes the Mach kernel's page­replacement algorithm and considers three software

351

The Cosmic Origins Spectrograph: A Hubble Replacement Instrument  

E-Print Network [OSTI]

The Cosmic Origins Spectrograph: A Hubble Replacement Instrument for the 2002 Reservicing Mission Origins Spectrograph (COS) has recently been selected as a replacement instrument for the Hubble Space Telescope. Installation is scheduled for late 2002, replacing COSTAR, which at that time will be unnecessary

Colorado at Boulder, University of

352

Diploma Replacement Request FOR REGISTRAR'S OFFICE USE ONLY  

E-Print Network [OSTI]

Diploma Replacement Request FOR REGISTRAR'S OFFICE USE ONLY Updated: 08/26/09 Use this form to request a replacement or additional diploma. · The name on your diploma must be the same the Registrar's Office, Registration and Records Division prior to requesting your replacement diploma

Feschotte, Cedric

353

Cache Replacement Policy Using Map-based Adaptive Insertion  

E-Print Network [OSTI]

Cache Replacement Policy Using Map-based Adaptive Insertion Yasuo Ishii The University of Tokyo insertion policy (MAIP) for a novel cache replacement. The MAIP estimates the data reuse possibility policy. 1. INTRODUCTION The cache replacement policy plays an important role in improving system

Paris-Sud XI, Université de

354

University of Utah Payroll Department Stop Payment -Replacement Form  

E-Print Network [OSTI]

University of Utah Payroll Department Stop Payment - Replacement Form Affidavit to request replacement of a lost, stolen, or damaged, payroll check. Please note that it takes 5 to 7 days to process is given to induce a replacement check for one originally issued. 3. I agree to indemnify and hold

Provancher, William

355

FUNCTIONAL ESTIMATION FOR A MULTICOMPONENT AGE REPLACEMENT MODEL  

E-Print Network [OSTI]

FUNCTIONAL ESTIMATION FOR A MULTICOMPONENT AGE REPLACEMENT MODEL Pierre L'Ecuyer, Benoit Martin, controlled by a replacement rule based on age thresholds. We show how to estimate the expected cost­ generative simulation, maintenance models, age replacement policies. #12; L'ECUYER, MARTIN, AND V ' AZQUEZ

Vázquez-Abad, Felisa J.

356

Node discovery and replacement using mobile Kalypso Magklara1  

E-Print Network [OSTI]

Node discovery and replacement using mobile robot Kalypso Magklara1 , Dimitrios Zorbas1 and Tahiry, that discovers the nodes around it and replaces the active nodes, whose energy is drained, by fully charged and that decide, which nodes to replace. We simulate our algorithms and our findings show that all nodes that fail

Paris-Sud XI, Université de

357

REPLACEMENT DIPLOMA ORDER FORM BOISE STATE REGISTRAR'S OFFICE  

E-Print Network [OSTI]

REPLACEMENT DIPLOMA ORDER FORM BOISE STATE REGISTRAR'S OFFICE Administration Building, Room 110-3169 The replacement diploma will bear the signatures of the current University President and Registrar and have the words Replacement Diploma printed under the university seal. Allow 3-4 weeks for delivery. You

Barrash, Warren

358

Record Ferromagnetic Exchange through Cyanide and Elucidation of the Magnetic Phase Diagram for a CuII  

E-Print Network [OSTI]

decades.2-4 Indeed, these recent efforts have already resulted in low-density permanent magnets that order strength in magnetic materials, the compounds displaying the strongest coupling University of CaliforniaRecord Ferromagnetic Exchange through Cyanide and Elucidation of the Magnetic Phase Diagram

359

Application for Replacement JCU Award (Certificate/Testamur) -FM-EX-VApr2012 REQUEST FOR REPLACEMENT JCU AWARD  

E-Print Network [OSTI]

Application for Replacement JCU Award (Certificate/Testamur) - FM-EX-VApr2012 REQUEST FOR REPLACEMENT JCU AWARD (CERTIFICATE/TESTAMUR) 1. PERSONAL DETAILS JCU Student Number (8 digits): Title: rDr r after the fee is paid. · Replacement Testamurs - $70 (Diploma, Bachelor, Master and Doctoral

360

CX-007727: Categorical Exclusion Determination | Department of...  

Broader source: Energy.gov (indexed) [DOE]

support the development of manganese-aluminum bulk powder capable of replacing rare earth elements in permanent magnets that are used in wind turbine generators and electric...

Note: This page contains sample records for the topic "replace permanent magnets" 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

CX-007722: Categorical Exclusion Determination | Department of...  

Broader source: Energy.gov (indexed) [DOE]

will support the development of iron nitride bulk powder capable of replacing rare earth elements in permanent magnets that are used in wind turbine generators and electric...

362

SOLAR MAGNETIC TRACKING. IV. THE DEATH OF MAGNETIC FEATURES  

SciTech Connect (OSTI)

The removal of magnetic flux from the quiet-Sun photosphere is important for maintaining the statistical steady state of the magnetic field there, for determining the magnetic flux budget of the Sun, and for estimating the rate of energy injected into the upper solar atmosphere. Magnetic feature death is a measurable proxy for the removal of detectable flux, either by cancellation (submerging or rising loops, or reconnection in the photosphere) or by dispersal of flux. We used the SWAMIS feature tracking code to understand how nearly 2 Multiplication-Sign 10{sup 4} magnetic features die in an hour-long sequence of Hinode/SOT/NFI magnetograms of a region of the quiet Sun. Of the feature deaths that remove visible magnetic flux from the photosphere, the vast majority do so by a process that merely disperses the previously detected flux so that it is too small and too weak to be detected, rather than completely eliminating it. The behavior of the ensemble average of these dispersals is not consistent with a model of simple planar diffusion, suggesting that the dispersal is constrained by the evolving photospheric velocity field. We introduce the concept of the partial lifetime of magnetic features, and show that the partial lifetime due to Cancellation of magnetic flux, 22 hr, is three times slower than previous measurements of the flux turnover time. This indicates that prior feature-based estimates of the flux replacement time may be too short, in contrast with the tendency for this quantity to decrease as resolution and instrumentation have improved. This suggests that dispersal of flux to smaller scales is more important for the replacement of magnetic fields in the quiet Sun than observed bipolar cancellation. We conclude that processes on spatial scales smaller than those visible to Hinode dominate the processes of flux emergence and cancellation, and therefore also the quantity of magnetic flux that threads the photosphere.

Lamb, D. A.; Howard, T. A.; DeForest, C. E. [Southwest Research Institute, 1050 Walnut Street, Suite 300, Boulder, CO 80302 (United States); Parnell, C. E. [School of Mathematics and Statistics, University of St. Andrews, St. Andrews, KY16 9SS (United Kingdom); Welsch, B. T., E-mail: derek@boulder.swri.edu [Space Sciences Laboratory, University of California-Berkeley, 7 Gauss Way, Berkeley, CA 94720 (United States)

2013-09-10T23:59:59.000Z

363

Two Permanently Congruent Rods May Have Different Proper Lengths  

E-Print Network [OSTI]

We scrutinize congruence as one of the basic definitions of equality in geometry and pit it against physics of Special Relativity. We show that two non-rigid rods permanently kept congruent during their common expansion or compression may have different instantaneous proper lengths (when measured at the same time of their respective reference clocks) if they have different mass distributions over their lengths. Alternatively, their proper lengths can come out equal only when measured at different but strictly correlated moments of time of their respective clocks. The derived expression for the ratio of instantaneous proper lengths of two permanently congruent changing objects explicitly contains information about the objects mass distribution. The same is true for the ratio of readings of the two reference clocks, for which the instantaneous measurements of respective proper lengths produce the same result. In either case the characteristics usually considered as purely kinematic depend on mass distribution, which is a dynamic property. This is a spectacular demonstration of dynamic aspect of geometry already in the framework of Special Relativity.

Moses Fayngold

2008-07-06T23:59:59.000Z

364

Application Form for Replacement Diploma/Program Certificate (Form must be notarized)  

E-Print Network [OSTI]

Application Form for Replacement Diploma/Program Certificate (Form must be notarized) Complete to Princeton University as follows: Replacement Diploma - $75 Replacement Program Certificate - $30 Please

365

A fully-integrated multi-watt permanent-magnet turbine generator  

E-Print Network [OSTI]

The energy density available from batteries is increasingly becoming a limiting factor in the capabilities of portable electronics. As a result, there is a growing need for compact, high energy density sources. This thesis ...

Yen, Bernard Chih-Hsun, 1981-

2008-01-01T23:59:59.000Z

366

Co-Simulation of an Interior Permanent Magnet Synchronous Motor with Segmented Rotor Structure  

E-Print Network [OSTI]

Christoph Schulte and Joachim B¨ocker Power Electronics and Electrical Drives, Paderborn University, D-33095 Paderborn, Germany schulte@lea.upb.de, boecker@lea.upb.de Abstract--Accurate simulation of electric drives, electrical drive, multi-slice approach I. INTRODUCTION Conventionally, a two-step process is being used

Paderborn, Universität

367

Computer Based Motor Parameter Determination for High Speed Operation of Permanent Magnet Synchronous Machines  

E-Print Network [OSTI]

Synchronous Machines B. Szabados and U. Schaible McMaster University 1280 Main St. W., Hamilton, Ontario PM synchronous machine parameters in the high speed operating range. The theory and real interior PM synchronous machine at up to 8000 rpm. Results are presented which show a significant variation

Szabados, Barna

368

ULTRAMINIATURIZED MILLIWATT-SCALE PERMANENT MAGNET GENERATORS F. Herrault1,2  

E-Print Network [OSTI]

to minimize corrosion. A 10-µm thick nickel coating layer is then deposited by electroless plating to act

369

Operational behavior of a double-fed permanent magnet generator for wind turbines  

E-Print Network [OSTI]

Greater efficiency in wind turbine systems is achieved by allowing the rotor to change its rate of rotation as the wind speed changes. The wind turbine system is decoupled from the utility grid and a variable speed operation ...

Reddy, Sivananda Kumjula

2005-01-01T23:59:59.000Z

370

Permanent-Magnet Adjustable-Speed Motors John S . Hsu (Htsui...  

Office of Scientific and Technical Information (OSTI)

Scudiere, Laura D. Marlino, Donald J. Adams, Pragasen Pillay Senior Member Senior Member Oak Ridge National Laboratory Oak Ridge, TN 37831-7280 P.O. BOX 2003, K-1220, MS 7280...

371

The use of a permanent magnet for water content measurements of wood chips  

E-Print Network [OSTI]

making machine. The black liquor left over from the pulpingchips, brownstock, and black liquor. This report describes acellulose and water) and black liquor using the bench scale

2001-01-01T23:59:59.000Z

372

INTERMAG 2006 597 Multiwatt Microscale Permanent-Magnet Generators Operating at High Temperatures.  

E-Print Network [OSTI]

was employed to selectively heat the stator and the rotor. Fig. 3 presents DC output power to an external load an approximately 50% drop at 200°C (4 Watts of DC power capability across resistive load). Fig. 4 shows calculated-to-electrical gen- erators as an essential component of heat-engine-driven electrical power sources for portable

373

Synthesis and Characterization of Metal-Oxide Composite Materials for Permanent Magnetic Applications  

E-Print Network [OSTI]

supply of crucial rare-earth elements is uncertain, causingheavily on the use of rare earth elements. China, whichworld’s supply of rare-earth elements, has cut down exports

Volodchenkov, Aleksey

2012-01-01T23:59:59.000Z

374

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

E-Print Network [OSTI]

Page 5-17 (From top to bottom) Phase A current (DSP)-[1V/div], q-axis and d-axis currents-[1V/div] when motor speed is changed from 130RPM to 10RPM and back to 130RPM... torque at standstill (i.e., zero speed) and low speeds as well as constant output power over wide speed range. In order to meet these requirements, the PMa-SynRM machines are designed to operate not only in the constant torque region where the motor...

Chakali, Anil K.

2011-02-22T23:59:59.000Z

375

The use of a permanent magnet for water content measurements of wood chips  

E-Print Network [OSTI]

Diagram of a Wood Chip Moisture Content Measurement DeviceMeasurement of Moisture Content in Wood Chips Using NMR andWood chip water-content tests were done over a broad range of moisture contents

2001-01-01T23:59:59.000Z

376

ACTIVE SUSPENSION CONTROL WITH DIRECT-DRIVE TUBULAR LINEAR BRUSHLESS PERMANENT-MAGNET MOTOR  

E-Print Network [OSTI]

-bit A/D channels, four 12-bit A/D channels, eight 16-bit D/A channels. The software used for the actual implementation is Control Desk Developer Version 2.1.1, which connected with Matlab 6.1.0.450 (R12.1) Simulink. This developmental environment... the quarter-car test bed is under closed-loop control, the LBPMM generates the force to attenuate road disturbance, which results in the current flow in each coil set as shown in Figure 9. The current flow in each coil set is monitored from the Control Desk...

Lee, Seungho

2010-01-16T23:59:59.000Z

377

PERMANENT MAGNETS UNDER IRRADIATION AND RADIOACTIVE ALKALI ION BEAM DEVELOPMENT FOR SPIRAL 1  

E-Print Network [OSTI]

produced by nuclear reactions are released from the high temperature target (2000°C), effuse through a cold transfer tube up to a multi-charged ECR ion source. After extraction from the ECRIS at low energy ( 34 q of high-energy fragmentation as well as the ISOL methods for exploring the structure of nuclei far from

Boyer, Edmond

378

Direct - drive permanent magnet synchronous generator design for hydrokinetic energy extraction .  

E-Print Network [OSTI]

??"Hydrokinetic turbines deliver lower shaft speeds when compared to both steam and wind turbines. Hence, a water wheel generator must operate at speeds as low… (more)

Kashyap, Amshumaan Raghunatha

2013-01-01T23:59:59.000Z

379

Novel Manufacturing Technologies for High Power Induction and Permanent Magnet Electric Motors (Agreement ID:23726)  

Broader source: Energy.gov [DOE]

2013 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting

380

Rough Design of a Double-Stator Axial Flux Permanent Magnet Generator  

E-Print Network [OSTI]

developed MCTs [2]. However, because of tides low speed and to avoid blades cavitation, the turbine Current Turbine Sofiane Djebarri1 , Jean Frédéric Charpentier1 , Franck Scuiller1 , Mohamed Benbouzid2 (DSAFPM) for a rim-driven Marine Current Turbine (MCT). The DSAFPM machine will be compared

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "replace permanent magnets" 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

Novel design and implementation of a permanent magnet linear tubular generator for ocean wave energy conversion.  

E-Print Network [OSTI]

??The world’s energy consumption is growing at an alarming rate and the need for renewable energy is apparent now more than ever. Estimates have shown… (more)

Prudell, Joseph H.

2007-01-01T23:59:59.000Z

382

Novel control of a permanent magnet linear generator for ocean wave energy applications.  

E-Print Network [OSTI]

??Wave energy conversion devices are a rapidly growing interest worldwide for the potential to harness a sustainable and renewable energy source. Due to the oscillatory… (more)

VanderMeulen, Aaron H.

2007-01-01T23:59:59.000Z

383

Testing, Analysis, and Model Verification of Miniature Linear Permanent Magnet Generators.  

E-Print Network [OSTI]

??The military has become increasingly dependent on mobile electronic equipment to ensure success and safety of soldiers in remote locations. To operate the electronics, soldiers… (more)

Rippee, Michael Ray

2012-01-01T23:59:59.000Z

384

Radiation-Induced Demagnetization of Nd-Fe-B Permanent Magnets  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -the Mid-Infrared at 278, 298, and 323 RS-PO-0001-001.docW.Radiation

385

"Permanent Magnet Generator-like AC Current Drive for Torroidal Fusion  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNG IHDR€ÍSolar Energy SystemsFebruary 7-8,MarchKnyszek,A.|

386

Current Drive for Plasma Via Vertically-Structured Permanent Magnet System.  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation Proposed Newcatalyst phases onOrganization FY 2012 FY 2013 FY 2014| Princeton Plasma Physics

387

Monitoring Critical Temperatures in Permanent Magnet Synchronous Motors Using Low-Order  

E-Print Network [OSTI]

systems. The model performances are validated by extensive experimental results based on a high-speed PMSM

Paderborn, Universität

388

A Comparative Study of Two Predictive Current Controls for a Permanent Magnet Synchronous  

E-Print Network [OSTI]

Machines (PMSM) drives. The first tested control scheme is based on a model including the inverter and the PMSM and taking into account the discrete nature of the inverter leg states. It predicts the future time. The second tested control scheme uses a model of the PMSM to predict the output voltages which

Paris-Sud XI, Université de

389

Direct Torque Control for Interior Permanent Magnet Synchronous Motors with Respect to Optimal Efficiency  

E-Print Network [OSTI]

motors (PMSM) increased significantly. Thus, this motor type becomes more and more attractive for drive-axis current of the motor must not be controlled to zero, as it is common with non-salient PMSM. Thus

Paderborn, Universität

390

Abstract --This paper presents a theoretical approach as far as faulty Permanent Magnet Synchronous Machines  

E-Print Network [OSTI]

Synchronous Machines (PMSM) are concerned. The knowledge of PMSM's behavior under inter-turn fault is very detection often require faulty models. The aim of this paper is to develop a dynamical model of a PMSM under into account of different winding distributions. I. INTRODUCTION One way to study PMSM under inter-turn short

Paris-Sud XI, Université de

391

Noise reduction control strategy of a permanent magnet synchronous machine for vehicle applications  

E-Print Network [OSTI]

Figure 2.1 Single Pole of a Ten Pole PMSM Similar to the Investigated Machine............................................................................................. 13 Figure 2.2 Use of Available Parameters to Build a Triangle Based... prevalence of the PMSM as the machine of choice for traction motor applications, the author chose to research a topic which concentrated on this machine and its corresponding ASD platform. Through previous coursework, the author has learned...

Doolittle, Randy Gene

2009-05-15T23:59:59.000Z

392

Digital lock-in detection of site-specific magnetism in magnetic materials  

DOE Patents [OSTI]

The polarization and diffraction characteristics of x-rays incident upon a magnetic material are manipulated to provide a desired magnetic sensitivity in the material. The contrast in diffracted intensity of opposite helicities of circularly polarized x-rays is measured to permit separation of magnetic signals by element type and by atomic environment. This allows for the direct probing of magnetic signals from elements of the same species in nonequivalent atomic environments to better understand the behavior and characteristics of permanent magnetic materials. By using known crystallographic information together with manipulation of the polarization of x-rays having energies tuned near element-specific electronic excitations and by detecting and comparing the incident and diffracted photons at the same frequency, more accurate magnetic measurements can be made over shorter observation periods.

Haskel, Daniel (Naperville, IL); Lang, Jonathan C. (Naperville, IL); Srajer, George (Oak Park, IL)

2008-07-22T23:59:59.000Z

393

Magnetic levitation system for moving objects  

DOE Patents [OSTI]

Repelling magnetic forces are produced by the interaction of a flux-concentrated magnetic field (produced by permanent magnets or electromagnets) with an inductively loaded closed electric circuit. When one such element moves with respect to the other, a current is induced in the circuit. This current then interacts back on the field to produce a repelling force. These repelling magnetic forces are applied to magnetically levitate a moving object such as a train car. The power required to levitate a train of such cars is drawn from the motional energy of the train itself, and typically represents only a percent or two of the several megawatts of power required to overcome aerodynamic drag at high speeds. 7 figs.

Post, R.F.

1998-03-03T23:59:59.000Z

394

Magnetic levitation system for moving objects  

DOE Patents [OSTI]

Repelling magnetic forces are produced by the interaction of a flux-concentrated magnetic field (produced by permanent magnets or electromagnets) with an inductively loaded closed electric circuit. When one such element moves with respect to the other, a current is induced in the circuit. This current then interacts back on the field to produce a repelling force. These repelling magnetic forces are applied to magnetically levitate a moving object such as a train car. The power required to levitate a train of such cars is drawn from the motional energy of the train itself, and typically represents only a percent or two of the several megawatts of power required to overcome aerodynamic drag at high speeds.

Post, Richard F. (Walnut Creek, CA)

1998-01-01T23:59:59.000Z

395

Replacement of the Advanced Test Reactor control room  

SciTech Connect (OSTI)

The control room for the Advanced Test Reactor has been replaced to provide modern equipment utilizing current standards and meeting the current human factors requirements. The control room was designed in the early 1960 era and had not been significantly upgraded since the initial installation. The replacement did not change any of the safety circuits or equipment but did result in replacement of some of the recorders that display information from the safety systems. The replacement was completed in concert with the replacement of the control room simulator which provided important feedback on the design. The design successfully incorporates computer-based systems into the display of the plant variables. This improved design provides the operator with more information in a more usable form than was provided by the original design. The replacement was successfully completed within the scheduled time thereby minimizing the down time for the reactor. 1 fig., 1 tab.

Durney, J.L.; Klingler, W.B. (EG and G Idaho, Inc., Idaho Falls, ID (USA))

1989-01-01T23:59:59.000Z

396

A planar ion trap chip with integrated structures for an adjustable magnetic field gradient  

E-Print Network [OSTI]

field necessary for magnetic-gradient- induced coupling between ionic effective spins. We dem- onstrate] magnetic field gradient, however, such coupling is induced. Also, coupling between spin states of different-gradient- induced coupling (MAGIC). A static gradient can be generated by permanent mag- nets [15, 16] or by current

Wunderlich, Christof

397

Magnet options for sensors for the pulp and paper industry  

SciTech Connect (OSTI)

The Lawrence Berkeley National Laboratory (LBNL) has been developing sensors for the pulp and paper industry that uses a magnetic field. The applications for magnetic sensors that have studied include (1) sensors for the measurement of the water and ice content of wood chips entering the pulping mill, (2) sensors for measuring the water content and other constituents of the black liquor leaving the paper digester, and (3) sensors for measuring paper thickness and water content as the paper is being processed. These tasks can be done using nuclear magnetic resonance (NMR). The magnetic field used for doing the NMR can come from either permanent magnets or superconducting magnets. The choice of the magnet is dependent on a number of factors, which include the size of the sample and field strength needed to do the sensing task at hand. This paper describes some superconducting magnet options that can be used in the pulp and paper industry.

Green, M.A.; Barale, P.J.; Fong, C.G.; Luft, P.A.; Reimer, J.A.; Yahnke, M.S.

2001-05-05T23:59:59.000Z

398

E-Print Network 3.0 - adjustable permanent quadrupoles Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

developed on a dedicated beam line at RARAF... . The permanent quadrupole lenses (STI Optronics, Inc., Bellevue, WA) form a double triplet Russian quadrupole... by a fine...

399

Magnetic changes observed in a solar flare  

SciTech Connect (OSTI)

We present observations of a fairly large impulsive flare (1B/M4, starting 17:22 UT, 1980 April 10). Observations of the microwave/hard X-ray burst show the time development of the impulsive energy release. Chromospheric (H..cap alpha..) and photospheric (Fe I lambda5324) filtergrams and photospheric (Fe I lambda8688) magnetograms, intensitygrams, and velocitygrams show magnetic strucutre, flare emission, mass motion, and magnetic changes. From these observations, we conclude: 1. The flare was triggered by a small emerging magnetic bipole. 2. The peak impulsive energy release occurred in the explosive eruption of a filament from over the magnetic inversion line. Hence: a) The filament eruption was the magnetic transient in the heart of the primary energy release in the chromosphere and corona. b) The primary energy release did not occur in approximately stationary magnetic loops, but on field lines undergoing violet motion and drastic changes in direction. 3. In the photospheric magnetograph lines. Fe I lambda5324 and Fe I lambda8688, the impulsive peak of the flare produced emission in a unipolar area of a sunspot. In synchrony with the emission, the polarity of this area transiently reversed in the lambda8688 magnetigrams; apparently, this was an artifact of the line emission. 4. Within a few minutes after the explosive filament eruption. a) A permanent decrease in magnetic flux accompanied the truncation of an umbra. b) A permanent increase in magnetic flux accompanied the severance of the penumbral bridge to a satellite sunspot. Apparently, thee genuine photospheric magnetic changes were consequences of strong flare-wrought magnetic changes in the chromospher and corona.

Moore, R.L.; Hurford, G.J.; Jones, H.P.; Kane, S.R.

1984-01-01T23:59:59.000Z

400

arthroplasty replacement: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Replacement of the target module was accomplished using only remote handling tooling and procedures (hands meter of high density concrete The Target Service Bay is...

Note: This page contains sample records for the topic "replace permanent magnets" 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

androgen replacement therapy: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

gains, replacement components are typically more energy efficient than older equipment. Life cycle cost analyses encourage... Massey, G. W. 2005-01-01 153 LATTICE PATHS, SAMPLING...

402

arthroplasty replacement hip: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

gains, replacement components are typically more energy efficient than older equipment. Life cycle cost analyses encourage... Massey, G. W. 2005-01-01 144 LATTICE PATHS, SAMPLING...

403

EA-1994: Malheur Resource Area Jonesboro Diversion Dam Replacement...  

Broader source: Energy.gov (indexed) [DOE]

Burns Paiute Tribe for replacement of an existing diversion dam and installation of a fish passage structure. BPA's proposed action was to fund the project. PUBLIC COMMENT...

404

Heavy-Duty Natural Gas Drayage Truck Replacement Program  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Heavy-Duty Natural Gas Drayage Truck Replacement Program Principal Investigator: Vicki White South Coast Air Quality Management District May 16, 2012 Project ID ARRAVT045 This...

405

New Feedstocks and Replacement Fuels - Future Energy for Mobility...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Fuels - Future Energy for Mobility New Feedstocks and Replacement Fuels - Future Energy for Mobility Presentation given at DEER 2006, August 20-24, 2006, Detroit, Michigan....

406

New Feedstocks and Replacement Fuel Diesel Engine Challenges...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Fuel Diesel Engine Challenges New Feedstocks and Replacement Fuel Diesel Engine Challenges Presentation given at DEER 2006, August 20-24, 2006, Detroit, Michigan. Sponsored by the...

407

Quenching and Partitioning Process Development to Replace Hot...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Quenching and Partitioning Process ADVANCED MANUFACTURING OFFICE Quenching and Partitioning Process Development to Replace Hot Stamping of High-Strength Automotive Steel Novel...

408

FORMATION OF REPLACEMENT DOLOMITE IN THE LATEMAR CARBONATE BUILDUP, DOLOMITES, NORTHERN ITALY: PART 1.  

E-Print Network [OSTI]

FORMATION OF REPLACEMENT DOLOMITE IN THE LATEMAR CARBONATE BUILDUP, DOLOMITES, NORTHERN ITALY: PART F. McDONOUGH*** ABSTRACT. Replacement dolomite in the Latemar carbonate buildup, northern Italy of vertical columns (replacement of limestone breccia pipes) and sheets (replacement along fractures

Carmichael, Sarah

409

(1) Frank May REU Summary 2012 -http://engineering.umass.edu/reu/2012/reu-students (2) "Hard Magnetic Materials: A Perspecitve" J.M.D. Coey  

E-Print Network [OSTI]

(1) Frank May REU Summary 2012 - http://engineering.umass.edu/reu/2012/reu-students (2) "Hard Magnetic Materials: A Perspecitve" J.M.D. Coey (3) "Perspecitve on Permanent Magnetic Materials for Energy of L10 magnetic materials" David E. Laughlin, Kumar Srinivasan, Mihaela Tanase, Lisha Wang (5) "A study

Mountziaris, T. J.

410

Shock compression response of magnetic nanocomposite powders Z.Q. Jin a,b,*, K.H. Chen a,b  

E-Print Network [OSTI]

characteristics, correspondingly, the best magnetic properties with strongest exchange coupling between hard]. These values are about twice that of commercially available anisotropic permanent magnets ($400 kJ/m3 ). Of parShock compression response of magnetic nanocomposite powders Z.Q. Jin a,b,*, K.H. Chen a,b , J. Li

Wang, Zhong L.

411

Controlled interface profile in SmCo/Fe exchange-spring magnets Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439  

E-Print Network [OSTI]

-spring permanent magnets enhances the exchange coupling effectiveness without modifying the local composition are complementary or even mutually exclusive. Exchange-spring nanocomposite magnets1,2 consist of exchange coupled of the exchange-spring magnets. For example, interfacial condi- tions influence the exchange coupling

Liu, J. Ping

412

Quality of life of patients after permanent prostate brachytherapy in relation to dosimetry  

SciTech Connect (OSTI)

Purpose: To investigate changes in quality of life (QoL) after permanent prostate brachytherapy and to correlate these changes with postimplant dosimetry based on magnetic resonance (MR) images. Methods and Materials: For this study, 127 patients with low-stage prostate cancer and treated with brachytherapy received a QoL questionnaire at five time points: before treatment and at 4 weeks, 6 months, 1 year, and 2 years after treatment. The questionnaire included the RAND-36 generic health survey, the cancer-specific European Organization for Research and Treatment of Cancer (EORTC) core questionnaire, the tumor-specific EORTC prostate cancer module, and the American Urological Association symptom index. Postimplant dosimetry was based on registered T1 spin echo transversal, T2 turbo spin echo transversal, and T2 turbo spin echo sagittal MR images and CT images taken 4 weeks after implantation of the iodine-125 seeds. Calculated parameters were prostate volume, prostate volume receiving 100% (V{sub 100}) and 150% (V{sub 150}) dose, dose to 90% of the prostate volume (D{sub 90}), maximum dose in 1-, 2-, and 5-cm{sup 3} rectum volume, distance between prostate and anterior rectum wall, and the maximum dose in 1%, 2%, and 5% urethra volume. Analysis of variance for repeated measures was used for comparison of the means of all variables in the different questionnaires. Linear regression analysis (stepwise) was used to investigate the correlations between QoL parameters and dosimetry parameters. Results: On average, only the QoL at 4 weeks after implant was significantly different from (worse than) the QoL at the other time points. Regression analysis showed a significant correlation between changes in bowel problems and the maximum dose in 2-cm{sup 3} rectum volume, between changes in urinary symptoms and prostate volume, and between changes in urinary problems and the D{sub 90} value of the prostate. Conclusions: The QoL for patients with permanent prostate implants was worse in the first months after treatment but returned to baseline values 1 year after implant. Significant correlations were found between dose distribution and QoL.

Gellekom, Marion van [Department of Radiotherapy, University Medical Center Utrecht, Utrecht (Netherlands)]. E-mail: marionvangellekom@yahoo.com; Moerland, Marinus A. [Department of Radiotherapy, University Medical Center Utrecht, Utrecht (Netherlands); Vulpen, Marco van [Department of Radiotherapy, University Medical Center Utrecht, Utrecht (Netherlands); Wijrdeman, Harm K. [Department of Radiotherapy, University Medical Center Utrecht, Utrecht (Netherlands); Battermann, Jan J. [Department of Radiotherapy, University Medical Center Utrecht, Utrecht (Netherlands)

2005-11-01T23:59:59.000Z

413

A PERMANENT A PERMANENT  

E-Print Network [OSTI]

of study to creating student-led "Changemaker Central" locations to drive impactful social innovation

McGraw, Kevin J.

414

Conveyorized Photoresist Stripping Replacement for Flex Circuit Fabrication  

SciTech Connect (OSTI)

A replacement conveyorized photoresist stripping system was characterized to replace the ASI photoresist stripping system. This system uses the qualified ADF-25c chemistry for the fabrication of flex circuits, while the ASI uses the qualified potassium hydroxide chemistry. The stripping process removes photoresist, which is used to protect the copper traces being formed during the etch process.

Megan Donahue

2009-02-24T23:59:59.000Z

415

CONSTRUCTION BY REPLACEMENT: A NEW APPROACH TO SIMULATION MODELING  

E-Print Network [OSTI]

CONSTRUCTION BY REPLACEMENT: A NEW APPROACH TO SIMULATION MODELING Authors: · James H Hines (MIT changes are needed. The paper describes an extensive experiment with using this approach to construct with another molecule. Using this tool kit, users can rapidly construct new simulation models by replacing

416

RELIABILITY OF SAMPLING INSPECTION SCHEMES APPLIED TO REPLACEMENT STEAM GENERATORS  

E-Print Network [OSTI]

RELIABILITY OF SAMPLING INSPECTION SCHEMES APPLIED TO REPLACEMENT STEAM GENERATORS Guy Roussel the size of the random sample of tubes to be inspected in replacement steam generators is revisited in this paper. A procedure to estimate the maximum number of defective tubes left in the steam generator after

Cizelj, Leon

417

Selecting the appropriate input data set when configuring a permanent workforce  

E-Print Network [OSTI]

of new personnel planning and scheduling problems for management. With over 70% of the global workforceSelecting the appropriate input data set when configuring a permanent workforce Jonathan F. Bard to use when running a scheduling model to select a permanent workforce for a service facility. Because

Bard, Jonathan

418

Iron-Nitride-Based Magnets: Synthesis and Phase Stabilization of Body Center Tetragonal (BCT) Metastable Fe-N Anisotropic Nanocomposite Magnet- A Path to Fabricate Rare Earth Free Magnet  

SciTech Connect (OSTI)

REACT Project: The University of Minnesota will develop an early stage prototype of an iron-nitride permanent magnet material for EVs and renewable power generators. This new material, comprised entirely of low-cost and abundant resources, has the potential to demonstrate the highest energy potential of any magnet to date. This project will provide the basis for an entirely new class of rare-earth-free magnets capable of generating power without costly and scarce rare earth materials. The ultimate goal of this project is to demonstrate a prototype with magnetic properties exceeding state-of-the-art commercial magnets.

None

2012-01-01T23:59:59.000Z

419

2.6 ELECTRIC AND MAGNETIC FIELDS Introduction  

E-Print Network [OSTI]

325 §2.6 ELECTRIC AND MAGNETIC FIELDS Introduction In electromagnetic theory the mks system MKS units Replacement symbol GAUSSIAN units # E (Electric field) volt/m # E statvolt/cm # B (Magnetic potential) weber/m # A c gauss­cm V (Electric potential) volt V statvolt # (Dielectric constant) # 4# µ

California at Santa Cruz, University of

420

Biointrusion test plan for the Permanent Isolation Surface Barrier Prototype  

SciTech Connect (OSTI)

This document provides a testing and monitoring plan for the biological component of the prototype barrier slated for construction at the Hanford Site. The prototype barrier is an aboveground structure engineered to demonstrate the basic features of an earthen cover system. It is designed to permanently isolate waste from the biosphere. The features of the barrier include multiple layers of soil and rock materials and a low-permeability asphalt sublayer. The surface of the barrier consists of silt loam soil, covered with plants. The barrier sides are reinforced with rock or coarse earthen-fill to protect against wind and water erosion. The sublayers inhibit plant and animal intrusion and percolation of water. A series of tests will be conducted on the prototype barrier over the next several years to evaluate barrier performance under extreme climatic conditions. Plants and animals will play a significant role in the hydrologic and water and wind erosion characteristics of the prototype barrier. Studies on the biological component of the prototype barrier will include work on the initial revegetation of the surface, continued monitoring of the developing plant community, rooting depth and dispersion in the context of biointrusion potential, the role of plants in the hydrology of the surface and toe regions of the barrier, the role of plants in stabilizing the surface against water and wind erosion, and the role of burrowing animals in the hydrology and water and wind erosion of the barrier.

Link, S.O.; Cadwell, L.L.; Brandt, C.A.; Downs, J.L.; Rossi, R.E.; Gee, G.W.

1994-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "replace permanent magnets" 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

Role of diffused Co atoms in improving effective exchange coupling in Sm-Co/Fe spring magnets Y. Choi,1,2 J. S. Jiang,1 Y. Ding,3 R. A. Rosenberg,4 J. E. Pearson,1 S. D. Bader,1 A. Zambano,5 M. Murakami,5  

E-Print Network [OSTI]

Role of diffused Co atoms in improving effective exchange coupling in Sm-Co/Fe spring magnets Y, 75.25. z, 68.55.Jk I. INTRODUCTION Exchange-spring permanent magnets have the potential to achieve-Co/Fe exchange-spring magnet films, the magnetization reversal processes of constituent elements and layers were

Wang, Zhong L.

422

MAGNETIC COUPLING BETWEEN DC TACHOMETER AND MOTOR AND ITS EFFECT ON MOTION CONTROL IN THE PRESENCE OF  

E-Print Network [OSTI]

orientations of the motor and tachometer permanent magnets......21 Fig. 4.5(b) Motor and Tachometer fieldsMAGNETIC COUPLING BETWEEN DC TACHOMETER AND MOTOR AND ITS EFFECT ON MOTION CONTROL IN THE PRESENCE OF SHAFT COMPLIANCE by Shorya Awtar A Thesis Submitted to the Graduate Faculty of Rensselaer Polytechnic

Awtar, Shorya

423

Comparison of 3 different postimplant dosimetry methods following permanent {sup 125}I prostate seed brachytherapy  

SciTech Connect (OSTI)

Postimplant dosimetry (PID) after Iodine-125 ({sup 125}I) implant of the prostate should offer a reliable qualitative assessment. So far, there is no consensus regarding the optimum PID method, though the latest literature is in favor of magnetic resonance imaging (MRI). This study aims to simultaneously compare 3 PID techniques: (1) MRI-computed tomography (CT) fusion; (2) ultrasound (US)-CT fusion; and (3) manual target delineation on CT. The study comprised 10 patients with prostate cancer. CT/MR scans with urinary catheters in place for PID were done either on day 0 or day 1 postimplantation. The main parameter evaluated and compared among methods was target D90. The results show that CT-based D90s are lower than US-CT D90s (median difference,?6.85%), whereas MR-CT PID gives higher D90 than US-CT PID (median difference, 4.25%). Manual contouring on CT images tends to overestimate the prostate volume compared with transrectal ultrasound (TRUS) (median difference, 23.33%), whereas on US images the target is overestimated compared with MR-based contouring (median difference, 13.25%). Although there are certain differences among the results given by various PID techniques, the differences are statistically insignificant for this small group of patients. Any dosimetric comparison between 2 PID techniques should also account for the limitations of each technique, to allow for an accurate quantification of data. Given that PID after permanent radioactive seed implant is mandatory for quality assurance, any imaging method–based PID (MR-CT, US-CT, and CT) available in a radiotherapy department can be indicative of the quality of the procedure.

Marcu, Loredana G., E-mail: loredana@marcunet.com [Department of Medical Physics, Royal Adelaide Hospital, South Australia (Australia); Faculty of Science, University of Oradea (Romania); School of Chemistry and Physics, University of Adelaide, South Australia (Australia); Gowda, Raghu [Department of Radiation Oncology, Royal Adelaide Hospital, South Australia (Australia)

2013-10-01T23:59:59.000Z

424

Cryogen free superconducting splittable quadrupole magnet for linear accelerators  

SciTech Connect (OSTI)

A new superconducting quadrupole magnet for linear accelerators was fabricated at Fermilab. The magnet is designed to work inside a cryomodule in the space between SCRF cavities. SCRF cavities must be installed inside a very clean room adding issues to the magnet design, and fabrication. The designed magnet has a splittable along the vertical plane configuration and could be installed outside of the clean room around the beam pipe previously connected to neighboring cavities. For more convenient assembly and replacement a 'superferric' magnet configuration with four racetrack type coils was chosen. The magnet does not have a helium vessel and is conductively cooled from the cryomodule LHe supply pipe and a helium gas return pipe. The quadrupole generates 36 T integrated magnetic field gradient, has 600 mm effective length, and the peak gradient is 54 T/m. In this paper the quadrupole magnetic, mechanical, and thermal designs are presented, along with the magnet fabrication overview and first test results.

Kashikhin, V.S.; Andreev, N.; Kerby, J.; Orlov, Y.; Solyak, N.; Tartaglia, M.; Velev, G.; /Fermilab

2011-09-01T23:59:59.000Z

425

Replacing the Rare Earth Intellectual Capital  

SciTech Connect (OSTI)

The rare earth crisis slowly evolved during a 10 to 15 year period beginning in the mid-1980s, when the Chinese began to export mixed rare earth concentrates. In the early 1990s, they started to move up the supply chain and began to export the individual rare earth oxides and metals. By the late 1990s the Chinese exported higher value products, such as magnets, phosphors, polishing compounds, catalysts; and in the 21st century they supplied finished products including electric motors, computers, batteries, liquid-crystal displays (LCDs), TVs and monitors, mobile phones, iPods and compact fluorescent lamp (CFL) light bulbs. As they moved to higher value products, the Chinese slowly drove the various industrial producers and commercial enterprises in the US, Europe and Japan out of business by manipulating the rare earth commodity prices. Because of this, the technically trained rare earth engineers and scientists who worked in areas from mining to separations, to processing to production, to manufacturing of semifinished and final products, were laid-off and moved to other fields or they retired. However, in the past year the Chinese have changed their philosophy of the 1970s and 1980s of forming a rare earth cartel to control the rare earth markets to one in which they will no longer supply the rest of the world (ROW) with their precious rare earths, but instead will use them internally to meet the growing demand as the Chinese standard of living increases. To this end, they have implemented and occasionally increased export restrictions and added an export tariff on many of the high demand rare earth elements. Now the ROW is quickly trying to start up rare earth mines, e.g. Molycorp Minerals in the US and Lynas Corp. in Australia, to cover this shortfall in the worldwide market, but it will take about five years for the supply to meet the demand, even as other mines in the ROW become productive. Unfortunately, today there is a serious lack of technically trained personnel to bring the entire rare earth industry, from mining to original equipment manufacturers (OEM), up to full speed in the next few years. Accompanying this decline in technical expertise, innovation and new products utilizing rare earth elements has slowed dramatically, and it may take a decade or more to recapture America's leading role in technological advancements of rare earth containing products. Before the disruption of the US rare earth industry, about 25,000 people were employed in all aspects of the industry from mining to OEM. Today, only about 1,500 people are employed in these fields. The ratio of non-technically trained persons to those with college degrees in the sciences or engineering varies from about 8 to 1 to about 4 to 1, depending on the particular area of the industry. Assuming an average of 6 to 1, the number of college degree scientists and engineers has decreased from about 4,000 to 250 employed today. In the magnetic industry the approximate numbers are: 6,000 total with 750 technically trained people in the 1980s to 500 totally employed today of which 75 have degrees. The paucity of scientists and engineers with experience and/or training in the various aspects of production and commercialization of the rare earths is a serious limitation to the ability of the US to satisfy its own needs for materials and technologies (1) to maintain our military strength and posture, (2) to assume leadership in critical energy technologies, and (3) to bring new consumer products to the marketplace. The lack of experts is of even greater national importance than the halting in the 1990s and the recent restart of the mining/benification/separation effort in the US; and thus governmental intervention and support for at least five to 10 years will be required to ameliorate this situation. To respond quickly, training programs should be established in conjunction with a national research center at an educational institution with a long tradition in multiple areas of rare earth and other critical elements research and technology. This center should

Gschneidner, Jr., Karl

2011-04-01T23:59:59.000Z

426

Milling Machine Replacement Project (4587), 5/11/2012  

Broader source: Energy.gov (indexed) [DOE]

by E-mail The proposed action is to replace two large milling machines with two new medium sized CNC milling machines. The new machines will be connected to the digital...

427

Drop-in replacement biofuels : meeting the challenge  

E-Print Network [OSTI]

This thesis presents a discussion on the challenges that must be met to fulfill the U.S. Navy's strategic imperatives for its energy vision. It provides an introduction to drop-in replacement biofuels, the options amongst ...

Bhargava, Alok (Alok Kishore)

2011-01-01T23:59:59.000Z

428

EA-0923: Winnett School District Boiler Replacement Project, Winnett, Montana  

Broader source: Energy.gov [DOE]

This EA evaluates the environmental impacts of the proposal to replace the Winnett School District complex's existing oil-fired heating system with a new coal-fired heating system with funds...

429

Washington State Department of Ecology: Replacement Wells Requiring...  

Open Energy Info (EERE)

Ecology: Replacement Wells Requiring a Water Right Jump to: navigation, search OpenEI Reference LibraryAdd to library Legal Document- OtherOther: Washington State Department of...

430

Laboratory Evaluation of LED T8 Replacement Lamp Products  

SciTech Connect (OSTI)

A report on a lab setting analysis involving LED lamps intended to directly replace T8 fluorescent lamps (4') showing light output, power, and economic comparisons with other fluorescent options.

Richman, Eric E.; Kinzey, Bruce R.; Miller, Naomi J.

2011-05-23T23:59:59.000Z

431

Ultrasound image guided acetabular implant orientation during total hip replacement  

DOE Patents [OSTI]

A system for assisting in precise location of the acetabular implant during total hip replacement. The system uses ultrasound imaging for guiding the placement and orientation of the implant.

Chang, John; Haddad, Waleed; Kluiwstra, Jan-Ulco; Matthews, Dennis; Trauner, Kenneth

2003-08-19T23:59:59.000Z

432

Replace Pressure-Reducing Valves with Backpressure Turbogenerators  

SciTech Connect (OSTI)

This revised ITP steam tip sheet on replacing pressure-reducing valves provides how-to advice for improving industrial steam systems using low-cost, proven practices and technologies.

Not Available

2006-01-01T23:59:59.000Z

433

Developing a total replacement cost index for suburban office projects  

E-Print Network [OSTI]

Understanding the components of replacement costs for office developments, and how these components combine to create total development costs is essential for success in office real estate development. Surprisingly, the ...

Hansen, David John, S.M. Massachusetts Institute of Technology

2006-01-01T23:59:59.000Z

434

Replacing Motors Counting Savings: Results from a 100 Motor Study  

E-Print Network [OSTI]

REPLACING MOTORS, COUNTING SAVINGS: RESULTS FROM A 100 MOTOR STUDY Nicole M. Kaufman Motor Systems Engineer Advanced Energy Raleigh, NC ABSTRACT Software tools such as MotorMaster+ aid facility personnel in conducting payback... analyses for replacing motors. These tools make assumptions on the motors’ operational efficiency in their calculations. By observing 100 pre-EPCA (Energy Policy & Conservation Act) motors in operation, removing them from service and conducting IEEE...

Kaufman, N. M.

2006-01-01T23:59:59.000Z

435

Diploma Replacement Request Form Students who have misplaced or lost their original diplomas may order a replacement diploma. The cost for each  

E-Print Network [OSTI]

Diploma Replacement Request Form Students who have misplaced or lost their original diplomas may order a replacement diploma. The cost for each replacement diploma is $25.00 ($35.00 for D.M.D, J.D., LL.M., and M.D). Please fill out the applicable information and mail it to the address below. Replacement

Guenther, Frank

436

Fluorescent lamp unit with magnetic field generating means  

DOE Patents [OSTI]

A fluorescent lamp unit having a magnetic field generating means for improving the performance of the fluorescent lamp is disclosed. In a preferred embodiment the fluorescent lamp comprises four longitudinally extending leg portions disposed in substantially quadrangular columnar array and joined by three generally U-shaped portions disposed in different planes. In another embodiment of the invention the magnetic field generating means comprises a plurality of permanent magnets secured together to form a single columnar structure disposed within a centrally located region defined by the shape of lamp envelope. 4 figs.

Grossman, M.W.; George, W.A.

1989-08-08T23:59:59.000Z

437

Atom Replacement in Hypergraphs Annegret Habel 1 and Renate Klempien-Hinrichs 2  

E-Print Network [OSTI]

Atom Replacement in Hypergraphs Annegret Habel 1 and Renate Klempien-Hinrichs 2 1 Carl v. Ossietzky. TAGT'98, Universitat-GH Paderborn, 182-189, 1998. Node replacement and hyperedge replacement are two, we combine both concepts to a concept of atom replacement that allows the replacement of the atomic

Habel, Annegret

438

Vacuum properties of sintered SmCo/sub 5/ magnets  

SciTech Connect (OSTI)

There are many desirable applications of powerful, rare-earth permanent magnets made of sintered SmCo/sub 5/ material within vacuum systems. One application is the use of large numbers of SmCo/sub 5/ magnets to provide the undulating magnetic field in a free-electron-laser wiggler structure. Tests were conducted at Los Alamos to determine the suitability of SmCo/sub 5/ magnets in a vacuum environment of approx. 10/sup -6/ torr. The vacuum performances of the wiggler system, with and without the SmCo/sub 5/ magnets (having approx. 11% of the total surface area) installed, were essentially identical. These tests indicate that SmCo/sub 5/ magnets have good vacuum properties and are suitable for use in many vacuum systems.

Warren, R.W.; DePaula, R.F.; Hansborough, L.D.

1981-12-01T23:59:59.000Z

439

Evaluation of the filler effects on fatique cracking and permanent deformation of asphalt concrete mixtures  

E-Print Network [OSTI]

The addition of hydrated lime to asphalt has shown to be beneficial with an improvement in the Theological properties of the binder, as well as resistance to permanent deformation (rutting) and fatigue cracking of asphalt concrete mixtures...

Izzo, Richard P

1997-01-01T23:59:59.000Z

440

Study of permanent deformation mechanism in asphalt mixes in relation to microcrack growth  

E-Print Network [OSTI]

Recent developments by Lytton et al. (1998) indicate phics. that the growth of micrographs in asphalt layers under repeated loading is also a cause for the accumulation of permanent deformation or rutting in pavements besides the plastic strain...

Bhairampally, Rajesh Kumar

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "replace permanent magnets" 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

Factors affecting the permanence of livestock projects undertaken by Heifer International-Mexico  

E-Print Network [OSTI]

in the state of Durango, Mexico. This study identified and analyzed the factors affecting the permanence of hog and dairy cow projects in four communities in the state of Durango, Mexico. The researcher interviewed seven project managers and 35 beneficiaries...

Arispe, Sergio Adrian

2003-01-01T23:59:59.000Z

442

Dual Functional Polyelectrolyte Multilayer Coatings for Implants: Permanent Microbicidal Base with Controlled Release of Therapeutic Agents  

E-Print Network [OSTI]

Here we present a new bifunctional layer-by-layer (LbL) construct made by combining a permanent microbicidal polyelectrolyte multilayered (PEM) base film with a hydrolytically degradable PEM top film that offers controlled ...

Wong, Sze Yinn

443

DOE-Sponsored Field Test Finds Potential for Permanent Storage of CO2 in Lignite Seams  

Broader source: Energy.gov [DOE]

A field test sponsored by the U.S. Department of Energy has demonstrated that opportunities to permanently store carbon in unmineable seams of lignite may be more widespread than previously documented.

444

Predicting Hurricane Intensity and Structure Changes Associated with Eyewall Replacement Cycles  

E-Print Network [OSTI]

Predicting Hurricane Intensity and Structure Changes Associated with Eyewall Replacement Cycles replacement cycles are commonly observed in tropical cyclones and are well known to cause fluctuations associated with eyewall replacement cycles in Atlantic Ocean hurricanes. The model input comprises

Kossin, James P.

445

Functional replacement of a primary metabolic pathway via multiple independent eukaryote-to-eukaryote gene transfers  

E-Print Network [OSTI]

Functional replacement of a primary metabolic pathway via multiple independent eukaryote can be added to the recipient's gene complement (gene additions) or simply replace existing endogenous counterparts (functional replacements). The recruitment of novel genes is thought to allow the recipient

Nedelcu, Aurora M.

446

Development of FCC catalyst magnetic separation  

SciTech Connect (OSTI)

Magnetic separation has been historically active in several different industries, yet has not been utilized in petroleum refining until recently. Development of economical permanent magnets with high magnetic strength has led to a new process known as MagnaCat{reg_sign}. The MagnaCat{reg_sign}. Process separates less active (high metals) particles catalyst from equilibrium Fluid Catalytic Cracking (FCC) catalyst, producing a higher activity/lower metals catalyst for recycle. Pilot FCC studies showed lower hydrogen, dry gas, and coke make with higher wet gas and octane from catalyst separated by MagnaCat{reg_sign}. With the use of a MagnaCat{reg_sign} Process unit, a refiner would produce an economic advantage of $0.20 to $0.40/Barrel of FCC charge and enhance unit operability.

Goolsby, T.L.; Moore, H.F. [Ashland Petroleum Co., KY (United States)

1997-01-01T23:59:59.000Z

447

Magnetic investigations  

SciTech Connect (OSTI)

Air and ground magnetic anomalies in the Climax stock area of the NTS help define the gross configuration of the stock and detailed configuration of magnetized rocks at the Boundary and Tippinip faults that border the stock. Magnetizations of geologic units were evaluated by measurements of magnetic properties of drill core, minimum estimates of magnetizations from ground magnetic anomalies for near surface rocks, and comparisons of measured anomalies with anomalies computed by a three-dimensional forward program. Alluvial deposits and most sedimentary rocks are nonmagnetic, but drill core measurements reveal large and irregular changes in magnetization for some quartzites and marbles. The magnetizations of quartz monzonite and granodiorite near the stock surface are weak, about 0.15 A/m, and increase at a rate of 0.00196 A/m/m to 1.55 A/m, at depths greater than 700 m (2300 ft). The volcanic rocks of the area are weakly magnetized. Aeromagnetic anomalies 850 m (2800 ft) above the stock are explained by a model consisting of five vertical prisms. Prisms 1, 2, and 3 represent the near surface outline of the stock, prism 4 is one of the models developed by Whitehill (1973), and prism 5 is modified from the model developed by Allingham and Zietz (1962). Most of the anomaly comes from unsampled and strongly-magnetized deep sources that could be either granite or metamorphosed sedimentary rocks. 48 refs., 23 figs., 3 tabs.

Bath, G.D.; Jahren, C.E.; Rosenbaum, J.G. [Geological Survey, Denver, CO (USA); Baldwin, M.J. [Fenix and Scisson, Inc., Mercury, NV (USA)

1983-12-31T23:59:59.000Z

448

Microstructure, Mechanical Behavior, and Clinical Trade-offs in Ultra-High Molecular Weight Polyethylene for Total Joint Replacement  

E-Print Network [OSTI]

components for total joint replacement. J Bone Joint Surgcontemporary total knee replacements. Clin Orthop Relat Res(wear in total joint replacement? J Am Acad Orthop Surg, 16

Atwood, Sara Anne

2010-01-01T23:59:59.000Z

449

Strange Magnetism  

E-Print Network [OSTI]

We present an analytic and parameter-free expression for the momentum dependence of the strange magnetic form factor of the nucleon and its corresponding radius which has been derived in Heavy Baryon Chiral Perturbation Theory. We also discuss a model-independent relation between the isoscalar magnetic and the strange magnetic form factors of the nucleon based on chiral symmetry and SU(3) only. These limites are used to derive bounds on the strange magnetic moment of the proton from the recent measurement by the SAMPLE collaboration.

Thomas R. Hemmert; Ulf-G. Meissner; Sven Steininger

1998-11-09T23:59:59.000Z

450

Magnetic Field Safety Magnetic Field Safety  

E-Print Network [OSTI]

Magnetic Field Safety Training #12;Magnetic Field Safety Strong Magnetic Fields exist around energized magnets. High magnetic fields alone are a recognized hazard only for personnel with certain medical conditions such as pacemakers, magnetic implants, or embedded shrapnel. In addition, high magnetic

McQuade, D. Tyler

451

Magnetic response enhancement via electrically induced magnetic moments  

E-Print Network [OSTI]

The realization of negative refraction in atomic gases requires a strong magnetic response of the atoms. Current proposals for such systems achieve an enhancement of the magnetic response by a suitable laser field configuration, but still rely on high gas densities. Thus further progress is desirable, and this requires an understanding of the precise mechanism for the enhancement. Therefore, here we study the magnetic and electric response to a probe field interacting with three-level atoms in ladder configuration. In our first model, the three transitions are driven by a control field and the electric and magnetic component of the probe field, giving rise to a closed interaction loop. In a reference model, the coherent driving is replaced by an incoherent pump field. A time-dependent analysis of the closed-loop system enables us to identify the different contributions to the medium response. A comparison with the reference system then allows one to identify the physical mechanism that leads to the enhancement. It is found that the enhancement occurs at so-called multiphoton resonance by a scattering of the coupling field and the electric probe field mode into the magnetic probe field mode. Based on these results, conditions for the enhancement are discussed.

B. Jungnitsch; J. Evers

2008-04-22T23:59:59.000Z

452

Reduced electron temperature in a magnetized inductively-coupled plasma with internal coil  

SciTech Connect (OSTI)

The effect of magnetic filtering on the electron energy distribution function is studied in an inductive discharge with internal coil coupling. The coil is placed inside the plasma and driven by a low-frequency power supply (5.8 MHz) which leads to a very high power transfer efficiency. A permanent dipole magnet may be placed inside the internal coil to produce a static magnetic field around 100 Gauss. The coil and the matching system are designed to minimize the capacitive coupling to the plasma. Capacitive coupling is quantified by measuring the radiofrequency (rf) plasma potential with a capacitive probe. Without the permanent magnet, the rf plasma potential is significantly smaller than the electron temperature. When the magnet is present, the rf plasma potential increases. The electron energy distribution function is measured as a function of space with and without the permanent magnet. When the magnet is present, electrons are cooled down to low temperature in the downstream region. This region of low electron temperature may be useful for plasma processing applications, as well as for efficient negative ion production.

Arancibia Monreal, J.; Chabert, P. [LPP, CNRS, Ecole Polytechnique, UPMC, Paris XI, 91128 Palaiseau (France)] [LPP, CNRS, Ecole Polytechnique, UPMC, Paris XI, 91128 Palaiseau (France); Godyak, V. [RF Plasma Consulting, Brookline, Massachusetts 02446 (United States) [RF Plasma Consulting, Brookline, Massachusetts 02446 (United States); Michigan Institute for Plasma Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States)

2013-10-15T23:59:59.000Z

453

Stress Testing of the Philips 60W Replacement Lamp L Prize Entry  

SciTech Connect (OSTI)

The Pacific Northwest National Laboratory, operated by Battelle for the U.S. Department of Energy, worked with Intertek to develop a procedure for stress testing medium screw-base light sources. This procedure, composed of alternating stress cycles and performance evaluation, was used to qualitatively compare and contrast the durability and reliability of the Philips 60W replacement lamp L Prize entry with market-proven compact fluorescent lamps (CFLs) with comparable light output and functionality. The stress cycles applied simultaneous combinations of electrical, thermal, vibration, and humidity stresses of increasing magnitude. Performance evaluations measured relative illuminance, x chromaticity and y chromaticity shifts after each stress cycle. The Philips L Prize entry lamps appear to be appreciably more durable than the incumbent energy-efficient technology, as represented by the evaluated CFLs, and with respect to the applied stresses. Through the course of testing, all 15 CFL samples permanently ceased to function as a result of the applied stresses, while only 1 Philips L Prize entry lamp exhibited a failure, the nature of which was minor, non-destructive, and a consequence of a known (and resolved) subcontractor issue. Given that current CFL technology appears to be moderately mature and no Philips L Prize entry failures could be produced within the stress envelope causing 100 percent failure of the benchmark CFLs, it seems that, in this particular implementation, light-emitting diode (LED) technology would be much more durable in the field than current CFL technology. However, the Philips L Prize entry lamps used for testing were carefully designed and built for the competition, while the benchmark CFLs were mass produced for retail sale—a distinction that should be taken into consideration. Further reliability testing on final production samples would be necessary to judge the extent to which the results of this analysis apply to production versions of the Philips L Prize entry.

Poplawski, Michael E.; Ledbetter, Marc R.; Smith, Mark

2012-04-24T23:59:59.000Z

454

Thermal Stability of MnBi Magnetic Materials  

SciTech Connect (OSTI)

MnBi attracts great attention in recent years for its great potential as permanent magnet materials. It is unique because its coercivity increases with increasing temperature, which makes it a good hard phase for exchange coupling nanocomposite magnet. MnBi phase is difficult to obtain, partly because the reaction between Mn and Bi is peritectic, and partly because Mn is easy to react with oxygen. MnO formation is irreversible and causes degradation to the magnetic properties. In this paper, we report our effort on developing MnBi permanent magnet. High purity MnBi (>90%) can be routinely produced in large quantity. The obtained powder exhibit 74 emu/g saturation magnetization at room temperature with 9 T applied field. After alignment, the powder exhibits 11.6 MGOe, and the sintered bulk magnet exhibit 7.8 MGOe at room temperature. Thermal stability study shows that the MnBi is stable up to 473 K in air.

Cui, Jun; Choi, Jung-Pyung; Li, Guosheng; Polikarpov, Evgueni; Darsell, Jens T.; Overman, Nicole R.; Olszta, Matthew J.; Schreiber, Daniel K.; Bowden, Mark E.; Droubay, Timothy C.; Kramer, Matthew J.; Zarkevich, Nikolai; Wang, L. L.; Johnson, Duane D.; Marinescu, Melania; Takeuchi, Ichiro; Huang, Qingzhen; Wu, Hui; Reeve, Hayden; Vuong, Nguyen V.; Liu, J.Ping

2014-01-01T23:59:59.000Z

455

Thermal stability of MnBi magnetic materials  

SciTech Connect (OSTI)

MnBi has attracted much attention in recent years due to its potential as a rare-earth-free permanent magnet material. It is unique because its coercivity increases with increasing temperature, which makes it a good hard phase material for exchange coupling nanocomposite magnets. MnBi phase is difficult to obtain, partly because the reaction between Mn and Bi is peritectic, and partly because Mn reacts readily with oxygen. MnO formation is irreversible and harmful to magnet performance. In this paper, we report our efforts toward developing MnBi permanent magnets. To date, high purity MnBi (>90%) can be routinely produced in large quantities. The produced powder exhibits 74:6 emu g1 saturation magnetization at room temperature with 9 T applied field. After proper alignment, the maximum energy product (BH) max of the powder reached 11.9 MGOe, and that of the sintered bulk magnet reached 7.8 MGOe at room temperature. A comprehensive study of thermal stability shows that MnBi powder is stable up to 473 K in air.

Cui, Jinfang [Pacific Northwest National Laboratory; Choi, J. P. [Pacific Northwest National Laboratory; Li, G. [Pacific Northwest National Laboratory; Polikarpov, E. [Pacific Northwest National Laboratory; Darsell, J. [Pacific Northwest National Laboratory; Overman, N. [Pacific Northwest National Laboratory; Olszta, M. [Pacific Northwest National Laboratory; Schreiber, D. [Pacific Northwest National Laboratory; Bowden, M. [Environmental Molecular Sciences Laboratory; Droubay, T. [Pacific Northwest National Laboratory; Kramer, Matthew J. [Ames Laboratory; Zarkevich, Nikolay A. [Ames Laboratory; Wang, L L. [Ames Laboratory; Johnson, Duane D. [Ames Laboratory; Marinescu, M. [Electron Energy Corporation; Takeuchi, I. [University of Maryland; Huang, Q. Z. [National Institute of Standards and Technology; Wu, H. [University of Maryland; Reeve, H. [United Technologies Research Center; Vuong, N. V. [University of Texas; Liu, J P. [University of Texas

2014-01-27T23:59:59.000Z

456

Quench margin measurement in Nb3Sn quadrupole magnet  

SciTech Connect (OSTI)

One of the possible practical applications of the Nb{sub 3}Sn accelerator magnets is the LHC luminosity upgrade that involves replacing the present NbTi focusing quadrupoles in two high-luminosity interaction regions (IR). The IR magnets are exposed to strong radiation from the interaction point that requires a detailed investigation of the magnet operating margins under the expected radiation-induced heat depositions. This paper presents the results of simulation and measurement of quench limits and temperature margins for a Nb{sub 3}Sn model magnet using a special midplane strip heater.

Kashikhin, V.V.; Bossert, R.; Chlachidze, G.; Lamm, M.; Novitski, I.; Zlobin, A.V.; /Fermilab

2008-08-01T23:59:59.000Z

457

Replacing the whole barrel of oil with plants and microbes  

SciTech Connect (OSTI)

In this May 13, 2013 talk, Blake Simmons discusses how scientists are exploring how plants and microbes can be used to replace many of the everyday goods we use that are derived from petroleum. To watch the entire entire Science at the Theater event, in which seven of our scientists present BIG ideas in eight minutes each.

Simmons, Blake

2013-05-29T23:59:59.000Z

458

Operations, Maintenance, and Replacement 10-Year Plan, 1990 -1999.  

SciTech Connect (OSTI)

In 1988 Bonneville Power Administration (BPA) began work on this Operations, Maintenance, and Replacement 10-Year Plan to develop a levelized program that would assure high system reliability. During the Programs in Perspective (PIP) meetings in the late summer and fall of 1988, many of the concerns to be addressed in an Operations, Maintenance, and Replacement Plan were identified. Following these PIP meetings BPA established internal work groups. During the winter and spring of 1989, these work groups developed technical background and issue papers on topics that ranged from substation maintenance to environmental protection. In addition, a customer forum group was established and met on several occasions to review work on the plan, to offer ideas and points of view, and to assure that BPA understood customer concerns. Based on recommendations from the work group reports and customer input, BPA's O M Management Team developed the draft Operations, Maintenance, and Replacement 10-Year Plan that was released for public comment during the spring of 1990. During the public review period, BPA received a number of written comments from customers and the interested public. In addition, special meetings were held with interested customers. This final Operations, Maintenance, and Replacement 10-Year Plan reflects BPA's response to customers and interested public on each topic discussed in the 10-Year Plan. The plan is a distillation of BPA's strategies to achieve a levelized program over 10 years.

United States. Bonneville Power Administration.

1990-08-01T23:59:59.000Z

459

Operations, Maintenance, and Replacement 10-Year Plan, 1990--1999  

SciTech Connect (OSTI)

In 1988 Bonneville Power Administration (BPA) began work on this Operations, Maintenance, and Replacement 10-Year Plan to develop a levelized program that would assure high system reliability. During the Programs in Perspective (PIP) meetings in the later summer and fall of 1988, many of the concerns to be addressed in an Operations, Maintenance, and Replacement Plan were identified. Following these PIP meetings BPA established internal work groups. During the winter and spring of 1989, these work groups developed technical background and issue papers on topics that ranged from substation maintenance to environmental protection. In addition, a customer forum group was established and met on several occasions to review work on the plan, to offer ideas and points of view, and to assure that BPA understood customer concerns. Based on recommendations from the work group reports and customer input, BPA's O M Management Team developed the draft Operations, Maintenance, and Replacement 10-Year Plan that was released for public comment during the spring of 1990. During the public review period, BPA received a number of written comments from customers and the interested public. In addition, special meetings were held with interested customers. This final Operations, Maintenance, and Replacement 10-year Plan reflects BPA's response to customers and interested public on each topic discussed in the 10-Year Plan. The plan is a distillation of BPA's strategies to achieve a levelized program over 10 years.

Not Available

1990-08-01T23:59:59.000Z

460

HVAC & Building Management Control System Energy Efficiency Replacements  

SciTech Connect (OSTI)

The project objective was the replacement of an aging, un-repairable HVAC system which has grown inefficient and a huge energy consumer with low energy and efficient HVAC units, and installation of energy efficient building control technologies at City's YMCA Community Center.

Hernandez, Adriana

2012-09-21T23:59:59.000Z

Note: This page contains sample records for the topic "replace permanent magnets" 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

Can Computer Simulations Replace Real Equipment in Undergraduate Laboratories?  

E-Print Network [OSTI]

Can Computer Simulations Replace Real Equipment in Undergraduate Laboratories? N. D. Finkelstein, K, Boulder Abstract. This paper examines the effects of substituting computer simulations in place of real (DC) circuit laboratory was modified to compare the effects of using computer simulations

Colorado at Boulder, University of

462

Replacing the whole barrel of oil with plants and microbes  

ScienceCinema (OSTI)

In this May 13, 2013 talk, Blake Simmons discusses how scientists are exploring how plants and microbes can be used to replace many of the everyday goods we use that are derived from petroleum. To watch the entire entire Science at the Theater event, in which seven of our scientists present BIG ideas in eight minutes each.

Simmons, Blake

2014-06-24T23:59:59.000Z

463

Data Mining For Prediction of Aircraft Component Replacement  

E-Print Network [OSTI]

Data Mining For Prediction of Aircraft Component Replacement Sylvain Letourneau1 Fazel Famili1 Stan the number of delays, and increasing the overall level of safety. Several data mining techniques exist from the data obtained during the operation and maintenance of aircraft is extremely challenging. Di

Matwin, Stan

464

Magnetic shielding  

DOE Patents [OSTI]

A magnetically-conductive filler material bridges the gap between a multi-part magnetic shield structure which substantially encloses a predetermined volume so as to minimize the ingress or egress of magnetic fields with respect to that volume. The filler material includes a heavy concentration of single-magnetic-domain-sized particles of a magnetically conductive material (e.g. soft iron, carbon steel or the like) dispersed throughout a carrier material which is generally a non-magnetic material that is at least sometimes in a plastic or liquid state. The maximum cross-sectional particle dimension is substantially less than the nominal dimension of the gap to be filled. An epoxy base material (i.e. without any hardening additive) low volatility vacuum greases or the like may be used for the carrier material. The structure is preferably exposed to the expected ambient field while the carrier is in a plastic or liquid state so as to facilitate alignment of the single-magnetic-domain-sized particles with the expected magnetic field lines.

Kerns, J.A.; Stone, R.R.; Fabyan, J.

1985-02-12T23:59:59.000Z

465

Magnetic nanotubes  

DOE Patents [OSTI]

A magnetic nanotube includes bacterial magnetic nanocrystals contacted onto a nanotube which absorbs the nanocrystals. The nanocrystals are contacted on at least one surface of the nanotube. A method of fabricating a magnetic nanotube includes synthesizing the bacterial magnetic nanocrystals, which have an outer layer of proteins. A nanotube provided is capable of absorbing the nanocrystals and contacting the nanotube with the nanocrystals. The nanotube is preferably a peptide bolaamphiphile. A nanotube solution and a nanocrystal solution including a buffer and a concentration of nanocrystals are mixed. The concentration of nanocrystals is optimized, resulting in a nanocrystal to nanotube ratio for which bacterial magnetic nanocrystals are immobilized on at least one surface of the nanotubes. The ratio controls whether the nanocrystals bind only to the interior or to the exterior surfaces of the nanotubes. Uses include cell manipulation and separation, biological assay, enzyme recovery, and biosensors.

Matsui, Hiroshi (Glen Rock, NJ); Matsunaga, Tadashi (Tokyo, JP)

2010-11-16T23:59:59.000Z

466

Reducing the Replacement Overhead on COMA Protocols for Workstation-Based Architectures  

E-Print Network [OSTI]

Reducing the Replacement Overhead on COMA Protocols for Workstation-Based Architectures Diego R discuss the behavior of the replacement mechanism of well-known COMA protocols applied to a loosely replacement mecha- nism in order to select the destination node of a replacement transaction without

Llanos, Diego R.

467

Mineral replacement rate of olivine by chrysotile and brucite under high1 alkaline conditions2  

E-Print Network [OSTI]

1 Mineral replacement rate of olivine by chrysotile and brucite under high1 alkaline conditions2 3.1016/j.jcrysgro.2012.02.040 #12;2 Abstract16 Olivine mineral replacement by serpentine is one major replaced by18 chrysotile and brucite under high alkaline conditions. In our study, olivine replacement19

Paris-Sud XI, Université de

468

University of South Carolina Office of the University Registrar Request for Replacement Diploma  

E-Print Network [OSTI]

University of South Carolina Office of the University Registrar P F Request for Replacement Diploma Please Note Replacement diplomas are duplicates of the original diploma issued by USC. A request on the replacement diploma will reflect those of the current University Officers. Replacements can take up to 90 days

Almor, Amit

469

Experimental study on the cause of insufficiency of a transcutaneous pulmonary valve replacement  

E-Print Network [OSTI]

Experimental study on the cause of insufficiency of a transcutaneous pulmonary valve replacement for the replacement of pulmonary heart valves. This technique is a minimally invasive alternative to the replacement on known causes for insufficiencies of transcutaneous heart valve replacements. Out of that information

Berlin,Technische Universität

470

Initial submission or replacement of an Investigator's Brochure Page 1 of 2 (Version: January 25, 2012)  

E-Print Network [OSTI]

Initial submission or replacement of an Investigator's Brochure Page 1 of 2 (Version: January 25 or Replacement of an Investigator's Brochure or Product Monograph This form replaces a letter of explanation from or replacement of an Investigator's Brochure Page 2 of 2 (Version: January 25, 2012) 5) List all forms

Shoubridge, Eric

471

Magnetic error analysis of recycler pbar injection transfer line  

SciTech Connect (OSTI)

Detailed study of Fermilab Recycler Ring anti-proton injection line became feasible with its BPM system upgrade, though the beamline has been in existence and operational since year 2000. Previous attempts were not fruitful due to limitations in the BPM system. Among the objectives are the assessment of beamline optics and the presence of error fields. In particular the field region of the permanent Lambertson magnets at both ends of R22 transfer line will be scrutinized.

Yang, M.J.; /Fermilab

2007-06-01T23:59:59.000Z

472

Temperature measurement of axisymmetric flames under the influence of magnetic field using Talbot interferometry  

SciTech Connect (OSTI)

Combustion process control is related with ecological improvement and the problem of energy efficiency; hence it has a wide interest at both economical and scientific levels. Application of a magnetic field is one of the most promising methods of combustion control. The presence of magnetic field induces the changes in flame behavior. The effect of uniform magnetic field developed by permanent magnet is studied by Talbot interferometry using circular gratings. Experimental results show a small decrease in flame temperature and increase in flame dimensions.

Agarwal, Shilpi, E-mail: sipi.agarwal@gmail.com, E-mail: manojklakra@gmail.com, E-mail: cshakher@iddc.iitd.ac.in; Kumar, Manoj, E-mail: sipi.agarwal@gmail.com, E-mail: manojklakra@gmail.com, E-mail: cshakher@iddc.iitd.ac.in; Shakher, Chandra, E-mail: sipi.agarwal@gmail.com, E-mail: manojklakra@gmail.com, E-mail: cshakher@iddc.iitd.ac.in [Instrument Design Development Centre, Indian Institute of Technology Delhi, HauzKhas, New Delhi - 110016 (India)

2014-10-15T23:59:59.000Z

473

Dynamically stable magnetic suspension/bearing system  

DOE Patents [OSTI]

A magnetic bearing system contains magnetic subsystems which act together to support a rotating element in a state of dynamic equilibrium. However, owing to the limitations imposed by Earnshaw's Theorem, the magnetic bearing systems to be described do not possess a stable equilibrium at zero rotational speed. Therefore, mechanical stabilizers are provided, in each case, to hold the suspended system in equilibrium until its speed has exceeded a low critical speed where dynamic effects take over, permitting the achievement of a stable equilibrium for the rotating object. A state of stable equilibrium is achieved above a critical speed by use of a collection of passive elements using permanent magnets to provide their magnetomotive excitation. The magnetic forces exerted by these elements, when taken together, levitate the rotating object in equilibrium against external forces, such as the force of gravity or forces arising from accelerations. At the same time, this equilibrium is made stable against displacements of the rotating object from its equilibrium position by using combinations of elements that possess force derivatives of such magnitudes and signs that they can satisfy the conditions required for a rotating body to be stably supported by a magnetic bearing system over a finite range of those displacements.

Post, Richard F. (Walnut Creek, CA)

1996-01-01T23:59:59.000Z

474

Dynamically stable magnetic suspension/bearing system  

DOE Patents [OSTI]

A magnetic bearing system contains magnetic subsystems which act together to support a rotating element in a state of dynamic equilibrium. However, owing to the limitations imposed by Earnshaw`s Theorem, the magnetic bearing systems to be described do not possess a stable equilibrium at zero rotational speed. Therefore, mechanical stabilizers are provided, in each case, to hold the suspended system in equilibrium until its speed has exceeded a low critical speed where dynamic effects take over, permitting the achievement of a stable equilibrium for the rotating object. A state of stable equilibrium is achieved above a critical speed by use of a collection of passive elements using permanent magnets to provide their magnetomotive excitation. The magnetic forces exerted by these elements, when taken together, levitate the rotating object in equilibrium against external forces, such as the force of gravity or forces arising from accelerations. At the same time, this equilibrium is made stable against displacements of the rotating object from its equilibrium position by using combinations of elements that possess force derivatives of such magnitudes and signs that they can satisfy the conditions required for a rotating body to be stably supported by a magnetic bearing system over a finite range of those displacements. 32 figs.

Post, R.F.

1996-02-27T23:59:59.000Z

475

Fabrication of magnetic microfiltration systems using soft lithography Tao Deng, Mara Prentiss,a)  

E-Print Network [OSTI]

. The combination of microtransfer molding--a soft lithography technique--and electrodeposition generated nickel, Massachusetts 02138 Received 9 August 2001; accepted for publication 9 November 2001 Arrays of nickel posts were field from an external, permanent, neodymium­iron­boron magnet, these nickel posts generated strong

Prentiss, Mara

476

Application for the Issue of a Replacement Transcript To apply for the issue of a replacement transcript, complete all relevant sections below and  

E-Print Network [OSTI]

Page | 1 Application for the Issue of a Replacement Transcript To apply for the issue of a replacement transcript, complete all relevant sections below and return this form to Examinations students You will not be charged for this service. A replacement transcript can be supplied

Neirotti, Juan Pablo

477

Microporous Magnets  

SciTech Connect (OSTI)

Combining porosity and magnetic ordering in a single material presents a significant challenge since magnetic exchange generally requires short bridges between the spin carriers, whereas porosity usually relies on the use of long diamagnetic connecting ligands. Despite this apparent incompatibility, notable successes have been achieved of late in generating truly microporous solids with high magnetic ordering temperatures. In this critical review, we give an overview of this emerging class of multifunctional materials, with particular emphasis on synthetic strategies and possible routes to new materials with improved properties (149 references).

Dechambenoit, Pierre; Long, Jeffrey R.

2011-01-01T23:59:59.000Z

478

High damping properties of magnetic particles doped rubber composites at wide frequency  

SciTech Connect (OSTI)

Highlights: ? A new kind of permanent magnetic rubber was prepared. ? The microstructure and magnetic properties were investigated. ? The mechanical and damping properties were discussed. ? The new material is expected to be an isolator material to a changed frequency. - Abstract: A new kind of rubber composite was prepared by doping SrFe{sub 12}O{sub 19} nanoparticles coated with silane coupling agents (Si-69) into nitrile butadiene rubber (NBR) matrix, which was characterized by the scanning electron microscopy and X-ray spectroscopy. The results showed that the SrFe{sub 12}O{sub 19} nanoparticles were well dispersed in rubber matrix. Furthermore, the mechanical and magnetic properties of the rubber composites were investigated, in which the high tensile strength (15.8 MPa) and high saturation magnetization (22.9 emu/g) were observed. What is more, the high loss factor of the rubber composites was also obtained in a wide frequency range (0–100 Hz) at high loading (80 phr). The result is attributed to that the permanent magnetic field in rubber nanocomposites can absorb shock energy. These results indicate that the new kind of permanent magnetic rubber is expected to be a smart isolator material, in which the isolator will be able to adapt to a changed frequency.

Tian, Ye, E-mail: schtiany@163.com [Research Center for Engineering Technology of Polymeric Composites of Shanxi Province, North University of China, Taiyuan 030051 (China); College of Material Science and Engineering, North University of China, Taiyuan 030051 (China); Liu, Yaqing, E-mail: lyq@nuc.edu.cn [Research Center for Engineering Technology of Polymeric Composites of Shanxi Province, North University of China, Taiyuan 030051 (China); College of Material Science and Engineering, North University of China, Taiyuan 030051 (China); He, Minhong; Zhao, Guizhe; Sun, Youyi [Research Center for Engineering Technology of Polymeric Composites of Shanxi Province, North University of China, Taiyuan 030051 (China); College of Material Science and Engineering, North University of China, Taiyuan 030051 (China)

2013-05-15T23:59:59.000Z

479

Low dimensional magnetism  

E-Print Network [OSTI]

Magnetism in Ultracold Gases 4 Magnetic phase diagram of aMagnetism . . . . . . . . . . . .1.3 Magnetism in condensedIntroduction 1 Brief introduction to magnetism 1.1 Classic

Kjall, Jonas Alexander

2012-01-01T23:59:59.000Z

480

Brushless machine having ferromagnetic side plates and side magnets  

DOE Patents [OSTI]

An apparatus is provided having a cylindrical stator and a rotor that is spaced from a stator to define an annular primary air gap that receives AC flux from the stator. The rotor has a plurality of longitudinal pole portions disposed parallel to the axis of rotation and alternating in polarity around a circumference of the rotor. Each longitudinal pole portion includes portions of permanent magnet (PM) material and at least one of the longitudinal pole portions has a first end and an opposing second end and a side magnet is disposed adjacent the first end and a side pole is disposed adjacent the second end.

Hsu, John S

2012-10-23T23:59:59.000Z

Note: This page contains sample records for the topic "replace permanent magnets" 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

Stochastic Ratchet Mechanisms for Replacement of Proteins Bound to DNA  

E-Print Network [OSTI]

Experiments indicate that unbinding rates of proteins from DNA can depend on the concentration of proteins in nearby solution. Here we present a theory of multi-step replacement of DNA-bound proteins by solution-phase proteins. For four different kinetic scenarios we calculate the depen- dence of protein unbinding and replacement rates on solution protein concentration. We find (1) strong effects of progressive 'rezipping' of the solution-phase protein onto DNA sites liberated by 'unzipping' of the originally bound protein; (2) that a model in which solution-phase proteins bind non-specifically to DNA can describe experiments on exchanges between the non specific DNA- binding proteins Fis-Fis and Fis-HU; (3) that a binding specific model describes experiments on the exchange of CueR proteins on specific binding sites.

Simona Cocco; John F. Marko; Remi Monasson

2014-05-26T23:59:59.000Z

482

OSRAM SYLVANIA Develops High-Efficiency LED Troffer Replacement  

Broader source: Energy.gov [DOE]

With the help of DOE funding, OSRAM SYLVANIA is developing a high-efficiency LED 2'x2' troffer replacement that is expected to be commercially available in the spring of 2012 and to be cost-competitive with existing troffers of that size. It is projected to have a light output of up to 4,000 lumens, an efficacy of more than 100 lm/W, and a CCT of 3500K.

483

Measure Guideline: Air Conditioner Diagnostics, Maintenance, and Replacement  

SciTech Connect (OSTI)

This guideline responds to the need for an efficient means of identifying, diagnosing, and repairing faults in air conditioning systems in existing homes that are undergoing energy upgrades. Inadequate airflow due to constricted ducts or undersized filters, improper refrigerant charge, and other system defects can be corrected at a fraction of the cost of equipment replacement and can yield significant savings. The guideline presents a two-step approach to diagnostics and repair.

Springer, D.; Dakin, B.

2013-03-01T23:59:59.000Z

484

Controlling Magnetism at the Nanoscale  

E-Print Network [OSTI]

Manipulation of Magnetism - External148 Conclusion A The Magnetism Cheat Sheet A.1 Magnetic157 A.2 Magnetism Unit Conversion

Wong, Jared

2012-01-01T23:59:59.000Z

485

The magnetic flywheel flow meter: Theoretical and experimental contributions  

SciTech Connect (OSTI)

The development of contactless flow meters is an important issue for monitoring and controlling of processes in different application fields, like metallurgy, liquid metal casting, or cooling systems for nuclear reactors and transmutation machines. Shercliff described in his book “The Theory of Electromagnetic Flow Measurement, Cambridge University Press, 1962” a simple and robust device for contact-less measurements of liquid metal flow rates which is known as magnetic flywheel. The sensor consists of several permanent magnets attached on a rotatable soft iron plate. This arrangement will be placed closely to the liquid metal flow to be measured, so that the field of the permanent magnets penetrates into the fluid volume. The flywheel will be accelerated by a Lorentz force arising from the interaction between the magnetic field and the moving liquid. Steady rotation rates of the flywheel can be taken as a measure for the mean flow rate inside the fluid channel. The present paper provides a detailed theoretical description of the sensor in order to gain a better insight into the functional principle of the magnetic flywheel. Theoretical predictions are confirmed by corresponding laboratory experiments. For that purpose, a laboratory model of such a flow meter was built and tested on a GaInSn-loop under various test conditions.

Buchenau, D., E-mail: d.buchenau@hzdr.de; Galindo, V.; Eckert, S. [Helmholtz-Zentrum Dresden-Rossendorf, Institute of Fluid Dynamics, Bautzner Landstraße 400, 01328 Dresden (Germany)

2014-06-02T23:59:59.000Z

486

Precision formed micro magnets: LDRD project summary report  

SciTech Connect (OSTI)

A microfabrication process is described that provides for the batch realization of miniature rare earth based permanent magnets. Prismatic geometry with features as small as 5 microns, thicknesses up through several hundred microns and with submicron tolerances may be accommodated. The processing is based on a molding technique using deep x-ray lithography as a means to generate high aspect-ratio precision molds from PMMA (poly methyl methacrylate) used as an x-ray photoresist. Subsequent molding of rare-earth permanent magnet (REPM) powder combined with a thermosetting plastic binder may take place directly in the PMMA mold. Further approaches generate an alumina form replicated from the PMMA mold that becomes an intermediate mold for pressing higher density REPM material and allows for higher process temperatures. Maximum energy products of 3--8 MGOe (Mega Gauss Oersted, 1 MGOe = 100/4{pi} kJ/m{sup 3}) are obtained for bonded isotropic forms of REPM with dimensions on the scale of 100 microns and up to 23 MGOe for more dense anisotropic REPM material using higher temperature processing. The utility of miniature precision REPMs is revealed by the demonstration of a miniature multipole brushless DC motor that possesses a pole-anisotropic rotor with dimensions that would otherwise prohibit multipole magnetization using a multipole magnetizing fixture at this scale. Subsequent multipole assembly also leads to miniaturized Halbach arrays, efficient magnetic microactuators, and mechanical spring-like elements which can offset miniaturized mechanical scaling behavior.

CHRISTENSON,TODD R.; GARINO,TERRY J.; VENTURINI,EUGENE L.

2000-02-01T23:59:59.000Z

487

Draft 1992 : Operations, Maintenance, and Replacement 10-Year Plan.  

SciTech Connect (OSTI)

Two years ago, BPA released its first-ever Operations, Maintenance, and Replacement (OM&R) 10-Year Plan. That effort broke new ground and was an extensive look at the condition of Operations, Maintenance, and Replacement on BPA`s power system. This document -- the 1992 OM&R 10-Year Plan -- uses that original plan as its foundation. It takes a look at how well BPA has accomplished the challenging task set out in the 1990 Plan. The 1992 Plan also introduces the Construction Program. Construction`s critical role in these programs is explored, and the pressures of construction workload -- such as the seasonal nature of the work and the broad swings in workload between projects and years -- are discussed. The document then looks at how situations may have changed with issues explored initially in the 1990 Plan. Importantly, this Plan also surfaces and explains some new issues that threaten to impact BPA`s ability to accomplish its OM&R workload. Finally, the document focuses on the revised strategies for Operations, Maintenance, Replacement, Construction, and Environment for the 1992 to 2001 time period, including the financial and human resources needed to accomplish those strategies.

United States. Bonneville Power Administration.

1992-05-01T23:59:59.000Z

488

Draft 1992 : Operations, Maintenance, and Replacement 10-Year Plan.  

SciTech Connect (OSTI)

Two years ago, BPA released its first-ever Operations, Maintenance, and Replacement (OM R) 10-Year Plan. That effort broke new ground and was an extensive look at the condition of Operations, Maintenance, and Replacement on BPA's power system. This document -- the 1992 OM R 10-Year Plan -- uses that original plan as its foundation. It takes a look at how well BPA has accomplished the challenging task set out in the 1990 Plan. The 1992 Plan also introduces the Construction Program. Construction's critical role in these programs is explored, and the pressures of construction workload -- such as the seasonal nature of the work and the broad swings in workload between projects and years -- are discussed. The document then looks at how situations may have changed with issues explored initially in the 1990 Plan. Importantly, this Plan also surfaces and explains some new issues that threaten to impact BPA's ability to accomplish its OM R workload. Finally, the document focuses on the revised strategies for Operations, Maintenance, Replacement, Construction, and Environment for the 1992 to 2001 time period, including the financial and human resources needed to accomplish those strategies.

United States. Bonneville Power Administration.

1992-05-01T23:59:59.000Z

489

The National Energy Policy Act and lamp replacement options  

SciTech Connect (OSTI)

The National Policy Act of 1992 involves the creation of energy efficiency standards for a wide range of products including fluorescent and incandescent lamps. Minimum efficacy (lumens per watt) and color rendering index (CRI) standards are mandated for the popular fluorescent lamps: four-foot medium bi-pin, two-foot U-bent, eight-foot slimline and eight-foot high output. Minimum efficacies are mandated for specific incandescent R and PAR reflector lamps. These standards will affect selected colors and designs of fluorescent lamps, the most significant being the standard lamps in the cool white and warm white colors. The incandescent reflector lamps will include the R-30, R-40, PAR-38 lamps above 40 watts, excluding the halogen types. These efficiency and color rendering standards will require end-users and specifiers to select replacement fluorescent lamps from a range of performance characteristics (lumen output, efficacy, CRI and price). The choice of replacement for the R and PAR incandescent lamps will include the halogen designs and compact fluorescent designs. In this paper, replacement options will be analyzed and discussed and the effect of these options on the performance of the lighting system will be explored in detail.

Ryerson, C.

1995-06-01T23:59:59.000Z

490

A Model for Predicting Magnetic Targeting of Multifunctional Particles in the Microvasculature  

E-Print Network [OSTI]

A mathematical model is presented for predicting magnetic targeting of multifunctional carrier particles that are designed to deliver therapeutic agents to malignant tissue in vivo. These particles consist of a nonmagnetic core material that contains embedded magnetic nanoparticles and therapeutic agents such as photodynamic sensitizers. For in vivo therapy, the particles are injected into the vascular system upstream from malignant tissue, and captured at the tumor using an applied magnetic field. The applied field couples to the magnetic nanoparticles inside the carrier particle and produces a force that attracts the particle to the tumor. In noninvasive therapy the applied field is produced by a permanent magnet positioned outside the body. In this paper a mathematical model is developed for predicting noninvasive magnetic targeting of therapeutic carrier particles in the microvasculature. The model takes into account the dominant magnetic and fluidic forces on the particles and leads to an analytical expr...

Furlani, E J

2006-01-01T23:59:59.000Z

491

LEGAL BUSINESS NAME AND DBA NAME (as applicable) PERSON OR SOLE PROPRIETOR -ENTER FULL NAME HERE (Last, First) (REQUIRED) PERMANENT BUSINESS Address-(number & Street or P.O. Box) (REQUIRED) PERMANENT REMITTANCE Address (if different from Business Address)  

E-Print Network [OSTI]

LEGAL BUSINESS NAME AND DBA NAME (as applicable) PERSON OR SOLE PROPRIETOR -ENTER FULL NAME HERE (Last, First) (REQUIRED) PERMANENT BUSINESS Address- (number & Street or P.O. Box) (REQUIRED) PERMANENT REMITTANCE Address (if different from Business Address) (OPTIONAL) CAMPUS MAIL STOP (Complete ONLY after

California at Santa Cruz, University of

492

Radiation dose to the internal pudendal arteries from permanent-seed prostate brachytherapy as determined by time-of-flight MR angiography  

SciTech Connect (OSTI)

Purpose: To determine the feasibility of time-of-flight magnetic resonance (MR) angiography to visualize the internal pudendal arteries (IPAs) in potent men undergoing permanent-seed prostate brachytherapy and to calculate the radiation dose received by these arteries. Methods and Materials: Prostate brachytherapy is performed at the University Health Network/Princess Margaret Hospital by use of transrectal ultrasound (TRUS) preplanning and preloaded needles. All patients received {sup 125}I, with a mean seed activity of 0.32 mCi/seed (0.41 U). Postplan evaluation is performed at 1 month by magnetic resonance-computed tomography fusion. Twenty consecutive potent men had time-of-flight MR angiography as part of their postplan evaluation. Results: The mean V100 was 96.5%, and the mean D90 was171.5 Gy. The IPAs were easily visualized for 18 of the 20 men. The mean peak dose received by the IPA was 17 Gy. The highest peak dose received by any patient was 38.2 Gy, with only 1 other patient receiving a peak dose greater than 30 Gy. Eleven of 18 had a measurable portion of at least 1 IPA that received 10% of the prescribed dose (V10 = 14.5 Gy). Only 2 patients had nonzero values for V25. The distal third of the IPA received the highest dose for 16 of the 18 patients. Conclusions: The IPAs can be well visualized in the majority of potent men by use of time-of-flight MR angiography 1 month after brachytherapy. The IPAs receive a low but calculable dose from permanent-seed {sup 125}I brachytherapy. Further research is needed to determine if this outcome has any correlation with subsequent potency.

Gillan, Caitlin [Department of Radiation Medicine, University Health Network, Princess Margaret Hospital, Toronto (Canada); Kirilova, Anna [Department of Radiation Physics, University Health Network, Princess Margaret Hospital, Toronto (Canada); Landon, Angela [Department of Radiation Medicine, University Health Network, Princess Margaret Hospital, Toronto (Canada); Yeung, Ivan [Department of Radiation Physics, University Health Network, Princess Margaret Hospital, Toronto (Canada); Pond, Gregory [Department of Biostatistics, University Health Network, Princess Margaret Hospital, Toronto (Canada); Crook, Juanita [Department of Radiation Oncology, University Health Network, Princess Margaret Hospital, Toronto (Canada)]. E-mail: juanita.crook@rmp.uhn.on.ca

2006-07-01T23:59:59.000Z

493

Author's personal copy Mapping and characterization of non-polar permanent shadows on the lunar surface  

E-Print Network [OSTI]

as close to the equator as ±58° of latitude. These results were obtained through application of a ray. Each permanent shadow on the equator side of ±65° of latitude is shown in detail. Surface brightness Mapping Spectrometer (VIMS), the Deep Impact High-Resolution Instru- ment-IR spectrometer (HRI

Spudis, Paul D.

494

Helix-Sense Selective Polymerization of Carbodiimides: Building Permanently Optically Active Polymers from Achiral Monomers  

E-Print Network [OSTI]

Helix-Sense Selective Polymerization of Carbodiimides: Building Permanently Optically Active polymerizations of achiral monomers using chiral catalysts.8 For this approach to be viable, the helical the polymerization of achiral carbodiimides with optically active catalysts to yield stable helical materials

495

AN ISSUE OF PERMANENCE: ASSESSING THE EFFECTIVENESS OF TEMPORARY CARBON STORAGE  

E-Print Network [OSTI]

with a `leaky' carbon sequestration reservoir, we argue that this is an issue that applies to just about all that the value of relatively deep ocean carbon sequestration can be nearly equivalent to permanent sequestration gases using carbon sequestration technologies (Herzog et al., 2000; Herzog, 2001) is being proposed

496

RESOLUTION TO APPROVE A PROPOSAL TO ESTABLISH A MNOA ASSESSMENT COMMITTEE AS A PERMANENT  

E-Print Network [OSTI]

and uses for assessment of student learning at Mnoa. c) Review assessment resource needs and recommendRESOLUTION TO APPROVE A PROPOSAL TO ESTABLISH A MNOA ASSESSMENT COMMITTEE AS A PERMANENT COMMITTEE OF THE MANOA FACULTY SENATE (January 21, 2009) WHEREAS the purpose of the Mnoa Assessment Committee (MAC

497

Permanent Closure of MFC Biodiesel Underground Storage Tank 99ANL00013  

SciTech Connect (OSTI)

This closure package documents the site assessment and permanent closure of the Materials and Fuels Complex biodiesel underground storage tank 99ANL00013 in accordance with the regulatory requirements established in 40 CFR 280.71, “Technical Standards and Corrective Action Requirements for Owners and Operators of Underground Storage Tanks: Out-of-Service UST Systems and Closure.”

Kerry L. Nisson

2012-10-01T23:59:59.000Z

498

Origin and Phylogeny of Microbes Living in Permanent Antarctic Lake Ice  

E-Print Network [OSTI]

Origin and Phylogeny of Microbes Living in Permanent Antarctic Lake Ice D. A. Gordon,1, * J. Priscu of bacteria and cyanobacteria colonizing sediment particles in the per- manent ice cover of an Antarctic lake collected from a depth of 2.5 m in the 4-m-thick ice cover of Lake Bonney, McMurdo Dry Valleys, Antarctica

Priscu, John C.

499

Aprovaci de l'oferta de formaci permanent del curs 2013-14 (cursos pendents)  

E-Print Network [OSTI]

de juliol de 2014 #12;PROGRAMES DE FORMACIĂ? PERMANENT DE POSTGRAU. CURS 2013-14. ARQUITECTURA EdiciĂł Lloc d'imparticiĂł AprovaciĂł Arquitectura del Paisatge Departament d'Urbanisme i OrdenaciĂł del Territori 31 Barcelona CG 58/7 2013 Arquitectura i Medi Ambient: IntegraciĂł d'Energies Renovables a l'Arquitectura

Yannuzzi Sanchez, Marcelo

500

OFERTA DE PROGRAMES DE FORMACI PERMANENT DEL CURS ACADMIC 2011/12  

E-Print Network [OSTI]

OFERTA DE PROGRAMES DE FORMACIĂ? PERMANENT CURS 2011-12 ARQUITECTURA, EDIFICACIĂ? I URBANISME MĂ ster Nom'imparticiĂł Arquitectura del Paisatge * Departament d'Urbanisme i OrdenaciĂł del Territori 29 Barcelona i MilĂ  Arquitectura i Medi Ambient: IntegraciĂł d'Energies Renovables a l'Arquitectura * Departament de Construccions

Politècnica de Catalunya, Universitat