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Title: Variable-frequency synchronous motor drives for electric vehicles

Abstract

The performance capability envelope of a variable-frequency, permanent-magnet synchronous motor drive with field weakening is dependent upon the product of maximum current and direct-axis inductance. To obtain a performance characteristic suitable for a typical electric vehicle drive, in which short-term increase of current is applied, it is necessary to design an optimum value of direct-axis inductance. The paper presents an analysis of a hybrid motor design which uses a two-part rotor construction comprising a surface-magnet part and an axially-laminated reluctance part. This arrangement combines the properties of all other types of synchronous motor and offers a greater choice of design variables. It is shown that the desired form of performance may be achieved when the high-inductance axis of the reluctance part is arranged to lead the magnet axis by 90{degree} (elec.).

Authors:
;  [1];  [2]
  1. Univ. of Manchester Inst. of Science and Technology (United Kingdom). Dept. of Electrical Engineering and Electronics
  2. Sydney Univ., New South Wales (Australia). Dept. of Electrical Engineering
Publication Date:
OSTI Identifier:
419557
Report Number(s):
CONF-9510203-
Journal ID: ISSN 0197-2618; TRN: IM9706%%101
Resource Type:
Conference
Resource Relation:
Conference: IEEE/Industrial Application Society conference, Orlando, FL (United States), 8-12 Oct 1995; Other Information: PBD: 1995; Related Information: Is Part Of Conference record of the 1995 IEEE Industry Applications Society, thirtieth IAS annual meeting. Volume 1; PB: 977 p.
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; ELECTRIC-POWERED VEHICLES; ELECTRIC MOTORS; FREQUENCY CONTROL; SYNCHRONIZATION; ENERGY EFFICIENCY

Citation Formats

Chalmers, B.J., Musaba, L., and Gosden, D.F. Variable-frequency synchronous motor drives for electric vehicles. United States: N. p., 1995. Web.
Chalmers, B.J., Musaba, L., & Gosden, D.F. Variable-frequency synchronous motor drives for electric vehicles. United States.
Chalmers, B.J., Musaba, L., and Gosden, D.F. 1995. "Variable-frequency synchronous motor drives for electric vehicles". United States. doi:.
@article{osti_419557,
title = {Variable-frequency synchronous motor drives for electric vehicles},
author = {Chalmers, B.J. and Musaba, L. and Gosden, D.F.},
abstractNote = {The performance capability envelope of a variable-frequency, permanent-magnet synchronous motor drive with field weakening is dependent upon the product of maximum current and direct-axis inductance. To obtain a performance characteristic suitable for a typical electric vehicle drive, in which short-term increase of current is applied, it is necessary to design an optimum value of direct-axis inductance. The paper presents an analysis of a hybrid motor design which uses a two-part rotor construction comprising a surface-magnet part and an axially-laminated reluctance part. This arrangement combines the properties of all other types of synchronous motor and offers a greater choice of design variables. It is shown that the desired form of performance may be achieved when the high-inductance axis of the reluctance part is arranged to lead the magnet axis by 90{degree} (elec.).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1995,
month =
}

Conference:
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  • The performance capability envelope of a variable-frequency, permanent-magnet synchronous motor drive with field weakening is dependent upon the product of maximum current and direct-axis inductance. To obtain a performance characteristic suitable for a typical electric vehicle drive, in which short-term increase of current is applied, it is necessary to design an optimum value of direct-axis inductance. The paper presents an analysis of a hybrid motor design which uses a two-part rotor construction comprising a surface-magnet part and an axially laminated reluctance part. This arrangement combines the properties of all other types of synchronous motor and offers a greater choice ofmore » design variables. It is shown that the desired form of performance may be achieved when the high-inductance axis of the reluctance part is arranged to lead the magnet axis by 90{degree} (elec.).« less
  • An indirectly coupled State Space-Finite Element (ICSS-FE) model of Axially Laminated Anisotropic (ALA) Synchronous Reluctance Motor (SynRM) drive systems is used to evaluate the impact of converter excitation on the machine performance characteristics., The model utilizes an iterative approach which includes the full impact of nonlinearities on the machine magnetic circuit, and which results in the nonsinusoidal flux waveforms in the different parts of the machine. The modeling approach is applied to a prototype ALA SynRM designed for use in hybrid vehicle applications.
  • This paper presents a Digital Signal Processor-based algorithm with an on-line parameter identification scheme for precision estimation of the rotor position and speed of a permanent magnet adjustable speed drive system by measuring stator currents, voltages and temperature. A modified d-q equivalent circuit model has been obtained to account for the core losses. Machine parameter variations due to saturation and temperature are included in the algorithm, which is valid for any speed, including zero speed. A simple hardware implementation to estimate the initial rotor position during the machine start-up and the implementation of position estimation algorithm, using a TMS320C25 DSP,more » is discussed. Because the estimation algorithm needs few instructions, it can easily be implemented in real-time vector control of permanent magnet synchronous drives. A complete vector-controlled drive system using an actively clamped resonant dc link inverter with the position estimator has been simulated, and results show that the estimated position is in close agreement with the actual rotor position of the machine.« less
  • For existing electric drives, the controller implementation is either totally analog or hybrid analog/digital, and the control algorithm broadly falls into two categories: Average Torque Control (ATC) and Instantaneous Torque Control (InsTC). In this paper, a fully digital implementation oriented control strategy--Incremental Torque Control (IncTC)--is proposed and verified with digital simulation. A TMS320C30 DSP based implementation of the proposed IncTC is developed and tested. Experimental results given in the paper indicate that the proposed IncTC is valid and holds a great promise for reluctance motor digital control.
  • This paper presents the results from laboratory tests on MagnaDrive Corporation’s fixed magnet, magnetically-coupled adjustable speed drive and Coyote Electronics electromagnetic, magnetically-coupled adjustable speed drive, compared to a typical variable frequency drive (VFDs) for fan and pump loads. It also discusses advantages and disadvantages of using mechanical magnetically-coupled adjustable speed drives versus variable frequency drives, and it provides field experience with VFDs in food storage as well as adjustable speed drives in wastewater and other field applications.