Online from: 1982
Subject Area: Electrical & Electronic Engineering
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|Title:||Design issues of an IPM motor for EPS|
|Author(s):||C.F. Wang, (College of Electrical Engineering, Zhejiang University, Hangzhou, China and Department of Engineering Systems and Management, Cranfield University, Shrivenham, UK), J.X. Shen, (College of Electrical Engineering, Zhejiang University, Hangzhou, China), P.C.K. Luk, (Department of Engineering Systems and Management, Cranfield University, Shrivenham, UK), W.Z. Fei, (Department of Engineering Systems and Management, Cranfield University, Shrivenham, UK), M.J. Jin, (College of Electrical Engineering, Zhejiang University, Hangzhou, China)|
|Citation:||C.F. Wang, J.X. Shen, P.C.K. Luk, W.Z. Fei, M.J. Jin, (2012) "Design issues of an IPM motor for EPS", COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, Vol. 31 Iss: 1, pp.71 - 87|
|Keywords:||Electric power steering, Finite element analysis, Interior permanent magnet, Motor design, Road vehicles|
|Article type:||Research paper|
|DOI:||10.1108/03321641211184832 (Permanent URL)|
|Publisher:||Emerald Group Publishing Limited|
|Acknowledgements:||The first author gratefully acknowledges the internship supported by the Department of Engineering Systems and Management, Cranfield University, UK, to which this work relates. All authors would like to thank Nanyuan Electric Machinery Co., China for manufacture of the prototype machine, and MagneForce Software Systems Inc., USA for offering evaluation license of MagneForce V4.0.|
Purpose – The purpose of this paper is to present the design procedure of an interior permanent magnet (IPM) motor used in electric power steering (EPS), and some critical issues which have considerable impacts on the machine's performance are fully discussed before detailed sizing optimization.
Design/methodology/approach – The design specifications are derived according to application overall requirements. Critical issues which have considerable impacts on the machine's performance, such as operation mode, rotor structure and slot/pole combination, are analyzed based on literature review. The proposed machine is optimized, and the losses and efficiency are computed, using 2-D finite element analysis (FEA).
Findings – Before detailed sizing optimization, machine type selection is fully discussed. Aspects such as brushless ac (BLAC) operation mode, IPM rotor structure and combination of 12-slot/10-pole are quite suitable for EPS application. Consequently, a 12-slot/10-pole sinusoidally excited IPM machine with concentrated windings is selected, since it is convenient to obtain sinusoidal back electromotive force (back-EMF), minimum cogging torque and torque ripple, short end windings and high efficiency, as well as simple rotor assembly. The estimated excellent performance confirms that the proposed machine can be an attractive solution for EPS.
Research limitations/implications – The excitation current is ideal sinusoidal, while some harmonic components are neglected. Besides, in future, the experimental test should be carried out for validation.
Originality/value – A reasonable design procedure, where the motor type selection should be first addressed before detailed sizing design, is carried out. A 12-slot/10-pole sinusoidally excited IPM machine with concentrated windings is provided as a quite competitive candidate for EPS application.
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