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Optimal design of low-cost IPM AC motor

Jianxin Shen (Department of Electrical Engineering, Zhejiang University, Hangzhou, China)
Kang Wang (Department of Electrical Engineering, Zhejiang University, Hangzhou, China)
Dan Shi (Department of Electrical Engineering, Zhejiang University, Hangzhou, China)
Canfei Wang (Department of Electrical Engineering, Zhejiang University, Hangzhou, China)
Mengjia Jin (Department of Electrical Engineering, Zhejiang University, Hangzhou, China)
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Abstract

Purpose

The purpose of this paper is to present the optimal design of a low-cost interior permanent magnet (IPM) alternating current (AC) motor. It examines the influence of the permanent magnet (PM) materials, and proposes a simple and practical method of optimizing the air-gap field to achieve sinusoidal back electromotive force (EMF), and to reduce the cogging torque.

Design/methodology/approach

IPM AC motors with different magnet materials and various topologies are comparatively studied. Finite element method (FEM) is used to predict the performances of these designs. Material costs and manufacture costs are both taken into account. Finally, an optimized design is prototyped and tested, validating the design considerations.

Findings

In an IPM AC motor, even if the rotor outer profile is round, the air-gap field distribution can be fined, while the cogging torque can be significantly reduced, by properly shaping the stator tooth tips. Nevertheless, this technique is usually applicable to motor configurations with concentrated windings, but not to those with distributed windings.

Originality/value

While using ferrite magnets for PM AC motors with a kW power, interior magnets are usually inserted in V-shaped slots, and the rotor outer profile is often shaped in order to enhance the air-gap field distribution. However, such a rotor configuration usually increases the manufacture costs, and also deteriorates the consistency of mass production. Therefore, a new motor configuration with a round rotor outer profile and shaped stator tooth tips is proposed. It can not only overcome the aforementioned problems, but also improve the motor performance.

Keywords

Acknowledgements

This work was supported by the National Basic Research Program of China (2013CB035604), the Natural Science Foundation of China (51077116), and the China 973 Program (2011CB707204).

Citation

Shen, J., Wang, K., Shi, D., Wang, C. and Jin, M. (2014), "Optimal design of low-cost IPM AC motor", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 33 No. 5, pp. 1587-1598. https://doi.org/10.1108/COMPEL-09-2013-0292

Publisher

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Emerald Group Publishing Limited

Copyright © 2014, Emerald Group Publishing Limited

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