Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Electromagnetic Structure Design Study of Fault-Tolerant Interior Permanent Magnet Machines for Electric Vehicles Using Harmonic Order Shaping

  • Liu, Guohai (School of Electrical and Information Engineering, Jiangsu University) ;
  • Zeng, Yu (School of Electrical and Information Engineering, Jiangsu University) ;
  • Zhao, Wenxiang (School of Electrical and Information Engineering, Jiangsu University) ;
  • Chen, Qian (School of Electrical and Information Engineering, Jiangsu University)
  • Received : 2016.09.03
  • Accepted : 2016.12.15
  • Published : 2016.12.31
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Abstract

Although pretty methods have been proposed to reduce torque ripple, they generally suffer from the decreased torque density. This paper will investigate the spoke-type interior permanent magnet (IPM) machine with shaping methods, including the sinusoidal (SIN), the inverse cosine (ICS), the sinusoidal with third harmonic (SIN+3rd), and the inverse cosine with third harmonic (ICS+3rd). In order to obtain low torque ripple and high torque density, the shaping method applied in rotor and stator at the same time, termed as the dual-shaping method, is proposed. This method is analytically derived and further confirmed by finite element method (FEM). It turns out that the ICS and ICS+3rd shaping methods are more suitable for outer rotors, while the SIN and the SIN+3rd shaping method should be used in inner stators. The original machine, the singular shaped machines and the dual-shaped machines on electromagnetic performances are compared for evaluation. The results verify that the dual-shaping method can improve torque density, whilst reducing torque ripple.

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