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JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
    
Analytical calculation model and ripple characteristics analysis of torque in permanent magnet synchronous motor for electric vehicles
ZUO Shu guang, LIN Fu, WU Xu dong
Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China
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Abstract  

An analytical torque model accounting for nonsinusoidal permanent magnet field and current harmonics was presented in order to analyze the characteristics of torque ripple in permanent magnet synchronous motor (PMSM) with different slot pole combinations (SPC) and winding layers. Firstly, armature reaction field of PMSM with different SPC was derived according to the winding distribution. Then, after solving the air gap field, Maxwell stress tensor method was used to obtain the tangential force wave and electromagnetic torque was acquired by integrating the tangential force wave long the circumference. Finally, finite element method (FEM) and experiments were used to validate the analytical model and the prediction of torque ripple frequency. The theoretical analysis and test results showed that 6ith harmonic components of torque ripple were produced by the nonsinusoidal permanent magnet field. (1-h)th and [6i±(1-h)]th harmonic components were produced by current harmonics whose frequencies were h times fundamental current frequency.



Published: 15 October 2015
CLC:  TM 301  
Cite this article:

ZUO Shu guang, LIN Fu, WU Xu dong. Analytical calculation model and ripple characteristics analysis of torque in permanent magnet synchronous motor for electric vehicles. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2015, 49(9): 1731-1737.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008 973X.2015.09.016     OR     http://www.zjujournals.com/eng/Y2015/V49/I9/1731


车用永磁同步电机转矩解析模型和波动特性分析

为了分析不同极槽配合和绕组层数永磁同步电机的转矩波动特征,提出一种考虑永磁体磁场非正弦分布和电流谐波的转矩解析计算模型.根据绕组分布推导不同极槽配合(SPC)电机的电枢反应磁场.在气隙磁场求解的基础上,根据麦克斯韦应力张量法获取切向力波,将切向力波沿圆周积分获取电磁转矩.通过有限元法(FEM)和转矩测量实验验证转矩解析模型和波动特性预测的准确性.理论分析和实验结果表明:永磁体磁场非正弦波分布引起6i阶的转矩波动,而电流基频h倍的电流谐波产生1-h阶和6i±(1-h)阶的转矩波动.

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