内置式永磁电机齿槽转矩的产生及削弱分析

A Method to Analyze and Reduce Cogging Torque in IPMSM

基于麦克斯韦应力张量法利用有限元工具进行了整数槽结构内置式永磁电机齿槽转矩的分析,分析了齿槽转矩在转子外圆上的时空分布特点与规律,从比较直观的角度阐述了齿槽转矩的产生原因,并且提出了利用波形抵消来优化永磁体宽度以削弱齿槽转矩基波及其高次谐波的方法。

Reducing cogging torque is one of the key points of optimal design of IPMSM, at present, the cog- ging torque in SPMSM was analyzed a lot, but not IPMSM. The main reason is that the magnetic circuit of IPMSM is more complicate, the expression of which is not easy to derivation. This dissertation used the Max- well stress tensor method to analyze the cogging torque instead of the conventional virtual displacement energy method, analyzed the distribution and the principle of production of cogging torque in a intuitive point of view by using the Maxwell tensor method and FEA software, this dissertation advanced a method to reduce cogging torque and its harmonics by optimal design of the width of magnet at the end.