磁极偏移法抑制表面-内置式永磁转子同步电机齿槽转矩分析

Cogging torque suppression of surface-mounted and interior hybrid PMSM by magnet shifting method

针对所提出的表面-内置式永磁转子同步电机(SIHPMSM)结构特点,建立不同充磁方式下SIHPMSM的齿槽转矩解析模型。分析SIHPMSM磁极偏移状态下整体和单个磁极的齿槽转矩解析公式,得到磁极整体偏移和磁极分组偏移的齿槽转矩优化方法。采用有限元法计算SIHPMSM在不同充磁方式下磁极偏移时的齿槽转矩,与实验样机测试结果进行对比,得出最优的齿槽转矩优化方案。对比分析优化前后电机反电势、电磁转矩、转矩波动、效率等性能参数,验证了所采用优化方法的正确性与合理性。

This paper proposed the cogging torque analytical models of the surface-mounted and interior hybrid PMSM （SIHPMSM） with different magnetization patterns based on its structure. The optimization methods of cogging torque under whole and single magnetic pole migration were derived by analyzing the corresponding magnet shifting cogging torque analytical formulas. The finite element method was applied to calculate the cogging torque of SIHPMSM with different magnetization patterns when there was magnetic pole migration. Then the results were compared with those of prototype test and the cogging torque optimization method was determined, which was verified by comparing the results such as back-EMF, electromagnetic torque, torque ripple, efficiency and other performance parameters of the original, and optimized SIHPMSM.