转子有辅助槽的表贴式永磁电机解析法建模与优化

通过在表贴式永磁电机的的转子上开辅助槽,可间接改善电机的齿槽转矩脉动状况.但目前相关文献大都基于有限元法,需要反复修改模型参数,且尚未得出明确的槽型优化方法.本文选取磁场中的标量磁位为求解变量,在电机的气隙区域、永磁体区域分别建立拉普拉斯和准泊松方程.对于不规则的永磁体形状,采用分块累加方法,提出了一种转子含有半圆形辅...

Analytical modeling and optimization of a surface-mounted permanent magnet machine with auxiliary slots in rotor

The cogging torque ripple of surface mounted permanent magnet motor can be reduced by opening auxiliary slots on the rotor.However,the analyses are mainly based on the finite element method,which requires repeated modification of the parameters of the model,and there is no clear method to optimize the geometry.In this paper,taking the scalar magnetic potential as variable,the Laplace and Quasi Poisson equations were established in the air gap and permanent magnet region respectively.For the irregular shape of magnet,an analytical model of surface-mounted permanent magnet motor with auxiliary slots in the rotor was proposed based on the principle of superposition.Then,the relationship between the peak cogging torque and the auxiliary slot size was derived.The auxiliary slot size was optimized and the cogging torque was minimized.Finally,the finite element method was used to validate the presented analytical model.