Modularized stator permanent magnet motor cogging torque robustness evaluation method

The invention provides a cogging torque robustness evaluation method for a modular stator permanent magnet motor, and the method comprises the steps: firstly, obtaining two additional air gap length error combinations which may cause the maximum low-frequency cogging torque harmonic from the perspective of theoretical analysis through constructing a cogging torque harmonic vector analysis model of the modular stator permanent magnet motor; and the cogging torque peak-to-peak values corresponding to the two error combinations are used to evaluate the limit cogging torque performance and cogging torque robustness of the selected motor design scheme, so that the influence limit of the additional air gap length on the cogging torque performance can be effectively reflected. Meanwhile, the method is simple in calculation process and has remarkable advantages in the aspect of cost calculation compared with the prior art. 本发明提供了一种模块化定子永磁电机的齿槽转矩稳健性评价方法，首先通过构建模块化定子永磁电机齿槽转矩谐波矢量分析模型，从理论分析角度得到两种可能导致最大低频齿槽转矩谐波的附加气隙长度误差组合，