关键词: 轮辐式永磁同步电机, 齿槽转矩, 定子和转子偏心距, 定子和转子齿弧长, 多参数多目标

Abstract: Driven by technological innovations in rare-earth permanent magnetic materials, continuous improvements in motor manufacturing techniques, and growing market requirements, permanent magnet synchronous motors are finding progressively wider applications across various industries. The cogging torque existing between the permanent magnet and the iron core will cause the electromagnetic torque to pulsate. When designing the motor, it was necessary to minimize the cogging torque as much as possible. In order to weaken the cogging torque, the analytical method to derive the expression of cogging torque and analyzes the effectiveness of changing the stator-rotor eccentricity and the stator-rotor tooth arc length in reducing cogging torque. The finite element method was used to study a 12 slot 10 pole spoke-type PMSM, quantitatively studying the effects of stator-rotor eccentricity and stator-rotor tooth arc length on cogging torque. A response surface model was constructed and combined with the genetic algorithm to perform multi-parameter and multi-objective optimization of the cogging torque and torque ripple of the motor. The results show that simultaneously optimizing the stator-rotor eccentricity and the stator-rotor tooth arc length can significantly weaken the cogging torque and torque ripple of spoke-type PMSM.

Key words: spoke-type PMSM, cogging torque, stator-rotor eccentricity, stator-rotor tooth arc length, multi-parameter and multi-objective