关键词: 平行充磁表贴式永磁电机, 半闭口槽, 解析法, 气隙磁密, 齿槽转矩, 反电动势, 遗传算法

Abstract:

An analytical subdomain model was presented to compute the magnetic field distribution in semi-closed slots parallel magnetization surface mount PM brushless motor. Solving subdomains were permanent magnet, air gap, slot and groove. The boundary conditions were used to solve the two-dimensional Laplace equation or Poisson equation of each sub-domain in the polar coordinate system. The analytical results were in good agreement with the results obtained by the two-dimensional finite element method. Compared with the experimental waveforms, the back EMF calculation waveforms were in good agreement with that. The correct global analytical method was combined with genetic algorithm, and then the motor no-load performance was optimised. The results showed that the motor potential waveform was more sinusoidal and the cogging torque was reduced, which proved the validity of the model and provided method.

Key words: parallel magnetization PM motor, semi-closed slots, exact analytical method, air-gap magnetic, cogging torque, back-EMF, genetic algorithm