关键词: 永磁交流伺服电机, 齿槽转矩, 极弧系数, 磁极偏心, 有限元仿真

Abstract: Cogging torque is produced by the interaction between permanent magnet and slotted armature core in permanent magnet motor.Based on the energy method and finite element simulation, the influence of pole arc coefficient of permanent magnet pole on the cogging torque of the motor was analyzed and the optimal pole-arc coefficient was calculated and selected. The cogging torque was further reduced by adjusting the pole-arc center offset of the magnetic pole. The simulation results were compared with the prototype test data to verify the feasibility of the optimization scheme. The results show that the cogging torque can be effectively reduced by reasonably selecting the pole-arc coefficient and combining the center offset of magnetic pole.

Key words: permanent magnet AC servo motor, cogging torque, pole-arc coefficient, pole-arc center offset, finite element simulation