内置V型永磁电机齿槽转矩优化

Built-in V Permanent Magnet Motor Cogging Torque Optimization

针对内置V型永磁电机齿槽转矩的问题,对齿槽转矩产生的原因进行分析,通过结合不均匀气隙结构和隔磁桥的方法降低齿槽转矩。首先,通过齿槽转矩表达式分析了不均匀气隙和隔磁桥可以降低齿槽转矩;其次,通过优化参数Rib和HRib找到了最优的隔磁桥结构,齿槽转矩峰值由1.30 N·m降低到0.36 N·m,降低了72.3%,在最优隔磁桥结构的基础上通过有限元仿真计算找到了最优的不均匀气隙结构,齿槽转矩峰值由0.36 N·m降低到0.21 N·m,降低了41.7%;最后,分析结合不均匀气隙结构和隔磁桥结构后对电机其他性能的影响,空载气隙磁密和空载反电势谐波畸变率基本不变,转矩脉动由25.5%降低到20.4%,降低了5.1%,说明优化后不会对电机其他性能产生影响。

Aiming at the problem of cogging torque of built-in V-type permanent magnet motor,the causes of cogging torque were analyzed in this paper,and the cogging torque was reduced by combining non-uniform air gap structure and magnetic separation bridge.Firstly,by analyzing the expression of cogging torque,we found that the non-uniform air gap and magnetic separation bridge can reduce the cogging torque.Secondly,the optimal magnetic separation bridge structure was found by optimizing the parameters Rib and HRib,and the peak torque of the cogging,was reduced from 1.30 N·m to 0.36 N·m,which was reduced by 72.3%.Based on the optimal magnetic separation bridge structure,the optimal non-uniform air gap structure was found through finite element simulation calculation.The peak value of cogging torque,was decreased from 0.36 N·m to 0.21 N·m,decreased by 41.7%.Finally,other performance of motor was analyzed when the motor has optimal influence of non-uniform air gap structure and magnetic bridge structure.The magnetic density of non-load air gap and harmonic distortion rate of non-load back potential were almost unchanged,and the torque ripple is reduced by 5.1%from 25.5%to 20.4%.