U型永磁电机齿槽转矩优化方法研究

Research on cogging torque optimization method of U-type permanent magnet motor

针对齿槽转矩过大影响永磁同步电机稳定运行的问题,推导电机齿槽转矩表达式,研究主要影响因素,并提出利用转子表面开槽来削弱电机齿槽转矩的方法,以3相8极48槽U型内置式永磁同步电机为例,研究转子表面开槽的形状、偏移角度、宽度、深度等对电机气隙磁密谐波和齿槽转矩的影响规律,确定出最优开槽参数。优化后的开槽参数可有效降低内置式永磁同步电机齿槽转矩,削弱气隙磁密多次谐波,提高电机稳定性。

In order to solve the problem that the cogging torque is too large to the stable operation of permanent magnet synchronous motor(PMSM),the cogging torque expression of PMSM is derived,the main influencing factors are studied,and the method of reducing the cogging torque of PMSM by slotting the rotor surface is put forward,taking the 3-phase 8-pole 48-slot U-type built-in permanent magnet synchronous motor as an example,the effects of the slot shape,offset angle,width and depth on the air gap flux density harmonics and cogging torque of the motor are studied,the optimal slotting parameters are determined.The results show that the slotted parameters can effectively reduce the cogging torque,weaken the air gap flux density multi-harmonic,and improve the stability of the motor.