非晶转子再制造电机齿槽转矩研究及优化

Research and Optimization of Cogging Torque of Amorphous Rotor Remanufactured Motor

为提升电动汽车用永磁电机性能,用低损耗非晶转子代替原电机硅钢转子。基于磁路模型,推导了考虑转子磁导的气隙磁密表达式,研究了转子磁导率、转子径向厚度、气隙长度对齿槽转矩的影响。通过仿真计算,分析了再设计转子的偏心深度和磁极夹角对再制造电机性能的影响,提出了非晶转子磁极夹角-偏心外圆组合再设计方法。结果表明,相比原电机,优化后再制造电机的齿槽转矩降低了22%,输出转矩提高了0.5 Nm,铁耗降低了20 W,效率提高至97.72%,性能获得明显提升。

In order to improve the performance of permanent magnet motor for electric vehicles,the low-loss amorphous rotor was used to replace the original motor silicon steel rotor.Based on the magnetic circuit model,the air gap magnetic density expression considering rotor magnetoresistance was derived.The effects of rotor permeability,rotor pole length and air gap length on cogging torque were studied.Through the finite element simulation calculation,the effects of redesigned eccentric depth and redesigned magnetic pole angle on the performance of remanufactured motors were analyzed respectively.The combined redesign method of the angle of the amorphous rotor magnetic pole-eccentric outer circle was proposed.The results show that compared with the original motor,the cogging torque of the optimized remanufactured motor is reduced by 22%,the output torque is increased by 0.5 Nm,the iron loss is reduced by 20 W,the efficiency is increased to 97.72%,and the motor performance is significantly improved.