永磁同步电机转子涡流损耗优化及温升分析

Optimization of Rotor Eddy Current Loss and Temperature Rise Analysis of Permanent Magnet Synchronous Motor

为解决永磁同步电机转子涡流损耗引起的转子温度高、永磁钢退磁等问题,建立转子涡流损耗解析表达式,分析影响参数,并以3相8极36槽V型IPMSM为例,研究定子槽口宽度、气隙长度、转子偏心距、定子斜槽角度等参数对转子涡流损耗的影响规律,完成最优参数匹配。研究结果表明,优化后的转子结构能够有效削弱电机主气隙磁密的高次谐波,从而减少涡流损耗、降低转子温度,提高电机输出性能。

In order to solve the high rotor temperature caused by eddy current loss,the permanent magnet demagnetization risk.The magnetic field that causes the rotor eddy current loss was analyzed theoretically.Taking the 3-phase 8-pole 36-slot V-type IPMSM as an example,the Ansys finite element method was used to study the rotor eccentricity,air gap length,stator slot width,and stator skew angle.The influence law of the rotor eddy current loss was based on reducing the high-order harmonics of the magnetic density of the motor rotor surface to determine the best parameter matching.The two-way coupling simulation method of electromagnetic field and thermal field was adopted,and the motor losses before and after optimization were input into the temperature rise calculation model to obtain accurate motor rotor temperature distribution.The results show that the optimized rotor structure can effectively weaken the high-order harmonics of the main air gap flux density,reduce the eddy current loss,reduce the rotor temperature and improve the output performance of the motor.