电动汽车用双层内置式永磁电机的设计与分析

永磁电机具有高效、高功率密度、高转矩密度等优点在车用驱动电机中得到广泛的关注。针对现有车用驱动电机的指标,分析车用永磁电机的工作原理,并设计一款100 kW双层内置式车用永磁驱动电机,利用有限元分析软件建立电机的二维有限元分析模型,分析电机的空载气隙磁密、反电势及齿槽转矩,初步验证了设计的合理性;在此基础上,计算电机的转矩电流特性、电机过载特性及转速-转矩特性,结果表明,所设计的电机的峰值转矩达1 100 N·m,电机的峰值转速可达9 000 r/min,弱磁扩速范围达到3倍以上,满足指标需求。

Design and Analysis of Double-deck Interior Permanent Magnet Synchronous Motor for Electric Vehicles

Permanent magnet motor has the advantages of higher efficiency, higher power density and higher torque density. With respect to indexes of existing driving motors, the working principle of permanent magnet (PM) motor for electric vehicles is analyzed, and a 100 kW double-deck interior permanent magnet synchronous motor (IPMSM) is designed. A 2-D finite element model is built based on ANSYS to calculate and analyze the air-gap flux density, cogging torque and back-EMF; meanwhile, the torque-current characteristics, overload characteristics and torque-speed characteristics are calculated. The results show that the peak torque can achieve 1 100 N·m, the peak speed can achieve 9 000 r/min, the range of weak flux is more than 3 times larger, and all the indexes can meet the needs for motor design.