新能源商用车高转矩密度永磁同步电机设计

Design of the High-torque Density Permanent Magnet Synchronous Motor Used in New Energy Commercial Vehicles

采用有限元分析方法,设计了一款额定功率60kW的新能源商用车永磁同步电机。利用参数化分析方法,研究了定子槽深和隔磁桥厚度等关键尺寸对电机转矩密度的影响。对V字型转子磁钢的夹角进行了参数化寻优,以抑制磁场谐波含量并减小电机的转矩波动。样机主要性能参数的试验结果表明,该电机的有效转矩密度达到21.5N·m/kg,最高效率96.1%,且效率大于85%的高效运行区域占比达到89.6%。文章所述有限元参数化分析方法和电机关键结构参数优化方法,对提高电机转矩密度和扩大高效运行区间具有良好的效果。

A permanent magnet synchronous motor with rated power of 60 kW used in new energy commercial vehicles is designed by the finite element analysis method.The parametric analysis method is applied to research how the key dimensions such as stator slot depth and magnetic isolation bridge thickness to influence the motor torque density.In order to suppress the harmonic content of the magnetic field and reduce the torque ripple of the motor,the angle of the V-shaped rotor magnet is parameterized and optimized.The test results of main performance parameters of the prototype show that the effective torque density of the motor reaches 21.5 N·m/kg,the highest efficiency is 96.1%and the high-efficiency operation range where the motor’s efficiency greater than 85%occupies 89.6%of total.The finite element parametric analysis method and the optimization method of key structural parameters of the motor described in this paper have a remarkable effect in the fields of improving the torque density of the motor and expanding the efficient operation range of the motor.