大功率永磁同步电机温升研究

Research of Temperature Rise on High-Power Permanent Magnet Synchronous Motor

本文围绕一台200kW纯电动汽车用大功率永磁同步电机,首先建立电机温升数值计算模型并计算了峰值工况温升时间;其次建立电机温升有限元仿真模型,计算得到峰值工况温度场及运行时间;再次研究了不同热负荷下采用数值计算方法和有限元仿真方法计算峰值工况温升时间差异,并对数值计算方法进行了修正;最后搭建电机温升实验台架,得到峰值工况电机实测温升时间。结果表明,修正后的数值计算方法、有限元仿真方法均与实测误差较小,两种方法具有一定的准确性。

This paper took a 200 kW high-power PMSM in pure electric vehicle as an example, firstly, established a numerical calculation model for the temperature rise of the motor and calculated the temperature rise time under peak conditions;secondly,established the finite element simulation model of motor temperature rise and calculated the temperature field and running time under peak conditions;afterwards, studied the difference in calculating temperature rise time under peak conditions using numerical calculation methods and finite element simulation methods under different heat loads, and then modified numerical calculation method;finally, built the motor temperature rise experiment bench, obtained the measured temperature rise time of the motor under peak conditions. The results show that both revised numerical calculation method and finite element simulation method have small errors with the actual measurement,which means the two methods have certain accuracy.