车用永磁同步电机磁热耦合分析

Analysis of Magneto-thermal Coupling of Automotive Permanent Magnet Synchronous Motor

随着电动汽车对永磁同步电机性能的要求越来越高,进行该类电机的磁热耦合分析尤为必要。以一台40 kW物流车用永磁同步电机为研究对象,根据电机的结构参数在RMxprt中建立了电机的分析模型,利用有限元方法(FEM)分析电机的磁场,并计算电机的损耗。采用磁热耦合分析方法分析电机的温度场。将电机的损耗等效为电机温度场的热源,流固耦合仿真了该电机在额定工况下电机的温度场分布情况,为电机设计提供了重要的理论依据。

As electric vehicles have ever higher requirements for the performance of permanent magnet synchronous motors,it is particularly necessary to conduct a magnetic-thermal coupling analysis of this type of motor.This paper took a 40 kW permanent magnet synchronous motor for logistics vehicles as the research object.First,an analysis model of the motor was established in RMxprt according to the structural parameters of the motor,and the finite element method(FEM)was used to analyze the magnetic field of the motor and calculate the loss of the motor.The temperature field of the motor was analyzed by the method of magnetic-thermal coupling analysis.The loss of the motor was equivalent to the heat source of the temperature field of the motor,and the fluid-structure coupling simulated the temperature field distribution of the motor under rated conditions,which provided an important theoretical basis for the motor design.