电动汽车用永磁同步电机散热设计与仿真试验

Heat Dissipation Design,Simulation and Test of Permanent Magnet Synchronous Motor for Electric Vehicle

通过热管传热技术快速导出端部绕组的热量,实现电机温升的降低,是解决电动汽车电机高功率密度问题的途径之一。设计了热管装配工艺,利用ANSYS Fluent对2种电机进行有限元模型建立和温度场仿真计算,并制作样机进一步试验。试验结果表明:仿真结果与样机测试结果相近,高温区域位于绕组端部,装有热管的冷却系统电机设计能够有效地降低电机温升。

Aiming at the heat dissipation requirements of high power density electric vehicle motor,a cooling solution of motor based on heat pipe is proposed.Through pipes,the heat can be transmitted rapidly from the end winding to housing.It is one of the effective ways that can solve the problem of high-power density on motor.The heat pipe assembling technique is designed.Using the ANSYS Fluent software,the finite element models are established for both the original motor and the heat-pipe-based motor,and temperature field simulation is carried out.Tests between the original motor and the heat pipe-based motor are established.Prototype test results are similar to the simulation results.It is found that the high temperature region of the permanent magnet synchronous motor is mainly located at the end of the winding.Simulation and test show that the design of the cooling system based on the heat pipe can effectively reduce the temperature rise of the motor winding.