高密度车用永磁电机流固耦合传热仿真分析

摘要

为了准确分析高密度车用永磁电机的温升,解决流固交界面传热系数难以确定的困难,采用流固耦合仿真法,对电机热场进行仿真分析；并提出等效绝缘层法,以有效考虑电机槽绝缘、槽楔、导线绝缘及槽内空气隙对电机温升的影响.对一台48槽8极的车用永磁电机样机,在额定运行工况下,运用ANSYS Workbench软件中FLUENT模块仿真分析了其热场并对样机进行了温升试验.试验数据与仿真数据吻合较好,验证了该仿真分析方法的有效性和准确性.%In order to accurately analyze the temperature rise in the high density permanent magnet motor for vehicles and tackle the difficulty in the determination of the heat transfer coefficient on the fluid-solid boundary, the fluid-solid coupling method to simulate the thermal field in the motor and the equivalent insulation method to effectively consider the influence of the slot insulation and wedge, the conductor insulation and the in-slot air gap on the temperature rise of the motor were applied. A 48-slot 8-pole permanent magnet motor for vehicles under the rated operation condition was simulated for its thermal field with FLUENT module on ANSYS Workbench, and the temperature rise test was performed on it. The good agreement between the tested data and the simulated data verified the effectiveness and precision of the simulation approach.