某纯电汽车永磁同步电动机热流固耦合数值模拟  

Numerical simulation of an electric vehicle permanent magnet synchronous motor with thermal-fluid-solid coupling method

作　　者：李丹丹 毛金龙 唐城琨 LI Dandan;MAO Jinlong;TANG Chengkun(Geely Auto Research Institute(Ningbo)Co.,Ltd,Ningbo,Zhejiang 315336)

机构地区：[1]吉利汽车研究院(宁波)有限公司,浙江宁波315336

出　　处：《电气技术》2024年第12期42-49,共8页Electrical Engineering

摘　　要：采用热流固耦合数值仿真方法对某纯电汽车用水冷扁线永磁同步驱动电机进行峰值扭矩和额定转速工况下的热负荷预测。其中,峰值瞬态工况采用多参考坐标系(MRF)定义旋转,结合周向热通量平均算法,大幅提高了计算速度,且仿真结果与试验结果基本一致。仿真结果表明,峰值工况和额定工况下,电动机冷却水套进出口温差分别为2.8K和4.0K;定子线圈及转子磁钢的最高温度均满足相应耐温设计指标,表明冷却液的质量流量和电动机水套设计合理;不同于额定工况,峰值工况下各零部件的大部分热量均用于自身温度升高,但传热路径基本一致,主要传热路径均为定子线圈→绝缘纸→定子铁心→水套外壳体→冷却液,在温度场达到稳定时此路径传出的热量占总产热量的96%以上。Thermal load of an electric vehicle water-cooled permanent magnet synchronous motor(PMSM)with hairpin windings is evaluated using thermal-fluid-solid coupling numerical simulation method,and the thermal load at peak torque point and rated speed point is predicted.The rotor speed is defined using multiple reference frame(MRF)combining with the circumferential heat flux averaging method which could greatly shorten the time of calculation.And the simulation results are basically consistent with the test data.The simulation results show that,at peak and rated work points,the temperature difference between inlet and outlet of cooling jacket is 2.8℃and 4.0℃respectively.The highest temperature of stator windings and rotor magnet can meet the relevant temperature-resistant design restrict,which indicates that the coolant mass flow rate and the motor cooling jacket designation is reasonable.Different from the rated speed point,most of the heat of each component at peak torque point is used for its own temperature rising,but the heat transfer path is similar,the main path is from stator winding to insulating paper,stator core,water jacket shell and coolant.While the temperature field is stable,the heat transferred from this path accounts for more than 96%of the total heat generation.

关 键 词：纯电汽车 永磁同步电动机(PMSM) 热流固耦合 数值仿真 热负荷 

分 类 号：TM341[电气工程—电机] U469.72[机械工程—车辆工程]