It is crucial to design the suitable cooling system applied in electric machine for EVs. The heat dissipation has a great influence on the reliable operation of the motor in EVs. In the paper, the spiral channel cooling system is studied with three different dimension ratios (b/a=1,2,3) of inlet surface in computational fluid dynamics (CFD) simulation. Given the same area of inlet airflow, fluent parameters are compared in CFD, such as velocity, heat transfer coefficient and pump power, etc. The dimensional parameters are used for further thermal analysis of the completed machine by FEM coupling simulation. Finally, the images on the shell thermal distribution are recorded by infrared instrumentation, measurement results are determined by PT100 embedded in winding end. Experimental validation is presented in the paper, which could provide some reference for the research of cooling approach applied in motor for EVs.%车用驱动电机的合理冷却方式至关重要,直接影响电动汽车的运行稳定性.针对冷却方式中螺旋型水路进行详细的计算流体动力学(CFD)分析.在进水面积相同的条件下,针对方形截面的长宽比值不同进行分析,从流体流动迹线、散热系数、水泵功率、温度分布等多方面综合比较,总结散热特性规律为螺旋型冷却流体研究提供依据.通过有限元法(FEM)对螺旋水路的永磁电机进行温度场耦合分析,仿真给出电机整体温度场分布.最后,应用红外热成像仪测试样机机壳的温度分布,验证 FEM 温度场分布的一致性,并通过监测绕组端部 PT100温度,验证FEM仿真温度场精度,保证整车运行可靠性,为车用电机冷却散热的研究提供一些参考依据.
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