基于灌封材料的永磁同步电动机热管理策略研究

Research on Thermal Management Strategy of Permanent Magnet Synchronous Motor Based on Potting Material

永磁同步电动机(PMSM)的散热是电动汽车亟待解决的问题之一。针对PMSM散热问题,将灌封的硅凝胶封装在PMSM的端绕组与外壳之间的间隙中,以此作为PMSM的热管理策略。系统的温升测试表明,在相同的冷却条件下,采用灌封硅凝胶(P-M)的PMSM在任何工作条件下均具有比原始PMSM(O-M)更低的稳定运行温度,最大降温达到27.3℃,比O-M低23.6%。此外,P-M在峰值负载条件下的稳定运行时间延长了约两倍,从84 s改善到165 s。计算流体动力学(CFD)模型显示了电动机的温度分布,该模型与测试结果显示出良好的一致性,并准确预测了在峰值负载条件下的稳定运行时间。

The heat dissipation of permanent magnet synchronous motor(PMSM)is one of the problems that need to be solved in electric vehicles.For the PMSM heat dissipation problem,the potted silicone gel was encapsulated in the gap between the end winding of the PMSM and the outer casing as a thermal management strategy for the PMSM.The systematic temperature rise tests showed that the PMSMs with potting silicon gelatin(P-M)had a lower stable operation temperature than the original PMSMs(O-M)at any working condition when the same cooling conditions were applied,and the maximum temperature decrease reached 27.3℃,which was 23.6%lower than the O-M.Furthermore,the stable operation time of the P-M under the peak-load condition has been about twofold extended with an improvement from 84 s to 165 s.The Computational Fluid Dynamics(CFD)model shows the temperature distribution of the motor.The model shows good agreement with the test results and accurately predicts the stable running time under peak load conditions.