新能源汽车用电机对大小及质量的要求严格,具有功率密度高、质量轻、体积小、内部结构紧凑等特点,故不可避免会产生较大的散热压力,因此带水套的液冷电机成为主流形式。如何建立电机内部与壳体之间高效的导热通道,是限制电机性能的重要问题之一。运用电机灌封技术在定子槽内绕组以及端部绕组处填充热导率相对较高的灌封胶,以提高绕组的导热效率。利用流体仿真的方法对灌封后的电机流场以及温度场进行研究,与未灌封电机对比,利用现有的试验平台,对仿真结果进行验证。结果表明:电机灌封后有效的改善了端部绕组以及槽内绕组的散热条件,降低了端部与槽内的温度梯度,电机绕组的最高温度下降了22 K,效果较为显著。

Due to the strict requirement of small size and light weight, the motors used in new energy vehicle had the characteristics of high power density, light weight, small volume and compact structure, which inevitably had a significant influence on the heat dissipation of motors. Thus, the motors cooled by water jacket had emerged as a mainstream, but how to set up the efficient heat conduction passage from the internal motor to the shell was still one of the important problems restricting the motor performance. In order to improve the thermal conduction efficiency of windings, the potting gum with relatively higher thermal conductivity was filled into the stator slot winding and the end winding. The fluid field and temperature field of the potting motor and the unpotted motor were studied using the method of fluid simulation. The simulation results were verified by experiment using the existing experimental platform. The results showed that the heat dissipation condition of the end winding and the winding in the slot is improved effectively after the motor was potted, the temperature gradient between the end winding and the slot winding was reduced, and the maximum temperature of the motor winding was reduced by 22 ℃.

TM 301.4