电动汽车驱动电机绕组端部喷淋冷却温度场分析

Temperature Field Analysis of Winding End Spray Cooling ofElectric Vehicle Drive Motor

电动汽车驱动用永磁同步电机(PMSM)具有功率密度高、质量轻、体积小、内部机构紧凑等特点。因此,电机内部散热压力较大,若不能及时有效地散热,会产生严重的温升问题,限制电机功率。针对PMSM绕组端部发热严重的问题,采用喷淋冷却的方式,通过将冷却介质离散化,分析了不同喷嘴、不同流量和不同喷淋位置下的冷却效果和流体运动情况。选择合理的喷淋形式与喷淋流量后,将喷淋冷却与水冷电机绕组端部的温度场进行比较。分析结果证明了喷淋冷却的有效性,为后续的电动汽车驱动电机的喷淋冷却研究提供了一定的参考。

The permanent magnet synchronous motor(PMSM)for electric vehicle drive has the characteristics of high power density,light weight,small size and compact internal mechanism.Therefore,the internal heat dissipation pressure of the motor is high,if the heat is not dispersed effectively in time,it will cause a serious temperature rise problem and limit the power of the motor.Aiming at the serious heat problem at the PMSM winding end,the cooling effect and fluid movement are analyzed under different nozzles,different flow rates and different spray positions by using spray cooling method and discretizing the cooling medium.After selecting a reasonable spray form and a spray flow rate,the temperature fields of the winding end of the spray cooling and water cooling motor are compared.The analysis results prove the effectiveness of spray cooling and provide a reference for the future research on spray cooling of electric vehicle drive motor.