Abstract: The design of cooling runners has an important impact on the cooling performance of the motor, in order to study the cooling performance of parallel runners,the paper takes 135 kW permanent magnet synchronous motor as the research object, using the computational fluid dynamics (CFD) simulation method to analyze the impact of the number of parallel runners on the cooling performance of the motor, and comparing the differences in the cooling performance of the parallel runners and tandem runners, the results show that the number of circumferential parallel flow channels has obvious influence on the temperature field and velocity field of the motor shell. With the decrease of the number of flow channels, the maximum temperature of the inner wall of the shell decreases, the average flow velocity and velocity uniformity coefficient of the flow channel increase, and the inlet and outlet pressure of the flow channel increases, but the change range is small. Compared with the circumferential Z-series flow path, the inner wall temperature of the motor shell rises higher, but the temperature distribution is uniform. The average velocity is gentle and the coefficient of velocity uniformity is higher. The difference between import and export pressure is even lower, reduced by nearly five times.

Key words: Drive motor; Parallel runners; Cooling performance; Numerical simulation

摘要： 冷却流道的设计对电机冷却性能有重要影响，为研究并联流道的冷却性能，文章以 135 kW 永磁同步电机为研究对象，利用计算流体动力学（CFD）仿真方法分析了并联流道数 量对电机冷却性能的影响，对比了并联式流道和串联式流道冷却性能的差异。结果表明，周 向并联型流道数量对电机壳体温度场和速度场有明显的影响，随着流道数量的减少，壳体内 壁最高温度下降，流道平均流速和速度均匀性系数提升，流道进出口压力升高，但变化幅度 很小。周向并联型流道相比周向 Z 串联型流道，其电机壳体内壁温升更高，但温度分布均匀， 平均流速平缓，速度均匀性系数更高，进出口压力差更低，降低了近 5 倍。

关键词: 驱动电机；并联流道；冷却性能；数值模拟