关键词: 驱动电机；并联流道；冷却性能；数值模拟

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