关键词: 油冷, 永磁同步电机, 温度分布

Abstract: PMSM for passenger cars are developing towards small volume, high power density and high torque, and its operating environment is harsh. The temperature rise has become one of the key indicators for motor delivery assessment. A two-in-one motor with a reducer was taken as the research object. The motor was designed for oil cooling system according to the motor performance index. The oil cooling scheme was established and the internal heat source distribution of the motor was analyzed.The permanent magnet synchronous motor model was simplified reasonably, and the temperature field of the oil cooling model was analyzed by CFD, then the internal temperature distribution of the motor was obtained. The oil cooling motor test platform was built, and the calculated results were compared with the test results. The simulation values and experimental values of the temperature measurement points at the ends of the windings were compared and analyzed. The analysis results show that the calculation error was within 4%, which indicates that the motor oil-cooling structure was reasonable and the calculation results was accurately and the study method of temperature field was reliably,which could provide a good reference for the development and design of oil-cooling motors.

Key words: oil-cooling, permanent magnet synchronous motor, temperature distribution