油水复合冷却下永磁同步电机温升特性

Temperature rise characteristics of a permanent magnet synchronous motor under oil-water compound cooling

针对某车用永磁同步电机绕组端部温度高、散热难的特点,采用在电机绕组端部增加喷油管的方法对油水复合冷却条件下的永磁同步电机的温升特性进行计算,研究永磁同步电机水冷和油水复合冷却对温升特性的影响。研究结果表明:增加绕组端部喷油管的油水复合冷却方案对电机冷却效果十分显著,电机绕组最高温度大幅度降低,高低温区温差较小,起到良好的温度均衡作用;且2种额定工况下,油水复合冷却方案较水冷方案下电机最高温度降低27℃,冷却效果较水冷方案提升20%、19%。

For the characteristics of a high temperature and difficulty in heat dissipation of the winding end of a vehicle permanent magnet synchronous motor,this paper calculates the temperature rise characteristics of the motor under oil-water compound cooling conditions by adding an oil injection pipe to the end of the motor winding.The effects of water cooling and oil-water compound cooling on temperature rise characteristics of a permanent magnet synchronous motor are studied.The findings indicate that,when combined with an oil injection pipe at the winding end,the oil-water compound cooling strategy significantly cools the motor.The maximum temperature of the motor winding significantly reduces,and the temperature difference between high and low temperature zones is small,which plays a good role in temperature balancing.Besides,under the two rated operating conditions,compared with the water cooling scheme,the maximum temperature of the motor reduces by 27℃in the oil-water compound cooling,with an improved cooling effect of 20%and 19%respectively.