为了考察电机在装配螺旋槽水冷套时对转子的冷却效果,针对1台功率10 kW、额定转速90 000 r/min的超高速永磁电机,采用有限元方法对电机三维温度场进行了研究,考虑了定子铁损、定子铜损,转子铁损和转子风摩擦损耗的影响。结果表明:定转子小间隙内的空气对转子起到了类似“热密封”的作用,当转子损耗功率较大时,仅依靠螺旋槽水冷套并不能有效地冷却转子,还必需辅以定转子小间隙的强迫空气冷却,以进一步降低转子温度。研究结果为大功率高速永磁电机热设计提供了重要参考依据。

In order to check the cooling effect of the motor by using the spiral water jacket, a three-dimensional temperature field of the motor was studied by finite element method for a ultra-high speed PM motor with a rated 10 kW, 90 000 r/min considered stator iron loss, stator copper loss, rotor iron loss and rotor wind friction loss. The results showed that the air in the stator-rotor narrow gap seems to impose a heat sealed on the rotor. Therefore, it would not very effectively to cool the rotor with a significant loss power by the spiral water jacket only. Some additional cooling method, such as forced air cooling, should be applied in order to reduce the rotor temperature further. The results provideed an important reference for the thermal design of high power high speed PM motor.

TM 301.4+1

国家自然科学基金资助项目(51605380,11502196);中国博士后资助项目(2015M580865,2016M602842);西部地区博士后人才资助计划(2017M613291XB);陕西省教育厅资助项目(15JK1483,16JK1494);西安科技大学博士启动金(6310117013,2015QDJ039)