车用永磁同步电机不同冷却水道分析

Analysis of Different Cooling Channels for Vehicle Permanent Magnet Synchronous Motor

新能源汽车的永磁同步电机单位体积内损耗过大或冷却性能较差都可能造成温升过高,使得汽车的安全性及可靠性面临挑战,所以精准计算各项损耗并设计合理水道结构十分必要。针对额定功率为30 kW的永磁同步电机,利用流固耦合方法进行热仿真,分析螺旋形、轴向Z形、径向Z形及周向形四种水道的流速、压差、温升,探究电机冷却效果受不同冷却结构的影响及水泵功率的要求,为冷却结构的设计提供参考。

Excessive loss per unit volume or poor cooling performance of permanent magnet synchronous motor of new energy vehicles may lead to excessive temperature rise,which makes the safety and reliability of vehicles face challenges.Therefore,it is very necessary to accurately calculate various losses and design reasonable water channel structure.For the permanent magnet synchronous motor with rated power of 30 kW,the thermal simulation is carried out by using the fluid structure coupling method to explore the flow velocity,differential pressure and temperature rise of spiral,axial Z-shape,radial Z-shape and circumferential water channels,and explore the influence of different cooling structures on the cooling effect of the motor and the requirements of water pump power,so as to provide reference for the design of cooling structure.