感应交流电机冷却系统模拟及冷却风扇优化

Simulation Analysis on Induction Alternator Cooling System and Cooling Fan Optimization

运用CFD(computational fluid dynamics)软件ANSYS的Fluent 15.0模块,以某感应交流电机为例,使用流固耦合的方式分析其冷却系统在额定工况的流场分布。通过冷却风扇叶片间的流动分布状况,定、转子通风槽内部流动分布状况及主要发热部件的表面温降状况,对电机冷却系统的散热性能进行评价。最后基于增大流量的优化思路,通过改变冷却风扇出口角的方法对冷却系统进行优化设计,并将优化前、后冷却系统散热性能进行比较分析。结果为当冷却风扇出口角为45°时,电机冷却系统换热性能更好。

According to the way of fluid-structure coupling,the Fluent15.0 module of CFD(computational fluid dynamics)software ANSYS was used to analyze the flow field distribution of the cooling system of a sample induction AC motor under rated conditions.Through the flow and distribution between cooling fan blades,the flow distribution inside stator and rotor ventilation grooves and the surface temperature drop of main heating parts,the heat dissipation performance of motor cooling system is evaluated.Finally,based on the optimization idea of increasing the flow rate,the cooling system is optimized by changing the outlet angle of the cooling fan.At the same time,the heat dissipation performance of the cooling system before and after optimization is compared and analyzed.The conclusion is that the cooling system achieves better heat transfer efficiency when the outlet angle of the cooling fan is 45°.