某凸极同步电动机三维流场数值模拟

3D flow field numerical simulation of some salient synchronous motor

为得到某凸极同步电动机定转子与磁极间隙内通风冷却空气的流动特点,建立主机1/8包括定子、转子的通风系统三维物理模型,并给出求解域相应的边界条件。应用计算流体力学(CFD)流体计算软件Fluent对三维湍流时均流场控制方程进行数值求解计算,得到凸极电机通风系统内空气速度与静压分布特点,并着重对转子磁极间隙、定子径向通风沟内流体流动特点进行分析。结果表明,定子前部风沟内空气流量小,压指间空隙内空气流量大,占总风量的26%,对于降低定子峰值温度有利,电机内定子、转子间隙等各部分流量分配较合理。

In order to obtain the flow characteristics of cooling air in the stator,rotor and the magnetic pole gap of some salient motor,the 1/8 structure of whole motor was established,including three-dimensional physical model of the ventilation system of stator and rotor.The three-dimensional turbulent governing equations of time-averaged flow field were calculated numerically by the Fluent software for（computational fluid dynamics,CFD） calculation based on some corresponding boundary conditions.Distribution characteristics of air velocity and static pressure in salient motor ventilation system were received and fluid flow characteristics of rotor pole gap and stator radial ventilation ducts were mainly analyzed.The result shows that air flow rate inside the ventilation ducts in front of the stator is small and the air flow which accounts for 26% of the total air flow rate inside the pressure finger gap is large,which is beneficial to reduce stator peak temperature,and flow distribution of each part in the motor such as stator and rotor gap is reasonable.