凸极电机定子风路变化对热流场影响

随电动机单机容量不断增大,电磁负荷随之提高,电机内部发热量增长显著,通风方案设计将影响峰值温度的数值,对冷却效果起决定性作用。为降低峰值温度,确保电机安全稳定运行,本文以某空冷凸极同步电动机为研究对象,基于计算流体动力学(CFD)原理,采用有限体积法,求解三维湍流流动控制方程组,得出定子绕组不同冷却风路布置方案设计情况下的三维流场及温度场的分布特点,分析了定转子各部分风路中空气流量分布特点以及定转子固体部件温度分布情况,得出冷却效果较好的定子空气冷却风路布置。结果表明,凸极电机定子铁心段绕组空气冷却风路布置影响定子绕组峰值区域及数值大小。结果可为大容量凸极电动机通风系统结构设计提供参考。

Effect of the stator ventilation ducts changes on thermal and flow field of salient synchronous motor

With the motor unit capacity increasing , the electromagnetic load improves , and the internal heat source of motor grows significantly .The ventilation scheme design which plays a decisive role for the cooling effect of the motor ,will affect the magnitude of the peak temperature .In this paper ,an air-cooled salient pole synchronous motor was taken as an example to reduce the peak temperature and ensure the safe and stable operation of the motor .Based on the principles of computational fluid dynamics (CFD), the finite volume method was adopted to solve the control equation for three-dimensional turbulent flow and heat transfer .The three dimensional flow field and the temperature field distribution characteristics under different design proposals of cooling air duct arrangement for stator were obtained .The volume flow rate distribution characteristics and temperature distribution in the solid part of the rotor and stator were analysed and a better cooling air duct arrangement for stator was obtained .The results show that air duct arrangement in the stator bar division directly determines the region of position and magnitudes of the peak temperature of the stator windings .The results can provide a reference for ventilation system design of large-capacity salient motor .