撑块变化对凸极同步电动机热流场影响

Effect of variation of support blocks on thermal and fluid flow field of salient pole synchronous motor

针对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的显著问题,研究了凸极电机典型部件撑块布置对电机热流场的影响。在满足强度要求的前提下,以国内较大容量的40 MW空冷凸极同步电动机为研究对象,采用基于计算流体动力学(computational fluid dynamics,CFD)原理的有限体积法,求解三维湍流流动及传热控制方程,得到三撑块布置下,整机1/8三维流场及转子温度场分布特点,对比分析了撑块不同结构、数量和相对位置下的流量分布特点以及转子固体部件温度分布规律。结果表明,端部第一撑块位置后移,更利于定子部分的冷却。结论可为大容量凸极电动机通风系统结构设计提供参考和指导。

Aiming at the increasing unit capacity of motor,and electromagnetic load increases leading to the obvious rise of internal heat in motor,in order to study the effect of the arrangements of support block that is a key component of salient pole synchronous motor on thermal and fluid field, large capacity 40MW air cooling salient pole synchronous motor was taken as the research object. Three-dimensional turbulent flow and heat transfer governing equations were solved with finite volume method based on com-putational fluid dynamics. The distribution characteristics of 1/8 three-dimensional flow and temperature field of rotor were obtained with three support blocks arrangement meeting the requirement of strength. Distribution characteristics of cooling air flow rate and temperature of solid rotor parts were analyzed com-paratively to different structure, quantity and relative position of support block. The results show that the support block near end is moved backward,which is better to cool stator parts. The conclusion provides reference and guidance for the ventilation system design of high-capacity salient pole motor.