大功率永磁同步发电机定子冷却系统优化分析

Optimal Analysis of Stator Cooling System of Large Power Permanent Magnet Synchronous Generator

为解决大功率永磁同步风力发电机发热问题,本文采用计算流体力学的方法对大功率永磁同步风力发电机定子冷却系统进行了优化分析。结果表明:水冷系统的冷却管外壁与铁心之间存在的管孔间隙是影响铁心温度不可忽略的因素,采用工业导热硅脂进行填充,会很大程度上减小冷却管与铁心之间的接触热阻,降低铁心与绕组温度;电机运行时温度较高,乙二醇很容易酸败,造成的危害不容忽视,采用抑制性乙二醇水溶液可以解决其酸败问题。

The stator cooling system of medium-speed permanent magnet synchronous wind turbine is optimized by computational fluid dynamics.The results obtained are as follows:The effect of the gap between the outer wall of cooling pipe and iron core is not negligible,and the thermal contact resistance is reduced when the gap is filled with thermal conductive silicone grease,causing reduction of the temperature of iron core and winding.On the premise that the pressure difference between the inlet and outlet of water cooling system is less than 3 bar,the cooling effect is better with the increase of the flow rate of refrigerant.The temperature of turbine is high when it works,and glycol is easy to be acidified,and this problem can be solved by using inhibitory ethylene glycol.