三相无刷同步发电机转子绕组不同连接方式可靠性分析

Reliability Analysis of Different Connection Methods of Rotor Winding forThree-Phase Brushless Synchronous Generator

电励磁三相无刷隐极同步发电机可通过改变励磁绕组电流大小改变气隙磁场强度,从而实现宽范围电压调节。转子绕组是三相无刷隐极同步发电机的重要组成部分,其一般采用同心式绕组。并联支路数为1的转子绕组极间、重间连接后,引出线正端与负端在铁心端面固定并直接引出。而并联支路数大于1的转子绕组不仅需要极间、重间连接,还需选择恰当的并联连接方式。不同的连接方式直接影响转子绕组的复杂性与可靠性。以10极5 MW三相无刷隐极同步发电机为例,对并联支路数为2的转子绕组不同连接方式进行比较。结合工艺性与可操作性,选择最优转子绕组连接方式,制作了发电机转子绕组以及样机。结果表明,该连接方式简单可靠,可提高产品工艺性,有效避免转子绕组绝缘故障。

Electro-excited three-phase brushless hidden pole synchronous generator can change the air-gap magnetic field strength by changing the magnitude of excitation winding current,thus realizing wide-range voltage regulation.Rotor winding is an important part of three-phase brushless hidden pole synchronous generator,which generally uses concentric winding.After the rotor winding with a parallel branch number of one is connected between pole and pole and between coil and coil in same pole,the positive end and negative end of the lead line are fixed on the end face of the iron core and directly led out.The rotor winding with a parallel branch number more than one not only needs to be connected between pole and pole and between coil and coil in same pole,but also needs to select the appropriate parallel connection methods.Different connection methods directly affect the complexity and reliability of the rotor winding.Taking a 10 pole and 5 MW three-phase brushless hidden pole synchronous generator as an example,the different connection methods of rotor winding with two parallel branches are compared.Combining the manufacturability and operability,the optimal connection method of rotor winding is selected,and the generator rotor winding and prototype are manufactured.The results show that this connection method is simple and reliable,which can improve the product manufacturability and effectively avoid the insulation faults of rotor winding.