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目前各电站运行的同步发电机,属于直流机励磁方式的仍占多数。这种机械整流式的直流励磁机存在着维护工作量大,整流子经常发生火花,噪音大和直流机励磁系统的动态响应较差、满足不了电网稳定运行要求等缺点。根据四川省雅安水电厂统计,一台直流励磁机一般只能正常运行7～8年,此后则每隔2～3年要车整流子一次,车一次整流子至少得停产7、8天。对地处山区的小水电站则困难更多。为此,对直流机励磁方式进行改造显得十分必要。改造直流机励磁方式的途径有二:一是改造成旋转半导体的无刷励磁;二是改造成静止半导体励磁。当直流励磁机与发电机是同轴时,以选用无刷励磁方
At present, synchronous power generators operating in various power stations belong to the majority of DC excitation modes. The mechanical rectifier DC exciter has the disadvantages of large maintenance workload, frequent sparks of the commutator, large noise and poor dynamic response of the excitation system of the direct current machine, which can not meet the requirements of the stable operation of the power grid. According to Ya’an hydropower plant in Sichuan Province statistics, a DC exciter generally only normal operation for 7 to 8 years, then every 2 to 3 years to car commutator once the car once the commutator at least have to stop production for 7,8 days. It is more difficult for small hydropower stations located in mountainous areas. For this reason, it is necessary to reform the excitation method of DC machine. There are two ways to transform the excitation mode of DC machine: one is to transform brushless excitation into rotating semiconductor; the other is to transform into static semiconductor excitation. When DC exciter and generator are coaxial, brushless exciter should be used