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最近10年,世界各地水电站平均每年订货容量超过20000MW,新电站建设速度加快,尤其是在中国。其中,包括许多装有200MVA～800MVA机组的大型发电站。对大容量水轮发电机来说,某些情况下,定子和转子绕组已采用直接水冷技术。然而从机组结构简单和易维护的观点来看,空冷型式更为适合,近年来,空冷型机组得到更多关注。在低速情况下,考虑到工地运输的限制,大尺寸发电机部件可以采用工地焊接结构。在中国,不仅建有采用立式机组的大型水电站,而且建设有采用卧式灯泡式水轮发电机组的低水头电站。最近,单机容量30MW～45MW的大型灯泡式水轮发电机已投入运行,轴承及发电机冷却的新技术将推广用于灯泡式水轮发电机。在抽水蓄能电站中,第一个调速抽水蓄能系统1990年在日本投运,以后这种系统已运用于多个抽水蓄能电站,尤其是在日本和欧洲。在调速抽水蓄能发电电动机中,针对离心力作用的转子线圈端部支撑结构是一项目前仍在不断改进的重要技术。
In the recent 10 years, the average annual capacity of hydropower stations around the world has exceeded 20000MW, and the construction of new power stations has accelerated, especially in China. Among them, many large power stations with 200MVA ~ 800MVA units are included. For large capacity hydrogenerators, in some cases direct cooling of the stator and rotor windings has been used. However, from the point of view of the simple structure and easy maintenance of the unit, the air-cooled type is more suitable. In recent years, air-cooled type units have received more attention. At low speeds, large-size generator components can be welded at work sites, taking into account site transport constraints. In China, not only has a large hydropower station with vertical units been built, but also a low-head hydropower station with a horizontal bulb-type hydro-generating unit has been built. Recently, a large bulb-type hydroelectric generator with capacity of 30MW to 45MW has been put into operation. The new technology of bearing and generator cooling will be applied to bulb type hydrogenerators. Among the pumped storage power plants, the first pumped storage system was put into operation in Japan in 1990 and has since been used in several pumped storage plants, especially in Japan and Europe. In speed regulating pumped storage generator motor, the structure of rotor coil end support for centrifugal force is an important technique which is still under continuous improvement.