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随着大容量、高转速水轮发电机的出现,运行时转子磁轭受强大离心力作用而产生径向变形愈来愈显著。原来的冷打键工艺已无法保证运行时的紧量,易造成磁轭与轮臂支架的分离,从而使机组产生过大的摆度和振动,甚至还会使轮臂支架挂钩因受冲击而断裂,造成严重事故。为避免磁轭与轮臂过速时的分离,近年来多采用热打键的方法。
With the emergence of high-capacity and high-speed hydrogenerators, the radial deformation of the rotor yoke is more and more pronounced due to its strong centrifugal force. The original cold-key process has been unable to ensure that the operation of the tight, easy to cause the yoke and the wheel arm bracket separation, so that the unit too much swing and vibration, and even make the wheel bracket due to the impact of the hook Fracture, causing serious accidents. In order to avoid the yoke and the arm over the speed of the separation, in recent years, the use of hot key method.