一、前言护环装在发电机转子的两端,用来紧箍转子的端部绕组,防止其受力移动。当发电机工作时,护环承受巨大的离心力。为了保证护环与转子同心,防止振动,护环与转子搭接部份采用热装配合,因此配合处又受过盈装配应力作用。当发电机在高速运转及启动、停机的时刻护环尚受交变应力的作用。有些护环为了便于通风冷却,常常在护环上开一些通风孔,引起 I. Introduction Guard ring installed at both ends of the generator rotor, used to tighten the rotor end of the winding, to prevent its force to move. When the generator is working, retaining ring to withstand huge centrifugal force. In order to ensure that the grommet and the rotor are concentric and prevent vibration, the grommet and the rotor overlap part are assembled by hot assembly, so that the cooperation place is subjected to the interference stress of assembly. When the generator is running at high speed and start-up, downtime, the retaining ring is still subject to alternating stress. Some retaining ring in order to facilitate ventilation and cooling, often in the retaining ring to open some vents, causing