Biogas generator sets can be marine 50Hz or 60Hz alternators, mostly three-phase synchronous generators. According to the generator set, it can be divided into gas generator, steam turbine generator and diesel generator. Steam turbine generator or gas turbine generator is used in some large ships and some ships. General ships use medium speed diesel generators. Other ships use low-speed shaft generators, mostly of medium capacity.

1．一般维护

1. General maintenance

为保证发电机正常工作，在它附近不应有水，油及污物堆积，不能有腐蚀性气体，以免损伤发电机绕组绝缘。

In order to ensure the normal operation of the generator, there shall be no accumulation of water, oil and dirt near it, and no corrosive gas, so as not to damage the insulation of the generator winding.

在防潮防尘的同时，要注意不能影响发电机的正常通风冷却。要经常清洁通风孔道内的灰尘污物，保持畅通无阻。冷却空气的温度不得过低，以免绕组及其它导电器件上凝结水珠。

While preventing moisture and dust, pay attention not to affect the normal ventilation and cooling of the generator. Always clean the dust and dirt in the ventilation duct and keep it unobstructed. The temperature of cooling air shall not be too low to avoid condensation on windings and other conductive devices.

对因故短期停止运行的发电机，集电环可不必包扎保护，但要在电刷与集电环之间垫以绝缘纸板、石腊纸或沥青纸，以免电刷在集电环表面—上形成斑点。

For the generator that stops running for a short time for some reason, the collector ring does not need to be wrapped for protection, but insulating cardboard, paraffin paper or asphalt paper shall be padded between the brush and the collector ring to prevent the brush from forming spots on the surface of the collector ring.

发电机的加工面，如果由于油，漆脱落而锈蚀时，应及时除锈，并涂以防锈漆。

If the machined surface of the generator is rusted due to oil and paint falling off, it shall be derusted in time and coated with antirust paint.

2．拆装注意事项

2. Precautions for disassembly

发电机拆装方法与异步电动机大致相同，但由于发电机重量大，拆装时应注意不要碰伤。拆卸端盖时，注意不要碰伤凸出在机座处面的定子线圈；取出转子时，要在电机定、转子间垫以纸板，以防损伤铁芯和绕组在用钢索绑扎转子时，钢索不得碰到转子轴颈、凤扇、集电滑及转手引线。绑钢索处必 须垫以木板或橡皮。

The disassembly and assembly method of the generator is roughly the same as that of the asynchronous motor, but due to the large weight of the generator, care should be taken not to bump during disassembly and assembly. When removing the end cover, be careful not to damage the stator coil protruding from the base; When taking out the rotor, cardboard shall be padded between the stator and rotor of the motor to prevent damage to the iron core and winding. When binding the rotor with steel cable, the steel cable shall not touch the rotor journal, Phoenix fan, collector slip and rotating lead. The place where the steel cable is tied must be padded with wood or rubber.

3.发电机轴承的维护与保养

3. Maintenance of generator bearing

在油环润滑的滑动轴承中，轴承的油量应一定，一般不在运行时注油。油量在规定液面下，轴承不应甩油，以免溅到绕组上。

In the sliding bearing lubricated by oil ring, the oil quantity of the bearing shall be certain, and it is generally not injected during operation. When the oil volume is below the specified liquid level, the bearing shall not throw oil to avoid splashing on the winding.

采用滚珠或滚柱轴承的电机，当运行约2000h时，即需更换润滑脂一次。轴承用于灰尘多而又潮湿环境中时，应根据情况经常更换润滑油。

For motors with ball or roller bearings, the grease needs to be replaced once when running for about 2000h. When the bearing is used in dusty and humid environment, the lubricating oil shall be changed frequently according to the situation.

在启动长期停用的发电机前：如装有滚动轴承时，必 须先检查其润滑状态，若原有润滑脂已脏或已经硬化变质，必 须先将轴承冲洗干净，再用汽油清洗。后填人清洁的润滑脂。填入量为轴承室空间的2／3，不可填入过多。

Before starting the generator that has been out of service for a long time: if the rolling bearing is installed, its lubrication state must be checked first. If the original lubricating grease is dirty or hardened and deteriorated, the bearing must be washed first and then cleaned with gasoline. Then fill with clean grease. The filling amount is 2 / 3 of the bearing chamber space, and it is not allowed to fill too much.