1. Maintenance of electrical reasons: The first is to d […]
1. Maintenance of electrical reasons:
The first is to determine whether the three-phase DC resistance of the stator is balanced. If it is unbalanced, it means that the welding part of the stator is welded, the winding is separated by phase, and the winding is short-circuited. If the fault is obvious, it can be insulated. The surface is burnt, or the stator winding is measured with an instrument. After confirming the short circuit between turns, the motor winding is re-routed.
For example: pump motor, the motor is not only vibrating, but the temperature of the bearing is also high. The small repair test found that the DC resistance of the motor is unqualified, and the stator winding of the motor has a phenomenon of open welding. After the fault is found by the elimination method, the motor runs normally.
2. Maintenance of mechanical reasons:
Check that the air gap is uniform. If the measured value is exceeded, re-adjust the air gap. Check the bearing, measure the bearing clearance, if it is not qualified to replace the new bearing, check the core deformation and looseness, the loose iron core can be bonded with epoxy resin glue, check the rotating shaft, repair the reaming of the curved shaft or directly straight shaft Then do a balance test on the rotor. During the trial operation of the blower motor overhaul, the motor not only has a large vibration, but also the bearing temperature exceeds the standard. After several days of continuous processing, the fault remains unresolved. When the team members helped to find out, the air gap of the motor was very large, and the level of the tile seat was not qualified. After the fault was found, the motor was successfully tested once after re-adjusting the gaps.
3. The load mechanical part is checked normally, and the motor itself has no problem:
The cause of the fault is caused by the connection part. At this time, it is necessary to check the basic level of the motor, the inclination, the strength, whether the center is correct, whether the coupling is damaged, and whether the motor shaft extension is in compliance with the requirements.