Motor repair
Now I will summarize the problems that are often encountered in motor maintenance and introduce several practical methods in the repair work.
1 After the end cap is installed, the motor insulation resistance is reduced.
The winding is well insulated from the casing before the cage motor is repaired without the two ends. After mounting, the insulation resistance is reduced. This phenomenon can be judged that the fault occurs at both ends of the winding. The reason for the decrease in insulation resistance may be that the paint film on the enamel wire has a partial break or the winding mode is too large to extend the end of the winding. After the end cap is covered, the inner wall of the end cap approaches or contacts the fault point, so that the winding insulation resistance is lowered.
To eliminate this type of fault, first determine which end of the motor the fault is on.
The method of judging is: first install an end cap, and measure the insulation resistance of the winding with a 500V insulation resistance meter. If it is very low, it indicates that there is a fault in the end winding. Then, remove the end cap and attach the other end cap to measure the insulation resistance of the winding. If it is also low, the other end is also faulty. The rotor may not be installed during the process of disassembling and installing the end cap.
After determining the faulty end, generally shape the end of the winding slightly and apply some insulating paint. If the problem is not solved, a layer of film green paper can be easily placed on the outside of the end of the winding. Generally can be eliminated.
