1, the motor coil is burnt out. Remove the burnt-out coil and replace it with a new one. Dip insulating paint in the motor maintenance to enhance insulation.

2. When dismantling the burnt winding, measure the wire diameter, count the number of turns and span of each turn, remember the connection mode, and clean up the sundries in the slot. Coils with the same parameters are rolled off one by one according to the specified requirements, and the process shaping is carried out to make the exposed coil heads at both ends of the stator equal.

3. Insert the attached body into the wire pressing plate, connect the head and tail of each coil to the main wiring in turn, and connect the terminals in phases. Then, place the motor vertically along the axis, put it in a drying room or other safe heat source, and preheat it to about 100℃ to facilitate the penetration of insulating paint.

4. Both ends are dipped in paint and dried (85 ~110℃) for 4 hours. Finally, install the rotor and end cover, and test run for 0.5h. When grounding, short circuit and other faults occur after the paint dipping operation, the fault can be eliminated by replacing the whole coil.

5. Before repainting unpainted paint, when faults such as current imbalance and power drop are detected, local coil replacement is adopted to eliminate the faults. At this point, the motor maintenance coil is completed.