Causes and solutions for overheating or even smoke from the motor

1. cause of issue

1 The power supply voltage is too high, so that the iron core heat is greatly increased;

2 The power supply voltage is too low, the motor is operated with the rated load, and the current is too large to make the winding heat;

3 When repairing and removing the winding, use the thermal disassembly method improperly to burn the iron core;

4 fixed rotor core rubbing;

5 motor overload or frequent start;

6 cage rotor broken bars;

7 The motor is out of phase and the two phases are running;

8 rewinding is not sufficient for the winding dipping paint;

9 high ambient temperature, the motor surface has a lot of dirt, or the air duct is blocked;

10 motor fan failure, poor ventilation; stator winding failure (phase-to-phase, inter-turn short circuit; internal connection of stator windings is wrong).

2. Troubleshooting

1 Reduce the power supply voltage (such as adjusting the power supply transformer tap), if the motor Y, Δ connection error caused, you should correct the connection method;

2 increase the power supply voltage or change the thick power supply wire;

3 overhaul the iron core to eliminate the fault;

4 eliminate the rubbing point (adjust the air gap or setback, car rotor);

5 load shedding; control start according to the specified number of times;

6 check and eliminate rotor winding faults;

7 resume three-phase operation;

8 using secondary dipping paint and vacuum dipping process;

9 cleaning the motor to improve the ambient temperature, using cooling measures;

10 Check and repair the fan, replace if necessary; repair the stator winding to eliminate the fault.

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