The cause of the malfunction (1) power supply voltage is too high, the core greatly increase the heat; (2) power supply voltage is too low, the motor with a rated load operation, the current Ambassador of the winding fever; the ③ repair removal of winding, improper heat demolition method, burns core;④ stator and rotor core rubs; the ⑤ motor overload or frequent starting; ⑥ cage rotor broken bars; (7) motor phase loss, two-phase operation; the ⑧ weight around the stator winding dipping inadequate; the ⑨ environmental temperature high motor surface dirtor air ducts clogged; the ⑩ motor fan failure, poorly ventilated; stator windings of stator winding faults (phase-to-phase, turn-to-turn short circuit; internal connection error).

    Troubleshooting (1) reduce the supply voltage (such as adjusting the power supply transformer tap) if the motor Y the delta connection error, you should correct the connection; (2) to improve the supply voltage or change the crude supply conductors; core (3) maintenance, troubleshooting; (4) eliminate the rub point (adjust the air gap or setback, car rotor); (5) load shedding; prescribed frequency control starter; the ⑥ check and eliminate the rotor winding fault; (7) to restore the three-phase operation; ⑧ secondary dipping and vacuum impregnation process; ⑨ cleaning the motor, to improve the ambient temperature, the cooling measures; the ⑩ inspection and repair fan and replace if necessary; overhaul stator windings, eliminate the fault.