1. Overload; lack of phase; overvoltage, undervoltage or voltage imbalance; excessive moment of inertia of load; long starting time; frequent start and stop or frequent positive reversal.
2., the room temperature is too high; the fan is broken or the air inlet and outlet is blocked; the heat dissipation is not good.
3.the internal wiring of the new motor is wrong; turn-to-turn short circuit; the winding process of some motors is poor.
4.star triangle or self-even buck start-up load start-up time is long or does not switch normally due to failure; star triangle wiring is incorrect.
6.the high temperature of the motor is generally unlikely to be a bearing problem, unless the bearing temperature is too high. The machine is stuck and blocked; the bearing is short of oil.
7.the rotor bar of the squirrel cage induction motor is broken; the rotor winding of the winding asynchronous motor is broken or the resistance is unbalanced; the rotor sweeps the chamber; therefore, in the production and use of the motor, we must pay attention to these detailed problems, that is to say, in use, in accordance with the norms of operation, in addition, to ensure daily inspection and maintenance, which must be done in production.