1, room temperature is too high
2, poor heat dissipation
3, overload
4, overvoltage undervoltage or voltage imbalance
5, frequent start and stop or frequent positive and negative
6, lack of phase
7, the fan is bad or the air inlet and outlet are blocked
8, bearing oil shortage
9, mechanical stuck blocked
10, the load moment of inertia is too large, the startup time is too long
11, short circuit between turns
12. The internal wiring of the new motor is incorrect.
13, the star triangle wiring is wrong
14, star triangle or self-even buck start load restart time is long or the fault is not normally converted
15, the motor is damp
16, squirrel cage asynchronous motor rotor broken strip
17. Wire-wound asynchronous motor rotor winding breakage or resistance imbalance
18, rotor broom
19, the power supply harmonics are too large, such as large rectifier equipment nearby, high-frequency equipment, etc.
20, the motor core flux reduction for multiple maintenance
21, some motor winding process is poor
22. High motor temperatures are generally unlikely to be bearing problems unless the bearing temperature is too high.
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