1, the phenomenon of failure: the motor can not start, and there is no sound.
Causes: 1 Blown fuse. 2 The starter goes off. 3 The power is not available.
2, the phenomenon of failure: the motor can not start, there is a loud noise.
Reasons: 1 The power cord is disconnected on one phase, or one phase of the fuse is blown, or one phase winding of the motor is disconnected. 2 The air gap between stator and rotor is not normal, so that the stator and the rotor collide. 3 bearing damage. 4 was mechanically stuck.
3, fault phenomenon: the fuse is blown when the motor starts.
Reasons: 1 The stator coils are connected in reverse. 2 Stator coil short circuit or ground. 3 bearing damage. 4 Drive belt is too tight. 5 was mechanically stuck. 6 Misoperation when starting.
4, the phenomenon of failure: the motor speed is low after starting.
Reasons: 1 The power supply voltage is too low. 2 Connect the delta-connected motors into a star. 3 Stator coil short circuit. 4 The rotor's short-circuit ring, cage bar breaks or opens. 5 motor overload.
5, failure phenomenon: motor temperature is too high, but the current does not exceed the rated value.
Causes: 1 The ambient temperature is too high. 2 motor air duct blocked. 3 motor sludge, dust too much affect the heat.
6, the phenomenon of failure: the explosion of the motor in operation.
Cause: 1 coil is temporarily grounded. 2 coils are temporarily short-circuited.