Single-phase motor common fault diagnosis method

Power supply voltage is normal, power on the motor does not start

1) Power supply wiring open circuit (motor completely silent). Measure the terminals should be no voltage.

2) The main winding is open (the motor is completely silent).

2) The main winding or auxiliary winding is disconnected. Measurement of DC resistance can be used to determine whether the circuit is broken.

3) The centrifugal switch contacts are not closed, so that the auxiliary winding can not be energized to work. Disconnect the connection point of the main winding and auxiliary winding, and then use the method of measuring DC resistance can be determined, or you can use the second part of the method to determine.

4) start capacitor wiring open circuit or internal disconnection. Find the method with the above item 3).

5) For shaded-pole motors, the shaded-pole coil (shorting ring) is open or disconnected. For short-circuit ring set up external can be seen, often through observation can be found, otherwise available in the second part of the method to determine.

6) For series-excited motor, not on the brush or because the brush is too short, stuck, etc. can not be contacted with the commutator, or the brush lead is disconnected, or the armature winding, magnetic field winding internal open circuit.