What are the common faults of variable frequency motors?

Update:31 Aug 2020
Summary:

Common faults in the use of variable frequency motors. […]

Common faults in the use of variable frequency motors.

With the development of the motor industry, the application of variable-frequency speed-regulating motors has gradually become popular, especially in the fan industry, water pump industry and other production machinery industries. The use of variable-frequency speed-regulating motors has become a sign of the upgrading of these mechanical equipment.

Common faults of variable frequency motors

The voltage imbalance of the variable frequency speed control motor, in short, is that the three phase amplitudes of the phase-to-phase voltage of the three-phase system are different. The voltage imbalance at the terminals of the variable frequency motor will adversely affect the operation of the motor and cause problems on the input side of the variable frequency motor drive. Voltage imbalance will cause a voltage gap and excessive current flowing into one or more phases. Voltage imbalance will also cause the current overload fault protection on the variable frequency speed motor drive to trip.

The current imbalance of variable frequency speed regulation is caused by the difference between the phase current levels of the three-phase system. Excessive current imbalance will indicate or cause problems with the drive rectifier of the variable frequency speed control motor, which will cause the motor to overheat, fail to start after stopping, reduce efficiency, or even burn the variable frequency speed control motor. Voltage imbalance can also cause current imbalance.

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