Motor phase loss refers to the failure or disconnection of one or more phases in the three-phase power supply of the motor. This fault phenomenon will cause the motor to malfunction or even damage the motor. The following are some typical fault phenomena and treatment methods of motor phase loss:

Fault phenomenon of motor phase loss:

Increased vibration: The vibration becomes larger and there is abnormal noise when the motor is running.

Temperature increase: Due to overheating problems caused by current imbalance, the motor temperature will increase dramatically.

Speed drop: When phase loss occurs, the motor speed will drop immediately.

Current increase: The current in the unaffected phase will increase sharply, far exceeding the rated current level.

Difficult starting: There is a strong buzzing sound when starting and it cannot start.

How to deal with motor phase loss:

Check the power circuit: Check the fuses, switches, cables, etc. in the power circuit. If any fault is found, repair or replace it in time.

Check the motor wiring: Connect the motor strictly according to the motor manual and check whether the wiring is correct to avoid motor phase loss due to wiring errors.

Motor winding inspection: Use a multimeter to check the three-phase winding resistance of the motor. If the resistance value of one phase is infinite or has a large difference with the other two phases, it may indicate that there is a phase loss problem in that phase.

Three-phase current balance method: Determine the phase loss by measuring the three-phase current of the motor. If the current difference is large, it indicates that the motor may have a phase loss fault.

Observation method and auscultation method: Determine the phase loss by observing the conditions and sounds of the motor during operation. If the motor makes abnormal sounds during operation, has obvious vibrations and abnormal noises, and is accompanied by heat, there may be a phase loss fault.

Replace damaged components: If the internal components of the motor, such as windings, terminal blocks, etc., are damaged, they need to be replaced in time to ensure the normal operation of the motor.

Regular maintenance: Regular inspection and maintenance of the motor, such as cleaning the motor surface and lubricating the motor bearings, can extend the motor's service life and avoid motor failures such as phase loss. The above methods can effectively diagnose and handle motor failures and ensure safe and stable operation of the motor.