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Causes of vibration of three-phase asynchronous motor
Apr 25,2025
If the three-phase asynchronous motor is to be used in mechanical equipment for a long time, it must be placed stably to make it run smoothly. Then for the phenomenon of motor vibration, we must find out the reason, otherwise it is more likely to cause motor failure and damage the motor.
This article focuses on the method of finding the cause of vibration of a three-phase asynchronous motor 1. Before the three-phase asynchronous motor is stopped, use a vibration meter to check the vibration of each part, and test the vibration value of the part with large vibration in the vertical, horizontal and axial directions. If the bolts are loose or the bearing end cover screws are loose, they can be tightened directly. After tightening, measure the vibration and observe whether the vibration is eliminated or reduced.
2. Secondly, check whether the three-phase voltage of the power supply is balanced and whether the three-phase fuse is blown. Single-phase operation of the motor will not only cause vibration, but also cause the temperature of the motor to rise rapidly. Observe whether the pointer of the ammeter swings back and forth, and whether the current swings when the rotor is broken.
3. Finally, check whether the three-phase current of the three-phase asynchronous motor is balanced. If a problem is found, contact the operator to stop the motor in time to avoid burning the motor.
If the motor vibration is still not resolved after the surface phenomenon is treated, continue to disconnect the power supply and unlock the coupling to mechanically separate the load connected to the motor, and the motor only rotates.
If the motor itself does not vibrate, it means that the vibration source is caused by the misalignment of the coupling or load machinery; if the motor vibrates, it means that there is a problem with the motor itself.
In addition, the power-off method can be used to distinguish between electrical and mechanical reasons. When the power is cut off, the three-phase asynchronous motor does not vibrate or the vibration decreases immediately, indicating that it is an electrical failure, otherwise it is a mechanical failure.
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