Causes of vibration and noise of three-phase asynchronous motor

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When the motor is in normal operation, there is also a sound, which is caused by two aspects: the iron core silicon steel sheet vibrates due to the electromagnetic force after the alternating magnetic flux, and the blasting action of the rotor. But these sounds should be uniform. If abnormal noise or vibration occurs, there is a problem. Below, the causes of vibration and noise are listed one by one.

1. Electromagnetic reasons

1 Wiring error, such as the reverse connection of one phase winding, the windings of each parallel circuit have different numbers of turns.

2 winding short circuit.

Each of the 3 multi-way windings is open.

4 rotor broken bars.

5 iron core silicon steel sheet is slack.

6 power supply voltage is asymmetrical.

7 magnetic circuit is asymmetrical.

2. Mechanical reasons

1 The foundation is not fixed firmly.

2 The motor and the mechanical axis of the belt are not in a straight line (the center is not found correctly or the back wheel washer is loose, etc.).

3 The rotor is eccentric or the stator wedge protrudes to rub the stator and rotor (broom).

4 bearing oil shortage, rolling bearing steel ball damage, bearing and bearing sleeve friction, bearing seat displacement.

5 Fan blade damage or balance damage on the rotor.

The vibration of the motor caused by the abnormal vibration of the 6 belt.

Metal End Fittings

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