The Identification Method of Vibration Motor Noise

Date: 2022-01-07     From: Longding     Author: admin

This article mainly introduces the identification method of vibration motor noise. It will have a great effect on reducing motor noise and ensuring equipment safety.

The identification method of vibration motor noise

1. Power-off method

Utilizing the characteristics that electromagnetic noise changes with the strength of the magnetic field, the size of the load current, and the level of conversion, the power supply is suddenly cut off after a period of quiet listening to the motor running at no load, and the part of the noise will disappear immediately as the power supply is cut off. This is electromagnetic noise. After a power failure, the noise generated by the motor continuing to run by inertia is mechanical noise. Repeat several times in order to be confirmed.

2. Change voltage method

When the power supply voltage drops rapidly to a certain limit (the speed does not change significantly), if the electromagnetic noise is the main part of the motor noise, it will vary greatly with the voltage, while other noises are basically unchanged.

3. Electric current test method

If the stator winding is asymmetrical or internal phase failure or short-circuits between turns, the three-phase current is unbalanced. If the rotor cage is broken or the three-phase rotor of the wound motor is asymmetrical, the stator current will fluctuate to identify electromagnetic noise.

4. Drag method

Using a low-noise motor to drive the motor under test to rotate, and lift and lower the carbon brush several times to identify the effect of carbon brush noise.

5. Disassembly method

For aerodynamic noise with stable characteristics, it can be distinguished by the change of noise before and after removing the fan (small motor) or the external blower (large and medium motor). In addition, by replacing fans with different outer diameters and types, distinguishing the difference in noise at different speeds, the fan noise can also be identified.