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Generation&Characteristics of Noise(Washer Motor)

Update:14-02-2020
Summary:

The Washer Motor is the power for the washing machine a […]

The Washer Motor is the power for the washing machine as well as the noise source of the washing machine. The noise comes from vibration, and the magnitude of the vibration determines the volume. The vibration of the Washing Machine Motor is transmitted to the rotating system and the box part of the washing machine through the transmission belt and the base, which generates the noise of the washing machine. Noise is also a sign of failure. Therefore, judging the noise source has an important role in troubleshooting.

The generation and characteristics of noise are as follows:

(1) Electromagnetic noise

This is when the Washing Machine Motor is in operation, the air gap magnetic density interacts with the stator and rotor teeth harmonics, the pulsating magnetic pull of the stator and rotor magnetic poles, and the one-way impact tension generated by the uneven air gap cause the stator to generate periodic vibration and emit noise. The magnitude of electromagnetic noise depends on the symmetry of the motor's circuit, magnetic circuit, and the air gap magnetic field formed by it. It is obviously affected by the voltage and disappears when the power is off. The electromagnetic noise of a normal motor is a stable and uniform "hum".

(2) Mechanical noise

This is the sound of the rotating part and the stationary part before the motor is in operation due to vibration and friction. The noise source is the periodic vibration caused by the asymmetric mass of the bearing and the rotor. The sound is uniform and continuous, intermittent or periodic noise at low speed, and continuous high frequency noise at high speed.

(3) Air friction noise

This is the noise produced by the fan and blades on the rotor that impact and rub against the air when the motor is running. As the rotor speed increases, the sound is continuous and single. For the washing machine motor, the rotor only has small cast aluminum blades, and the impact and friction on the air is very small, so the air friction noise is negligible compared with electromagnetic and mechanical noise.