The noise is a combination of various frequencies and different intensity of the noise, and this annoying sound is well known to human harm. The noise tends to vibrate with vibration, and too much vibration can damage other equipments. The vibration noise level reflects the level of product design and manufacturing, and is an important index of product quality.. It is now generally recognized that the importance of reducing noise. As service staff should be clear how motor noise is generated, and what factors, at the same time to know how to reduce the noise and other methods.

    The main noise sources of the motor are electromagnetic noise, mechanical noise and ventilation noise..