The electromagnetic noise radiation of the motor depends on the vibration response of the electromagnetic excitation force (Jing Xiangli), the vibration response of the motor structure and the surface acoustic radiation characteristics of the motor. Therefore, the method of reducing the noise of the motor can be attributed to:

(1) reducing the electromagnetic vibration force and increasing the number of its force wave.

(2) reducing the surface vibration of the motor.

(3) reducing the acoustic radiation efficiency.

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