Method and device for reducing vibration noise of motor

The invention provides a method and a device for reducing vibration noise of a motor. The method for reducing the vibration noise of the motor includes a, acquiring measured values of the frequency and the amplitude of the vibration noise of the motor and storing the measured values; b, computing theoretical values of the frequency and the amplitude of the vibration noise of the motor according to calibration parameters of the motor; c, comparing the measured values acquired in the step a to the theoretical values computed in the step b, and computing pre-compensation quantities for the frequency and the amplitude of the vibration noise of the motor; d, generating a novel control parameter according to the pre-compensation quantities; f, generating PWM (pulse width modulation) signals according to the novel control parameter; g, controlling the motor according to the PWM signals. The method and the device have the advantages that the measured values of the vibration noise of the motor are compared to the theoretical values of the vibration noise of the motor, pre-compensation can be carried out on the motor, motor control strategies can be adjusted, accordingly, the vibration noise of the motor can be reduced, the method is simple and reliable, the cost is low, and the service life of the motor can be prolonged.