Piezoelectric adjustable-speed motor and driving control method thereof

The invention discloses a piezoelectric adjustable-speed motor and a driving control method thereof, and relates to the field of piezoelectric material application. The piezoelectric adjustable-speedmotor comprises a stator, a rotor, a pre-pressure mechanism, a power supply slip ring and an output shaft; the piezoelectric ceramic pieces are used for exciting a row of traveling waves respectively,the two rows of traveling waves make contact with the friction contact surfaces of the stator and the rotor, and the stator drives the rotor to operate through friction force. The driving control method comprises the steps of adjusting the voltage and the frequency of excitation signals on the stator and the rotor and the phase difference of the two phases of signals to obtain the driving effectthat the rotating speed is less than 1 rpm and realize the speed adjustment function. The piezoelectric motor is enabled to have the characteristics of ultralow-speed operation and load capacity. Withapplication of the method o