PIEZOELECTRIC MOTOR, ROBOT HAND, ROBOT, FINGER ASSIST DEVICE, ELECTRONIC COMPONENT CONVEYING DEVICE, ELECTRONIC COMPONENT INSPECTION DEVICE, LIQUID PUMP, PRINTER, ELECTRONIC CLOCK, AND PROJECTOR

摘要

PROBLEM TO BE SOLVED: To provide a piezoelectric motor which does not need a switch or a driving circuit and is able to perform delicate control.SOLUTION: A first driving signal is supplied to a first electrode of a vibration body, a second driving signal is supplied to a second electrode of the vibration body, and a common driving signal is supplied to a common electrode of the vibration body. A phase of the first driving signal is changeable to the common driving signal, a phase of the second driving signal is changeable to the common driving signal. Thus, by making either phase of the first driving signal or second driving signal be changed to the common driving signal, the driving direction of the piezoelectric motor can be switched. Furthermore, when only the phase is to be changed, the switch is not needed so that the driving circuit can be made small, and the piezoelectric motor is controllable at the moment of switching the driving direction so that delicate control can be performed with the piezoelectric motor.