A Finite Volume Method and Experimental Study of a Stator of a Piezoelectric Traveling Wave Rotary Ultrasonic Motor
Piezoelectric traveling wave rotary ultrasonic motors are motors that generate torque by using the friction force between a piezoelectric composite ring (or disc-shaped stator) and a metallic ring (or disc-shaped rotor) when a traveling wave is excited in the stator. The motor speed is proportional to the amplitude of the traveling wave and, in order to obtain large amplitudes, the stator is excited at frequencies close to its resonant frequency. This paper presents a method to determine the resonance frequency of the stator by modeling the stator with the finite volume method. Simulation results are presented together with experimental results for the stator of a USR60 piezoelectric motor.