A dual ring rotary traveling wave ultrasonic motor

In this paper, a dual ring ultrasonic motor based on out of plane bending vibration mode is proposed, fabricated and characterized. This motor is composed of a stator constituted with two ring and one rod-shaped transducer at the middle and two disk shaped rotors. There are four piezoelectric ceramic plates are bolted at the middle of the rod-shaped transducer and used to excite the stator's blending vibration mode. The ring is used to amplify the vibration amplitude of the rod-shaped transducer. The rotor pressed on the conical surface of the stator can be driven to rotate by the friction force induced by the traveling wave vibration of the stator. It can be seen from experimental results that proposed motor can rotate at the maximum value of 65 rpm and the maximum output torque is 0.07N·m, while applied with the driving voltage of 250 Vp-p. This motor can be designed double output shaft has a great potential for applications of the actuator control.