A PIEZOMOTOR USING LONGITUDINAL ACTUATORS

A new travelling wave type ultrasonic motor has been developed which u ses longitudinal piezoelectric actuators to generate a progressive wav e on the surface of a metallic ring. The rotor, which moves through fr ictional force, is pressed on this elastic plate. This paper deals wit h the motor construction and its characteristics. Theoretical modellin g and experimental performances obtained with the motor prototypes are reported. A maximum of 0.8 Nm and a no-load rotation speed of 120 rpm have been obtained with a double rotor prototype. The results indicat e that this piezomotor is proved to operate successfully at a mechanic al output power of 4 W.