A novel traveling wave ultrasonic motor using a bar shaped transducer

Abstract

A novel traveling wave ultrasonic motor was proposed. The structure of the motor is rather simple and different from the conventional traveling wave ultrasonic motors. Its production processes are very convenient. It is composed of a stator constituted with a ring and a bar shaped transducer and two cone shaped rotors. The rotors were pressed on inner surface of the ring by means of a pre-pressure system. The bar shaped transducer has a sandwich-like configuration, where two sets of piezoelectric element are bolted. One set excites a longitudinal vibration of the bar, and the other set excites a flexural vibration of the bar. The ring’s traveling wave excited with the longitudinal vibration and the bending vibration of the bar transducer was simulated with FEM (finite element method). The prototype of the motor was made and investigated experimentally for its performance. Its maximum torque and rotating speed are 0.25 N · m and 50 r/min, respectively.

Keywords

ultrasonic motor / traveling wave / bar transducer

References

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