A Ring Type Standing Wave Ultrasonic Motor Using Cantilever Type Bending Transducer

To obtain large mechanical output power, a ring type standing wave ultrasonic motor using cantilever type bending transducer is proposed. There is a cantilever on one side of the ring, and four PZT ceramics are set on each end surface of the cantilever. The bending mode of ring is excited by the bending vibration of cantilever transducer. Thus, linear simple harmonic motions are achieved at the particles on the teeth. The working principle of proposed motor is analyzed. The ring and transducer are designed with FEM. The bending vibration modals of transducer and ring are degenerated, and the motion trajectories of nodes on the teeth are analyzed. The analysis results indicate that a standing wave is excited in the ring by the bending vibration of transducer, and the proposed motor has potential good output characteristics. The results of this paper verify the theoretical feasibility and provide instructions for the development of proposed motor.