Vibration characteristic analysis of a piezoelectric transducer using first bending vibration modes

A piezoelectric transducer using first bending vibration modes is proposed in this paper; it can be used as a stator for an ultrasonic motor. The transducer has a symmetrical structure, in which a conical horn is located at one end. On the tip of the horn, a cylindrical driving foot is machined. Bending vibrations are superimposed in the transducer to generate elliptical trajectory movement at the driving foot. The working principle of the proposed transducer is analyzed. The resonant frequencies and the electromechanical coupling factor of the bending modes are analyzed under different structural parameters. An improved structure for the initial model is proposed. The motion trajectory of the driving foot is obtained by transient analysis. The results can be a theoretical guidance for the design of piezoelectric actuator using bending transducer.