Design of an ultrasonic motor which has Nib shaped stator

In this study, simple ultrasonic motor of plate type stator was proposed. Stator of the proposed ultrasonic motor was composed of an elastic plate and ceramics. The elastic plate has one tip in the middle. The two ceramics were attached on the side surfaces of the elastic plate. The both polarization directions were directed to the upward outside directions. When two AC voltages which have basically 90 degree phase difference were applied to the two ceramics, elliptical displacements of the stator tips were obtained. FEA simulation(ATILA) was used to analyze elliptical displacement characteristics of the friction line tips depending on the width and thickness of elastic body and ceramic. Optimize the elliptical displacement by synchronizing the two resonant frequencies. Based on the FEA results, one model of motor which showed effective characteristics at contact line was chosen and fabricated. The output characteristics of the prototype motor based on the analysis data were measured. And characteristics of the motor were compared with the simulated results.