Trial Construction and Operation of an Ultrasonic Vibration Driven Motor

Theoretical and Experimental Investigation of Its Performances

Abstract

As is well known, very little research work has heretofore been conducted for developing a high power electric motor driven by an ultrasonic vibration driving system. This paper describes a principle according to which ultrasonic vibration can be converted to rotary movement in one direction, and proves theoretically that our new and unique motor can be operated at a high efficiency.
As a result of repeated experiments it was observed that a prototype apparatus in accordance with our energy conversion mechanism generates a uni-directional rotary movement which traces an elliptical track, as expected from our theory. As a typical example, when 28 kHz ultrasonic vibration was converted into uni-directional rotary movement by means of vibratory pieces made of carbon steel which have dimensions of 0.5mm thickness and 5mm width, it was found that 5 W driving power was generated per piece at 80% conversion efficiency.