A linear piezo-electric ultrasonic motor using a single flexural vibrating bar for electro-discharge system industrial applications

This paper provides the development process of a linear piezo-electric ultrasonic motor using a single flexural vibrating bar. The process covers the design methodology, conceptual design, basic configuration, modelling and analysis, principle of operation, motor structure, experimental examination and evaluation of the main characteristics of the motor. The motor comprises three main parts: the stator, rotor and sliding element. The mechanism concept of the developed motor is based on creating elliptical motions of surface points generated by superposition of longitudinal and bending vibration modes of oscillating structures. Pressing the stator against the driving tip, the microscopic motions are transferred into a rotary motion then into linear motion through the friction between parts of the motor. The developed motor provides a linear motion and can be driven with common droving system with electrical signal of invariable frequency. Modelling using finite element analysis, mechanism and design of the component of the developed prototype are presented in this paper. The essential experimental test to implement the motor in electro-discharge system industrial application was carried out, and the initial results show that the developed prototype is able to provide a reversible directional of motion, no-load travelling speed equal to 28 mm/s, maximum load of 0.78 N, a resolution < 50 mu m and a dynamic response < 10 ms.