Design optimization of double ring rotary type ultrasonic motor

Abstract

This paper describes the design, optimization and experimental results of piezoelectric motor that uses the radial mode of excitation of the double rings stator. The main goal of the proposed design is to increase motor performance using d33 ceramic polarization working in the radial mode. The proposed motor can be driven by a simple harmonic signal and used for standard piezoceramic rings. The stator consists of four parts: metal ring, Alumina (Al2O3) ring and double piezoceramic rings. The design is optimized for laser cutting machine and is cost effective for manufacturing. The main application field of the proposed motor is micro-air vehicles (μAV). The finite element method (FEM) was used to define the structural and electrical boundary condition for the symmetrical coplanar trimorph piezoelectric actuator. The results of the numerical calculations after geometry optimization, some experimental results and mechanical properties of the ultrasonic motor are presented in this paper as well.