Compound Linear Ultrasonic Motor Based on Shaking Beam

Abstract

The transformation of high-frequency vibrations of piezoelectric elements into continuous linear motion of a slider is one of the main tasks of a linear piezoelectric motor. To produce a high thrust force in the piezoelectric linear actuator, we proposed the compound piezoelectric linear actuator based on a ''shaking beam'' excited by two sources of longitudinal mechanical vibrations shifted by =2. The compound actuator consists of two shaking beams and is rigidly fastened. The finite element method (FEM) was used to define structural and electrical boundary conditions for the compound piezoelectric actuator. FEM analysis showed that the compound actuator's trajectory was elliptical. Experimental research has shown that the compound piezoelectric actuator has high thrust force.

Analysis of Tiny Piezoelectric Ultrasonic Linear Motor

“…In order to achieve the high performance motor, the motor must be considered not only during stable operation but also during development of dynamic properties. [12][13][14] Therefore, we suggest that the shaft material has a direct influence on efficiency, reliability, and quality of the motors and their dynamic properties. The selection of the shaft material is crucial to achieve high performance of the motors.…”

A study on the friction and thrust force of the shaft and mobile element in the impact typed piezoelectric ultrasonic linear motor

“…In general, the ultrasonic motor's features are mentioned such as a high torque at a comparatively low speed of rotation, small volume with no gears, low energy consumption without application of a separate braking mechanism and no electromagnetic noise without coil system. In a recent study, a tiny ultrasonic linear actuator which changes the direction of the vibrations induced by piezoelectric ceramics was introduced [3][4][5]. The driving force of ultrasonic motors comes from piezoelectrically excited ultrasonic vibration and frictional force, which differs significantly from electromagnetic motors that utilize the Lorentz force.…”