Rotary piezoelectric motor

Abstract

The invention discloses a rotary piezoelectric motor, and belongs to the technical field of precision driving and positioning. The rotary piezoelectric motor comprises double stators, an active cell,a pre-tensioning mechanism, a bearing seat, a stator seat and a base. The main body of the double stators is composed of a metal cross beam and a piezoelectric ceramic, an inner stator generates rotational vibration, an outer stator generates axial vibration, and the double stators are bonded together. The superposition of the vibration of the double stators generates the elliptical motion of a torus mass point of the inner stator, and an active cell shaft is driven to perform one-way rotational motion by friction. The rotary piezoelectric motor has the advantages that the working frequency islower, the working frequency is about 1000 hertz, and the requirement for a matched circuit is lower; the positioning accuracy is high, and the step angle can reach up to 0.01 degree; the structure is simple, the assembly is convenient, and the load capacity is large due to the contact of the whole torus.

Description

technical field [0001] The invention belongs to the technical field of precision driving and positioning, and specifically relates to a rotary piezoelectric motor. Background technique [0002] In recent years, piezoelectric motors have been widely used in precision drive and positioning, biotechnology, medical equipment, aerospace technology and other fields due to their small size, high power density, fast response, and no electromagnetic interference. Piezoelectric motors can be divided into ultrasonic motors and quasi-static motors according to the principle. Ultrasonic motors include traveling wave motors and standing wave motors. Traveling wave motors use multiple vibrators to form traveling waves on the surface of the stator, making the surface particles form elliptical motions, thereby Drive the mover to move; the standing wave motor uses mode merger or directly uses a single mode to make the particle on the driving foot form an elliptical motion or oblique motion to...

AI Technical Summary

Problems solved by technology

[0003] Since the ultrasonic motor works in the ultrasonic frequency band, it needs to be equipped with a dedicated high-frequency power supply. In most cases, the high-frequency power supply is much larger than the ultrasonic motor body, and the cost is higher, which limits the working range of the ultrasonic motor.

Quasi-static motors are widely used in the field of precision driving and positioning due to their ultra-high displacement accuracy, but they work in a non-resonant state, with low work efficiency and slow running speed

Images