Piezoelectric actuator and linear piezoelectric motor

Abstract

The invention discloses a piezoelectric actuator and a liner piezoelectric motor. The piezoelectric actuator comprises at least two piezoelectric chip which are overlapped, wherein each piezoelectric chip has a preset polarization distribution direction, and the surface of each piezoelectric chip is provided with a first driving electrode assembly and a second driving electrode assembly which are matched with the polarization distribution direction of the piezoelectric chip; under the action of driving voltage with a preset characteristic frequency applying to the first driving electrode assemblies and the second driving electrode assemblies, both piezoelectric chip can generate vibration deformation with the same frequency, thus, based on the composite vibration deformation of the two piezoelectric chips, the piezoelectric actuator can integrally generate standing wave harmonic oscillation or traveling wave motion in a first order flexural vibration mode. The piezoelectric actuator provided by the invention has simple structure, is practical and convenient, and can effectively reduce the driving voltage of the piezoelectric actuator and improve the driving force.

Description

technical field [0001] The invention relates to piezoelectric motor technology, in particular to a piezoelectric driver and a linear piezoelectric motor. Background technique [0002] Piezoelectric motor is a kind of miniature motor, which has the advantages of fast response speed and high displacement resolution, and can be applied to micro-nano positioning and driving in micro or ultra-miniature machinery, such as focusing or zooming drive of micro or ultra-miniature digital camera lens etc. Since the piezoelectric motor has a compact structure and a small size, how to improve the convenience of manufacturing the piezoelectric motor, the control performance of the piezoelectric motor, and the driving capability of the piezoelectric motor is very important. [0003] The piezoelectric motor mainly includes a piezoelectric driver and moving parts. The piezoelectric driver is a key component that provides driving force. The piezoelectric motor relies on the specific movement o...

AI Technical Summary

Problems solved by technology

[0004] However, the existing piezoelectric single crystal driver made of a single piezoelectric single crystal has a simple structure, but when it needs to achieve the required vibration, the required driving voltage is relatively large, and the driving force is relatively small when driven by low voltage.

Images