Balance weight type variable contact force piezoelectric motor

Abstract

The invention discloses a balance weight type variable contact force piezoelectric motor. The piezoelectric motor comprises a piezoelectric body and a moving part, wherein the piezoelectric body is contact with the moving part through elastic restoring force produced by an elastic prepressing element; the elastic extension direction of the elastic prepressing element is perpendicular to the actuating direction of the piezoelectric motor; in addition, the piezoelectric body is hinged to a transverse base; a connecting line between the piezoelectric body and the transverse base is parallel to the actuating direction of the piezoelectric motor. The piezoelectric motor has high thrust and large stroke, can bilaterally move, has a long service life, and simultaneously has a self-locking function during power off.

Description

technical field [0001] The invention relates to a piezoelectric motor and belongs to the technical field of piezoelectric precision actuation. Background technique [0002] The inverse piezoelectric effect of piezoelectric ceramics can convert electrical energy into mechanical energy. The actuator designed according to this effect has the characteristics of simple structure, good electromagnetic compatibility and fast response. [0003] Since the deformation output of piezoelectric ceramics is affected by the excitation electric field and its own stiffness, for the convenience of use and the practicability of electric excitation, it is usually a sheet structure similar to a parallel plate capacitor, and its output deformation is very small. In order to convert this tiny deformation into the macroscopic motion of moving objects, there are two commonly used technologies: one is to stack multiple pieces of piezoelectric ceramics and make integrated components in parallel with c...

AI Technical Summary

Problems solved by technology

[0005] First, the two clamping units that realize alternate clamping are independent of each other and the distance between them is relatively long, which requires that the parallelism of the guiding mechanism should be high enough. Higher parallelism is difficult and requires higher production costs;

[0006] Second, the distance between the existing guide mechanisms is fixed, and the wear at both ends of the clamping unit will eventually lead to the inability to achieve clamping, resulting in failure;

[0007] Third, when all the laminated piezoelectric ceramics are powered off, the locking force between the clamping unit and the parallel guide rail is much smaller than that of the clamping unit locking the parallel guide rail, so the inchworm clamping step Piezoelectric motors have almost no power-off self-locking ability

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