Piezoelectric linear step motor and variants

Details Piezoelectric linear step motor and variants Piezoelectric linear step motor and variants

1998-02-04

2001-05-29

Enad, Elvin (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S323020

Reexamination Certificate

active

06239533

ABSTRACT:

TECHNICAL FIELD
The present invention relates to the field of electric motor manufacture and, more particularly, the invention relates to piezoelectric stepping motors.
BACKGROUND OF THE INVENTION
Known in the art is a linear motor comprising a guide, a housing and a mover in the form of plates secured at an angle in the housing and frictionally interacting with a guide element (SU, A, 801149).
However, this linear stepping motor has large overall dimensions and mass and performs the movement with the help of elastic plates thereby it is impossible to obtain high forces and to provide positioning accuracy.
Also known in the art is a piezoelectric linear stepping motor comprising a housing having of fixing units secured in it and a movable part with a working member (SU, A, 720576).
However, this piezoelectric motor has a great number of components, a complicated manufacturing fixing units, and its movable part is liable to an accidental turn in the process of linear displacement.
SUMMARY OF THE INVENTION
The basic object of the present the invention is to create a linear piezoelectric stepping motor which constructive embodiment would make it possible to simplify the design and manufacturing technology, to obtain high forces at small dimensions and mass and to increase the positioning accuracy.
This object is achieved by providing a piezoelectric linear stepping motor comprising a housing having fixing units secured therein and a movable part; in which motor, according to the invention, the fixing units comprise at least two piezoelectric units disposed one behind the other in a longitudinal or a transverse plane; the first piezoelectric unit being made of a shifting and fixing piezoelectric cells, a split friction element separated by insulators, the second piezoelectric unit is made of a fixing piezoelectric cell, a split friction element and insulators, the movable part being arranged along the motor axis and in contact with the split movable elements.
The piezoelectric units located in the transversal plane may have a form of sectors.
The housing may have a form of a parallelepiped, the piezoelectric units can be made as parallelepipeds disposed one behind the other in the longitudinal plane, and the movable part may be made in the form of a rod having a rectangular cross section.
The housing may also have a form of a polyhedron.
It is desirable for the housing to have a cut-out, through which the movable part goes outside the housing.
It is reasonable for the movable part to have has at least one guide which enters a respective guide on the friction elements.
The motor may have at least two pairs of piezoelectric units disposed in the transversal plane.
The piezoelectric cells may be made in the form of a packet of piezoelectric plates, rings or their sectors which electrodes are connected in parallel alternately, in which case the direction of polarization of each successive piezoelectric plate, ring, or sector is opposite to that of the previous one.
The gaps between the piezoelectric units are preferably filled with an elastic insulating material.
The housing may be movable and the piezoelectric units can be fastened on a stationary bar.
Such design of the claimed motor makes it possible to simplify the construction and manufacturing technology, to obtain high forces at a small size and mass and to increase the positioning accuracy.


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