Piezoelectric step motor

Details Piezoelectric step motor Piezoelectric step motor

1998-02-04

2001-04-03

Enad, Elvin (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S323020

Reexamination Certificate

active

06211605

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to the field of electric motors and, more specifically, it relates to piezoelectric stepping motors.
BACKGROUND OF THE INVENTION
Known in the art is a piezoelectric motor which stator comprises a piezoelectric hollow cylinder accommodating a cylindrical rotor, frictionally interacting with the stator (SU, A, 573828).
However, this motor cannot effect a linear displacement of the cylindrical rotor.
Also known in the art is a piezoelectric linear stepping motor comprising a housing having fixing units secured in it and a movable part with a working member (SU, A, 720576).
However, this piezoelectric motor has a complicated design, performs only a linear displacement of the movable part and cannot provide rotation of the movable part.
SUMMARY OF THE INVENTION
The basic object of the present invention is to create a piezoelectric stepping motor which constructive embodiment would make it possible to simplify the design and manufacturing technology, to increase motor forces and the accuracy of positioning the movable part during its rotation, linear displacement and combined motion (simultaneous rotation and linear displacement).
This object is achieved by providing a piezoelectric 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 rotary-shifting-fixing piezoelectric units arranged inside the housing in a longitudinal plane one behind the other, each piezoelectric unit comprising a rotary piezoelectric cell, a fixing piezoelectric cell and a friction element separated by insulators, or the fixing units comprise at least two pairs of rotary-shifting-fixing piezoelectric units which are arranged at least in one transverse plane and shaped in the form of sectors.
The housing may be movable, and the piezoelectric units may be secured on the stationary rotor.
The piezoelectric cells may be made in the form of a set of piezoelectric rings or their sectors which electrodes are connected in parallel alternately, in which case the direction of polarization of each successive piezoelectric 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.
Such constructive embodiment of the claimed stepping motor makes it possible to increase the forces developed by the motor and the accuracy in positioning the movable part.


REFERENCES:
patent: 5043621 (1991-08-01), Culp
patent: 5068566 (1991-11-01), Culp
patent: 5136201 (1992-08-01), Culp
patent: 5144187 (1992-09-01), Culp
patent: 5182484 (1993-01-01), Culp
patent: 5241235 (1993-08-01), Culp
patent: 5273238 (1993-12-01), Sato
patent: 0112454 (1983-10-01), None
patent: 0360975 (1990-04-01), None
patent: 60-002081 (1985-08-01), None
patent: 60-082072 (1985-10-01), None
patent: 573828 (1977-10-01), None
patent: 738016 (1980-05-01), None

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