Piezoelectric step motor

Details Piezoelectric step motor Piezoelectric step motor

1998-02-04

2001-06-05

Enad, Elvin (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S323020

Reexamination Certificate

active

06242849

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 stepping motor comprising a power supply unit, a rotor, a stator, driving bimorph piezoelectric cells and fixing elements (SU, A, 769665).
However, in this piezoelectric stepping motor the bimorph piezoelectric cell has insignificant contact with the rotor resulting in nonuniform steps of the angular displacement of the rotor.
Also known in the art is a piezoelectric motor which stator comprises a piezoelectric hollow cylinder having inside a cylindrical rotor frictionally interacting with the stator (SU, A, 573828).
However, this piezoelectric motor operater through the shifting and radial oscillations of the rotor and stator and their frictional interaction, in which case it is impossible to provide uniform angular displacement of the rotor and its accurate positioning.
SUMMARY OF THE INVENTION
The basic object of the present invention is to create a piezoelectric stepping motor which construction would allow to simplify the design and manufacturing technology, to provide a uniform rotation of the rotor and its accurate positioning, as well as reversing.
This object is achieved by providing a piezoelectric stepping motor comprising a housing, a stator in the form of a cylindrical hollow piezoelectric cylinder inside a cylindrical rotor frictionally interacting with the stator, in which motor, according to the invention, the stator comprises at least two rotary-fixing and fixing piezoelectric units, which are disposed inside the housing one behind the other in a longitudinal plane, the rotary-fixing piezoelectric unit comprising a rotary and fixing piezoelectric cells, insulators and a friction element, and the fixing piezoelectric unit comprising a fixing piezoelectric cell, insulators and a friction element, or the stator comprises at least two pairs of piezoelectric units disposed at least in one transversal plane and shaped in the from of sectors.
The housing may be movable, and piezoelectric units may be fixed on the motionless rotor.
The piezoelectric cells may be made in the form of a packet 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.
The rotor or movable housing may have at least one guide which enters the corresponding guide on the friction elements.
Such constructive embodiment of the claimed stepping motor makes it possible to simplify the design and manufacturing technology of the motor, to increase the uniform rotation of the rotor and its accurate positioning, as well as its reverse.


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

Affiliated with

Also associated with

Rating

Piezoelectric step motor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Piezoelectric step motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Piezoelectric step motor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2486806