Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-02-04
2000-11-21
Ramirez, Nestor
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
31032302, H01L 4108
Patent
active
061507504
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to the field of electric motors and, more particularly, the invention relates to piezoelectric stepping motors.
BACKGROUND OF THE INVENTION
Known in the art is a linear stepping motor comprising a guide, a housing and a mover in the form of plates secured in the housing at an angle to the inner surface and frictionally interacting with the guide (SU, A, 801145).
However, this stepping motor has large overall dimensions and mass and performs the movement with the help of elastic plates, in which case it is impossible to obtain high forces and provide an accurate positioning.
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 great number of components, a complicated design and is complicative in 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 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 of the motor and to increase the accuracy in positioning the movable part.
This object is achieved by providing a piezoelectric linear stepping motor comprising a housing having fixing units and a movable part, in which motor, according to the invention, the fixing units comprise at least two piezoelectric units, each piezoelectric unit comprising a shifting piezoelectric cell and a fixing piezoelectric cell separated from each another, from the housing and from the friction element by insulators, the piezoelectric units are arranged inside the housing one behind the other in a longitudinal plane or in one transverse plane and have a form of sectors.
The housing may have a form of a parallelepiped, the piezoelectric units may be made in the form of parallelepipeds and 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, and the piezoelectric units may be arranged in one transverse plane.
The housing may have cut-out, through which the movable part goes outside the housing.
The movable part may have at least one guide which enters a respective guide on the friction elements.
It is desirable for the motor to have at least two pairs of piezoelectric units disposed in the transverse 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 may be fixed on a stationary rod.
Such constructive embodiment of the piezoelectric linear stepping motor being patented makes it possible to simplify the construction and manufacturing technology, to obtain high forces at a small size and mass and to increase the accuracy in positioning the movable part.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is further described by way of example with reference to the appended drawings, in which:
FIG.1 is a front view of the claimed piezoelectric linear stepping motor (the first embodiment);
FIG.2 is a longitudinal section of the motor shown in FIG.1;
FIG.3 is a front view of the second embodiment of the motor;
FIG.4 is a longitudinal section of the motor shown in FIG.3;
FIG.5 is a front view of the third embodiment of the motor;
FIG.6 is a longitudinal section of the motor shown in FIG.5;
FIG.7 is a front view of the fourth embodiment of the motor;
FIG.8 is a longitudinal section of the motor
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
Burov Sergey Vyacheslavovich
Okatov Jury Vladimirovich
Medley Peter
Ramirez Nestor
Samsung Electronics Co,. Ltd.
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