Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1998-02-04
2000-11-28
Enad, Elvin
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
31032302, H01L 4108
Patent
active
061539910
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
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 cylindrical piezoelectric hollow cylinder having inside a cylindrical rotor frictionally interacting with the stator (SU, A, 573828).
However, this motor cannot perform 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 a 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 its design and manufacturing technology, to increase the motor power output and the accuracy in 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 piezoelectric units arranged in the housing one behind the other in a longitudinal plane, the first piezoelectric unit comprising a rotary, a shifting and a fixing piezoelectric cells, insulators and a friction element, the second piezoelectric unit comprising a fixing piezoelectric cell, insulators and a friction element which interacts with the movable part, or the fixing devices comprising at least two piezoelectric units which are disposed at least in one transverse plane and made in the form of sectors.
The housing may be made movable and the piezoelectric units may be secured on a stationary cylindrical rod.
The piezoelectric cells are preferably 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.
Such a constructive embodiment of the claimed stepping motor makes it possible to simplify the design and manufacturing technology, to increase the forces developed by the motor and 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 accompanying drawings, in which
FIG. 1 is a front view of the claimed piezoelectric 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. 5 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 shown in FIG. 7;
FIGS. 9-14 show the working time steps of the piezoelectric stepping motor during linear displacement of the movable part, a longitudinal section;
FIG. 15 shows the first working time step of the motor during rotation of the movable part, cross sections of the two piezoelectric units;
FIGS. 16-20 show other time steps of the piezoelectric stepping motor during rotation of the movable part.
THE BEST EMBODIMENTS OF THE INVENTION
The piezoelectric stepping motor according to the first embodiment of the invention comprises a cylindrical housing 1 (FIG. 1), fixing devices in the form of two piezoelectric units 2 (FIG. 2) and 3, and a movable part 4 made in the form of a cylindrical rod.
The piezoelectric u
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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
Enad Elvin
Medley Peter
Samsung Electronics Co,. Ltd.
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