Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-02-28
2000-11-28
Enad, Elvin
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
31032302, H01L 4108
Patent
active
061539651
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the field of electric motors and more specifically 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, propulsive 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 that results in nonuniform steps of the angular displacement of the rotor.
Also known in the art is a piezoelectric motor which stator comprises a cylindrical hollow cylinder having inside a cylindrical rotor frictionally interacting with the stator (SU, A, 573828).
However, this piezoelectric motor operates 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 constructive embodiment would allow to simplify the design and manufacturing technology, to obtain a high torque at small dimensions and mass of the motor while providing a uniform rotation of the rotor and its motion in the reverse direction.
This object is achieved by providing a piezoelectric stepping motor comprising a housing, a stator in the form of a cylindrical piezoelectric hollow cylinder having inside a cylindrical rotor frictionally interacting with the stator, in which motor, according to the invention, the stator comprises at least two rotary-fixing piezoelectric units, which are arranged inside the housing, one after another in the longitudinal plane each piezoelectric unit comprising a rotary and a fixing piezoelectric cells, insulators and a friction element.
The piezoelectric units may be made in the form of sectors.
The gaps between the piezoelectric units are preferably filled with an elastic insulating material.
The piezoelectric cells may be made in the form of a set of piezoelectric rings and 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 rotor may have at least one guide which enters the corresponding guide on the friction elements.
Such constructive embodiment of the stepping motor, according to the invention, would allow to simplify the design and the manufacturing technology, to obtain a high torque at small dimensions and mass of the motor while a providing uniform rotation of the rotor and its motion in the reverse direction.
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 piezoelectric stepping motor according to the invention;
FIG. 2 is a longitudinal section of the motor of FIG. 1;
FIG. 3 is a front view of another embodiment of the motor;
FIG. 4 is a longitudinal section of the motor shown in FIG. 3;
FIG. 5 is the first time step of the operation of the piezoelectric stepping motor, two cross-sectional views of the first and second rotary-fixing units;
FIGS. 6-10 are other time steps of the operation of the piezoelectric step motor.
THE BEST EMBODIMENTS OF THE INVENTION
The piezoelectric stepping motor, according to the invention, comprises a cylindrical housing 1 (FIG. 1), a stator 2 and a rotor 3 in the form of a cylindrical rod. The stator 2 (FIG. 2) is made in the form of two rotary-fixing piezoelectric units 4 and 5. Each piezoelectric unit 4 and 5 consists of a piezoelectric cell 6, a fixing piezoelectric cell 7, insulators 8 and a friction element 9 connected to each other. The rotary piezoelectric cells 6 have a polarization vector extending at an angle to the longitudinal plane of the motor. The fixing piezoelectric cells 7 have a radial polarization vector. The friction element
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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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