Electrical generator or motor structure – Dynamoelectric – Reciprocating
Patent
1996-05-10
1998-04-14
LaBalle, Clayton E.
Electrical generator or motor structure
Dynamoelectric
Reciprocating
H01L 4106
Patent
active
057396019
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to electrotechnology and means of automation and can be used as a device for adjustable displacements of objects, primarily for precise positioning of the actuators of machines and mechanisms.
PRIOR ART
Magneto-mechanical converters with an electromagnetic system, containing an excitation coil, serving as a magnetic field source, and a magnetostrictive core, made of a rare-earth metal-iron alloy, are known (Research of highly magnetostrictive materials on the basis of rare-earth metals (REM), report of the Physical Faculty of MGU (Moscow State University), Subject 46/75, 1977, Moscow, p. 3). The magnitude of displacements of the mobile part of the referred to magneto-mechanical converter is relatively small. Besides, the use of the magnetic field source in the form of an electric excitation coil requires significant energy consumption, in order to maintain the specified parameters of the magnetic field in the process of operation, which complicates the use of the converter as a positioner or vibrator.
A magneto-mechanical converter with a magnet system, including a magnetic field source in the form of an electric excitation coil, and a core at least one part of which is made of a magnetostrictive material, and that is connected with an actuator movable relative to the housing, is also known (SU, Author Certificate No. 765913).
Main drawbacks of the known magneto-mechanical converters include high energy consumption of the magnetic field source, which typically is implemented in the form of an electric excitation coil, due to the fact that in order to maintain the necessary parameters of the magnetic field while setting and keeping unchanged the specified linear dimensions of the core it is required to continuously supply current through the excitation coil of the magnetic field source. And what is more, for the referred to known technical solution, an additional heating of the magnet system and material of the core usually occurs, which results in the necessity of creating a complicated system of cooling and compensation of temperature changes of the linear dimensions of the core. The aforementioned drawbacks are the cause of increase of the device volume and mass on the whole, and as a result the known magneto-mechanical converters do not provide sufficient accuracy in systems for precise positioning. In addition, high energy consumption complicates the use of the converter as a vibrator.
SUMMARY OF THE INVENTION
It is an object of this invention to design a magneto-mechanical converter, that would allow decrease of power consumption and the magneto-mechanical converter volume and mass with a simultaneous increase of the range and discreteness of changes of the linear dimensions of the core, as well as provide possibilities for the converter to work as a vibrator.
It is achieved by the fact that, in the magneto-mechanical converter, comprising a main magnetic field source, and a core with at least one part made of a magnetostrictive material, connected with the actuator, which is movable relative to the housing, according to the invention, the main magnetic field source is a permanent magnet, the core and the magnet system are mounted in the housing with the capability of relative rotation, where the axis of relative rotation of the core and the magnet system is oriented in such a way that linear dimensions of the core change in the process of the above-mentioned relative rotation due to the alteration of the magnetic flux in the core.
It is desirable to place the core in the designed position in such a way that the geometrical center of at least one of its parts, made of a magnetostrictive material, is in one of the zones of the magnet system which corresponds the maximum of intensity of the magnetic field of this system.
It is further desirable to orient the axis of relative rotation of the core and the magnet system nonparallel with the vector of intensity of the magnet system magnetic field in the geometrical center of at least one part of th
REFERENCES:
patent: Re28381 (1975-04-01), Edson
patent: 4766357 (1988-08-01), Glomb, Jr.
patent: 5184037 (1993-02-01), Kobayashi et al.
Ingerman Jeffrey H.
LaBalle Clayton E.
Magneto Corporation
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