Electric power conversion systems – Current conversion – With conductive support mounting
Patent
1996-08-19
1998-04-07
Berhane, Adolf
Electric power conversion systems
Current conversion
With conductive support mounting
336118, H02M 100, H01F 2106
Patent
active
057372110
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a linear-motion contactless power supply system for transferring electrical power (including information based on electrical signals) in a linear direction without direct contact through the use of high-frequency electromagnetic induction.
TECHNICAL BACKGROUND
The device shown in FIG. 1 has been known as an example of linear-motion contactless power supply systems of the prior art. In this device, primary conductor (primary coil) 21 is strung as an aerial line, an iron core 23 to which secondary conductor (secondary coil) 22 is attached surrounds primary conductor 21 and is slidably disposed with respect to primary conductor 21. In this case, primary conductor 21 is supported at both end portions 24 in its longitudinal direction in order that iron core 23 is permitted to slide (cf. Japanese Patent Publication No. 23723/1983).
However, if the device has a construction which is elongated in the direction of movement, the primary conductor produces a catenary line due to its own weight, and this leads to the possibility that the primary conductor will make contact with the movable core made of magnetic material on which the secondary conductor is wound in the vicinity of the center of the overall length of the primary conductor as a result of a long-term use or stress caused by mechanical vibration. As a result, support of the primary coil over the overall length of linear range by a non-magnetic rigid body has been considered, but such a structure tends to cause leakage of magnetic flux, and moreover, does not allow for a device of compact structure, and therefore has not proved to be practical. On the other hand, Japanese Patent Laid-open Hei 5-207603 discloses a device in which contactless power supply for a moving body moving on a road surface is constructed through the use of a litz wire bundle. However, such a device cannot be applied for apparatuses which are not intended to be installed on a road.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide linear-motion contactless power supply device allowing a more compact construction and in which leakage of magnetic flux is prevented.
Another object of the present invention is to provide a linear-motion contactless power supply device wherein the primary conductor (coil) is supported along its overall length by a non-magnetic body, and in which losses of power supply can be prevented without reducing the degree of electromagnetic coupling between the primary and secondary conductors (coils).
A first linear-motion contactless power supply device according to the present invention is provided with a stationary unit and movable unit that can move along the longitudinal direction of this stationary unit, and supplies power from the stationary unit to the movable unit without direct contact, said power supply device being characterized in that the stationary unit is a cylindrical primary conductor to which is supplied a high-frequency alternating current, and that the movable unit is provided with a secondary conductor and a high-frequency toroidal core, wherein the secondary conductor is isolated from the primary conductor and is arranged coaxially with the primary conductor so as to be slidable in the longitudinal direction of the primary conductor, and the high-frequency toroidal core is arranged so as to cover the secondary conductor from the outside.
A second linear-motion contactless power supply device according to the present invention is provided with a stationary unit and a movable unit that can move along the longitudinal direction of the stationary unit, and allows supply of electrical power from the stationary unit to the movable unit without direct contact, wherein the stationary unit includes a primary-side core, which is a rod-shaped high-frequency magnetic substance, and a primary-side coil made of litz wire bundles each of which is a multiplicity of insulated wires bundled and connected at both ends and to which a high-frequency alternating current is sup
REFERENCES:
patent: 5301096 (1994-04-01), Klontz et al.
patent: 5341280 (1994-08-01), Divan et al.
patent: 5608615 (1997-03-01), Luce
Hiraga Yoshiji
Hirai Junji
Berhane Adolf
Kabushiki Kaisha Yaskawa Denki
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