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EP0404147A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Controlled levitation/suspension in a magnet-superconductor system

Assignee: International Business Machines Corp
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Filing: 1990-06-21
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Granted: —
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Expires: 2010-06-21
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Abstract

Abstract A device for providing controlled levitation or suspension including a current-carrying conductor (10) for affecting interactions for example by producing a magnetic field intercepting the superconductor, thereby affecting the flux penetration and/or flux pinning properties of the superconductor (S). By varying the magnitude of the control current the magnitude of the field produced by the coil varies which in turn varies the magnetic interactions in the magnet-coil-­superconductor system. This provides a controllable and stable range of levitation, suspension distances, and rotation in the system. Any type II superconductor can be used, but particular advantages are obtained when high T c superconductors are used. This apparatus has utility and applications such as storage where the enhanced levitation or suspension effects can be used to create a bearing, or for the precise placement of one element with respect to another, as for instance a slider carrying a recording head over a storage medium.

Inventors

  • 👤 John James Boland
  • 👤 Derek Brian Dove
  • 👤 Takeshi Takamori

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 04:21
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0408; F16C32/0436; F16C32/0438; H; H03; H03K; H03K17/00; H03K17/51; H03K17/92

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 82 words
A device including: a type II superconductor (S), a magnet (M), a conductor (10) through which an electrical current can flow to produce a magnetic field intercepting at least a substantial portion of said superconductor to alter the flux penetration properties of said superconductor, said magnet being capable of suspension or levitation or rotation with respect to said superconductor, the levitation or suspension distance or rotational displacement being adjustable over a range depending on the magnitude of electrical current through said conductor.
Claim 2
Independent Claim 82 words
A device including: a type II superconductor (S), a magnet (M), a conductor (10) through which an electrical current can flow to produce a magnetic field intercepting at least a substantial portion of said superconductor to alter the flux penetration properties of said superconductor, said magnet being capable of suspension or levitation or rotation with respect to said superconductor, the levitation or suspension distance or rotational displacement being adjustable over a range depending on the magnitude of electrical current through said conductor.
Claim 3
Dependent Claim 19 words
The device of claim 1, where said superconductor is a high T c superconductor, preferably containing copper-oxygen current-carrying planes.
Claim 4
Dependent Claim 14 words
The device of claim 1, where said superconductor is a metal or metal alloy.
Claim 5
Independent Claim 18 words
The device of any one of the preceding claims, where said conductor is a coil surrounding said superconductor.
Claim 6
Dependent Claim 42 words
The device of claim 4, where the axis of said coil being at an angle between 0° and 90° with respect to the plane of said superconductor, preferably the axis of said coil being substantially per­pendicular to the plane of said superconductor.
Claim 7
Independent Claim 26 words
The device of any one of the preceding claims 1 to 3, where said conductor and said magnet are located on opposite sides of said superconductor.
Claim 8
Independent Claim 24 words
The device of any one of the preceding claims 1 to 3, where said conductor is substantially coplanar with the plane of said superconductor.
Claim 9
Independent Claim 33 words
The device of any one of the preceding claims 1 to 3, where said magnet and said conductor are located on the same side of said superconductor, said magnet superconductor and said conductor.
Claim 10
Independent Claim 45 words
The device of any one of the preceding claims, where the magnetic field H produced by electrical current in said conductor is in the range H c1 <H<H c2 where H c1 and H c2 are the lower and upper critical fields of said superconductor.
Claim 11
Independent Claim 18 words
The device of any one of the preceding claims, further including cooling means (14) for cooling said superconductor.
Claim 12
Dependent Claim 30 words
Magnetic storage system comprising a magnetic head which is positioned with respect to a magnetic storage medium by means of a device according to any one of the preceding claims.
Claim 13
Dependent Claim 22 words
Switching means wherein the switching function is accomplished by a device according to any one of the preceding claims 1 to 10.

References Cited (Backward Citations)

US4879537A Cited
DE3830680A1 Cited

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