Controllable levitation device

Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type

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310 12, 310 905, 505879, 34081562, 40426, 40449, H01F 722

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active

052988759

ABSTRACT:
Apparatus for levitating a magnetic body. The apparatus includes a structure (10) comprised of a material that is superconductive below a critical temperature. The structure includes at least one Josephson junction device (14) for passing a variable current therethrough for controlling an amount of magnetic flux penetration into the structure. At a first current flow magnetic flux generated by a magnetic body (12) is excluded from the structure and the magnetic body is levitated above a surface of the structure. At a second current flow the magnetic flux penetrates the structure, causing he levitating magnetic body to approach a surface of the structure. Controllably applying a current to an array (30) of superconductive tiles (34), forming Josephson tunnel junctions (38), is shown to provide a lateral motion of, or a rotation of, the magnetic body relative to the surface.

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"Levitation Effects Involving High T.sub.c Thallium Based Superconductors" W. Harter, Appl. Phys. Lett. 53(12) Sep. 19, 1988.
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"Observation of Enhanced Properties in Samples of Silver Oxide Doped YBa.sub.2 Cu.sub.3 O.sub.x " by N. Peters et al. Appl. Phys. Lett. 52(24), Jun. 13, 1988.
"Levitation of a Magnet Over a Flat Type II Superconductor" F. Hellman et al. J. Appl. Phys. 63(2), Jan. 15, 1988.
"Magnetic Hysteresis of High-Temperature YBa.sub.2 Cu.sub.3 O.sub.x -AgO Superconductors: Explanation of Magnetic Suspension" by C. Huang, Mod. Physics Letters B vol. 2, No. 7, Aug. 1988.
"Levitation Effects Involving High T.sub.c Thallium Based Superconductors" W. Harter, Appl. Phys. Lett. 53(12) Sep. 19, 1988.
"Friction in Levitated Superconductors", E. Brandt, Appl. Phys. Lett 53(16) Oct. 17, 1988.
"Magnetic Suspension of Superconductors at 4.2K", R. Adler et al., Appl Phys. Lett vol. 53, No. 5, Dec. 1988.
"Flux Penetration in High T.sub.c Superconductors: Implications for Magnetic Suspension and Shielding", D. Marshall et al., Appl. Phys. A48, 87-91, 1989.

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