Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type
Patent
1997-06-19
2000-08-29
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Superconductive type
335299, H01F 100
Patent
active
061114901
ABSTRACT:
A cold head is disposed in an insulating container and cooled by a refrigerator. A superconductor is disposed in the insulating container, contacting the cold head, and is cooled to its superconduction transition temperature or lower by heat conduction. A magnetizing coil is disposed outside the insulating container for applying a magnetic field to the superconductor. Control is performed so that a magnetic field determined considering the magnetic field to be captured by the superconductor is applied. A pulsed magnetic field is applied to the superconductor a plurality of times. Each pulsed magnetic field is applied when the temperature of the superconductor is a predetermined temperature or lower. A maximum pulsed magnetic field is applied at least once in an initial or intermediate stage of the repeated application of pulsed magnetic fields. After that, a pulsed magnetic field equal to or less than the maximum pulsed magnetic field is applied. Pulsed magnetic fields are repeatedly applied while the temperature of the superconductor is lowered. A pulsed magnetic field is applied when the temperature T.sub.0 of a central portion of the superconductor is the superconduction transition temperature or lower and the temperature of a peripheral portion is higher than T.sub.0. The temperature of the entire superconductor is brought close to T.sub.0 to apply another pulsed magnetic field. The magnetizing coil faces at least one of two opposite sides of the superconductor to apply pulsed magnetic fields to the superconductor in its magnetization direction.
REFERENCES:
patent: 5633588 (1997-05-01), Hommei et al.
patent: 5659278 (1997-08-01), Yanagi et al.
patent: 5686876 (1997-11-01), Yamamoto et al.
Advances in Superconductivity X, Osamura et al., vol. 1, ISTEC, Oct. 1997.
Itoh Yoshitaka
Oka Tetsuo
Yanagi Yousuke
Yoshikawa Masaaki
Aisin Seiki Kabushiki Kaisha
Donovan Lincoln
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