Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type
Patent
1988-05-23
1989-02-28
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Superconductive type
335300, 1741251, H01F 722
Patent
active
048089540
ABSTRACT:
A superconducting coil apparatus comprises a first coil unit and second coil unit disposed concentrically outside the first coil unit. The second coil unit includes a cylindrical former having a spiral groove formed on an outer surface thereof, and a coil element constituted by a superconducting wire fitted in the spiral groove to form a spiral shape. The former is composed of a plurality of former segments which are assembled into a cylindrical foam. Each segment has a plurality of recess portions formed on the outer surfaces thereof and defining the spiral groove when the segments are assembled into the former. Each segment has a fluid passage formed on the outer surfaces thereof to permit the cooling medium to flow therethrough to come in contact with the superconducting wire. Thus, the coil apparatus is easy to assemble and relatively compact. Further, the spiral groove has V-shaped cross section, so that the superconducting wire will not be shifted in the axial direction of the coil element.
REFERENCES:
patent: 3514730 (1970-05-01), Kassner
patent: 3559126 (1971-01-01), Drautman
patent: 3801942 (1974-04-01), Elsel
patent: 4467303 (1984-08-01), Laskaris
IEEE Trans. MAG-15,843, "Conceptual Designs of 50kA 20MJ Superconducting Ohmic Heating Coils", Singh et al., Jan. (1979).
IEEE Trans. PAS-100, 7, 3398, "Application of Superconducting Technology to Power Transformers." H. Riemersma et al., Jul. 1981.
Harris George
Kabushiki Kaisha Toshiba
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