Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Including superconductivity
Patent
1998-10-22
2000-07-25
Jackson, Stephen W.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Including superconductivity
361 19, 361115, H01H 9700
Patent
active
060943335
ABSTRACT:
A control method allowing stable operation of a refrigerator conduction cooling type superconducting coil employing an oxide high temperature superconductor is provided. Thermal resistance between a refrigerator and a superconducting coil connected to a cooling stage of the refrigerator is obtained. From the obtained thermal resistance and the rated cooling capacity of the refrigerator, an effective cooling curve representing the relation between the temperature and calorific value is obtained. Operation of the superconducting coil which is energized while being cooled by the refrigerator is controlled such that the calorific value of the superconducting coil at a prescribed temperature does not exceed the effective cooling curve.
REFERENCES:
patent: 3643002 (1972-02-01), Minnich
patent: 5447033 (1995-09-01), Nagao et al.
Katsutoki; "Superconductive Magnet Apparatus"; Publication No. 60 245285; Publication Date: Dec. 12, 1985; vol. 010, No. 108; (Apr. 23, 1986.
Kazuaki; "Conduction Cooling Superconduction Magnet Device"; Publication No. 07 086642 Publication Date: Mar. 31, 1995; vol. 095, No. 006; (Jul. 31, 1995).
Proceedings of the 8th International Workshop on Critical Currents in Superconductors, Edited by Teruo Matsushita et al., pp. 471-474, May 27-29/1996.
Jackson Stephen W.
Sumitomo Electric Industries Ltd.
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