Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1993-10-28
1995-07-11
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
335216, 104281, B60L 1300, H01F 600
Patent
active
054326699
ABSTRACT:
A superconducting magnet apparatus according to the present invention has serially connected superconducting magnets, which are energized and de-energized via disconnectors from a power supply installed on a vehicle of the train, mounted in a pair on both sides of a magnetically levitated train that oppose guiding ground coils of a magnetically levitated railway when the magnetically levitated train is traveling, each superconducting magnet has a plurality of serially connected superconducting coils, persistent current switches are parallel-connected across respective ones of the superconducting coils, and demagnetizers are provided for linking and changing over corresponding persistent current switches mounted in pairs on both sides of the magnetically levitated train. The superconducting magnet apparatus is provided with an interconnecting normal conductive line which, when the power supply is cut off from the disconnectors, is connected between current lead wires, which are nearest to the power supply, on a load side of the disconnectors, for serially interconnecting all of the superconducting coils so that a circulating current can be passed through them, and protective resistors having resistance values of such size that when a superconducting coil undergoes a normal conductive transition and current in the superconducting coil opposing this superconducting coil is commutated from the persistent current switch, this opposing superconducting coil is caused to undergo a normal conductive transition.
REFERENCES:
patent: 3845720 (1974-11-01), Bohn et al.
patent: 4273054 (1981-06-01), Yamashita et al.
patent: 4356772 (1982-11-01), van der Heide
patent: 5249529 (1993-10-01), Herbermann
IEEE Transactions on Magnetics. vol. 27, No. 2, Mar. 1991, pp. 2272-2275.
Kamijo Hiroki
Kishikawa Akihiko
Nemoto Kaoru
Suzuki Eiji
Gaffin Jeffrey A.
Railway Technical Research Institute
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