Railway Technical Research Institute

Hiroki Kamijo

Eiji Suzuki

Kaoru Nemoto

Akihiko Kishikawa

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.

Growing community of inventors

Tokyo, Japan

Hiroki Kamijo