Following completion of the Yamanashi Maglev Test Line, running experiments commenced in the spring of 1997. By utilizing a superconducting magnet loaded on the vehicle, the eddy current flows by being exposed to the fluctuating field from the ground coils. In addition, the field of the superconducting coil influences the eddy curent and the magnetic force generates vibration. A countermeasure agaist the compounding between this electromagnetic action and the mechanical vibration action is a remarkable and difficult point in the superconducting magnet design. Mechanical vibration in the cryogenic temperature portion generates heat by fretting between the internal structures and by friction. Further, since the eddy current generates heat by joule loss, heat generation at these cryogenic portions leads to the evaporation of liquid helium; the key is whether this amount of heat generation can be compensated by the reliquefying capability of the refrigerator loaded on the vehicle. Hitachi Ltd. has achieved, firstly, the suppression of both vibration and the eddy current by structural optimization through numerical analysis, and secondly in accommodating the amount of helium evaporation within the specified value. By developing a peculiar insulating method, which allows exellent mass productivity aiming chiefly at the security of durability and reliability, the ground coil has attained the specific performance.


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    Title :

    Superconducting magnet and ground coils for the Yamanashi Maglev Test Line


    Additional title:

    Supraleitende Magnetspulen und Bodenspulen für die japanische Yamanashi- Magnetbahn-Versuchsstrecke


    Contributors:

    Published in:

    Hitachi Review ; 46 , 2 ; 95-100


    Publication date :

    1997


    Size :

    6 Seiten, 7 Bilder, 3 Tabellen, 9 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





    Development of Ground Coils for Yamanashi Maglev Test Line

    Sawada, Kazuo / Tsuruga, Hitoshi / Iida, Takeo | IuD Bahn | 1996


    Development of Ground Coils for Yamanashi Maglev Test Line

    Sawada, K. / Tsuruga, H. / Iida, T. | British Library Online Contents | 1996


    Yamanashi Maglev Test Line and Electromagnetic Characteristics of Superconducting Maglev

    Fujiwara, S. | British Library Conference Proceedings | 1998


    Vehicles for superconducting Maglev system on Yamanashi test line

    Takao, M. / Wessex Institute of Technology | British Library Conference Proceedings | 1994