Position control of active magnetic levitation using YBCO bulk and multiple electromagnets

Y. Ito, H. Ueda, K. Agatsuma, Atsushi Ishiyama

    Research output: Contribution to journalArticle

    Abstract

    We have been developing an active magnetic levitation system composed of field-cooled disk-shaped YBCO bulk and multiple ring-shaped electromagnets which are vertically piled up. We have demonstrated and reported that the levitation height, as well as stability, can be remarkably improved by adjusting the operating current of each electromagnet individually. In this study, we constructed a noncontact position control system in the vertical direction based on the feedback control theory and the electromagnetic field analyses considering superconducting characteristics of the YBCO bulk. Depending on levitation height, the operating current in the electromagnets is controlled automatically. The system consists of two ring-shaped copper-winding electromagnets without iron core and a ring-shaped YBCO bulk magnetized by the field-cooling process. We carried out experiments to verify the feasibility of noncontact position control system. In the experiment for position control, the levitation height maintained a target position accurately, and responded smoothly to changing target position. In addition, we aimed at the construction of the position control system with higher accuracy using the numerical simulation based on the finite element method analyses. And, the position control system that piled up three electromagnets was designed and constructed. Concretely, accuracies of the position control within 28νm were obtained. Final goal of our study is to apply the levitation system to the inertial nuclear fusion in which the accuracy as high as several νm would be required.

    Original languageEnglish
    Article number241
    Pages (from-to)987-990
    Number of pages4
    JournalJournal of Physics: Conference Series
    Volume43
    Issue number1
    DOIs
    Publication statusPublished - 2006 Jun 1

    Fingerprint

    electromagnets
    levitation
    rings
    control theory
    feedback control
    nuclear fusion
    finite element method
    electromagnetic fields
    adjusting
    cooling
    iron
    copper

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Position control of active magnetic levitation using YBCO bulk and multiple electromagnets. / Ito, Y.; Ueda, H.; Agatsuma, K.; Ishiyama, Atsushi.

    In: Journal of Physics: Conference Series, Vol. 43, No. 1, 241, 01.06.2006, p. 987-990.

    Research output: Contribution to journalArticle

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