Trapped Field Characteristic of YBCO Bulk in AC External Magnetic Field

Hiroshi Ueda, Atsushi Ishiyama, Tohru Morisaki

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Trapped field characteristics are one of the key factors in the application of high-temperature superconducting bulk, such as magnetic levitation systems, motors, bulk magnets and so on. The immutable trapped field is required in superconducting bulk applications as a quasi-permanent magnet, however, the trapped field is influenced and changed by a time-varying external magnetic field in a realistic operational environment of electrical devices. This means that shielding current distribution within the bulk is changed by the time-varying magnetic field and the transient magnetic flux movement results in temperature rise and finally reduction of the trapped field. In this study, we observed the abrupt reduction of the trapped field for the external AC magnetic field in the range of frequency up to 50 Hz. And we also performed the numerical simulation using a newly developed computer program based on the finite element method (FEM). In the simulation program, the voltage-current (E–J) characteristics, which depend on the irreversibility temperature are taken into account. From these results, it can be considered that the abrupt reduction of the trapped field is caused by the temperature rise due to AC loss.

    Original languageEnglish
    Pages (from-to)1357-1364
    Number of pages8
    JournalIEEJ Transactions on Power and Energy
    Volume124
    Issue number11
    DOIs
    Publication statusPublished - 2004 Jan 1

    Fingerprint

    Magnetic fields
    Magnetic levitation
    Temperature
    Magnetic flux
    Current voltage characteristics
    Shielding
    Permanent magnets
    Magnets
    Computer program listings
    Finite element method
    Computer simulation

    Keywords

    • finite element method
    • high-temperature bulk superconductor
    • trapped field attenuation

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering

    Cite this

    Trapped Field Characteristic of YBCO Bulk in AC External Magnetic Field. / Ueda, Hiroshi; Ishiyama, Atsushi; Morisaki, Tohru.

    In: IEEJ Transactions on Power and Energy, Vol. 124, No. 11, 01.01.2004, p. 1357-1364.

    Research output: Contribution to journalArticle

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