Trapped field characteristic of HTS bulk in AC external magnetic field

Hiroshi Ueda, Manabu Itoh, Atsushi Ishiyama

    Research output: Contribution to journalArticle

    30 Citations (Scopus)

    Abstract

    Although immutable trapped field Is required in superconducting bulk applications as a quasipermanent magnet, the trapped field is influenced and changed by time-varying external magnetic field in a realistic operational environment of electrical devices. This means that shielding current distribution within 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 paper, we experimentally investigated the transition of trapped field while applying external AC magnetic field with various amplitude and frequency to a disk-shaped YBCO bulk. And we also numerically investigate the relationship between characteristic of trapped-field attenuation and shielding current distribution within the bulk using a newly developed simulation program. This program is based on the finite element method (FEM) considering the voltage-current (E-J) characteristics. It is found that the shielding current distribution is dependent on frequency of AC external field and trapped field attenuation is closely related to the shielding current.

    Original languageEnglish
    Pages (from-to)2283-2286
    Number of pages4
    JournalIEEE Transactions on Applied Superconductivity
    Volume13
    Issue number2 II
    DOIs
    Publication statusPublished - 2003 Jun

    Fingerprint

    Shielding
    shielding
    alternating current
    current distribution
    Magnetic fields
    magnetic fields
    attenuation
    Magnetic flux
    Magnets
    magnetic flux
    finite element method
    magnets
    Finite element method
    Electric potential
    electric potential
    simulation
    Temperature
    temperature

    Keywords

    • AC loss
    • FEM
    • HTS bulk
    • Trapped field

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Physics and Astronomy (miscellaneous)

    Cite this

    Trapped field characteristic of HTS bulk in AC external magnetic field. / Ueda, Hiroshi; Itoh, Manabu; Ishiyama, Atsushi.

    In: IEEE Transactions on Applied Superconductivity, Vol. 13, No. 2 II, 06.2003, p. 2283-2286.

    Research output: Contribution to journalArticle

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