Surface charge analysis in Eddy current problems

Yasushi Fujishima, Shinji Wakao

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    To estimate the characteristics of electric machines that have conductors of complicated shape, it is effective to analyze the surface charge related to eddy current phenomena. However, the eddy current field is generally treated as a quasi-static field in which the displacement current is neglected and the electric field is not defined in the nonconductive region in the calculation process. Therefore, when we use only the A-φ finite element method (FEM) as a field analysis method, it is difficult to calculate the surface charge directly at the interface between conductive and nonconductive regions. In this paper, with this background, we propose a novel method of analysis of the surface charge based on both the A-φ FEM with edge elements and the integral equation. This approach enables us to precisely calculate the surface charge. Some numerical results that demonstrate the validity of the proposed method are also presented, such as the surface charge analysis of linear induction motors for evaluating the relationships among the surface charge, eddy current, and conductor shape.

    Original languageEnglish
    Pages (from-to)59-66
    Number of pages8
    JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
    Volume145
    Issue number1
    DOIs
    Publication statusPublished - 2003 Oct

    Fingerprint

    Surface charge
    Eddy currents
    Finite element method
    Electric machinery
    Linear motors
    Induction motors
    Integral equations
    Electric fields

    Keywords

    • Coulomb gauge
    • Eddy current
    • Edge finite element method
    • Electric scalar potential
    • Surface charge

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Cite this

    Surface charge analysis in Eddy current problems. / Fujishima, Yasushi; Wakao, Shinji.

    In: Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi), Vol. 145, No. 1, 10.2003, p. 59-66.

    Research output: Contribution to journalArticle

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