Surface Charge Analysis in Eddy Current Problems

Yasushi Fujishima, Shinji Wakao

Research output: Contribution to journalArticlepeer-review


To estimate characteristics of electric machines that have conductors with complex form, it is effective to analyze the surface charge concerned with eddy current phenomena. However, the eddy current field is generally treated as quasi-static field in which the displacement current is neglected and the electric field is not defined in the non-conductive region in the calculating process. Therefore, when we adopt only the A-Ø FE method as a field analysis method, it is difficult to directly calculate the surface charge at the interface between conductive and non-conductive regions. In this paper, with this background, we propose a novel analysis method of the surface charge based both on the A-Ø formulation of 3D edge FE method and on the integral equation. This approach enables us to precisely calculate the surface charge. Some numerical results, which demonstrate the validity of the proposed method, are also presented, e.g., 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)633-639
Number of pages7
Journalieej transactions on industry applications
Issue number6
Publication statusPublished - 2002 Sept 1


  • coulomb gauge
  • eddy current
  • edge finite element method
  • electric scalar potential
  • surface charge

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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