Optimization of electromagnetic and magnetic shielding using ON/OFF method

Norio Takahashi, Shunsuke Nakazaki, Daisuke Miyagi

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


The ON/OFF method which was developed for the static field problem is extended to the dynamic field problem. We applied the ON/OFF sensitivity method to the steady state linear eddy current problem in order to determine the optimal topology of the electromagnetic and magnetic shield. As a result, a surprising optimal shape of electromagnetic and magnetic shield, which we could not imagine beforehand can be obtained using the ON/OFF method. A criterion of how to choose the sensitivity with respect to the reluctivity or conductivity is discussed. It is shown that the ON/OFF method can be used for the design of electromagnetic or magnetic shielding, even when the material is the magnetic steel sheet which have two kinds of variables, magnetic permeability and conductivity. The best shielding configuration can be obtained for each frequency by adopting the result with a larger design sensitivity.

Original languageEnglish
Article number5512852
Pages (from-to)3153-3156
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number8
Publication statusPublished - 2010 Aug


  • Eddy current problem
  • ON/OFF method
  • electromagnetic shielding
  • magnetic shielding
  • step-by-step method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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