Three-dimensional magnetic field numerical calculation by equivalent B-H method for magnetic field mitigation

Keisuke Fujisaki, Masahiro Fujikura, Jirou Mino, Shouij Satou

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The 3-D magnetic field numerical analysis of a full-scale magnetic shielding room is advantageously performed by using the equivalent B-H method. In the proposed numerical method, the magnetic anisotropy and the nonlinearity due to material magnetic saturation are taken into account, by directly introducing the magnetization characteristics of the considered materials. An equivalent element, which substitutes the plural finite elements having different material properties for a homogeneous one, is introduced to reduce the number of unknowns. When the equivalent B-H method is applied to a full-scale magnetic shielding room (length 5.8 m, width 3.3 m, height 3.3 m), the measured leakage magnetic flux density distribution is found to be in good agreement with the calculated one, proving the reliability of the proposed approach, which can be adopted in many large-scale electromagnetic field problems.

Original languageEnglish
Article number5424046
Pages (from-to)1147-1154
Number of pages8
JournalIEEE Transactions on Magnetics
Issue number5
Publication statusPublished - 2010 May 1


  • Equivalent B-H method
  • Equivalent element
  • Homogenization method
  • Magnetic anisotropy
  • Magnetic calculation
  • Magnetic saturation
  • Magnetic shield
  • Magnetization characteristics
  • Thin steel plate

ASJC Scopus subject areas

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


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