Numerical calculations of electromagnetic fields in silicon steel under mechanical stress

Keisuke Fujisaki, Shouji Satoh

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


We present a finite-element method for numerical calculation of electromagnetic fields in silicon steel that takes into account the effect of mechanical stress on the steel's mechanical properties. The effect of the mechanical stress is considered in terms of the magnetic permeability in each element. To evaluate the usefulness of the calculation method, we have applied it to an electric motor under uniform and nonuniform mechanical stress distribution. In case of uniform stress distribution, the iron loss distribution is uniform too. The area of increased iron loss corresponds to the area where the mechanical compressive stress is applied. In case of nonuniform mechanical stress distribution, the magnetic flux flows so as to avoid the mechanical compression stress area. The iron loss has a tendency to increase further under mechanical compressive stress because of the increase of the magnetic flux density in the zone of no mechanical stress and the poorer characteristics of the iron loss as a function of magnetic flux density under mechanical compressive stress.

Original languageEnglish
Pages (from-to)1820-1825
Number of pages6
JournalIEEE Transactions on Magnetics
Issue number4 I
Publication statusPublished - 2004 Jul
Externally publishedYes


  • Electrical motor
  • Electromagnetic field calculation
  • Finite-element method
  • Magnetic characteristics
  • Mechanical stress
  • Silicon steel

ASJC Scopus subject areas

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


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