Magnetic Properties of Electrical Steel Sheets in Respect of Cutting: Micromagnetic Analysis and Macromagnetic Modeling

Markus Hofmann, Hristian Naumoski, Ulrich Herr, Hans Georg Herzog

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82 Scopus citations

Abstract

This paper provides a quantitative analysis of the degradation of the magnetic properties of nonoriented electrical steel sheets caused by laser, guillotine, and spark erosion cutting as well as the healing effect of stress relief annealing. For this purpose, the macroscopic material characteristics, such as commutation curves, dynamic hysteresis loops, and magnetic power losses, are gained by single-sheet tester measurements. The experiments are conducted on specimens composed of strips of variable width to adjust different degrees of total degradation. The origin of the observed changes of the material is elucidated by micromagnetic measurements based on the magneto-optical Kerr effect that visualizes the domain patterns and wall movements near the cutting edges. A local magnetic contrast is defined, which serves as a quantitative measure for the local degree of deterioration. The use of homogenous parameters within a numerical loss model based on the principle of loss separation is theoretically justified and experimentally proved to provide correct values of the total magnetic power loss for arbitrary magnetizations in degraded steel sheets.

Original languageEnglish
Article number7286823
JournalIEEE Transactions on Magnetics
Volume52
Issue number2
DOIs
StatePublished - Feb 2016

Keywords

  • electrical steel sheet cutting
  • magnetic power losses
  • magneto-optical Kerr effect
  • numerical modeling

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