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EFFECT OF MECHANICAL STRAINS ON THE MAGNETIC PROPERTIES OF ELECTRICAL STEELS

V. E. Iordache1,* , E. Hug1

Affiliation

  1. Laboratoire Roberval, UMR UTC-CNRS, Université de Technologie de Compiègne, Département Génie Mécanique, BP 20529, 60205 Compiègne, France

Abstract

The magnetic properties of steel laminations used as magnetic cores in electrical machines are very sensitive to mechanical strains resulting from manufacturing operations. This study presents an experimental in situ characterization of a non-oriented Fe-3%Si steel, a FeCo 2%V alloy and a high-purity polycrystalline nickel. The mechanical properties of study materials were determined under an monotonous uniaxial tensile test. Magnetic measurements were carried out under uniaxial tensile stresses approaching and exceeding the elastic limit se, as well as in the corresponding unloaded states. The deformation stages are clearly identified by the magnetic parameters. A linear relationship was found between the evolution of the magnetic behaviour and of the kinematic hardening X, representative of internal stress state of plastically strained specimens..

Keywords

Electrical steel, Tensile deformation, Magnetic measurements, Magneto-mechanical coupling, Internal stresses.

Submitted at: July 26, 2004
Accepted at: Dec. 6, 2004

Citation

V. E. Iordache, E. Hug, EFFECT OF MECHANICAL STRAINS ON THE MAGNETIC PROPERTIES OF ELECTRICAL STEELS, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 4, pp. 1297-1303 (2004)