35 ème Colloque de Métallurgie de l'INSTN
MATERIAUX MAGNETIQUES
PROGRES ET PERSPECTIVES

J. Phys. IV France 02 (1992) C3-47-C3-51
DOI: 10.1051/jp4:1992306

Etude du comportement magnétique d'alliages Fe-3%Si non-orientés, utilisés dans la conception de machines électriques

F. DUMAS¹, E. HUG², M. CLAVEL² and J.L. ILLE<sup>1

1</sup>  Division Electromécanique, Département Génie Mécanique, Centre de Recherches de Royallieu, Université de Technologie de Compiègne, BP. 649, 60206 Compiègne cedex, France
²  Division Electromécanique et Division Mécanique LG2MS, Département Génie Mécanique, Centre de Recherches de Royallieu, Université de Technologie de Compiègne, BP. 649, 60206 Compiègne cedex, France

Abstract
The prediction of core losses in a rotating electrical machine has been estimated by a numerical finite element method and the use of power losses mesurement on a toroidal magnetic lamination (taking account of anisotropy) under sinusoidal induction. The predicted core losses are 40% lower than the mesured ones. This excess can be attribued to harmonics due to the rotor rotation and modification of the magnetic properties of the material due to the lamination punching and core assemblage. Mechanical tests and microstructural observations carried out on non-oriented 3%Si-Fe magnetic sheets showed that the magnetic domain structure is quickly destroyed under 0 to 5% deformation. Correspondingly, the dislocation density increases following the experimental law : Log(ρ_d) α + ε (α, = constants). These results are suggested to be related to the magnetic properties alteration due to the sheet forming.

© EDP Sciences 1992