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CONTRIBUTION A LA MODELISATION DE LA DYNAMIQUE
D'AIMANTATION DANS LES MATERIAUX MAGNETIQUES DOUX : CARACTERISATION ET SIMULATION

Abstract : Soft magnetic materials (Fe, Ni, Co, ... amorphous, crystal or poly-crystal) are used in power electrical engineering to convert energy, to guide flux lines and to transmit information. Their main characteristic is to be easilly magnetised. They are also conducting and free currents are induced with time harmonics and transient signals. These last can be classicaly diffused at the macroscopic scale but also and
mainly locally induced in a moving microscopic magnetic structure. These damping effects and dynamic losses have got several consequences: power losses, time delay, signal distortion, remanence. We are interested in faithful models in order to understand soft
materials static and dynamic properties and to compute power electrical devices with accuracy. We have chosen to focus on microscopic eddy currents in addition to macroscopic ones, because they are at the origin of the dynamic hysteresis which is observed and measured.
After introducing the set of problems, stakes and state of the art; we began to build a theoretical material representation at the mesoscopic scale, between the microscopic and macroscopic ones, usable in material science and numerical simulation tools. So Matter-
Field Equations have been derived again with the physics of dynamic magnetisation reversal processes.
Then we tried to analyse the relevance and limits of our representation thanks to analytical calculations on simple and academic problems. We also carried out some calculations, measurements and experimental characterisations to confront theory and reality.
Finally, we have written, with the Finite Element Method, some dedicated electromagnetic formulations in 3-D and 2-D. We have confirmed them with simple test cases always comparing with standard and previous results, analytical calculations and experimental observations. First simple configurations of circuit breaking applications have also been investigated, studied and computed.
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Olivier Maloberti. CONTRIBUTION A LA MODELISATION DE LA DYNAMIQUE
D'AIMANTATION DANS LES MATERIAUX MAGNETIQUES DOUX : CARACTERISATION ET SIMULATION. Energie électrique. Institut National Polytechnique de Grenoble - INPG, 2006. Français. ⟨tel-00156657⟩

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