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Caractérisation et modélisation du comportement thermomagnétique d'alliages FeNi pour le prototypage virtuel

Abstract : The advent of Electrical Engineering has been accompanied since its beginning, by the research of high performance ferromagnetic materials for the realization of the central element of electromagnetic devices, the magnetic core/circuit. These materials initially consisting of iron were alloyed with silicon, cobalt and nickel for more energy efficiency. For a given device, the material must be designed to meet the requirements of the application (magnetic performances, mechanical and thermal characteristics...and cost. The frequency and the operating temperature are, among others, important parameters to be taken into account. Among these materials, the FeNi alloys, although they are industrially mature, see new markets opened to them thanks to their certain specific characteristics and the innovations brought by the manufacturers of these materials. This work is a continuation of ongoing researches in AMPERE laboratory dealing with thebehavioral models of magnetic materials taking into account the effects of temperature. Indeed, there is a trend in a growing number of electromagnetic devices to require high performance and compactness or integration. Thus, in this context, the magnetic circuits are subjected to physical and thermal stresses that are becoming more and more stringent. It is therefore necessary to resort to the experimental characterization and modeling of the behavior of ferromagnetic materials, particularly the FeNi alloys, in order to integrate them into the design and optimization tools of these devices. To do so, we have implemented an appropriate experimental bench, andachieve many and long experiments to develop advanced behavioral models of these materials. These models were then tested on a particularly sensitive application in the field of safety of persons, the differential protection system where the magnetic circuit (of Fe-50% Ni or Supra50) is a very important part of performance and reliability. Finally, new low Ni content FeNi (Cr, Cu) alloys provided by Aperam Research Center in Imphy, were studied in order to test their ability to replace the usual Supra50 alloy in these systems. The final aim is to propose new economic FeNi alloys suitable for the manufacture of the magnetic circuit of industrial ground fault circuit-breaker relay.
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Oualid Messal. Caractérisation et modélisation du comportement thermomagnétique d'alliages FeNi pour le prototypage virtuel. Energie électrique. Université Claude Bernard - Lyon I, 2013. Français. ⟨NNT : 2013LYO10304⟩. ⟨tel-01130120⟩

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