Papers by Marie-Ange Raulet
L'optique de cette these est de contribuer a la modelisation des regimes permanents et transi... more L'optique de cette these est de contribuer a la modelisation des regimes permanents et transitoires de fonctionnement des machines asynchrones a cage d'ecureuil par la resolution pas a pas de l'equation du champ. La mise en uvre de cette modelisation necessite d'une part, la prise en consideration du mouvement du rotor qui est effectuee par la technique du macro-element et, d'autre part, de tenir compte de la presence des courants de foucault ce qui implique une discretisation temporelle de l'equation du champ. La comparaison des resultats des simulations et des releves experimentaux permet de verifier la validite du modele mis en uvre. Ce modele est ensuite utilise pour l'etude des influences de l'effet pelliculaire des courants rotoriques et des caracteristiques de la cage. Ce memoire se compose de trois chapitres: 1) rappel des methodologies de resolution et des differentes procedures permettant la prise en compte du mouvement du rotor; 2) presenta...
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Journal of Magnetism and Magnetic Materials
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International audienceNowadays, nanocrystalline soft magnetics materials for high power applicati... more International audienceNowadays, nanocrystalline soft magnetics materials for high power applications receive more and more consideration. Nevertheless, some technological parameters can have an influence of potential significance on the performances (losses, permeability, frequency behavior…). One main drawback of the nanocrystalline materials is their brittleness. To prevent this effect in order to handle the Magnetic Circuit (MC), it is preferable to impregnate it with varnish. Moreover, thanks to the impregnation, the MC can be cut in order to insert the winding. In this paper, the influence of various technological manufacturing processes on the magnetic properties of nanocrystalline cores is studied. Firstly, nanocrystalline magnetic cores of the same size, without impregnation and with three different varnishes, are experimentally characterized with a hysteresigraph (from DC to 1 MHz). Secondly, the same MC were cut in and characterized again. This protocol gives information a...
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HAL (Le Centre pour la Communication Scientifique Directe), Jul 6, 2021
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HAL (Le Centre pour la Communication Scientifique Directe), Jul 3, 2018
International audienc
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Canadian Journal of Electrical and Computer Engineering, 2017
In the future, medium-frequency transformers (with a frequency range of 5–100 kHz) will be major ... more In the future, medium-frequency transformers (with a frequency range of 5–100 kHz) will be major components in dc–dc converter applications, for both medium-voltage direct current and high-voltage direct current networks. Importantly, the corresponding power losses should be accurately calculated in order to reach performance targets (very high efficiency). This paper reviews the most known analytical models that are used to calculate the medium-frequency resistance for several winding technologies. In order to qualify these models in a future design flow, we compare the analytical model results with measurements and 3-D finite-element electromagnetic simulations and the impact on the warming. The adopted design flowchart has been tested on a 17-kHz 180-kVA prototype transformer that will be used in a dual active bridge.
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HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific ... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et a ̀ la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Analysis of elite swimmers ’ activity during an instrumented protocol
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2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe), 2017
Medium frequency transformers are an essential part of new energy conversion systems, and are ver... more Medium frequency transformers are an essential part of new energy conversion systems, and are very often subject to non-sinusoidal excitation. Therefore, usual methods to represent magnetic materials behavior inside transformers with electrical equivalent scheme are very limited in this case. This paper focuses on the development of a new model based on the loss separation method. This model is implemented in a circuit simulation software with the VHDL-AMS modeling language to represent the behavior of a flux tube: non-linearity, hysteresis and losses. It allows to obtain relevant results for any excitation waveform as the model is temporal. The developed model was compared with experimental results on a small-scale nanocrystalline transformer prototype and it remains very accurate regarding the hysteresis cycle shape and core losses over a wide frequency range, and also for different waveforms.
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Transformers are magnetic components widely used in switched-mode power electronics systems. The ... more Transformers are magnetic components widely used in switched-mode power electronics systems. The non-linear hysteresis behavior of the magnetic material and the high frequency effects in both core and windings have significant effects on system's efficiency, reliability and power losses. This behavior can be modeled using simple fast models or complex accurate models in order to predict and improve the transformer behavior before realization. This paper is summarized by proposing a non-linear dynamic model of transformers for use in circuit simulators. This model allows winding and core modeling including the material's accurate nonlinear dynamic hysteresis behavior. The magnetic component model is implemented in the circuit simulation software " Simplorer " using VHDL-AMS modeling language. It is validated for a medium-frequency nanocrystalline core transformer. Effects of frequency and waveform on computed efficiencies are discussed and validated thanks to experi...
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Un des enjeux majeur du projet de conception de « l'avion plus electrique » est l'augment... more Un des enjeux majeur du projet de conception de « l'avion plus electrique » est l'augmentation de l'efficacite energetique tout en reduisant la masse et le volume. Cela engendre une grande compacite des composants electriques et en consequence une elevation des temperatures de fonctionnement. Les materiaux magnetiques qui sont au cœur de la conversion d'energie electrique sont, alors, amenes a travailler dans des conditions de temperatures elevees. Leur vieillissement thermique devient un probleme serieux qui merite une attention particuliere. Les materiaux nanocristallins ont ete choisis pour cette etude de vieillissement car ils sont de plus en plus employes dans les systemes d'electronique de puissance. Le suivi des proprietes magnetiques macroscopiques de ces materiaux est fait a l'aide d'un protocole de caracterisations electriques et magnetiques.
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Nanocrystalline materials have very low losses compared to standard iron-silicium, amorphous mate... more Nanocrystalline materials have very low losses compared to standard iron-silicium, amorphous materials and can work at higher inductions than ferrite materials. It makes them a good candidate for high power medium frequency transformer applications. However, manufacturing processes such as impregnation or cut significantly increase magnetic losses, as shown previous studies. Some other manufacturing processes of nanocrystalline cores can also impact magnetic properties. The core shape (toroidal, oval, C-core), the ribbon width and the ribbon shearing impact on magnetic properties will all be studied. For each of these cases, magnetic properties will be evaluated before and after impregnation and cut because these manufacturing processes have a huge impact on magnetic properties and can be coupled to the new manufacturing processes we want to study in this paper. The objectives of this study are to, firstly, be able to make a better choice of nanocrystalline cores and secondly, know ...
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2020 Fifteenth International Conference on Ecological Vehicles and Renewable Energies (EVER), 2020
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IEEE Transactions on Magnetics, 2018
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Journal of Magnetism and Magnetic Materials, 2017
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Journal of Electronic Materials, 2015
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2015 IEEE Electrical Power and Energy Conference (EPEC), 2015
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European Journal of Electrical Engineering, 2012
The aim of this study consists in comparing the contributions of two static hysteresis models (ch... more The aim of this study consists in comparing the contributions of two static hysteresis models (chemical" model and Jiles-Atherton's) in dynamic representation of magnetic behaviour using the magnetic diffusion problem. To improve the performance of both static hysteresis models in the magnetic diffusion equation, it has been homogenized and tests have been performed on a toroidal core of non-oriented FeSi sheets. The material has been excited at a rather low frequency in order to avoid the skin effect. Tests have been made first for excitations leading to major loops then for specific waveforms to obtain minor loops and recoil lines. Results for both models are quantified in terms of accuracy, convergence and computing time. Cet article compare les apports des modeles d'hysteresis statiques " chimique " et de Jiles-Atherton pour la representation dynamique d'un materiau par la diffusion magnetique. Afin de mettre en valeur les performances de chacun des deux modeles d'hysteresis statiques dans l'equation de diffusion magnetique, cette derniere est homogeneisee et des tests sont effectues sur un echantillon torique constitue d'un empilement de rondelles de FeSi a GNO de faible epaisseur. Le materiau est excite a une frequence reduite afin de ne pas provoquer l'apparition de l'effet de peau. Des essais sont operes dans un premier temps pour des excitations conduisant a des cycles majeurs et mineurs centres puis, dans un deuxieme temps, pour des formes d'ondes particulieres amenant a l'obtention de cycles de recul ou de boucles mineures decentrees. Les resultats obtenus pour les deux modeles sont quantifies en termes de precision, de convergence et de temps de calcul.
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Papers by Marie-Ange Raulet