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Cardelli E.,University of Perugia | Cardelli E.,Center for Electrical and Magnetic Applied Research
IEEE Transactions on Magnetics | Year: 2011

This paper deals with the modeling of vector fields that exhibit hysteresis. A general class of models of vector magnetizations with hysteresis that form a natural extension of the Classical Scalar Preisach Model is defined. Although the modeling was done for the 2-d case, the same theory can be extended to the 3-d case as well. After reviewing some general properties of conservative fields, the specific case of unit magnitude vector fields is discussed. The paper focuses on discussing the properties of a general vector hysteresis operator (hysteron). The mathematical approach followed here can be applied not only to the magnetic hysteresis, but also to any hysteresis process. Some examples of vector hysterons, deduced from the general definition, are presented and their properties analyzed. © 2011 IEEE. Source


Cardelli E.,University of Perugia | Cardelli E.,Center for Electrical and Magnetic Applied Research | Faba A.,University of Perugia | Faba A.,Center for Electrical and Magnetic Applied Research
Physica B: Condensed Matter | Year: 2014

This work discusses the vector measurement of the effective magnetic field inside a not oriented grain SiFe steel sample, taking into account the effect of the demagnetizing field. We propose an array of biaxial Hall sensors, placed up to the sample surface. The calibration of the system and a suitable extrapolation data strongly reduce the uncertainties of the direct measurement and provide an accurate evaluation of the magnetic field inside the material sample. Although the approach proposed can be also used for industrial frequencies, 50-60 Hz or more, the analysis is limited here to the static case, because we are mainly interested in static magnetic measurements. These measurements are especially useful for the vector characterization of soft magnetic materials and, in particular, for the identification and the experimental validation of vector hysteresis models. The experimental analysis presented in the paper deals with commercial not oriented grain SiFe steels. Experimental data about hysteresis loops and static power losses are given. © 2013 Elsevier B.V. Source


Cardelli E.,University of Perugia | Cardelli E.,Center for Electrical and Magnetic Applied Research | Faba A.,University of Perugia | Faba A.,Center for Electrical and Magnetic Applied Research
Physica B: Condensed Matter | Year: 2014

Abstract This paper presents an application of a vector hysteresis model to the prediction of the inrush current due the arbitrary initial excitation of a transformer after a fault. The approach proposed seems promising in order to predict the transient overshoot in current and the optimal time to close the circuit after the fault. © 2013 Elsevier B.V. Source


Cardelli E.,University of Perugia | Cardelli E.,Center for Electrical and Magnetic Applied Research | Faba A.,University of Perugia | Faba A.,Center for Electrical and Magnetic Applied Research
Physica B: Condensed Matter | Year: 2014

In this work we present an identification procedure for a vector hysteresis model defined by a H-moving approach. The model parameters are identified by means of a suitable implementation of a genetic algorithm with a set of experimental data. The analytical formulation of the model and the characteristics of the genetic algorithm used are described. A comparison between computed data and experimental measurements for a not oriented grain Si-Fe magnetic steel with a weak lamination anisotropy are reported. © 2013 Elsevier B.V. Source

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