1,721,013 research outputs found
Vector hysteresis measurements of not oriented grain SiFe steels by a biaxial hall sensors array
No full textThis 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
Vector Hysteresis Measurements via a Single Disk Tester
No full textIn this paper we present a single disk tester (SDT) developed for vector hysteresis measurements of magnetic steels. The measurement system deals with a stator of a 3-phase induction motor and some suitable magnetic field and magnetic induction probes. Numerical calculations based to a FEM approach in time domain and experimental tests are shown in order to describe both accuracy and efficiency of this measurement system
Analysis of a Unit Magnetic Particle Via the DPC Model
No full textThis paper presents a discussion of the properties and the behavior of an unit magnetic particle as calculated by the DPC (Della Torre,
Pinzaglia and Cardelli) model. The general mathematical expressions of the vector field generated by the unit magnetic particle are
derived in a special regular parametric coordinates system. It is shown that, in a special case, the DPC model leads to the same results as in the Stoner-Wohlfarth dealing with the physics of an ellipsoidal, single-domain, uniaxial magnetic particle. Some numerical examples for a possible use of the DPC model in the analysis of nanomagnetic samples are presented
Magnetic material modeling for the optimization of the electrical machine design
No full textThe paper deals with the modeling of the magnetic materials used for electrical machines. The model proposed is able to simulate the magnetization processes of the NOG and OG steels which are usually used in the magnetic core of electrical motors, generators and transformers. For the validation of the model we present some experiments about the prediction of transformer inrush currents, in particular the simulation results are compared with the measurements
Numerical two-dimensional modeling of grain oriented steel
No full textIn this paper, we discuss a phenomenological approach for the numerical modeling of static hysteresis of grain oriented (GO) steels at macro-magnetic scale. The modeling is inspired to a generalization in 2-d of the Preisach model (this generalization can be easily extended in 3-d, but it is not necessary here), and the magnetization dependent state of the model parameters is represented by two distinct vectors, named the interaction field and the operative field, suitably defined. In this way, the very complex behavior of the GO steel circularly or linearly polarized is reproduced with accuracy, as shown in the numerical tests reported in the paper
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