A viscous-type dynamic hysteresis model as a tool for loss separation in conducting ferromagnetic laminations (original) (raw)
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A Novel Hysteresis Core Loss Model for Magnetic Laminations
IEEE Transactions on Energy Conversion, 2011
A general dynamic hysteresis core loss model has been developed. Experimental data for different lamination thicknesses have been measured and analyzed at various frequencies. Based on the analysis, a dynamic hysteresis finite element core loss model is established and validated by experiments. The developed dynamic hysteresis model is simple and efficient, and has been shown to be very accurate compared with the experiments. Moreover, the model can calculate core losses based on the input parameters obtained from experimental measurements at only one single frequency in a thin lamination. The model, to our best knowledge, is the first one that is capable of calculating core losses for different thicknesses of materials and different operating frequencies, without a massive experimental database. In addition, only the eddy current and hysteresis models are necessary for this calculation but with the important addition of the variation of the flux density within the lamination.
Physica B: Condensed Matter, 2014
We propose a simplified dynamic hysteresis model for the prediction of magnetization behavior of electrical steel up to high frequencies, taking into account the skin effect. This model has the advantage of predicting the hysteresis loop and loss behavior versus frequency with the same accuracy provided by the Dynamic Preisach Model with a largely reduced computational burden. It is here compared to experimental results obtained in Fe-Si laminations under sinusoidal flux up to 2 kHz.
Modeling of Hysteresis Losses in Ferromagnetic Laminations under Mechanical Stress
IEEE Transactions on Magnetics, 2015
A novel approach for predicting magnetic hysteresis loops and losses in ferromagnetic laminations under mechanical stress is presented. The model is based on combining a Helmholtz free energy -based anhysteretic magnetoelastic constitutive law to a vector Jiles-Atherton hysteresis model. This paper focuses only on unidirectional and parallel magnetic fields and stresses, albeit the model is developed in full 3-D configuration in order to account also for strains perpendicular to the loading direction. The model parameters are fitted to magnetization curve measurements under compressive and tensile stresses. Both the hysteresis loops and losses are modeled accurately for stresses ranging from –50 to 80 MPa.
Journal of Applied Physics, 1997
Dynamic hysteresis loop shapes and magnetic power losses are studied in nonoriented Fe-Si laminations exhibiting significant excess losses. Measurements are carried out under controlled sinusoidal induction in the frequency range from 1 Hz to 1.6 kHz, at various peak inductions from 0.25 to 1.5 T. Excess losses are found to obey a f 3/2 law up to frequencies of 200-400 Hz, depending on peak induction. Beyond this limit, definite deviations are observed, due to eddy current shielding. Detailed information on the flux and field distribution in this high frequency regime is obtained by finite element solutions of Maxwell equations employing the dynamic Preisach model to describe quasi-static hysteresis and dynamic wall processes. The agreement between theoretical predictions and measurements is discussed.
IEEE Transactions on Industry Applications, 2012
To study the fundamental essence of core losses and to achieve an accurate core loss separation formula, a dynamic finite-element model for the nonlinear hysteresis loop of laminations has been established. In the model, Maxwell's equations are solved for the hysteresis character in the magnetic lamination, using the Galerkin finite-element method, where the hysteresis is represented by an energetic hysteresis model. Based on the simulation results, the magnetic characteristics, skin effect, time delay, and magnetic field distribution are discussed. Then, core losses, particularly excess losses, affected by the magnetic characteristics are carefully examined. It is concluded that excess current loss formula is only applicable for the cases where skin effect is negligible and the sum of hysteresis losses and eddy current losses can more generally represent total losses. Index Terms-Ferroelectric hysteresis, loss measurement, magnetic core losses.
Iron losses under PWM excitation using a dynamic hysteresis model and finite elements
IEEE Transactions on Magnetics, 2000
A dynamic hysteresis model is used with a 2-D magnetic vector potential finite element formulation. The scheme models traditional eddy current, static BH and anomalous losses. The model is used to predict the BH trajectory and hence the losses for a FeSi lamination with a PWM type excitation. The experimental results show good agreement with the finite element predictions.
Power losses in thick steel laminations with hysteresis
Journal of Applied Physics, 1996
Magnetic power losses have been experimentally investigated and theoretically predicted over a range of frequencies ͑direct current-1.5 kHz͒ and peak inductions ͑0.5-1.5 T͒ in 1-mm-thick FeSi 2 wt. % laminations. The direct current hysteresis properties of the system are described by the Preisach model, with the Preisach distribution function reconstructed from the measurement of the recoil magnetization curve ͑B p ϭ1.7 T͒. On this basis, the time behavior of the magnetic induction vs frequency at different lamination depths is calculated by a finite element method numerical solution of Maxwell equations, which takes explicitly into account the Preisach model hysteretic B(H) relationship. The computed loop shapes are, in general, in good agreement with the measured ones. The power loss dependence on frequency is predicted and experimentally found to change from a ϳf 3/2 to a ϳf 2 law with increasing peak induction.
Computation of electromagnetic losses including stress dependence of magnetic hysteresis
Journal of Magnetism and Magnetic Materials, 1999
An internal variable magnetic hysteresis model accounting for stress dependence is implemented in a 2D finite element model, in order to investigate the effect of an elastic stress on the field and eddy current distributions in electrical steels. Hysteresis and eddy current losses in a non oriented 3%FeSi lamination are computed and discussed for various excitation field magnitudes. <c, 1999 Elsevier Science B.V. All rights reserved.
IEEE Transactions on Magnetics, 2000
This paper investigates the interdependence of hysteresis and eddy-current losses in magnetic cores. Based on the results of a numerical model developed for the analysis, the magnetodynamic loss phenomena are found to be distinctly interdependent. Because of the effects of eddy currents on the flux distribution in the lamination depth, hysteresis and excess losses show a dependence on eddy currents, and hence, on the excitation frequency. Eddy-current and excess losses, on the other hand, are affected by the magnetic characteristics of the material where hysteresis plays the role of a damper. An application of the model to a rotating electrical machine has showed that the interdependence between the losses is quite significant.