Calculation of Losses in Laminated Ferromagnetic Materials

Sebestyén, Imre; Gyimóthy, Szabolcs; Pávó, József; Bíró, Oszkár

doi:10.1109/tmag.2004.824894

Cited by 19 publications

(4 citation statements)

References 7 publications

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“…e.g. [6,12,14,17,19]). The main idea is to replace physical parameters with equivalent (or homogenized) parameters for Maxwell's equations.…”

Section: ∂B ∂Tmentioning

confidence: 99%

An Efficient Eddy Current Model for Nonlinear Maxwell Equations with Laminated Conductors

Jiang¹,

Zheng²

2012

SIAM J. Appl. Math.

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In this paper, we propose a new eddy current model for the nonlinear Maxwell equations with laminated conductors. Direct simulation of three-dimensional (3D) eddy currents in grain-oriented (GO) silicon steel laminations is very challenging since the coating film over each lamination is only several microns thick and the magnetic reluctivity is nonlinear and anisotropic. The system of GO silicon steel laminations has multiple sizes and the ratio of the largest scale to the smallest scale can amount to 10 6. The new model omits coating films and thus reduces the scale ratio by 2-3 orders of magnitude. It avoids very fine or very anisotropic mesh in coating films and can save computations greatly in computing 3D eddy currents. We establish the wellposedness of the new model and prove the convergence of the solution of the original problem to the solution of the new model as the thickness of coating films tends to zero. The new model is validated by finite element computations of an engineering benchmark problem-Team Workshop Problem 21 c-M1.

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“…e.g. [6,12,14,17,19]). The main idea is to replace physical parameters with equivalent (or homogenized) parameters for Maxwell's equations.…”

Section: ∂B ∂Tmentioning

confidence: 99%

An Efficient Eddy Current Model for Nonlinear Maxwell Equations with Laminated Conductors

Jiang¹,

Zheng²

2012

SIAM J. Appl. Math.

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“…This can be efficiently carried out by using commercial packages like MCS/EMAS [79], Ansys/Emag [42,89] or in-house codes [6,7,15,26,71,80] utilizing the Finite Element Method (FEM). The electromagnetic analysis yields the local distribution of volumetric heat sources within the core, the coils and other conducting parts like tank, clamping plates, shields.…”

Section: Local Volumetric Heat Sources-coupling With Electromagnetic mentioning

confidence: 99%

Numerical Simulation and Experimental Validation of Coupled Flow, Heat Transfer and Electromagnetic Problems in Electrical Transformers

Smołka

Bíró

Nowak

2009

Arch Computat Methods Eng

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The paper presents a state-of-the-art of the numerical modeling of the coupled problems involving heat, fluid flow and electromagnetic phenomena in electrical transformers. Mathematical descriptions of both Computational Fluid Dynamics (CFD) and electromagnetic (EMAG) models are given. Since these models include other submodels for a definition of boundary conditions as local and temperature-dependent convective and radiative heat fluxes, heat generation terms, temperature-dependent and effective values of material properties for different constructions of coils etc., the component problems published in a subject literature are also reported. Moreover, a coupling procedure of the CFD and EMAG solutions to examine the specific power losses within coils and a core is outlined. On the basis of the mathematical model, a numerical example of a three phase medium-power dry-type electrical transformer is presented. A validation of the numerical calculations is performed using the experimental transformer temperature tests in the short-circuit, open-circuit, and under rated parameters according to the current European Standards for dry-type transformers. During the tests, temperatures were measured at selected points on transformer elements using thermocouples and thermometers, while on the external tank walls an infrared thermography was employed.

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“…This problem has received a considerable attention in past decades. Many papers deals with iron losses due to eddy currents in the electrical steel laminations of machines (Del Vecchio, 1982;Silva et al, 1996;Mayergoyz, 1998;Gyselinck et al, 1999;Sebestyen et al, 2004). Losses can also be calculated for arbitrary induction waveforms (Lavers and Biringer, 1976;Rajakovic and Semiyen, 1989;Deng and Nehl, 1998) and with a model including minor hysteresis loops (Barbisio et al, 2004).…”

Section: High Frequency Small Signal Model Of Laminationsmentioning

confidence: 99%

High frequency extension of non‐linear models of laminated cores

Roger

Napieralska‐Juszczak

Henneton

2006

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -The paper gives a new measurement method of the parameters characterising the magnetic laminations for broadband low-level signals defined at any operational point. Design/methodology/approach -High frequency phenomena machines fed by PWM inverters are related to low-level signals corresponding to minor hysteresis loops around the instantaneous working point, which moves on the main loop at the basic frequency. The minor loops are assimilated to ellipses, which are characterised by only two parameters: the incremental magnetic permeability (m) and the electric conductivity (s).Findings -For small signals high frequency field components, the laminated steel behaviour can be described by two local parameters (m, s) and skin effect. The values of m and s do not depend on frequency up to 1 MHz, but only on the operating point.Research limitations/implications -The proposed broadband characterisation should be associated with a Priesach model that defines the operating point for computer simulation of high frequency phenomena. Practical implications -The broadband characterisation of magnetic laminations is useful for studying the behaviour of the windings of the PWM-fed machines. Originality/value -Broadband measurements are now possible on small magnetic steel lamination samples.

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Calculation of Losses in Laminated Ferromagnetic Materials

Cited by 19 publications

References 7 publications

An Efficient Eddy Current Model for Nonlinear Maxwell Equations with Laminated Conductors

An Efficient Eddy Current Model for Nonlinear Maxwell Equations with Laminated Conductors

Numerical Simulation and Experimental Validation of Coupled Flow, Heat Transfer and Electromagnetic Problems in Electrical Transformers

High frequency extension of non‐linear models of laminated cores

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