Three-Dimensional Eddy-Current Analysis in Steel Laminations of Electrical Machines as a Contribution for Improved Iron Loss Modeling

Handgruber, Paul; Stermecki, Andrej; Bíró, Oszkár; Belahcen, Anouar; Dlala, Emad

doi:10.1109/tia.2013.2260713

Cited by 41 publications

(18 citation statements)

References 25 publications

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“…Since the voltage induced will be identical in both cases, the eddy current losses will be largely overestimated in the xy plane modeling. The ratio of the resistances seen by the eddy current in x and z axes is: (4) This means that in order to have equal losses in both cases, we should choose the resistivity in the z axis as: (5) With this simple modification, we can now simulate the lamination sheet as a massive conductor and, similar to 3D FE, calculate the eddy current losses directly as follows:…”

Section: Lamination Considered As Conductive Materialsmentioning

confidence: 99%

“…For example, as an improvement, approximations may be used to take account of the eddy current effect in the field solution as in [1]. Accurate predictions are also possible with 3D FE [2]- [4] and coupled 2D and 1D FE [5]- [6], however, their implementation requires more effort than conventional 2D FE method. As a new approach, this paper shows that the laminations can be considered as conductive material in 2D FE, and by a simple modification of their resistivity, eddy current losses can be accurately predicted in many lamination geometries.…”

Section: Introductionmentioning

confidence: 99%

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New Approach for Accurate Prediction of Eddy Current Losses in Laminated Material in the Presence of Skin Effect With 2-D FEA

2016

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Two-dimensional (2D) finite element (FE) models normally assume the laminated core as non-conductive material, therefore the damping effect of the eddy currents are ignored in the field solution. Besides, the use of integrated iron loss models in FE software could result in overestimated eddy current losses at high frequencies if the skin-effect is ignored. This paper presents a simple way for accurate prediction of eddy current losses in laminations with finite element analysis (FEA). An experimental set-up along with the simulation models are used to demonstrate the validity of the method. The utility of this method in loss separation and identification of loss coefficients in the presence of skin effect is also illustrated. This method is also applied to a synchronous permanent magnet machine with sinusoidal current.Index Terms-Eddy currents, finite element analysis, magnetic losses, skin effect. 0018-9464 (c)

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Section: Lamination Considered As Conductive Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New Approach for Accurate Prediction of Eddy Current Losses in Laminated Material in the Presence of Skin Effect With 2-D FEA

2016

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“…Brute force 3-D standard FEM (SFEM) models are still too expensive [1] for routine simulations. To avoid them, the problem is solved using the ideas of the MSFEM [2] and the 2-D/1-D methods [3], [4], which are very efficient for this specific purpose.…”

Section: Introductionmentioning

confidence: 99%

Air Gap and Edge Effect in the 2-D/1-D Method With the Magnetic Vector Potential ${A}$ Using MSFEM

Hollaus

Schobinger

2020

IEEE Trans. Magn.

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Eddy currents (ECs) are simulated in a single laminate, representing the whole core of an electrical machine. Despite this drastic reduction in the complexity of the problem, a 3-D finite-element model turns out to be still too expensive for simulations. To overcome this difficulty, 2-D/1-D methods are used. This article presents a solution to consider both air gap and edge effect (EE) based on the multiscale finite-element method (MSFEM) using the magnetic vector potential (MVP) A. Linear material properties are assumed; therefore, this article is carried out in the frequency domain. The new 2-D/1-D MSFEM is discussed, and various simulation results are presented. Index Terms-2-D/1-D method, eddy-current (EC) problems, edge effect (EE), iron core, lamination, magnetic vector potential (MVP) A, multiscale finite-element method (MSFEM).

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“…magnetic stray fields can be neglected; thus, each laminate is exposed to the same electromagnetic field distribution and therefore a simulation of a single laminate suffices, (Bottauscio and Chiampi, 2002;Rasilo et al, 2011). A 2D problem is solved essentially reducing the computational costs compared to brute force 3D finite element method (FEM) models (Handgruber et al, 2013;Schöbinger et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

A MSFEM to simulate the eddy current problem in laminated iron cores in 3D

Hollaus¹

2019

COMPEL

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Purpose -The simulation of eddy currents in laminated iron cores by the finite element method (FEM) is of great interest in the design of electrical devices. Modeling each laminate by finite elements leads to extremely large nonlinear systems of equations impossible to solve with present computer resources reasonably. The purpose of this study is to show that the multiscale finite element method (MSFEM) overcomes this difficulty.Design/methodology/approach -A new MSFEM approach for eddy currents of laminated nonlinear iron cores in three dimensions based on the magnetic vector potential is presented. How to construct the MSFEM approach in principal is shown. The MSFEM with the Biot-Savart field in the frequency domain, a higher-order approach, the time stepping method and with the harmonic balance method are introduced and studied.Findings -Various simulations demonstrate the feasibility, efficiency and versatility of the new MSFEM. Originality/value -The novel MSFEM solves true three-dimensional eddy current problems in laminated iron cores taking into account of the edge effect.

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Three-Dimensional Eddy-Current Analysis in Steel Laminations of Electrical Machines as a Contribution for Improved Iron Loss Modeling

Cited by 41 publications

References 25 publications

New Approach for Accurate Prediction of Eddy Current Losses in Laminated Material in the Presence of Skin Effect With 2-D FEA

New Approach for Accurate Prediction of Eddy Current Losses in Laminated Material in the Presence of Skin Effect With 2-D FEA

Air Gap and Edge Effect in the 2-D/1-D Method With the Magnetic Vector Potential ${A}$ Using MSFEM

A MSFEM to simulate the eddy current problem in laminated iron cores in 3D

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