Numerical Prediction of Rhombic Rotational Magnetization Patterns in a Transformer Core Package

Shilyashki, Georgi; Pfitzner, Helmut; Gerstbauer, Erich; Trenner, Gerald; Hamberger, P.; Aigner, Martin

doi:10.1109/tmag.2015.2470217

Cited by 15 publications

(7 citation statements)

References 20 publications

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“…As well, with B TD = 323 mT, the graph indicates a distinct concentration of RM at the lower part of the V‐element of S‐limb. As a conclusion, we can expect regional maxima of both losses and magnetostriction, which however are influenced also by flux distributions at other instants (in particular, in instants of zero‐flux in outer limbs; see [6, 7]).…”

Section: Modelling With Increased Spatial Resolutionmentioning

confidence: 99%

“…For readers who are not so familiar with the two terms, it should be mentioned that RM arises in T-joints and yokes round instants of zero-flux in an outer limb, i.e. R-limb or T-limb, as MACC modelled in [6,7]. On the other hand, RM in the middle S-limb arises round the instant of zero-flux in this limb.…”

Section: Macc-modellingmentioning

confidence: 99%

“…Quite recently, we developed the novel multi-directional non-linear magnetic circuit modelling (MACC)-methodology (magnetic circuit calculation) [6][7][8], as a complement to FEM in cases of high complexity, but also for improved visualisation of tendencies. The significant advantages of the methodology are (i) effective consideration of non-linear overlap characteristics in corners and T-joints, (ii) significantly lower computing time in spite of multi-directionally non-linear modelling, (iii) possibilities of simple comparisons of modified core geometry, and (iv) presentations of results that favour technical and physical interpretations.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic circuit modelling of transformer core induction – resolution and accuracy

Shilyashki

Pfützner

2017

IET Electric Power Applications

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As a tool for optimisation of transformer cores, numerical modelling is used to estimate local induction distributions. Compared to finite element method (FEM), the magnetic circuit modelling (MACC) uses much lower amounts of elements which raises questions of resolution and accuracy. This study compares MACC models of different resolutions, two flux paths (2FP) and four paths (4FP). Both are characterised by low computing times. The low resolution of 2FP offers compact information about global flux distributions, as a function of modified core geometry or material. The increased resolution of 4FP favours the assessment of regional concentration of rotational and circular magnetisation. A rough comparison with FEM illustrates that quantitative FEM studies of such mechanisms are impossible without specific post-processing. With respect to the overall accuracy of MACC, it is not determined by the number of elements but on the accuracy of geometrical assumptions and allocated permeability functions. For the transverse direction and overlap regions, the corresponding accuracy of related terms may be close to 10%, due to product tolerance or mechanical stress. Both high meshing densities and low approximation values are of academic nature. The attractiveness of modelling is not given by accuracy, but by revealing complex distributions with good approximation of instantaneous data.

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Section: Modelling With Increased Spatial Resolutionmentioning

confidence: 99%

Section: Macc-modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic circuit modelling of transformer core induction – resolution and accuracy

Shilyashki

Pfützner

2017

IET Electric Power Applications

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“…In the present paper, we report about a further enlargement to W = 100 mm, that justifies the designation of a "Giant Epstein Tester" (GET) in even better ways. To predict the effectiveness of this second step, we modeled the to-be-expected modified flux distributions by means of numerical 3D-MACC (Magnetic Anisotropic Circuit Calculation [12,13]). This studies [14] and [15] yielded encouraging results, according to the following findings: (a) The corners of an Epstein Tester are magnetized with complexity that was strongly underestimated so far.…”

Section: Introductionmentioning

confidence: 99%

Giant Epstein Tester for Magnetic Energy Loss Measurements of Non-Annealed Domain-Refined Fe–Si

Shilyashki

Pfützner²,

Giefing

et al. 2022

IEEE Trans. Magn.

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“…This is currently a topic of interest for many researchers [3  12]. In addition, the magnetising conditions in electrical machines and transformers include rotational magnetic fields and magnetic fluxes [1,13], so the power loss model should also be applicable in such cases. A widely accepted model of power loss in ferromagnetic materials is presented in [14].…”

Section: Introductionmentioning

confidence: 99%

Time domain analysis of excess loss in electrical steel

Koprivica¹,

Rosić

Chwastek

2019

Serb J Electr Eng

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The aim of this paper is to present a comprehensive approach to analyse and interpret power loss in ferromagnetic materials with particular attention devoted to excess power loss. Experimental results obtained with an Epstein frame and toroidal core made of electrical steel are presented in the paper, including quasistatic and dynamic hysteresis loops. According to the time waveforms of the measured magnetic field and magnetic flux density, an instantaneous power loss is calculated for the quasistatic and dynamic case. Moreover, the instantaneous power loss due to eddy current is calculated, as well as the instantaneous excess power loss and excess magnetic field. This excess magnetic field is compared to the excess magnetic field calculated by Bertotti's model. Analysis and discussion of the results obtained is given in the paper.

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Numerical Prediction of Rhombic Rotational Magnetization Patterns in a Transformer Core Package

Cited by 15 publications

References 20 publications

Magnetic circuit modelling of transformer core induction – resolution and accuracy

Magnetic circuit modelling of transformer core induction – resolution and accuracy

Giant Epstein Tester for Magnetic Energy Loss Measurements of Non-Annealed Domain-Refined Fe–Si

Time domain analysis of excess loss in electrical steel

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