Numerical modeling of magnetic induction in standard and triple Epstein frames considering cutting and staggering of sensor strips

For magnetic energy loss measurements on electric steel sheets, the Epstein tester (ET) is applied for 100 years. However, it suffers from unsolved problems, such as inhomogeneity of flux in the corners and even more of impact of sample cutting. As a matter of fact, a detailed study of flux distribu...

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Autores principales:	Georgi Shilyashki, Helmut Pfützner, Gerald Trenner, Claes Bengtsson, Emanuel Huber
Formato:	article
Lenguaje:	EN
Publicado:	AIP Publishing LLC 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/3ce3c84bed774a5fbd39c9a20d922c87
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spelling	oai:doaj.org-article:3ce3c84bed774a5fbd39c9a20d922c872021-12-01T18:52:07ZNumerical modeling of magnetic induction in standard and triple Epstein frames considering cutting and staggering of sensor strips2158-322610.1063/5.0064106https://doaj.org/article/3ce3c84bed774a5fbd39c9a20d922c872021-11-01T00:00:00Zhttp://dx.doi.org/10.1063/5.0064106https://doaj.org/toc/2158-3226For magnetic energy loss measurements on electric steel sheets, the Epstein tester (ET) is applied for 100 years. However, it suffers from unsolved problems, such as inhomogeneity of flux in the corners and even more of impact of sample cutting. As a matter of fact, a detailed study of flux distributions—as a pre-condition for improvements—has not been performed so far. In this work, we present the results of an advanced numerical 3D-magnetic anisotropic circuit calculation modeling. It considers most relevant impacts such as anisotropy, non-linearity, method of staggering, and in particular, consequences of sample cutting. According to the literature, the latter may yield material deterioration for edge zones of high width WDET. Here, we set WDET to 2.5 mm as a “coarse-cut” convention for practice, and we compare it with perfect “fine-cut” (W = 0). As a main result, deteriorated edge zones of standard ET strips of low width W = 30 mm yield a distinct concentration of flux along inner axial strip regions as a reason for strong local flux inhomogeneity and distortion. Consistent numerical comparisons predict that higher grades of magnetic homogeneity can be expected from wider sample strips, e.g., from a “Triple ET” with W = 90 mm. As a global conclusion, the Epstein frame represents a system of extreme 3D inhomogeneity, especially in the corners. The grade of inhomogeneity reaches its maximum in instants of high permeability. It may be strongly increased through coarse cutting. On the other hand, consequences of cutting can be decreased by increasing the strip width. This would allow for loss measurements using tangential field coils arranged in the central limb regions of TET.Georgi ShilyashkiHelmut PfütznerGerald TrennerClaes BengtssonEmanuel HuberAIP Publishing LLCarticlePhysicsQC1-999ENAIP Advances, Vol 11, Iss 11, Pp 115324-115324-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Georgi Shilyashki Helmut Pfützner Gerald Trenner Claes Bengtsson Emanuel Huber Numerical modeling of magnetic induction in standard and triple Epstein frames considering cutting and staggering of sensor strips
description	For magnetic energy loss measurements on electric steel sheets, the Epstein tester (ET) is applied for 100 years. However, it suffers from unsolved problems, such as inhomogeneity of flux in the corners and even more of impact of sample cutting. As a matter of fact, a detailed study of flux distributions—as a pre-condition for improvements—has not been performed so far. In this work, we present the results of an advanced numerical 3D-magnetic anisotropic circuit calculation modeling. It considers most relevant impacts such as anisotropy, non-linearity, method of staggering, and in particular, consequences of sample cutting. According to the literature, the latter may yield material deterioration for edge zones of high width WDET. Here, we set WDET to 2.5 mm as a “coarse-cut” convention for practice, and we compare it with perfect “fine-cut” (W = 0). As a main result, deteriorated edge zones of standard ET strips of low width W = 30 mm yield a distinct concentration of flux along inner axial strip regions as a reason for strong local flux inhomogeneity and distortion. Consistent numerical comparisons predict that higher grades of magnetic homogeneity can be expected from wider sample strips, e.g., from a “Triple ET” with W = 90 mm. As a global conclusion, the Epstein frame represents a system of extreme 3D inhomogeneity, especially in the corners. The grade of inhomogeneity reaches its maximum in instants of high permeability. It may be strongly increased through coarse cutting. On the other hand, consequences of cutting can be decreased by increasing the strip width. This would allow for loss measurements using tangential field coils arranged in the central limb regions of TET.
format	article
author	Georgi Shilyashki Helmut Pfützner Gerald Trenner Claes Bengtsson Emanuel Huber
author_facet	Georgi Shilyashki Helmut Pfützner Gerald Trenner Claes Bengtsson Emanuel Huber
author_sort	Georgi Shilyashki
title	Numerical modeling of magnetic induction in standard and triple Epstein frames considering cutting and staggering of sensor strips
title_short	Numerical modeling of magnetic induction in standard and triple Epstein frames considering cutting and staggering of sensor strips
title_full	Numerical modeling of magnetic induction in standard and triple Epstein frames considering cutting and staggering of sensor strips
title_fullStr	Numerical modeling of magnetic induction in standard and triple Epstein frames considering cutting and staggering of sensor strips
title_full_unstemmed	Numerical modeling of magnetic induction in standard and triple Epstein frames considering cutting and staggering of sensor strips
title_sort	numerical modeling of magnetic induction in standard and triple epstein frames considering cutting and staggering of sensor strips
publisher	AIP Publishing LLC
publishDate	2021
url	https://doaj.org/article/3ce3c84bed774a5fbd39c9a20d922c87
work_keys_str_mv	AT georgishilyashki numericalmodelingofmagneticinductioninstandardandtripleepsteinframesconsideringcuttingandstaggeringofsensorstrips AT helmutpfutzner numericalmodelingofmagneticinductioninstandardandtripleepsteinframesconsideringcuttingandstaggeringofsensorstrips AT geraldtrenner numericalmodelingofmagneticinductioninstandardandtripleepsteinframesconsideringcuttingandstaggeringofsensorstrips AT claesbengtsson numericalmodelingofmagneticinductioninstandardandtripleepsteinframesconsideringcuttingandstaggeringofsensorstrips AT emanuelhuber numericalmodelingofmagneticinductioninstandardandtripleepsteinframesconsideringcuttingandstaggeringofsensorstrips
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Numerical modeling of magnetic induction in standard and triple Epstein frames considering cutting and staggering of sensor strips

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