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1

Influence of the mechanical fatigue progress on the magnetic properties of electrical steel sheets

Karthaus J., Steentjes S., Gröbel D., Andreas K., Merklein M., Hameyer K.

Archives of Electrical Engineering

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2017

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Vol. 66, nr 2

351--360

EN

The purpose of this paper is to study the variation of the magnetic properties of non-oriented electrical steel sheets with the fatigue state during cyclic mechanical loading. The obtained results are central to the design of variable drives such as traction drives in electric vehicles in which varying mechanical loads, e.g. in the rotor core (centrifugal forces), alter the magnetic properties. Specimens of non-oriented electrical steel are subject to a cyclically varying mechanical tensile stress with different stress amplitudes and number of cycles. The specimens are characterised magnetically at different fatigue states for different magnetic flux densities and magnetising frequencies. The measurements show a variation in magnetic properties depending on the number of cycles and stress magnitude which can be explained by changes in the material structure due to a beginning mechanical fatigue process. The studied effect is critical for the estimation of the impact of mechanical material fatigue on the operational behaviour of electrical machines. Particularly in electrical machines with a higher speed where the rotor is stressed by high centrifugal forces, material fatigue occurs and can lead to deterioration of the rotor’s stack lamination.

2

Influence of electrical steel sheet textures on their magnetization curves

Mazgaj W., Warzecha A.

Archives of Electrical Engineering

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2013

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Vol. 62, nr 3

425--437

EN

The Goss texture is a characteristic feature of grain-oriented transformer steel sheets. Generator sheets, which are produced as non-oriented steel sheets, should have isotropic features. However, measurement results of generator sheets, confirmed by crystallographic studies, indicate that these sheets are characterized by certain, quite significant anisotropy. The first purpose of this paper is to present the influence of textures of generator and transformer steel sheets on their magnetization characteristics. The second aim is to propose a method which takes into account the sheet textures in the calculations of magnetization curves. In calculations of magnetization processes in electrical steel sheets, models in which the plane of a sheet sample is divided into an assumed number of specified directions are used. To each direction a certain hysteresis loop, the so-called direction hysteresis, is assigned. The parameters of these direction hystereses depend, among other things, on the texture type in these steel sheets. This paper discusses the method which calculates the parameters of these direction hystereses taking into account the given sheet texture. The proposed method gives a possibility of determining the magnetization characteristics for any direction of the field intensity changes.

3

Przydatność modeli eksperymentalnych obliczania strat w blachach elektrotechnicznych

Pluta W., Rygał R., Soiński M.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 4a

52-55

PL

W pracy przedstawiono analizę kilku metod obliczania strat całkowitych w taśmach elektrotechnicznych o ziarnie zorientowanym M130-27S oraz niezorientowanych gatunku M330-35A. Wykonane porównanie uzupełniono o rozważania dotyczące anizotropii, któremu to zjawisku nie przypisuje się jednak dostatecznego znaczenia w istniejących metodach modelowania. Dla celów projektowania maszyn elektrycznych wirujących wymagalnymi stają się prace uwzględniające wpływ zjawiska przemagnesowania obrotowego taśm elektrotechnicznych.

EN

In the paper is presented comparison of few methods of total magnetic loss calculation in grain oriented (M130-27S) and non oriented (M330-35A) electrical steel sheets. The comparison was additionally completed with taking into account the anisotropy to which in not paid proper attention in electrical sheets. It is also worth to note that in the case of design of electrical machines, the available modeling methods require the analysis of loss components resulting from rotating magnetic fields in electrical sheets, as well.

4

Properties of loss components in electrical steel with Goss texture

Pluta W.

Przegląd Elektrotechniczny

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2009

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R. 85, nr 1

25-27

EN

Samples of non-oriented and grain-oriented electrical steel have been tested in an Epstein frame at three frequencies. The specific total loss was separated into hysteresis, eddy current and excess components. All three of these components are dependent on degree of texture as well as on flux density level. The aim of this paper is to provide a contribution to the understanding of magnetic loss and some properties of its components in soft magnetic materials.

PL

Aparatem Epsteina określono właściwości magnetyczne blach elektrotechnicznych o ziarnie niezorientowanym i zorientowanym dla trzech częstotliwości, a następnie dokonano rozdziału strat na składowe histerezową, wiroprądową i dodatkową. Składowe strat są zależne od stopnia steksturowania jak również od zakresu wartości indukcji magnetycznej. Celem artykułu jest przedstawienie zasadności analizy strat w materiałach magnetycznie miękkich.

5

Anisotropy influence on loss components in electrical steel sheets

Pluta W.

Przegląd Elektrotechniczny

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2007

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R. 83, nr 4

38-41

PL

Aparatem Epsteina określono właściwości magnetyczne blach elektrotechnicznych o ziarnie niezorientowanym i zorientowanym dla trzech częstotliwości, a następnie dokonano rozdziału strat na składowe histerezową, wiroprądową i dodatkową. Obie składowe, histerezowa i strat dodatkowych są zależne od anizotropii magnetokrystalicznej. Przedstawiono zależność pomiędzy kątem histerezy, współczynnikiem strat dodatkowych i anizotropią magnetokrystaliczną.

EN

Non and grain oriented electrical steel have been tested in an Epstein frame at three frequencies and the power loss was separated into hysteresis, eddy current and excess loss components. Both, hysteresis and additional loss components are dependent on magnetocrystaline anisotropy. The relationship between the hysteresis angle, additional loss factor and the magnetocrystaline anisotropy also is shown.