A method to estimate magnetic induction from texture in non-oriented electrical steels (original) (raw)
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Journal of Magnetism and Magnetic Materials, 2011
In order to quantify the impact of crystallographic texture on the variation of magnetic flux density B(a) in non-oriented electrical steel, two sheet samples with identical chemical composition were produced in a way to achieve different textures. A correlation between the values of B(a) and an anisotropy parameter Að h ! Þ obtained from the sheet textures was established. In turn, this correlation was used to compute in-plane variations of B(a) for various single crystal orientations as well as various characteristic polycrystal texture components.
Influence of electrical steel sheet textures on their magnetization curves
Archives of Electrical Engineering, 2013
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...
Identification of magnetic properties for cutting edge of electrical steel sheets
2016 XXII International Conference on Electrical Machines (ICEM), 2016
Electrical steel sheets of motors and generators are usually shaped to the final form by punching. The punching and other cutting processes generate large plastic deformations and residual stresses. These are known to deteriorate the magnetic properties of the edge region. However, the characterization of this deterioration in the form of magnetic properties is missing. The main aim of this paper is to a method to identify the magnetic properties of the edge region based on experimental results. This approach is demonstrated by using previously presented test results for magnetic properties of rectangular strips. The width of these strips is varied, and thus, the share of the edge region to the whole can be used as a variable. Based on this variation a simple model is developed and the model parameters fitted to the experimental results. The correspondence between the calculated and experimental results is good.
IEEE Transactions on Magnetics, 2018
Non-oriented electrical steels are indispensable materials for use in electric motors as magnetic cores. It is desired that the magnetic properties of the steel sheets be optimal and uniform in all the directions in the sheet plane. Thus, knowing the magnetic properties of the steel sheets in all the directions is crucial for the design of the motors. However, the magnetic properties of non-oriented electrical steels are usually measured by the standard Epstein frame method, which normally only gives the overall magnetic properties in the rolling and transverse directions and those in other directions are usually unknown. In this paper, magnetic Barkhausen noise (MBN) analysis is utilized to characterize the local magnetic response of non-oriented electrical steel. By aligning the MBN sensor to all the directions in the sheet plane, angular magnetic response is obtained. The measured MBN is then directly compared to the texture factor evaluated in the same direction. In this way, the local magnetic response of the steel is correlated with the crystallographic texture. It was found that MBN technique was able to detect the difference in magnetic response induced by magnetocrystalline anisotropy if the effect of the residual stress can be eliminated. This would provide a potential technique for the characterization of magnetic properties of non-oriented electrical steel.
Anisotropy of Steel Sheets and Consequence for Epstein Test: I Theory
2006
ODF -Orientation Distribution Function -Theory allow the prediction of the average magnetic properties of electrical steels when crystalline symmetry of cubic bcc iron and the orthorhombic sheet symmetry are taken into account. The crystallographic texture can be related to the magnetocrystalline anisotropy by means of a very simple expression. The dependence of the variables: Magnetic Induction, coercivity, permeability and iron losses with texture is discussed. Magnetic Induction at high fields -B 25 and B 50 -can be directly scaled to magnetocrystalline anisotropy. Effects of demagnetizing field on the Magnetic Induction are commented. Permeability and power losses are not directly related to magnetocrystalline anisotropy, mainly due the existence of domain wall displacement phenomena. The domain wall structure is function of the crystalline orientation and also contributes for the anisotropy of iron losses. As consequence of the theoretical analysis, it is suggested that the traditional Epstein arrangement (50% RD-Rolling Direction plus 50% TD-Transverse Direction), be changed for 3 separate measurements in the RD, TD (i.e., 90 o ) and 45 o directions.
Journal of Magnetism and Magnetic Materials, 2000
The design of an automated system for the rapid assessment of the AC magnetostriction in electrical steel sheet under linear applied stress in the range $10 MPa is described in detail. Typical results are presented showing the e!ect of induction on the unstressed material together with plots of the harmonics of magnetostriction and speci"c total loss versus applied stress.