Journal ArticleDOI
Loss Calculation in Laminated Steel Utilizing Antisotropic Magnetic Permeability
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TLDR
In this paper, the effect of the laminations on the flux paths is simulated by a solid block with anisotropic magnetic permeability, which is validated by a comparison of calculated flux patterns for the two cases and is applied to the prediction of stray loss in the laminated clamping rings of a power transformer by a high-order, aisotropic, finite element field computation.Abstract:
The prediction of fields and stray loss levels in laminated magnetic steel parts poses a difficult problem for the field analyst. A method is proposed by which the effect of the laminations on the flux paths is simulated by a solid block with anisotropic magnetic permeability. This method is validated by a comparison of calculated flux patterns for the two cases and is applied to the prediction of stray loss in the laminated clamping rings of a power transformer by a high-order, anisotropic, finite element field computation. An example is cited to show that the reaction field due to the eddy currents in the laminated ring need not be calculated.read more
Citations
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Proceedings ArticleDOI
Stray loss evaluation in power transformers-a review
S.V. Kulkarni,S.A. Khaparde +1 more
TL;DR: A survey of current research papers reveals the continued interest in application of advanced techniques for accurate estimation and control of stray losses in transformers as discussed by the authors, and critical comments on efficacy of all approaches and directions for pursuing further research.
Journal ArticleDOI
A technique of homogenization applied to the modelling of transformers
Abstract: It is noted that the modelling of transformers by the finite-element method makes it necessary to consider the lamination of steels, whose thicknesses are very small compared to those of the transformers. In the present work, techniques of homogenization are used to solve Maxwell's equations in stratified media such as cores. These methods are based on the substitution of a magnetically inhomogeneous structure by a simpler homogeneous equivalent one. The proposed approach leads to a macroscopic homogenized permeability tensor expressing the global properties of a laminated anisotropic material. >
Journal ArticleDOI
Anisotropy in three-phase transformer circuit model
M. Elleuch,M. Poloujadoff +1 more
TL;DR: In this paper, three simple T-joint modeling schemes accounting for the lamination anisotropy are proposed, and a good agreement is obtained between computed and measured transient currents.
Journal ArticleDOI
Comparison of the dynamic response of radial and tangential magnetic flux thrust bearings
Andrew Kenny,Alan Palazzolo +1 more
TL;DR: In this article, a prototype bearing was built with the stators and rotors made from tape wound strip and compared to the theoretical predictions and also to the performance of a radial flux thrust bearing.
Journal ArticleDOI
Fast Hybrid Approach for Calculation of Losses in Outer Packages of Transformer Core Due to Perpendicular Stray Flux
TL;DR: In this article, a hybrid approach that utilizes various 2-D models for the calculation of stray losses in the outer packages is proposed, and the advantage of the proposed methodology is in obtaining the same level of accuracy while considerably reducing the calculation time when comparing to the 3-D FEM approach.
References
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Journal ArticleDOI
Finite-Element Solution of the Eddy-Current Problem in Magnetic Structures
TL;DR: In this article, the field region is discretised by triangular Finite-elements and the solution to the field problem is obtained by minimizing the energy functional with respect to each of the vertex values of the vector potential.
Journal ArticleDOI
Vector Variational Formulation of Electromagnetic Fields in Anisotropic Media
TL;DR: In this article, a functional for the curlcurl equation in Cartesian and cylindrical coordinates is derived, which includes the treatment of loss-free anisotropic media.
Journal ArticleDOI
Computational methods for solving static field and eddy current problems via Fredholm integral equations
TL;DR: In this paper, a method based on Fredholm integral equations (equations of the second kind) was proposed to solve two-dimensional static field problems, which has numerical advantages over the mote commonly used integral equation of the first kind.
Journal ArticleDOI
Triangular finite elements for the generalized Bessel equation of orderm
A. Konrad,Peter P. Silvester +1 more
TL;DR: In this paper, a new family of triangular finite elements is described, useful for solving the axisymmetric vector Helmholtz equation, and a variety of scalar vector and Bessel equation problems.
Journal ArticleDOI
FINPLT: A Finite-Element Field-Plotting Program (Computer Program Descriptions)
Z. Csendes,P. Silvester +1 more
TL;DR: In this article, a Calcomp digital plotter for any surface for which potential values are known on an arbitrary set of points is used to draw smooth contours on the Calcomp plotter.