Journal ArticleDOI
A finite element method to compute three-dimensional magnetic field distribution in transformer cores
TLDR
In this article, a numerical method is proposed to compute three-dimensional magnetic field distributions in nonlinear nonhomogeneous media, neglecting hysteresis and eddy currents.Abstract:
A numerical method is proposed to compute three-dimensional magnetic field distributions in nonlinear nonhomogeneous media, neglecting hysteresis and eddy currents. The magnetic field is derived from a scalar potential satisfying a nonlinear elliptic equation, which is solved by a convergent iterative method. A finite element program has been developed to compute the magnetic field distribution in transformer cores. Some numerical results for a butt and lap corner configuration are discussed.read more
Citations
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Journal ArticleDOI
A model of anisotropic grain-oriented steel
A. Di Napoli,R. Paggi +1 more
TL;DR: In this paper, the magnetic flux distribution in the grain-oriented steel core transformer is investigated with the finite element method and a mathematical model (Model II) is obtained for the reluctivity tensor.
Journal ArticleDOI
A Jiles-Atherton and fixed-point combined technique for time periodic magnetic field problems with hysteresis
TL;DR: In this article, a finite element solution of periodic steady state magnetic field problems in soft materials with scalar hysteresis is presented, where the fixed point technique can efficiently deal with non-single valued material characteristics under periodic operating conditions.
Journal ArticleDOI
New transformer model including joint air gaps and lamination anisotropy
M. Elleuch,M. Poloujadoff +1 more
TL;DR: In this paper, a three phase transformer model is presented, taking into account air gaps, saturation, core losses, and lamination anisotropy, and the flux distribution in a straight overlap joint has been investigated using a lumped circuit model.
Journal ArticleDOI
Field and circuit approaches for diffusion phenomena in magnetic cores
Oriano Bottauscio,Alessandra Manzin,Aldo Canova,M. Chiampi,Giambattista Gruosso,Maurizio Repetto +5 more
TL;DR: In this article, two approaches for nonlinear dynamic modeling of voltage-driven magnetic circuits are presented, one based on a finite element method and the other based on the lumped parameter approach.
Magnetodynamic vector hysteresis models for steel laminations of rotating electrical machines
TL;DR: In this article, Dlala et al. presented a magnetodynamic vector hysteresis model that produces accurate predictions of the magnetization curves, and hence iron losses, under alternating and rotating flux excitations.
References
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Journal ArticleDOI
Three-dimensional magnetic field determination using a scalar potential--A finite element solution
TL;DR: In this article, a novel procedure of formulating the three-dimensional magnetic field problem in heterogeneous materials in terms of the unknown scalar potential φ and a known analytical solution for a vector potential which is caused by the specified current densities in a homogeneous domain is presented.
Journal ArticleDOI
Flux distribution and power loss in the mitered overlap joint in power transformer cores
TL;DR: In this article, the authors measured the power loss in two ways for a range of overlaps: first, using the localized power loss technique, and then by measuring the total power loss with a precision wattmeter.
Journal ArticleDOI
The spatial variation of localized power loss in two practical transformer T-joints
Anthony John Moses,B. Thomas +1 more
TL;DR: In this paper, the power loss and flux distribution in two commercial T-joints have been compared, and the results showed that the 45° offset joint was 10% more efficient than the conventional 45°-90° joint at a flux density of 1.6 T; the mean loss of both joints was more than 25% higher than the loss in the yokes and limbs.
Journal ArticleDOI
Power loss and flux density distributions in the T-joint of a three phase transformer core
A.J. Moses,B. Thomas,J. Thompson +2 more
TL;DR: In this paper, a three phase transformer test facility has been used for measuring the localized power loss and flux distribution within the core of a core with simple double overlap joints, and the flux density distribution was measured by an array of search coils wound on individual laminations.
Journal ArticleDOI
Comparison of the localized power loss and flux distribution in the butt and lap and mitred overlap corner configurations
TL;DR: The most common type of joint in large single-phase transformer cores is the 45° mitred overlap, but also important in smaller core is the simpler butt and lap joint as mentioned in this paper.