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Journal ArticleDOI

Effects of eddy currents in transformer windings

P.L. Dowell
- Vol. 113, Iss: 8, pp 1387-1394
TLDR
In this article, the effect of eddy currents on transformer windings is considered and a method is derived for calculating the variation of winding resistance and leakage inductance with frequency for transformers with single-layer, multilayer and sectionalised windings.
Abstract
The effects of eddy currents in transformer windings are considered, and a method is derived for calculating the variation of winding resistance and leakage inductance with frequency for transformers with single-layer, multilayer and sectionalised windings. The method consists in dividing the winding into portions, calculating the d.c. resistances and d.c. leakage inductances of each of these portions, and then multiplying the d.c. values by appropriate factors to obtain the corresponding a.c. values. These a.c. values are then referred to, say, the primary winding and summed to give the total winding resistance and leakage inductance of the transformer. Formulas are derived and quoted for calculating the d.c. resistances and leakage inductances of the winding portions. Theoretical expressions are derived for the variation with frequency etc. of the factors by which the d.c. values must be multiplied to obtain the corresponding a.c. values. These expressions are presented in the form of graphs, permitting the factors to be read as required.

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Citations
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Proceedings ArticleDOI

Design Principles and Optimization Considerations of a High Frequency Transformer in GaN Based 1 MHz 2.8 kW LLC Resonant Converter with over 99% Efficiency

TL;DR: In this paper, the design principles and optimization considerations for the transformer in MHz LLC converter are presented, and an accurate test-based method for core loss and copper loss estimation is proposed.
Proceedings ArticleDOI

Analysis of favored design frequency of high-frequency transformer with different power capacities

TL;DR: In this paper, the authors designed high-frequency transformers with different magnetic cores such as silicon steel laminations, amorphous alloy, and silicon-oxide alloy and revealed that different core transformers have different favored transformer design frequencies, magnetic core with more outstanding loss characteristic and lower working flux density has a higher favored transform design frequency.
Dissertation

Modèles et outils pour la conception de composants magnétiques HF dédiés à l'électronique de puissance

Zahir Belkaid
TL;DR: In this paper, the authors propose an outil generique d'aide a la conception optimale de composants magnetiques en sappuyant sur des modelisations analytiques and numeriques.
Journal ArticleDOI

Module Integral Method for the Calculation of Frequency-Dependent Leakage Inductance of High-Frequency Transformers

TL;DR: In this paper , the authors proposed to take the module integral of magnetic energy density as the periodic averaged magnetic energy, and the closed-form formula of the leakage inductance is given accordingly.
References
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Journal ArticleDOI

Effective resistance to alternating currents of multilayer windings

TL;DR: In this article, a multilayer winding carrying an alternating current, such as the windings illustrated in figures 1, 2, and 3, each layer of copper lies in the alternating magnetic field set up by the current in all the other layers.
Journal ArticleDOI

Eddy Currents in Large Slot-Wound Conductors

TL;DR: In this article, the authors discuss the more important causes of eddy currents in heavy conductors carrying alternating currents and surrounded on three sides by iron, and propose a method to identify the most important causes.
Journal ArticleDOI

Eddy-Current Losses in Cylindrical Conductors, with Special Applications to the Alternating Current Resistances of Short Coils

TL;DR: In this article, it is shown that a considerable proportion of the effective resistance of inductive coils when used at radio frequencies is caused by the eddy-currents set up in the wires of the coils by the alternating magnetic field in which they are situated, and that in extreme cases the alternating current resistance may amount to more than one hundred times the direct current resistance.
Journal ArticleDOI

Heat Losses in the Conductors of Alternating-Current Machines

TL;DR: In this article, the authors show how hyperbolic functions of complex angles may be applied to the solution of the problem of heat losses in rectangular conductors that are embedded in open slots.
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