Journal Article10.1049/PIEE.1966.0236
Effects of eddy currents in transformer windings
P.L. Dowell
- 01 Aug 1966
- Vol. 113, Iss: 8, pp 1387-1394
1.4K
TL;DR: 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.
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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
Optimizing AC and DC winding losses in ultra-compact, high-frequency, high-power transformers
Ray G. Radys,J. Hall,John G. Hayes,G. Skutt +3 more
- 14 Mar 1999
TL;DR: In this paper, nine different transformer design techniques are outlined, analyzed and compared for optimization of the primary and secondary winding resistances to minimize copper losses in a high-power, high-frequency transformer.
6
Optimization of foil conductor layout in inductive power transfer system resonators
Mohammad Etemadrezaei,Srdjan Lukic +1 more
- 13 Nov 2014
Abstract: Proper use of winding area and conductor layout in resonating coils of Inductive Power Transfer (IPT) systems is of great importance to achieve high efficient systems. In this paper a simple adaptable analytical method is investigated that can be implemented on variety of coil layout optimization problems to increase the resonator performance and the system efficiency. The method is frequency independent and overcomes the difficulties associated with the prediction of high frequency field distributions in IPT systems. In this study the procedure is applied to optimize a one-turn circular foil resonator operating at 13.56 MHz, with the Finite Element (FE) results showing of up to 30% increase in resonator quality factor and 1.73% increase in link efficiency of the IPT system.
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Two-dimensional calculation of winding losses in planar magnetic components
B. Ackermann,A. Lewalter +1 more
- 22 Oct 2001
TL;DR: In this article, a two-dimensional analytical model for planar magnetic components is presented that overcomes the shortcomings of the one-dimensional models, and its accuracy is corroborated by a comparison with results obtained from finite element calculations.
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High Quality Factor Resonators for Inductive Power Transfer Systems
Mohammad Etemadrezaei
- 05 Nov 2015
TL;DR: Etemadrezaei et al. as mentioned in this paper investigated the feasibility of high quality factor resonators at multi-MHz frequency of operation, and new ideas for magnetic link inductive coils were presented.
6
References
Effective resistance to alternating currents of multilayer windings
Edward Bennett,Sidney C. Larson +1 more
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.
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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.
95
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.
54
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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