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.
read more
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.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Medium frequency high power transformers, state of art and challenges
E. Agheb,Hans Kristian Hoidalen +1 more
- 01 Nov 2012
TL;DR: In this paper, a review on the status of art, trends and challenges of medium frequency high power transformers is presented in detail, and several potential future works are proposed and addressed completely.
36
Microfabrication process for high-frequency power-conversion transformers
Charles R. Sullivan,Seth R. Sanders +1 more
- 18 Jun 1995
TL;DR: In this paper, a process for microfabrication of transformers for high-frequency power conversion applications is described, which uses multilayer films of NiFe/SiO/sub 2/ magnetic material and copper coils deposited on a silicon substrate.
36
Loss comparison in the design of high frequency inductors and transformers
J.D. Lavers,V. Bolborici +1 more
- 18 May 1999
TL;DR: In this paper, three design methods, widely used for high frequency inductors and transformers, are critically compared using, as a basis, the example of low profile, small footprint, low loss 500 kHz devices.
36
Improved loss determination for planar integrated power passive modules
Johan Strydom,J.D. van Wyk +1 more
- 07 Aug 2002
TL;DR: In this article, a comprehensive loss model for the planar integrated L-L-C-T is presented and verified using experimental case studies, taking non-sinusoidal core excitation losses, both skin- and proximity-effect conductor losses and dielectric losses into account.
36
Influence of parallel wire placement on the AC copper losses in electrical machines
David Bauer,Paul Mamuschkin,Hans-Christian Reuss,Eugen Nolle +3 more
- 10 May 2015
TL;DR: In this paper, a permanent magnet machine used for electric and hybrid cars showing 6 pole pairs, a maximum power of 80kW and a maximum speed of 12000 rpm is used for this analysis.
35
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.
112
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.
27