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.read more
Citations
More filters
Proceedings ArticleDOI
Design aspects of high torque density-low speed permanent magnet motor for electric two wheeler applications
Sreeju S. Nair,Shamsuddeen Nalakath,Immadisetty Vlp Santhi,S. Jabez Dhinagar,Yateendra Deshpande,Hamid A. Toliyat +5 more
TL;DR: In this paper, the authors focus on practical aspects of designing a direct drive electric motor having extremely high torque density for a two-wheeler electric/hybrid vehicle and use strip conductors to reduce the resistance and enhance the thermal stability.
Journal ArticleDOI
Vf-constrained ηρ-pareto optimisation of medium frequency transformers in ISOP-DAB converters
TL;DR: A simple design methodology to include the Litz wire configuration in the optimisation process of medium frequency transformers with considerations of voltage and frequency constraints of semiconductors for mega-watt range input-series output-parallel (ISOP) connected dual-active bridges (DABs).
Proceedings ArticleDOI
Predicting real characteristics of boost zero-voltage switching quasi-resonant converters
TL;DR: In this article, a comparison between the ideal and the real DC-voltage conversion ratio of boost ZVS-QRCs is presented, where the real characteristics are reproduced qualitatively by computer simulation, taking into account the losses in each converter element.
Proceedings ArticleDOI
Design considerations of a high frequency power transformer
A.R.A. Razak,S. Taib +1 more
TL;DR: In this paper, some of those important parameters are briefly considered and a discussion is made throughout their geometries, core losses, winding losses, and thermal model considerations accordingly, and the authors make a proper approach, cost efficient and reliable to be implemented.
Proceedings ArticleDOI
Modified Interleave Winding of Transformer to Improve SMPS's Performance
TL;DR: In this paper, a new method of modifying interleave winding so the transformer leakage inductance and winding resistance, which are the main parameters in switch mode power supplies (SMPSs) design, is presented.
References
More filters
Journal ArticleDOI
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.
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
Effective Resistance to Alternating Currents of Multilayer Windings
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.