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
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A Novel Current-Source-Based Gate Driver With Active Voltage Balancing Control for Series-Connected GaN HEMTs
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Modeling, optimization and performance of high-Q MEMS solenoid inductors
TL;DR: In this paper, the effects of the geometrical parameters on the inductance and quality factor (Q-factor) of inductors are compared to those of solenoid inductors.
Proceedings ArticleDOI
Power losses calculations in windings of gapped magnetic components: The extended 2-D method
TL;DR: In this article, an improved 2-D equivalent (i2D) analytical calculation method to estimate conductive losses in gapped magnetic components in a wide range of frequencies is presented, which is based on the superposition of losses mechanisms (skin, gap and proximity) in the winding of the component.
Proceedings ArticleDOI
Optimisation of high frequency inductor design of series resonant converter
K.W.E. Cheng,P.D. Evans +1 more
TL;DR: In this article, an analytical solution for the eddy current losses in a high frequency power inductor is obtained in a generalized way for single and multistrand conductors, using stranded conductors on a low permeability core.
Proceedings ArticleDOI
Measurement issues related to high frequency sinusoidal excitation of magnetic coils
TL;DR: In this article, a current fed sine wave converter for the voltage excitation of magnetic coils is thoroughly analyzed and the high frequency measurement error factors are discussed, and guidelines are given for the determination of the actual hysteresis loss when there is a measuring phase error and for the temperature correction to the winding effective resistance at high frequencies.
References
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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.