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
Patent
Magnetic winding and method of making same
TL;DR: In this paper, an improved magnetic winding and method of calculating desired winding parameters (winding layer thickness, number of winding layers and number of turns per winding layer) for a winding in a magnetic component are presented.
Journal ArticleDOI
Homogenization Method Based on Cauer Circuit via Unit Cell Approach
Shingo Hiruma,Hajime Igarashi +1 more
TL;DR: In this article, a novel homogenization method based on the unit cell approach which provides the continued fraction and the Cauer circuit representation of the complex permeability of fine structure materials was proposed.
Dissertation
Cálculo y diseño de motores eléctricos de tracción ferroviaria. Comparativa de máquinas de inducción y de imanes permanentes.
TL;DR: In this article, the authors define a metodologia de dimensionamiento and calculo for motores mencionadas for aplicación of tranvia.
Proceedings ArticleDOI
Thermal analysis for improved packaging of 4-channel 42 V/14 V DC/DC converter
TL;DR: In this article, a 3D thermal model based on finite element modeling (FEM) using IDEAS is presented and the thermal behavior of the DC/DC converter system is simulated and analyzed.
1 kV, 10-kW SiC-Based Quadruple Active Bridge DCX Stage in a DC to Three-Phase AC Module for Medium-Voltage Grid Integration
Branko Majmunović,Satyaki Mukherjee,T. Martin,Rahul Mallik,Soham Dutta,Gab-Su Seo,Brian K. Johnson,Dragan Maksimovic +7 more
TL;DR: In this article , the design of the quadruple active bridge (QAB) is presented, and a detailed analysis of the ZVS switching waveforms is presented in terms of nonlinear device capacitances.
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.