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An analytical model based on one dimensional 1-D Dowell's equation for computing ac-to-dc winding resistance ratio FR of litz wire is presented. The model takes into account proximity effect within the bundle and between bundle layers as well as the skin effect. Model describes three frequency ranges: low-, medium-, and high-frequency range. In each of ranges, the behavior of the ac-to-dc winding...
While the use of foil windings in transformers and air core inductors is not uncommon, their use in electric machines is just emerging. Although prototype realizations have been reported in the literature, a definitive analysis of their thermal performance is necessary to evaluate their potential for broad applications. This paper is devoted to presenting a comprehensive model for evaluating their...
The technique for analytical determination of ferromagnetic conductor skin layer characteristics in a sinusoidal electromagnetic field under conditions of the conductor heating and non-linear magnetic properties has been developed. The proposed approach can be used for induction-heating installation engineering design. According to this, a conductor non-linear magnetization curve is firstly replaced...
Superlattice structures consisting of non-ferromagnetic/ferromagnetic metals have been used to create high performance conductors for radio frequency (RF) transmission lines and low loss vias in CMOS and through silicon/glass via (TSV/TGV) structures, whose ohmic resistance and RC delays have been greatly reduced. Two permalloys of Ni80Fe20 and FeCo are studied as the ferromagnetic materials with...
The calculation of the electrical parameters of overhead lines and cables is crucial for simulations of transient phenomena. Parameters in the frequency domain for frequencies higher than the power frequency are substantially different to parameters at power frequency. In particular, SKIN- and PROXIMITY-effects are of great importance. The partial subconductor method is accepted and effective to describe...
For recent VLSI circuits, the clock frequency and integration density have continuously increased. Thus, accurate estimate of the per-unit-length resistance and inductance of interconnect has become important for maintaining the signal integrity [1]. In order to design for the transmission lines successfully, it is necessary that correctness of the selected formulas or numerical methods can take into...
In this paper a new method is presented for calculation of frequency-dependent impedance in a straight. The mentioned method is compared with two other approaches which are conventionally used in high frequencies impedance calculation. The new method is relatively fast and simple and its results are admissibly accurate and conforms the conventional methods.
The orientation used to wind a transformer is important in power transformers carrying high-frequency currents. Analysis of copper losses due to skin and proximity effects is performed in order to choose the best configuration of the turns inside the winding area when conductors are carrying non-sinusoidal current. Initially results are a direct application of Dowell's formula for the fundamental...
This paper describes an accurate method to discretize the Dirichlet-to-Neumann boundary operator for a convex polygonal conductor. The technique is based on an expansion of the boundary value of the current density. Because the corresponding expansion functions exhibit the exact current behavior inside the conductor, they ensure a very good accuracy up to skin effect frequencies. In combination with...
This paper discusses the loss in the transformer and the inductor in applications of the DC/DC converters. The analysis of this loss due to eddy currents in windings conductor of these transformers and inductors is made. This eddy current loss is caused particularly by two effects: skin effect and proximity effect, which are also part of this text. The design optimization of these windings to minimize...
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