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Journal ArticleDOI

Computationally efficient winding loss calculation with multiple windings, arbitrary waveforms, and two-dimensional or three-dimensional field geometry

Charles R. Sullivan
- 01 Jan 2001 - 
- Vol. 16, Iss: 1, pp 142-150
TLDR
The squared-field-derivative method for calculating eddy-current (proximity effect) losses in round-wire or litz-wire transformer and inductor windings is derived in this paper.
Abstract
The squared-field-derivative method for calculating eddy-current (proximity-effect) losses in round-wire or litz-wire transformer and inductor windings is derived. The method is capable of analyzing losses due to two-dimensional and three-dimensional field effects in multiple windings with arbitrary waveforms in each winding. It uses a simple set of numerical magnetostatic field calculations, which require orders of magnitude less computation time than numerical eddy-current solutions, to derive a frequency-independent matrix describing the transformer or inductor. This is combined with a second, independently calculated matrix, based on derivatives of winding currents, to compute total AC loss. Experiments confirm the accuracy of the method.

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Citations
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Journal ArticleDOI

Design and implementation of PLC-based monitoring control system for induction motor

TL;DR: Tests of the induction motor system driven by inverter and controlled by PLC prove a higher accuracy in speed regulation as compared to a conventional V/f control system.
Journal ArticleDOI

New Core Loss Measurement Method for High-Frequency Magnetic Materials

TL;DR: In this paper, a new method is proposed for high-frequency core loss measurement that utilizes capacitive cancellation, which is suitable for HF and VHF core loss measurements, and it greatly reduces the sensitivity to phase discrepancy, the dominating error source in the conventional two-winding method.
Journal ArticleDOI

Frequency-dependent resistance in Litz-wire planar windings for domestic induction heating appliances

TL;DR: In this paper, the frequency-dependent resistance in Litz-wire planar windings for domestic induction heating appliances is analyzed and the magnetic field necessary to evaluate the external proximity losses is as well analytically calculated considering the complete winding and load properties.
Proceedings ArticleDOI

Simplified design method for litz wire

TL;DR: In this article, a simplified approach to choosing number and diameter of strands in litz wire is presented, where skin depth at the frequency of operation, the number of turns, the breadth of the core window, and a constant from a table provided in the paper are used.
Journal ArticleDOI

Efficiency Optimization in Digitally Controlled Flyback DC–DC Converters Over Wide Ranges of Operating Conditions

TL;DR: In this article, a lookup table-based digital controller is applied to achieve on-line efficiency optimization by programming switching frequencies and operating modes based on the efficiency optimization processes, which is verified by experimental results on a low cost 65 W flyback dc-dc prototype.
References
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Book

Static and dynamic electricity

W. R. Smythe
Journal ArticleDOI

Effects of eddy currents in transformer windings

P.L. Dowell
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.
Journal ArticleDOI

Optimal choice for number of strands in a litz-wire transformer winding

TL;DR: In this paper, the number and diameter of strands to minimize loss in a litz-wire transformer winding is determined, and a power law to model insulation thickness is combined with standard analysis of proximity effect losses to find the optimal stranding.
Journal ArticleDOI

Improved analytical modeling of conductive losses in magnetic components

TL;DR: In this paper, the authors propose an orthogonality between skin effect and proximity effect to calculate the AC resistance of round conductor windings, which gives more accurate answers than the basic one-dimensional method because the exact analytical equations for round conductors can be used.
Journal ArticleDOI

Optimizing the AC resistance of multilayer transformer windings with arbitrary current waveforms

TL;DR: In this article, the authors present a new formula for the optimum foil or layer thickness, without the need for Fourier coefficients and calculations at harmonic frequencies, which is simple, straightforward and applies to any periodic wave shape.
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