Journal ArticleDOI
Computationally efficient winding loss calculation with multiple windings, arbitrary waveforms, and two-dimensional or three-dimensional field geometry
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.read more
Citations
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Proceedings ArticleDOI
Comparison and design of power electronics transformers in 25 kHz–400 kHz range
TL;DR: In this paper, the authors presented comparison and design considerations of power electronics transformers in 25 kHz-400 kHz range, where the material used is ferrite (N87) and the design is aimed at minimizing losses and volume of the component.
Journal ArticleDOI
Designing for Conductor Lay and AC Loss Variability in Multistrand Stator Windings
TL;DR: In this paper , the authors present two prediction methods for ac loss variability to be deployed at the winding design stage, one consists of an analytical approach, whilst the second constructs a 2D finite element analysis geometry that captures conductor lay characteristics.
Proceedings ArticleDOI
Analysis of magnetic materials and the design of EI-core arm inductor for MV-AFE MMC application using Multi-objective optimization
Rounak Siddaiah,Robert Cuzner +1 more
TL;DR: In this article, loss, mass, and volume were optimized using a genetic algorithm for a 2mH, 297 A(rms) MMC arm inductor with an E-I core structure.
Proceedings ArticleDOI
Exploiting cloud computing in the multi-physics design and optimisation of electromagnetic devices
Nick Simpson,Phil Mellor +1 more
TL;DR: A cloud computing service is used to complement an existing high-fidelity multi-physics power inductor design workflow by enabling multiple instances of the design analysis to be executed in parallel on virtual computers in a cloud computing environment.
Proceedings ArticleDOI
RF Transformer Model Parameters Measurement
V. Dumbrava,Linas Svilainis +1 more
TL;DR: It has been indicated that winding resistances variance of plusmn20 % is causing only 0.02 dB variation in the preamplifier noise figure if source impedance is low, while core loss resistance measurement and experimental investigation results are outlined.
References
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Journal ArticleDOI
Effects of eddy currents in transformer windings
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.
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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.