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
AC Winding Losses in Automotive Traction E-Machines: A New Hybrid Calculation Method
TL;DR: A comparison of the obtained results by the two methods is carried out, in order to prove the proposed methodology effectiveness and to evaluate the winding losses impact on the overall design performance.
Journal ArticleDOI
A Fast Method to Optimize Efficiency and Stray Magnetic Field for Inductive-Power-Transfer Coils Using Lumped-Loops Model
Ming Lu,Khai D. T. Ngo +1 more
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Simplified Analytical Model and Investigation of Open-Circuit AC Winding Loss of Permanent-Magnet Machines
Lijian Wu,Zi-Qiang Zhu +1 more
TL;DR: A simplified analytical model based on one slot per pole for predicting the open-circuit AC winding loss of surface-mounted permanent-magnet machines accounting for the influence of tooth-tips but neglecting the redistribution effect of eddy currents is presented.
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Electrofluidic pretreatment for enhancing essential oil extraction from citrus fruit peel waste
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Journal ArticleDOI
Time-Domain Homogenization of Windings in 2-D Finite Element Models
TL;DR: In this paper, an extension of the frequency-domain homogenization of multiturn windings in finite element (FE) models is proposed for axisymmetric 103-turn inductors.
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.
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.