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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Journal ArticleDOI
Additive Manufacturing of Shaped Profile Windings for Minimal AC Loss in Electrical Machines
TL;DR: In this paper, a method of minimizing the elevated ac loss present in open slot electrical machine topologies is presented, in which individual conductor profiles are shaped according to their magnetic environment, and shown to exhibit operating mode dependent loss behavior giving them potential for efficiency improvement in applications with a dominant operating mode such as electric vehicle traction, aerospace propulsion fans and generators.
Dissertation
Integrated EMI Filters for Switch Mode Power Supplies
TL;DR: In this article, a new frequency domain model of integrated EMI filter structure is developed and verified by experimental results, and the equations to calculate the required model parameters are derived. But, the work in this paper is limited to planar electromagnetic integration, which has been a topic of research over the last few years.
Proceedings ArticleDOI
Design of integrated transformer and inductor for high frequency dual active bridge GaN Charger for PHEV
TL;DR: In this paper, the design of high power density transformer and inductor for the high frequency dual active bridge (DAB) GaN charger is discussed, and the detailed design procedure and loss analysis are discussed.
Proceedings ArticleDOI
Optimization of stranded-wire windings and comparison with litz wire on the basis of cost and loss
Xu Tang,Charles R. Sullivan +1 more
TL;DR: In this article, the authors developed a method to optimize strand-wire designs on the basis of cost and loss, and compared the results to optimized litz-wire design, using a simply calculated parameter to predict when each type of wire is preferred.
Proceedings ArticleDOI
Skin effect and proximity losses in high speed brushless permanent magnet motors
Mircea Popescu,David G. Dorrell +1 more
TL;DR: In this article, the eddy current and proximity losses in windings of different high speed brushless permanent magnet machines are investigated to give a comparative study of different operating speeds and loadings.
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.