Computationally efficient winding loss calculation with multiplewindings, arbitrary waveforms, and two-dimensional or three-dimensionalfield geometry |
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Authors: | Sullivan CR |
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Affiliation: | Thayer Sch. of Eng., Dartmouth Coll., Hanover, NH ; |
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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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