期刊
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
卷 45, 期 2, 页码 854-860出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2009.2013594
关键词
Complex permeability; eddy currents; inductors; litz wire; magnetic devices; power conversion; power transformers; proximity effect; skin effect
Previous methods for calculating power loss in litz-wire windings usually assume very fine strands such that the diameter of strands is much smaller than skin depth. In this paper, we present a method for calculating proximity-effect loss in litz-wire windings, using an equivalent complex permeability model of the winding. We first obtain a permeability model for litz-wire bundles, then use homogenization techniques to find the effective permeability of a winding. Permeability models are provided for bundles consisting of either rectangularly packed or hexagonally packed strands. The permeability model enables high-accuracy proximity-effect loss analysis and field analysis for litz-wire windings at high frequencies. It can also be used to find the leakage inductances in magnetic components.
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