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Optimal choice for number of strands in a litz-wire transformer winding

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1 Author(s)
Sullivan, C.R. ; Thayer Sch. of Eng., Dartmouth Coll., Hanover, NH, USA

The number and diameter of strands to minimize loss in a litz-wire transformer winding is determined. With fine stranding, the AC resistance factor can be decreased, but DC resistance increases as a result of the space occupied by insulation. A power law to model insulation thickness is combined with standard analysis of proximity-effect losses to find the optimal stranding. Suboptimal choices under other constraints are also determined

Published in:

Power Electronics, IEEE Transactions on  (Volume:14 ,  Issue: 2 )