Thayer School of Engineering,
Hanover, NH 03755-8000
Paper presented at the PESC '97, Technical Program, Plenary Session 1, Monday, June 23, 1997, St. Louis MO.
abstract---The number of strands to minimize loss in a litz-wire transformer winding is determined. With fine stranding, the ac resistance factor decreases, but dc resistance increases because insulation occupies more of the window area. A power law to model insulation thickness is combined with standard analysis of proximity-effect losses.INTRODUCTION