Title :
Optimal choice for number of strands in a litz-wire transformer winding
Author :
Sullivan, Charles R.
Author_Institution :
Thayer Sch. of Eng., Dartmouth Coll., Hanover, NH, USA
fDate :
3/1/1999 12:00:00 AM
Abstract :
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
Keywords :
eddy current losses; electric resistance; skin effect; transformer windings; wires (electric); AC resistance; DC resistance; eddy current losses; insulation thickness modeling; litz-wire transformer winding; loss minimisation; magnet wire; optimal strand diameter; optimal strand number; power electronics; power law; power transformers; proximity-effect losses; skin effect; Cable insulation; Conductors; Core loss; Design optimization; Magnetics; Power transformer insulation; Power transformers; Temperature; Windings; Wire;
Journal_Title :
Power Electronics, IEEE Transactions on
