Winding Turn Lengths And Areas For Magnetic Components (Part 2): Square Windows
by Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Feb 13 2026
Focus:
In the design of transformers and inductors, winding lengths and areas are required as
part of any design procedure. Winding resistance varies proportionally with winding
length, and for a given number of turns, the wire size that fits the allotted winding area
is calculated from the geometrically-derived available area. Part 1 of this article
derived winding lengths and areas for cores with round windows. This part 2 derives the
equivalent design formulas for square (or nearly square) windows such as those of EE, EI,
and EFD cores.
What you’ll learn:
- How to calculate winding length and winding area for magnetic components using cores with square or nearly square winding windows
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