Winding Turn Lengths And Areas For Magnetic Components (Part 1): Round Windows
by Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Jan 15 2026
Focus:
Whatever design procedure is chosen for transformers or inductors, winding lengths and
areas are in some way a part of the procedure. This article presents generalized formulas
for determining winding lengths and areas based on core shapes. The discussion on winding
areas includes formulas for achieving equal power density between primary and secondary
windings. The formulas presented in this article and a subsequent one apply to EE, EI, EC,
ER, EER, ETD, pot or any other cores with round or rectangular window shapes. This article
presents the design formulas and their derivations for round windows. (Note that a
previous article presented formulas for toroids.)
What you’ll learn:
- How to calculate winding length and winding area for magnetic components using round cores
- How to achieve equal power density between primary and secondary windings in a transformer
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