Eddy-Current Effects In Magnetic Design (Part 4): Dowell's Formula
by Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Jan 16 2017
Focus:
Part 4 of this series examines Dowell's equation to gain an understanding of how it illustrates
the impact of skin effect and proximity effect at different frequencies by plotting wire
resistance (FR) for different numbers of wire layers over frequency. This analysis will lead to
some conclusions about where (in the frequency range) skin effect or proximity effect
dominates, and how the physical winding of the transductor (spacing of turns and number of
layers) affects the accuracy of Dowell's formula.
What you’ll learn:
- How to interpret Dowell's formula and the corresponding plots of wire resistance for transformers and coupled inductors
- How to use Dowell's formula to understand skin effect and proximity effect in transformers and coupled inductors
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