Eddy-Current Effects In Magnetic Design (Part 3): Conductor Cross-Sectional Geometry
by Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Oct 17 2016
Focus:
In transformer or coupled-inductor (i.e. transductor) design, we need expressions that account
for the combined skin and proximity effects. Such formulas have already been developed through
field derivations, but those formulas are not entirely adequate for transductor winding
designs. The field solution to the eddy-current problem was worked out by P. J. Dowell and
published in 1966. Dowell solved the field problem for two planar parallel conductors, such as
two parallel metal bars. For any other conductor shape, the field problem must either be solved
or else the Dowell formula for parallel bars is adapted to them. This part 3 article addresses
the adaptation from parallel bars to foil, square wire and round wire conductors. Interestingly
enough, there is no general agreement in the magnetics industry or academia on exactly how to
do this.
What you’ll learn:
- How to convert Dowell’s formula for the resistance of parallel planar [bar shaped] conductors for use with square or round wire conductors
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