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On 12/18/14, 10:22 PM, Carl wrote:
Hey--
There's also an effect similar to the skin effect that pushes the
current toward the edges of the strip. I don't know how to calculate
it, but as a guess I would make the strip 1.5x or 1.7x wider that a
calculation with an even current distribution would give. The best idea
is to use Litz wire, but that would put you in the rarefied atmosphere
of the truly hard core.
---
Google "skin depth calculator".. I use the one at Microwaves101.com
But, 8 mils (0.008") for copper at 100 kHz. Skin depth goes down as the
square root of frequency, so at 300kHz it's 0.0046" (.008/sqrt(3))
I think Litz wire wouldn't be very cost effective. You could probably
get a lower AC resistance, cheaper, by just going to a flat ribbon
rather than a round wire or tube.