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Re: AWG vs. Diameter
Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>
But welding cable is uninsulated strands, so from a skin effect standpoint,
it's the same as a solid bar.... True it's nice and flexible.. Even 4/0 is
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
Sent: Sunday, March 17, 2002 4:03 PM
Subject: Re: AWG vs. Diameter
> Original poster: "Barton B. Anderson by way of Terry Fritz
> Hi Jim -
> How about welding cable? It's noted to be good for moving rf to ground
> considering the hgih
> quantity of thin strands. Might also be good in the primary (granted, it's
> physically large, but
> there might be smaller similar bundles).
> Tesla list wrote:
> > Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > It occurs to me that a primary wound with several parallel smaller wires
> > might actually work better than a "skin effect" equivalent
> > area tube or single wire. Consider that you were to stack (vertically)
> > half dozen AWG 10-14 wires, separated by, say 0.1 inches, and wind the
> > primary using the "ribbon". Since the wires are physically separated,
> > self inductance (which relates to skin effect) would be reduced (much as
> > "bundling" does for HV transmission lines). One could even work out
> > sort of "braiding" so that each conductor spends the same amount of time
> > the "surface" (essentially what's going on with Litz wire), or stagger
> > various spiral layers.
> > One might also be able to figure out a winding configuration that
> > the amount of loss on the inner turns: Say the cross section of the
> > primary were thick in the middle and thin at the edges... like a spiral
> > galaxy viewed edge on. In the multiconductor scheme outlined above, the
> > vertical spacing between windings would be greater in the inner turns
> > in the outer.
> > .
> > >
> > > Then, as the recent discursion about the inner turns getting hot
> > we
> > > have to consider proximity and eddy current effects. Unfortunately, I
> > don't
> > > have an answer there. I would think the thinner wire would be better,
> > I
> > > don't really know.
> > >
> > > In general, people tend to find that the thicker tubing does better
> > > thinner wire. We always attributed that to the differences in skin
> > but
> > > these new proximity and eddy current factors may matter a lot too.
> > Primary
> > > losses can really eat up a coil's performance so this is pretty
> > stuff.
> > >