I believe I recall that with ribbon conductors, the current flow is
concentrated at the top and bottom edges and the copper in the middle is
mostly wasted. Some time ago I performed an experiment to compare primary
losses for various primary coil geometries, including ribbon, tubing, Litz,
and various other things. The copper ribbon was unrerkable in terms of
losses. See http://www.laushaus.com/tesla/primary_resistance.htm
That aside, I can't imagine how to keep 3 spirals of tubing aligned with
each other and tapping it.
Regards, Gary Lau
MA, USA
On Mon, May 4, 2020 at 5:25 PM Terry Oxandale <toxandale@xxxxxxxxxxxxx>
wrote:
>
> I'm rebuiding my primary (and other parts), with the intent of using a
> larger diameter tube (going from 1/4" to 3/8"). It would be very convenient
> to use the same primary footprint I'm currently using, and feel I could do
> this with the larger tubing, but would like to have some margin of unused
> turns for flexibility in components.
> So my question to the group relates to primary turn stacking. I'm
> considering stacking 2 to 3 layers of 1/4" tubing (to resemble a ribbon
> versus a single, larger diameter, round conductor) into each slot of the
> structure. Looking at increase power, efficiency, etc, and think this may
> be a way to keep the radius constrained, while improving the performance.
> Thoughts and experiences of this from the group?
> Terry
>
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