Original poster: "Peter Terren" <pterren@xxxxxxxxxxxx>
I have all the bits to make up a TC based on a stack of flat coils.
I have the spacers, wire and acrylic base and oil tank to put it
in. I am aiming for 600 turns of heavy PVC coated wire in a one
foot high coil. I am aiming for a record coil to spark length ratio
with a target of 4 foot sparks to give a 4:1 ratio. The winding of
heavy gauge wire in a single spiral will be a challenge.
http://tesladownunder.com/Tesla_coils_intro.htm#Multilayer%20Tesla%20coil
Peter
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, September 20, 2005 2:52 AM
Subject: Re: 8 kHz Tesla Coil
Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
Hi Boris,
Multilayer will have breakdown limitations which I know you've
already considered. Did you have some thoughts about this as far as
a specific winding technique? It will still have the same RF loss
issues, regardless.
I think it was Antonio who mentioned a stack of flat coils. This
would be interesting to look at. The distance between each flat
coil would need to be separated enough to prevent coil to coil
breakdown. Winding direction, id to od connection, all would be
important to keep the stacks as compressed as possible to take
advantage of the proximity (that would be the hard part).
I wound one flat coil a couple years ago. Pretty easy to do. I used
a lazy Susan turn table, layed down double sided carpet tape onto a
sheet of plexy, and started winding (round and round and round).
The tape helped keep the wire in place as the work went on. It
would be very interesting to wind several identical flat coils
maybe only a 10" o.d. to keep the volts between stacks somewhat
low. Flat coils do have a tendency to arc along the surface when over stressed.
Using a 1x10 (id & od) with #24 is 400 turns at near 200 kHz 20"
above a ground plane. Putting an identical coil 1" above this coil
results in a drop in freq to about 130 kHz. The merit as I see it
is simply less wire, but there are breakdown obstacles to overcome
not only between stacks but also at the outer and inner edges.
I don't know, just contemplating the possibility. Maybe someone's
software out there could look this. But again, the RF losses are
independent of coil winding approaches, so no benefit in that
respect. And if nothing else, I guess it could be converted to an
induction coil with a little work.
It's hard to beat simplicity (single layer helical).
Take care,
Bart