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Re: Stack of flat coils (was 8 kHz Tesla Coil)



Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Peter,

Yes, it certainly will be a challenge. There are a couple people on the list (or were at one time) who were winding quite a few different flat coils. I don't know if this has been performed in a stack for TC service. May be a first. Not necessarily a first thought, but likely a first try at a stacked flat TC.

Take care,
Bart

Tesla list wrote:

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