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



Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>

Peter,

If you search the archives, you will find that years ago Richard Hull built
a magnifier coil that was only 12 inch long, had a gigantic toroid on it
(actually under it - he ran it inverted), and produced 10 foot
streamers/leaders.  So the ratio for his coil is 10:1.  But if you add in
the height of the secondary coil that drove the extra coil, the ratio may be
less than 4:1 and you might well beat his achievement.  So, for magnifiers,
does the height of the secondary "count" or not?
--Steve Y.

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, September 20, 2005 10:30 AM
Subject: Re: Stack of flat coils (was 8 kHz Tesla Coil)


> 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
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