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Re: The 1500t secondary myth
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- Subject: Re: The 1500t secondary myth
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Tue, 14 Dec 2004 08:11:36 -0700
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- Resent-date: Tue, 14 Dec 2004 08:15:38 -0700 (MST)
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Original poster: "Mark Broker" <mbroker@xxxxxxxxxxxxxxxx>
Steve, at this point there seems to be far too many exceptions for this to
be a rule by any means. I suspect that a vast number of people are
following the same rules of thumb and using similar design parameters with
their TCs lately, since we've determined what seems to work "really good"
but still "reasonable to build." Therefore I suspect that this Zo sweet
spot is really just a manifestation of this design similarity. I don't
mean to be harsh, but this is how I see it.
It is a good thought experiment, though :)
Mark Broker
Chief Engineer, The Geek Group
On Mon, 13 Dec 2004 08:08:38 -0700, Tesla list <tesla@xxxxxxxxxx> wrote:
Original poster: "Steve Conner" <steve.conner@xxxxxxxxxxx>
>The fact that the optimization curve seems to have a fairly broad flat peak
>keeps the faithful faithful and the skeptics skeptical.
I quite agree with this. If my (or I guess it should be "Our") deductions on
Zo are true, then there seems to be about a factor of two spread (ie from 25
to 50k) inside which you get good performance. Greg Leyh's coil that gave
25ft at 25kW (which btw is just above what John Freau's efficiency equation
predicts) has the lowest Zo I've seen of any serious performing coil.
As for the OLTCII with its 90k Zo.. Steve Ward, Jimmy H. and I did a
comparison where we all ran our coils at 100 bps and 6 joules energy. I
forget the exact figures but I think they got 41-43" and I only got 39"
which is really not much of a difference.
The one thing that could sink this theory big time (if it's true) is the
late Marc Metlicka's 3000 turn coil. This would have a Zo much above 36k
unless it had a 2" former or a topload the size of a two bedroomed house.
And also:
Marc's 3k turn coil is documented under the label mm3p in
http://www.abelian.demon.co.uk/tssp/cmod/
At the secondary resonant frequency of 38.4kHz, we have
Lee = 352mH, Cee = 44.7 pF, so Zo = 88.7k ohms.
--
Paul Nicholson