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Re: [TCML] Re: Spark Gap Resistance
Thanks for the response Bart
What led me to say that .65 ohms seems low is that comparing my modeling
with Richie Burnett's Real Tesla coil wave forms seems to match best with
about 2-3 ohms total primary resistance. This is based on my small study
coil. Granted that visually comparing RF burst ring down rate is not very
precise, but .65 ohms just doesn't fit. It is possible that the higher
currents of
Greg's coil make a hotter plasma in the spark gap and hotter plasmas
tend to be of lower resistance. Suffice it to say that my spark gap heats
up faster than any other part of my primary circuit which would imply the
greatest losses.
----- Original Message -----
From: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Saturday, December 08, 2007 1:57 PM
Subject: Re: [TCML] Re: Spark Gap Resistance
Hi Dave,
0.65 ohms is not low, it's very high! Look at I^2R across all four gaps
for 2.9 MW per gap! Bert attributed the possible high values to the
impedances of the gap between all 4 series connections which is really the
only other place to attribute such a large loss. I have my doubts on the
accuracy of the 0.65 ohm value because it just seems too high even with
the impedances of the rotary between the 4 gaps (because I expect Greg
would have made those areas very robust).
I personally would expect total gap resistance in the range of 0.1 to 0.2
ohms for the 4 total gaps.
The 0.65 ohms value might be accurate, but if it is, then losses are
likely in the impedances of the rotary and they are very significant.
Take care,
Bart
David N. Van Doren wrote:
Greg
.65 ohms for a spark gap seems very low. But then again that is an
unusualy large coil, with a
very large cap and charge voltage. I don't think this is very
representitive of the average coil tho.
Such a low gap impedence must be a result of such high currents and large
amouts of ohmic heating of the plasma in the gap reducing it's
resistance.
You also reference silicon switches used in your 90L10K prototype coil,
having an effective impedance of 5milli ohms. Just what were these
switches?
Thanks
Dave _______________________________________________
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