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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
AFAIK most people buld a TC to get impressive/spectacular arcs the result will be (mostly) determined by power throughput so close-coupling, large topload etc. works best.
Tesla didn't want corona/sparks/arcs, high-voltage high-capacitance was more his thing (wireless transmission of power etc.)
Terry, your graphs clearly show the wavelength characteristics of your resonator;
the coil with topload (toroid similar to coil ... operating below 1/4 wavelength) shows a nearly linear volts/inch - lumped model reasonably accurate.
the unloaded coil clearly shows the tapering off of volts/inch near the top if you extrapolate the centre region of the slope you should get about 90 kV at the topload instead of 70 kV signs of non-lumped operation.
The resonance effect of Inductance and capacitance is more significant than the 1/4-wavelength effects so for practical high power long arc TC forget wire-length effects and operate well below 1/4 wavelength resonance. (large topload) but the effect is real and present.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
Hazmatt_(The Underdog) wrote ...
The permitivity of the conductor 'slows' the wave speed down, and if you look this up in a Belden catalog its something like .66 * speed of light, and that also varies between cables too.
so f = c/v; yea, for light and ideal cases, but not so much here.
So, if I wanted to resonant coil of my secondary with the top load to match the 1/4 wavelength frequency should I use 66-80% the speed of light for the calculation? Does anyone think this will truly affect coil performance?
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
If you design your topload to resonate the coil at the 'quarter vavelength' frequency (assuming c=speed of light in vacuum) you will certainly be in the right area (below 1/4 wavelength) due to v<c. So using the speed of light in vacuum with the length of wire to (wrongly) estimate 1/4 wavelength operation the coil will be almost a lumped equivalent/at a good frequency. Adding a second tuned circuit (the primary) causes frequency-splitting anyway so the 'operating' frequency will be neither 1/4 wavelength nor 1/2.pi.sqrt(LsCs)
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
unless your trying to make a tesla to a specfic frequency 1/4 wave is accademic. When I make a coil I just mesure it then use top load to tune it. Of more inerest is frequency splitting and tuning low.
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secondary resonance vs working frequency of the secondary coil
