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Re: Tesla Coil Formula
Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx>
Hi,
I updated the Tesla coil formulas today (V3.0) with the peak primary
current formula and added CD 940 and 942 specs at the end:
http://hot-streamer.com/temp/FormulasForTeslaCoils.pdf
When thinking on Malcolm Tesla's capacitor stuff, I realized that
these would be fine additions to that doc to help give a one stop
source for the "basic" info...
I did not add the wire length formula that Jared mentions. IMHO, and
in my experiences, and in the opinions of many folks... That is just
is not a factor at all for making a good coil... Today, the
computers along with the vast studies by those like Medhurst,
Nicholson, Wheeler, and M. de Queiroz have sort of left "simple
formulas" in the dusts of history...... We used the "best of the
breed" data and formulas in our work... The moment one is proven
wrong, we just "fix it" it with a better one ;-))) Of course, that
document is "open source" so if you can make a better one, just "go
for it" :o)))) Here is the OpenOffice source file:
http://hot-streamer.com/temp/FormulasForTeslaCoils.odt
www.openoffice.org
If you can make a better one, we will come ;-))))
Cheers,
Terry
At 09:42 PM 12/12/2005, you wrote:
Hi Jared,
Frequency will change the inductance. A "change in magnetic flux"
forms an induced voltage by means of the change in current. Tesla
Coils and their frequency's are affected by changing currents and
the varying waveform is only the beginning. Because the coil is, a
coil, there are also changes in current due to the shape and
geometry of the coil itself. There are many such causes to current
opposition as you know. All of these "changes in current" cause
various values of induced voltage along the length of the coil. When
all is said and done, you will "not" measure the same inductance at
high frequency in a coil as you would with a low frequency
inductance, or even a high frequency inductance with a different
geometry (yet same length of wire). The difference in inductance is
not large, but it is often enough to cause a significant change in
frequency. When I refer to the interturn inductance, I am referring
to the fact that you will measure different values of inductance
along a coils length for the same number of turns (or same length of
wire). That is a fact.
When I am referring to interturn capacitance, I am referring to the
distribution of capacitance for each turn and how each turn adds to
the total effective capacitance. As you know, nearby objects also
affect the distributed capacitance as does the ground plane, top
load objects, etc. I didn't mean to limit C.
I know that high frequency affects are not well understood by all
the list members and I don't claim to have great knowledge of every
detail. For everyone I know, this is an ongoing study, and in my
opinion, nothing is ever written in stone. There are many ways to
look at the same thing. As long as there are no gross missing parts,
then fine. Most of us started with wire length theory's and applied
it to our coils. However, some major pieces to the puzzle were not
being accounted for, and we all knew it. The missing pieces were
known, just not accounted for. But, that was then.
Take care,
Bart
Tesla list wrote:
Original poster: Jared E Dwarshuis <jdwarshui@xxxxxxxxx>
The length of the wire has no ability to account for the inter-turn
capacitance or inter-turn inductance which is formed by currents
within the wire and currents affected by other currents in adjacent
turns. This is "ridiculously" obvious. If one must consider these
"re..............