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Re: New Fo, Cself, Ctotal Program
At 03:31 AM 1/4/99 -0700, you wrote:
>Original Poster: Terry Fritz <twf-at-verinet-dot-com>
>
>Hi All,
>
> We have often wanted to know the resonant frequency, self capacitance, and
>total capacitance of our secondary coils before they are built.
> Wheeler's formula gives us the secondary inductance
>The Medhurst equation...is fairly accurate.
> However, once you put a terminal on the top of the secondary, things get
bad.
...
>People have done experiments but the experimental set up never seems to
match our >systems well and the results may not be very good.
What formula is typicaly used to calculate resonant frequency?
F=1/2 PI L C ? or F={[(1/LC)-(R/2L)^2]^.5}/2 PI ?
The former is the typical approximation while the latter requires knowledge
of load resistance. It's significant with Low-Q's, such as a Tesla secondary
which I've heard can be as low as 10 when arcing.
Resistive loading increases the frequency. A growing streamer increases
capacitance, tending to decrease the frequency. But all this talk of
frequency can be misleading, as the action happens in the time domain.
Maybe when arc generation dynamics are understood (by me, anyways), and
resonant energy transfer is understood (I believe it is), and if a
technology for dynamic control is applied (I won't open that large can of
worms), it may be found that by dynamic (time changing) control, large arcs
can be generated with out a large capacitive top load, which is a fine
energy store for a growing arc, BUT a significant limiter of possible peak
(voltage) potential of the secondary.
I feel the urge to write comming on...