RE: NEW COIL FIRING!
Subject: RE: NEW COIL FIRING!
From: richard.quick-at-slug-dot-org (Richard Quick)
Date: Tue, 31 Jan 1995 23:30:00 GMT
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> From mark.graalman-at-mediccom.norden1-dot-com
> > From: richard.quick-at-slug-dot-org (Richard Quick)
> > > From: bhaley-at-shore-dot-net (Brendan Haley)
> > BH> The question is: the winding stops about 4 inches from the
> > BH> top of the pipe. There is one sweeping wind from the end of
> > BH> the tight winding up to the top, where the discharge
> > BH> terminal is. Does this spread out the capacitance along
> > BH> this long wind, and away from the terminal. I have noticed
> > BH> that there is corona all along this wind, and the sparks
> > BH> seem to get stronger near the tight winding.
> > BH> I am planning to cut off the rest of the pipe anyway, but I
> > BH> am curious as to whether my intuition is correct (allthough
> > BH> I doubt it)... Any kind responses are appreciated. Thank you
> > BH> -Brendan
>RQ >The only problems you are having is that: your discharger is
>RQ >mounted too high up off the top of the secondary winding; your
>RQ >discharger is too small in diameter; or both.
>RQ >Cut the coil form down to 1 inch above the winding, and properly
>RQ >cap the coil. I just use scrap pieces of squarely cut PVC pipe as
>RQ >insulating spacers to change and adjust the height of the
> BH> Not to harp on the subject, but why does the distance between the
> BH> winding and the discharger matter: i.e. what physical phenomenon is
> BH> occurring. Is it extra resistance from the wire, or capacitance?
> BH> Normally I would envision the points as electrically equivalent,
> BH> regardless of this length.
> BH> I know I am wrong in assumming this, and I am curious as to why.
> BH> Also, while I'm asking, what purpose does the discharger serve? A
> BH> coil still produces the wireless power transmission without the
> BH> capacitive hat.
MG> Each ajacent turn in a coil makes a small capacitance, the top turn on
MG> the secondary has no ajacent turn above it, so it will allow a corona
MG> to occur if there is no terminal, or if the terminal is too high. The
MG> terminal if it is large enough in capacitance, will become "dominate"
MG> in comparision to the distributed/stray capacitity found in the coil
MG> itself, thus it in effect draws the energy out of the coil, and
MG> re-distributes the current in the secondary. The terminal also stores
MG> the energy in between "bursts" and since the energy is stored
MG> "outside" of the coil capacitance, it increases the power handling
MG> capability of the secondary coil.
EXCELLENT ANSWER! Thanks for the input Mark. This is something that was
a little muddled in my mind, but your clarity here cut right through
the fog. I knew how it worked, I knew how to make it work better, but
you gave the best answer I have ever heard as to "WHY" it works.
... If all else fails... Throw another megavolt across it!
___ Blue Wave/QWK v2.12