Building a sync RSG... But how? (fwd)
---------- Forwarded message ----------
Date: Tue, 12 Oct 1999 22:24:52 +0300
From: "Antti [iso-8859-1] Koskipää" <antti.koskipaa-at-nic.fi>
Subject: Building a sync RSG... But how?
After searching the entire tesla ring, I found no information on how to
exactly calculate and build a synchronous rotary spark gap.
Here's the current coil specs:
8kV 100mA (NST) into 20nF and 8 turns, 1000 turn 4" diameter secondary
with 0.4mm copper wire, multigap spark gap w/copper pipes (7 gaps), 28"
arcs from the toroid.
And here are the questions:
How do I calculate a motor's rpm if I know the number of "magnetic
poles" in it?
(motor will be a salient-pole type, 3-phase, 50hz)
How do I calculate the number of electrodes and their spacing?
I want 100bps (-at-50hz). I haven't figured this out on my own. If I put
the spacing a little bit wrong, wouldn't the sparking drift out of sync
after running for a while and then again into sync etc...?
I found some 3-phase, 90W 660/670rpm motors from the local scrap yard,
use these? (with a phasing capacitor of course, I want to use a 1-phase
Would this improve the coil's performance? everything else has already
Or should I just go for a fast-rotating, non-sync rsg? I want to build
anyway so I could use it in future coils...
Thanks in advance,