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series RSG gaps (fwd)
---------- Forwarded message ----------
Date: Fri, 13 Feb 1998 13:47:44 -0700
From: Bill Lemieux <gomez-at-netherworld-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: series RSG gaps
NOTE: email replies preferred!
Savants and Sages,
I think this has been addressed before. If so, I missed the detailed
discussion. I am designing a new synchronous series-rotary gap intended
to be "bulletproof" in terms of wear and tear, safety and performance.
My original intent was to try sixteen gaps in series (ie, eight pole
rotor, eight poles on each stator, all in series), but I'm unsure if
my supply voltage will jump that many arcs, even with very close gap
spacing. (this machine is being built such that it should be capable of
safely maintaining very close gap spacing)
My desire for many series gaps was to reduce the average power
dissipated in each gap and thus reduce electrode erosion. Electrode
replacement on this device will be non-trivial, as they are being
pressed into place with an interference fit for safety.
Any thoughts? Has anyone every used more than eight gaps in series on a
rotary series gap? I know that many folks here have used 4 - 8 gaps in
series on RSG's on their larger machines.
System info:
(this is what I'd class as a medium-large coil, running at ~10kVA,
generating strikes of 12+ ft)
supply is ~15KV under full "charging" load, and we are avoiding
resonant rise charging for the moment. Gap is across transformer.
tranny is custom-built, 12kVA, 15kV -at- 800mA, 220v pri., internally
current limited, built-in toroidal RF choke, single bushing.
cap is 0.1uF
electrodes are 0.5" W/Cu "alloy".
rotor speed is (will be) 3600 RPM.
electrode circle is about 10", thus the surface or "passing" speed is
about 160 feet/sec.
Spacing can probably be maintained safely down to .005" - .01", but I
wouldn't care to try it much smaller than that, given the cost of
replacing the parts if it crashes.
-Gomez
NOTE: email replies preferred!
--
........................................................................
. personal email: gomez-at-netherworld-dot-com .
. personal web page: http://www-dot-netherworld-dot-com/~gomez .
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