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Re: [TCML] Finished: New 600bps Rotary, Power Controller + Variac for DC resonant charging TC

Hi charles,
that's the reason why I decided to use only 6 electrodes + a large disc + high revolutions + 4 instead of only 2 gaps (the rotary electrodes are firing on each side). What speed is your gap running? You have to keep the mechanical dwell time as low as possible, so that the current through the charging reactor has not enough time to rise to dangerous levels during the short circuit, when the gap is closed. But this get's more critical in large systems, with very low inductance reactors. 

Regards,
Stefan
----- Original Message ----- From: "charles rakes" <crakes29@xxxxxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, October 20, 2014 5:44 AM
Subject: Re: [TCML] Finished: New 600bps Rotary, Power Controller + Variac for DC resonant charging TC 



Very nice construction.  Much neater than my single phase dc rotary gaps.
I'm running just shy of 20,000 VDC input and had to increase my rotary
fixed contacts in a 12 inch diameter circle. Smaller than that caused the 
charging arc to follow over to the discharge electrodes.  I have 8 fixed
electrodes and two rotating electrodes giving two complete charge/discharge 
cycles per RPM.  All of my electrodes are made of brass.   I have a lot of
brass material and replacement is easy.  I'm getting over 5 ft arcs with
less than 200 VAC into my system.   I'll need to move the coil outdoors to
run at full output. As far as I'm concerned DC coiling works the best for 
me.   I also have a small DC testing setup with a similar 8 contact RSG
that I use for check a number of secondary coils and other DC experiments.


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