Re: Stroke of brilliance?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <presence-at-churchofinformationwarfare-dot-org>

Greetings. 

I started on such a type of gap in 1994, stopped coiling  and started once 
again. What you are speaking of is essentially a SPDT switch. It is in one 
of three states. The Common terminal would be connected to one side of the 
capacitor. 

 - charging the cap from the transformer
 - no connections at all, contacts are in an in-between state
 - cap discharging into the primary winding. 

This tends to require some sort of synchronous motor to make sure that the 
capacitor is in the charge state when the line voltage is at its peak. My 
goal is to have a super filtered high voltage supply so that I can control 
the break rate to anything I want. 

I've just modified a rotary gap made by Terry Fritz for more testing. The 
caps I wish to use for filters are large, stored elsewhere and pretty 
dangerous, so nothing will happen with for some time still. 

KEN 


> Original poster: "Sean Taylor by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<taylorss-at-rose-hulman.edu> 
> 
> I just had an idea . . . it might be able to go somewhere, but is
probably just
> a lot of extra work to accomplish not a whole lot.  Anyway . . .
>  
> In TC operation, there are huge voltage peaks that can go back into the
> transformer from the primary tank oscillations.  Filters do reasonably
well at
> protecting the transformer, but don't entirely.  So - I was thinking about
> disconnecting the transformer while the spark gap was firing - yes, 120
times a
> second.   I was thinking about a rotary spark gap, and thought about changing
> the conducting areas and "blank" areas, such that when the spark gap is
firing,
> the transformer would be disconnected from the circuit.  I.E. there are two
> spinning disks on one shaft, one with bolts going through it on 2 or 4
> locations, the other with metal all the way around, except in those 2 or 4
> corresponding locations.  So most of the time, the transformer would be
> charging the tank capacitor, then it would be disconnected just before the
> electrodes lined up to fire the spark gap, then a few microseconds (~400 or
> 500) later (to allow for ringing to die out), the metal would come back
for the
> transformer to start charging the tank capacitor again.  I know it's pretty
> complicated, but it would allow for isolation of the transformer and the tank
> circuit, and probably allow a more efficient energy transfer to the primary,
> with less damping.  Any thoughts/comments/ideas?  I'm working on building a
> SRSG right now, with a fairly small motor (1/8 HP), but maybe i'll get a
bigger
> motor soon, and try it out.  This would all be easiest on a 3600 RPM
moter, at
> 120 bps, so there would be many less transitions to worry about - only 2 per
> revolution.  BTW - if this ends up working well, I've got rights to it :-)
>  
> Also, in case of incomplete discharge, would it be better to put a full wave
> rectifier on the output of the transformer so that any leftover charge
wouldn't
> fight the transformer, but aid it instead?
>  
> Also, thanks to everyone who helped with the instructions for converting a
> motor to sychronous - it worked wonderfully.  
>   
> 
> ---------------
> Sean Taylor
> The Geek Group
> G-1 #1204 
> <http://www.thegeekgroup-dot-org>www.thegeekgroup-dot-org
> Because the Geek shall inherit the Earth!
>   
> 
>   
> 
>  
>