RE: Stroke of brilliance?

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

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>

Hi Sean

It seems like the mechanical interruption of the transformer's primary would
induce a cascade of transients into the transformer. You would have to
disconnect at the right part of a cycle to avoid current surges. It sounds
like a timing problem that would be too difficult to handle by mechanical
means.

Godfrey Loudner 


> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Tuesday, January 29, 2002 1:00 AM
> To:	tesla-at-pupman-dot-com
> Subject:	Stroke of brilliance?
> 
> 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!
>  
> 
>  
> 
>