Re: Success with Synchronous rotary gap. (fwd)

To: tesla-at-pupman-dot-com
Subject: Re: Success with Synchronous rotary gap. (fwd)
From: Tesla List <mod1-at-pupman-dot-com>
Date: Thu, 18 Dec 1997 07:47:46 -0700 (MST)
Approved: mod1-at-pupman-dot-com


---------- Forwarded message ----------
Date: Wed, 22 Oct 1997 14:48:46 -0500
From: "DR.RESONANCE" <DR.RESONANCE-at-next-wave-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Success with Synchronous rotary gap.

to: John & Peter

We also run a 1800 RPM synchro motor on one of our 6 x 24 coils with .03
MFD cap, 200 ma drive, and 20 x 5 toroid.  Results are very solid at 68
inch sparks.  Primary strike protection a must!!!

DR.RESONANCE-at-next-wave-dot-net


----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Success with Synchronous rotary gap.
> Date: Wednesday,October 22,1997 9:06 AM
> 
> 
> 
> ---------- Forwarded message ----------
> Date: Wed, 22 Oct 1997 08:09:35 -0400 (EDT)
> From: FutureT-at-aol-dot-com
> To: tesla-at-pupman-dot-com
> Subject: Re: Success with Synchronous rotary gap.
> 
> In a message dated 97-10-20 12:06:52 EDT, you write:
>    >snip>
> << the rotor had to be shifted a full 90 degrees (from what we had used
on
> > Rods coil) and the gap now runs sweetly with a very even 100 Hz buzz.
> > Also I now get no arcing across the safety gaps and even the resistors
I
> > have across the filter chokes run cooler. It seems from all this that
> > placing the gap across the trannies might be good for staionary gaps
but
> > is no good for rotaries.
> 
> Hi Peter,
> 
> I'm glad to hear you're getting good results using the sync-gap.
> They certainly seem to help for neon systems.  I place my sync-
> rotary across the tranny output (parallel with safety gap), and 
> haven't had a problem.  I don't know why yours worked better
> with the cap across the tranny.  Have you tried the parallel set-up
> again since re-phasing the gap?  
> 
> > Also the peak of the AC cycle is substantially
> > phase shifted, possibly because of resonant charging effects. I am now
> > getting regular 40" strikes, not a match for John Freau's efforts yet
> > but I think some more tuning and playing with coupling might improve on
> > that. Also I am only running 11 nF as opposed to 13 (according to the
> > formula) so resonant charging is probably not optimum. Anyway, many
> > thanks to John Freau's excellent posts on synch rotaries - I'm now a
> > great believer in the synch spark gap!
> 
> Well, thanks for those nice comments.  The AC phase shifting is 
> normal for resonant charging, and is a benefit since it causes the 
> gap to fire during a low point on the sine wave of the incoming AC. 
> This reduces the transformer losses during the time the tranny is
> shorted by the gaps.  
> 
> Synching for today and tomorrow,
> 
> John Freau
>  
> > Do many of you guys that run pole pigs use synch gaps, and if
> >so were they a big improvement?
> 
> > Cheers,
>  
> > Peter E.
>   >>