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Re: Rotary Sync Gap

to: Terry, Malcolm

Great post Terry.  I have been using these small synchro motors for years
and due to their low cost I can't imagine why anyone but a high school coil
builder on a severe budget would consider a stationary gap.  The 1800 RPM
snychro rotorary provides very high peak currents in the discharge path. 
When you take some 4-6 sec at f1.4 time lapse shots with your 35 mm camera
you will not some very "bushy" forking in the discharge -- much thicker
than the standard fixed gap discharge.  This is not visible to the human
eye but does show up well in the time photos.  Have fun.

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


----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Rotary Sync Gap
> Date: Thursday, September 24, 1998 5:19 PM
> 
> Original Poster: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz> 
> 
> Hi Terry,
>            You could look at using an opto-interrupter with markings 
> on the disk. Both light and signals could be fed to and from with 
> complete isolation. You could also use optical feedback from the 
> stationary electrode and compare that with the mains waveform. I am 
> planning to use some of these ideas in various ways at some stage.
> 
> Malcolm
> 
> > Original Poster: Terry Fritz <terryf-at-verinet-dot-com>
> > 
> > Hi All,
> >     
> >     I finally got my new synchronous rotary gap together and hooked it
up.
> > The results were dramatic.  My coil's streamers were much better,
longer,
> > etc.  There is no comparison to even my best static gaps.  The
performance
> > is far superior.  
> >     I looked at the output on the scope and there was no quenching to
be
> found
> > (sorry no pics yet).  The power bounced back and forth from the primary
to
> > the secondary several times.  The voltage at breakout was a little
better
> > at around 230kV.  The rotary seems to provide a very stable and
controlled
> > spark which feeds the streamers very well.
> >     I'll study all this much more in the near future.  The points of
the gap
> > are 3/8 inch brass all thread sections that seem to burn fairly clean.
> > They stay very cool in the considerable air flow.  The rotor balance is
not
> > perfect but the frame is pretty strong and it is not serious.  These do
> > take considerable skill and equipment to build.
> >     I do have one question.  Is there a way to hook up a neon lamp,
high
> > brightness LED,  etc. to shine on the rotor to indicate were in the ac
> > cycle the rotor is at.  In other words, I am trying to get the gap
points
> > to line up at the peak of the AC cycle.  There must be some simple
device
> > to do this.  I do have a nice inductive timing light that may be a
> > possibility too.  With my voltage probe down I can't see the cap
voltage
> > directly.
> > 
> >     Terry Fritz
> > 
> > 
> > 
>