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Re: saftey gap problems

> Original Poster: "Grayson B Dietrich" <electrofire-at-juno-dot-com>
>

Hi Grayson,

I can confirm what John said about the phase position being criticle. I fell
under a situation where I just happened to position my rotor onto my motor
shaft in the perect condition. I then decided I would try a little this way
and that way and found lot's of unpleasantry's with spark length. It took me
a while (back and forth, trial and error, etc..) until I got it back to it's
best position. It was a few degrees off the peak and "not" at the top of the
peak that I found the best position for the rotor.

I'm also one of those guys working on the variable inductance for phase
control. I have found something that works in simulation for enough degrees
to make a differnce, however, I still can't get a full 45 degrees with the
variac inductance allowable amount and the motors true inductance - but there
"is" enough of a degree change. I have my 10A variac home now and spark gap,
and about ready to begin experimention with it, however, I've decided "my"
best method for a scope signal is going to be a proximity sensor since it
won't matter what type of metal I use to generate a signal. (in other words,
I can leave my tungsten electrodes in place and use them). I'm hoping to get
a prox at work this week and replace the stationary with the prox to view the
variacs phase capabilities. It takes more than a resistor though. There's a
cap and resistor needed in parallel to motor to set the variacs inductance
capabilities (no resistor across the variac). I think this is going to work
to some "degree" (pun intended). I'll post my results when they are results.

Bart

>
> Thanks, John.
>
> Hmmm...   maybe, if I hear anything more about that supposed method of
> using a variable inductance and a resistor equal to the impedance of the
> motor to vary the phase, then finding that "sweet spot" won't be so hard.
>
> Grayson Dietrich
> http://www.electrophile.8m-dot-com
>
> On Thu, 02 Mar 2000 17:10:37 -0700 Tesla List <tesla-at-pupman-dot-com> writes:
> > Original Poster: FutureT-at-aol-dot-com
> >
> > In a message dated 00-03-02 08:36:31 EST, you write:
> >
> > << Do folks often have problems with saftey gaps if you are running
> > a RSG?
> >
> > > Thanks all,
> >
> > > Grayson Dietrich >>
> >
> > Grayson,
> >
> > You may need to re-phase the sync gap by trial and error until it's
> > working at it's best and the safety gap stops firing.  The best
> > position
> > can be quite critical.  the final adjustment must be made at full
> > power.
> >
> > cheers,
> > John Freau
> >
> >
>
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