Re: 1/3hp srsg phase adj cap

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi John,

Thanks for the info. One more question. I assume the cap is a motor run
cap? I have
some other hefty 150uF AC caps I could try unless motor run caps are
required. Btw,
my motor is 1800 rpm. I decided to rebuild my g10/tungsten rotary and stop
playing
around with some of the other gaps. The rotary has never given me any trouble,
handles the power, and is faithful.Besides, the weather is looking good for
some
outdoor max arc runs and the rotary is the only gap up to the task of taking on
Bert Pools challenge <grin>.

Take care,
Bart

Tesla list wrote:

> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<FutureT-at-aol-dot-com>
>
> In a message dated 5/3/02 12:48:35 PM Eastern Daylight Time, tesla-at-pupman-dot-com
> writes:
>
> >
> > Hi All,
> >
> > If anyone has run an srsg with John Freau's phase adjustment circuit
> > with a 1/3HP motor or near, I'm curious what cap value you ended up
> > using (if any).
> >
> > Thanks,
> > Bart
>
> Bart,
>
> It seems that some folks needed to use as much as 230uF for
> a 1/3HP motor, but other folks needed only 120uF or less.  It
> seems to depend on the motor brand and type, the motor RPM,
> etc.  I guess the key as usual is to measure the max reso rise
> across the motor, and look for a max rise of 5 to 10 volts or so
> across the motor at a certain variac setting.  Then check for an
> adequate phase shift range.
>
> Cheers,
> John