Re: Motor Phase Controller problems

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com>

Dan,

the five volt rise is where-ever you can get the highest voltage
on the variac dial.  Look for the max voltage that's acheived.

John


>
> Yeah, i'll try a larger variac tomorrow.  I'll try taking some measurements
> as well.  I guess that 5V resonant rise should be midpoint on the variac???
>
> Thanks
> Dan
>
>
>
> > Dan,
> >
> > If you're getting 45 degrees of mechanical phase shift on an
> > 1800 rpm motor, that's normal.  If you're getting 45 degrees
> > of mechanical shift on a 3600 rpm motor that's not normal.
> > If you're getting 45 degrees of electrical shift, that's not
> > normal either.  You should get about 90 degrees electrical.
> >
> > I'm curious if you got the 5V resonant rise across the motor
> > at some variac position with any of the capacitor values you
> > tried.  I've never tried a small variac.
> >
> > John
> >
> >
> > >
> > > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > > <dhmccauley-at-spacecatlighting-dot-com>
> > >
> > > I'm currently using John Freaus simple motor phase controller basically
> > > using my variac and a capitor (simple LC phase-shifter) circuit, but
> have
> > > been getting the following problems:
> > >
> > > I currently am getting about 45 degrees of adjustable phase shift.
> However,
> > > when I try to go beyond that, the motor simple looses locks, slows down,
> and
> > > eventually stops.
> > > I am currently using a 2A variac (small one) and tried a variety of
> > > different capacitor sizes, but can't seem to get rid of this problem.
> > >
> > > Could it be my variac is too small (inductance values too small???)
> > >
> > > Thanks
> > > Dan
> >
> >
> >
> >
> >
> >
> >
>
>
>