Re: Motor Phase Controller problems

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

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


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
>
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