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,

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