Re: making a motor synch?

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

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

In a message dated 6/1/03 6:47:20 PM Eastern Daylight Time, 
tesla-at-pupman-dot-com writes:

David,

If it's got a centrifugal switch inside, then it probably has a start
winding and is not a split phase type.  This type should work OK,
if the rotor is not too heavy, and the spinning electrodes are not too
large/heavy.  A lot of folks have used
the bench grinder motors and modified them, but of course they
dont' have as much starting torque as a cap-start motor.
I do prefer the 3600 rpm types to the 1750 rpm types due to the
faster dwell time and fewer spinning electrodes with the 3600 rpm.

What's the armature diameter and the width of the flat that
you created?

I agree with the Christoph that it's a good idea to try a larger
run cap, and see if that makes it sync-lock.

John

> >Yea, I'm not sure either since this is my first real try at
> >modifying an induction motor. One other thing that I may
> >need to mention is that this motor was the motor of a Black
> >&Decker bench grinder and appears to be of the split phase
> >type, since it has no external starting capacitor, only one
> >small running capacitor under the cradle. I think Bill Wysock
> >stated that this was not the proper type of motor to modify
> >for salient synchronous operation. I'd really rather get a hold
> >of a 1725 RPM motor for this purpose anyway :^)
> >
> >David Rieben