Re: Problem with Synchronous Motor and Timing Light

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

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


I tried this, but there is no movement between rotor and motor shaft.
Actually, the explanation posted before by one individual makes sense if
thats the case.

Dan



> Mark the rotor and motor shaft with a small dot.  Perhaps your finger
> pressure caused the rotor to turn slightly on the motor shaft.
>
> Dr. Resonance
>
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>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Friday, August 16, 2002 7:14 PM
> Subject: Problem with Synchronous Motor and Timing Light
>
>
> > Original poster: "Daniel McCauley by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com>
> >
> > Okay, so I picked up a strobe light from Radio Shack this evening and
with
> > Terry's modifications, made me a 60Hz timing light.
> >
> > I got my SRSG and the timing light, turned the lights off, and tested
> away.
> >
> > However, I do not know too much about how synch motors really work, but
> here
> > were my results:
> >
> > 1.  The timing light worked great.  Basically froze the rotor to free
time
> > so you could see the position of the rotor in respect to the 60Hz input
> > power.  However, the problem is that if I briefly touched the side of
the
> > rotor to slow it down just for an instant (yes, it does burn my finger),
> the
> > rotor locks in speed again, but in a slightly rotated position and will
> > continue to move about everytime i slow it down for an instant.  Is this
> > normal for a synchronous motor???  I was under the impression that once
> > attached securely to the shaft that it would maintain its relative
> position
> > forever unless you rotated the rotor about the motor axel.  What are
your
> > thoughts??
> >
> > Thanks
> >
> > Dan
> >
> >
> >
>
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