Re: sync motor :-( update_1

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Jonathan,

I can't for the life of me understand why the motor is syncing from the
information
you've given. I think Terry made two excellent suggestions, checking with a
black/white strobe and if that test fails, sending it to Terry for testing.

As mentioned, my motor is very similar. My motor does have a start cap
(located on
the side of the motor inside a housing), a fan blade attached to the rear
of the
motor shaft, and can be wired for 120 or 240. I have it wired for 120. If
there is a
model plate attached, check for a wiring diagram to ensure it isn't wired
for 240
(if your supplying 120) or vise-versa.

Take care,
Bart

Tesla list wrote:

> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Kidd6488-at-aol-dot-com>
>
> In a message dated 7/29/01 12:16:04 PM Eastern Daylight Time,
> tesla-at-pupman-dot-com writes:
>
> >
> > Hi Jonathon,
> >
> > There were 4 flats cut, correct? I know this is probably a dumb question,
> > but I just
> > wanted to clarify here. I assume so since you stated flats cut at 90
> > degrees. Ok,
> > here's something else to help us out with your delema:
>
>   Yes, 4 flats. machine cut. Now this is gonna be one of those "Why won't
> this engine start?",  "Is there gas in it?" kinda questions, but, does the
> position of the flats on the rotor matter?
>
> >
> > 1) What is the size of the armature (diameter)?
>
> 3  3/8" dia (± 2 mm)
>
> >
> > 2) What is width of flats AND the width of the non-cut areas between each
> > flat?
>
> .780" flats (.750" of the Acitve pole to active pole, plus 30 thousandths)
> 1.750" non cut
>
> >
> > Just curious on the mechanics of the work done. My flats were cut equal
> > (the spacing
> > between each flat measured the same as the flat width). Used a tach =
> > 1800rpm and
> > solid. I have a centrifigal switch, but works like a champ.
>
> Me, too, centrifigal switch works though. I saw it spark as the S Windings
> kickked off.
>
> My sync motor
> >
> > is rated
> > at 1/3HP, 1725rpm.
>
> Same Here.
>
> >
> > I like others really find it odd it isnt sync'd. When it comes up to speed,
> > is it
> > steady?
>
> Yes, comes up to speed quickly and stays there.
>
> If not, it may be trying to sync but losing sync (you can hear it
> >
> > change
> > speeds near it's top end if this is happening). This is typically caused by
> > too much
> > resistance vs. HP. A 1/3HP motor shouldn't have this problem unless
> > something is
> > really thrown together wrong. Is there a load attached to the motor shaft?
>
> No load at all, only thing a did was TAPE a CARDBOARD circle about 3" dia
> with a line drawn on it.
>
> If so,
> >
> > what's the load?.
> >
> > Regards,
> > Bart
>
> ---------------------------------------
> Jonathon Reinhart
> hot-streamer-dot-com/jonathon