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Posted by Ulysses on November 28, 2008, 2:49 pm
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> On Nov 25, 10:21=A0pm, cl...@snyder.on.ca wrote:
> > >Ulysses wrote:
> > >> Anyone have any links showing howwashingmachinemotors work? =A0I hav=
e a
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> > >> Kenmore that's perhaps 10 years old and themotorwill sometimes run,
> > >> sometimes just buzz. =A0There is some kind of switch thingy attached=
to the
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> > >> wiring harness that looks sorta like a micro switch. =A0There is a m=
echanism
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> > >> with two springs attached that I think has something to do with gett=
ing the
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> > >>motorstarted.
> > >The mechanism with two springs is a centrifugal switch. =A0Themotorhas
> > >two sets of windings. =A0One is energized when themotorstarts. =A0Once
> > >it's spinning fast enough to activate the centrifugal mechanism, it in
> > >turn activates the microswitch to energize the "run" windings. =A0A co=
mmon
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> > >problem with these motors is the centrifugal mechanism getting clogged
> > >with lint. =A0Clean out the dust and lint with compressed air to see i=
> > >that fixes themotor.
> > The "run" winding is permanently connected. The "start" switch
> > connects the start winding untill themotorcomes up to latching speed
> > - then it disconnects. If the start switch does not make contact only
> > the run winding is energized, and the poormotordoes not know which
> > way to turn and is incapable of producing any starting torque - so it
> > just buzzes.- Hide quoted text -
> > - Show quoted text -
> yes, the start switch should be ON when themotoris stopped.. this
> connects the start winding... =A0 when you apply power, power flows
> through the start switch contacts to the start winding... =A0when themoto=
rstarts spinning, some weights should move the start switch to
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> OFF and =A0disconnect the start winding.
> without the start winding themotorwill hum but will not start and
> will probably overheat in a short time... =A0 or you can start it by
> hand as a test....
> with the start winding temporarily connected, themotorwill start.
> if you do not disconnect the start winding once themotorstarts, it
> will overheat in a short time.
> the start winding pulls a lot of power to get themotorstarted but is
> not designed to be on full time
> (this is a simplifed explination leaving out the part about the phase
> offset)
> Mark- Hide quoted text -
> - Show quoted text -
From what you are saying these problems could be caused by a bad
switch or stuck centrifugal weights. It also sounds like I need to
understand "phase offset" in order to really understand what's wrong
here. I know a little about phases when applied to 240VAC and
generators but my mind is a blank when it comes to 120VAC.
Meanwhile, back to my search for a switch....
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