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Re: motor start/run windings??

Original poster: "Michael Rhodes by way of Terry Fritz <twftesla-at-uswest-dot-net>" <rhodes-at-fnrf.science.cmu.ac.th>

I just dismantled a motor from my submersible pump to see
about using it for an RSG.  It also has three wires, black, yellow
and red.  On mine the black and red are the line inputs and
a 6uF 350VAC starting cap is across the yellow and red
leads.  On yours my guess is the centripetal switch is across
the yellow and red in place of the starting cap for high
torque spin up.  As for getting warm in 30 secs., check
and be sure the switch is not shorted out now after your
'smoke' test:-;


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, May 03, 2001 7:01 AM
Subject: motor start/run windings??

> Original poster: "David Knaack by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <dknaack-at-rdtech-dot-com>
> I have salvaged the 1/4hp motor out of a clothing
> drier, hopefully for use in rotary spark gap.  It
> appears to be a synchronous motor.
> It has three input wires, black, yellow and red.
> I assumed that black was ground, and attached it
> to my variac.  I then flipped a coin and attached
> a lead to one of the other leads.  Flip the power
> switch and FFFFTTT, the magic smoke all squirted
> out of the small-gauge lead.  So I put a new lead
> on the other input, and the motor spins up, and
> a centripetal switch of some sort on the shaft
> clicks.  The motor then seems to run at a constant
> speed.
> The problem is that the motor windings get warm
> to the touch in less than 30 seconds.  I don't
> know if I've got things connected correctly or
> not.  I was thinking maybe I'm powering the start
> winding or something, but the diagram on the
> schematic shows the start and run windings connected
> to an internal switch, which I think is the one I
> see change positions when it gets up to speed, so
> I kind of thought it would handle switching start
> and run windings itself.
> Anyway, any suggestions would be appreciated, I can
> provide pictures of the motor and the schematic that
> came out of the dryer if it would help.
> Thanks
> DK
> --
> 99 little bugs in the code, 99 bugs in the code,
> fix one bug, compile it again, 101 little bugs in the code.