You've shown a lot of curiosity in the past, so this would be a good
opportunity to examine this motor closely to determine what type it is. My
practice is to open any used electrical devices.
I'm certain that there is no internal capacitor, and no centrifugal switch.
You should double-check the winding resistance.. they usually read like
center-tapped transformer winding (20, 20, 40 ohms for example). These are
sometimes described in motor books as 2 phase motors (derived from the
capacitor terminal that's not connected to the AC source/line), but
otherwise known as PSC, permanent split capacitor as Ned mentioned.
The electricmotorwarehouse spec sheets state that it's a PSC ball bearing
motor with CCW rotation. The image shows a large oval-shaped capacitor
attached to the motor in the picture, indicating that it's a run capacitor
(maybe it was removed from your motor). The list notes indicate that it
would be a 4uF 370VAC cap for the ball bearing motor.
That means no start/run windings, because it's not a split phase capacitor
start motor.
Motors in the speed range of this one are typically designed/rated for fan
duty, but that doesn't neccessarily mean that it can't be used for other
purposes.
You'll most likely never see a 700 rpm motor that's a split phase motor with
start/run windings.. they're generally always 1725 or 3450 rpm.
The plug you described may have been specific to the appliance that the
motor was intended for, and the capacitor may have been mounted somewhere
off the motor.
A capacitor value of 2 to 10uF would probably work as long as it's an AC cap
rated at 370VAC. A cap with a diferent value than specified may affect the
operating temperature and produce a small change in speed.
WB
............
"Tim Williams" wrote in message
...
"Tim Williams" wrote in message
...
From what I can tell, white and red are the run winding ... and black
is the start winding, common to white ...
So, is it okay to leave black open? Hand start maybe? (Ouch) Keep it
connected? Switch off after starting????
Tim
--
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Website @ http://webpages.charter.net/dawill/tmoranwms