On Mon, 07 Dec 2015 17:06:05 -0600, Jon Elson
wrote:

wrote:

(we're talking about the pump motors here.)

I am almost 100% sure that the motor is not shaded pole. A shaded pole
motor starts because of the shorted winding "shading"
a pole. This shorted winding is that heavy gauge copper loop around
the laminations. They are not very effiecient and draw almost the same
current when loaded or unloaded. Your motor sounds like a brushless DC
motor.
Well, it COULD be. But, it ONLY has one winding! Two wires plus safety
ground. And, it seems to have (really strong) magnets in the rotor. I
can't figure out how you can get a synchronous motor to run the right
direction with only one winding. It REALLY looks like one of those old
phonograph motors, just bigger.

Jon
I thought you were talking about the main motor. Shaded pole motors
could be used for pump motors. They often are because they run just as
hot when stalled as when running so if one is stalled they usually
won't overheat. Though there applications where a fan is connected to
the motor shaft to cool the motor and they will overheat up if stalled
too long, usually a couple minutes at least. Still, with a magnetic
rotor I don't understand how it would work as a shaded pole. I'm
mystified and am going to try to find out just how your motors work.
Though shaded pole motors have the advantage of speed control by
changing the voltage, starting in the preferred direction, and
resistance to overheating when stalled they still waste a lot of the
power consumed as heat. And this would seem to keep them from being
used in modern appliances. Do these motors have the shorted winding? A
heavy, like 10 gauge maybe, bare copper loop near one of the corners
of the lamination stack, opposite the coil? If so then they are indeed
shaded pole motors. If there is no shorted winding then I would say
they are not.
Eric