On 03/28/2019 04:24 PM, Gene Heskett wrote:
This one has a PM rotor, and it all runs in the bore of a potted stator,
which I assume has a shaded pole lashup for starting. I not shaded pole,
then it will run synchronously, either direction. If if runs at all.
Yes, the pumps in our washing machine have a PM rotor, and
the stator looks a LOT like the old "phonograph" motors, but
without the shaded pole. When the AC is applied, the rotors
vibrate wildly until they manage to jump into synch with the
field, and so it starts in a random direction.
They have a 1/4 turn slip coupling between the rotor and the
pump that allows this vibration start to develop. Pretty
crazy scheme.
Jon
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