Motor HP - Unusual Value on Label

Washing machine pump motors tend to be shaded pole synchonous motors, with a separate, dry, stator and a ferrite magnet rotor running directly in the 'efluent'. Bitter experience of such, because they get completely seized when you wash shop rags or overalls that have any cast iron powder on them. I got quite good at swapping out the saized one for a cleaned spare...

Washing machine pump motors tend to be shaded pole synchonous motors

That’s the type of motor I was thinking of. Yes, pretty well synchronous, so I wad fairly accurate in my previous posts?

None of my pumps, fans, etc have run in ‘effluent’. The rotors are all in fresh air. The chinese bearings in the Meaco dehumidifiers are the worst, IMO.

Shaded pole come in three varieties, if it has a magnetised rotor it is synchronous, if it has an unmagnetised squirrel cage rotor it is an induction motor, and isn't synchronous. An induction motor relies on having some slip to generate current and hence magnetism in the squirrel cage, and so cannot be synchronous.

The third type have rotors which have both a squirrel cage and permanent magnets. The squirrel cage gets them going, but when close to full speed, the magnets take over and it becomes synchronous. Common low power shaded pole are likely to be pure induction, no need for running at exact speed. 

Edited By duncan webster on 07/09/2023 13:01:25