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It's a sort of 'inside out' motor, the armature/stator is fixed to
what looks like a panel mount. It has two independent windings, each
of about 50 ohm DC resistance.
The outer rotor appears to be just a light alloy diecasting, and is
rigidly fixed to the 4mm dia spindle. No sign of any permanent
magnets.
My best guess is some sort of control device, a current through one
winding induces a current in the second which will vary as the outer
rotor is turned. Any better or more detailed ideas? I've landed myself
with a number of them as part of a job lot.
Cheers
Tim
Dutton Dry-Dock
Traditional & Modern canal craft repairs
Vintage diesel engine service