Vintage Used GE Selsy Motor 2JD123A10A 115VAC 60Hz Primary and 57.5VAC 3 Phase Secondary.
Sometimes referred to as a Rotary Transformer.
Connected and Confirmed Output Voltage from the 3 phases. I found about 45VAC from each of the 3 legs.
Confirmed no shorted or open windings.
Shaft OD is about .232" with a flat on one side and extends about .736 from the face. End of shaft appears to be drilled and tapped.
Data plate also has GTN stamped on it.
Yellow and Black leads are 115VAC Primary, the other 3 are the Outputs.
Scuffs Scratches Oxidation and Wear.