I am restoring a 1952 Emerson Electric 74646-AL Hassock fan. When I turn the switch the thing hums but is locked up solid. When I attach the power cord directly to the motor it runs fine. So the problem is either the switch or this part: What exactly is this? It’s got three wires coming off it, all cloth covered with a single thin copper wire inside. Is this what’s hanging me up?
That’s your speed coil. Not likely to be causing your motor to lock up. That’s generally caused by lack of oil, the wrong oil, or worn bearings. Does the blade spin freely and coast to a stop when spun by hand?
Nope. Motor is perfectly vertical. When I hook up the motor and turn it on the rotor latches onto one side of the magnetic coil and won’t let go. Before I took the whole thing apart, when I attached the power cord directly to the motor it ran fine but when hooked up through the switch it would lock up. After cleaning it and putting it all back together, it now locks up whenever under power from the switch or directly.