Re: Wiring a desk electric fan.
To me that motor looks like it just has a rotor and stator and no commutator.
If it is anything like a scrap modern fan I was given there is a common and three taps.
Just find the two wires with the highest resistance and then connect an old style light bulb the live mains wire and the other end to your motor.
It should run at reduced speed allowing you to measure the voltages on the taps.
Just be careful with the high voltage.
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