I have the spindle drive motor out of a Toshiba CD-ROM drive that has a rotor that's a steel cup with a magnetized ring inside, I would guess it has multiple poles. This fits over a laminated stator of 9 arms, each arm having a coil of wire. There are three pads for the wires from the stator. I'm not sure how the stator is wired, maybe three sets of three arms in series? There are also three Hall effect sensors(?) there, too.
I have a red LED soldered across two of the pads, and when I give the rotor a real good spin, the LED lights up brightly. I can measure the DC resistance of about 3 ohms between each pad and they're all equal so I would say that this indicates the windings are equal, i.e. they are not center tapped. What I'd like to do is rectify the AC output of the three pads, but how? Should I use 6 diodes like the alternator in a car has? Or treat it as a center tapped winding?