I'm in the process of making the hall sensor board to mount inside the motor.
I have also been examining the motor and I also connected the wires to a power source (through a power resistor) to see the different motor positions. When powering 2 wires, the motor can "jump" to two positions, opposite of each other, which is a property of the 4 poles. When turning the motor by hand, it has 24 positions. I don't get why, shouldn't it only have 12? Is it some inaccuracy in the rotor poles that does this?
Here is the motor data:
Rotor: 4 poles.
Stator: 12 poles.
Winding pattern: WYE.
I have identified the 4 poles (North/South) on the rotor.
I also hooked 2 of the power wires to my scope and turned the motor with a powerdrill, the BEMF looks a bit wierd to me, see attached.