On a Magnetic motor we need the polarity to reverse at 180 degrees to keep the motor in a constant?

Question

Is it possible to reverse the polarity at 180 Degrees on a Magnetic motor so the magnetic fields continue as overlaping increasing fields like it did from top to 180 Degrees. Without reverse polarity at 180 Degrees we have a break point.

Answer 1

A motor's torque is maximum when the rotor is about 90 degrees out of phase magnetically with the stator.  Any more than that and the rotor again approaches equilibrium, albeit an unstable one.  In most motors, it isn't so much the alternation of the magnetic polarities that provides the driving force so much as the the poles' rotation about the stator that drives the rotor.  This rotation is inherent in a three-phase motor or a single-phase motor with a phase splitter.  Otherwise, the motor requires a mechanical asymmetry between the stator and rotor, most often the result of the existing motion of the rotor or somewhat dodgy commutation with the armature.  Such motors often have poor starting torque before the asymmetry is well-established or are less reliable than polyphase motors.