um when i said cemf wasnt thinking of the magnetic fields directly affecting each other, magneto motive force (mmf), as opposed emf. an mmf will enter the coil creating an electrical force (emf) i dont know if the polarity of the cemf is affected by the polarity of the mmf instead of whether mmf is building up or collapsing. i think i still dont know if this creates the opposing voltage polarity or the (north/south) poles of the incoming field creates the opposing voltage polarity. this is a very interesting point i would like to figure out!! maybe i am wrong!! maybe your idea of opposite poles would allow an additive voltage benefit to your outside input instead of an opposing voltage. in terms of magnetic attraction if i understand it right the iron rotor wont care what the poles are doing. the rotors more interested closing the air gap for the given magnetude of flux passing through the loop.

what do you think?
Eric