Abstract: An electric motor-generator with a plurality of field coils spaced about the periphery of a stator, and a plurality of permanent magnets spaced about the periphery of each of a pair of rotors, the pair of rotors disposed one on each side of the stator, such that during rotation of the rotors, a center of each magnet generally passes across a center of each coil. The magnets arrayed on respective rotors in alternate pole orientation N-S S-N, the magnets of one rotor offset from the magnets of the other rotor by one pole orientation, such that as a N pole on the one rotor is passing directly across one end of a field coil, a S pole of a corresponding magnet on the other rotor is passing directly across the other end of the field coll. A rotary electrical switch enables paired alternating periods of current flow and no current flow into respective stator field coils, such that in a period pair the period of current flow is shorter than the period of no current flow.

Abstract: An electric motor-generator with a plurality of field coils spaced about the periphery of a stator, and a plurality of permanent magnets spaced about the periphery of each of a pair of rotors, the pair of rotors disposed one on each side of the stator, such that during rotation of the rotors, a center of each magnet generally passes across a center of each coil. The magnets arrayed on respective rotors in alternate pole orientation N-S S-N, the magnets of one rotor offset from the magnets of the other rotor by one pole orientation, such that as a N pole on the one rotor is passing directly across one end of a field coil, a S pole of a corresponding magnet on the other rotor is passing directly across the other end of the field coil.

Abstract: An electric motor-generator with a plurality of field coils spaced about the periphery of a stator, and a plurality of permanent magnets spaced about the periphery of each of a pair of rotors, the pair of rotors disposed one on each side of the stator, such that during rotation of the rotors, a center of each magnet generally passes across a center of each coil. The magnets arrayed on respective rotors in alternate pole orientation N-S S-N, the magnets of one rotor offset from the magnets of the other rotor by one pole orientation, such that as a N pole on the one rotor is passing directly across one end of a field coil, a S pole of a corresponding magnet on the other rotor is passing directly across the other end of the field coll. A rotary electrical switch enables paired alternating periods of current flow and no current flow into respective stator field coils, such that in a period pair the period of current flow is shorter than the period of no current flow.