ELECTRIC MOTOR HAVING MAGNETICALLY ISOLATED STATOR AND ROTORGROUPS

摘要

A rotary direct current electric motor in which rotor and stator members are each configured as annular rings, concentric with respect to each other, abo ut an axis of rotation. Either of the rotor or stator members is formed of grou ps of electromagnet pole pairs, the groups substantially equidistantly distributed along the angular extent of the annular ring, each of the groups comprising magnetic material magnetically isolated and separated from the other groups. The other member comprises a plurality of permanent magnet pol es substantially equidistantly distributed with alternating magnetic polarity along the angular extent of the radial air gap formed between the members, t he permanent magnet poles having a discontinuous magnetic return path, thereby dividing the member into magnetically isolated groups of permanent magnet poles.