A stepper motor is disclosed which is comprised of planar elements. The motor comprises a disc-shaped rotor which includes a multipolar permanent magnet and generally planar stator coils mounted on opposite sides of the rotor. In order to provide a stepper motor which is efficient and is also relatively...http://www.google.ca/patents/US4922145?utm_source=gb-gplus-sharePatent US4922145 - Stepper motor
