Abstract: A stepping motor includes a stator and a rotor. The stator has pole teeth projecting from the inner surface at a constant pitch. The rotor has first through fourth rotor sections, and permanent magnets are embedded into the outer surface of each of the first through fourth rotor sections at a pitch equal to the pitch of the pole teeth. Two coils are provided in the stator so as to generate looped magnetic fluxes in the stator. A first offset corresponding to one half of the pitch of the permanent magnets is provided between each permanent magnet of the first rotor section and a correspond permanent magnet of the second rotor section, and a second offset equal to the first offset is provided between each permanent magnet of the third rotor section and a correspond permanent magnet of the fourth rotor section.

Abstract: An induction motor capable of producing an increased torque has a stator for generating a rotating magnetic field, a stator fixed to a shaft, a cylindrical member disposed within an inner space defined by the rotor and rotatably supported by the shaft, and magnets attached to the circumference of the rotor such that the magnets face the rotating magnetic field. The induction motor may be provided with a mechanism for adjusting the effective magnetic force of the magnets. The magnets may be permanent magnets or electromagnets. Also, a synchronizing mechanism may be provided to prevent the cylindrical member from lagging behind the rotor. A linear induction motor includes a straight primary coil assembly and a straight secondary coil assembly. One of the primary coil assembly and the secondary coil assembly is movable relative to the other. Also, a plurality of magnets are disposed in the secondary coil assembly.