AC motor and control apparatus for the same

An AC motor comprising:

• a stator having M pieces (M is an integer equal to or higher than 3) of stator pole groups SPG arranged in a rotor axial direction of the AC motor, each of the stator pole groups being composed of a plurality of stator poles arranged in a circumferential direction of the AC motor, the plurality of stator poles belonging to each of the stator pole groups arranged in the circumferential direction being assigned to each of phases of the AC motor;
• a back yoke mutually magnetically connects the stator pole groups;
• “M−1” pieces of annular slots SR each formed between two of the stator pole groups SPG;
• “M−1” pieces of annular windings WR each of which is arranged in each of the slots SR, wherein each of the annular windings is supplied with a one-way current;
• and
• current supply means for supplying the one-way current to each of the windings WR,
• wherein the current supply means comprises circuitry supply the one-way current such that
• i) the one-way current supplied through each of the windings WR is directed oppositely to each other in turn in the rotor axial direction, and
• ii) each of magnetic fluxes φG induced by the stator pole groups SPG is directed in one way, and
• iii) the directions of the magnetic fluxes φG are opposite to each other in turn in the rotor axial direction.