Permanent magnet type rotary electric machine and electric power steering apparatus using the same

A permanent magnet type rotary electric machine comprising:

• a rotor having a plurality of magnetic poles composed of permanent magnets and a rotor core;
• and
• a stator including armature windings and a stator core which is provided with slots for incorporating said armature windings and has a plurality of teeth facing said rotor,
• each of said teeth of said stator core being provided with supplemental grooves at portions facing said rotor,
• wherein not less than two regions different in magnetic circuit design are provided in a rotational axis direction of said rotor, the regions being different by changing a cross-sectional shape in the rotational axis direction in a cross-section perpendicular to a rotational shaft of said rotor having said permanent magnets and said rotor core;
• the supplemental grooves are provided in axial partial regions of said tooth of said stator core;
• and
• the region in which the supplemental groove is provided is each partial region for each region facing a region same in magnetic circuit design of the rotor.

A permanent magnet type rotary electric machine comprising:

• a rotor having a plurality of magnetic poles composed of permanent magnets and a rotor core;
• and
• a stator including armature windings and a stator core which is provided with slots for incorporating said armature windings and has a plurality of teeth facing said rotor,
• each of said teeth of said stator core being provided with supplemental grooves at portions facing said rotor,
• wherein the plurality of said magnetic poles of said rotor are configured by arranging not less than two groups of permanent magnets in a rotational axis direction, respectively;
• the supplemental grooves are provided in axial partial regions of said tooth of said stator core;
• and
• the region in which the supplemental groove is provided is each partial region for each region facing not less than two groups of said permanent magnets arranged in the rotational axis direction.