Permanent-magnet rotary electric machine

A method for manufacturing a permanent-magnet rotary electric machine comprising a stator including an approximately ring-shaped core back portion having an angular or rounded outer shape, and 4m main poles radially projecting from the core back portion where m is an integer equal to or larger than 2, each of the main poles having Ns inductor teeth arranged at a regular pitch at a tip thereof where Ns is an integer equal to or larger than 2, and a rotor opposed to the stator via an air gap, the rotor arranged to be freely rotatable and including two rotor units adjacent to each other in an axial direction, each of the rotor units including a pair of rotor magnetic poles and a permanent magnet arranged therebetween, the permanent magnet of one of the rotor units and the permanent magnet of the other rotor unit being magnetized in opposite directions along the axial direction, each of the rotor magnetic poles having Nr magnetic teeth at a regular pitch on an outer periphery thereof where Nr is an integer equal to or larger than 2, the pair of rotor magnetic poles of each of the rotor units are arranged with the magnetic teeth of one of the rotor magnetic poles offset from those of the other rotor magnetic pole by half of the pitch in a circumferential direction and with the magnetic teeth of adjacent rotor magnetic poles aligned with each other in the axial direction, the pitch of the inductor teeth of the stator is different from the pitch of the magnetic teeth of the rotor by approximately 90°/(Ns·Nr), the method comprising the steps of:

• forming a plurality of magnetic plates by punching;
• successively rotating each of the magnetic plates by 90° from an adjacent one of the magnetic plates;
• and
• laminating the rotated magnetic plates.