Rotor for permanent magnet type motor, method of manufacturing rotor for permanent magnet type motor, and permanent magnet type motor

A method of manufacturing a rotor for a permanent magnet type motor, the rotor having rotor core blocks in a multistage in an axial direction formed by incorporating permanent magnets of a plurality of magnetic poles, and having a stage skew structure in which the rotor core blocks of each stage are integrally formed so as to be shifted from each other in a circumferential direction,

• wherein when a skew angle per stage is assumed to be Os, skew positioning holes are set at a site in which the symmetry is shifted by ±θs/2° with respect to any symmetry center line based on magnet insertion holes into which the permanent magnets are incorporated, and
• the rotor cores of the multistage skew structure are integrally formed by alternately inverting the rotor core blocks of each stage so that the skew positioning holes match each other.