Patent ID: 7541710

Claim:
A rotating electric machine comprising a rotor having effective magnetic pole opening angles for defining a plurality of poles disposed in a torsional position (skew) with respect to a rotor axis and a stator having a plurality of slots, said rotor is axially divided into a plurality of rotor pieces which respectively have different combinations of an axial length and an absolute value of a skew angle, wherein the rotor is divided into four rotor pieces respectively, so as to make axial lengths of the two rotor piece groups to be the same, when defining two continuous rotor pieces in said divided rotor pieces from an axial end of the rotor as a first rotor piece group, and the remaining two continuous rotor pieces as a second rotor piece group, wherein adjacent rotor pieces in said first rotor piece group and said second rotor piece group are bonded with each other, respectively, so as to contact materials constituting an effective magnetic pole opening angle with each other, wherein said first rotor piece group and said second rotor piece group are bonded so as to shift material constituting an effective magnetic pole opening angle of the first rotor piece group and material of the second rotor piece group with each other at a predetermined shifted angle in the rotating direction, and wherein each of said rotor pieces is provided with a skew angle so that phase difference between the electric angles between oppose ends of the four rotor pieces being equal to each other, and said shifted angle in bonding portions between said first rotor piece group and said second rotor piece group is equal to a skew angle between opposite ends of said rotor piece.