Patent ID: 8860280

Claim:
A rotor for an electric rotating machine, comprising: a rotor core comprised of a plurality of substantially annular steel sheets that are laminated in an axial direction of the rotor core; and a rotating component configured to rotate together with the rotor core, wherein each of the steel sheets has a positioning portion for positioning the steel sheet with respect to the rotating component in a circumferential direction of the rotor core, each of the steel sheets is formed of a rolled steel material and thus has a direction of rolling thereof, for each of the steel sheets, the direction of rolling of the steel sheet is circumferentially offset from both an imaginary line X and an imaginary line Y by predetermined angles which are equal to 45°, the imaginary line X being defined to extend straight, on a plane parallel to the steel sheet, through a center of rotation of the rotor core so as to circumferentially bisect the positioning portion of the steel sheet, the imaginary line Y being defined to extend straight, on the same plane as the imaginary line X, perpendicular to the imaginary line X, each of the steel sheets is shaped so that a circumferential position of the positioning portion of the steel sheet remains unchanged when the steel sheet is front-back inverted about the imaginary line X, and when viewed along the axial direction of the rotor core, at least one of the steel sheets is front-back inverted with respect to and thus forms a mirror image of the other steel sheets.