Patent ID: 7893591

Claim:
A laminated rotor core including a plurality of band-shaped core sheets each having arc-shaped segment core sheets, the adjacent segment core sheets connected together by a narrow-width connecting portion provided therebetween, each segment core sheet having a plurality of pole sections protruding radially outward, the plurality of band-shaped core sheets being wound in a spiral form and laminated while being bent at the connecting portions with the pole sections vertically superimposed one on another, the pole sections of one band-shaped core sheet being displaced from the pole sections of another band-shaped core sheet by a pitch of one pole section, the laminated rotor core comprising: joining portions each joining the adjacent pole sections of each segment core sheet, the joining portions located above and below each bent connecting portion, and notches each provided at a radially outward side of each joining portion and positioned in correspondence with each bent connecting portion, each of the notches receiving a bulge in the thickness direction of the bent connecting portion formed by bending the connecting portion.