| 摘要 |
A stamping step of forming a plurality of band-shaped core sheets (11), (12) having arc-shaped segment core sheets (15), (15a), the adjacent segment core sheets (15), (15a) connected together by narrow-width connecting portions (16), (16a) provided therebetween, the segment core sheets (15), (15a) having a plurality of pole sections (13), (14), (13a), (14a) protruding radially outward; and an annular shape forming step of winding the plurality of band-shaped core sheets (11), (12) in a spiral form while bending the band-shaped core sheets (11), (12) at the connecting portions (16), (16a) and superimposing the pole sections (13), (14), (13a), (14a) vertically one on another, thereby laminating the band-shaped core sheets (11), (12); wherein in the stamping step, notches (23a), (23) to be positioned in correspondence with the connecting portions (16), (16a) bent in the annular shape forming step are formed at radially outward sides of joining portions (22a), (22), the joining portions joining the adjacent pole sections (13a), (14a), (13), (14) in the segment core sheets (15a), (15) and positioned above and below the bent connecting portions (16), (16a).
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