Patent ID: 7260880

Claim:
A method for manufacturing a stator core for a dynamoelectric machine, said method comprising: preparing a cylindrical laminated body by preparing a continuous first sheet in which first recess portions are formed at a predetermined spacing by press-punching from a strip-shaped first magnetic steel sheet material and winding said first sheet into a helical shape such that said first recess portions are superposed in an axial direction; preparing a plurality of second sheets having a predetermined length in which second recess portions are formed at a predetermined spacing by press-punching from second magnetic steel sheet material having a sheet thickness greater than that of said first magnetic steel sheet material; bending said second sheets into an annular shape; stacking said second sheets bent into the annular shape on both axial ends of said laminated body such that said second recess portions are superposed on said first recess portions in the axial direction; and integrating said laminated body and said stacked second sheets bent into the annular shape by applying several strips of welding on an outer circumferential surface of said laminated body and said second sheets so as to extend from a first end to a second end in the axial direction, wherein the second recess portions are formed at the predetermined spacing on the plurality of second sheets before the plurality of said second sheets are bent.