MANUFACTURING METHOD OF LAMINATED CORE AND, LAMINATED CORE MANUFACTURED USING THE SAME

PROBLEM TO BE SOLVED: To provide a laminated core in which reduction of material yield is prevented, shape precision of the laminated core is improved and a width of a magnetic pole axial piece is changed.SOLUTION: A manufacturing method of a laminated core in which a plurality of arcuate segment core pieces are die-cut from a bar, the segment core pieces are laminated in an annular shape, and a width is gradually reduced in upper and lower portions of a magnetic pole axial part, includes: a slot die-cutting step of die-cutting and forming slots with different widths. The slot die-cutting step includes the steps of: forming a middle layer portion of the magnetic pole axial part; forming an upper layer portion and a lower layer portion of the magnetic pole axial part; and forming a top layer portion and a bottom layer portion of the magnetic pole axial part.