Patent ID: 9496772
Filing Date: 2016-11-15
CPC Classification: H02K

Claim Text:
1. A manufacturing method of a laminated iron core which is formed of a strip-shaped iron core piece, wherein the strip-shaped iron core piece includes segment iron core pieces which are connected through a joint positioned in a radial outside, and each of the segment iron core pieces has an arcuate shape with respectively concentric outer and inner peripheries having different radii, the manufacturing method comprising: folding the joint by which adjacent segment iron core pieces are connected and aligning lateral ends of the adjacent segment iron core pieces; spirally winding the strip-shaped iron core piece while circumferentially shifting mutual joints formed on vertical adjacent layers; laminating upper segment iron core pieces to lower segment iron core pieces that are positioned vertically beneath the upper segment iron core pieces to form the laminated iron core; and crimping upper segment iron core pieces to lower segment iron core pieces through crimp parts formed on the upper segment iron core pieces and the lower segment iron core pieces, wherein the manufacturing method further comprises crush processing for flattening a bulged portion in a thickness direction of the segment iron core pieces formed at a three of folding the joint, the crush processing being performed simultaneously with a time when upper and lower segment iron core pieces arranged vertically are crimped by a crimp pressing mold including a crimp pin that presses the crimp parts and crimps and couples the upper segment iron core pieces to the lower segment iron core pieces, and a crushing pin that pushes and flattens the bulged portion.