Patent ID: 9660507
Date: 2017-05-23
CPC Classifications: H02K,Y10T

Claim:
1. A method of manufacturing a stator core, comprising: die-cutting iron core materials from a band-shaped magnetic steel sheet, each iron core material being formed into an annular shape and having an inner circumference formed with a plurality of slots and three interconnecting lugs, each lug being formed into a rectangular shape extending radially outward from an annular outer circumference of the magnetic steel sheet, each lug having a distal end formed into a semicircular arc shape; and stacking a number of the iron core materials, wherein in the die-cutting, the magnetic steel sheet includes parts to be die-cut as the iron core materials, and the parts are arranged in two rows in a widthwise direction of the magnetic steel sheet; at least one of the lugs included in one of the two rows is located between the iron core materials lengthwise adjacent to each other in the other row; and marginal regions are provided in parts of the magnetic steel sheet located between the lugs of the iron core materials adjacent to each other in a lengthwise direction of the magnetic steel sheet in a common row, between the iron core material of the one row and the iron core material of the other row and between the iron core materials to be die-cut and each end of the magnetic steel sheet, respectively, the marginal regions being sized to be approximate to a web width in order to join remaining materials after the iron core materials have been die-cut from the magnetic steel sheet.