Patent ID: 9225228
Filing Date: 2015-12-29
Classification: B21D,H02K,Y10T

Abstract:
1. A method of manufacturing a laminated stator core, including forming stator core sheets in one or more lines from a strip material, each of the stator core sheets having an annular yoke piece and chevron-shaped ear pieces, the ear pieces located around the annular yoke piece at equal spaces in a circumferential direction, the ear pieces projecting radially outward from the annular yoke piece, each of the ear pieces having a through-hole; and laminating the plural stator core sheets to form the laminated stator core, the laminated stator core having an annular yoke formed by laminating the annular yoke pieces and ears formed by laminating the ear pieces, the ears located in a circumferential direction of the annular yoke, each of the ears having a bolt-hole formed by the through-holes; the method comprising: forming a recess over one or both of (a) a lateral portion of at least one ear piece of the stator core sheet to be formed adjacent to the stator core sheet and (b) a peripheral portion of the annular yoke piece continuing to the lateral portion, the peripheral portion beside the ear piece; forming the stator core sheet such that one ear piece of the stator core sheet is fitted with a gap in the recess of the stator core sheet; and thereby improving a material yield when the stator core sheets are formed from the strip material.