Patent ID: 8466596

Claim:
A laminated core formed with a predetermined number of straight connected core segments, each of the straight connected core segments having segment yokes connected together by bendable connecting portions, each of the segment yokes having a magnetic pole piece, the straight connected core segments laminated and bent at the connecting portions in a ring shape, the straight connected core segment comprising: a V-shaped cutout formed in a yoke located radially inward from the connecting portion, the V-shaped cutout opening in a radially inward direction with an opening angle of 360°/n given that n is a number of core segments in one connected core segment; a slit formed in the yoke located radially outward from the connecting portion, the slit dividing the adjacent segment yokes located radially outward from the connecting portion; a first through-hole having a circular arc formed in a radially outward end of the V-shaped cutout in contact with the connecting portion; and a second through-hole having a circular arc formed in a radially inward end of the slit in contact with the connecting portion, wherein the radially outward end of the connecting portion is located inward from an outermost end of the laminated core by a distance of 5% or more of a radius of the laminated core; a bottom of the V-shaped cutout is located outward from a radially inward end of the segment yoke by a distance of more than 40% of a radial length of the segment yoke; a radial width of the connecting portion is 1 to 5 times a thickness of the connecting portion; and the second through-hole having a curvature radius larger than that of the first through-hole.