Patent ID: 8164229

Claim:
An armature for a rotating electrical machine, comprising: a cylindrical core having a plurality of longitudinally extending slots that are dispersedly arranged in a circumferential direction; and coils wound around the slots, wherein each of the slots is formed such that an inner circumferential opening thereof that is open radially inwardly is smaller in a circumferential width than a slot interior positioned on a radially outer side of the inner circumferential opening, and linear conductors forming the coils are each formed to be larger in the circumferential width than the inner circumferential opening, the coils include coil end portions connecting between coil side portions arranged in different ones of the slots at opposite longitudinal ends of the core, and the coil end portions located on one longitudinal side of the slots are curved coil end portions formed as curved radially inwardly, the curved coil end portions each include radial conductor portions radially extending from the coil side portions, and a circumferential conductor portion connecting between a pair of the radial conductor portions on a radially inner side of the inner circumferential openings, and the radial conductor portions are each provided with a narrow-width concave portion that is recessed relative to other portions of the radial conductor portion, at a radial position in the radial conductor portion corresponding to one of the inner circumferential openings, so as to be smaller in the circumferential width than the inner circumferential opening.