Patent ID: 7915780

Claim:
A laminated spiral core comprising: core units to form a rotor core, the core units having permanent-magnet attachment portions in which permanent magnets are to be disposed, each of the core units having an arc shape; and a plurality of swage portions to connect the core units by swage joining when the core units are spirally stacked in a predetermined number of layers, the plurality of swage portions provided in the core units in a wave-shape to face the permanent-magnet attachment portions, wherein a swage portion among the plurality of swage portions which is disposed along a substantially central axis of each of the permanent-magnet attachment portions extending in a radial direction from a center of an arc of the core units is closer to each of the permanent-magnet attachment portions than a swage portion among the plurality of swage portions which is positioned substantially at each of ends in a circumference direction of the permanent-magnet attachment portions.