Patent ID: 7626305

Claim:
An armature core of an electric motor comprising: a plurality of tooth portions arranged circumferentially about a center axis, and extending in a radial direction; a supporting ring portion supporting the plurality of the tooth portions along an outer circumferential surface of the tooth portions; a wire-wound portion arranged at each tooth portion and connected to the supporting ring portion; a tip portion arranged at an innermost portion of each tooth portion, the tip portion and the wire-wound portion being in axially different positions from each other; and a connecting portion connecting the wire-wound portion and the tip portion, the connecting portion having a width in a circumferential direction that is greater than a width of the wire-wound portion but smaller than a width of the tip portion, and the connecting portion is thinner than the wire-wound portion; wherein the width of the wire-wound portion expands gradually toward the connecting portion at an end portion of the wire-wound portion; and each of the wire-wound portion, the tip portion, and the connecting portion is defined by a laminated body of a plurality of plates, and each of the wire-wound portion, the tip portion, and the connecting portion include the same number of plates.