Patent ID: 8847461

Claim:
A stator core for a motor, comprising: three split cores arranged to surround a rotatably-held rotor, each of the split cores including: a core-back portion including an inner surface facing the rotor; a tooth base portion protruding radially inwards from the inner surface of the core-back portion; and a pair of tooth overhang portions protruding from both sides of a tip end of the tooth base portion in a circumferential direction; wherein the core-back portions are connected through connecting walls arranged at circumferential ends thereof to one another to define a substantially cylindrical shape; the inner surfaces of the core-back portions include a pair of orthogonal surface regions extending from both sides of a base end of the tooth base portion in a direction orthogonal or substantially orthogonal to the tooth base portion, the orthogonal surface regions extending radially outwards beyond projection positions of tip ends of the tooth overhang portions when the tooth overhang portions are projected on an imaginary plane including the orthogonal surface regions in parallel or substantially in parallel to the tooth base portion; a half of a total distance between outermost circumferential ends of the pair of orthogonal surface regions minus half of a circumferential distance between both sides of the base end of the tooth base portion is smaller than a total length of the connecting walls; and a total distance between the imaginary plane and circumferential tips of the connecting walls is larger than a total distance between the imaginary plane and bases of the tooth overhang portions.