Patent ID: 7362028

Claim:
A stator of an outer rotor motor for a drum washing machine, comprising: a core having multiple layers, the core having a base portion with teeth projecting from the base portion; an upper insulator of an electric insulating material covering an upper side of the core in a shape complementary to a shape of the core; a lower insulator of an electric insulating material covering a lower side of the core in a shape complementary to the shape of the core; and a plurality of fastening portions formed at each of the upper and lower insulators projecting from an inner side of each of the upper and lower insulators the core toward a center of the stator for fastening the stator to a tub, each of the plurality of the fastening portions including a boss having a ridge, wherein the boss has a fastening hole for securing the stator to a tub wall with fastening members, and extends toward a confronting insulator from each of the fastening portions, wherein the ridge projects toward the confronting insulator from the boss, and wherein the confronting ridges are in contact with each other.