Patent ID: 7262540

Claim:
A stator of an outer rotor motor for a drum washing machine, comprising: a helical core having multiple layers formed by winding a steel plate in a helix starting from a bottom layer to a top layer, the steel plate having a base portion with teeth projected from the base portion; an upper insulator of an electric insulating material covered on an upper side of the helical core in a shape complementary to a shape of the helical core; a lower insulator of an electric insulating material covered on a lower side of the helical core at the time of assembly with the upper insulator having a shape complementary to a shape of a helical core; and fastening means for preventing unwinding of any two adjacently stacked layers and preventing gaps between any two adjacent layers, the fastening means including an engaging protrusion provided on each upper or lower surface of the teeth of the steel plate; and an engaging recess provided on each lower or upper surface of the teeth of the steel plate to correspond to the engaging protrusion.