Patent ID: 7342344
Filing Date: 2008-03-11
Classification: H02K

Abstract:
1. A stator of an outer rotor type motor for a drum type washing machine, comprising: a helical core having multiple layers formed by winding steel plates 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; and 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 the helical core; wherein the base portion of the helical core includes a plurality of slots for reducing stress during winding the core, at least one side in each of the slots comprising a first straight side and a second straight side extending from the first straight side at a predetermined angle, and wherein the second straight side extends from the lower end of the first straight side to an innermost circumference of the base portion.