Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2006-07-19
2008-03-11
Mullins, Burton (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S215000, C310S216006, C310S254100, C310S194000
Reexamination Certificate
active
07342344
ABSTRACT:
The present invention provides an outer rotor type motor for a drum type washing machine to reduce material and weight for fabrication, simplify fabrication process, provide stable assembly of a stator to a fixing side, such as a tub or a bearing housing, prevent unwinding of stacked steel plates in assembling a helical core, and reduce stress on the steel plates of the core. The present invention includes 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, 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 a fastening means for at least two steel plates wound in a helix to prevent unwinding of any two adjacently stacked steel plates and prevent gaps between any two adjacent layers of the stacked steel plates.
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