Helical core and fabricating method thereof

Details Helical core and fabricating method thereof Helical core and fabricating method thereof

2006-10-03

2006-10-03

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S256000, C029S596000

Reexamination Certificate

active

07116031

ABSTRACT:
The present invention provides a helical core and fabricating method thereof, by which a material and weight for fabrication of a core are reduced and by which a fabrication process is simplified. The present invention has a multi-layer structure configured by helically winding to stack a steel plate core from a bottom layer to a top layer and includes the steel plate core blanked in two rows from an electrical steel sheet to form a pair of bases confronting each other in a width direction and teeth protruding from each of the bases to alternately cross with each other, wherein to prevent an unwinding of the steel plate core in a direction reverse to a rotation of the steel plate core and a loosening between the stacked layers of the steel plate core in helically winding to stack the steel plate core, an engaging protrusion is provided to each upper or lower surface of the teeth of the steel plate core and an engaging recess is provided to each lower or upper surface of the teeth of the steel plate core to correspond to the engaging protrusion, wherein a recess is provided to the base to reduce stress in winding the steel plate core, and wherein both corners of an end of each of the teeth is chamfered straight or round to form a ‘C’ shape to reduce vibration and noise generated by cogging torque on driving a motor.

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