Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1986-09-29
1988-03-01
Echols, P. W.
Electrical generator or motor structure
Dynamoelectric
Rotary
29596, 29598, 29609, 29736, 29738, 295642, 72327, 310 42, H02K 106
Patent
active
047288426
ABSTRACT:
A method and apparatus for manufacturing laminated assemblies having ridges formed on projections which interlock with recesses of adjacent laminations. The improvement to the laminated assembly is a projection with a smaller cross-sectional area than the recess and with a plurality of exterior longitudinal ridges protruding from the projection surface for securing adjacent laminations together by compressive interference fit between the ridges and the recess in interlocking relationship throughout the laminated assembly. An improvement in the method for the manufacture of a pack of metal laminae by use of a multistation progressive die operation on a strip of material, during the step of punching the recesses and simultaneously forming interlocking projections in a lower die, the improvement being forming the projection with a smaller cross-sectional area than the recess and with a plurality of exterior longitudinal ridges protruding from the projection surface for securing adjacent laminations together by compressive interference fit between the ridges and the wall of the recess. The projection is formed in a lower die of the multistation progressive die apparatus, wherein the lower die has a plurality of longitudinal grooves on the interior surface of the lower die to produce the ridges protruding from the circumferential surface of the projection simultaneously as the punch produces the recess in the upper portion of the plate.
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Carbet Corporation
Echols P. W.
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