Method of making a stack of electrical sheet-metal lamellae with

Details Method of making a stack of electrical sheet-metal lamellae with Method of making a stack of electrical sheet-metal lamellae with

1983-06-10

1986-04-01

Rosenbaum, Mark

Metal working

Method of mechanical manufacture

Electrical device making

29609, 310 42, 310216, A02K 1514

Patent

active

045788537

ABSTRACT:
To provide for precise alignment, with easy assembly of stacks of lamellae which form, for example, the armature of a dynamo electric machine, so that the winding slots will be aligned and the lamellae held together by frictional engagement and interlocking engagement of projections and recesses, the recesses are formed by a deformation process in which, first, holes are punched into the lamella elements at each location where the recesses--projections or bulges are to be placed, the holes being smaller than the recesses or projections and located centrally with respect thereto. The edge zones of the holes are then deformed so that the edge zones will have, along a diametrical line, at least approximately part V or roof shape, thereby forming corresponding projections at the other sides of the strip, the angle of the V or roof-shaped surfaces being about 120.degree.. The height of the projection is at least approximately equal to the thickness of any lamella, and the projection is defined by a ridge which extends radially with respect to the longitudinal axis of the opening from both sides of the opening to the outer surface of the projection.

REFERENCES:
patent: 2808616 (1957-10-01), Baldasarre et al.
patent: 2975312 (1961-03-01), Ploran
patent: 3202851 (1965-08-01), Zimmerle et al.

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