Method of manufacturing laminated core for dynamo-electric machi

Details Method of manufacturing laminated core for dynamo-electric machi Method of manufacturing laminated core for dynamo-electric machi

1992-09-30

1993-10-26

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

29609, 310 42, 310216, H02K 1502

Patent

active

052554252

ABSTRACT:
A method of manufacturing a laminated core for a dynamo-electric machine, having a shaft and a plurality of core sheets with through holes in the center thereof for inserting the shaft therethrough and a plurality of slot holes in the peripheral portion thereof. In the same method, there is provided a construction in which the core sheet is punched so that at least a part of scrap sections to be punched and then removed, including the through hole and the slot holes, is formed as a half die-cut portion, the half die-cut portion formed on the core sheet being fitted to another adjacent core sheet. After the plurality of core sheets are laminated together, the shaft is forced through the through holes and at the same time the half die-cut portions are removed. Therefore, an integration of core sheets is obtained after die-cutting, thereby resulting in easier handling. Further, since the resulting laminated core does not have any joint portion between each of the core sheets, eddy current is reduced and rotation efficiency is improved.

REFERENCES:
patent: 3203077 (1965-08-01), Zimmerle
patent: 3210824 (1965-10-01), Zimmerle
patent: 4333353 (1989-05-01), Hansen
patent: 4597168 (1986-07-01), Oboshi et al.
patent: 4738020 (1988-04-01), Neuenschwander

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