Metal working – Method of mechanical manufacture – Electrical device making
Patent
1990-08-16
1991-05-21
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
72377, H02K 1502
Patent
active
050163400
ABSTRACT:
A method of manufacturing a magnetic rotor core member for a rotating-field dynamoelectric machine, particularly a small alternator, including the steps of hot forging a segment of steel bar stock into a core blank approximating the final volume desired for the rotor core member but with the pole piece finger angled outwardly from a central disc section at an angle of 45.degree. to 80.degree., the fingers being shorter than required for the finished pole pieces, de-burring the core blank and gradually cooling it. A shaft aperture is cold punched through the hub of the core blank, the pole piece fingers are bent into a vertical position relative to the rotor disc, and the pole piece fingers are ironed into close conformity with the required finished dimensions, in particular lengthening and shaping the fingers; this is all done in one step in a cold-forging press. The core blank is cold compressed to finished form as a rotor core member. Annealing is an optional step.
REFERENCES:
patent: 3271064 (1962-11-01), Priddy
patent: 4041754 (1977-08-01), Otani
patent: 4558511 (1985-12-01), Kato
patent: 4759117 (1988-07-01), Kato
Melvin H. Verson, "The Ford Sandusky Project", Nov. 2,3 and 4, 1965 pp. 8-10.
Hall Carl E.
Kato Iron Works, Ltd.
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