Method for stamping stepper motor laminations

Details Method for stamping stepper motor laminations Method for stamping stepper motor laminations

1990-02-05

1991-09-03

Watts, Douglas D.

Cutting

Processes

Plural cutting steps

83 55, 29598, H02K 1502

Patent

active

050442376

ABSTRACT:
Metal parts requiring sharply-defined, accurate corners are formed in a two-step process. In the first step, first openings are made in a thin sheet of material, at least one edge of the first opening forming one edge of the desired sharply-defined corner. In the second step, a second opening is formed, wherein one edge of the second opening intersects the edge of the first opening at a predetermined angle. A sharp corner is formed at the intersection of these edges. In a preferred embodiment of the invention, the method is used as an improved method of forming single laminae and stacked laminae for stators and rotors of electric motors; in this embodiment a plurality of first openings are made in an annular array.

REFERENCES:
patent: 3107566 (1963-10-01), Archer
patent: 3460415 (1969-08-01), Philipp
patent: 3834013 (1974-09-01), Gerstle
patent: 4280275 (1981-07-01), Mitsui
patent: 4438558 (1984-03-01), Mitsui
patent: 4578853 (1986-04-01), Wurth
patent: 4619028 (1986-10-01), Neuenschwander
patent: 4809429 (1989-03-01), Martin

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