Method of making a rotor for electronic wristwatch step motor

Details Method of making a rotor for electronic wristwatch step motor Method of making a rotor for electronic wristwatch step motor

1975-11-24

1978-01-10

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

58 23R, 310 40MM, 310 42, 310156, 310261, H02K 1502

Patent

active

040671011

ABSTRACT:
A high performance rotor for an electronic wristwatch step motor and method of forming same is provided. A rotor pinion has a high performance permanent magnet rotor mounted thereto. The permanent magnet rotor includes a brittle permanent magnet core, and a reinforcing plate, the combination of the permanent magnet core and reinforcing plate allowing the high performance magnetic rotor to be interference fit upon the rotor pinion to effect an improved rotor construction.

REFERENCES:
patent: 3110675 (1963-11-01), Brailowsky
patent: 3141233 (1964-07-01), Schneider
patent: 3246187 (1966-04-01), Iemura
patent: 3671906 (1972-06-01), Hodges et al.
patent: 3777196 (1973-12-01), Field

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