Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-01-25
1991-10-22
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 40MM, 310254, 310 43, 310 90, 368155, H02K 3700, G04C 500
Patent
active
050598406
ABSTRACT:
Briefly stated, the invention comprises an improved stepping motor and method of making it including locating it in the timepiece frame, the stepping motor including a rotor and a stator. A flat magnetizable stator member defines a central opening with diametrically opposed narrow sections on either side of the opening, a non-magnetic bushing disposed in the opening and secured to the surface of the stator member. The bushing has diametrically opposed cut-out portions aligned with the narrow sections. The narrow sections are severed to separate the stator into two pole shoes which are retained in position by the bushing. The severing is preferably by laser, but may includes sawing or other severing methods. The pole shoes of the stator member are then attached to the timepiece frame plate. The stepping motor rotor is journalled in bores formed in the frame and bushing.
REFERENCES:
patent: 3949251 (1976-04-01), Takatsuki
patent: 3978651 (1976-09-01), Yoshino
patent: 4270066 (1981-05-01), Terade et al.
patent: 4342930 (1982-08-01), Pellaton
patent: 4398107 (1983-08-01), Fukushima
patent: 4725749 (1988-02-01), Wuthrich
patent: 4912832 (1990-04-01), Egger et al.
Crutcher William C.
Skudy R.
Timex Corporation
To E.
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