Miniature motor for an electronic timepiece including a stator h

Details Miniature motor for an electronic timepiece including a stator h Miniature motor for an electronic timepiece including a stator h

1979-01-08

1981-05-26

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 40MM, 310 91, 310218, H02K 112

Patent

active

042700663

ABSTRACT:
In an electronic timepiece motor, a one-piece stator of magnetic material having a hole therethrough bounded by a circumferential sidewall and defining a pair of stator portions connected by narrow bridges having small cross sections. The narrow bridges define a magnetic circuit of high magnetic resistance between the stator portions. A non-magnetic reinforcing ring is disposed within the hole through the one-piece stator and has an outer diameter effective to insure a snug fit of the reinforcing ring with the circumferential sidewall defining the hole through the stator. The reinforcing ring imparts stiffness to the one-piece stator to prevent deformation of the bridges and the hole. The reinforcing ring has a peripheral reinforcing flange extending outwardly and with the flange bearing against the one-piece stator adjacent the hole therethrough for imparting additional stiffness to the one-piece stator. A rotor is mounted for rotation within the hole through the one-piece stator and within the reinforcing ring.

REFERENCES:
patent: 3256453 (1966-06-01), Hydon
patent: 3949251 (1976-04-01), Takatsuki
patent: 3978651 (1976-09-01), Yoshino
patent: 3979616 (1976-09-01), Stechmann
patent: 4041336 (1977-08-01), Sudler

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