Stepping motor coil core and stator assembly for a timepiece

Details Stepping motor coil core and stator assembly for a timepiece Stepping motor coil core and stator assembly for a timepiece

1987-12-03

1989-01-03

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 43, 368157, 368160, H02K 3700, G04F 500

Patent

active

047959304

ABSTRACT:
In a wristwatch movement with a stepping motor with a rotor connected to drive a gear train which periodically advances the hands of the wristwatch, the stepping motor has a flat stator piece secured in a plastic movement frame. A coilcore assembly comprising a flat hook-shaped core plate having a straight core portion of uniform width with a coil inserted over the free hand of the core portion is secured to the stator so that opposite ends of the hook-shaped member overlap opposite ends the stator to complete a path for the magnetic flux. The hook-shaped coil core is placed on top of the stator during assembly and is held down by insulated clamping means such as a bridge or circuit board bolted to the frame at the time of final assembly. Preferably, the stator and coil core member are located with respect to one another by plastic studs integral with the frame extending through aligned holes in the stator and coil core. Some of the studs receive bolts which hold the clamping means to the frame.

REFERENCES:
patent: Re29403 (1977-09-01), Yamazaki
patent: 2909685 (1959-10-01), Szabo
patent: 4297838 (1981-11-01), Wanatabe
patent: 4361772 (1982-04-01), Fukushima
patent: 4398107 (1973-07-01), Fukushima
patent: 4636087 (1987-01-01), Suzuki
patent: 4647218 (1987-03-01), Wuthrich
patent: 4679944 (1987-07-01), Sedlak
patent: 4703208 (1987-10-01), Burkhardt et al.

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