Step motor particularly for electronic timepieces

Details Step motor particularly for electronic timepieces Step motor particularly for electronic timepieces

1984-01-20

1985-05-21

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310191, 310209, H02K 3700

Patent

active

045188840

ABSTRACT:
The invention relates to a step motor particularly for an electronic timepiece, comprising a stator whose two free ends constitute two pole pieces 4, 5, delimiting therebetween an air-gap 6 in which is accommodated the rotor 2. Each pole piece is provided with a recess 8 of cylindrical shape so that the axis of each cylinder is parallel with the axis of rotation Ar of the rotor 2. The two axes of the said cylinders are shifted from one another by a value comprised between 80.mu. and 200.mu. in a direction perpendicular to the plane P defined by the axis of rotation Ar of the rotor 2 and the main direction of the flux 13 generated by an exciting coil associated with the stator. The radii of the rotor 2 and the stator 3 are in the order of about 800.mu. and 1500.mu. respectively.

REFERENCES:
patent: 3969642 (1976-07-01), Yoshino
patent: 4066947 (1978-01-01), Nakajima et al.
patent: 4329601 (1982-05-01), Mai

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