Energizing method for a single phase timepiece stepping motor

Details Energizing method for a single phase timepiece stepping motor Energizing method for a single phase timepiece stepping motor

1983-06-14

1985-09-17

Duggan, Donovan F.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 310 49R, 368157, H02K 3700

Patent

active

045423296

ABSTRACT:
An energizing method for a timepiece stepping motor provides just sufficient energy to the motor winding to assure a single step of the rotor with each driving pulse.
With each pulse the winding is initially energized at a constant voltage (period T.sub.1) then at a constant current (period T.sub.2) between two limits Imax and Imin. When the time period .DELTA.T.sub.3 required for the current to pass from Imax to Imin is greater than a reference time period .DELTA.T.sub.ref. the energization is terminated.
The invention may be employed in a wristwatch with the purpose of reducing energy consumption and increasing battery life.

REFERENCES:
patent: 3736487 (1973-05-01), Cook et al.
patent: 3760252 (1973-09-01), Beery
patent: 3965406 (1976-06-01), Yablonski
patent: 4081936 (1978-03-01), Leenhouts et al.
patent: 4346463 (1982-08-01), Tu Xuan et al.
10th International Congress of Chronometry, pp. 73-80, paper entitled Society de Recherches en Matiere de Micromoteurs Electriques, Sep. 11-14, 1979.

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