Method and device for controlling a stepping motor of a timepiec

Details Method and device for controlling a stepping motor of a timepiec Method and device for controlling a stepping motor of a timepiec

1982-09-29

1984-08-21

Rubinson, G. Z.

Electricity: motive power systems

Open-loop stepping motor control systems

368157, H02K 2902

Patent

active

044672560

ABSTRACT:
The present invention concerns a method and a device for controlling a stepping motor of a timepiece, which permit the power of each drive pulse to be adapted to the value of the electromotive force (V) and/or the internal resistance (R*) of the power supply source (10).
In accordance with the invention, at a given moment, a value of a chopping rate (Ha) is determined in dependence on the value of the electromotive force V and/or the internal resistance R* of the power supply source (10), said value being stored, and the chopping rate of each control pulse being adjusted to the stored value.
The control device comprises means (13) for supplying a chopping signal (M) to a drive circuit (12) of the motor (11). The chopping rate is determined by information contained in a memory (14). The stored information is periodically corrected in dependence on the value of the electromotive force (V) and/or the internal resistance (R*) of the power supply source (10).

REFERENCES:
patent: 3812413 (1983-05-01), Keidl
patent: 4216648 (1980-08-01), Maire
Crider, C. H. & Frankeny, R. F., "Current Tracking Chopper Motor Driver", IBM Technical Disclosure Bulletin, vol. 23, No. 4, Sep. 1980, pp. 1303-1304.

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