Timepiece with a device for the control of a stepping motor

Details Timepiece with a device for the control of a stepping motor Timepiece with a device for the control of a stepping motor

1981-02-10

1984-01-10

Truhe, J. V.

Electricity: motive power systems

Open-loop stepping motor control systems

368157, G04F 500

Patent

active

044255381

ABSTRACT:
The timepiece includes a detector of the direction of the current in the winding of the motor which is used to detect the first reversal in current direction after the end of the driving pulse and to deliver a signal which is representative of this current direction. A comparator circuit (34-36, 38, 39, 48) is used to compare the moment of the appearance of this signal with a reference time which is fixed in relation to the driving pulse and to control a circuit (28-31, 33, 40, 44, 51, 46, 47) which controls the duration of the driving pulses in such a way that the instant at which the signal appears coincides with the reference time. This enables minimum energy to be imparted to the motor for a given variable load.

REFERENCES:
patent: 4208868 (1980-06-01), Regnier et al.

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