Method of and a device for controlling a stepping motor

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

1984-07-31

1985-11-05

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 368157, H02K 2904

Patent

active

045516650

ABSTRACT:
The method involves supplying to the motor drive pulses generated by a control circuit, determining by means of a measurement circuit a physical magnitude representative of the motion of the rotor, interrupting the drive pulse at a given instant defined by a calculating circuit according to the time taken by the physical magnitude to reach, in a comparator, a reference level, controlling by means of a missed step detecting circuit whether or not the rotor has effected a step, retrieving if need be a non-effected step, summing the number of missed or non-effected steps in a counting circuit, and modifying in a reference circuit the reference level depending on the number of steps that have been missed in a given period of time.
The device for putting this method into operation enables the motor to operate under optimal security and energy consumption conditions and can be used to advantage in timepieces.

REFERENCES:
patent: 4346463 (1982-08-01), Tu Xuan et al.
patent: 4353021 (1982-10-01), Watanabe et al.

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