Method and device for controlling a stepping motor

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

1983-09-29

1985-03-26

Witkowski, S. J.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02K 2904

Patent

active

045075999

ABSTRACT:
The rotor of a stepping motor may remain blocked in an intermediate position different from a rest position if its control circuit adjusts the electric energy of the driving pulses to the minimum corresponding to the actual mechanical load of the motor determined by a measuring circuit. To remove this risk, the method consists in producing with the aid of a generator and applying to the motor, pulses which allow release of the rotor when it has remained blocked in an intermediate position in response to a driving pulse. The release pulses are distinct from any correction pulses which are applied in known manner to make up a lost step. The release pulses precede the correction pulses and are preferably of such polarity as to return the rotor to its starting position to ensure correct action of the ensuing correction pulses.
This method applies in particular to the control of the stepping motor of an electronic timepiece.

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