Stepping motor control

Details Stepping motor control Stepping motor control

1977-08-29

1979-01-23

Hohauser, Herman J.

Electricity: motive power systems

Open-loop stepping motor control systems

318138, G05B 1940

Patent

active

041363086

ABSTRACT:
A control circuit for operating a stepping motor from a DC power source by switching current successively through four stator windings. Switching time in relation to shaft position is controlled by sensing the back EMF in the stator coils, the sensing circuit including a transformer having a first winding connected in series with two windings and the second winding connected in series with the other two windings of the stator. The voltages across the two windings at the transformer are used to generate a commutation pulse each time the voltages are equal. Each commutation pulse is generated in this manner at predetermined angular positions (phase) of the stepping motor independently of motor speed or supply voltage. The commutation pulses are then used to generate clock pulses for sequencing the switching of the stator windings.

REFERENCES:
patent: 3304481 (1967-02-01), Saussele

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