Low power stepping motor driver circuit and method

Details Low power stepping motor driver circuit and method Low power stepping motor driver circuit and method

1979-08-03

1981-07-07

Dobeck, B.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, G05B 1940

Patent

active

042777321

ABSTRACT:
A stepping motor driver system includes a switching system which sequentially selects windings of a stepper motor in a predetermined pattern to effect stepping of the rotor of the stepping motor from one "hold" position to the next. The stepping motor drive system sequentially connects a high supply voltage to each of the windings to achieve rapid current buildup in the selected windings and to maintain a predetermined average current in the selected windings. An input circuit responsive to a power control signal electrically disconnects the stepping motor windings from the power supply and electrically connects a low current holding current source to the windings so that a low holding current flows through the selected windings, maintaining a "holding" torque on the rotor at a predetermined stepping position thereof. Low power consumption, rapid frictional damping of mechanical oscillation of the rotor, and elimination of audio hum are thereby attained when the rotor is in a hold position.

REFERENCES:
patent: 3757193 (1973-09-01), Inaba et al.
patent: 3890554 (1975-06-01), Yoshitake et al.
patent: 3919608 (1975-11-01), Usami et al.

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