Positioning method and apparatus therefor

Details Positioning method and apparatus therefor Positioning method and apparatus therefor

1987-06-22

1988-10-04

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02P 800

Patent

active

047758252

ABSTRACT:
A method and apparatus for moving a moving member of a positioning mechanism to a target position by means of a stepper motor as a driver. The method and apparatus alleviate the positioning error attributable to the hysteresis of the stepper motor, which is inherent in stepper motor drive systems, by controlling the oscillation damping condition when the stepper motor has entered a damped oscillation phase in the vicinity to the target positon. The damping condition is controlled by varying the solid friction factor of the mechanism or the drawback torque constant of the stepper motor.

REFERENCES:
patent: 3586953 (1971-06-01), Markkanen
patent: 3760252 (1973-09-01), Beery
patent: 4496892 (1985-01-01), Bugatto, Sr.

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