Stepper motor control apparatus

Details Stepper motor control apparatus Stepper motor control apparatus

1975-09-22

1977-08-16

Schaefer, Robert K.

Electricity: motive power systems

Positional servo systems

With stabilizing features

318620, 318685, G05B 501

Patent

active

040428680

ABSTRACT:
A control system using a duty cycle converter to convert an analog input into both a second order or velocity squared feedback as well as a set of clockwise and counterclockwise pulse trains the frequency of which is dependent upon the amplitude of the input signal. The velocity squared feedback is augmented by a position feedback from a stepper motor to provide optimum operation. To obtain optimum performance from a stepper motor, the rate of change of input pulses must not exceed a predetermined value for starting or stopping or the motor will react improperly to some of the pulses. The present system provides a linear increase in the step rate to a maximum and then a linear decrease in the step rate such that there is no overshoot beyond the requested analog input signal.

REFERENCES:
patent: 3241015 (1966-03-01), Allen
patent: 3273035 (1966-09-01), Inderhees
patent: 3412300 (1968-11-01), Westenskow
patent: 3448362 (1969-06-01), Dorf et al.
patent: 3777122 (1973-12-01), Borsboom
patent: 3805137 (1974-04-01), Fahrner

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