Phase-locked step motor speed servo controller

Details Phase-locked step motor speed servo controller Phase-locked step motor speed servo controller

1992-03-17

1993-05-18

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

318608, 318696, 388805, 388911, 388912, G05B 1106

Patent

active

052124347

ABSTRACT:
A speed controller is equipped to a step motor for controlling the rotation of the step motor with a desired angular velocity. The step motor speed controller utilizes a phase-locked stepping servomechanism (PLSS) in which a phase-controlled oscillator (PCO) comprised of an adaptive digital-pumped controller (ADPC) and a voltage-controller oscillator (VCO) is employed. The step motor speed controller utilizes a tachometer comprised of an optical encoder for detecting the angular speed of the step motor. The tachometer sends out a first pulse train with the frequency thereof indicating the angular velocity of the step motor as a feedback signal to the ADPC. A reference signal source is employed for sending a second pulse train to the ADPC. The ADPC compares the phase difference between the first pulse train and the second pulse train and whereby a signal corresponding the phase difference is sent to the VCO, causing the VCO to output a third pulse train to the step motor. The generated third pulse is thus used to drive the step motor.

REFERENCES:
patent: 3626267 (1971-12-01), Bobbitt
patent: 3686469 (1972-08-01), Clark et al.
patent: 3828168 (1974-08-01), O'Callaghan et al.
IEEE Transactions on Industrial Electronics, "PLL Speed Regulation of Fractional Horsepower Series and Universal Motors", vol. IE-31, No. 3, Aug. 1984, pp. 277-281.

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