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An analog/hybrid computer simulation of phase-locked-loops in motor speed control

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Published:01 January 1974Publication History
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Abstract

This paper describes the simulation of the precise control of speed in servo systems using the digital phase-locked-loop (PLL) method and analog/hybrid computer techniques.

The PLL for motor speed control is essentially a hybrid feedback control system in which a reference square-wave signal is used to command servo velocity and position. The system consists of a phase comparator, a low-pass filter, the motor under control, and a voltage-controlled-oscillator (VCO) in the feedback path. The mathematical model of the motor and the low-pass filter are simulated on the analog computer. The input reference is a frequency-modulated (FM) digital signal. An integrated circuit is used as the phase comparator which compares the perturbed VCO feedback frequency and the input signal.

The method introduced here is simple to learn and practical to implement in undergraduate control courses. It introduces the student to the basic concepts of PLL control, without overwhelming him with its complex problems.

References

  1. 1 Synchronization Systems in Communication and Control, by William C. Lindsey, Prentice-Hall, Inc., 1972.Google ScholarGoogle Scholar
  2. 2 Phase-Locked and Frequency-Feedback Systems, by J. Klapper and J. T. Frankle, Academic Press, 1972.Google ScholarGoogle Scholar
  3. 3 Alan B. Grebene, "The Monolithic Phase-Locked Loop - A Versatile Building Block," pp. 38-49, IEEE Spectrum, March 1971.Google ScholarGoogle Scholar
  4. 4 A. W. Moore, "Phase-Locked Loops for Motor-Speed Control," pp. 61-67, IEEE Spectrum, April, 1973.Google ScholarGoogle Scholar

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  1. An analog/hybrid computer simulation of phase-locked-loops in motor speed control

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            • Published in

              cover image ACM SIGCSE Bulletin
              ACM SIGCSE Bulletin  Volume 6, Issue 1
              Proceedings of the 4th SIGCSE symposium on Computer science education
              February 1974
              195 pages
              ISSN:0097-8418
              DOI:10.1145/953057
              Issue’s Table of Contents
              • cover image ACM Conferences
                SIGCSE '74: Proceedings of the fourth SIGCSE technical symposium on Computer science education
                January 1974
                194 pages
                ISBN:9781450374835
                DOI:10.1145/800183

              Copyright © 1974 ACM

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              Association for Computing Machinery

              New York, NY, United States

              Publication History

              • Published: 1 January 1974

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