• W. F. Stoecker
  • P. A. Stoecker


After the controlled variables have been sensed, transduced, and converted to digital signals, the microcomputer makes decisions on what action should be taken based on the user-supplied program. Ultimately a switch will be turned on or off or the position of a valve, damper, variable-speed motor drive, or other modulating regulator will be changed. This chapter concentrates on these “actuators” which exist at the extremity of the control system.


Step Motor Line Current Gate Current Computer Control System Rotor Tooth 


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  1. 1.
    H. V. Malmstadt, C. G. Enke, and S. R. Crouch, Electronic Measurement for Scientists, W. A. Benjamin, Menlo Park, CA, 1974.Google Scholar
  2. 2.
    P. Giacomo, “A Stepping Motor Primer,” Byte, vol. 4, no. 2, pp. 90–105, February 1979, and vol. 4, no. 3, pp. 142-149, March 1979.Google Scholar
  3. 3.
    B. C. Kuo, Theory and Application of Step Motors, West Publishing Company, St. Paul, MN, 1974.Google Scholar
  4. 4.
    Application Data, AIRPAX/North American Philips Controls Corporation, Cheshire, CT, 1980.Google Scholar

Copyright information

© Van Nostrand Reinhold 1989

Authors and Affiliations

  • W. F. Stoecker
    • 1
  • P. A. Stoecker
    • 2
  1. 1.University of IllinoisUrbana-ChampaignUSA
  2. 2.Hewlett-Packard CompanyUSA

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