GB839126A - Improvements in or relating to digital-analog servo circuit - Google Patents

Improvements in or relating to digital-analog servo circuit

Info

Publication number
GB839126A
GB839126A GB32241/56A GB3224156A GB839126A GB 839126 A GB839126 A GB 839126A GB 32241/56 A GB32241/56 A GB 32241/56A GB 3224156 A GB3224156 A GB 3224156A GB 839126 A GB839126 A GB 839126A
Authority
GB
United Kingdom
Prior art keywords
signal
outputs
analogue
tape
digital
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB32241/56A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
North American Aviation Corp
Original Assignee
North American Aviation Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by North American Aviation Corp filed Critical North American Aviation Corp
Publication of GB839126A publication Critical patent/GB839126A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
    • G05B19/39—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path using a combination of the means covered by at least two of the preceding groups G05B19/21, G05B19/27 and G05B19/33

Landscapes

  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

839,126. Programmed electric control systems. NORTH AMERICAN AVIATION Inc. Oct. 23, 1956 [Dec. 23, 1955], No. 32241/56. Class 40 (1). In a servomotor. circuit wherein control is effected by a digital error signal resulting from a comparison of a programmed digital input signal and a corresponding signal derived from a magnetic tape or other record driven by the motor, the digital error signal is first converted into analogue form and then combined with a fine control analogue signal derived from the tape pick-off. As shown, the servomotor M, Fig. 1, drives. through a fluid pressure system 89-41, a magnetic tape 3 on which is recorded a sine wave. Pick-off 1, 2 are disposed an odd number of quarter-wavelengths apart. Their outputs, after amplification and demodulation at 5, 6, are fed to respective flip-flops 7, 8 the outputs of which are combined in. a direction circuit 9 to produce a " distance " pulse over line 10 for each quarter wavelength traversed by the tape relative to the pick-offs, and associated " direction " pulses over line 11 corresponding to the direction of the relative movement of the tape. These pulses are compared in a reversible error counter 12 with the programmed distance and direction input pulses from a director 82. The resultant digital error (difference) signal is converted into analogue form at 13 (e.g. by summing resistors 14-17 in the case of a binary counter) and fed via an amplifier 39 to drive the motor M in the corrective sense. For fine control, Figs. 1, 7, push-pull sinusoidal outputs ΠA, ΠB taken from the demodulators 5, 6 are added algebraically in selected combinations. This is effected by gating the outputs ΠA, ΠB by diodes 66-69 according to the outputs of the flip flops 7, 8, to mechanize four logical equations as disclosed in the Specification, whereby the required analogue fine control voltage is fed over resistor 27 and added to the coarse error analogue step signal to provide a continuously varying control signal.
GB32241/56A 1955-12-23 1956-10-23 Improvements in or relating to digital-analog servo circuit Expired GB839126A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US839126XA 1955-12-23 1955-12-23

Publications (1)

Publication Number Publication Date
GB839126A true GB839126A (en) 1960-06-29

Family

ID=22181466

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32241/56A Expired GB839126A (en) 1955-12-23 1956-10-23 Improvements in or relating to digital-analog servo circuit

Country Status (1)

Country Link
GB (1) GB839126A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0051453A1 (en) * 1980-10-30 1982-05-12 Fanuc Ltd. Spindle orientation control apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0051453A1 (en) * 1980-10-30 1982-05-12 Fanuc Ltd. Spindle orientation control apparatus

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