US1985139A - Electrical synchronizing device - Google Patents

Electrical synchronizing device Download PDF

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Publication number
US1985139A
US1985139A US510815A US51081531A US1985139A US 1985139 A US1985139 A US 1985139A US 510815 A US510815 A US 510815A US 51081531 A US51081531 A US 51081531A US 1985139 A US1985139 A US 1985139A
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US
United States
Prior art keywords
tube
potential
circuit
motor
current
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 - Lifetime
Application number
US510815A
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English (en)
Inventor
Barthelemy Rene
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.)
Compteurs Schlumberger SA
Original Assignee
Compteurs Schlumberger SA
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 Compteurs Schlumberger SA filed Critical Compteurs Schlumberger SA
Application granted granted Critical
Publication of US1985139A publication Critical patent/US1985139A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
    • H04N5/123—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising whereby the synchronisation signal directly commands a frequency generator

Definitions

  • the oscillator is constituted by a lamp filled with neon or other gas and the operating characteristics of whichapproximate to those of a relaxation oscillator.
  • the present invention has reference to a method of accurately limiting the duration of the oscillation set up, or even if there be no oscillation, of destroying the electrical conditions which would be permanently established after the emission of the synchronizing top.
  • This method consists either in emitting a second top oi opposite effect to the first, or in the production of a local oscillation at the receiving end, controlled by the rotation of the motor to be synchronized and which brings the oscillator, the gas tube in the case in point, back to its initial state.
  • the invention is characterized by the arrangement and combination of parts hereinafter described.
  • Fig. 1 illustrates means for controlling the oscillations of the gas filled tube.
  • Fig. 2 illustrates a modification in which the oscillations are controlled by the rotation of the motor to be synchronized.
  • N is a neon tube to which is applied the voltage of the source U, the magnitude of such voltage lying between the lighting voltage and the extinguishing voltage of the tube.
  • a transformer T supplies a brief electromotive force in a suitable direction in the circuit of the tube. Said transformer will be generally fed by the current supplied by a receiving amplifier of high frequency waves not illustrated in the figure. Under the effect of the first signal emitted, the tube lights up and a current I flows through the res'istance'R, mounted in the tube circuit.
  • the oscillations of the potential RI across the resistance R are applied to the: winding W of the motor to "be'synchronized, generally through the medium of a suitable amplifier L on which a condenser C impresses the variations of potential RI set up at the ends of the resistance R by the current I discharged by the tube N.
  • a second signal of opposite sign is then emitted and produces in the transformer a short oscillation of contrary sign to the first and the tube is extinguished.
  • the current I stops flowing. It will thus. be understood that the duration of the. flow of the current I is determined solely by the signals with all the desired accuracy.
  • Fig. 2 illustrates a modification according to which the transformer T includes an additional winding T adapted to be fed with current from a source E in the circuit of which is included a commutator F mounted on the shaft of the motor to be synchronized W.
  • Matters are arranged so that when the signal for lighting up the tube N is emitted, the commutator opens the circuit of the winding T, so that no current flows through it.
  • the commutator F has been rotated into the position in which it closes the circuit of the winding T so that the transformer T applies to the tube a potential of contrary sign to that of the signal previously emitted and the tube N is consequently extinguished.
  • the commutator on the tube circuit may be direct or indirect (transformers inserted with suitable local sources, amplifiers etc. not shown).
  • a device for synchronizing an electric motor the combination with an electric motor of a gas-filled tube, an oscillator circuit in which said tube is mounted, said circuit feeding current to said electric motor, means for applying a potential of brief duration to said tube to light up said tube, and means controlled by the rotation of said motor for extinguishing said tube when said brief potential ceases to be applied thereto.
  • a device for synchronizing an electric motor the combination with an electric motor of a gas-filled tube, an oscillator circuit fed by said tube and feeding said electric motor, means for applying to said tube a potential of brief duration to light up said tube, means for applying to said tube a potential of contrary sign to said first potential to extinguish said tube, and means controlled by the rotation ofsaid motor for controlling the instant at which said second potential is applied to said tube.
  • a device for synchronizing an electric motor the combination with anelectric motor of a gas-filled tube, an oscillator circuit fed by said tube and feeding said electric motor, means, including a transformer, for applying to said tube a potential of brief duration to light up said tube, an additional winding on said transformer, a source of current for energizing said additional winding, and a commutator rotated by said motor and adapted periodically to close a circuit through said. additional winding whereby a potential of contrary sign is applied to said tube to extinguish same.
  • Apparatus for maintaining the rotation 01' a rotatable body in synchronism with received synchronizing impulses comprising means for driving said body, an electric arc discharge device responsive to the received impulses for controlling the movement of said driving means and means associated with said driving means for rendering it inoperative.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Toys (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Primary Cells (AREA)
  • Hybrid Cells (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
US510815A 1930-02-03 1931-01-23 Electrical synchronizing device Expired - Lifetime US1985139A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR705630T 1930-02-03

Publications (1)

Publication Number Publication Date
US1985139A true US1985139A (en) 1934-12-18

Family

ID=9067273

Family Applications (1)

Application Number Title Priority Date Filing Date
US510815A Expired - Lifetime US1985139A (en) 1930-02-03 1931-01-23 Electrical synchronizing device

Country Status (5)

Country Link
US (1) US1985139A (en(2012))
DE (1) DE636686C (en(2012))
FR (1) FR705630A (en(2012))
GB (1) GB356637A (en(2012))
NL (1) NL32457C (en(2012))

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE952274C (de) * 1939-05-27 1956-11-15 Fernseh Gmbh Synchronisierverfahren fuer Transformator-Kippgeraete

Also Published As

Publication number Publication date
NL32457C (en(2012))
GB356637A (en) 1931-09-10
FR705630A (fr) 1931-06-10
DE636686C (de) 1936-10-12

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