US3176171A - Electromagnetic oscillatory drive - Google Patents

Electromagnetic oscillatory drive Download PDF

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Publication number
US3176171A
US3176171A US178711A US17871162A US3176171A US 3176171 A US3176171 A US 3176171A US 178711 A US178711 A US 178711A US 17871162 A US17871162 A US 17871162A US 3176171 A US3176171 A US 3176171A
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United States
Prior art keywords
legs
winding
gap
bar
armature
Prior art date
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Expired - Lifetime
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US178711A
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English (en)
Inventor
Baumgartner Werner Richard
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.)
Centre Suisse dElectronique et Microtechnique SA CSEM
Original Assignee
Suisse De Rech S Horlogeres La
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/08—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically
    • G04C3/10—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by electromagnetic means
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/08—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically
    • G04C3/10—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by electromagnetic means
    • G04C3/101—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by electromagnetic means constructional details
    • G04C3/107—Controlling frequency or amplitude of the oscillating system

Definitions

  • My invention has for its object a novel arrangement of said type, the novelty of which consists in that the control and driving windings are carried by the same ferromagnetic armature the ends of which are spaced by a very narrow gap and face one of the poles of a magnetic system. This pole oscillates in front of the gap, either the armature or the magnetic system being rigid with the oscillator.
  • FIG. 1 is a general plan view of the oscillator and time-piece mechanism
  • FIGS. 2 and 3 are cross-sectional views taken on lines IIII and IIIIII respectively of FIG. 1,
  • FIG. 4 is a wiring diagram and FIG. 5 is a graph showing the voltages induced in the windings illustrated in FIG. 4.
  • the electronic wiring diagram FIG. 4, of the time-piece illustrated includes a supply of current 1 constituted by a voltaic battery or a storage battery.
  • a transistor 2 including in its control circuit an R-C circuit and a control winding 3 and in its power circuit a driving winding 4 are connected to the battery.
  • These two windings are carried by an armature 5 (FIG. 3) of which two ends 5a and 5b form between them a very narrow gap 6 of a magnitude of about 0.1 mm.
  • the armature may be made of ferrite or of the alloy sold under the trademark Permalloy for instance. In the latter case, it is constituted by superposed sheets insulated with reference to one another so as to reduce the eddy currents.
  • a magnetic system 7 is adapted to oscillate in front of the gap 6 separating it from the armature 5 under the action of a torsion oscillator carrying the system as hereafter described.
  • the oscillator comprises a torsion spring 8 having a V-shaped cross-section and fitted at both ends in the time-piece plate.
  • the torsion spring carries a transverse arm 9 to one end of which the magnetic system 7 is secured while its other end carries a catch mechanism which is not illustrated.
  • the catch mechanism drives a ratchet wheel 10 rigid with a worm 11 which drives in its turn the watch mechanism which includes an intermediate gear 12, an eccentric seconds gear 13, a third gear 14 and lastly a center gear 15.
  • the motion work controlling the hour hand is not illustrated.
  • the magnetic system 7 is constituted by a rectilinear magnetized bar 16 fitted inside a mild U-shaped ferromagnetic member 17 the arms of which extend to either side of the bar a short distance from the corresponding surfaces of the latter.
  • the space between the bar and member may be filled with air or the like non-magnetic 3,176,171 Patented Mar. 30, 1965 material and should be designed so as to provide an optimum magnetic energy in proximity with the ends 5a and 5b of the armature for a predetermined magnetic system.
  • the member 17 reduces to a maximum the outer field produced by the magnet and cuts out therefor the major part of the losses produced by eddy currents. When in operation the oscillating magnetized bar first moves towards the end 5:!
  • the magnetized bar is restored by the spring towards the opposite end 5b of the armature and at the moment at which the bar faces the gap 6, that is when the oscillating system is in its inoperative position or condition, the transistor which has been rendered conductive by the control voltage pulse applied by the control winding 3 allows a driving pulse Vm to pass through the driving winding 4.
  • the flux produced provides an acceleration of the bar towards the end 5b.
  • the impulse may be given slightly ahead of this inoperative position so as to correct the possible error isochronism ascribable to the holding fast in position of the ends of the spring 8.
  • the oscillating mechanism produces pulses alternately in the control winding 3 and driving winding 4.
  • the control pulses in the control winding have a voltage Vi value in the order of 0.4 millivolt and are applied spaced about twenty milliseconds, shown or the abscissa of the graph, apart from the drive voltage, Vm, pulses produced in the driving winding which have about twice the peak value of the control pulses in the control winding since these pulses must work against the force of the torsion spring 8.
  • the alternate control and driving pulses maintain the oscillations of the system and are in turn induced by the oscillations once the oscillations are started.
  • the adjustment of operation is obtained through a shifting of the magnetic system towards and away from the gap in the armature. This is accomplished by adjusting the axial position of the armature 5 with an adjusting screw 20 having one end anchored in the armature and passing through a threaded hole in a mount 21.
  • An oscillatory motor for controlling an electronic time-piece comprising, an electronic circuit for energizing said motor including a driving winding and a control winding, a U-shaped ferromagnetic core including two legs carrying respectively said driving winding and said control winding, the free terminal surfaces of which are separated by a very narrow gap of about 0.1 mm., at a small distance therefrom, a magnet bar, the longitudinal axis of said bar extending perpendicularly to the terminal surfaces of the core legs and passing normally through the middle of said gap to oscillate in front of the gap under the action of the cooperating electronic circuit, and a U-shaped armature including two legs extending symmetrically to either side of said magnet bar, in par- 3 allelisrn therewith in the plane including the longitudinal axes of the core legs.
  • An oscillatory motor for controlling an electronic time-piece comprising, an electronic circuit energizing said motor including a driving winding and a control winding, comprising a U-shaped ferromagnetic core including two legs carrying respectively said driving winding and said control winding, the free terminal surfaces of which are separated by a very narrow gap of about 0.1 mm., a magnet bar one end of which faces said free terminal surfaces at a small distance therefrom, the axis of said bar extending perpendicularly to the terminal surfaces of the core legs and passing normally through the middle of said gap to oscillate in front of the gap under the action of the cooperating electronic circuit, a U-shaped armature stationary with reference to the core, including two legs extending symmetrically to either side of said magnet bar, in parallelism therewith in the plane including the longitudinal axes of the core legs, and means for adjusting the distance between the end of the magnet bar facing the gap and the terminal surfaces of the core legs.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
US178711A 1961-03-14 1962-03-09 Electromagnetic oscillatory drive Expired - Lifetime US3176171A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH308361A CH371057A (fr) 1961-03-14 1961-03-14 Pièce d'horlogerie électronique

Publications (1)

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US3176171A true US3176171A (en) 1965-03-30

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US178711A Expired - Lifetime US3176171A (en) 1961-03-14 1962-03-09 Electromagnetic oscillatory drive

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CH (2) CH308361A4 (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3277643A (en) * 1961-05-24 1966-10-11 Favre Robert Electronic watch
US3432696A (en) * 1967-05-18 1969-03-11 Gen Electric Torsion wire tension spring for a battery-operated clock
US3454799A (en) * 1966-01-21 1969-07-08 Gen Electric Torsion wire tension spring for battery operated clock
US3594621A (en) * 1968-11-23 1971-07-20 Kienzle Uhrenfabriken Gmbh Control system for oscillatory movements

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1541138A (en) * 1922-03-15 1925-06-09 Harje August Bengtsson Electric clock
US2079421A (en) * 1934-08-29 1937-05-04 Ingraham E Co Vibratory synchronous electric motor
US2831114A (en) * 1954-11-25 1958-04-15 Philips Corp Transistor amplifier with bias stabilization
US2843742A (en) * 1954-11-06 1958-07-15 Philips Corp Device for maintaining mechanical oscillations
US2960817A (en) * 1955-05-12 1960-11-22 Bulova Watch Co Inc Electrical timepiece

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1541138A (en) * 1922-03-15 1925-06-09 Harje August Bengtsson Electric clock
US2079421A (en) * 1934-08-29 1937-05-04 Ingraham E Co Vibratory synchronous electric motor
US2843742A (en) * 1954-11-06 1958-07-15 Philips Corp Device for maintaining mechanical oscillations
US2831114A (en) * 1954-11-25 1958-04-15 Philips Corp Transistor amplifier with bias stabilization
US2960817A (en) * 1955-05-12 1960-11-22 Bulova Watch Co Inc Electrical timepiece

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3277643A (en) * 1961-05-24 1966-10-11 Favre Robert Electronic watch
US3454799A (en) * 1966-01-21 1969-07-08 Gen Electric Torsion wire tension spring for battery operated clock
US3432696A (en) * 1967-05-18 1969-03-11 Gen Electric Torsion wire tension spring for a battery-operated clock
US3594621A (en) * 1968-11-23 1971-07-20 Kienzle Uhrenfabriken Gmbh Control system for oscillatory movements

Also Published As

Publication number Publication date
CH371057A (fr) 1963-04-11
CH308361A4 (xx) 1963-04-11

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