EP0568751B1 - Vorrichtung zum Treiben von Uhrwerken - Google Patents

Vorrichtung zum Treiben von Uhrwerken Download PDF

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Publication number
EP0568751B1
EP0568751B1 EP92810324A EP92810324A EP0568751B1 EP 0568751 B1 EP0568751 B1 EP 0568751B1 EP 92810324 A EP92810324 A EP 92810324A EP 92810324 A EP92810324 A EP 92810324A EP 0568751 B1 EP0568751 B1 EP 0568751B1
Authority
EP
European Patent Office
Prior art keywords
motors
rotor
motor
rotation
torque
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
EP92810324A
Other languages
English (en)
French (fr)
Other versions
EP0568751A1 (de
Inventor
Mai Xuan Tu
Michel Schwab
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.)
Detra SA
Original Assignee
Detra 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 Detra SA filed Critical Detra SA
Priority to EP92810324A priority Critical patent/EP0568751B1/de
Priority to DE69201951T priority patent/DE69201951T2/de
Priority to US08/052,627 priority patent/US5400303A/en
Publication of EP0568751A1 publication Critical patent/EP0568751A1/de
Application granted granted Critical
Publication of EP0568751B1 publication Critical patent/EP0568751B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G04C3/14—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor
    • G04C3/146—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor incorporating two or more stepping motors or rotors

Definitions

  • the present invention relates to a drive device for timepieces for rotating the display hands in both directions.
  • French patent application No. 79 222 76 describes a two-phase stepper motor comprising a bipolar rotor and two coils arranged obliquely relative to an axis of symmetry, in order to subject the rotor to phase-shifted magnetic fields in space. While this motor offers safe operation in both directions of rotation, it has a relatively low efficiency.
  • the efficiency of a watch micromotor depends, on the one hand, on its coil volume, which is generally low due to construction requirements, and on the other hand, on the flux created by the magnet and coupled with the coil.
  • the arrangement of pole pieces in this engine implies a surface for the passage of the flux of the magnet limited to the thickness of the stator and over a sector of approximately 120 ° (FIG.
  • pole pieces 1a and 1b which has a reduction of approximately 120 ° / 180 °, that is 2/3 compared to the coupled flow in a single-phase motor of the same dimension.
  • this two-phase motor has a lower efficiency compared to a single-phase motor of the same dimension.
  • the object of the present invention is to remedy these drawbacks by providing a bidirectional drive device having a wide voltage operating range in both directions and a high energy efficiency.
  • FIG. 1 schematically shows a first embodiment of the drive device according to the invention.
  • the stepping motors 1 and 2 mesh the mobile 3. These motors are arranged so that at rest, in the absence of the currents in the coils 10 and 20, no torque is exerted on the rotors 11 and 21.
  • the teeth of the pinions 12 and 22 mounted on the rotors 11 and 21 are oriented at an angle ⁇ relative to the magnetic axis of the rotor magnets, as illustrated in FIG. 5
  • This orientation angle ⁇ depends on the number of teeth of the pinions and of the mobile 3, as well as on the relative position of the 2 rotors.
  • the angular positions of the rotors at rest are therefore determined only by the positioning notches 13a and 13b, respectively 23a and 23b located on the stator of the motors 1 and 2, as illustrated in FIGS. 2 and 3.
  • the axes passing through the positioning notches form with the horizontal axis of the mutual flux between the magnet and the coil the angles ⁇ 1 and ⁇ 2.
  • the asymmetrical positions of the magnets at rest give a preferential direction of rotation to each motor. In the example illustrated by Figures 2 and 3, the preferred direction of rotation of the motor 1 is clockwise and that of the motor 2 is counterclockwise. To control the rotation of the mobile 3 in one direction or the other, it suffices to supply either a motor or the other.
  • FIG. 6 represents the stator torque laws of the 2 motors as a function of the angle of rotation ⁇ .
  • curve 60 represents the positioning torque of each motor taken separately
  • curve 61 represents the resulting positioning torque
  • curve 62 the torque mutual developed by the motor 1
  • curve 63 the mutual torque developed by the motor 2.
  • the coil 10 is supplied which supplies the torque 62 to advance the rotor to vicinity of point I. From this moment, the supply of the coil 10 is interrupted and the coil 20 is supplied, since the torque 63 is greater than or equal to the torque 62 from this position.
  • FIG. 7 represents the voltage pulses at the terminals of the coils 10 and 20 as a function of time.
  • Figure 4 shows a second embodiment of the drive device according to the invention.
  • the motors 1 and 2 have a common branch 40 of the stator magnetic circuit, this embodiment making it possible to reduce the total size of the 2 motors. Practical tests have shown that the use of this common branch did not cause any harmful interaction at the level of magnetic fluxes and practically did not create saturation at the level of the magnetic circuit.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Stepping Motors (AREA)
  • Electromechanical Clocks (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Claims (3)

  1. Vorrichtung zum Treiben von Uhrwerken, mit zwei einphasigen Schrittmotoren (1, 2) die in einen Drehteil (3) eingreifen, wobei jeder Schrittmotor einen statorseitigen Magnetkreis, eine Spule (10, 20) und einen Rotor (11, 21) aus einem Permanentmagneten umfasst, dadurch gekennzeichnet, dass jeder Schrittmotor zum Abgeben einer Rotationsbewegung in einer bevorzugten Drehrichtung eingerichtet ist und dass die bevorzugten Drehrichtungen der beiden Schrittmotoren einander entgegengesetzt sind.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Schrittmotoren einen Schenkel (40) des statorseitigen Magnetkreises gemeinsam haben.
  3. Schrittmotor verwendet in der Vorrichtung gemäss den Ansprüchen 1 und 2, dadurch gekennzeichnet, dass die Verzahnung eines Ritzels (12, 22) des Rotors zur magnetischen Achse des Magneten des Rotors ausgerichtet ist.
EP92810324A 1992-05-04 1992-05-04 Vorrichtung zum Treiben von Uhrwerken Expired - Lifetime EP0568751B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP92810324A EP0568751B1 (de) 1992-05-04 1992-05-04 Vorrichtung zum Treiben von Uhrwerken
DE69201951T DE69201951T2 (de) 1992-05-04 1992-05-04 Vorrichtung zum Treiben von Uhrwerken.
US08/052,627 US5400303A (en) 1992-05-04 1993-04-27 Driving device for timepieces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92810324A EP0568751B1 (de) 1992-05-04 1992-05-04 Vorrichtung zum Treiben von Uhrwerken

Publications (2)

Publication Number Publication Date
EP0568751A1 EP0568751A1 (de) 1993-11-10
EP0568751B1 true EP0568751B1 (de) 1995-04-05

Family

ID=8211915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92810324A Expired - Lifetime EP0568751B1 (de) 1992-05-04 1992-05-04 Vorrichtung zum Treiben von Uhrwerken

Country Status (3)

Country Link
US (1) US5400303A (de)
EP (1) EP0568751B1 (de)
DE (1) DE69201951T2 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6285745B1 (en) 1994-12-05 2001-09-04 Bell Atlantic Network Services, Inc. Analog terminal internet access
FR2752496B1 (fr) * 1996-08-14 1998-10-23 Ebauchesfabrik Eta Ag Transducteur electromecanique comportant deux rotors a aimants permanents
CH690881A5 (fr) * 1996-12-04 2001-02-15 Ebauchesfabrik Eta Ag Transducteur électromécanique monophasé et dispositif électromécanique comprenant au moins un tel transducteur.
JP2001258227A (ja) * 2000-01-06 2001-09-21 Seiko Epson Corp 発電装置、それを有する計時装置および電子機器、発電装置のコギングトルク調整方法
US6932400B2 (en) * 2003-12-02 2005-08-23 Gwendolyn Gipson Desktop bible carrying case

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR940059A (fr) * 1947-01-09 1948-12-02 Lepaute Henry S Ets Réceptrice pour systèmes de distribution d'heure
JPS5280063A (en) * 1975-12-26 1977-07-05 Citizen Watch Co Ltd Reversible pulse motor system and watch
CH653521GA3 (de) * 1983-09-16 1986-01-15

Also Published As

Publication number Publication date
DE69201951T2 (de) 1995-12-21
US5400303A (en) 1995-03-21
DE69201951D1 (de) 1995-05-11
EP0568751A1 (de) 1993-11-10

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