EP0131760B1 - Dispositif de commande de deux moteurs pas-à-pas bidirectionnels - Google Patents

Dispositif de commande de deux moteurs pas-à-pas bidirectionnels Download PDF

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Publication number
EP0131760B1
EP0131760B1 EP84106787A EP84106787A EP0131760B1 EP 0131760 B1 EP0131760 B1 EP 0131760B1 EP 84106787 A EP84106787 A EP 84106787A EP 84106787 A EP84106787 A EP 84106787A EP 0131760 B1 EP0131760 B1 EP 0131760B1
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EP
European Patent Office
Prior art keywords
transistors
coils
motors
circuit
branches
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
EP84106787A
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German (de)
English (en)
French (fr)
Other versions
EP0131760A1 (fr
Inventor
René Besson
Yves Guerin
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.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
Eta SA Fabriques dEbauches
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Publication of EP0131760A1 publication Critical patent/EP0131760A1/fr
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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
    • G04C3/14—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 device for controlling two bidirectional stepping motors of an electronic timepiece, which each have two coils.
  • This device can be used in particular in an analog watch.
  • watches are known in which a first motor actuates a second hand and a minute hand while a second motor drives an hour hand and a date indicator.
  • a first motor actuates a second hand and a minute hand while a second motor drives an hour hand and a date indicator.
  • Another possibility is to use a stepping motor specially designed to rotate in both directions and in particular a motor with two coils.
  • the motor control circuit must therefore necessarily comprise eight power transistors conventionally forming two bridges of four transistors, into which the two coils are connected respectively. For a watch with two motors this number of transistors should normally be multiplied by two. This is a drawback because it is well known that, unlike the logic circuits which control them, the power transistors occupy a large area on the wafer of the integrated circuit of the watch.
  • motors whose coils are energized alternately is, in this respect, more advantageous because, as indicated in Swiss patent no. 632 128 or in application WOA8 101 205, it is then possible to provide only six transistors to supply the two coils of a motor.
  • the number of integrated circuit output terminals reserved for supplying the coils can be reduced to three per motor instead of four.
  • the object of the present invention is to provide a control device for two stepping motors. bidirectional with two coils making it possible to simultaneously supply the two coils of the same motor with a reduced number of power transistors and to limit the number of terminals of the circuit in which these transistors are integrated with the electronic components which serve to control them.
  • control device comprises two driving circuits Ci and C 2 each comprising three branches connected in parallel between two supply terminals b 1 and b 2 which are respectively connected to the positive pole and at the negative pole of an electrical energy source P, for example a battery.
  • Each of the six branches is formed of two complementary MOS field effect transistors connected in series, the drains of these transistors being connected together and their respective sources connected to the supply terminals b 1 and b 2 .
  • the P channel transistors bear the references T 11 , T, 3 , T 15 for the first driving circuit Ci and T 21 , T 23 , T 25 for the second circuit C 2 .
  • the N channel transistors are designated by T 12 , T 14 and T 16 , on the one hand, and by T 22 , T 24 and T 26 , on the other hand.
  • a first coil B 11 of one of the stepping motors to be controlled is connected between the connection point of the drains of the transistors T 11 and T 12 and that of the drains of the transistors T 15 and T 16
  • a first coil B 21 of the second motor is connected between the junction point of the drains of the transistors T 15 and T, 6 and that of the drains of the transistors T, 3 and T 14
  • the second coils B 12 and B 22 of the two motors are connected, on the one hand, both at the connection point between the transistors T 25 and T 26 and, on the other hand, respectively at the junctions between the transistors T 21 and T 22 and between the transistors T 23 and T 24 .
  • the motors to which the four coils B 11 , B 12 , B 21 and B 22 belong have not been shown in the drawing because they may in fact be any kind of bidirectional motors usable in a room.
  • timepieces whose two coils can or must be supplied simultaneously and for which the direction of the current must be reversed at least once in one at least of the coils during the duration of the driving pulses.
  • the two engines may be different.
  • the gates of the transistors T 11 to T 16 and T 21 to T 26 receive from a control circuit not shown in FIG. 1 but of which an example will be given later, control signals of duration and polarity defined so as to block or make the desired transistors conductive so that each of the motors rotates at the desired frequency and in the desired direction, while preventing the two motors from operating simultaneously.
  • the control circuit To make the transistors T 11 , T 13 , T 15 , T 21 , T 23 and T 25 conductive, the control circuit must apply to the gate of each of these a logic signal "0". On the contrary, a logic signal "1" will block them. On the other hand, the control circuit must apply to the gates of the transistors T, 2 , T 14 , T 16 , T 22 , T 24 and T 26 a logic signal "0" to block these transistors and a logic signal "1" to make them conductive.
  • a logic signal "0" and respectively “1” means a signal having the same voltage as the negative pole, respectively positive, of the energy source P.
  • the control circuit must make the transistors T 12 and T 15 , respectively T 22 and T, conductive. 25 .
  • the control circuit must make the transistors T 11 and T 16 , T 21 and T 26 respectively .
  • control circuit must make the two N-channel transistors or the two P-channel transistors conductive, to the drains to which the coil to be short-circuited is directly connected.
  • the device which has just been described therefore makes it possible to simultaneously control the coils of each of the motors in the same way as if the four coils were each connected in a bridge of four transistors, but using only twelve power transistors which occupy all substantially the same area on the integrated circuit and saving two output terminals for this circuit.
  • FIG. 2 shows the shape of the current pulses that the driving circuits C, and C 2 of FIG. 1 are caused to apply to the coils B 11 , B 12 , B 21 and 8 22 when it acts to control two motors such as that described in the German patent application No. 3,026,004 cited above and which rotates in 180 ° steps.
  • This diagram takes into account the choice which is made in this patent application for the positive and negative directions of the currents in the coils.
  • Part a of FIG. 2 corresponds to the case where the motors both rotate in the same direction, for example in forward gear, while part b corresponds to the case where the motors both operate in reverse gear. Of course, this does not exclude the possibility of turning one of the motors in forward gear while the other operates in reverse.
  • a new step will be taken in the same direction when the second coils receive positive currents and the second coils first positive, then negative currents.
  • the driving pulses applied to the two motors have been represented as having the same frequency and the same duration. It is clear that this will not always be the case.
  • the first motor will receive driving impulses every second and the second only every five minutes if the hour hand is driven at twelve steps per hour.
  • the duration of the pulses will be longer for the second motor than for the first, since this second motor will have to drive a calendar mechanism.
  • FIG. 3 schematically represents an example of a control circuit which can be used in a watch, with the drive circuits of FIG. 1, to control two motors similar to that of the aforementioned German patent application.
  • control signals of the transistors T 11 to T 16 and T 21 to T 26 are supplied by a memory 4, of ROM type, which has six outputs, Si to S 6 , which are directly connected to the gates of the transistors T 11 to T 16 of the first driver C, and six other outputs, S 7 to S 12 , which are also directly connected to the gates of the transistors T 21 , to T 26 of the second driver C 2 .
  • This memory also includes four address inputs, E, to E4, intended to receive logic signals, each combination of which corresponds to a blocking, short-circuiting or positive or negative current flow state in the different coils. B 11 , B 12 , B 21 , and B 22 .
  • the control circuit also includes an oscillator 1 including a quartz resonator and its maintenance circuit, a frequency divider 2 and a control logic 3 which develops, from signals of different frequencies delivered by the divider and from produced signals. by control means not shown, the logic signals which must be applied to the inputs of the read-only memory 4.
  • an oscillator 1 including a quartz resonator and its maintenance circuit
  • a frequency divider 2 and a control logic 3 which develops, from signals of different frequencies delivered by the divider and from produced signals. by control means not shown, the logic signals which must be applied to the inputs of the read-only memory 4.
  • Oscillator 1 and divider 2 are conventional.
  • control logic it will not be described in detail since its diagram depends on the function which is assigned to each of the motors and the automatic or manual means which are provided for controlling them.
  • the table below summarizes the operation of the circuit in the simple case where, firstly, the two coils of each motor are short-circuited for a determined time after the application of driving pulses to this motor and where secondly, the coils of one of the motors is supplied and then short-circuited only when the coils of the other motor are out of service, that is to say neither supplied with current nor short-circuited.
  • the four columns entitled "INPUTS" give an example of the combinations of four logic signals which are applied to the inputs E 1 to E4 of the memory 4.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Stepping Motors (AREA)
  • Electromechanical Clocks (AREA)
EP84106787A 1983-06-29 1984-06-14 Dispositif de commande de deux moteurs pas-à-pas bidirectionnels Expired EP0131760B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3548/83 1983-06-29
CH354883A CH650125GA3 (xx) 1983-06-29 1983-06-29

Publications (2)

Publication Number Publication Date
EP0131760A1 EP0131760A1 (fr) 1985-01-23
EP0131760B1 true EP0131760B1 (fr) 1988-08-31

Family

ID=4258357

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106787A Expired EP0131760B1 (fr) 1983-06-29 1984-06-14 Dispositif de commande de deux moteurs pas-à-pas bidirectionnels

Country Status (6)

Country Link
US (1) US4558268A (xx)
EP (1) EP0131760B1 (xx)
JP (1) JPS6016193A (xx)
CH (1) CH650125GA3 (xx)
DE (1) DE3473799D1 (xx)
HK (1) HK90793A (xx)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4820963A (en) * 1986-11-19 1989-04-11 Brother Kogyo Kabushiki Kaisha Driving device for step motor
US5673412A (en) 1990-07-13 1997-09-30 Hitachi, Ltd. Disk system and power-on sequence for the same
US5216347A (en) * 1991-03-29 1993-06-01 Sgs-Thomson Microelectronics, Inc. Stepper motor control system
JP2000069796A (ja) * 1998-06-10 2000-03-03 Asmo Co Ltd ステッピングモ―タの駆動回路及びその駆動装置
JP3440938B2 (ja) * 1998-12-14 2003-08-25 セイコーエプソン株式会社 電子機器および電子機器の制御方法
JP3799300B2 (ja) * 2002-06-05 2006-07-19 キヤノン株式会社 ステッピングモータ駆動装置
US6914855B2 (en) * 2002-09-27 2005-07-05 Timex Group B.V. Circuit for driving motor coils in stepping motors
DE102004033399B4 (de) * 2004-07-02 2009-04-02 Visteon Global Technologies, Inc., Dearborn Schaltung zur Ansteuerung mehrerer miteinander gekoppelter Schrittmotoren
JP6071671B2 (ja) * 2013-03-18 2017-02-01 シチズン時計株式会社 電子時計
US11785715B2 (en) 2021-12-17 2023-10-10 Exro Technologies Inc. Article for power inverter and power inverter

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5077812A (xx) * 1973-11-15 1975-06-25
JPS52125712A (en) * 1976-04-13 1977-10-21 Sanyo Electric Co Ltd Control circuit of electric motor
US4055786A (en) * 1976-05-06 1977-10-25 General Electric Company Control system for time sharing multiple stepper motors with a single controller
CH616554B (fr) * 1978-07-11 Ebauches Electroniques Sa Montre electronique a moteur pas a pas equipee d'un systeme d'alarme.
GB2054978B (en) * 1979-07-06 1984-06-13 Ebauches Sa Electromagnetic motor rotatable in either direction
CH632128B (fr) * 1979-09-07 Ebauches Sa Dispositif de commande de deux moteurs pas a pas dans une piece d'horlogerie electronique.
WO1981001205A1 (en) * 1979-10-18 1981-04-30 Portescap Step by step micromotor for a clockwork
EP0030611B1 (de) * 1979-12-12 1985-07-03 Braun Aktiengesellschaft Verfahren und Anordnung zur Steuerung und Regelung eines Motors mit permanentmagnetischem Läufer
JPS5740672A (en) * 1980-08-25 1982-03-06 Seiko Instr & Electronics Ltd Electronic watch
CH647128GA3 (xx) * 1982-02-15 1985-01-15
CH647382GA3 (xx) * 1982-04-21 1985-01-31

Also Published As

Publication number Publication date
CH650125GA3 (xx) 1985-07-15
EP0131760A1 (fr) 1985-01-23
HK90793A (en) 1993-09-10
DE3473799D1 (en) 1988-10-13
US4558268A (en) 1985-12-10
JPS6016193A (ja) 1985-01-26

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