EP0108711B1 - Procédé et dispositif de commande d'un moteur pas-à-pas - Google Patents

Procédé et dispositif de commande d'un moteur pas-à-pas Download PDF

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Publication number
EP0108711B1
EP0108711B1 EP83810453A EP83810453A EP0108711B1 EP 0108711 B1 EP0108711 B1 EP 0108711B1 EP 83810453 A EP83810453 A EP 83810453A EP 83810453 A EP83810453 A EP 83810453A EP 0108711 B1 EP0108711 B1 EP 0108711B1
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EP
European Patent Office
Prior art keywords
rotor
pulse
duration
circuit
winding
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
EP83810453A
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German (de)
English (en)
French (fr)
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EP0108711A1 (fr
Inventor
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
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Eta SA Fabriques dEbauches
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Publication of EP0108711A1 publication Critical patent/EP0108711A1/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
    • G04C3/143—Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g. detection of unwanted or missing step

Definitions

  • One of the objects of the present invention relates to a method of controlling a stepping motor having a coil, a rotor magnetically coupled to the coil and means for bringing or holding the rotor in at least one rest position determined in the absence of current in the coil, consisting in applying to the coil a driving pulse having a first duration each time the rotor must turn by one step, to produce a detection signal if the rotor has not turned correctly in response to the driving pulse, to apply a catch-up pulse to the coil having a second duration greater than the first duration in response to the detection signal, and to apply to the coil, before the catch-up pulse, a release pulse having a third duration less than the first duration intended to cause the rotation of the rotor to the rest position if the latter has been locked in another position.
  • Another object of the present invention relates to a device for controlling a stepping motor having a coil, a rotor magnetically coupled to the coil and means for bringing or maintaining the rotor in at least one rest position determined in the absence of current in the coil, comprising means for applying a driving pulse having a first duration to the coil each time the rotor must turn one step, means for producing a detection signal if the rotor has not not turned correctly in response to the driving pulse, means for applying to the coil a catch-up pulse having a second duration greater than the first duration in response to the detection signal, and means for applying to the coil, before the catch-up pulse, an unlocking pulse having a third duration less than the first duration intended to cause the rotation of the rotor to the rest position if the latter has been locked in another position.
  • the electrical energy required to drive the mechanical elements connected to a stepping motor which can be, for example, the elements for displaying the time information of an electronic timepiece constituted by hands and / or discs, it is generally supplied to it by a control circuit which delivers a driving impulse each time it has to advance one step.
  • a significant reduction in this electrical energy consumed by the motor can be obtained by providing in the control circuit a circuit which adjusts the energy of the driving pulses to the minimum corresponding to the actual mechanical load driven by the motor.
  • US-A-4,212,156 for example, describes a control circuit in which the duration of each driving pulse is already determined before it begins.
  • a detector circuit measures the time which elapses between the end of each driving pulse and the appearance of the first minimum of the current induced in the coil by the oscillations of the rotor around its equilibrium position.
  • control circuit does not modify the duration of the following driving pulses, or, as the case may be, decreases this duration.
  • the control circuit then sends a catch-up pulse of long duration and of the same polarity as the driving pulse which has just ended and increases the duration of the following driving pulse.
  • the detection of the rotation or of the non-rotation of the rotor is therefore carried out immediately, or almost, after each driving pulse.
  • Patent US-A-4,300,223 describes another kind of control circuit in which the duration of each driving pulse is predetermined.
  • a detector circuit measures the intensity of the current flowing in the motor coil about two milliseconds after the start of each driving pulse. If this intensity is less than a predetermined value, this indicates that the rotor is in the correct position to turn in response to this driving pulse, and therefore that it has rotated in response to the previous driving pulse. If this intensity is greater than the predetermined value, this indicates that the rotor is not in the correct position, and therefore that it has not rotated in response to the previous driving pulse. In this case, the control circuit then interrupts the current driving pulse, sends the motor a catch-up pulse of the same polarity as the previous driving pulse, then sends the normal driving pulse again.
  • Patent application EP-A-22 270 describes another control circuit in which the duration of each driving pulse is predetermined. At the end of each driving pulse, the motor coil is placed in open circuit, and the voltage induced by the rotation of the rotor is measured. If this voltage is greater than a predetermined value, it means that the rotor has turned correctly in response to this driving pulse. If, on the other hand, this tension is lower than this predetermined value, it means that the rotor was not in the position which it should have occupied at the beginning of this driving impulse, and therefore that it did not turn in response at the previous driving impulse nor in response to this driving impulse. The control circuit then applies to the motor two take-up pulses having a long duration and intended to cause the rotor to perform the rotations which it has not carried out in response to these two driving pulses.
  • Patent application EP-A-24 737 describes a circuit of the same kind as the previous one, but in which the detection of the rotation, or not, of the rotor is made by determining whether the integral of the voltage induced in the coil of the engine for a specified period exceeds or does not exceed a predetermined value.
  • the duration of the driving pulses is generally less than the time taken by the rotor to perform its pitch.
  • the electric energy supplied to the motor by each driving pulse is, in principle, sufficient for the rotor to end its step thanks to the kinetic energy which it has accumulated and to a positioning torque which tends to bring it back or to maintain it , in the absence of current in the coil, in a rest, or equilibrium, stable and determined position.
  • This positioning torque is created by a particular shape given to the pole pieces which surround the rotor of the motor, or by one or more positioning magnets.
  • Curve 1 in FIG. 1 schematically illustrates the variation of this positioning torque as a function of the angle of rotation of the rotor, between two positions of stable equilibrium corresponding to points A and B.
  • this torque When this torque is positive, it tends rotating the rotor in the increasing direction of the angle a and, when it is negative, it tends to rotate it in the decreasing direction of this angle a.
  • the rotor rotates in 180 degree steps, which means that it has two stable equilibrium positions per revolution.
  • the rotor pitch corresponds to a rotation of 360 degrees, which means that the rotor has only a stable equilibrium position.
  • the period of the positioning torque is equal to the angle which separates two successive stable equilibrium positions of the rotor.
  • a position of the rotor represented by the 'point C in Figure 1, and which corresponds approximately to a rotation of half a step, for which this couple is canceled and changes sign.
  • This point C therefore corresponds to an unstable equilibrium position of the rotor.
  • the mechanical load driven by the motor is made up for a large part by the resistant torque due to the inevitable friction of the pivots of the rotor and the toothed wheels which it drives in their bearings, as well as by the friction of the teeth of these wheels between them.
  • This friction torque is represented diagrammatically by curves 2 and 3 in FIG. 1.
  • the rotor If the energy supplied to the rotor by a driving pulse is sufficient for the rotor to reach point D but is not sufficient for it to reach and exceed point E, the rotor therefore remains locked in an intermediate position which can be located anywhere between these points D and E.
  • FIG. 2 schematically illustrates an engine of the type most commonly used in electronic timepieces in the situation where its rotor is locked in such an intermediate position.
  • This figure 2 shows the coil 11, two pole pieces 12 and 13 which are part of the stator of the motor, and the magnet 14 of the rotor.
  • the magnetization axis of this magnet 14 is represented by the arrow 15 which is directed from its south pole towards its north pole.
  • the positioning torque of the rotor is created, in this example, by the notches 16 and 17 formed respectively in the pole pieces 12 and 13.
  • the motor control circuit In normal operation, the motor control circuit, not shown in this FIG. 2, delivers driving pulses to the coil 11 in response to control pulses supplied, for example, by a time base circuit each time the rotor must take a step forward.
  • point A in FIG. 1 corresponds to the position of the rotor where the magnetization axis of its magnet is represented by the arrow 15 'drawn in dotted lines in FIG. 2, and that the rotor has has been brought to the position represented by the arrow 15 by a driving pulse designated by the reference 18 in FIG. 3 and applied to the coil 11 so that the pole piece 12 plays the role of a south magnetic pole and that the pole piece 13 plays the role of a north magnetic pole.
  • the energy supplied to the motor by this pulse was sufficient for the rotor to reach a position situated beyond point D in FIG. 1, but, for some reason, it was insufficient for this rotor to exceed the position corresponding to the point E.
  • the rotor therefore remained locked in the intermediate position shown in FIG. 2.
  • this control circuit sends the motor a catch-up pulse as soon as it detects that the rotor has not finished its pitch.
  • This catch-up pulse which is designated by the reference 19 in FIG. 3, has the same polarity as the driving pulse 18 and a determined duration for turning the rotor by a full step, from point A to point B.
  • this catch-up pulse is not yet finished when the rotor reaches a point B 'which is the point where the positioning torque and the torque created by the current in the coil cancel each other.
  • the rotor oscillates around this point B ', and at the moment when the catch-up pulse ends, it is very possible that it has a speed and a direction of rotation such that it starts again in the direction of point A and repeat a complete step in reverse.
  • FIG. 3 This case is illustrated in FIG. 3 where the references 18 and 19 respectively designate the driving pulse which brought the rotor into the position of FIG. 2 and the catch-up pulse, and where the curve 20 schematically represents the angular position of the rotor as a function of time.
  • the catch-up pulse does not reach its goal, which is to replace a previous driving pulse whose energy was insufficient to turn the rotor correctly.
  • the detector circuit may not provide its detection signal if the rotor has locked in an intermediate position close to position B.
  • the driving pulse which follows that during which the rotor is locked is not interrupted, and the rotor returns to its starting position.
  • the control circuit sends a catch-up pulse, the effect of which can be the same as in the cases described above.
  • Patent application EP-A-62 273 state of the art according to art. 54 (3) (BE) describes, among other things, a method of controlling a stepping motor which solves this problem. This process consists in sending to the motor, after each driving pulse, a short pulse. If the rotor remains blocked in an intermediate position in response to a driving pulse, this short pulse unlocks it and brings it, depending on its polarity, to one or other of its rest positions.
  • each unlocking pulse A certain amount of electrical energy is consumed by each unlocking pulse.
  • the fact of applying an unlocking pulse after each driving pulse represents an electrical energy consumption which unnecessarily reduces the life of the battery supplying the device.
  • An object of the present invention is to provide a method of controlling a stepping motor which avoids this unnecessary consumption of electrical energy.
  • Another object of the present invention is to provide a device for controlling a stepping motor for the implementation of this method.
  • FIG. 4 is a block diagram of an electronic timepiece taken as a nonlimiting example of a device in which the method according to the invention is implemented.
  • This timepiece comprises a stepping motor 101 which drives the hands for displaying the hour, minute and second, not shown, by means of a gear train also not represented.
  • FIG. 4 shows a control circuit according to the invention designated by the reference 102, which supplies driving pulses to the motor 101 in response to a control signal delivered by a time base circuit 103 each time that the rotor of the motor must turn one step, that is to say every second in this example.
  • the time base circuit 103 conventionally comprises an oscillator circuit and a frequency divider circuit which are not shown.
  • the control circuit 102 consists, in this example, of a formatter circuit 104, a detector circuit 105 and a pulse generator 106.
  • the detector circuit 105 is connected to the motor 101 and provides at its output a detection signal if the rotor has not rotated in response to the previous driving pulse.
  • the training circuit 104 uses this detection signal in particular to determine the amount of electrical energy supplied to the motor by each driving pulse.
  • the pulse generator 106 supplies the forming circuit 104 with pulses which are transmitted to the motor 101 to unlock its rotor if necessary.
  • Figure 5 illustrates the operation of the circuit of Figure 4 in the case where the detector circuit 105 is of the same kind as that described in the patent US-A-4,212,156 mentioned above, that is to say a immediate detection circuit.
  • the diagrams designated by the references 103 to 106 represent the signals measured at the outputs of the circuits designated by the same references in FIG. 4.
  • the trainer circuit 104 delivers to the motor 101 a driving pulse of predetermined duration.
  • the detector circuit 105 only delivers a signal if the rotor of the motor 101 does not correctly complete its rotation in response to one of these driving pulses.
  • the trainer circuit 104 supplies the motor 101 with driving pulses of alternating polarities and of predetermined and equal durations.
  • the generator 106 which in this case is connected to the measurement circuit 105 by the link 107 drawn in dotted lines in FIG. 4, does not deliver a pulse either. This situation, which is the normal situation, is not illustrated.
  • FIG. 5 illustrates a case where the rotor does not correctly end its rotation in response to a driving pulse designated by the reference 111, having a duration which is, for example, the minimum duration that these driving pulses can take.
  • the detector circuit 105 delivers a signal 112 which indicates that the rotor has not finished its pitch.
  • This signal 112 causes the generator 106 to form a pulse 113.
  • This pulse 113 is transmitted by the forming circuit 104 to the motor 101 in the form of a pulse 114 having the opposite polarity to that of the driving impulse 111.
  • the signal 112 also causes the formation by the control circuit 104, after the pulse 114, of a pulse 115 having a duration greater than the duration of the pulse 111, and the same polarity as this pulse 111.
  • the pulse 114 unlocks it and causes it to return to its starting position.
  • the rotor is thus in a well-determined position when the forming circuit 104 delivers the pulse 115 intended to make it catch up with the step it has just missed.
  • the signal 112 also acts on the forming circuit 104 so that the latter increases the duration of the driving pulses which it then delivers.
  • a pulse of duration greater than the duration of the pulse 111, is represented in FIG. 5 with the reference 111 '. It obviously has the opposite polarity to that of pulse 111.
  • the detector circuit 105 delivers a signal such as the signal 112 each time the rotor does not finish its pitch correctly.
  • Each signal 112 causes the formation of an unblocking pulse such as the pulse 114 and of a catch-up pulse such as the pulse 115.
  • the forming circuit 104 delivers at least a predetermined number d 'motor pulses of the same duration as pulse 111'. When this number is reached, the forming circuit 104 reduces the duration of the driving pulses to that of the pulse 111.
  • the forming circuit 104 it would be possible to arrange the forming circuit 104 so that it delivers unblocking pulses having the same polarity as the previous driving pulse. These pulses would have the effect of unlocking the rotor and making it complete its rotation. It would then obviously no longer be necessary to provide the catch-up pulses such as the pulses 115.
  • Curve 4 in FIG. 1 schematically represents the torque created by an unlocking pulse having the same polarity as the driving pulse which brought the rotor into the position where it got stuck, between points D and E.
  • This torque decreases during the rotation it causes in the direction of point B and becomes less than the friction torque represented by curve 3. It could therefore happen that this impulse does not fully unlock the rotor.
  • the torque created by an unlocking pulse having the opposite polarity to that of the driving pulse in response to which the rotor is blocked which is represented diagrammatically by curve 5, increases during the rotation which it causes. in the direction of point A. This pulse therefore safely releases the rotor.
  • FIG. 6 illustrates an example of a control circuit of a stepping motor according to the invention, in which the detection of the rotation or of the non-rotation of the rotor takes place immediately after each driving pulse,. as in the circuit which is described in the patent US-A-4,212,156 already cited.
  • Figures 7a and 7b show signals measured at some points of the circuit of Figure 6 in two cases of operation of this circuit. Each diagram of these Figures 7a and 7b is designated by the reference to the point in Figure 6 where the signal it represents is measured, and the diagram designated by the reference 11 represents the voltage measured across the motor coil.
  • the motor coil 11 is conventionally connected in a bridge formed by 4 MOS transistors 21 to 24.
  • An oscillator 34 is connected to the input of a frequency divider 51 whose outputs 51a to 51e for example deliver signals having frequencies of 0.5 Hz, 1 Hz, 8 Hz, 16 Hz and 1'024 respectively Hz.
  • a control circuit 52 which includes doors, flip-flops and counters, the arrangement of which is described in detail in the patent US-A-4,212,156 already cited. Some of these doors use the signals supplied in particular by the outputs 51f of the divider 51 to form pulses having various durations.
  • the circuit 52 delivers a pulse on its output 52a or on its output 52b according to whether the output 51 a of divider 51 is in state "0" or in state "1". This pulse is selected from among the pulses of different durations mentioned above according to the state of an input 52e of circuit 52.
  • This input 52e is connected to the output of a circuit detecting the rotation of the rotor which will be described below.
  • Each pulse delivered by the output 52a of the circuit 52 is transmitted to the gates of the transistors 21 and 23 via an OR gate 53.
  • the coil 11 therefore receives a driving pulse which causes the passage, in this coil 11, of a current in the direction of the arrow 39.
  • each pulse delivered by the output 52b is transmitted to the gates of the transistors 22 and 24 via an OR gate 54, which causes the application to the coil 11 of a driving pulse having the reverse polarity of the previous one and the passage through this coil 11 of a current in the opposite direction to that of arrow 39.
  • the input 52e of the circuit 52 is in the logic state "0", and the pulses delivered by the outputs 52a or 52b have a short duration, of 5.1 milliseconds for example.
  • the output of the rotation detector, and therefore the input 52e of the circuit 52 pass to the state "1" about ten milliseconds after the start of this pulse motor.
  • the output 51 c of the divider 51 changes to the state "1", that is to say 62.5 milliseconds after the start of the driving pulse
  • the output 52a or 52b which delivered the last pulse delivers a new pulse, with a duration of, for example, 7.8 milliseconds.
  • This pulse called the catch-up pulse, is intended to cause the rotor to execute the step it has just missed.
  • the duration of the pulses delivered alternately by the outputs 52a and 52b in response to the transition to the state "1" of the signal at 1 Hz is increased to, for example, 7, 8 milliseconds. If the input 52e remains in the state "0" for all the predetermined time, that is to say if the rotor has rotated correctly, the duration of the pulses delivered by the outputs 52a and 52b is reduced to 5.1 milliseconds.
  • the circuit 52 also includes two outputs 52c and 52d which each deliver a pulse each time the output 52a or the output 52b delivers a normal pulse.
  • the pulse delivered by the output 52c has a duration of approximately ten milliseconds, and the pulse delivered by the output 52d has a duration equal to that of the pulses delivered by the output 52a or 52b.
  • the terminals of the coil 11 are connected to the inputs 55a and 55b of a circuit 55, which is also described in patent US-A-4,212,156.
  • This circuit 55 includes a differentiator circuit and transmission gates controlled by the signal at 0.5 Hz which is applied to an input 55c. According to the state of this signal at 0.5 Hz, the differentiator circuit is connected to one or the other of the terminals of the coil 11. This differentiator circuit is arranged so as to supply a pulse to the output 55d each time that the current in the coil 11 passes through a minimum.
  • This pulse is applied to a first input of an AND gate 56, a second and a third input of which are respectively connected to output 52c and, via an inverter 57, to output 52d of the control circuit 52.
  • the output of gate 56 is connected to the clock input CI of a type T flip-flop 58.
  • the output ⁇ of the flip-flop 58 is connected to a first input of an AND gate 59 whose second input is connected to output 52c of circuit 52 by means of an inverter 60.
  • gate 59 is connected to the clock input CI of a flip-flop 61, also of type T, the output Q of which is connected to the input 52e of circuit 52.
  • the reset inputs R of the flip-flops 58 and 61 are connected to the output 51 b of the divider 51 by means of an inverter 62.
  • the flip-flop 58 is therefore still in its rest state when the output 52c of the circuit 52 returns to the state "0". This change to state "0" causes the flip-flop 61 to topple over through the inverter 60 and the gate 59.
  • the input 52e of the circuit 52 which is connected to the output Q of the flip- flop 61, therefore goes to state "1", with the consequences described above.
  • the flip-flop 58 or the flip-flop 61 which has rocked as described above is returned to its rest state by the state "1" which is applied to its input R by the inverter 62 when the signal at 1 Hz returns to state "0".
  • the circuit of FIG. 6 comprises an AND gate 71 having two inputs connected respectively to the output Q of the flip-flop 61 and to the output 51 d of the divider 51.
  • the output of this gate 71 is connected to the clock input CI of a flip-flop 72, of type T.
  • the clock input CI of a flip-flop 73 is connected to the output 51e of the divider 51, and its input D is connected to the output Q of the flip-flop 72.
  • the output Q of the flip-flop 73 is connected to the first inputs of two AND gates 74 and 75.
  • the output 51 a of the divider 51 is connected to the second input of door 74 and, by means of an inverter 76, to the second input of door 75.
  • the outputs of these doors 74 and 75 are connected respectively at the second entrances of doors 53 and 54.
  • the reset flip-flop input R 72 is connected to the output of an AND gate 77 of which a first input is connected to the output of flip-flop 73 and of which a second input is connected to output 51 e of the divider 51 by means of an inverter 78.
  • the pulse delivered by the output Q of the flip-flop 73 is transmitted to the gates of the transistors 22 and 24 through the gates 75 and 54. This case is illustrated in FIG. 7b.
  • the pulse delivered by the output Q of the flip-flop 73 is transmitted to the gates of the transistors 21 and 23 through the gates 74 and 53.
  • this pulse delivered by the output Q of the flip-flop 73 causes the passage through the coil 11 of a current pulse in the opposite direction to that of the driving pulse which has failed to rotate. the rotor correctly.
  • this pulse of about a millisecond causes the rotor to be released and rotated in the direction which brings it back to its starting position.
  • the circuit 52 delivers the catch-up pulse described above, the rotor is in the position where this catch-up pulse causes it to advance with a single step, with safety.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Stepping Motors (AREA)
  • Electromechanical Clocks (AREA)
EP83810453A 1982-10-13 1983-10-05 Procédé et dispositif de commande d'un moteur pas-à-pas Expired EP0108711B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH597482A CH649187GA3 (enrdf_load_stackoverflow) 1982-10-13 1982-10-13
CH5974/82 1982-10-13

Publications (2)

Publication Number Publication Date
EP0108711A1 EP0108711A1 (fr) 1984-05-16
EP0108711B1 true EP0108711B1 (fr) 1987-06-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP83810453A Expired EP0108711B1 (fr) 1982-10-13 1983-10-05 Procédé et dispositif de commande d'un moteur pas-à-pas

Country Status (5)

Country Link
US (1) US4507599A (enrdf_load_stackoverflow)
EP (1) EP0108711B1 (enrdf_load_stackoverflow)
JP (1) JPS5989596A (enrdf_load_stackoverflow)
CH (1) CH649187GA3 (enrdf_load_stackoverflow)
DE (1) DE3372022D1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4598240A (en) * 1984-08-29 1986-07-01 Eaton Corporation Self synchronous motor sensor switching arrangement
FR2668866B1 (fr) 1990-11-07 1992-12-31 Ebauchesfabrik Eta Ag Procede de commande d'un moteur pas a pas et dispositif pour la mise en óoeuvre de ce procede.
JP3256342B2 (ja) * 1993-08-04 2002-02-12 ティーアールダブリュ オートモーティブ ジャパン株式会社 ステッピングモータの脱調検出装置
KR20110002204A (ko) * 2009-07-01 2011-01-07 삼성전자주식회사 모터 제어 장치 및 그 모터 제어 방법

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0022270A1 (fr) * 1979-07-09 1981-01-14 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Détecteur de position d'un moteur pas à pas
EP0024737A1 (fr) * 1979-09-04 1981-03-11 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Détecteur d'avance d'un moteur pas à pas
EP0082821A1 (fr) * 1981-12-23 1983-06-29 Eta SA Fabriques d'Ebauches Montre électronique munie de moyens de détection du passage d'une aiguille par une position de référence

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4367049A (en) * 1977-09-02 1983-01-04 Ebauches S.A. Driving device especially for a timepiece
JPS5477169A (en) * 1977-12-02 1979-06-20 Seiko Instr & Electronics Ltd Electronic watch
FR2450527A1 (fr) * 1979-03-01 1980-09-26 Suisse Horlogerie Moteur pas a pas non reversible
CH644983GA3 (enrdf_load_stackoverflow) * 1981-03-31 1984-09-14

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0022270A1 (fr) * 1979-07-09 1981-01-14 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Détecteur de position d'un moteur pas à pas
EP0024737A1 (fr) * 1979-09-04 1981-03-11 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Détecteur d'avance d'un moteur pas à pas
EP0082821A1 (fr) * 1981-12-23 1983-06-29 Eta SA Fabriques d'Ebauches Montre électronique munie de moyens de détection du passage d'une aiguille par une position de référence

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Publication number Publication date
JPH0116119B2 (enrdf_load_stackoverflow) 1989-03-22
EP0108711A1 (fr) 1984-05-16
CH649187GA3 (enrdf_load_stackoverflow) 1985-05-15
US4507599A (en) 1985-03-26
DE3372022D1 (en) 1987-07-16
JPS5989596A (ja) 1984-05-23

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