EP0021320B1 - Gangdetektionsschaltung für Schrittmotor - Google Patents

Gangdetektionsschaltung für Schrittmotor Download PDF

Info

Publication number
EP0021320B1
EP0021320B1 EP80103366A EP80103366A EP0021320B1 EP 0021320 B1 EP0021320 B1 EP 0021320B1 EP 80103366 A EP80103366 A EP 80103366A EP 80103366 A EP80103366 A EP 80103366A EP 0021320 B1 EP0021320 B1 EP 0021320B1
Authority
EP
European Patent Office
Prior art keywords
motor
signal
type
pulses
pulse
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
EP80103366A
Other languages
English (en)
French (fr)
Other versions
EP0021320A1 (de
Inventor
Mai Tu Xuan
Marcel Jufer
André Indian Institute of Science Pittet
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.)
SSIH Management Services SA
Original Assignee
Societe Suisse pour lIindustrie Horlogere Management Services 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 Societe Suisse pour lIindustrie Horlogere Management Services SA filed Critical Societe Suisse pour lIindustrie Horlogere Management Services SA
Publication of EP0021320A1 publication Critical patent/EP0021320A1/de
Application granted granted Critical
Publication of EP0021320B1 publication Critical patent/EP0021320B1/de
Expired legal-status Critical Current

Links

Images

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
    • G04C3/143—Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g. detection of unwanted or missing step

Definitions

  • the present invention relates to a device for supplying a single-phase motor for a timepiece comprising a step detector comprising first means for taking a first signal Ud developed by the current flowing through the motor coil, the device being arranged to control the running of the motor by a first type of bipolar pulses of small width or by a second type of pulses of greater width, a train of said second type of pulses being sent to the motor if the latter has not increased by one step in response to said first type of pulse.
  • a control device of this type is known.
  • the German disclosure DE-A-27 45 052 describes a control system which applies to the motor a low energy signal if the motor load is low and a high energy signal if the motor load is high and this for the purpose to reduce the watch's energy consumption by around 60%.
  • the cited invention bases the passage from the first signal to the second signal on the observation of the shape of the motor current, the maxima of which move to the right when the load of the motor increases. By detecting the position of the maxima, it is thus possible to send a large control pulse (eg 7.8 ms) to the motor when the mechanical torque increases, which is the case, for example, during loading. of the calendar date.
  • This system has the disadvantage of not being able to know if, as a result of the control pulse, the motor has advanced by one step. There may then be circumstances where a train of pulses of large width is sent to the motor without any need.
  • US-A-4,114,364 also proposes to lengthen the control pulse in response to the load of the motor. Besides the fact that the system does not detect the rotation of the rotor, it has the drawback of high consumption, which is not the objective set.
  • Applications GB-A-2 006 995 and GB-A-2 009 464 also illustrate devices of the same type.
  • the induced voltage collected across the motor coil is used in a particular circuit to produce modulated control pulses
  • a circuit is provided capable of detecting the charging conditions of the motor by means of a high value resistor connected in series with the coil. Neither of these requests calls upon the device which will be described below and which consists in integrating the induced voltage produced by the motor.
  • the supply device is characterized in that it further comprises second means for creating a second signal whose value indicates whether the motor has advanced by one step in response to a small width pulse, the integration limits being between instant 0 which is that of the establishment of the pulse and instant T from which the current has substantially ceased in the coil.
  • the invention which will be described aims firstly at reducing the consumption of the timepiece. It can be seen that a watch micromotor generally works almost empty. However, to ensure proper operation in special cases such as temperature variation, external magnetic field, shock, angular acceleration, etc., it is necessary to supercharge it, which leads to unnecessary consumption of the battery energy.
  • the invention proposes a new device for controlling the pitch of the motor which makes it possible to adapt, with large safety margins, the supply as a function of the load, from which it results an appreciable gain in energy consumption.
  • FIG. 1 is a flowchart of supply with pitch control.
  • the motor is normally supplied by short duration pulses (eg 6 ms) emitted by the generator 1.
  • a position detector 2 object of the present invention and which will be described in detail later, makes it possible to check whether the motor took his step. If so, the decision-maker 3 informs the generator 1 via line 4 that it must continue to supply the engine. If not, the same decision-making unit controls, via line 5, the generator 6 which emits long duration pulses (eg 8 ms) which supply the motor and replace the short duration pulses. This substitution takes place for a time of n seconds fixed by the counter 7.
  • the motor is again supplied with short-duration pulses. It can be seen that the motor is supplied alternately and as required either by loop 8 giving short duration pulses, the detector being in operation, or by loop 9 giving long duration pulses for a time determined by the counter, the detector off.
  • loop 8 giving short duration pulses
  • loop 9 giving long duration pulses for a time determined by the counter, the detector off.
  • the various anomalies which may arise during operation due to the causes mentioned above last for a certain time. It will therefore be understood that systematically sending a long pulse after each short pulse which has failed to advance the motor by one step would be expensive in terms of energy consumed and contrary to the aim which the invention proposes to achieve.
  • the duration for which the long pulses are sent to the motor is of the order of 5 minutes, but other values could be chosen.
  • FIG. 2a represents the train of short pulses which is sent to the motor when the latter takes its step.
  • the pulses 10, bipolar and with a duration of the order of 6 ms, are emitted every second by the generator 1.
  • FIG. 2b represents the train of long pulses 11 with a duration of the order of 8 ms emitted by generator 6, pulses succeeding each other at a rate of one second.
  • the start of the long pulse is offset by 40 ms from the start of the short pulse and when the position detector, after pulse 12 shown in FIG. 2c, detects an absence of rotation, the train of long pulses 13 is sent to the motor for approximately 5 minutes, after which the motor is switched again to the short pulses 14.
  • FIG. 3 represents the value of the couples C which act on the rotor as a function of its angle of rotation ⁇ .
  • the rotor of the stepping motor is subjected to two kinds of torques: a static holding torque Ca due to the magnet alone and a dynamic torque Cab motor due to the interaction of the flux of the magnet with the flow of the coil when it is supplied. Initially the rotor is in position S ,. If an impulse is sent to the motor and it takes its step, it will find itself in position S 2 .
  • a represents the value of the mutual magnet-coil flux p as a function of the angle of rotation of the rotor.
  • the present invention is precisely based on the value of this flux which takes different values depending on whether the motor has progressed by one step or not.
  • the signal Uc is compared with a reference voltage Ur in a comparator 25. This comparison takes place approximately 30 ms after the start of the control pulse, thanks to a clock signal coming from the frequency divider. If Uc is larger than Ur, the motor has passed its pitch and no signal appears at the output of the comparator: the control circuit continues to emit short duration pulses. If on the contrary Uc is smaller than Ur, the motor has not crossed its pitch and a signal Us appears at the output of the comparator which by line 26 obliges the control circuit to emit a train of pulses of long duration 13 as shown in Figure 2c. During the time when the pulses 13 are emitted, the amplifier 23 is blocked by line 27.
  • FIG. 4b shows an alternative embodiment of the invention.
  • a sensing coil 28 at the terminals of which the voltage Ud is developed which, in turn, attacks a circuit similar to that which has just been described.
  • the short pulse has a duration of approximately 6 ms and the long pulse a duration of approximately 8 ms.
  • the measurement of the voltage Uc by the comparator takes place 30 ms after the start of the control pulse. This value can vary depending on the type of motor used and lower values can be chosen provided that at this point 1 at all current has substantially stopped in the coil.
  • Figure 2c This offset naturally depends on the instant which has been chosen for the measurement of the voltage Uc since the train of long pulses will only intervene, if necessary, after said measurement.
  • the figure shows an offset of 40 ms for a measurement made after 30 ms. If this measurement is made earlier, for example after 15 ms already, the offset can be shortened to 25 ms.
  • FIG. 5 shows the shape of the voltage Uc and of the current i in the coil when the rotor has taken its step in response to a short pulse of 6 ms and for a well-defined type of stepping motor.
  • Curve 1 has been recorded for a zero torque applied to the motor shaft, curve 2 for a torque of 3 - 10- 7 Nm and curve 3 for a torque of 6 - 10 -7 Nm.
  • the voltage Uc collected at the output of the integrator has a value of the order of 1 volt. Note here the shift to the right of the current maxima when the torque increases (see publication cited DE-A-27 45 052) but which is not, in the present invention, an operating criterion of the pitch.
  • FIG. 6 shows the shape of the voltage Uc and of the current i in the coil when the rotor has not taken its step in response to a short pulse of 6 ms.
  • Curve 1 was plotted for a torque of 9. 10- 7 Nm applied to the motor shaft, curve 2 . for a torque of 12 - 10- 7 Nm and curve 3 for a torque of 15. 10- 7 Nm.
  • the voltage Uc at the output of the integrator is very weak. Note here that detection of the maximum speed or, if you prefer, a minimum of current between 0 and 6 ms, as proposed in the cited application CH-A-13 723 72, would conclude with the passage of a step , while this is not the case as shown in the diagram.
  • the main purpose of the system is to reduce the energy consumption of the timepiece and to achieve this by means of an integrator which can be suitable for any stepping motor. If this motor is dimensioned for the servo offered by the present invention, an energy saving of the order of 60% has been measured.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Control Of Stepping Motors (AREA)

Claims (4)

1. Vorrichtung zur Versorgung eines einphasigen Schrittmotors (22) für Uhrwerke mit einem Schrittdetektor und mit ersten Mitteln zur Abnahme eines ersten Signals Ud, das von dem die Motorspule durchlaufenden Strom erzeugt wird, wobei die Vorrichtung derart angeordnet ist, dass sie den Motorgang mittels einer ersten Art bipolarer Impulse geringer Breite (10) steuert oder mittels einer zweiten Art breiterer Impulse ( 1 1 wobei eine Folge der zweiten Art von Impulsen dem Motor zugeführt wird, sofern letzterer nicht um einen Schritt fortgeschritten ist, infolge der ersten Art Impulse, dadurch gekennzeichnet, dass sie ferner zweite Mittel aufweist zur Erzeugung eines zweiten Signals
Figure imgb0012
dessen Wert anzeigt, ob der Motor um einen Schritt fortgeschritten ist infolge eines Impulses geringer Breite, wobei der Integrationsbereich zwischen dem Zeitpunkt (0), der der Erzeugung des Impulses entspricht und dem Zeitpunkt (T) liegt, zu dem der Strom in der Spule im wesentlichen abgeschaltet ist.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die ersten Mittel eine Brücke aufweisen, deren einer Arm von der Spule des Motors (22) gebildet wird, wobei die erste Diagonale der Brücke (a, b) mit den ersten und zweiten Arten von Impulsen beaugschlagt wird und die zweite Diagonale der Brücke (c, d) das Eingangssignal Ud eines Differentialverstärkers (23) liefert, dessen Ausgang mit dem Eingang eines der zweiten Mittel verbunden ist, welche die Form eines Integrators (24) bilden, wobei das Ausgangssignal Uc des Integrators einen Komparator (25) beaufschlagt, der dieses Ausgangssignal mit einem Referenzsignal Ur vergleicht zur Erzeugung eines Messsignals Us, wenn der Motor nicht um einen Schritt fortgeschritten ist infolge des Impulses geringer Breite.
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die ersten Mittel eine Messspule (28) aufweisen, die im magnetischen Kreis des Motors eingesetzt ist, wobei die an den Anschlüssen dieser Spule anstehende Spanning das Eingangssignal Ud eines Differentialverstärkers (23) bildet, dessen Ausgang mit dem Eingang der zweiten Mittel verbunden ist, das die Form eines Integrators (24) aufweist, wobei das Ausgangssignal Uc des Integrators einen Komparator (25) beaufschlagt, der das Ausgangssignal mit einem Referenzsignal Ur vergleicht zur Erzeugung eines Messsignals Us, wenn der Motor nicht um einen Schritt fortgeschritten ist infolge des Impulses geringer Breite.
4. Vorrichtung nach Ansprüchen 2 oder 3, dadurch gekennzeichnet, dass der Komparator (25) das Messsignal Us liefert, sowie im wesentlichen kein Strom mehr in der Motorspule fliesst.
EP80103366A 1979-06-21 1980-06-18 Gangdetektionsschaltung für Schrittmotor Expired EP0021320B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7916816 1979-06-21
FR7916816A FR2459579A1 (fr) 1979-06-21 1979-06-21 Detecteur d'avance d'un moteur pas a pas

Publications (2)

Publication Number Publication Date
EP0021320A1 EP0021320A1 (de) 1981-01-07
EP0021320B1 true EP0021320B1 (de) 1984-02-15

Family

ID=9227263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80103366A Expired EP0021320B1 (de) 1979-06-21 1980-06-18 Gangdetektionsschaltung für Schrittmotor

Country Status (6)

Country Link
US (1) US4346463A (de)
EP (1) EP0021320B1 (de)
JP (1) JPS5631677A (de)
CA (1) CA1164523A (de)
DE (1) DE3066572D1 (de)
FR (1) FR2459579A1 (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2461399A1 (fr) * 1979-07-09 1981-01-30 Suisse Horlogerie Detecteur de position d'un moteur pas a pas
FR2464478A1 (fr) * 1979-09-04 1981-03-06 Suisse Horlogerie Detecteur d'avance d'un moteur pas a pas
CH647383GA3 (de) * 1981-02-04 1985-01-31
FR2529032A1 (fr) * 1982-06-21 1983-12-23 Omega Brandt & Freres Sa Louis Procede d'alimentation d'un moteur pas a pas monophase pour piece d'horlogerie
NL8203094A (nl) * 1982-08-04 1984-03-01 Philips Nv Werkwijze voor het analyseren van de in een bekrachtigingsspoel van een stappenmotor geinduceerde spanning.
CH653850GA3 (de) * 1983-08-12 1986-01-31
DE3442373A1 (de) * 1984-11-20 1986-05-28 Voest-Alpine Friedmann GmbH, Linz Schaltungsanordnung zur ueberwachung eines schrittmotors
US5247235A (en) * 1988-06-01 1993-09-21 Detra Sa Method of supplying power to a single phase step motor
EP0790539B1 (de) * 1996-02-13 1998-04-01 Detra Sa Verfahren und Vorrichtung zum Steuern eines einphasigen Schrittmotors
US8500692B2 (en) * 2007-12-21 2013-08-06 Medingo Ltd. Devices and methods for powering a medical device
RU173260U1 (ru) * 2016-12-19 2017-08-21 Федеральное государственное автономное образовательное учреждение высшего образования "Крымский федеральный университет имени В.И. Вернадского" Устройство для обнаружения отказов в шаговом электроприводе
JP7205338B2 (ja) * 2019-03-25 2023-01-17 セイコーエプソン株式会社 電子時計、ムーブメントおよびモーター制御回路

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2006995A (en) * 1977-09-26 1979-05-10 Citizen Watch Co Ltd Drive system for pulse motor
GB2009464A (en) * 1977-12-02 1979-06-13 Seiko Instr & Electronics Stepping motor driven analog timepieces

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH585428B5 (de) * 1972-09-20 1977-02-28 Portescap
JPS6024680B2 (ja) * 1973-03-07 1985-06-14 セイコーインスツルメンツ株式会社 時計用ステツプモ−タの駆動回路
JPS5292560A (en) * 1976-01-29 1977-08-04 Seiko Instr & Electronics Ltd Switch box drive pulse width control circuit for electronic clocks
NL7601844A (nl) * 1976-02-24 1977-08-26 Philips Nv Stappenmotor met bekrachtigingsschakeling.
JPS5345575A (en) * 1976-10-06 1978-04-24 Seiko Epson Corp Electronic wristwatch
JPS5393319A (en) * 1977-01-28 1978-08-16 Seiko Instr & Electronics Ltd Clock step motor pulse control
JPS5396420A (en) * 1977-02-02 1978-08-23 Seiko Instr & Electronics Ltd Driving circuit of motor for watch
JPS53114467A (en) * 1977-03-16 1978-10-05 Seiko Instr & Electronics Ltd Electronic watch
JPS53132385A (en) * 1977-04-23 1978-11-18 Seiko Instr & Electronics Ltd Electronic watch
JPS53132380A (en) * 1977-04-23 1978-11-18 Seiko Instr & Electronics Ltd Electronic watch
JPS5428176A (en) * 1977-08-04 1979-03-02 Seiko Instr & Electronics Ltd Electronic watch
CH625384B (fr) * 1977-12-20 Ebauches Electroniques Sa Dispositif de detection de la non rotation de moteurs pas a pas pour piece d'horlogerie et de rattrapage des pas perdus.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2006995A (en) * 1977-09-26 1979-05-10 Citizen Watch Co Ltd Drive system for pulse motor
GB2009464A (en) * 1977-12-02 1979-06-13 Seiko Instr & Electronics Stepping motor driven analog timepieces

Also Published As

Publication number Publication date
FR2459579B1 (de) 1982-11-19
FR2459579A1 (fr) 1981-01-09
JPS6128315B2 (de) 1986-06-30
JPS5631677A (en) 1981-03-31
CA1164523A (en) 1984-03-27
DE3066572D1 (en) 1984-03-22
US4346463A (en) 1982-08-24
EP0021320A1 (de) 1981-01-07

Similar Documents

Publication Publication Date Title
EP0021320B1 (de) Gangdetektionsschaltung für Schrittmotor
FR2723904A1 (fr) Unite d'entrainement electrique pour automobiles
EP0128865A1 (de) Verfahren zur Verbesserung der Dämpfung bei der Stillegung eines Polyphasenmotors, insbesondere eines Schrittmotors, und Anordnung für die Durchführung des Verfahrens
FR2509923A1 (fr) Circuit d'evaluation de signal electrique de couple sur une perceuse
EP0022270B1 (de) Stellungsdetektor für einen Schrittmotor
EP0024737B1 (de) Detektor für die Fortbewegung eines Schrittmotors
FR2485293A1 (fr) Procede de commande d'un embrayage d'entrainement d'alternateur notamment pour vehicules automobiles et dispositif pour la mise en oeuvre dudit procede
EP0135104B1 (de) Verfahren und Vorrichtung zum Ansteuern eines Schrittmotors
FR2529682A1 (fr) Systeme de controle de source de courant
FR2626118A1 (fr) Dispositif de controle d'un moteur a courant continu destine notamment a commande d'ouvrants sur des vehicules automobiles
EP0982825B1 (de) Drehzahlregelvorrichtung für einen elektrischen Motor und Vorrichtung zum Schleudern mit einer solchen Vorrichtung
CA1031051A (en) Electronic security circuit
EP0345224B1 (de) Spannungszuführmethode für Einphasen-Schrittmotoren für Zeitwerke
EP0140089B1 (de) Verfahren zur Steuerung eines Schrittmotors
FR2786284A1 (fr) Procede de controle de mouvement d'un element servocommande
EP0736963B1 (de) Verfahren und Vorrichtung zur Regelung eines Schrittmotors
EP0702451A1 (de) Steuervorrichtung eines Synchronmotors
EP1267479A1 (de) Bürstenloser Gleichstrommotor, Verfahren zum Anlaufen desselben und Verwendung desselben
FR2918760A1 (fr) Procede et dispositif de diagnostic d'une grandeur de sortie fournie par un moteur a courant continu
EP1034997A1 (de) Vorrichtung zur Regelung des Reibschlusses eines elektrisch angetriebenen Eisenbahnzuges
FR2732834A1 (fr) Dispositif de controle angulaire d'un moteur pas a pas
FR2721999A1 (fr) Debimetre massique redondant
FR2627916A1 (fr) Dispositif de commande de moteur a courant continu
EP0190591A1 (de) Motorwerk geeignet für hohe Geschwindigkeit
EP2064563B1 (de) Vorrichtung mit uhr zur messung der parameter einer stromquelle

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE GB IT

17P Request for examination filed

Effective date: 19810624

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): CH DE GB IT LI

REF Corresponds to:

Ref document number: 3066572

Country of ref document: DE

Date of ref document: 19840322

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19960522

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19960612

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19960619

Year of fee payment: 17

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970618

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970630

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970630

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970618

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980303