EP0021320A1 - Gangdetektionsschaltung für Schrittmotor - Google Patents

Gangdetektionsschaltung für Schrittmotor Download PDF

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Publication number
EP0021320A1
EP0021320A1 EP80103366A EP80103366A EP0021320A1 EP 0021320 A1 EP0021320 A1 EP 0021320A1 EP 80103366 A EP80103366 A EP 80103366A EP 80103366 A EP80103366 A EP 80103366A EP 0021320 A1 EP0021320 A1 EP 0021320A1
Authority
EP
European Patent Office
Prior art keywords
motor
signal
pulse
coil
integrator
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.)
Granted
Application number
EP80103366A
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English (en)
French (fr)
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EP0021320B1 (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
SSIH Management Services SA
Societe Suisse pour lIindustrie Horlogere Management Services SA
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Application filed by SSIH Management Services SA, Societe Suisse pour lIindustrie Horlogere Management Services SA filed Critical SSIH Management Services SA
Publication of EP0021320A1 publication Critical patent/EP0021320A1/de
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Publication of EP0021320B1 publication Critical patent/EP0021320B1/de
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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

  • the subject of the present invention is a device for supplying a single-phase stepping motor for a timepiece 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. bipolar of greater width, a train of said second type of pulses being sent to the motor if the latter has not progressed by one step in response to said first type of pulses.
  • a control device of this type is known.
  • the German presentation DEOS 27 45 052 describes a control system which applies a low energy signal to the motor if the motor load is low and a high energy signal if the motor load is high, with the aim of reducing d 'about 60% of the watch's energy consumption.
  • 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 at the time of 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 very large pulses is sent to the motor without any need.
  • US patent 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.
  • the power supply device is characterized in that it comprises a step detector comprising first means for taking a first signal Ud developed by the current which flows through the coil of said motor and second means for creating a second signal the value of which indicates whether the motor has advanced one step in response to a narrow pulse.
  • the invention which will be described aims firstly at reducing the consumption of the timepiece.
  • a watch micromotor generally works practically empty.
  • 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 supply flow diagram 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 has made its move. If so, the decision-making body 3 has given line 4 to generator 1 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 substitutionalieu for a time of n seconds fixed by the counter 7.
  • the motor is again supplied by 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.
  • 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 during 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 long pulse train 11 with a duration of the order of 8 ms emitted by the generator 6, pulses succeeding each other at a rate of one second.
  • the start of the long pulse is offset by 40 ms with respect to 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 l . If an impulse is sent to the motor and it takes its step, i1 will find itself in position S 2 .
  • the value of the mutual flux magnet - coil 4j is shown 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 signals from the divider circuit 20 are applied to a circuit 21.
  • This circuit includes the short pulse generator 1, the long pulse generator 6 and the counter 7, as explained in FIG. 1.
  • the output voltage Um has either the shape presented in FIG. 2a, or the shape presented in FIG. 2c depending on whether the motor has taken its step or not.
  • Um is connected to the diagonal ab of a bridge of which one of the branches is occupied by the coil of the motor 22.
  • 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 about 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 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 crossed its pitch in response to a short pulse of 6 ms and for a well defined type of stepping motor.
  • Curve 1 was noted 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 volts. Note here the shift to the right of the current maxima when the torque increases (see publication cited DEOS 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 has been recorded 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.
  • curve 2 for a torque of 12 ⁇ 10-7 Nm
  • curve 3 for a torque of 15 ⁇ 10-7 Nm.
  • 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 sized for the servo that the present invention provides, an energy saving of the order of 60% has been measured.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Control Of Stepping Motors (AREA)
EP80103366A 1979-06-21 1980-06-18 Gangdetektionsschaltung für Schrittmotor Expired EP0021320B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057663A2 (de) * 1981-02-04 1982-08-11 Koninklijke Philips Electronics N.V. Steuervorrichtung für einen Schrittmotor
EP0097350A1 (de) * 1982-06-21 1984-01-04 Omega SA Speiseverfahren eines einphasigen Schrittmotors für eine Uhr
EP0024737B1 (de) * 1979-09-04 1984-02-01 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Detektor für die Fortbewegung eines Schrittmotors

Families Citing this family (9)

* 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
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
ES2115422T3 (es) * 1996-02-13 1998-06-16 Detra Sa Procedimiento y dispositivo de alimentacion de un motor paso a paso monofasico.
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 (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2220919A1 (de) * 1973-03-07 1974-10-04 Seiko Instr & Electronics
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
DE2854084A1 (de) * 1977-12-20 1979-06-21 Ebauches Electroniques Sa Anordnung zum nachholen von durch den schrittmotor eines zeitmessgeraetes nicht ausgefuehrten schritten

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH1372372A4 (de) * 1972-09-20 1976-09-15
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
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
GB2006995B (en) * 1977-09-26 1982-11-17 Citizen Watch Co Ltd Drive system for pulse motor
JPS5477169A (en) * 1977-12-02 1979-06-20 Seiko Instr & Electronics Ltd Electronic watch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2220919A1 (de) * 1973-03-07 1974-10-04 Seiko Instr & Electronics
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
DE2854084A1 (de) * 1977-12-20 1979-06-21 Ebauches Electroniques Sa Anordnung zum nachholen von durch den schrittmotor eines zeitmessgeraetes nicht ausgefuehrten schritten

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ACTES DU 10e CONGRES INTERNATIONAL DE CHRONOMETRIE", Vol. 3, 10-14 Septembre 1979 Buren CH A. PITTET et al.: "Amelioration de la fiabilite et de la consommation d'energie de moteurs pas a pas par une technique d'auto-controle", pages 73-80 * Page 78, paragraphes 4.2 et 4.3; figure 11 * *
PATENT ABSTRACTS OF JAPAN vol. 02, no. 127 25 October 1978 (1978-10-25) *
PATENT ABSTRACTS OF JAPAN vol. 02, no. 129 27 October 1978 (1978-10-27) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0024737B1 (de) * 1979-09-04 1984-02-01 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Detektor für die Fortbewegung eines Schrittmotors
EP0057663A2 (de) * 1981-02-04 1982-08-11 Koninklijke Philips Electronics N.V. Steuervorrichtung für einen Schrittmotor
EP0057663B1 (de) * 1981-02-04 1991-05-08 Koninklijke Philips Electronics N.V. Steuervorrichtung für einen Schrittmotor
EP0097350A1 (de) * 1982-06-21 1984-01-04 Omega SA Speiseverfahren eines einphasigen Schrittmotors für eine Uhr
US4542329A (en) * 1982-06-21 1985-09-17 Omega Sa Energizing method for a single phase timepiece stepping motor

Also Published As

Publication number Publication date
JPS6128315B2 (de) 1986-06-30
CA1164523A (en) 1984-03-27
EP0021320B1 (de) 1984-02-15
US4346463A (en) 1982-08-24
DE3066572D1 (en) 1984-03-22
JPS5631677A (en) 1981-03-31
FR2459579B1 (de) 1982-11-19
FR2459579A1 (fr) 1981-01-09

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