EP3748438A1 - Messung der präzision einer uhr, die einen kontinuierlich drehenden elektromechanischen transducer in ihrer analogen uhrzeitanzeigevorrichtung umfasst - Google Patents

Messung der präzision einer uhr, die einen kontinuierlich drehenden elektromechanischen transducer in ihrer analogen uhrzeitanzeigevorrichtung umfasst Download PDF

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Publication number
EP3748438A1
EP3748438A1 EP19178785.2A EP19178785A EP3748438A1 EP 3748438 A1 EP3748438 A1 EP 3748438A1 EP 19178785 A EP19178785 A EP 19178785A EP 3748438 A1 EP3748438 A1 EP 3748438A1
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EP
European Patent Office
Prior art keywords
digital signal
pulses
frequency
inhibition
signal
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EP19178785.2A
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English (en)
French (fr)
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EP3748438B1 (de
Inventor
Jean-Jacques Born
Laurent Nagy
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Swatch Group Research and Development SA
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Swatch Group Research and Development SA
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Priority to EP19178785.2A priority Critical patent/EP3748438B1/de
Priority to US16/854,041 priority patent/US11892807B2/en
Priority to JP2020085784A priority patent/JP6916928B2/ja
Priority to CN202010505160.7A priority patent/CN112051723B/zh
Publication of EP3748438A1 publication Critical patent/EP3748438A1/de
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Publication of EP3748438B1 publication Critical patent/EP3748438B1/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
    • G04C3/16—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating an electro-dynamic continuously rotating motor
    • 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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C10/00—Arrangements of electric power supplies in time pieces
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C11/00—Synchronisation of independently-driven clocks
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
    • G04F5/10—Apparatus for producing preselected time intervals for use as timing standards using electric or electronic resonators

Definitions

  • the invention relates to the field of measuring the precision of a timepiece comprising a watch movement which incorporates a continuously rotating electromechanical transducer, which is either arranged in the kinematic chain connecting a power source to an analog display time, or in kinematic connection with such a kinematic chain.
  • the invention relates to the measurement of the rate of such a watch movement, respectively of such a watch, and it also relates to the measurement of the precision of a quartz oscillator forming an internal electronic time base which allows to regulate the rotational speed of the rotor of the electromechanical transducer.
  • the daily time drift of the time displayed by the timepiece can also be given in the form of a daily time drift.
  • a daily time drift is measured relative to a very precise external time base which makes it possible to measure time intervals with very high precision.
  • the electromechanical transducer is formed respectively by a small generator in connection with the kinematic chain connecting a barrel, forming a source of mechanical energy, to an analog display of the time and by a continuously rotating motor which is powered by an electrical energy source and which drives, via a kinematic chain, an analog time display.
  • the electromechanical transducers considered in the context of the invention are generally reversible, so that they can either produce electrical energy from a source of mechanical energy while allowing regulation of the speed of rotation of the rotor. by braking this rotor in a controlled manner, or producing mechanical energy, more particularly motor torque, from an electrical supply. In the latter case, driving electric pulses can be supplied to the stator so as to ensure either a certain torque force, or a certain speed of rotation, in particular a nominal speed of rotation in a watch movement.
  • Such transducers are also sometimes called “electromagnetic transducers", since the rotor-stator coupling is of the electromagnetic type.
  • Such measuring devices can precisely determine the rate of the electromechanical watch given that the driving pulses are generated at regular time intervals, in particular every second, these time intervals being determined by the internal electronic time base, that is - that is to say by the crystal oscillator which is inhibited in a known manner to adjust the average frequency of this time base.
  • timepieces comprising an electromechanical transducer with continuous rotation in their movement, as explained previously, do not exhibit a perfectly periodic event which is detectable from the exterior of the timepiece by a measuring device of the type described above. Indeed, despite a regulation intended to control the average rotation speed of the electromechanical transducer with continuous rotation so that the displayed time is on average correct and that there is no long-term time drift, the speed of instantaneous rotation varying around the nominal rotation speed.
  • the measurement becomes even more problematic. It is therefore understood that there is a real need to find a method for measuring the rate of a finished watch, the time display mechanism of which is in kinematic connection with an electromechanical transducer with continuous rotation.
  • finished watch is understood to mean a watch in which the watch case is closed with the movement mounted inside.
  • the aim of the present invention is to provide a method of measuring the rate of a timepiece whose time display mechanism comprises a kinematic chain between a motor device and the time display which incorporates an electromechanical transducer with continuous rotation or which is in kinematic connection with such an electromechanical transducer with continuous rotation, taking into account that the speed of rotation of its rotor is generally variable even if it is regulated to be on average equal to a nominal rotational speed.
  • the invention generally relates to a method for measuring the average frequency of a digital signal which is derived from a periodic reference signal generated by an oscillator forming an electronic time base of a timepiece.
  • the timepiece comprises a movement incorporating a mechanism formed by a kinematic chain which is arranged between a device driving the movement and an analog time display device, this kinematic chain comprising or being kinematically connected to an electromechanical transducer to continuous rotation, the average rotation speed of which is regulated by a regulating device, associated with the electronic time base, according to a nominal rotation speed.
  • a continuously rotating motor it will be understood that it forms the aforementioned motor device.
  • the regulation device is arranged to supply the electromechanical transducer successively with regulation pulses to regulate its average speed of rotation, these regulation pulses respectively defining the same events which are synchronized on the rising edges or on the falling edges of said digital signal and which are detectable, by a measuring device without galvanic contact with the movement, at respective detection instants exhibiting the same time phase shift with said same events.
  • this quartz oscillator is normally manufactured so that its own daily error is positive, i.e. its natural frequency. or slightly higher than a theoretical reference frequency, without however exceeding a maximum daily error, for example fifteen seconds per day.
  • the digital signal is an inhibited digital signal which has periods of variable durations as a function of an inhibition of a certain number of periods of the periodic reference signal during successive inhibition cycles.
  • the movement is arranged so that the average frequency of the inhibited digital signal determines an advance of the indicator members of the analog time display device.
  • the inhibition is performed according to a method which distributes the inhibition of a certain number of periods of the periodic reference signal during each inhibition cycle.
  • the plurality of successive time intervals are provided such that the increase in the duration of any one of that plurality, resulting from the inhibition of one or more period (s) of the periodic signal reference during this time interval, ie at most equal to half of the theoretical average period of the inhibited digital signal.
  • the accuracy of the analog time display device is determined by calculating a relative error given by the result of dividing the difference between the average frequency of the inhibited digital signal, obtained in the above-mentioned step E), and the theoretical mean frequency, for this inhibited digital signal, by this theoretical mean frequency.
  • the running of the timepiece is obtained by multiplying the aforementioned relative error by the number of seconds in a day.
  • the measuring method of the invention is applicable to a timepiece whose electromechanical transducer is either a generator or a continuously rotating motor.
  • the kinematic chain 8 comprises , in the variant shown, a mobile 8A and a gear 8B, shown schematically, engaged with the time display device 12 comprising the hands 14A, 14B, 14C.
  • the generator 6 is formed by a rotor provided with permanent magnets and a stator comprising at least one coil through which passes a variable magnetic flux which is generated by the magnets of the rotor when the latter is rotating.
  • the stator 16 comprises a support 20 carrying three coils 22A, 22B and 22C arranged regularly around the axis of rotation 19 of the rotor and connected to an electronic circuit 24.
  • the rotor 18 comprises a central shaft 32 carrying two flanges 28A, 28B, preferably of ferromagnetic material, on each of which are regularly arranged, around the axis of rotation, six permanent magnets 30A and 30B having alternating polarities.
  • two adjacent magnets 30A and 30B of the same flange have reversed polarities, while two magnets 30A just like two magnets 30B, carried respectively by the two flanges and aligned in the direction of the axis of rotation. 19, have the same polarity.
  • the shaft 32 of the rotor carries a pinion 34 in engagement with the wheel of the mobile 8A.
  • the kinematic connection 9 is formed by the engagement of the pinion 34 with the wheel of the mobile 8A.
  • the movement 4 further comprises a plate 36 and a bridge 38 in which are respectively arranged two bearings 40A and 40B each provided with an anti-shock device and in which the rotor 18 is pivoted.
  • the electronic circuit 24 is connected to the terminals 44A and 44B of the coils of the stator 16.
  • a variable magnetic flux generated by the magnets of the rotor, passes through the coils and generates in each of them. they an induced alternating voltage.
  • the coils are three in number, that the magnets carried by each flange are six in number with alternating polarities, and that these magnets and these coils are arranged regularly around the axis of rotation of the rotor, the three Voltages induced respectively in the three coils are substantially in phase.
  • the three coils are arranged in series and the peak voltages are added substantially.
  • the three coils can be arranged in parallel.
  • the three coils together deliver, when the rotor is driven in rotation, an alternating voltage U 1 to the electronic circuit 24 which comprises a rectifier 46, which supplies a substantially continuous voltage U 1 * to a voltage regulator 48.
  • the voltage regulator provides a supply voltage U 2 to the electronic circuit, in particular to a circuit 50 for regulating the average speed of rotation of the rotor 18.
  • the regulation circuit 50 comprises a switch 52, formed by a transistor, which is controlled by a control unit 54.
  • the switch 52 is arranged between the two terminals 44A and 44B of the stator 16, so that when this switch is closed , that is to say on, these two terminals are electrically connected and the voltage U 1 is zero, the coils 22A - 22C of the stator then being short-circuited.
  • the switch is open, that is to say not conducting, the voltage U 1 is proportional to the voltage induced in the three coils by the magnets of the rotating rotor.
  • the average rotational speed of the generator 6 is regulated, as a function of a nominal rotational speed, by a regulating device formed by the regulating circuit 50.
  • the regulating circuit is associated with an electronic time base 25 which is formed by: - a quartz oscillator 26 which generates a periodic reference signal S PR , - a first frequency divider 60 which receives the periodic reference signal S PR and which supplies a periodic digital signal S DP whose frequency F DP is equal to the natural frequency F NR of the periodic reference signal S PR divided by a given whole number, for example two, and - a second frequency divider 62 which receives the signal S DP and which provides an inhibited digital signal S DI to a logic unit 64, which processes this inhibited digital signal to generate a clock signal S Ho .
  • the inhibited digital signal S DI is also supplied to the control unit 54.
  • the first divider and the second divider generally form the first two stages of a division unit which also forms at least a first part of the logical unit 64.
  • the manufacture of crystal oscillators does not allow a very precise natural frequency to be obtained, it is intended to produce crystal oscillators having a natural frequency greater than a theoretical reference frequency F RT , within a certain range of given frequency values.
  • the reference frequency theoretical F RT is equal to 32'768 Hz.
  • the frequency divider 60 is a divider by two, so that the theoretical frequency FT DP of the digital signal S DP is equal to 16'384 Hz and the period corresponding theoretical PT DP is equal to 1 / 16'384 second.
  • the daily error of uninhibited crystal oscillators is expected to be between one and twenty seconds.
  • the second frequency divider is associated with an inhibition unit 66 which, conventionally, inhibits a determined number of pulses in the digital signal S DP to correct a predetermined error of the crystal oscillator 26 resulting from manufacturing tolerances. and the fact that, as already indicated, the crystals are produced so as to have a too high natural frequency in a certain frequency range above a theoretical reference frequency F RT . Then, for each quartz oscillator produced, its natural frequency F NR is determined and a number of inhibitions per inhibition cycle is calculated, this number of inhibitions being introduced into the inhibition unit 66. In general, the inhibitions inhibitions are distributed over each of the successive inhibition cycles.
  • an inhibition cycle lasts 64 seconds and the determined number of inhibitions is divided by this number of seconds to obtain a unit number of inhibitions per second. This last number is a real number.
  • the number of unit inhibitions is added to a counter and the entire part of the result of the addition made by this counter is inhibited, then keeping only the part in the counter. fractional remaining.
  • the inhibitions carried out during the same second are not accumulated in the same period of the digital signal inhibited, but are distant by a certain unit time interval, for example by approximately 125 ms (1/8 second).
  • the clock signal S Ho determines a setpoint value for the frequency of the voltage induced in the coils, which corresponds to the frequency of the voltage signal U 1 .
  • This reference value is a function of the nominal speed of rotation of the generator and it is determined by the time base 25, so that it is affected by an error corresponding to that of the time base.
  • a voltage comparator 58 one input of which is connected to one of the terminals 44A, 44B and the other input to a reference voltage 59, generates a signal F UG which is supplied to a reversible counter 56 and to the control unit 54.
  • the signal F UG is a digital signal the period of which corresponds to the electrical period of the generator, that is to say to the period of the voltage induced in its stator and therefore of the voltage U 1 .
  • This signal F UG decrements the reversible counter 56 at each electrical period detected while the logic unit 64 increments this reversible counter at each period of the clock signal S Ho .
  • the reversible counter integrates, from an initial moment, a temporal drift of the generator and therefore of the analogue display of the time relative to a setpoint advance determined by the setpoint value which is derived from the inhibited digital signal supplied by the internal time base 25.
  • the state of the reversible counter is supplied to the control unit 54 which manages the average speed of rotation of the generator according to a given method.
  • the regulation circuit 50 is arranged to supply the generator successively with regulation pulses to regulate its average speed of rotation so that it is as close as possible to a nominal speed of rotation provided for the rotor of the generator.
  • the regulation pulses are formed here by braking pulses of the rotor of the generator which are each generated by a momentary short-circuit of the coil or coils forming the stator of this generator.
  • the nominal electric frequency of the AC voltage signal U 1 is that of the voltage induced in its three coils.
  • the nominal electrical period is 46.875 ms and the nominal duration of an alternation of signal U 1 is exactly equal to 23.4375 ms .
  • the measuring device 70 capable of implementing the measuring method according to the invention, by means of appropriate software, the content of which will become obvious on reading the detailed description of this measuring method.
  • the measuring device 70 comprises a detection coil 72 capable of detecting a variation in a magnetic field originating from the timepiece 2. In fact, a variation in the magnetic field generates an induced voltage in the detection coil.
  • the measuring device 70 can physically be an apparatus named 'Analyzer Twin' from the company Witschi Electronic SA in Büren in Switzerland, in which specific software is implemented for the implementation of the measurement method according to invention.
  • Other similar measuring devices for electronic watches can also be used. Indeed, it is not useful that the measuring device can also be used for mechanical watches, as is the case with the 'Analyzer Twin' model.
  • the measurement method according to the invention provides for measuring, in particular for a timepiece 2 such as a wristwatch or for a movement 4 ready to be fitted, the average frequency of a digital signal internal to the electronic circuit of the movement 4, this digital signal being derived from the periodic reference signal S PR generated by the quartz oscillator 26 forming the electronic time base 25 of this movement 4.
  • a regulation circuit associated with the electronic time base, according to a nominal rotation speed.
  • the regulator device is designed to be able to supply the generator with successively braking pulses by short-circuiting the terminals 44A and 44B of the coils of the stator 16 of the generator to regulate its average speed of rotation.
  • control signal Scom goes from its logic state '0' (switch open) to its logic state '1' (switch closed and therefore on) on the first rising edge of the inhibited digital signal S DI , received by the control unit to temporally manage the braking pulses, following the considered edge of the signal F UG .
  • the regulation pulses respectively define the same events which are synchronized on the rising edges or on the falling edges of the inhibited digital signal S DI and which are detectable, by a measuring device without galvanic contact with the movement and preferably by a magnetic field sensor 72, at corresponding detection instants.
  • this event is the end of each braking pulse.
  • the BP n braking pulses are identified in the figures either by corresponding control pulses of the control signal S Com ( Figures 5A and 5B ), or by the extended areas (that is to say non-point) of the voltage U1 where the latter has a zero value ( Figure 6 ), resulting from the control pulses.
  • the BP n braking pulses have T BPn braking times .
  • the signal S DI has an average frequency FM DI which is, over an inhibition cycle, slightly less than a quarter of the average frequency FM DP of the periodic digital signal S DP .
  • the inhibited digital signal S DI is derived from the S DP signal with the application of the inhibition provided to correct the relative error of the crystal oscillator.
  • the periodic digital signal S DP is divided twice by two in the divider 62 by applying the inhibition during the first of these two divisions by two successive ones.
  • Figure 6 a fictitious inhibited signal S FI having, outside the periods undergoing inhibition, the frequency of the signal S DP .
  • the period P DI of the signal S DI is exactly four times the period P DP of signal S DP .
  • a period P DP of this signal is inhibited, i.e. it is ignored and therefore not taken into account. count, so that the period P DI * of the signal S DI generated during this inhibition is greater than that of the period P DI , since the period P DI * in fact has a duration equal to five times the period P DP .
  • P DI * 1.25 ⁇ P DI (+ 25%).
  • the inhibited digital signal S DI is therefore characterized by an average frequency FM DI and an average period PM DI .
  • the clock signal S Ho is determined by the signal S DI and this clock signal determines a setpoint value for the frequency of the voltage induced in the coils of the generator
  • the signal S DI there is provided for the signal S DI a theoretical mean frequency FMT DI and a corresponding theoretical mean period PMT DI which are functions respectively of the nominal electric frequency and of the nominal electric period of the voltage U 1 (which are equal to those of the induced voltage).
  • the frequency F DP of the periodic digital signal S DP can also vary slightly, so that on an inhibition cycle C lnh and also over the total measurement time T Mes the signal S DP has a frequency average FM DP and a corresponding average period PM DP .
  • the theoretical frequency FT DP is, by construction of the oscillator of the time base, lower than the average frequency FM DP .
  • the natural frequency F NR of the periodic reference signal S PR also presents, over an inhibition cycle or a total duration of measurement, an average natural frequency FM NR which is equal to double the average frequency FM DP of the signal S DP .
  • two comparators are provided in parallel which detect, on the rising edge of these pulses, the instant when the induced voltage reaches a threshold voltage Us or -U S respectively for the positive and negative pulses which follow one another alternately, given that the braking pulses are carried out at each alternation of the voltage U 1 at the terminals of the stator 16 of the generator 6. It will be noted that the instants of detection have the same small time phase shift with the respective ends of the corresponding braking pulses.
  • the digital signal is the periodic digital signal S DP , the average frequency FM DP of which is equal to the average natural frequency FM NR , over the total measurement time T Mes , of the divided reference periodic signal S PR. by a given whole number, for example by two.
  • ER (S DP ) (FM DP - FT DP ) / FT DP .
  • the digital signal is therefore the inhibited digital signal S DI which has periods P DI and P DI * of varying durations as a function of an inhibition of a certain number of periods of the periodic reference signal during successive inhibition cycles.
  • the total measurement duration T Mes therefore corresponds to a period of time without interruption between an initial instant tfo and a terminal instant tf N.
  • This advantageous variant is optional for the measurement of the average frequency of the periodic digital signal S DP , but it is preferable for the inhibited digital signal S DI because the inhibitions do not generally occur at each time interval TI n and these inhibitions are not not necessarily distributed in a perfectly homogeneous manner over time.
  • the total measurement duration T Mes is expected to be very slightly greater than the duration of an inhibition cycle C Inh which is here theoretically 64 seconds.
  • the last time interval TI N corresponds to the time interval, between two ends tf N-1 and tf N of braking pulses, during which the end of a time measurement of a cycle d occurs.
  • 'inhibition C Inh from the final instant tf 0 of an initial braking pulse BPo, this instant tfo being selected as the start of the measurement.
  • the temporal measurement of an inhibition cycle is also carried out by the measuring device which comprises or is associated with a very precise external time base, for example an atomic time base.
  • the nominal electric frequency of the voltage signal U 1 is equal to 64/3 Hz.
  • the nominal electric period is therefore equal to 46.8750 milliseconds.
  • the nominal duration of a half-wave of the voltage signal U 1 is 23.4375 ms.
  • 2731 vibrations at this nominal duration gives a total duration slightly greater than 64 s, i.e. 64.0078125 s.
  • the nominal integers M n are even numbers in the absence inhibition during corresponding time intervals TI n and odd numbers when an inhibition occurs during the corresponding time intervals (at most one inhibition per time interval is provided in the variant described here).
  • NT IC 110.112 is obtained.
  • a braking pulse is provided for each period of the voltage U 1 , so that only the positive induced voltage pulses DE 2n-1 or only the negative induced voltage pulses DE 2n appear (see Figure 5A ), depending on whether the braking pulses are applied during rising edges or falling edges of the voltage signal U 1 , and they are detected using a single voltage comparator with the threshold voltage U S , respectively - U S.
  • the theoretical average duration of the time intervals is then equal to 46.8750 ms.
  • the first condition imposes a maximum duration on the measured time intervals TI n .
  • the measurement of the plurality of successive time intervals TI n in step A) is carried out so that each is less than a maximum duration TI Max which is equal to the theoretical average period for the digital signal considered divided by the double of the maximum relative error ER Max for the natural frequency F NR of the periodic reference signal S PR relative to the theoretical reference frequency F RT , i.e.
  • TI MAX (S DP ) PT DP / 2 ER Max (F NR ) for the measurement of the average frequency FM DP of the periodic digital signal S DP
  • TI Max (S DI ) PMT DI / 2 ER Max (F NR ) for the measurement of the average frequency FM DI of the inhibited digital signal S DI .
  • the theoretical duration of one half-wave of signal U 1 is equal to 23.4375 ms, so that at least one braking pulse is needed every five half-waves to precisely measure the average frequency of the oscillator, respectively at least one braking pulse every twenty-two vibrations to measure precisely, in the absence of inhibition during at least one of the time intervals TI n , the average frequency of the inhibited digital signal and therefore the progress of the timepiece.
  • the second condition relates to the maximum number of inhibitions that can occur during each time interval TI n .
  • the plurality of 'successive time intervals are provided so that the increase in the duration of any one of this plurality of times, resulting from the inhibition of one or more period (s) of the periodic reference signal during this time interval, ie at most equal to half of the theoretical mean period PMT DI of the inhibited digital signal (it being understood that a number equal to an integer and a half is rounded off to this integer).
  • these are periods of the periodic digital signal S DP which are inhibited.
  • the period P DP of the signal S DP is practically less than the theoretical period PT DP , there is a certain margin by limiting the inhibitions per measured time interval to two inhibitions.
  • the second condition is advantageous for ensuring high measurement accuracy in all cases, but it is not necessary in all cases.
  • a mode of the inhibition method which distributes the inhibitions during an inhibition cycle according to a substantially uniform pattern, for example by distributing the number of inhibitions as best as possible in sub-periods of the cycles of inhibition and by avoiding performing in these sub-periods more than two pulses in a short period of time, one could have more than two inhibitions per time interval if the time intervals TI n are, alternatively, long enough.
  • a braking pulse every half-wave as in the variant described above, it is observed that the maximum number of inhibitions during each half-cycle is indeed equal to two.
  • the third condition for guaranteeing high measurement precision concerns the total measurement time T Mes to measure the average frequency of the inhibited digital signal and the operation of the timepiece.
  • conventional inhibition methods provide for the distribution of inhibitions during each cycle of inhibition.
  • the inhibitions of which the maximum whole number per inhibition cycle is 255 or 511, are distributed per second.
  • An inhibition cycle theoretically lasts 64 [s].
  • an integer number of inhibitions is performed, corresponding to the integer value of the total number of planned inhibitions divided by 64, and an additional inhibition corresponding to the period is added periodically. summation of fractional parts over seconds, whenever this summation exceeds unity.
  • the total measurement duration T Mes encompasses as closely as possible a cycle d 'inhibition to be sure that all the inhibitions predicted for an inhibition cycle have occurred during the plurality of time intervals TI n measured.
  • the time intervals are determined by the braking pulses which depend in particular on the variable speed of rotation of the generator, it is practically not possible to obtain a total measurement time T Mes equal to exactly one cycle d 'inhibition. Consequently, in a preferred variant, provision is made to terminate the measurements of the time intervals at the first braking pulse following a period of time corresponding to an inhibition cycle.
  • T Mes C Inh + T add .
  • T add 125 ms.
  • control signal S Com the voltage signal U 1 and the voltage signal U Det detected by the measuring device in an implementation of the measuring method according to the invention for a second mode of regulation of the average rotation speed of electromechanical transducer in which the regulating device is arranged to generate the regulating pulses BP n so that any two successive regulating pulses have between their respective starts td n approximately a positive integer number of alternations of a generated induced voltage signal by the variable magnetic flux in the stator, formed by at least one coil, when the rotor of the electromechanical transducer is rotating.
  • the regulation pulses In the second regulation mode, the regulation pulses have, at least over a certain regulation period, substantially the same duration and the regulation of the average speed of rotation of the rotor during this regulation period is obtained by a variation of the positive integer number of the aforementioned alternations between the regulation pulses. Otherwise, the measurement method remains similar to that explained above for the first regulation mode and the three conditions described above also apply.
  • a timepiece provided with a generator, it will be understood that it is preferable to implement the measurement method when the barrel which drives this generator is wound up, so that the force torque is relatively high and it is then necessary to perform enough braking pulses to regulate the rotational speed of the generator.
  • the electromechanical transducer is thus a continuously rotating motor forming the motor device of the watch movement.
  • This motor is formed by a rotor provided with permanent magnets and a stator comprising at least one coil through which passes a variable magnetic flux which is generated by the magnets of the rotor when the latter is rotating.
  • the regulation pulses are driving pulses which are each generated by a momentary power supply to said at least one stator coil.
  • the switch 52 of the regulation circuit is then arranged between an electrical terminal of the stator and a terminal of the electrical supply capable of delivering a certain supply current to the coil.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromechanical Clocks (AREA)
  • Electric Clocks (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
EP19178785.2A 2019-06-06 2019-06-06 Messung der präzision einer uhr, die einen kontinuierlich drehenden elektromechanischen transducer in ihrer analogen uhrzeitanzeigevorrichtung umfasst Active EP3748438B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP19178785.2A EP3748438B1 (de) 2019-06-06 2019-06-06 Messung der präzision einer uhr, die einen kontinuierlich drehenden elektromechanischen transducer in ihrer analogen uhrzeitanzeigevorrichtung umfasst
US16/854,041 US11892807B2 (en) 2019-06-06 2020-04-21 Measurement of the precision of a timepiece comprising a continuous rotation electromechanical transducer in the analogue time display device thereof
JP2020085784A JP6916928B2 (ja) 2019-06-06 2020-05-15 計時器のアナログ時間表示デバイス内に連続回転電気機械変換器を備える計時器の精度の測定
CN202010505160.7A CN112051723B (zh) 2019-06-06 2020-06-05 包括连续旋转机电换能器的时计的精度的测量

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Application Number Priority Date Filing Date Title
EP19178785.2A EP3748438B1 (de) 2019-06-06 2019-06-06 Messung der präzision einer uhr, die einen kontinuierlich drehenden elektromechanischen transducer in ihrer analogen uhrzeitanzeigevorrichtung umfasst

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EP3748438A1 true EP3748438A1 (de) 2020-12-09
EP3748438B1 EP3748438B1 (de) 2022-01-12

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EP3748438B1 (de) * 2019-06-06 2022-01-12 The Swatch Group Research and Development Ltd Messung der präzision einer uhr, die einen kontinuierlich drehenden elektromechanischen transducer in ihrer analogen uhrzeitanzeigevorrichtung umfasst

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EP0679968A1 (de) 1994-04-25 1995-11-02 Asulab S.A. Uhr mit mechanischem Antrieb und mit elektronischer Steuerung
EP0806710A1 (de) * 1996-05-07 1997-11-12 Asulab S.A. Stabilisation einer elektronischen Schaltung zur Regelung des mechanischen Gangwerks einer Zeitmessvorrichtung
EP0822470A1 (de) 1996-08-01 1998-02-04 Asulab S.A. Elektronisches Uhrwerk, das einen Generator enthält, der von einer Zugfeder getrieben wird
EP0887913A2 (de) 1997-06-24 1998-12-30 Asulab S.A. Verfahren zur Steuerung eines Mikromotors mit konstanter Drehzahl
EP0935177A1 (de) 1998-02-09 1999-08-11 Asulab S.A. Elektronisches Uhrwerk, mit von einer Zugfeder angetriebenem Generator
WO2000063749A1 (de) 1999-04-21 2000-10-26 Conseils Et Manufactures Vlg Sa Uhrwerk mit einem mikrogenerator und testverfahren für uhrwerke
EP1099990A1 (de) 1999-11-12 2001-05-16 Asulab S.A. Generator für Zeitmessgerät
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EP3748438B1 (de) 2022-01-12
JP6916928B2 (ja) 2021-08-11
CN112051723A (zh) 2020-12-08
US20200387114A1 (en) 2020-12-10
US11892807B2 (en) 2024-02-06
JP2020201246A (ja) 2020-12-17
CN112051723B (zh) 2021-12-17

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