EP3944027A1 - Tragbares gerät, insbesondere armbanduhr, das mit einer stromquellevorrichtung mit einem elektromechanischen wandler ausgestattet ist - Google Patents

Tragbares gerät, insbesondere armbanduhr, das mit einer stromquellevorrichtung mit einem elektromechanischen wandler ausgestattet ist Download PDF

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Publication number
EP3944027A1
EP3944027A1 EP20187004.5A EP20187004A EP3944027A1 EP 3944027 A1 EP3944027 A1 EP 3944027A1 EP 20187004 A EP20187004 A EP 20187004A EP 3944027 A1 EP3944027 A1 EP 3944027A1
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EP
European Patent Office
Prior art keywords
rotor
permanent magnet
mechanical resonator
portable object
magnets
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
EP20187004.5A
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English (en)
French (fr)
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EP3944027B1 (de
Inventor
M. Milan CALIC
Matthias Imboden
M. Jean-Pierre MIGNOT
M. Alain Jornod
M. François GUEISSAZ
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Swatch Group Research and Development SA
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Swatch Group Research and Development 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.)
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Application filed by Swatch Group Research and Development SA filed Critical Swatch Group Research and Development SA
Priority to EP20187004.5A priority Critical patent/EP3944027B1/de
Priority to JP2021102164A priority patent/JP7181348B2/ja
Priority to CN202110834117.XA priority patent/CN113960912B/zh
Publication of EP3944027A1 publication Critical patent/EP3944027A1/de
Application granted granted Critical
Publication of EP3944027B1 publication Critical patent/EP3944027B1/de
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Anticipated expiration legal-status Critical

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    • 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
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/08—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically
    • G04C3/10—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by electromagnetic means
    • 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
    • G04C3/04—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance
    • G04C3/06—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance using electromagnetic coupling between electric power source and balance
    • G04C3/064—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance using electromagnetic coupling between electric power source and balance the balance controlling indirectly, i.e. without mechanical connection, contacts, e.g. by magnetic or optic means
    • 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
    • G04C3/08—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically
    • G04C3/10—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by electromagnetic means
    • G04C3/101—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by electromagnetic means constructional details
    • 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

Definitions

  • the invention relates to portable objects, in particular portable objects on the wrist such as watches, which incorporate an electronic unit and an electrical power supply unit for supplying power to at least this electronic unit. More particularly, the invention relates to so-called autonomous portable electronic devices, which are provided with an electric power supply unit which draws energy from an internal mechanical device, in particular from a generator associated with a source of internal mechanical energy (for example a barrel whose spring is wound automatically by a rotor or manually), or from at least one sensor receiving energy from the environment of the portable electronic device or from a user wearing this electronic device.
  • a generator associated with a source of internal mechanical energy (for example a barrel whose spring is wound automatically by a rotor or manually)
  • at least one sensor receiving energy from the environment of the portable electronic device or from a user wearing this electronic device.
  • the movement of the wrist constitutes a source of mechanical energy which can be exploited to power a wristwatch. This has been exploited for a very long time in automatic mechanical watches. More recently, those skilled in the art have thought of using the mechanical energy of a rotor to supply electricity to at least one electronic unit of a wristwatch of the electromechanical or electronic type. To this end, various types of electromechanical converters have been proposed. In particular, the use of electromagnetic induction has proven successful. Mention may be made of two known types of autonomous watches having an electronic unit. The first type is described in particular in the patent application EP 822 470 , in the name of Asulab.
  • an electromechanical watch comprising an electromechanical generator incorporated in a gear train of the watch movement and having two functions, namely a function for regulating its rotation frequency and an electromechanical converter function to be able to supply the electronic circuit of regulation.
  • the second type is described in particular in the patent application EP 1 239 349 and WO 9204662 , on behalf of KINETRON.
  • a particular embodiment is described in the patent application EP 1 085 383 , on behalf of ETA SA Manufacture Horlogère Suisse.
  • the rotor serves only to drive an electromechanical generator which supplies electricity to an accumulator incorporated in the watch of the electronic type.
  • the hands are driven by an electric motor, in particular step-by-step, which is powered by the accumulator.
  • the aforementioned embodiments have a factor limiting their performance, in particular because of energy losses due to friction in the gear trains.
  • at least one intermediate multiplier mobile and/or a complex device allowing a barrel to restore the accumulated mechanical energy by pulses are necessary.
  • Another approach to harvest kinetic energy in a watch is to implement a rotor equipped with magnets in its peripheral part, with fixed coils integrated on a PCB above which the rotor magnets pass. When the rotor is driven, a voltage is then induced in the coils due to the variation of the magnetic flux.
  • a disadvantage of this approach is that the rotor rotates relatively slowly (typically with an average rotational speed between 1 and 5 rpm), which limits the energy conversion efficiency due to the low induced voltages that are generated.
  • the object of the invention is to provide a portable device provided with an electronic unit and a power supply unit comprising an electromechanical converter having good efficiency, in particular by supplying a relatively high voltage before any possible voltage booster.
  • the electromechanical converter is arranged in such a way that said at least one first permanent magnet and said at least one second permanent magnet can, when the rotor is driven in rotation, interact magnetically so as to apply to the inertial mass, momentarily or at times, a couple of magnetic force making it possible to excite the mechanical resonator, in order to generate at least one oscillation of this mechanical resonator substantially at its resonant frequency.
  • said at least one first permanent magnet and said at least one second permanent magnet are located in the same general plane, perpendicular to the axis of oscillation of the mechanical resonator, and arranged so that their magnetic interaction is in repulsion.
  • the center of said second permanent magnet and the center of said coil when the mechanical resonator is at rest, have between them an angular offset, relative to the axis of oscillation of the mechanical resonator, which is non-zero and which preferably corresponds to an angular positioning of the center of the second permanent magnet substantially at a point of inflection of the curve of the magnetic flux, generated by said at least one second permanent magnet and passing through the coil, as a function of the relative angular position between the second permanent magnet and the coil.
  • This portable object is a wristwatch 2 comprising an electronic unit (incorporated in the watch movement 4) and an electrical power supply unit.
  • the power supply unit is formed by an electromechanical converter 6 which transforms energy mechanism of a rotor 8 into electrical energy which is stored in an electric accumulator, which supplies the electronic unit.
  • the rotor is capable of being driven in rotation by movements that the watch may undergo, in particular when it is worn on the wrist of a user.
  • said at least one second permanent magnet 20 and said at least one coil 24 are arranged so that, when the mechanical resonator 12 is at rest, at least part of the magnetic flux generated by said second permanent magnet passes through the coil. so that when the mechanical resonator is oscillating, an induced voltage (U Ind ) is generated in this coil.
  • the electromechanical converter 6 is arranged in such a way that said at least one first permanent magnet and said at least one second permanent magnet can, when the rotor is driven in rotation, interact magnetically so as to apply to the inertial mass, momentarily or at times, a couple of magnetic force making it possible to excite the mechanical resonator, in order to generate at least one oscillation of this mechanical resonator substantially at its resonant frequency.
  • each 'magnet' By 'an oscillation' is meant an oscillatory movement for at least one period of oscillation and therefore having at least two alternations.
  • 'alternation' each movement of the mechanical resonator between two extreme angular values which define its amplitude of oscillation.
  • the magnets 20 and the coils 24 are arranged so that, when the mechanical resonator 12 is at rest, these magnets and these coils are respectively aligned radially, in axial projection in a general plane of the mechanical resonator, relative to the axis of oscillation 14.
  • each magnet 20 and the corresponding coil 24 are aligned axially.
  • the center of each second magnet 20 and the center of the respective coil 24 have between them a non-zero angular offset relative to the axis of oscillation of the mechanical resonator.
  • the angular offset provided corresponds to an angular positioning of the center of each second magnet approximately at a point of inflection of the curve of the magnetic flux, generated by this second magnet and crossing the respective coil, as a function of the relative angular position between this second magnet and this coil relative to the axis of oscillation of the mechanical resonator.
  • This preferred variant makes it possible to increase significantly the induced voltage produced in each of the coils, in particular when the amplitude of oscillation of the mechanical resonator after each excitation of the latter is relatively small, for example of the order of the half-angle at the center of the magnets 20.
  • the mechanical resonator 12 is a resonator with flexible blades 26, these flexible blades carrying the mass of inertia 16 and connecting the ring forming this mass of inertia to a central element 28 which is fixed to the support of the mechanical resonator, that is i.e. which is integral to the watch movement.
  • the central element is held fixed by a central screw between a projecting part of a fixed central part of the rotor 8 and a nut screwed onto the central screw.
  • This variant is given by way of simplified example. Those skilled in the art will know how to design various means for fixing the mechanical resonator to the watch movement, so as to ensure in particular good stability of the central element 28. It will be noted that this central element can be connected to the watch movement 4, or to a another support integral with this one, independently of the central part of the rotor 8.
  • the rotor 8 is similar to a winding mass of an automatic mechanical movement.
  • the rotating part of the rotor is mounted on a fixed central part by means of a ball bearing.
  • this first embodiment has the advantage of allowing synergy in the case where the watch movement is of the mechanical type, the rotor 8 can then be used to activate the mechanical resonator, as will be explained later, and also to simultaneously wind a barrel of the mechanical movement.
  • the electronic unit which is powered by the power supply unit according to the invention has a function other than that of displaying the current time.
  • the rotor and the mechanical resonator are arranged with their respective central axis located at the center of the watch movement. However, in a variant, these mechanisms are arranged off-center relative to the central axis of the watch movement.
  • the electromechanical converter 6 is arranged at the rear of the watch movement 4, on the side of the bottom of the watch case 32 and therefore on the side opposite the dial 34 relative to the movement 4 which is here an electromechanical movement with an analog display of the time.
  • this movement comprises a motor, in particular a stepper motor.
  • the first embodiment is characterized in particular by the fact that the rotor 8 is mounted free to rotate on a central part which is fixed, according to various variants, either to the fixed central element 28, or directly to the watch movement 4 or possibly to an internal device which is integral with this central element or with this watch movement and which is located on the other side of the mass of inertia 16 relative to the rotor, namely on the side of the analog display in the case of the watch 2.
  • the rotor is configured in such a way as to present an imbalance to favor its rotation during the movements which the watch may undergo.
  • the rotor has a peripheral part which extends over an angle of approximately 200° and carries the two magnets 10 in two internal cavities which open laterally inwards, these two magnets emerging from the peripheral part of the rotor towards the mass of inertia 16 of the mechanical resonator.
  • the first magnets 10 and the second magnets 20 are located in the same general plane which is perpendicular to the central axis 14 defining the axis of oscillation of the mechanical resonator 12 and the axis of rotation of the rotor 8, which coincide.
  • the purpose of this characteristic is to avoid the appearance of an axial force on the inertial mass of the mechanical resonator and consequently also on the rotor.
  • the first magnets 10 and the second magnets 20 are arranged so that their magnetic interaction is in repulsion. In an advantageous variant, they all have axes of magnetization substantially parallel to the central axis 14.
  • first magnets 10 and also an even number of second magnets 20, each pair of first magnets and each pair of second magnets being arranged in a diametrically opposite manner relative to the central axis 14
  • the purpose of this characteristic is to avoid the appearance of an overall radial force on the mass of inertia of the mechanical resonator and consequently also on the rotor.
  • each second magnet 20 is replaced here by a pair of second magnets having the same polarity and aligned axially with a coil 24 located between these two magnets, preferably at the same distance from each of them. Since the two magnets of each pair of magnets attract each other magnetically, it is advantageous, even necessary, for the two magnets of each of the pairs of second magnets to be rigidly assembled.
  • the first magnets 10 are advantageously located in a general plane in which the coils 24 are located.
  • the first magnets 10 carried by the rotor are doubled so as to have pairs of first magnets of same polarity replacing each first magnet 10 of the two variants shown.
  • this last variant allows an axial arrangement of the pairs of first magnets with the second magnets, that is to say that the first magnets and the second magnets have substantially the same radius at the central axis, defining the axis of oscillation of the mechanical resonator and the axis of rotation of the rotor, without an axial magnetic force being exerted on the mass of inertia.
  • the number of sinusoidal pulses generated in each coil is equal to twice the resonant frequency F Res as long as the mechanical resonator oscillates freely.
  • FIG. 2A and 2B is shown a second alternative embodiment of a wristwatch 2A according to the first embodiment.
  • the mechanical resonator is identical to that of the first variant.
  • This second variant differs from the first variant in that the rotor 8A carries six magnets 10, that is to say the same number as that of the magnets 20 which are carried by the inertial mass 16. Like the six magnets 10 are regularly distributed along the peripheral part 38 of the rotor, this peripheral part extends over a complete turn (360°). The peripheral part thus forms an annular part which laterally surrounds the mass of inertia 16 of the mechanical resonator. In order to keep the rotor unbalanced, three openings 36 are machined in the rotor plate.
  • each magnet 10 has an identical magnetic coupling with the magnets 20 so that the torques of force generated between each of the magnets 10 and the magnets 20 are added.
  • the Figure 2B shows the predicted global magnetic system according to the invention, namely the magnets 10 carried by the rotor and serving to activate the mechanical resonator, the magnets 20 carried by the oscillating mass of inertia 16 of the mechanical resonator, and the coils 24 mounted on a PCB 22 of so as to be opposite the magnets 20 when the mechanical resonator passes through its rest position.
  • the flexible blades 26 of the mechanical resonator are made of a piezoelectric material and each coated with two electrodes through which an electric current is generated when the mechanical resonator is activated, this electric current also being supplied to an accumulator as includes watch power supply unit 2 or 2A.
  • a second embodiment of a watch 42 comprising an electromechanical converter 6A according to the invention is shown in Figures 3A to 3C .
  • This second embodiment differs from the first embodiment substantially by the arrangement of the rotor 44 and by the arrangement of the mechanical resonator 12A.
  • the mechanical resonator comprises an inertia mass 46 and a resonant structure 48 mounted on a projecting part 4A of the watch movement 4.
  • the inertia mass defines a wheel which is formed by an outer ring, similar to that provided in the first embodiment and carrying four magnets 20 distributed regularly, a central part and radial arms which connect the outer ring to this central part.
  • the central part is firmly connected to an oscillating part of the resonant structure 48 with flexible blades which is located in a general plane lower than that of the mass of inertia.
  • the resonant structure is of a type which is described in the patent application EP 3 206 089 .
  • the radial arms of the mass of inertia are respectively rigid and semi-rigid.
  • the semi-rigid variant makes it possible to absorb sudden accelerations of the inertia mass resulting in particular from shocks that the watch may suffer.
  • Four coils 24 are arranged on a PCB 22 so as to have an angular offset with the four corresponding magnets 20 when the mechanical resonator 6A is in its angular position of rest, according to an advantageous variant which has been explained in the context of the first embodiment.
  • the rotor 44 is mounted free in rotation on a fixed structure of the portable object, advantageously on the middle part of the case 32 of the watch as in the variant shown or preferably on a casing circle of the watch movement 4, by means of a ball bearing 50.
  • a ball bearing 50 To release the central zone of the rotor under which the resonant structure 48 is located, an inner ring 51 of the ball bearing 50 is advantageously formed by the rotor or secured to this rotor, while an outer ring 52 of this bearing is formed by said fixed structure or secured to this fixed structure.
  • the raceway of the inner ring 51 is formed by an outer side surface of the rotor 44.
  • the ball bearing 50 is located at the periphery of the rotor 44.
  • the rotor 44 is formed by an annular part carrying four magnets 10A and it is arranged in the same general plane as the inertia mass 46 of the mechanical resonator and the ball bearing 50.
  • the rotor and the mechanical resonator are advantageously coplanar to limit the increase in thickness of the case 32 of the watch 42 generated by the arrangement of the electromechanical converter according to the invention in this watch.
  • this assembly is also provided here coplanar with the ball bearing.
  • the ball bearing is arranged under the annular part of the rotor, on the side of the watch movement 4.
  • the magnets 10A of the rotor are the same number as that of the magnets 20 of the mass of inertia 46 of the mechanical resonator 12A.
  • the magnets 10A and 20 are advantageously arranged in the same general plane. In the variant shown, these magnets are inserted into respective openings of the annular part of the rotor and of the inertial mass, so that they are arranged in the general plane in which this annular part and this mass of inertia.
  • the magnets 10A and 20 have axial axes of magnetization and a magnetic interaction in repulsion.
  • the magnets 10A, respectively 20 are arranged in diametrically opposed pairs.
  • the mass of inertia is only subjected to a torque of magnetic force in the general plane in which the magnets 10A and 20 are arranged (in other words, the vector of this magnetic torque is axial, coinciding with the axis of oscillation 14 of the mechanical resonator 12A).
  • the annular part of the rotor 44 has two openings making it possible to generate an unbalance.
  • the operation of the electromechanical converter of the second embodiment will be described more precisely and more particularly the activation of the mechanical resonator 12A by the rotor 44.
  • the rotor is represented only by the magnets 10A.
  • the electromechanical converter of the first embodiment operates similarly to the electromechanical converter of the second embodiment.
  • the rotor is substantially stationary and the mechanical resonator 12A is stationary in its rest position. From this initial position of the electromechanical converter, the rotor with its magnets 10A rotate counterclockwise at a substantially constant speed, after an initial acceleration resulting for example from a sudden movement of the arm of a user of the watch 42.
  • the four magnets 10A of the rotor have approached the four magnets 20 of the mechanical resonator. A magnetic interaction occurs between each magnet 10A and a corresponding magnet 20. A magnetic repulsion force F RM is then exerted on each of the magnets 20 and a first strong magnetic coupling occurs.
  • the magnetic repulsion force F RM increases further in intensity when the magnets 10A come even closer to the respective magnets 20, but it is mainly the radial component which increases so that the magnetic force torque exerted on the mass of inertia passes through a maximum for a relative angular position of the magnets 10A and the magnets 20 which is shown in Figure 4C .
  • the new strong magnetic coupling can generate various variants of magnetic interaction and thus act according to various scenarios on the mechanical resonator. These various scenarios depend in particular on the fact that the mechanical resonator rotates in the same direction of rotation as the rotor at the start of a new strong magnetic coupling or, on the contrary, that the respective rotations of the rotor and of the mechanical resonator are then of direction opposites. In the first case, the new strong magnetic coupling will serve for the most part to maintain the first oscillation generated during the first strong magnetic torque.
  • the new strong magnetic coupling slows down the inertial mass and therefore substantially dampens the first oscillation, then secondly generates a second oscillation, mainly by the magnetic force couple in the opposite direction to that of the rotor which intervenes after the magnets of the rotor have angularly exceeded those of the mass of inertia. It will be noted that because the resonance frequency is relatively high, the second case is predominant.
  • the mass of inertia often passes through a short time of stopping or of quasi immobility (not necessarily at the position of rest, because also possible in other angular positions and in particular close to an extreme angular position of the oscillating mechanical resonator) generating a time phase shift in the oscillatory movement of the mechanical resonator.
  • sustained oscillation and succession of oscillations is not clear.
  • the mechanical resonator stops for a certain interval of time in its rest position we can speak of two successive oscillations, and in the opposite case we can then speak of the maintenance of an oscillation in progress, often with the introduction of a temporal phase shift. Be that as it may, a plurality of successive momentary oscillations can be observed between the successive strong magnetic couplings substantially at the resonance frequency F Res .
  • the electromechanical converter is arranged so that the magnetic force torque applied to the inertial mass by the rotor makes it possible to generate, during rotational driving of the rotor over an angular distance greater than l central angle between two adjacent magnets 20 of the mechanical resonator, a plurality of successive momentary oscillations, at the resonance frequency F Res and with an amplitude substantially equal to or greater than a minimum amplitude for which the voltage induced in each coil of the system magnetic, associated with the mechanical resonator, is substantially equal to a predetermined threshold voltage, this plurality of successive momentary oscillations occurring following a plurality of respective momentary rotation drives of the inertial mass of the mechanical resonator by the rotor allowing respectively generating the plurality of successive momentary oscillations.
  • each coil 24 has a diameter of 4 mm, a height of 0.4 mm, 2300 turns and a resistance of 2.6 K ⁇ .
  • Each coil is fixedly arranged at an axial distance of 0.1 to 0.2 mm under the respective magnets 20 of the mechanical resonator, which are chosen with strong remanent magnetization and have an approximately identical diameter. to that of the coils.
  • the magnetic system described here, associated to the mechanical resonator can generate an average power of the order of 2 ⁇ W per coil on an impedance matched load and an average induced voltage of the order of 100 mV per coil. Note that higher performance is possible.
  • the Figure 9 is an electrical diagram of an alternative embodiment of an electronic circuit of the electromechanical converter connecting the coils, referenced 24*, of the electromagnetic system to an electrical energy accumulator 98 incorporated in the portable object according to the invention.
  • the set of coils generally of an even number and connected in parallel or in series, are connected to a rectifier 94 to which this set supplies an induced voltage U Ind .
  • the induced voltage signal is then supplied to a smoothing filter 95 and to a voltage booster 96 (which are optional) to generate a recharge voltage U Rec of the accumulator 98.
  • the accumulator supplies a supply voltage U Al to a load 100 incorporated in the portable object considered.
  • a switch Sw is provided to be able to activate or not the power supply to the load, depending on the demand and/or other electrical parameters, in particular the voltage level of the accumulator 98.
  • the watch movement 4 bears on its rear projecting part 4A, inserted in an opening of the PCB 22 carrying four coils 24, the resonant structure 48 whose part 48A is fixed to this rear projecting part.
  • the resonant structure further comprises an oscillating part 48B which is connected to the fixed part 48A by a system of flexible blades located in the same general plane and defining an axis of oscillation for this oscillating part and for the mass of inertia 16B which is fixed to the latter via a stud which is inserted into a corresponding hole arranged in a central element 18 of this mass of inertia.
  • the inertia mass 16B carries in its peripheral part four circular magnets 20 which are inserted into holes of four respective projecting parts between which are provided four free angular zones 78 opening laterally onto the space outside the inertia mass and s extending radially to a radius corresponding to that of a geometric circle in which the mass of inertia 16B is inscribed.
  • the rotor 64 is formed of three parts, a fixed central part 71, a half-disc 70 having a more massive peripheral part, and an annular structure 72 which is rigidly fixed to this peripheral part.
  • the half-disc 70 is mounted freely in rotation on the central part 71 by means of a ball bearing.
  • the central part 71 is fixed to the bottom 66 of the casing 32A by a screw 68.
  • Other fastening means can be envisaged, in particular welding or gluing.
  • the rotor 64 is mounted on the inside of the bottom 66 before assembly of this assembly with the middle part of the case.
  • the annular structure 72 carries four magnets 10B so as to allow them to undergo a radial elastic movement in order to be able to retract when these magnets arrive in angular zones respectively occupied by the magnets 20 of the mass of inertia, these occupied angular zones separating the free angular zones 78.
  • the magnets 10B are arranged so that, in a neutral position in which they are not subjected to any radial elastic force, they penetrate at least partially into the free angular zones 78.
  • the magnets 10B to have a radius of the central axis which is greater than the radius at this central axis of the magnets 20 of the mechanical resonator, in order to allow the operation provided for this third embodiment described below.
  • each flexible blade 74 has a longitudinal axis in the form of an arc of a circle centered on the axis of rotation of the rotor 64 which coincides with the axis of oscillation of the mass of inertia.
  • each flexible strip has great flexibility in the radial direction but relatively great rigidity in the angular/tangential direction.
  • the flexible blades advantageously have a height greater than their width, so as to have sufficient axial rigidity to remain in the general plane of the magnets 20 of the mechanical resonator also during the interactions between the magnets 10B and 20 which can generate a certain axial magnetic force. due to manufacturing tolerances.
  • Cavities 76 are provided in the annular structure to allow each first assembly, formed by a magnet 10B and the ring for fixing to the flexible blade 74, to undergo a radial movement over a sufficient distance to circumvent each second assembly, formed of a magnet 20 and the projecting part of the inertia mass serving to fix this magnet, when the rotor undergoes rotation.
  • each magnet of the inertia mass is arranged so as to protrude from this inertia mass, so that the inertia mass has first and second free angular zones, respectively on both sides of this magnet, in which each magnet of the rotor can move. Then, each magnet of the rotor is arranged so as to be able to undergo a radial elastic movement relative to the axis of oscillation of the mechanical resonator, under the action of a radial magnetic force which is generated by the interaction in magnetic repulsion with a magnet of the inertia mass, when this magnet of the rotor is located close to the magnet concerned of the inertia mass.
  • the position of minimum mechanical energy of each first magnet of the rotor corresponds to a radial position of this first magnet situated in a range of radial positions, relative to the axis of rotation of the rotor which coincides with the axis of oscillation of the inertia mass, corresponding to the free angular zones located between the second magnets of the inertia mass.
  • each first magnet of the rotor is fixed to the end of a corresponding elastic blade which is arranged so as to have a mainly tangential longitudinal axis and a capacity for elastic deformation essentially in a radial direction, relative to the axis of oscillation of the mechanical resonator.
  • the radial elastic movement of each of the first magnets of the rotor, under the action of the radial magnetic force, is provided with a sufficient amplitude to avoid a shock between the rotor and the inertial mass of the mechanical resonator during of the passage of a first magnet by the angular position of a second magnet.
  • the free angular zones 78 separating the angular zones occupied by the second magnets from the inertia mass, are provided so that the first magnets of the rotor do not abut against the inertia mass following a passage of these first magnets by the respective angular positions of the second magnets, so as not to disturb the oscillatory movement of the inertia mass at the resonance frequency F Res following this passage.
  • the magnets 10B of the rotor (one of which has an angular position a), carried by the respective flexible blades 74, have come sufficiently close to the magnets 20 of the mechanical resonator (variable angular distance ⁇ between the magnets of the rotor and the corresponding magnets of the mechanical resonator) so that the magnetic repulsion force F RM between them is significant and sufficient to drive the inertial mass 16B in rotation (represented here only by the four magnets 20).
  • the benefit of the particular arrangement of the rotor and of the mechanical resonator in the third embodiment of the invention is understood.
  • the force F RM is essentially tangential, which has the consequence that substantially the whole of this force F RM participates in the torque of magnetic force applied to the inertial mass.
  • the rotor drives the inertial mass with a force F RM whose intensity increases given the reduction in the distances between the first magnets 10B and the corresponding second magnets 20. Thanks to the presence of the free angular zones 78 described above and the neutral radial position provided for each magnet 10B of the rotor , while the intensity of the force F RM increases sharply, the force F RM remains substantially tangential in the relative position of the snapshot shown in Figure 8B . Thus, a magnetic torque of relatively high intensity is applied to the inertial mass of the mechanical resonator.
  • the radial component of the force has a value which becomes relatively large, this radial component acting on each magnet 10B so that each magnet 10B begins to undergo an elastic radial movement towards the outside thanks to to the flexible blade that carries it.
  • the magnets 10B deviate from their circular trajectory so as to retract when these magnets pass by the respective angular positions of the magnets 20 of the inertia mass, as shown in the snapshot of the Figure 8C .
  • the inertial mass reaches a position of equilibrium of the tangential forces (tangential magnetic force and elastic restoring force of the mechanical resonator) and is thus at an extreme angular position (with zero angular velocity) corresponding to the snapshot of the Figure 8C .
  • the mechanical resonator is excited/activated by the rotating rotor and it begins to oscillate substantially at its resonant frequency F Res from this extreme angular position which determines an initial amplitude for this oscillation.
  • the magnets 20 of the inertia mass rotate clockwise and again approach the magnets 10B of the rotor, as observed at the Figure 8F which shows the inertia mass again in an extreme angular position, although these magnets 10B of the rotor continue to rotate clockwise but at a speed less than the average speed of the magnets 20 of the inertia mass.
  • the magnetic repulsion force slows down the mechanical resonator and thus decreases its amplitude for this second alternation.
  • the magnetic force is a conservative force, most of the braking energy is given back to the mechanical resonator during the following alternation.
  • the Figure 8G substantially shows the instant of the end of this following alternation.
  • the mechanical resonator still oscillates freely for two to three periods of oscillation before finding itself again in a situation similar to that of the Figure 8B where a strong magnetic coupling intervenes again between the rotor and the mass of inertia of the mechanical resonator, so as to maintain the oscillating movement of the latter or generate a new oscillation of the mechanical resonator.
  • the Figure 8H still shows a snapshot at the end of the alternation following the snapshot of the Figure 8G , these two figures indicating the angular zone of free oscillation of the mechanical resonator.
  • the inertia mass when the magnets 20 of the inertia mass approach the magnet 10B of the rotor, the inertia mass generally undergoes magnetic braking which can momentarily stop the oscillation in progress, during the passage of the magnets of the rotor by the positions respective angular angles of the magnets of the mechanical resonator.
  • successive oscillations of the mechanical resonator are substantially generated by the rotating rotor via the magnetic force when it acts in the opposite direction to the direction of rotation of the rotor, i.e. after the magnets 10B of the rotor have passed, in s retracting, the magnets 20 of the mass of inertia, that is to say in time intervals according to the instantaneous state given to the Figure 8D .
  • each elastic structure formed by a magnet 10B and the flexible blade 74 which carries it, is selected so that it is sufficiently small so that the radial magnetic forces can move the magnets 10B out of the circular zone swept by the mass of inertia, in particular by the magnets 20 and their respective strappings during the passage of these magnets 10B by the angular positions of the magnets 20, it is provided that this radial elastic constant is however sufficiently large so that the radial oscillation frequency of each aforementioned elastic structure is higher than the resonance frequency F Res of the mechanical resonator.
  • the resonance frequency F Res is equal to 20 Hz
  • the radial oscillation frequency of each elastic structure of the rotor is at least equal to twice F Res , but preferably four to five times more large, in particular equal to approximately 100 Hz. This guarantees that the mechanical response of each elastic structure of the rotor is faster than the mechanical response of the mechanical resonator.
  • the magnets 10B of the rotor are moved sufficiently quickly during the passage of these magnets through the angular positions of the magnets 20 so as to avoid collisions which would disturb the operation of the system provided.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromechanical Clocks (AREA)
EP20187004.5A 2020-07-21 2020-07-21 Tragbares gerät, insbesondere armbanduhr, das mit einer stromquellevorrichtung mit einem elektromechanischen wandler ausgestattet ist Active EP3944027B1 (de)

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EP20187004.5A EP3944027B1 (de) 2020-07-21 2020-07-21 Tragbares gerät, insbesondere armbanduhr, das mit einer stromquellevorrichtung mit einem elektromechanischen wandler ausgestattet ist
JP2021102164A JP7181348B2 (ja) 2020-07-21 2021-06-21 電気機械変換器を設けられる電力供給デバイスを備えるウェアラブル物体、特に時計ブレスレット
CN202110834117.XA CN113960912B (zh) 2020-07-21 2021-07-20 可穿戴物体

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WO1992004662A1 (en) 1990-09-07 1992-03-19 Kinetron B.V. Generator
EP0822470A1 (de) 1996-08-01 1998-02-04 Asulab S.A. Elektronisches Uhrwerk, das einen Generator enthält, der von einer Zugfeder getrieben wird
EP1085383A1 (de) 1999-09-17 2001-03-21 Eta SA Fabriques d'Ebauches Stossfeste Vorrichtung für einen durch eine Schwungmasse angetriebenen Generator
EP1174776A1 (de) * 2000-02-29 2002-01-23 Seiko Instruments Inc. Mechanische uhr mit einem haltungsdetektionselement und einem optischen element zur detektion der drehung der regulierten ringunruh
EP1178372A1 (de) * 2000-02-29 2002-02-06 Seiko Instruments Inc. Haltungsdetektionselement und mechanische uhr mit einem detektionselement vom elektrostatischen kapazitätstyp
EP1239349A1 (de) 2001-03-09 2002-09-11 Kinetron B.V. In Miniatur-Geräten verwendbare Stromversorgungsvorrichtung zur Umformung von kinetischer Energie in elektrische Energie
US20050036405A1 (en) * 2003-01-10 2005-02-17 Asulab S.A. Timepiece having a mechanical movement associated with an electronic regulator
EP1521142A1 (de) * 2003-10-01 2005-04-06 Asulab S.A. Uhr mit einem mechanischen Uhrwerk, das mit einem elektronischen Regulator gekoppelt ist
EP3206089A1 (de) 2016-02-10 2017-08-16 The Swatch Group Research and Development Ltd. Resonatormechanismus eines uhrwerks

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FR1583646A (de) * 1968-01-17 1969-11-21
CH1708570A4 (fr) * 1969-12-29 1975-10-15 Mcshan Clarence Hunter Dispositif électromagnétique, notamment moteur synchrone, pour appareil horométrique
JPS4725077U (de) * 1971-04-12 1972-11-21
CH689469A5 (fr) * 1996-12-18 1999-04-30 Patek Philippe Sa Convertisseur d'énergie mécano-électrique et pièce d'horlogerie comportant un tel convertisseur d'énergie.
JP2002345208A (ja) 1999-03-08 2002-11-29 Seiko Epson Corp 発電機の起動装置および計時装置
JP2013005708A (ja) * 2011-06-12 2013-01-07 Hokkaido Tokushu Shiryo Kk 発電装置
EP3130966B1 (de) * 2015-08-11 2018-08-01 ETA SA Manufacture Horlogère Suisse Mechanisches uhrwerk, das mit einem bewegungsrückkopplungssysteme ausgestattet ist
EP3502796B1 (de) * 2017-12-20 2020-05-20 The Swatch Group Research and Development Ltd Uhrwerksanordnung, die einen mechanischen oszillator umfasst, der mit einer einstellvorrichtung verbunden ist
EP3629104B1 (de) * 2018-09-27 2021-05-12 The Swatch Group Research and Development Ltd Mechanische uhr umfassend eine elektronische vorrichtung zur regulierung der ganggenauigkeit der uhr

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Publication number Priority date Publication date Assignee Title
WO1992004662A1 (en) 1990-09-07 1992-03-19 Kinetron B.V. Generator
EP0822470A1 (de) 1996-08-01 1998-02-04 Asulab S.A. Elektronisches Uhrwerk, das einen Generator enthält, der von einer Zugfeder getrieben wird
EP1085383A1 (de) 1999-09-17 2001-03-21 Eta SA Fabriques d'Ebauches Stossfeste Vorrichtung für einen durch eine Schwungmasse angetriebenen Generator
EP1174776A1 (de) * 2000-02-29 2002-01-23 Seiko Instruments Inc. Mechanische uhr mit einem haltungsdetektionselement und einem optischen element zur detektion der drehung der regulierten ringunruh
EP1178372A1 (de) * 2000-02-29 2002-02-06 Seiko Instruments Inc. Haltungsdetektionselement und mechanische uhr mit einem detektionselement vom elektrostatischen kapazitätstyp
EP1239349A1 (de) 2001-03-09 2002-09-11 Kinetron B.V. In Miniatur-Geräten verwendbare Stromversorgungsvorrichtung zur Umformung von kinetischer Energie in elektrische Energie
US20050036405A1 (en) * 2003-01-10 2005-02-17 Asulab S.A. Timepiece having a mechanical movement associated with an electronic regulator
EP1521142A1 (de) * 2003-10-01 2005-04-06 Asulab S.A. Uhr mit einem mechanischen Uhrwerk, das mit einem elektronischen Regulator gekoppelt ist
EP3206089A1 (de) 2016-02-10 2017-08-16 The Swatch Group Research and Development Ltd. Resonatormechanismus eines uhrwerks

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EP3944027B1 (de) 2024-06-05
CN113960912A (zh) 2022-01-21
JP2022021304A (ja) 2022-02-02
CN113960912B (zh) 2023-03-28
JP7181348B2 (ja) 2022-11-30

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