• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The rotary actuator with moving frame consists of an electric coil (1) moving on an angular stroke about an axis of rotation A, the coil (1) being cylindrical elliptical and the winding axis B being orthogonal to the axis of rotation A, the coil (1) being placed in the magnetic field of a fixed magnet. The fixed magnet surrounds said coil (1) and consists of two semicylindrical parts (3, 4) whose generatrices are orthogonal to the axis of rotation A, the first of the semi-cylindrical parts having a North pole directed towards the coil (1), orthogonal to the direction of the generatrices and being positioned outside the coil (1), the second having a south pole directed towards the coil, orthogonal to the direction of the generators and also being positioned outside the coil the coil (1) opposite the first part. The actuator comprises a ferromagnetic core (6) inside the coil (2) and an external ferromagnetic yoke (5) surrounding the fixed magnet, the coil (1) moving in the air gap generated between the magnetized semi-cylindrical parts (3, 4) and the inner core (6).
    公开号:FR3045239A1
    申请号:FR1562353
    申请日:2015-12-15
    公开日:2017-06-16
    发明作者:Guillaume Loussert；Stephane Biwersi
    申请人:Moving Magnet Technologie SA；
    IPC主号:
    专利说明:

    IMPROVED MOBILE FRAME ACTUATOR AND ENHANCED DYNAMIC TECHNICAL FIELD OF THE INVENTION
    The present invention relates to a wound mobile frame actuator which has mechanical and electrical properties giving it great ability to change its speed of movement. This very high dynamic, characterized by significant acceleration and deceleration capabilities, makes it possible to control with high precision a mobile member oscillating over a determined angular stroke with a velocity profile exhibiting highly variable accelerations on the stroke. In particular, such an actuator can be used for the realization of an adaptive lighting system allowing a parameterizable lighting mode, with intensity variations on the illuminated area.
    One of the preferred applications, but not limited to, relates to lighting for a motor vehicle having a laser source that produces a beam reflecting on a mirror and for illuminating the roadway. The dynamic qualities of an actuator according to the invention will make it very flexible lighting, avoiding for example certain areas of the road or even allowing a more intense illumination on other areas, or on the contrary mitigate the light intensity, for example to avoid dazzling a driver coming in the opposite direction.
    STATE OF THE PRIOR ART
    The type of actuators called "galvanometers", with reference to their original use in current detection devices, are already well known and they take different forms. They can be mobile iron core, moving magnet or voice coil. They are advantageously used in applications of dynamic oscillators typically operating at several tens or hundreds of Hertz.
    These galvanometers are thus integral with an outer member to move on a stroke, linear or most often angular, generally from several degrees to several tens of degrees. A typical example is the displacement of a mirror when considering the application of light beam deflection. The movement is then periodic according to a main frequency and the mobile part oscillates within a given race.
    When these galvanometers are movable iron core, they have the advantage of a facilitated heat dissipation, the electrical coil being disposed at the stator and can be generously sized, allowing them to move high loads without critical heating. However, they have high inertia and inductance prohibiting their use for high frequencies, typically remaining under 50 Hz of operation.
    When they have a moving magnet, they always have relatively large moving inertia and, although having lower inductances than the movable iron actuators, their use can not be envisaged for movements at typically higher frequencies. at 100Hz. In the example presented in US6275319, which provides a galvanometer for laser scanner, the operating frequency is of the order of one hundred Hertz. The actuator further comprises an elastic return member having a non-linear response. This non-linearity allows the actuator to benefit from assistance with acceleration and deceleration and to limit the parasitic resonances of the structure, parasitic resonances caused, inter alia, by the excessive inertia of the magnet. mobile.
    When they are moving coil, they are always made of a coil of electrical conductor (copper type, aluminum or silver) in the form of one or more turns wound on a mechanical support or self-supporting if the coil thus constituted is resinated for example. Their advantage lies in the low inertia and inductance that can be achieved with these topologies. The disadvantage may be the low heat dissipation imposed by the small volumes of electrical conductors formed and the fact that these coils are, in most cases, mainly in contact with the air in which they move, without contact with a thermal conductor .
    The low inertia and inductance of mobile frame solutions allow them to be used in applications where the operating frequency is higher (typically several tens to hundreds of Hertz).
    The operation of the actuators of the prior art generally being at fixed operating frequency, it is known and advantageous to use these actuators in conjunction with an elastic return element having a mechanical stiffness which sets a certain mechanical resonance frequency depending on this stiffness and the mass or inertia in motion.
    There are thus documents which have such devices, such as for example the document US3735258, having a deflector for light beam using a mobile frame galvanometric type. The proposed solution operates using a torsion spring and seeks to optimize a single frequency of operation by equalizing the mechanical and electromechanical resonance frequencies involving the inertia, the inductance and the mechanical stiffness of the spring.
    The disadvantage of this structure is the choice of using a relatively long mobile frame and rectangular shape, for use both as a motor frame, immersed in the magnetic field provided by fixed magnets, and at the mechanical strength of the reflector used to deflect a light beam. This solution implies relatively high inertia and electrical resistance but also a significant inductance. It also requires the realization of a coil of aluminum tape to obtain improved stiffness. This results in a low-performance actuator, subject to parasitic resonances frequencies, presumably expensive to produce (from the aluminum tapes, unconventional used) and difficult to build and tuned frequency. In addition, the electrical breaking frequency of the system RL thus formed (combination of a resistor R in series with an inductance L) can be evaluated at 2.2 Hz, a very low value which makes the system is not intended to be used effectively only around the electromechanical resonance frequency (resonance between inductance and inertia).
    Also known in the general field of oscillating actuators EP2686554 document for optimizing the dynamic operation of a compressor. In this document, it is cleverly proposed to use the two frequencies of mechanical and electromechanical resonance of the system to overcome a problem of electrical point load of the system. In this respect, the two frequencies are close enough to respect the efficiency of the compressor.
    This device is perfectly dedicated to the use of a vibrating actuator in the context of use at a frequency set by the mechanical resonance (or which deviates from 1 or 2 Hertz of this fixed frequency) away from this reduced range and under the use of a purely sinusoidal power supply. The solution is therefore not dedicated to the use of a system to work at various frequencies and / or with significant harmonic content.
    DISADVANTAGES OF THE PRIOR ART
    The devices of the prior art are intended to solve the general problem of the efficiency of frequency operations. In these systems, the scanning speed is primarily performed at a fixed frequency and especially according to a displacement, within this frequency, which has a single repeated profile. The operating frequency is therefore primarily adjusted by the resonance frequencies of the system.
    These devices of the prior art are used to work around this fixed frequency with a low harmonic content.
    However, in systems where the scanning speeds must be variable, as shown for example in the document EP2690352, these actuators of the prior art can not provide a satisfactory answer because they do not have, by their resonant nature. , the ability to change their operating frequency without greatly impacting the efficiency of the actuator.
    In addition, if we take for example the highly dynamic scanning application of laser-type automotive lights (typical frequency of 200Hz), there is a need, within the imposed movement at a frequency of fixed scan, to obtain a great variability of the acceleration with the possibility of slowing down or accelerating the beam in different places on the angular travel of the actuator.
    The devices of the prior art thus have speed characteristics strongly influenced by the mechanical stiffness printed by the torsion springs, with parabolic profiles as a function of time, making it difficult to modify this speed profile. inside the main frequency of use.
    SUMMARY OF THE INVENTION
    The present invention aims to overcome the disadvantages of the state of the art by providing an actuator having optimized geometric and physical properties minimizing the importance of the mechanical resonance frequency, the mechanical resonance frequency frm being defined by the value
    where K is the mechanical stiffness (in Nm / rad) and J the mobile moment of inertia (in kg.m2), by obtaining an electrical breaking frequency and an electromechanical resonance frequency much greater than the periodic signal at main frequency supplying the actuator, where the cutoff frequency fce of the electrical system is defined by
    with R the electrical resistance (in Ohm) and L the inductance (in H) and the electromechanical frequency / em of the actuator is defined by
    where Kt is the torque constant of the actuator (in Nm / A).
    By these characteristics, another object of the invention is to allow the power supply of the actuator with a periodic signal at main frequency whose harmonic content is rich (with typically a harmonic of rank 5 having a higher amplitude at 10% of the amplitude of the modulating signal).
    In order to allow these functionalities, the present invention thus proposes a movable frame actuator with an elliptical shape, preferably circular, which makes it possible to obtain a very low inertia, generally adjusted to a value of the order of that of the inertia. the outer member to be moved, and optimized stress, inductance and resistance characteristics to repel fce and fem far beyond the frequency of the main frequency periodic signal.
    More particularly, in order to meet these objectives, the invention refers to a rotary actuator with a movable frame consisting of an electric coil moving on an angular stroke about an axis of rotation A, the coil being of cylindrical elliptical shape and the winding axis B being orthogonal to the axis of rotation A, the coil being placed in the magnetic field of a fixed magnet, characterized in that the fixed magnet surrounds said coil and consists of two semi-cylindrical parts whose generatrices are orthogonal to the axis of rotation A, the first of the semi-cylindrical parts having a North pole directed towards the coil, orthogonal to the direction of the generatrices and being positioned outside the coil, the second having a south pole directed towards the coil, orthogonal to the direction of the generatrices and being also positioned outside the coil opposite the first Part I, the actuator having an inner ferromagnetic core to the coil and an outer ferromagnetic yoke surrounding the fixed magnet, the coil moving in the air gap generated between the magnetized semi-cylindrical portions and the inner core (6).
    Preferably, the coil is secured to a mechanical shaft guided by means of the outer yoke.
    One of the objects of the invention is to allow operation even without any elastic return element.
    In order to allow operation in a closed loop, the system may further comprise an electronic control circuit supplying the coil with a signal with a main frequency of use greater than 100 Hz.
    In the context of a light deflection application, the mechanical shaft supports an element having a reflective surface placed in the direct vicinity of the axis of rotation.
    In the case of use where large speed variations are desired, the electronic control circuit supplies the coil with a periodic signal with a main frequency having a harmonic content having at least one harmonic of rank greater than 5 having an amplitude. greater than 10% of the amplitude of the main frequency.
    To perform a closed-loop control, the actuator further comprises an angular position sensor of said coil, delivering a signal to said electronic control circuit for controlling the supply voltage of said coil according to a profile. reference speed versus position.
    Preferably, said coil has a circular elliptical longitudinal section but it can also be considered non-circular elliptical shape.
    In the preferred embodiment, said mechanical shaft passes through said ferromagnetic core, without contact or guidance with said core although it can be envisaged that said mechanical shaft is guided at said ferromagnetic core without contact or guide with ferromagnetic cylinder head.
    In a particular mode of implementation said mechanical shaft has a sensor magnet positioned in the vicinity of a magnetosensitive probe and cooperating with said sensor detecting the position of the sensor magnet.
    When using a sensor magnet, the actuator is driven by a periodic signal at main frequency and has, in magnetic interaction with the sensor magnet, a mechanical resonance frequency lower than or equal to said main frequency .
    In order to minimize the inductance of the coil, the core and the outer yoke can be made by stacking ferromagnetic sheets.
    The invention also relates to a control method of an actuator for an adaptive lighting system comprising an actuator as defined, characterized in that the value of the supply voltage of the coil is periodically modified as a function of a position signal from an angular position sensor of said coil and a speed profile as a function of the position.
    BRIEF DESCRIPTION OF THE FIGURES
    Other features and advantages of the invention will become apparent from the following reading of detailed embodiments, with reference to the accompanying figures which respectively show: - Figures 1a and 1b, respectively front and perspective views respectively an actuator according to the invention; - Figure 2, a front view of the actuator in a first embodiment of the magnetization; - Figure 3, a front view of the actuator in a second embodiment of the magnetization; FIGS. 4a and 4b, views respectively in perspective cut along the plane P and in enlargement of said perspective of an actuator according to the invention; FIG. 5, a perspective view of an actuator and position sensor assembly used to move and detect the position of a mirror; FIGS. 6a and 6b, cross-sectional views to the axis of rotation (A); ) with the coil in two extreme stroke positions, - Figure 7, a cross-sectional view to the axis of rotation (A) where the ferromagnetic fixed elements are made in sheet metal package, - Figure 8, a view in longitudinal section, along the axis of rotation (A), of the actuator in a first electric supply mode of the coil, - Figure 9, a longitudinal sectional view along the axis of rotation (A), of the actuator in a second power supply mode of the coil, - Figure 10, a front view of an actuator according to the invention superimposed with field lines according to the first embodiment of the magnetization - Figure 11, a front view of an actuator according to the inve in superposition with field lines according to the second embodiment of the magnetization; - FIG. 12, the evolution, by way of example, of the speed and the possible position with an actuator according to the invention, as well as a harmonic decomposition of the speed; FIG. 13, a front view of an actuator according to an alternative embodiment with a coil of longitudinal section with a non-circular elliptical shape.
    DETAILED DESCRIPTION OF AN EMBODIMENT
    Figures 1a and 1b show an actuator according to the invention. It comprises an electric coil (1) movable in rotation about an axis (A) and consisting of a set of electric conductive turns. The coil (1) is of cylindrical elliptical shape, here in a circular preferred form, and the winding axis B of the turns is orthogonal to the axis of rotation (A). Due to the rotation of the coil about the axis (A), the winding axis (B) has an orientation moving in space but still remaining orthogonal to the axis of rotation (A).
    The coil (1) is fixed to a mechanical shaft (2) which serves as a support for the coil and which also serves to move integrally an outer member (not shown here). The coil (1) is rotatable relative to a fixed part formed by two semi-cylindrical permanent magnets (3, 4) whose generatrices, not shown, are orthogonal to the axis of rotation A. These permanent magnets (3, 4) have a magnetization whose direction or directions are orthogonal to the generatrices of the tubular magnets so that the magnetic field produced by the magnets (3, 4) is mainly oriented in a set of planes parallel to the plane defined by the axis of rotation A and an axis perpendicular to the semi-cylindrical magnetized portions, as illustrated in FIGS. 10 and 11.
    The magnetization of the magnets (3, 4) is such that one of the magnets (3) must have a north pole facing the air gap and the coil (1), and the other magnet (4) must have a North pole oriented opposite the gap and the coil (1), not important on the positioning of the magnets (3, 4) to the left or right of the coil (1). As shown in FIG. 2, the magnetization of the magnetized parts (3, 4), represented by wide arrows recessed on the magnets, may be radial relative to the circular cylindrical shape of the magnetized parts (3, 4) or, as shown in FIG. FIG. 3, diametrical with respect to the circular cylindrical shape of the magnetized parts (3, 4). Advantageously, the radial magnetization shown in FIG. 2 makes it possible to obtain better performances of the actuator by allowing a torque constant of the optimized actuator and a more radial direction of the field in the gap, as can be appreciated on FIGS. 10 and 11 are views of field lines of the cases respectively presented in FIGS. 2 and 3.
    The holes (14) which can be seen in Figure 2 in particular, are used for indexing and fixing elements and are quite optional, having no influence on the performance of the actuator and on the object of the invention.
    These magnets (3, 4) are placed on either side, externally, of the coil (1). These magnets (3, 4) are integral with an outer yoke (5) of soft ferromagnetic material surrounding the magnets (3, 4) to allow the magnetic flux to flow between the magnets (3, 4) and to maximize the magnetism. induction in the gap. On the inside of the cylindrical coil (1) there is an inner core (6), fixed with respect to the coil (1), also made of soft ferromagnetic material in order to channel the magnetic field produced by the magnets (3, 4 ). The coil (1) is thus positioned in an air gap formed between the magnet (3) and the inner core (6) on the one hand for part of the coil (1) and in a gap formed between the magnet (4). ) and the inner core (6) on the other hand for another part of the coil (1). All elements in the fixed part: magnets (3, 4), inner core (6) and outer yoke (5) are, in this example, circular which optimizes the shape and volume of the elements. It is of course possible to envisage an outer non-circular cylinder head, parallelepiped for example, without changing the operation or the performance of the actuator. The generally circular shape of the coil is, however, an optimized shape for maximizing the performance of the actuator. A general elliptical shape can be envisaged for the coil (1) to adapt the structure to a particular use, as shown by way of example in FIG. 13.
    The operation of the actuator, following the well-known Laplace law, is as follows: when a current flows in the coil (1), the driver, immersed in the magnetic field of the two airspaces defined above, undergoes a force that tends to create a torque around the axis of rotation (A). By alternating the flow direction of the current in the coil (1), it is therefore possible to apply a positive or negative torque and to perform an oscillation of the coil (1) around the axis of rotation (A). The winding axis (B) is accordingly oriented relative to the axis of rotation (A). The coil (1) is fully immersed in the defined gaps, so that when the oscillation of the coil is of the order of a few degrees (typically up to twenty or thirty degrees), the torque constant which is obtained is almost constant on the race, promoting easy control of the actuator by controlling the current intensity flowing.
    There exists, in the actuator, no mechanical or magnetic spring, so that the coil (1) is completely free and moved by the magnetic torque created by the flow of current. It may therefore be important to achieve mechanical stops to prevent the coil (1) comes into contact with the inner core (6) during its rotation.
    The fact that there is no mechanical or magnetic spring in the actuator, makes controlling the positioning of the coil (1) easier. Likewise, the very flexible movement dynamics is favored by the elliptical cylindrical shapes, and particularly here circular shapes, of the coil (1) are magnets (3, 4) which make it possible to minimize the inductance and the inertia of the coil (1) while maintaining a significant torque constant. These factors inductance and inertia, as well as the torque constant, are thus greatly improved with respect to the topologies of the prior art. The electromechanical resonance frequency of the actuator is thus relatively high and pushed back well beyond the main operating frequency (typical orders of magnitude: 200 Hz for the main operating frequency and 1 kHz at 1.5 kHz for the electromechanical frequency) . This marked difference makes it possible to envisage a control signal rich in harmonic (typically a harmonic of amplitude typically greater than 10% of the amplitude of the main frequency) making it possible to generate very different speed profiles according to the specifications. requested. The electrical cut-off frequency of the system is also, because of the ratio between the resistance and the inductance, pushed back well beyond the main operating frequency (typical order of magnitude greater than 10 kHz).
    The typical performance that can be achieved with an actuator made according to the invention are illustrated in Figure 12 by way of example. As can be appreciated, very different speed and position profiles as a function of time are possible with such an actuator. These very different profiles are particularly appreciated in view of the harmonic decomposition that is performed. We can notably notice that the harmonic content is relatively important compared to the amplitude of the main frequency signal (here the harmonic of rank 1 is at 200Hz) with harmonics of important amplitudes (> 10%) up to the rank 6 typically, although this content is in no way limiting.
    Figure 4a shows a perspective view and in section along the median plane P visible in Figure 1b. In particular, it makes it possible to see the guide elements (12), such as bearings, which serve to guide the mechanical shaft (2) in rotation. Advantageously, but not exclusively, the mechanical shaft (2) is made of a rigid material (metal, carbon fiber, etc.) which makes it possible to keep a relatively small diameter, in order to minimize the inertia in motion, while keeping a satisfactory rigidity preventing the actuator from deforming orthogonally to the axis of rotation (A), during rotation, and thus limiting parasitic frequencies during operation. The mechanical shaft (2) will, however, preferentially be made of a non-magnetic material. The guide elements (12) are advantageously made of a material limiting the coefficient of friction with the axis of rotation, such as a PTFE material or a thermoplastic polymer material with a low coefficient of friction. In order not to create a detrimental hyper-droop, there is preferably no guiding of the mechanical shaft (2) at the core (6), the diameter of the shaft (2) being smaller than the passage diameter at the level of the nucleus (6).
    The enlargement in Figure 4b allows to appreciate the attachment of the coil (1) on the mechanical shaft (2). A mechanically interesting possibility is indeed to make flats (7) on the shaft (2) to achieve a flat reception area for fixing the coil (1). The coil will preferably be positioned closer to the axis of rotation (A) in order to maintain a mobile center of inertia close to this axis (A) and thus limit the sensitivity to external vibrations transmitted to the actuator. This positioning will also be preferable to guarantee an optimal torque constant for the actuator.
    The coil is advantageously wound and embedded in a thermosetting type resin (epoxy for example), providing rigidity to the coil while ensuring lightness and thus minimizing the moment of inertia.
    The coil thus resinated and stiffened can then be placed (glued for example) on the mechanical shaft (2) at the flats (7). In this sense a metal tree is preferable.
    One of the advantages of the mechanical connection between the coil (1) and the mechanical shaft (2) is also in the heat dissipation allowed by the contacts between coil (1) and shaft (2) at the flats (7). ). Indeed, this contact, even limited, allows to evacuate the heat produced by Joule effect by the coil (1) in the shaft (2) and thus allows to benefit from an improved thermal resistance (lower) if the the thermal resistance of this same coil (1) is compared in the air without physical contact with the shaft (2).
    A preferred application of an actuator according to the invention is the deflection of a light beam, of the laser type, for example, by the displacement of a mirror reflecting said light beam. To do this, it can be connected solidarily to the mechanical shaft (2) and on one of its axial ends, a mirror (11), the precise control of the movement of the coil allowing the precise displacement of the mirror (11). On the other end of the mechanical shaft (2), it may be envisaged to place a position sensor to know the position of the mechanical shaft (2) and therefore the coil (1). Knowledge of the position of the shaft will adjust the current in the coil to meet a set position or speed through the use of a closed-loop control electronics.
    In the example of FIG. 5, the position sensor is a magnetic sensor constituted by a sensor magnet (10) whose magnetization is directed along the recessed wide arrow, ie orthogonally to the axis of rotation (A). This sensor magnet (10) cooperates with a magnetosensitive probe (9), placed on a printed circuit (8), which detects the variation of the direction of the magnetic field. A commercial example of such a sensor is a Triaxis® type sensor from Melexis. The advantage of such a sensor is its accuracy and ease of assembly and the channeling of the magnetic flux generated by the magnets (3, 4) of the actuator by the outer yoke (5) cancels any disturbance on the magnetosensitive probe ( 9).
    The use of a sensor magnet (10) can nevertheless add a magnetic torque on the actuator, by magnetic interaction between the sensor magnet and the actuator, which therefore introduces a mechanical resonance frequency. It will thus be necessary to size the distance between the sensor magnet (10) and the outer yoke (5) so that the resonance frequency is typically less than or equal to the main supply frequency of the coil (1). We can also opt for a bipolar magnetization of the magnet 10 along the axis A which will minimize the magnetic coupling between sensor and actuator.
    In Figures 6a and 6b, in a cross section to the axis of rotation (A), are shown the extreme positions that can take the coil (1) during operation. These positions may be further apart but depend on the desired course. In the case of example, the angular difference is of the order of 20 °, that is +/- 10 ° around the position where the coil (1) is centered in the race. It should be noted that the plane P longitudinal section of the actuator may be a structural section of the actuator to have an outer cylinder head (5) in two parts and facilitate the construction of the actuator.
    The fact of not having an elastic return element, or an elastic element external to the actuator which adds a low stiffness, allows to consider an oscillating operation of the actuator not only around the centered position but also with a shift. It can for example oscillate around one of the two positions that can be seen in FIGS. 6a or 6b or any oscillation inside the extreme positions.
    In these sectional views in FIGS. 6a and 6b, it is furthermore seen that the transverse height of the core (6) and of the outer yoke (5) will advantageously be greater than the transverse height of the magnets (3, 4) in order to to reduce the magnetic induction in the ferromagnetic parts and thus to optimize the performances while avoiding the magnetic saturation.
    Due to a relatively low coil inductance and the lack of movement of the magnets relative to the ferromagnetic yokes (5, 13) and core (6), losses by magnetic hysteresis or induced currents, generally called losses. iron, are negligible. However, by the purely cylindrical nature of the magnetic structures, and by the circulation of the magnetic flux, it is possible to envisage the realization of the core (6) and the cylinder head (5) in the form of sheets, for example sheet metal iron-silicon. This allows a possible realization benefit and structure cost. This also makes it possible to reduce the inductance of the coil (1), the magnetic flux produced by the coil then traversing the various plates, in a non-privileged direction for the plates (through the plates), the flux of the coil (1 ) is decreased without penalizing the flow produced by the magnets (3, 4) which flows in the generally orthogonal direction (following the orientation of the coil (1) to that of the coil (1), the flow of the flow of the coil can be appreciated with the schematic dotted paths visible in Figure 7.
    One of the important challenges for the actuator is a coil connector (1) efficient and durable. Indeed, the coil being mobile, its power is in a preferred way through mobile son. In Figure 8, we give an example of electrical connection of these movable son (16) to a printed circuit (14). In a preferred manner, these movable wires (16) will be connected to a printed circuit (14) closest to the axis of rotation (A) to limit their angular excursion and their displacement and they will be able to leave in front (as illustrated in FIG. ) or behind the actuator (not shown). The moving wires (16) are then soldered to the printed circuit (14) and the power supply can be deported via conductive copper tracks (15) belonging to the printed circuit (14).
    Another interesting alternative for the power supply of the coil (1) is to provide a non-contact power supply by a primary coil (17) fixed to the printed circuit (14) as seen in FIG. 9. The coil ( 1) of the actuator can thus be short-circuited to prevent any movement of the output wires. The supply of the coil (1) actuator is thus performed by supplying the primary coil (17) and by application of the Lenz law, in the manner of a transformer. This solution implies a higher electrical energy consumption, because of the Joule losses in the two coils (1, 17) and the imperfect coupling between the two coils (1, 17) but will eventually ensure a higher durability of the connector of the actuator.
    权利要求:
    Claims (15)
    [1" id="c-fr-0001]
    1. Rotary actuator with movable frame consisting of an electric coil (1) moving on an angular stroke about an axis of rotation A, the coil (1) being cylindrical elliptical ^ and the winding axis B being orthogonal to the axis of rotation A, the coil (1) being placed in the magnetic field of a fixed magnet, characterized in that the fixed magnet surrounds said coil (1) and consists of two semi-cylindrical parts ( 3, 4) whose generatrices are orthogonal to the axis of rotation A, the first of the semi-cylindrical parts having a North pole directed towards the coil (1), orthogonal to the direction of the generatrices and being positioned outside the the coil (1), the second having a south pole directed towards the coil, orthogonal to the direction of the generatrices and being also positioned outside the coil (1) opposite the first part, the actuator comprising a noya a ferromagnetic (6) inside the coil (1) and an outer ferromagnetic yoke (5) surrounding the fixed magnet, the coil (1) moving in the air gap generated between the magnetized semi-cylindrical parts (3, 4) and the inner core (6).
    [2" id="c-fr-0002]
    2. actuator with movable frame according to claim 1 characterized in that the coil (1) is integral with a mechanical shaft (2) guided by means of the outer yoke (5).
    [3" id="c-fr-0003]
    3. actuator with movable frame according to claim 1 characterized in that it comprises no elastic return element.
    [4" id="c-fr-0004]
    4. A movable frame actuator according to claim 1 characterized in that the system further comprising an electronic control circuit supplying the coil (1) with a signal with a main frequency of use greater than 100 Hz.
    [5" id="c-fr-0005]
    5. A movable frame actuator according to claim 2 characterized in that the mechanical shaft (2) supports an element having a reflective surface placed in the direct vicinity of the axis of rotation.
    [6" id="c-fr-0006]
    6. movable frame actuator according to claim 4 characterized in that said electronic control circuit feeds the coil (1) with a periodic signal at main frequency having a harmonic content having at least one harmonic of greater than 5 having a greater amplitude at 10% of the amplitude of the main frequency.
    [7" id="c-fr-0007]
    7. actuator with moving frame according to claim 4 characterized in that it further comprises an angular position sensor of said coil (1), delivering a signal to said electronic control circuit for controlling the supply voltage of said coil ( 1) according to a reference profile of speed versus position.
    [8" id="c-fr-0008]
    8. actuator with moving frame according to claim 1 characterized in that said coil (1) has a longitudinal elliptical non-circular section.
    [9" id="c-fr-0009]
    9. actuator with moving frame according to claim 1 characterized in that said coil (1) has a circular longitudinal section.
    [10" id="c-fr-0010]
    10. A movable frame actuator according to claim 2 characterized in that said mechanical shaft (2) passes through said ferromagnetic core (6) without contact or guidance with said core (6).
    [11" id="c-fr-0011]
    11. A movable frame actuator according to claim 2 characterized in that said mechanical shaft (2) is guided at said ferromagnetic core (6) without contact or guide with ferromagnetic yoke (5).
    [12" id="c-fr-0012]
    12. actuator with movable frame according to claim 2 characterized in that said mechanical shaft (2) has a sensor magnet (10) positioned in the vicinity of a magnetosensitive probe (9) and cooperating with said probe (9) detecting the position of the sensor magnet (10).
    [13" id="c-fr-0013]
    13. A movable frame actuator according to claim 12 characterized in that the actuator is driven by a periodic signal at main frequency and that it has, in magnetic interaction with the sensor magnet (10), a mechanical resonance frequency less than or equal to said main frequency.
    [14" id="c-fr-0014]
    14. A movable frame actuator according to claim 1 characterized in that the core (6) and the outer yoke (5) are made by stacking ferromagnetic sheets.
    [15" id="c-fr-0015]
    15. A control method of an actuator for an adaptive lighting system comprising an actuator as defined in claim 1 characterized in that the value of the supply voltage of the coil (1) is periodically modified as a function of a position signal from an angular position sensor of said coil (1) and a speed profile as a function of the position.
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    同族专利:
    公开号 | 公开日
    WO2017103424A1|2017-06-22|
    US20180375416A1|2018-12-27|
    JP6935401B2|2021-09-15|
    FR3045239B1|2018-01-19|
    EP3391517B1|2020-06-10|
    JP2019500837A|2019-01-10|
    EP3391517A1|2018-10-24|
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    法律状态:
    2017-04-24| PLFP| Fee payment|Year of fee payment: 2 |
    2017-06-16| PLSC| Publication of the preliminary search report|Effective date: 20170616 |
    2017-11-21| PLFP| Fee payment|Year of fee payment: 3 |
    2019-11-20| PLFP| Fee payment|Year of fee payment: 5 |
    2020-11-20| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1562353A|FR3045239B1|2015-12-15|2015-12-15|IMPROVED MOBILE FRAME ACTUATOR AND IMPROVED DYNAMIC|
    FR1562353|2015-12-15|FR1562353A| FR3045239B1|2015-12-15|2015-12-15|IMPROVED MOBILE FRAME ACTUATOR AND IMPROVED DYNAMIC|
    JP2018531140A| JP6935401B2|2015-12-15|2016-12-13|Actuator with high dynamic characteristics with movable coil frame|
    PCT/FR2016/053363| WO2017103424A1|2015-12-15|2016-12-13|Actuator with moving coil frame and enhanced dynamics|
    EP16826090.9A| EP3391517B1|2015-12-15|2016-12-13|Actuator with moving coil frame and enhanced dynamics|
    US16/061,958| US20180375416A1|2015-12-15|2016-12-13|Actuator with moving coil frame and enhanced dynamics|
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