• 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 invention relates to a rotation sensor comprising: - a stator (A) and a rotor (B) coaxial and forming a magnetic circuit (10, 20), the rotor being mounted at an angular displacement relative to the stator, a primary winding, adapted to generate a magnetic field in the magnetic circuit, and at least one secondary winding, characterized in that the magnetic circuit comprises at least one tooth (220) extending radially with respect to the axis (XX) of the stator and the rotor, and at least one notch (12) adapted to receive said tooth so that the tooth is separated from the notch by at least one tangential gap (51), variable as a function of the angular displacement of the rotor relative to the stator, the tooth and the notch being shaped so that a variation in width of a tangential gap causes a variation of the potential difference across the secondary winding.
    公开号:FR3025882A1
    申请号:FR1458647
    申请日:2014-09-15
    公开日:2016-03-18
    发明作者:Bastien Cagnac；Jerome Piaton；Kevin Brenugat
    申请人:Sagem Defense Securite SA；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The field of the invention is that of rotation sensors, in particular sensors of the inductive type, known by the acronym RVDT for Rotary Variable Differential Transformer.
    [0002] The invention is particularly applicable to the measurement of low relative rotation angles between two shafts. The invention finds an advantageous application in the measurement of torsion torque applied to a shaft.
    [0003] STATE OF THE ART It is known to measure a torque at the output of an actuator by a torsion measurement of the output shaft. Several means of measurement have been proposed. For example, it is known to position, on the output shaft of the actuator, one or more strain gauges, whose torsional deformation can be measured to deduce the torque delivered by the actuator. In a context where the actuator is a flight actuator in an aircraft, the use of strain gauges is however not desired, because these gauges are bonded to the output shaft, they are difficult to replace. In particular, they are not replaceable without disassembling the actuator of the aircraft: they are parts called "non-LRU", for the acronym Line-Replaceable Unit, or "non-replaceable online". Torsional deformation between two shafts can also be measured by the relative rotation between the shafts.
    [0004] Rotational sensors, for example inductive sensors or RVDT sensors, are known. These sensors comprise a rotor and a stator respectively connected to a free shaft and a torsion shaft driven by an actuator. A primary coil fed by an alternating current generates a magnetic field in a circuit formed by the rotor and the stator. Two secondary coils produce, in response to this magnetic field, respective voltages whose values depend on the angular position of the rotor relative to the stator.
    [0005] It can thus be deduced from the measurement of the voltages at the terminals of the secondary coils a relative rotation between the rotor and the stator. The known RVDT sensors are suitable for measuring angles of the order of ten degrees.
    [0006] In this case, the torsion angles to be measured on an output shaft of an aircraft flight actuator are very small, for example of the order of 1 ° or less. The use of a known RVDT sensor to measure a torsion angle of such a shaft would therefore have a very low sensitivity unless the stiffness of the output shaft is greatly reduced to increase the amplitude of the rotational movements. output. This is undesirable in the context of the invention. There is therefore a need for a torque sensor by measuring small deformations.
    [0007] SUMMARY OF THE INVENTION The object of the invention is to provide a rotation sensor having a higher sensitivity. Another object of the invention is to propose a torque sensor by measuring small amplitude deformations of a shaft.
    [0008] In this respect, the subject of the invention is a rotation sensor comprising: a stator and a coaxial rotor, the rotor being mounted with angular displacement with respect to the stator, the stator and the rotor forming a magnetic circuit, a winding primary, adapted to generate a magnetic field in the magnetic circuit when it is supplied by an alternating current, and - at least one secondary winding, adapted to present at its terminals a potential difference in response to a magnetic excitation, characterized in that that the magnetic circuit comprises at least one tooth extending radially relative to the axis of the stator and the rotor, and at least one notch 30 adapted to receive said tooth so that the tooth is separated from the notch by at least a so-called tangential air gap, variable as a function of the angular displacement of the rotor relative to the stator, 3025882 3 and in that the tooth and the notch are shaped so that a variation of width r of a tangential gap causes a variation of the potential difference across the secondary winding.
    [0009] Advantageously, but optionally, the rotation sensor according to the invention may further comprise at least one of the following features: the magnetic circuit comprises at least two teeth aligned axially and integral with each other; notch being adapted to receive the teeth so that each tooth is separated from the notch by at least one tangential air gap, the teeth and the notch being shaped so that when a tooth is separated from the notch by two Tangential gaps of identical widths, the other tooth is separated from the corresponding notch by two tangential air gaps of different widths, and preferably a gap has a width greater than or equal to twice the width of the other gap. the magnetic circuit comprises at least three teeth aligned axially and integral with each other, comprising a central tooth and two lateral teeth, the notch being adapted to receive the teeth so that each tooth is separated from the notch which receives it by at least one tangential air gap, the teeth and the notches being shaped so that: o when the central tooth is separated from the notch by two tangential air gaps of identical widths, each of the other two teeth is separated from the the widest gap extending between a lateral tooth and the notch is aligned with the narrowest air gap extending between the other lateral tooth and the notch. notch. The sensor comprises two secondary windings, each winding being adapted to have a variable potential difference as a function of the width value of the narrowest tangential air gap between a lateral tooth and the notch. - The lateral teeth have an angular opening smaller than or equal to half of the angular aperture of the central tooth. Each tooth is further separated from a surface of its respective slot by a so-called radial air gap, and the smallest tangential air gap between a lateral tooth and the notch has a width smaller than that of the radial air gap. One of the rotor or stator comprises at least two disks, each tooth being carried by a disk, and a cylinder extending between the disks, the primary winding and a secondary winding being wound around the cylinder. The secondary winding is wound around the cylinder and the primary winding is surrounded around the secondary winding. - The sensor further comprises an acquisition and processing unit, adapted to measure a voltage across the secondary windings and to derive an angle of rotation of the rotor relative to the stator.
    [0010] The invention also relates to an assembly comprising: - a torsion shaft and a free shaft, concentric and mounted to move angularly relative to each other, - an actuator, comprising a rotary output shaft driving the two shafts, and 20 - a rotation sensor according to the foregoing description, the rotor of the sensor being integral in rotation with the free shaft and the stator being integral in rotation with the torsion shaft, in which the unit of The acquisition and processing of the sensor is further adapted to determine, from an angle of rotation of the rotor, a torque experienced by the torsion shaft. The proposed rotation sensor makes it possible, by virtue of its structure comprising asymmetrical air gaps between the rotor and the stator, to detect even a relatively small relative rotation between the rotor and the stator. Thus it is possible to use such a sensor to measure a torque directly on the output shaft of an actuator without impacting its stiffness.
    [0011] DESCRIPTION OF THE FIGURES Other characteristics, objects and advantages of the invention will emerge from the description which follows, which is purely illustrative and nonlimiting, and which should be read with reference to the appended drawings in which: FIG. 1 is a perspective view of a rotation sensor according to an embodiment of the invention, - Figure 2a shows a sectional view of the sensor of Figure 1, - Figure 2b shows a perspective view of the rotor discs FIG. 2c represents a front view of the sensor of FIG. 1; FIG. 3a represents the magnetic permeance of the airgaps of a sensor according to one embodiment of the invention as a function of the relative rotation angle of the rotor and the stator. FIG. 3b shows the magnetic fluxes in the primary and secondary windings of the sensor as a function of the angle of rotation. FIG. 3c represents the voltages of the secondary windings of the sensor as a function of the angle of rotation, FIG. 3d represents the sensitivity of the sensor as a function of the angle of rotation, FIG. 3e represents the sensitivity of the sensor in FIG. function of a twisting force. - Figure 4 schematically shows an assembly comprising an actuator and a torque sensor.
    [0012] DETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT OF THE INVENTION Structure of the Torque Sensor Referring to FIG. 1, a rotation sensor 1 is shown.
    [0013] This sensor comprises a stator A, and a rotor B, which are two concentric pieces around an X-X axis. The rotor B is rotatably mounted relative to the stator A, or at least, given the small angles of rotation to be measured, mounted angularly with respect to the stator.
    [0014] Advantageously, but optionally, the stator A and the rotor B are parts of revolution about the axis X-X. The stator A and the rotor B together form a magnetic circuit. In this respect, they are formed of a magnetic material, for example iron.
    [0015] The rotation sensor 1 further comprises a primary winding 30, which is adapted to generate a magnetic field in the magnetic circuit in response to the application on the winding of an alternating current. The rotation sensor 1 finally comprises at least secondary winding 40, which is adapted to have a potential difference in response to magnetic excitation. In particular, the generation of a magnetic field in the magnetic circuit by the primary winding causes the appearance of a potential difference across the secondary winding. This potential difference varies as a function of the angular displacement of the rotor relative to the stator, as explained hereinafter, and is measured by a unit 50 for acquiring and processing the sensor 1, in order to deduce therefrom the angle of rotation of the rotor. rotor relative to the stator. Advantageously, and as shown in the figures, the rotor extends inside the stator being rotatably mounted therein. Alternatively, the rotor B could extend around the stator A.
    [0016] Thus, in order to preserve the generality of the invention, the radially external part is noted, this part being able to be the rotor or the stator, and the radially internal part. The radially inner part 20 comprises at least one disc 22 coaxial with the axis X-X. This part 20 preferably comprises two coaxial disks 22 and integral in rotation, and even more advantageously three disks 22 coaxial, and integral in rotation. In this case we note 22L the two side disks, and 22C the central disk, arranged between the side disks and at equal distances thereof. Advantageously, the lateral disks 22L are at the axial ends of the radially inner part 20, as can be seen for example in FIG. 2a.
    [0017] In the case where the radially inner part 20 comprises two disks 22, it further comprises a cylinder 23 extending the disks 22. In the preferred embodiment in which the part 20 comprises three disks, it comprises two cylinders 23, each cylinder extending between two adjacent disks. In this case, each cylinder 23 extends between the central disc 22C and a side disc 22L. The disks 22 are integral in rotation. Advantageously, to do this the discs 22 are formed in one piece with the intermediate cylinder (s) 23, so that all the discs 22 and cylinders 23 form a single piece. The discs 22 and the cylinders 23 of the rotor are formed of a magnetic material, for example iron. Advantageously, the radially inner part comprises a through opening 21 of circular and centered section, thus making this piece tubular and hollow, so as to be able to fix it to a shaft. In this case, if the shaft is rotatable, coupling means in rotation of the part 20 to the shaft are advantageously provided on the inner surface of the part, that is to say on the periphery of the opening 21.
    [0018] Around each cylinder 23 is wound a part of the primary winding 30 and a secondary winding 40. Advantageously, the cylinders 23 have a radius strictly less than the radii of the disks 22, thus forming notches in which the windings can be positioned.
    [0019] Moreover, as can be seen in FIG. 2a, each secondary winding 40 is advantageously wound directly around the respective cylinder 23, while the primary winding 30 is wound around the secondary windings, so as to successively obtain, with a radius increasing with respect to the axis XX: - A cylinder 23, 25 - A secondary winding 40, and - A primary winding portion 30. As explained below, the magnetic circuit created by the rotor and the stator during the excitation of the primary winding located at the radially outer ends of the disks 22, the primary winding 30 is thus closer to this circuit and the magnetic field leaks are reduced. It is thus clear that when the part 20 comprises two disks, it comprises a single secondary winding, and when it comprises three disks, it comprises two secondary windings wound around respective cylinders. This embodiment allows, as described below, to make the rotation measurement 3025882 8 insensitive to the excitation voltage, by performing a differential treatment between the voltages of the secondary windings. Magnetic circuit 5 The magnetic circuit comprises at least one tooth 220, extending radially with respect to the axis X-X, and a notch 12, adapted to receive said tooth. The tooth 220 is mounted to angularly move relative to the notch 12. Advantageously, the tooth 220 is integral with the rotor or the stator, and the notch 12 is integral with the stator or the rotor, so that a relative rotation of the rotor the stator 10 causes a rotation of the tooth relative to the notch. In the nonlimiting example that follows and shown in the figures, each tooth 220 is carried by a disk 22 of the radially inner part 20, and the notch 12 is carried by the radially outer part. Alternatively, the notch 12 could consist of a plurality of notches formed on the disks, the notches being identical and aligned, and the teeth could be formed on a radially inner surface of the outer part 10. To resume the As can be seen in FIG. 2c, the radially outer part 10 comprises, on a radially internal surface 11, at least 20 a notch 12, extending along an axis parallel to the axis XX, and having an angular opening. constant over its entire length, that is to say over its entire axial extension. Alternatively, a notch 12 may be formed by several identical notches and aligned with each other. Preferably, the radially outer piece 10 comprises a plurality of notches all identical and distributed at constant angular intervals on the circumference of its inner surface 11, and each disc 22 has a plurality of projecting teeth 220, the teeth being received in the notches 12 of the stator so that each notch of the stator receives a tooth 220 of each disk 22 of the rotor 20.
    [0020] Thus, if the outer part 10 comprises a plurality of notches 12 distributed angularly on the inner surface 11 of the stator, then each disk 22 comprises as many teeth 220, the teeth of the same disk being identical, and regularly distributed over the circumference of the disc so that all the teeth 220 are received in corresponding notches 12.
    [0021] As can be seen in FIG. 2c, each tooth 220 is thus separated from a wall of the notch 12 which receives it through a gap which comprises: two tangential air gaps 51 extending between the lateral walls 221 of a tooth and those 121 of the notch in which the tooth is located, the side walls being the walls extending in a plane parallel to the axis XX, and advantageously radial, the air gap is therefore measured orthogonally to this plane, c that is, it is tangential about the axis XX, - a first radial gap 52 at the tooth head 220, extending between a radially outer wall 222 of a tooth and the inner surface of the tooth. part 10 at the notch 12, and - A second radial air gap 53, extending between the inner surface 11 of the part 10 between two notches 12 consecutive and the outer surface 224 of the disc facing it.
    [0022] The teeth 220 and the notch sections are preferably shaped so that the widths of the tangential air gaps 51, measured orthogonally to the side walls of the teeth 220 and notches, are constant over the entire surface of the air gap.
    [0023] The sensor 1 comprises at least one tooth-notch pair shaped such that a rotation of the rotor relative to the stator causes a variation in width of a tangential air gap 51 between the tooth 220 and the notch 22, inducing a variation the potential difference across the secondary winding 40. Advantageously, with reference to Figures 2b and 2c, the magnetic circuit 25 comprises at least one tooth 220 shaped so that the tangential air gaps 51 extending on either side of the tooth have different widths. In addition, one of the tangential air gaps 53 advantageously has a width greater than or equal to at least twice the other tangential air gap, to minimize the magnetic field passing through the widest air gap.
    [0024] In this way, when the rotor rotates relative to the stator, the tooth 220 moves toward or away from the notch 12 at its narrowest tangential air gap, respectively causing an increase or a decrease in the permeability of the air gap, and therefore an increase or decrease in the voltage across the secondary winding. On the other hand, on the side of the larger air gap, the magnetic field passing through this air gap remains negligible irrespective of the angular displacement of the tooth in the notch. In the embodiment where the inner part 20 has two disks 22, the teeth 220 of a disk 22 are shaped so that the tangential air gaps 51 between each tooth 220 of the disk and the notch are asymmetrical with respect to the tooth when the tangential air gaps between the teeth of the other disc and the notch are symmetrical. The first disk, forming the asymmetric gaps, induced by its relative rotation in the outer part a variation of the magnetic field, and the second disk closes the magnetic circuit without impacting the field. In the preferred embodiment where the inner part 20 has three disks, the teeth 220L of the side disks 22L are shaped so that the tangential air gaps between each tooth 220L and the notch 12 are asymmetrical, in particular have different widths, when the tangential air gaps between the teeth 220C of the central disc 22 C and the notch are symmetrical. In addition, for each notch 12, the widest lateral air gap for the tooth 220L of a first side disc 22L corresponds to the narrowest air gap for the tooth 220L of the other side disc 22L. Thus the narrower air gap on the side of a first side disc is opposite the widest gap on the side of the other side disc. It has been indicated above that in this case the sensor comprises two secondary windings 40, each winding being wound around a respective cylinder. It is understood in this case that the secondary windings 40 are not subjected to the same magnetic field and therefore do not have the same potential difference across their terminals in the direction of rotation of the rotor relative to the stator. Indeed, for a side disc 22L, the narrowest tangential air gap is always on the same side with respect to a tooth. If the rotor rotates relative to the stator so as to decrease the width of the air gap, the permeance of this air gap 30 increases, and the voltage across the corresponding secondary winding also increases. However, the permeability of the narrowest tangential air gap of the other side disc 22L decreases with the rotation of the rotor, and therefore decreases the voltage across the corresponding secondary winding.
    [0025] Thus, this configuration makes it possible to vary the voltage at the terminals of each secondary winding as a function of the direction of rotation of the rotor, and thus to determine this direction of rotation from the voltage measured on the secondary windings.
    [0026] In this case, all the teeth 220L of a lateral disk 22L are shaped identically so that the widest air gap is always on the same side of the tooth, to maximize the variation of the permeability of the air gap. total between the disk and the outer part 10 in case of relative rotation of the two parts. In a preferred embodiment, the teeth 220L of the side disks 22L have a reduced angular aperture relative to the teeth 220C of the central disk. In the case where the sensor comprises only two disks, the teeth of the disk corresponding to asymmetric air gaps have a reduced angular aperture relative to the teeth of the other disk. Advantageously, the angular aperture of the teeth 220L of the two lateral discs is identical and less than or equal to 50%, and preferably less than 30%, of that of the teeth 220C of the central disc 22C. Moreover, in each notch, as shown in FIG. 2b, the teeth are advantageously arranged relatively to one another as follows: A first lateral wall 2211 of a tooth 220C of the central disk is aligned with a corresponding lateral wall of a tooth 220L of a first side disc, and - The opposite side wall 2212 of the tooth 220C is aligned with the corresponding side wall of the tooth 220L of the second side disc.
    [0027] The operation of this sensor will now be described. The description which follows relates to the preferred embodiment in which: the radially inner part comprises three disks, to differentiate the directions of rotation of the rotor, the radially inner part is the rotor, and the outer part is the 30 stator, and - the radially inner part 20 carries the teeth, and the outer part 10 the notches.
    [0028] The same operation would be obtained in the embodiments of the sensor in which the rotor and the stator are interchanged, and / or the provisions of the teeth and notches. The primary winding 30, powered by an electric current, generates in each cylinder a magnetic field. The magnetic field passes through each side disk and then to the stator through a gap. According to the configuration described above, the widest lateral gap of a tooth - e.g. the side opposite to that where the tooth walls of a side disc and the central disc are aligned - is sufficiently wide for the flow magnetic passing this gap is negligible. Then, the magnetic field generated by the primary winding favors, for each tooth of a lateral disk, the narrowest air gap. It then travels the stator, then a lateral air gap of a tooth of the central disc 15, which generates a voltage in the secondary winding between the central disc and the side disc concerned. However, the narrower air gap, also called measurement gap, is advantageously of a width of less than 0.5 mm, and advantageously of 0.3 mm when the relative rotation of the rotor and the stator is zero, it is that is, the air gaps on either side of a tooth of the central disk are equal. Because of this dimension, the permeance of the air gap varies significantly in case of rotation of the rotor in the stator, which induces a voltage variation in the secondary windings which allows to deduce the magnitude of the relative rotation of the rotor and stator.
    [0029] Finally, in each notch of the stator, as the narrowest air gaps are on the opposite sides for the teeth of the two side disks, the permeances of each gap (and therefore the corresponding secondary voltages) have slopes of opposite sign for relative rotation given, This allows to deduce the voltages across the secondary direction 30 and the absolute value of the relative rotation between the rotor and the stator. For example, on the configuration shown in Figure 2c: if the rotor rotates to the left side in the plane of the figure, the width of each measuring gap at the first side disc is reduced. The permeance of each gap is increased, and the voltage of the secondary winding corresponding to this disk increases. On the other side of the central disk is the other side disk (not visible). For this disc, the width of the measurement gap increases as the rotor rotates to the left, and thus its permeability decreases. As a result, the voltage of the secondary winding corresponding to this disk decreases. Thus by raising the voltages of the two secondary coils, we deduce the direction of rotation and the magnitude of rotation of the rotor in the stator.
    [0030] FIGS. 3a to 3e show experimental data of a sensor of the type described above. The dimensions of this sensor are an inside diameter (at the through opening 21) of 15 mm, and an outside diameter at the radially outer surface of the stator of 40 mm.
    [0031] The measuring gap of each tooth has a width of 0.3 mm when the air gaps on either side of the teeth of the central disk are equal. The tangential air gaps 52 and 53 have widths of 0.6 mm. Finally, the stator has four more and each disc has four teeth, the teeth of the side discs 22L having an angular aperture of 20% of those of the central disc 22C. FIG. 3a shows the permeance of the measuring gaps as a function of the angle of deformation. P22L1 and P22L2 were noted to be the permeations of the measurement gaps (the narrowest) of the two lateral disks and P22C the permeance of the central disk (cumulative permeances of the lateral air gaps).
    [0032] The pemance is provided by the formula: P = uls, where p is the magnetic permeability of the medium, S is the section of the air gap, and I is its width. It can be seen in FIG. 3a that the permeation of the air gaps of one lateral disc increases with the rotation angle when the permeance of the other disc decreases.
    [0033] FIG. 3b shows the values of the magnetic fluxes at the primary winding 30 and at the secondary windings 40, noting Op and Os the magnetic fluxes at the primary and the secondary windings, np and ns the number of turns of the corresponding windings, and i the current in the primary winding.
    [0034] Secondary magnetic flux varies according to the permeance of air gaps. FIG. 3c shows the values of the secondary voltages induced by the magnetic fluxes. It can be seen in the figure that the value of the voltage at each winding provides information both on the value of the angle of rotation between the rotor and the stator, but also on the direction of rotation. By expressing the sensitivity of the sensor in V / V / deg, this sensitivity is represented in FIG. 3d. Sensitivity of the sensor is observed at angles of 0.1 or 0.2 °, which demonstrates an increased accuracy compared to previously proposed RVDT sensors, for which the sensitivity was of the order of a few degrees. degrees. FIG. 4 shows the use of the sensor 1 for measuring the torque delivered by an actuator.
    [0035] FIG. 4 shows an assembly comprising an actuator 2, comprising a rotary output shaft 120 driving a torsion shaft 130, or test body, on which is mounted a load 4 to be driven. 131 shows the portion of the torsion shaft causing the load 4, and 132 the end portion of the shaft beyond the load, this portion not being subjected to the torque transmitted to the charge. The assembly further comprises a shaft 131 coaxial with the torsion shaft. This shaft 3 is not subjected to a couple, it does not deform. Both shafts are rotated by the output shaft of the actuator.
    [0036] The sensor is positioned so that the stator A is integral in rotation with one of the shafts, advantageously the torsion shaft, and the rotor B is integral in rotation with the other shaft, advantageously the free shaft. The sensor is disposed at the opposite end of the shafts with respect to the actuator so as not to impede the torque transmission between the actuator and the torsion shaft 3 to drive the load. The processing unit 50 of the sensor therefore measures a relative rotation between the free shaft and the torsion shaft. In this case where the rotation sensor is used as a torque sensor, the processing unit 50 is further adapted to deduce, from a relative angle value between the torsion shaft and the book shaft, a torque 3025882 applied by the actuator to the torsion shaft, depending on the stiffness of the torsion shaft, this torque being the result of the product of the stiffness by the absolute value of the measured angle. For a torsional stiffness of 3800 Nm / deg of the torsion shaft, a sensitivity of the torque sensor 1 is obtained, as a function of the force represented in FIG. 3e. This sensitivity corresponds to the slope of the voltages at the terminals of the secondary windings as a function of the torque applied by the actuator on the torsion shaft. Thus the proposed sensor has a high sensitivity for low rotations and thus allows to measure the torque delivered by an actuator without impacting the stiffness of its output shaft.
    权利要求:
    Claims (10)
    [0001]
    REVENDICATIONS1. Rotation sensor (1), comprising: - a coaxial stator (A) and a rotor (B), the rotor (B) being mounted angularly with respect to the stator (A), the stator (A) and the rotor ( B) forming a magnetic circuit (10, 20), - a primary winding (30), adapted to generate a magnetic field in the magnetic circuit when it is supplied with an alternating current, and - at least one secondary winding (40), adapted to present at its terminals a potential difference in response to a magnetic excitation, characterized in that the magnetic circuit comprises at least one tooth (220) extending radially relative to the axis (XX) of the stator and the rotor and at least one notch (12) adapted to receive said tooth so that the tooth is separated from the notch by at least one so-called tangential gap (51), variable as a function of the angular displacement of the rotor relative to the stator, and in that the tooth and the notch are shaped so that a variation of The width of a tangential air gap causes a variation of the potential difference across the secondary winding (40).
    [0002]
    2. Rotation sensor (1) according to claim 1, wherein the magnetic circuit comprises at least two teeth aligned (220) axially and integral with each other, the notch (12) being adapted to receive the teeth. so that each tooth is separated from the notch by at least one tangential gap (51), the teeth (220) and the notch (12) being shaped so that when a tooth (220) is separated from the notched by two tangential air gaps of identical widths, the other tooth is separated from the corresponding notch by two tangential air gaps of different widths, and preferably an air gap has a width greater than or equal to twice the width of the other air gap .
    [0003]
    3. Rotational sensor (1) according to one of claims 1 or 2, wherein the magnetic circuit (10, 20) comprises at least three aligned teeth (220L, 220C) axially and integral with each other, comprising a central tooth (220C) and two lateral teeth (220L), the notch (12) being adapted to receive the teeth so that each tooth is separated from the notch which receives it by at least one tangential gap, the teeth and the notches being shaped so that: - when the central tooth (220C) is separated from the notch (12) by two tangential air gaps (51C) of identical widths, each of the two other teeth (220L) is separated of the notch by two tangential air gaps (51L) of different widths, and - the widest air gap extending between a lateral tooth (220L) and the notch (12) is aligned with the narrowest gap extending between the other side tooth (220L) and the notch.
    [0004]
    4. The rotation sensor (1) according to claim 3, comprising two secondary windings (40), each winding being adapted to have a variable potential difference as a function of the width value of the tangential air gap (51L) plus narrow between a side tooth (220L) and the notch.
    [0005]
    5. Sensor (1) of rotation according to one of claims 3 or 4, wherein the side teeth (220L) have an angular aperture less than or equal to half the angular aperture of the central tooth (220C). 20
    [0006]
    6. Sensor (1) of rotation according to one of the preceding claims, wherein each tooth (220) is further separated from a surface of its respective notch by a so-called radial gap (52), wherein the smallest gap tangential (51L) between a lateral tooth (220L) and the notch has a width less than that of the radial gap (52).
    [0007]
    7. Sensor (1) of rotation according to one of claims 2 to 6, wherein one of the rotor (B) or the stator (A) comprises at least two discs (22), each tooth (220) being worn by a disk, and a cylinder (23) extending between the disks, the primary winding (30) and a secondary winding (40) being wound around the cylinder (23). 3025882 18
    [0008]
    The rotation sensor (1) according to claim 7, wherein the secondary winding (40) is wound around the cylinder (23) and the primary winding (30) is surrounded around the secondary winding (40). 5
    [0009]
    9. Sensor (1) of rotation according to one of the preceding claims, further comprising an acquisition unit and processing (50), adapted to measure a voltage across the secondary windings and to deduce an angle of rotation of the rotor relative to the stator. 10
    [0010]
    10. An assembly comprising: - a torsion shaft (130) and a free shaft (3), concentric and mounted to angularly move relative to each other, - an actuator (2), comprising an output shaft ( 120) rotating the two shafts (130, 3), and 15 - a rotation sensor (1) according to claim 9, the rotor (20) of the sensor being integral in rotation with the free shaft and the stator (10). being integral in rotation with the torsion shaft, wherein the sensor acquisition and processing unit (50) is further adapted to determine, from a rotor rotation angle, a torque experienced by the torsion shaft. the torsion shaft.
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    EP3767397A1|2021-01-20|Clock movement comprising a rotary element provided with a magnetic structure having a periodic configuration
    EP0845850A1|1998-06-03|Electromagnetic motor with two coaxial rotors
    FR2630542A1|1989-10-27|Inductive sensor with harmonic rejection for detecting the radial displacements of a rotor
    CH643041A5|1984-05-15|SUBCIRCULAR ROTOR.
    EP0519844A2|1992-12-23|Angle sensor with differential transformer
    WO2014135779A1|2014-09-12|Inductive angle sensor
    同族专利:
    公开号 | 公开日
    US20170254673A1|2017-09-07|
    US10352730B2|2019-07-16|
    EP3194917B1|2018-12-05|
    FR3025882B1|2017-09-08|
    CN106716091A|2017-05-24|
    WO2016041908A1|2016-03-24|
    CN106716091B|2019-08-16|
    EP3194917A1|2017-07-26|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB2050623A|1979-05-16|1981-01-07|Sangamo Weston|Torque sensing apparatus|
    US2498282A|1942-09-15|1950-02-21|Westinghouse Electric Corp|Torque measuring device for shafts|
    US2564484A|1947-10-15|1951-08-14|Gen Electric|Electrical torque meter|
    US2826064A|1954-02-18|1958-03-11|Bendix Aviat Corp|Transmission torque sensor|
    US4412198A|1981-12-14|1983-10-25|S. Himmelstein And Company|Rotary transformer|
    DE102005031086A1|2005-07-04|2007-01-18|Robert Bosch Gmbh|Sensor arrangement for detecting a difference angle|
    KR101098117B1|2007-07-04|2011-12-26|주식회사 만도|Torque Sensor and Electronic Power Steering Apparatus Having Same|
    CN101546947A|2009-05-05|2009-09-30|南京航空航天大学|Bearing-free switch reluctance motor and control method thereof|
    DE102009061032A1|2009-05-15|2010-11-18|Tyco Electronics Belgium Ec Bvba|Magnetoelectronic angle sensor, in particular reluctance resolver|
    KR101238549B1|2010-07-06|2013-02-28|엘지이노텍 주식회사|Torque sensor of steering system|
    CN102545519B|2011-03-30|2016-02-03|戴珊珊|Reluctance motor for alternating-current continuous torque permanent magnet switch and excited control method thereof|
    JP6191097B2|2012-03-16|2017-09-06|株式会社ジェイテクト|Torque sensor stator|FR3068465A1|2017-06-30|2019-01-04|Safran Electronics & Defense|MEASURING METHOD USING AN INDUCTIVE DISPLACEMENT SENSOR|
    CN107597313B|2017-10-27|2019-04-09|江西理工大学|Suitable for rotating the contact detecting and analysing system and its test method of grinding mill barrel|
    CN107520039B|2017-10-27|2019-03-15|江西理工大学|Suitable for rotating the roller monitoring device of grinding mill barrel|
    FR3079298B1|2018-03-23|2020-11-27|Safran Landing Systems|DEVICE FOR MEASURING A POSITION OF A MOBILE BODY IN RELATION TO A FIXED BODY|
    CN109000835B|2018-09-19|2020-09-11|西安旭彤电子科技股份有限公司|Dynamic differential torque sensor|
    法律状态:
    2015-08-27| PLFP| Fee payment|Year of fee payment: 2 |
    2016-03-18| PLSC| Search report ready|Effective date: 20160318 |
    2016-08-22| PLFP| Fee payment|Year of fee payment: 3 |
    2017-01-13| CJ| Change in legal form|Effective date: 20161214 |
    2017-01-13| CD| Change of name or company name|Owner name: SAGEM DEFENSE SECURITE, FR Effective date: 20161214 |
    2017-08-22| PLFP| Fee payment|Year of fee payment: 4 |
    2018-08-22| PLFP| Fee payment|Year of fee payment: 5 |
    2019-08-20| PLFP| Fee payment|Year of fee payment: 6 |
    2020-08-19| PLFP| Fee payment|Year of fee payment: 7 |
    2021-08-19| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1458647A|FR3025882B1|2014-09-15|2014-09-15|INDUCTIVE ROTATION SENSOR WITH IMPROVED PRECISION|FR1458647A| FR3025882B1|2014-09-15|2014-09-15|INDUCTIVE ROTATION SENSOR WITH IMPROVED PRECISION|
    EP15763002.1A| EP3194917B1|2014-09-15|2015-09-14|Inductive rotation sensor with enhanced precision|
    US15/510,953| US10352730B2|2014-09-15|2015-09-14|Inductive rotation sensor with improved accuracy|
    CN201580049452.1A| CN106716091B|2014-09-15|2015-09-14|With mentioning high-precision induction rotation sensor|
    PCT/EP2015/070976| WO2016041908A1|2014-09-15|2015-09-14|Inductive rotation sensor with improved accuracy|
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