• 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:
    Angle of rotation sensor comprising a stator element (12), a rotor element (14), the inductive coupling between the elements (14, 12) to grasp the angle of rotation. A measuring device (16) captures the angle of rotation as a function of the inductive coupling between the rotor element (14) and the stator element (12), having at least one transmitting coil (22, 23) for emitting electromagnetic alternating fields and at least two receiving coils (28a, 28b; 29a, 29b) for capturing electromagnetic alternating fields. The measuring device (16) excites at least one transmitting coil (22, 23) with at least two different frequencies to emit two alternating fields, and it demodulates the voltages induced in at least one of the two receiver coils (28a, 28b, 29a, 29b), to capture the two inductive couplings with the respective frequencies.
    公开号:FR3055962A1
    申请号:FR1758083
    申请日:2017-09-01
    公开日:2018-03-16
    发明作者:Fabian Utermoehlen；Ralf Kieser；Stefan Leidich
    申请人:Robert Bosch GmbH；
    IPC主号:
    专利说明:

    055 962
    58083 ® FRENCH REPUBLIC
    NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY
    COURBEVOIE © Publication number:
    (to be used only for reproduction orders) (© National registration number © IntCI 8 : G 01 D 5/20 (2017.01)
    PATENT INVENTION APPLICATION
    A1
    ©) Date of filing: 01.09.17. © Applicant (s): ROBERT BOSCH GMBH— DE. © Priority: 09.09.16 DE 102016217255.7. @ Inventor (s): UTERMOEHLEN FABIAN, KIESER RALF and LEIDICH STEFAN. (43 Date of public availability of the request: 16.03.18 Bulletin 18/11. ©) List of documents cited in the report preliminary research: The latter was not established on the date of publication of the request. (© References to other national documents @ Holder (s): ROBERT BOSCH GMBH. related: ©) Extension request (s): @ Agent (s): CABINET HERRBURGER.
    104 / ROTATION ANGLE SENSOR.
    FR 3 055 962 - A1
    Rotation angle sensor comprising a stator element (12), a rotor element (14), the inductive coupling between the elements (14, 12) to capture the angle of rotation. A measuring installation (16) captures the angle of rotation as a function of the inductive coupling between the rotor element (14) and the stator element (12), having at least one emitting coil (22, 23) for emitting electromagnetic alternating fields and at least two receiving coils (28a, 28b; 29a, 29b) for capturing electromagnetic alternating fields. The measuring installation (16) excites at least one transmitting coil (22, 23) with at least two different frequencies to transmit two alternating fields, and demodulates the voltages induced in at least one of the two receiving coils (28a, 28b; 29a, 29b), to enter the two inductive couplings using the respective frequencies.

    Field of the invention
    The present invention relates to a rotation angle sensor comprising a stator element and a rotor element rotating about an axis relative to the stator element, the stator element and the rotor element being connected by inductive coupling.
    The invention also relates to a stator element for such a rotation angle sensor.
    State of the art
    Such a rotation angle sensor is for example known according to the state of the art. By installing transmitter and receiver coils on the stator of a rotation angle sensor which is induction coupled to a target carried by the rotor, the emission of an electromagnetic alternating field by the transmitter coil of at least l 'one of the two emitting coils in which different AC voltages are induced, allows the angle of rotation to be entered as a function of the induced AC voltages.
    Such an angle sensor is for example known according to document EP 0 909 955 B1. This document describes in particular the entry of the angle of rotation by the inductive coupling between the rotor and the stator.
    This document also describes the details of the arrangement of a transmitting coil, two receiving coils and at least one electrically conductive segment to determine the angle of rotation.
    In the case of real sensors, there may be measurement faults caused by external disturbances. Such disturbances are for example parasitic signals which influence the electromagnetic alternating field in the receiving coils. Other disturbances can be caused by the mounting tolerances such as the tilting of the target with respect to the axis of rotation of the angle of rotation sensor. When such a sensor is used in an external electromagnetic alternating field, spurious signals of a frequency analogous to the operating frequency, in particular in the range of +/- 100 kHz, can interfere with its operating frequency and combine the alternating fields. . By combining the alternating field in the voltage induced in the receiving coil, if necessary, one can distinguish an induced voltage with or without interference signal, which risks reducing the accuracy of the measurement.
    Purpose of the invention
    The present invention aims to develop a robust angle of rotation sensor with regard to such measurement errors.
    Presentation and advantages of the invention
    To this end, the invention relates to a rotation angle sensor comprising:
    a stator element, a rotor element rotatably mounted about an axis of rotation relative to the stator element, the inductive coupling between the rotor element and the stator element making it possible to grasp the angle of rotation, and a measuring installation for capturing the angle of rotation as a function of the inductive coupling between the rotor element and the stator element, the stator element having at least one emitting coil for emitting electromagnetic alternating fields and at least two receiving coils to capture electromagnetic alternating fields, the measuring installation exciting at least one transmitting coil with at least two different frequencies to emit at least two electromagnetic alternating fields, the measuring installation demodulating the alternating voltages induced in at at least one of the two receiving coils by the emission of at least two electromagnetic alternating fields ics, to capture at least the two inductive couplings using the respective frequencies of the two electromagnetic alternating fields.
    In other words, the subject of the invention is a rotation angle sensor having a stator element and a rotor element rotatably mounted about an axis of rotation relative to the stator element, as well as '' a measuring installation. The angle of rotation is captured by the inductive coupling between the rotor element and the stator element. The measuring installation captures the angle of rotation which depends on the inductive coupling between the rotor element and the stator element. The stator element has at least one transmitting coil for emitting electromagnetic alternating fields and at least two receiving coils for capturing electromagnetic alternating fields. The measuring installation excites at least one transmitting coil with at least two different frequencies to emit at least two electromagnetic alternating fields. The measuring installation demodulates at least two alternating voltages induced in at least one of the two receiving coils by the emission of at least two electromagnetic alternating fields, to capture at least two inductive couplings with the respective frequencies of at least two electromagnetic alternating fields.
    The rotor element has at least one electrically conductive segment. Such an electroconductive segment is for example inductively coupled by a respective take-up coil so that on the emission of an electromagnetic alternating field, the send-out coil induces an alternating voltage in the respective take-up coil.
    The electrically conductive segment is for example installed on the rotor element so that the alternating voltage induced in the respective take-up coil depends mainly mainly on the angle of rotation between the stator element and the rotor element.
    The angular input transmitting coil is for example supplied with an alternating voltage whose amplitude is in a range between 0.5 V and 10 V and which is preferably equal to 1.5 V for frequencies of the order a few MHz, preferably between 4 MHz and 6 MHz.
    Advantageously, the measurement installation comprises a frequency generator, in particular a digital frequency generator, which emits electromagnetic alternating fields at different frequencies by a transmitting coil, to predefine a large number of frequencies, in particular frequencies varying in continued. The measuring installation includes a demodulator for demodulating the alternating voltages induced at different frequencies by electromagnetic alternating fields using a predefined frequency.
    A large number as indicated above means that there are at least two frequencies and preferably at least three frequencies predefined by the frequency generator.
    The frequency generator which is in particular a digital frequency generator makes it possible, in a particularly simple way, to predefine a large number of different frequencies. For example, the frequencies are predefined in a frequency band of a few kHz, for example in a frequency band with a width of 500 kHz or 400 kHz in the frequency range between 4 MHz and 6 MHz. According to the preset frequency, there will be emission of the electromagnetic alternating field at this frequency. During this, the inductive coupling will be captured using at least one alternating voltage induced in one of the two receiving coils. Then the steps are repeated. The frequency variation can be done according to an increasing or decreasing ramp or an ascending or descending staircase. This variation can also be done randomly.
    The expression “continuous” within the meaning of the present description means that there are no sudden variations between two given frequencies or only small variations. For example, if you preset frequencies at an interval of 50 KHz, then you avoid signal variations and damping that make measurements inaccurate.
    Preferably, the stator element has a first transmitting coil, a second transmitting coil and at least two receiving coils. The first emitting coil sends a first electromagnetic alternating field. The second emitting coil sends a second electromagnetic alternating field, the frequency of which differs from that of the first electromagnetic alternating field, in particular by at least 5%.
    With two emitting coils emitting different electromagnetic alternating fields, alternating electromagnetic fields can be used at different frequencies to measure the angle of rotation. A spurious signal having a frequency close to one of the frequencies of the electromagnetic alternating fields will have a disturbing influence only on one of the electromagnetic alternating fields used for the measurement. If you predefine more than two frequencies, you can recognize a faulty voltage by the deviation from the other two voltages. This reduces the sensitivity or disturbance of the rotation angle sensor to a spurious signal having a frequency close to the frequency of one of the electromagnetic alternating fields.
    Preferably, the measurement installation comprises a first resonant circuit for generating a first electromagnetic alternating field at a first instant with a first frequency. The measurement installation comprises a second resonant circuit for generating a second electromagnetic alternating field at a second instant different from the first instant and with a second frequency.
    The resonant circuits for generating the electromagnetic alternating fields are simple to produce. For predetermined, fixed frequencies, this constitutes an economical, space-saving alternative to expensive circuits.
    Advantageously, the rotation angle sensor comprises a demodulator which demodulates a first alternating voltage induced in the respective receiving coil, with a first frequency and a second alternating voltage induced in the respective receiving coil, one demodulates at the second frequency. For predefined fixed frequencies, this constitutes an economical and space-saving solution compared to complex circuits.
    Advantageously, the stator element has at least two first receiver coils and at least two second receiver coils. The first two take-up coils are used to input one of the alternating voltages induced at the first frequency of the first electromagnetic alternating field and the two second take-up coils are used to input a second alternating voltage induced at the second frequency of the second field electromagnetic alternative. This means in this context that the respective coil is optimized for two receiving frequencies. The actual coils have, besides a desired, appropriate inductance, also another electrical property, in the general case not desired, such as for example an electrical resistance, stray capacitances and thus they form an oscillating circuit with a resonant electrical cell. For example, a certain coil has its own resonance which is a frequency equal to at least four times the receiving frequency. This avoids the annoying effects linked to the own resonance.
    Advantageously, the measuring installation comprises a first resonant circuit for generating an electromagnetic alternating field at a first instant with a first frequency and this measuring installation also comprises a second resonant circuit for generating a second electromagnetic alternating field at a second instant different from the first instant and at a second frequency.
    Resonant circuits allow the electromagnetic alternating fields to be produced in a simple manner. For predefined fixed frequencies, this constitutes an economical, space-saving solution compared to complicated and expensive circuits.
    Advantageously, the measuring installation includes a demodulator for demodulating the first alternating voltage induced using the first frequency and the second alternating voltage induced with the second frequency. For predefined variable frequencies, this constitutes an alternative, economical, space-saving solution compared to complicated circuits.
    Advantageously, the demodulator demodulates the first induced alternating voltage as input signal of at least one of the first two receiving coils at the first frequency and the second induced alternating voltage as input signal of at least the one of the two second receiver coils, to demodulate with the second frequency.
    The signal paths for the measurement are thus separated. Such a redundant system can also be used to monitor or detect faults in the sensor.
    Advantageously, the rotation angle sensor comprises at least one resonant circuit for generating the respective frequency, this resonant circuit comprising at least one emitting coil, in particular as part of an LC oscillating circuit. This is a space-saving solution for complicated circuits.
    Advantageously, the resonant circuit has at least one variable capacity diode connected in parallel to at least one of the emitting coils and the respective frequency is defined by the variable capacity diode. The variable capacitance diode is an electronic semiconductor. By modifying the voltage applied to the Varicap diode, the capacity of the diode is modified.
    There is thus an electrically controlled capacitance which allows the resonant circuit to be easily tuned by an electric control.
    Advantageously, a set of frequencies is predefined, in particular in the range between 4 MHz and 6 MHz.
    The invention also applies to a stator element as described above for a rotation angle sensor.
    Drawings
    The present invention will be described below in more detail with the aid of examples of angle of rotation sensors represented in the appended drawings in which:
    Figure 1 is a schematic side view of a part of a first embodiment of a rotation angle sensor, Figure 2 is a schematic top view of a part of the first embodiment of the sensor angle of rotation, Figure 3 is a schematic view of the first embodiment of a part of the speed sensor and a part of a measuring installation, Figure 4 is a schematic side view of part of a second embodiment of a rotation angle sensor, FIG. 5 is a schematic view of part of a second embodiment of the angle sensor and of the measuring installation , Figure 6 is a schematic side view of a part of a third embodiment of a rotation angle sensor, Figure 7 is a schematic view of a part of the third embodiment of the angle sensor angle of rotation and measuring installation , Figure 8 is a schematic view of part of a resonant circuit.
    Description of embodiments
    FIG. 1 schematically shows a view of a part of a rotation angle sensor 10 corresponding to a first embodiment, the assembly being in side view. The rotation angle sensor 10 comprises a stator element 12 and a rotor element 14 rotatably mounted relative to the stator element 12 about an axis of rotation A.
    The angle of rotation is captured by the inductive coupling between the rotor element 14 and the stator element 12.
    Thus, the stator element 12 comprises for example at least one transmitting coil 22 shown in FIG. 1 for emitting an electromagnetic alternating field and at least two receiving coils 28a, 28b for capturing electromagnetic alternating fields. The two receiving coils 28a, 28b are for example located in a plane perpendicular to the axis of rotation A, in the radial direction relative to the axis of rotation A in the same plane of the circuit board. The transmitting coil 22 is located outside the respective receiving coils 28a, 28b in the radial direction, with respect to the axis of rotation A.
    The expressions “radial” or “radial arrangement” mean a disposition or a radiating orientation starting from the axis of rotation A. The expressions “peripheral” or “in the peripheral direction” mean in the following that it is a question of the circular or peripheral direction in a plane perpendicular to the axis of rotation A. "Axial direction" means a direction along the axis of rotation A.
    A sensor circuit board for the angle of rotation sensor 10 comprises for example at least one transmitting coil 22, in rotation, which comprises one or more windings and is preferably produced in the form of a planar coil. The windings can advantageously be made in several planes of a circuit board with several layers, to generate a sufficiently large alternating electromagnetic field and a sufficiently large inductance. The emitting coil 22 is supplied by an alternating voltage which has amplitudes of the order of 0.5 V - 10 V and preferably equal to 1.5 V for frequencies of a few MHz.
    The rotor element 14 has at least one electrically conductive segment 26. This electrically conductive segment 26 is coupled by induction to at least two receiver coils 28a, 28b so that the emission of an electromagnetic alternating field by at least one transmitter coil 22 induce at least two alternating voltages in the two receiving coils 28a, 28b.
    The electroconductive segment 26 is installed on the rotor element 14 so that the first two alternating voltages induced at least in the two receiving coils 28a, 28b depend mainly on the angle of rotation between the stator element 12 and the rotor element 14. The details of the arrangement of the transmitting coil 22 and of the two receiving coils 28a, 28b as well as of the electroconductive segment 26 and details of determination of the angle of rotation correspond to what has already been mentioned. above.
    FIG. 2 schematically shows a top view of part of the rotation angle sensor according to the first embodiment.
    The coil device 20 comprises at least two receiving coils 28a, 28b and at least one transmitting coil 22 shown schematically in Figure 2 in the form of circular rings. In the embodiment of Figure 2, there is provided an electrically conductive segment 26 which, in a plane perpendicular to the axis of rotation A, is practically in the form of the outer contour of a Maltese cross and the center is located on the axis of rotation A. Preferably, the electrically conductive segment 26 is a piece of stamped sheet metal, electrically conductive. The form described above is an example and other forms than the cruciform form described are possible.
    The electroconductive segment 26 can only be adapted to the shape of the outer peripheral edge or the surface having the shape given by the outer outline can be partially or completely filled.
    FIG. 3 schematically shows a view of a part of the rotation angle sensor 10 and of a part of a measuring installation 16 corresponding to a first embodiment. In FIG. 3, by way of example, there is a first take-up reel 28a which consists of at least two take-up coils 28a, 28b. For the second take-up reel 28b or for each of the other two take-up reels 28a, 28b, an appropriate arrangement can be provided.
    The measuring installation 16 captures the angle of rotation as a function of the inductive coupling between the rotor element 14 and the stator element 12. The measuring installation 16 excites the emission coil 22 by at least two frequencies different to emit at least two electromagnetic alternating fields. The measuring installation 16 emits the two electromagnetic alternating fields to induce alternating voltages in at least one of the two receiving coils 28a, 28b to capture at least two inductive couplings using the respective frequencies of the two electromagnetic alternating fields for demodulate them. This means that the induced alternating voltage U will be demodulated at the frequency at which the electromagnetic alternating field W has been excited to induce the voltage.
    The measurement installation 16 comprises a frequency generator 17, in particular a digital frequency generator 17, which makes it possible to predefine a large number of variable frequencies f, in particular continuously variable. Thanks to the frequency generator 17, the alternating voltage Uf emitted at the frequency f excites the emission coil 22 to emit electromagnetic alternating fields W at different frequencies f.
    The measurement installation 16 further comprises a demodulator 18 for demodulating the alternating voltages U induced by the electromagnetic alternating fields W of different frequencies f, for demodulating them at the respective frequency f.
    The input of the demodulator 18 receives both the induced alternating voltage U as well as the alternating voltage Uf. Provision may be made to amplify the induced alternating voltage U before or in the demodulator 18 by a signal amplifier. The demodulator 18 comprises for example a mixer (not shown) which mixes the alternating voltage Uf and the induced alternating voltage U. As the mixer of this exemplary embodiment as well as in other embodiments, a component usual in the technique is used. communication to convert the frequency of electrical signals. This component is formed in a known manner from electronic components such as diodes and transistors. For digital signal processing, the mixer can also be formed from a program in a signal processor. The mixed signal is for example applied by a low-pass filter to a signal input, for example an analog / digital converter. This means that the alternating voltage Uf and the induced voltage U will be mixed in the baseband. This separates the useful signal from the carrier. The signal thus obtained in the baseband will then be filtered by a low-pass filter and then recovered.
    By using the captured signals, one can determine the amplitude and phase of the inductive coupling of the angle of rotation.
    Figure 4 is schematically a side view of part of a second embodiment of a rotation angle sensor
    10. The elements of this embodiment which correspond to those of the embodiment described above bear the same references.
    The rotation angle sensor 10 according to this second embodiment comprises a first transmitting coil 22, a second transmitting coil 23 and at least two receiving coils 28a, 28b. The first transmitting coil 22 and the second transmitting coil 23 are for example located in a plane perpendicular to the axis of rotation A, being in the same plane of the circuit board, perpendicular to the axis of rotation and in the direction radial with respect to the axis of rotation A. The emitting coils 22, 23 are located in the radial direction with respect to the axis of rotation, beyond the respective receiving coils 28a, 28b.
    FIG. 5 is the diagram of a part of the rotation angle sensor 10 and of a part of the measurement installation 16 according to the second embodiment. The elements of this embodiment which correspond to those of the previous embodiment bear the same references. FIG. 5 shows by way of example a first take-up reel 28a representing the two take-up coils 28a, 28b. For the second take-up reel 28b or any other take-up reel from among the two take-up reels 28a, 28b, there may be a corresponding arrangement.
    The measuring installation 16 comprises a first resonant circuit 47a for generating a first electromagnetic alternating field W1 at a first instant with a first frequency f1. The measurement installation 16 also includes a second resonant circuit 47b for generating a second electromagnetic alternating field W2 at a second instant different from the first instant and at a second frequency f2.
    The first emitting coil 22 is controlled by the first resonant circuit 47a at the first alternating voltage Ufl; it emits the first electromagnetic alternating field W1. The second emitting coil 23 is controlled by the second resonant circuit 47b with a second alternating voltage Uf2 to emit the second electromagnetic alternating field W2.
    The frequency of the first electromagnetic alternating field W1 and that of the second electromagnetic alternating field W2 differ in particular by at least 5%.
    Unlike the first embodiment, in the demodulator 18, demodulates the first induced alternating voltage U1 generated by the first two receiver coils 28a, 28b at the first frequency f1 and demodulates the second alternating voltage U2 induced in at least the one of the two receiving coils 28a, 28b using the second frequency f2.
    For this, for example, the first resonant circuit 47a and the second resonant circuit 47b, on the output side, are connected to two different inputs of a mixer (not shown) of the demodulator 18.
    The input of the mixer for the induced voltage remains unchanged compared to that of the first embodiment. The mixer of the demodulator 18 mixes either the first alternating voltage Ufl with the first induced alternating voltage U1 or the second alternating voltage Uf2 with the second induced alternating voltage U2. The demodulator 18 receives on the same input, the first induced alternating voltage U1 or the second induced alternating voltage U2.
    Due to the time lag of the alternating voltages emitted, depending on the instant, there will for example be the first alternating voltage Ufl and the first induced alternating voltage U1 applied to the mixer or else the second alternating voltage Uf2 and the second induced alternating voltage U2 . The measuring installation 16 comprises for example a clock for controlling over time, the resonant circuits 47a, 47b.
    The other stages of signal processing are carried out as described for the first embodiment so that the induced voltages can be exploited successively.
    FIG. 6 schematically shows a view of a part of a rotation angle sensor corresponding to a third embodiment, in side view. The elements of this embodiment which correspond to those of the embodiments previously described bear the same references.
    The stator element 12 has at least two first receiver coils 28a, 28b and at least two second receiver coils 29a, 29b. The first two receiver coils 28a, 28b are used to input a first induced alternating voltage U1 at the first frequency fl of the first electromagnetic alternating field Wl. The second receiving coils 29a, 29b are used to capture the second induced alternating voltage U2, at the second frequency f2 of the second electromagnetic alternating field W2. The first two receiving coils 28a, 28b and the two second receiving coils 29a, 29b are in this example oriented perpendicular to the axis of rotation A in the radial direction relative to the axis of rotation A, being located for example in the same plane or in different planes of the circuit board. The emitting coils 22, 23 are located in the radial direction relative to the axis of rotation A, beyond the receiving coils 28a, 28b, 29a, 29b. This means in this context that for all embodiments, the respective coil is optimized for the respective reception frequency. The real coils have, in addition to the desired inductance, proper, also other electrical properties not required in the case of regulation, such as an electrical resistance, parasitic capacitances and thus forming an oscillating circuit having at least an electrical resonance point (own resonance). For example, a suitable coil has a natural resonant frequency which is at least four times the receiving frequency. This avoids the annoying effects linked to the own resonance.
    FIG. 7 schematically shows a view of part of the rotation angle sensor and part of a measurement installation corresponding to a third embodiment. The elements of this embodiment which correspond to those previously described bear the same references. FIG. 7 shows as an example of an embodiment the first take-up reel 28a of the assembly of the first two take-up reels 28a, 28b. For the second take-up reel 28b of this set of two take-up coils 28a, 28b or any other take-up reel of a set of take-up coils 28a, 28b, a corresponding arrangement can be provided. In FIG. 7, a first take-up coil 29a of the set of two second take-up coils 29a, 29b has been shown by way of example. For the second take-up reel 29b of the set of two take-up reels 29a, 29b or for any other take-up reel of a set of second take-up coils 29a, 29b, an appropriate arrangement can be provided.
    The measurement installation 16 comprises, as in the second embodiment, a first resonant circuit 47a and a second resonant circuit 47b.
    The measurement installation 16 comprises the demodulator 18 which, unlike the embodiments described above, has a first input for the first induced alternating voltage U1 and a second input for the second induced alternating voltage U2.
    The demodulator 18 demodulates the first induced alternating voltage U1 with the first frequency f1 and the second induced alternating voltage U2 with the second frequency f2.
    By way of example, the demodulator 18 comprises two mixers, not shown. A first mixer processes as described in the first embodiment, the first alternating voltage Ufl with the first induced alternating voltage Ul. The second mixer processes as described in the first embodiment, the second alternating voltage Uf2 with the second induced alternating voltage U2.
    The other stages of signal processing are carried out in each of the mixers, for example as in the first embodiment described.
    This means that the demodulator 18 demodulates the first induced alternating voltage U1 as input signal from at least one of the two receiving coils 28a, 28b with the first frequency fl and the second induced alternating voltage U2 as input signal d 'at least one of the two receiving coils 29a, 29b with the second frequency f2.
    FIG. 8 schematically shows a view of a part of a resonant circuit 47a, 47b given by way of example. The elements of this embodiment which correspond to those already described, have the same references.
    The resonant circuit 47a, 47b comprises a Varicap V diode which is parallel to at least one of the emitting coils 22, 23. The control voltage Us is applied to the Varicap V diode by the decoupling inductor LB. The two are connected by a coupling capacitor CK to an oscillating circuit 81. This consists of capacitance C and the respective emitting coils 22, 23.
    The respective frequency f of this circuit is determined by the Varicap V diode. The frequency can vary between around 200 kHz up to 1 MHz thanks to the Varicap diode.
    The assembly described uses a frequency generator or a resonant circuit. Other clocks such as RC oscillators or crystal oscillators can also be used to control or preset the frequency. The variation of the frequency can also be obtained by modifying components other than influencing the Varicap diode. In the case of RC oscillators, the intensity of the current or the value of the resistance can be influenced by means of an adjustable current source.
    A digital frequency generator can be provided which varies the frequency by digital frequency synthesis.
    In this case, you can use the crystal oscillator or the RC oscillation as a clock. The respective frequency f is generated by the digital frequency generator using an adjustable oscillator. The output signal of the adjustable oscillator is generated in that the clock predefines the main frequency which is reduced by a digital divider giving the frequency. The output signal is compared to the high frequency by a phase comparator. Possible phase errors are used to control the adjustable oscillator. By this reaction, almost any io frequency can be generated at clock accuracy. Direct use of the adjustable oscillator is also possible if its frequency stability, generally reduced, is sufficient for the application.
    In the resonant circuits 47a, 47b described, the transmitting coil 22, 23 is also used as an element fixing the frequency. Thus, one compensates for the parasitic influences which make vary the frequency and which are not critical with the first order.
    NOMENCLATURE OF MAIN ELEMENTS 1012141617182022232628a, 28b29a29b47a47b81 Angle of rotation sensorStator elementRotor elementMeasuring installationFrequency generatorDemodulatorCoil deviceFirst emitting coilSecond emitting coilElectrically conductive segmentTake-up coilsFirst take-up reelSecond take-up reelFirst resonant circuitSecond resonant circuitOscillating circuit ATVSCKLCfflf2UUlU2UfUflUf2LBVw Rotation axisCapacityCoupling capacitorOscillating circuitModulation / demodulation frequencyFirst frequencySecond frequencyInduced AC voltageFirst alternating voltage induced at the first frequency fl Second alternating voltage induced at the frequency f2Induced AC voltageFirst AC voltageSecond AC voltageDecoupling inductorVaricap diodeElectromagnetic alternating field
    W1
    W2
    First electromagnetic alternating field Second electromagnetic alternating field
    权利要求:
    Claims (13)
    [1" id="c-fr-0001]
    1 °) Angle of rotation sensor (10) comprising:
    - a stator element (12), a rotor element (14) rotatably mounted about an axis of rotation (A) relative to the stator element (12), the inductive coupling between the rotor element (14) and the stator element (12) making it possible to grasp the angle of rotation, and
    - a measuring installation (16) for entering the angle of rotation as a function of the inductive coupling between the rotor element (14) and the stator element (12),
    - the stator element (12) having at least one transmitting coil (22, 23) for emitting electromagnetic alternating fields and at least two receiving coils (28a, 28b; 29a, 29b) for capturing electromagnetic alternating fields,
    - the measuring installation (16) exciting at least one transmitting coil (22, 23) with at least two different frequencies to emit at least two electromagnetic alternating fields,
    - the measuring installation (16) demodulating the alternating voltages induced in at least one of the two receiving coils (28a, 28b; 29a, 29b) by the emission of at least two electromagnetic alternating fields, to capture at least the two inductive couplings using the respective frequencies of the two electromagnetic alternating fields.
    [2" id="c-fr-0002]
    2) angle of rotation sensor (10) according to claim 1, characterized in that the measuring installation (16) comprises a frequency generator (17), in particular a digital frequency generator (17) for transmitting electromagnetic alternating fields of different frequencies to predefine by at least one transmitting coil (22, 23), a set of frequencies which, in particular, vary continuously, the measuring installation (16) comprising a demodulator (18) for demodulating the voltages alternatives induced by alternating electromagnetic fields of different frequencies using the predefined frequency each time.
    [3" id="c-fr-0003]
    3 °) angle of rotation sensor (10) according to claim 1, characterized in that the stator element (12) has a first transmitting coil (22) and a second transmitting coil (23) and at least two coils receivers (28a, 28b; 29a, 29b), * the first emitting coil (22) emitting a first electromagnetic alternating field, * the second emitting coil (23) emitting a second electromagnetic alternating field whose frequency is different from that of the first field electromagnetic AC, the difference being in particular at least 5%.
    [4" id="c-fr-0004]
    4 °) angle of rotation sensor (10) according to claim 3, characterized in that the measuring installation (16) comprises a first resonant circuit (47a) for generating a first electromagnetic alternating field at a first instant with a first frequency and the measuring installation (16) has a second resonant circuit (47b) for generating a second electromagnetic alternating field at a second instant different from the first instant and with a second frequency.
    [5" id="c-fr-0005]
    5 °) rotation angle sensor (10) according to claim 4, characterized in that the rotation angle generator (10) comprises a demodulator (18) which demodulates with the first frequency, the first induced alternating voltage supplied by the respective take-up coil (28a, 28b) and the second alternating voltage induced using the second frequency, this voltage being supplied by the respective take-up coil (28a, 28b).
    [6" id="c-fr-0006]
    6 °) rotation angle sensor (10) according to claim 3, characterized in that the stator element (12) has at least two first receiver coils (28a, 28b) and at least two second receiver coils (29a , 29b), the first two receiving coils (28a, 28b) used to capture a first induced alternating voltage with the first frequency of the first electromagnetic alternating field and the second receiving coils (29a, 29b) entering the second induced alternating voltage at the frequency of the second electromagnetic alternating field.
    [7" id="c-fr-0007]
    7 °) angle of rotation sensor (10) according to claim 6, characterized in that the measuring installation (16) has a first resonant circuit (47a) for generating the first electromagnetic alternating field at a first instant with the first frequency and the measuring installation (16) has a second resonant circuit (47b) for generating the second alternating electromagnetic field at a second instant different from the first instant and with a second frequency.
    [8" id="c-fr-0008]
    8 °) angle of rotation sensor (10) according to claim 7, characterized in that the measuring installation (16) comprises a demodulator (18) for demodulating the first induced alternating voltage using the first frequency and the second alternating voltage induced with the second frequency.
    [9" id="c-fr-0009]
    9 °) angle of rotation sensor (10) according to claim 8, characterized in that the demodulator (18) demodulates the first induced alternating voltage as input signal from at least one of the first two receiving coils ( 28a, 28b) at the first frequency and the second alternating voltage induced as input signal from at least one of the two second receiving coils (29a, 29b) at the second frequency.
    [10" id="c-fr-0010]
    10 °) angle of rotation sensor (10) according to one of claims 3 to 9, characterized in that the angle of rotation sensor (10) comprises at least one resonant circuit (47a, 47b) for generating a respective frequency, at least one resonant circuit (47a, 47b) comprising at least one transmitting coil (22, 23), in particular a part of at least one LC oscillating circuit (81).
    [11" id="c-fr-0011]
    11 °) angle of rotation sensor (10) according to one of claims 3 to 10, characterized in that the resonant circuit (47a, 47b) comprises at least one Varicap diode (V) connected in parallel on at least one transmitter coil (22, 23), the respective frequency being determined by the Varicap diode (V).
    [12" id="c-fr-0012]
    12 °) angle of rotation sensor (10) according to one of the preceding claims, characterized in that a large number of frequencies are predefined, in particular in the range from 4 MHz to 6 MHz.
    [13" id="c-fr-0013]
    13 °) stator element (12) for an inductive angle of rotation sensor (10) comprising:
    a measuring installation (16), at least one transmitting coil (22, 23) for emitting at least one electromagnetic alternating field, at least two receiving coils (28a, 28b; 29a, 29b) for capturing electromagnetic alternating fields, at least a transmitting coil (22, 23) for emitting at least one electromagnetic alternating field excited by the measuring installation (16), the measuring installation (16) exciting at least one transmitting coil (22, 23) with at least two electromagnetic alternating fields of different frequency, the measuring installation (16) demodulating at least two alternating voltages induced in at least two receiving coils (28a, 28b; 29a, 29b) by the emission of at least two electromagnetic alternating fields, to enter at least two inductive couplings using the respective frequency of the two electromagnetic alternating fields.
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    同族专利:
    公开号 | 公开日
    US10955262B2|2021-03-23|
    CN109952492B|2021-07-20|
    WO2018046256A1|2018-03-15|
    FR3055962B1|2020-05-08|
    KR20190043559A|2019-04-26|
    CN109952492A|2019-06-28|
    EP3510361B1|2021-01-27|
    EP3510361A1|2019-07-17|
    US20190242726A1|2019-08-08|
    DE102016217255A1|2018-03-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4829250A|1988-02-10|1989-05-09|Honeywell, Inc.|Magnetic direction finding device with improved accuracy|
    FR2637683B1|1988-10-10|1994-03-25|Gec Alsthom Sa|DEVICE FOR MEASURING THE ANGULAR POSITION AND THE LINEAR DISPLACEMENT OF TWO WORKPIECES IN RELATION TO ONE ANOTHER|
    DE19738836A1|1997-09-05|1999-03-11|Hella Kg Hueck & Co|Inductive angle sensor|
    PL341708A1|1997-11-28|2001-04-23|Asea Brown Boveri|Method of and apparatus for controlling magnetic flux in a high-voltage rotary ac electric machine with a permanent-magnet rotor|
    DE19920190A1|1999-05-03|2000-11-09|Hella Kg Hueck & Co|Inductive linear sensor and inductive angle sensor|
    US6304076B1|1999-09-07|2001-10-16|Bei Sensors & Systems Company, Inc.|Angular position sensor with inductive attenuating coupler|
    DE10026019B4|2000-05-25|2015-03-05|Hella Kgaa Hueck & Co.|Inductive position sensor, in particular for a motor vehicle|
    DE10121870B4|2001-05-05|2007-09-20|Hella Kgaa Hueck & Co.|Inductive planar built-up angle sensor|
    US7095193B2|2004-05-19|2006-08-22|Hr Textron, Inc.|Brushless DC motors with remote Hall sensing and methods of making the same|
    DE102006055409A1|2006-11-22|2008-05-29|Ab Elektronik Gmbh|Inductive sensor for the detection of two coupling elements|
    DE102007037217A1|2007-08-07|2009-02-12|Robert Bosch Gmbh|Measuring device for use in motor vehicle i.e. motorcycle, for contactless detection of relative rotary position between bodies, has coil pairs with coils arranged with respect to rotational axis in diametrically opposite manner|
    US7911354B2|2007-12-12|2011-03-22|Ksr Technologies Co.|Inductive position sensor|
    DE102008024527A1|2008-05-25|2009-11-26|Lenze Automation Gmbh|Method and device for monitoring a rotational angle sensor|
    JP5239025B2|2009-03-11|2013-07-17|株式会社ミツトヨ|Inductive detection type rotary encoder|
    US8729887B2|2009-11-09|2014-05-20|Aisan Kogyo Kabushiki Kaisha|Rotation angle sensor|
    DE102010003096A1|2010-03-22|2011-09-22|Robert Bosch Gmbh|Method and device for determining a current angular position of a rotatable magnetic component in an electric drive|
    DE102010029332A1|2010-05-27|2011-12-01|Robert Bosch Gmbh|Electric motor, steering device and method|
    DE102011085636A1|2011-11-02|2013-05-02|Hamilton Bonaduz Ag|Linear motor with multiple sensor units and modular stator construction|
    JP2014006175A|2012-06-26|2014-01-16|Aisan Ind Co Ltd|Angle sensor|
    JP2014025757A|2012-07-25|2014-02-06|Aisan Ind Co Ltd|Angle sensor and vehicle|
    US9052219B2|2012-11-06|2015-06-09|Continental Automotive Systems, Inc.|Inductive position sensor with field shaping elements|
    WO2015087381A1|2013-12-09|2015-06-18|三菱電機株式会社|Rotation angle detector, rotating electrical machine, and elevator hoist|
    DE102013225921A1|2013-12-13|2015-07-02|Continental Teves Ag & Co. Ohg|Inductive rotation angle and torque sensor with a position transducer unit equipped with oscillating circuits|
    JP6106077B2|2013-12-26|2017-03-29|アズビル株式会社|Rotation angle detector and actuator|
    JP6277047B2|2014-04-09|2018-02-07|株式会社ミツトヨ|Inductive detection type rotary encoder|
    JP6376987B2|2015-02-17|2018-08-22|三菱電機株式会社|Rotating electric machine|
    DE102015220650A1|2015-10-22|2017-04-27|Robert Bosch Gmbh|Rotation angle sensor|DE102018102094A1|2018-01-31|2019-08-01|Thyssenkrupp Ag|Inductive angle sensor for a motor vehicle steering|
    CN111022806B|2019-11-19|2021-05-04|江苏长龄液压股份有限公司|Central swivel joint with angle sensor|
    CN110986752B|2019-11-26|2021-05-18|深圳市智能机器人研究院|Angle self-correction method and system based on multi-frequency excitation|
    法律状态:
    2018-09-21| PLFP| Fee payment|Year of fee payment: 2 |
    2019-09-23| PLFP| Fee payment|Year of fee payment: 3 |
    2020-09-22| PLFP| Fee payment|Year of fee payment: 4 |
    2021-09-27| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102016217255.7|2016-09-09|
    DE102016217255.7A|DE102016217255A1|2016-09-09|2016-09-09|Angle of rotation sensor and stator for this|
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