• 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 sensor assembly for use in a bearing comprising at least one bearing cage (10) configured to accommodate at least one rolling element of said bearing, the sensor assembly comprising a piloted oscillator circuit (12) comprising a receiver (12a), a function generator (12b) and a primary coil (12c), and a passive oscillator circuit (14) comprising a temperature dependent capacitance (14a), said passive oscillator circuit (14) being configured to be fixed said rolling cage (10) such that the induction coil (14b) interacts with the primary coil (12c) of the controlled oscillator circuit (12). It is proposed that a directional coupler (1 2e) is set up in a signal line between a function generator (12b) and the primary coil (12c) of the system, the directional coupler (12e) being arranged to supplying a reflected signal from the passive resonant circuit in the cage to a tuned receiver (12a) receiving feedback from the signals generated by the function generator (12b).
    公开号:FR3039271A1
    申请号:FR1656830
    申请日:2016-07-18
    公开日:2017-01-27
    发明作者:Defeng Lang；Wit Frank De
    申请人:SKF AB；
    IPC主号:
    专利说明:

    SENSOR ASSEMBLY FOR BEARING WITH WIRELESS TEMPERATURE SENSOR
    Field of the Invention The invention relates to a bearing comprising a wireless temperature sensor according to the preamble of claim 1.
    Context of the invention
    Providing bearings, such as ball bearings or roller bearings, with temperature sensors is known. To monitor the bearing, the heat generated at the interface of the balls / rollers and raceways is detected by a temperature sensor located as close as possible to this interface. This makes the bearing cage a desirable position for temperature measurement. However, a rolling cage is a rotating part and is not easily accessible, and the available space is small. Especially for smaller bearings, it is difficult to integrate batteries or a generator in the rolling cage.
    EP 1 849 013 B1 discloses a bearing with a cage equipped with a feed-receiving reel. An emitter for sending a signal indicative of the detected state of the bearing to another antenna disposed on the outer raceway is integrated in the cage. However, this solution is only feasible for larger bearings with a cage that can carry the electronics of the transmitter.
    Passive wireless temperature sensors for rolling cages have been proposed, eg. in the article "A Passive Wireless Sensor Temperature for Harsh Environment Applications", Sensors 2008, 7982-7995 by Ya Wang, Yi Jia, Qiushui Chen and Yanyun Wang. A passive oscillator circuit comprising a temperature dependent capacitance and an inductor is disposed on a cage such that the induction coil interacts with an emitter coil of a controlled oscillator circuit disposed on a non-rotating race of the bearing. The temperature dependence of the capacitance results in a temperature dependence of the resonance frequency of the resonant circuit in the cage, which can be measured. Similar systems have been explored by S. Scott et al of Purdue University, see eg. http://docs.lib.purdue.edu/nanopub/1089.
    The resonant circuit in the cage absorbs power from the primary circuit with a coil on the non-rotating ring so that the resonant frequency can be derived from an absorption peak in the scan. frequency. The method measures the missing energy at the oscillation frequency.
    Typically, a function generator inserts a sinusoidal waveform into a coaxial cable. At the location of the measurement, a T-splitter device separates the signal into a part going to the primary coil / transceiver coil and the part going to a receiver to perform the spectral analysis. The combination of the primary coil and the measurement coil in the cage absorbs a certain amount of energy at a certain frequency and this absorbed fraction is dependent on the temperature. The rest, whatever it is, is supposed to reach the receiver. This process uses flux coupling between coils as in a transformer. However, the process suffers from a low signal-to-noise ratio and microphony caused by inadequate impedance matching.
    In reality, only part of the feedback signal from the transmitter-receiver coil reaches the receiver's analysis circuit, while another part returns to the generator and leads to a low signal-to-noise ratio.
    The primary coil of the sensor is essentially a loop and therefore a balanced type of electrical system, while the standard coaxial cable is unbalanced. The inherent problem is the inadequacy of the impedance of the system that causes a microphony, i.e. dependence on external conditions such as vibrations or tolerances so that the output values vary widely. Microphony is mainly caused by a reflected current flowing in the outer casing of a cable, which can be influenced by contact or movement. This results in difficulties of calibration and reproducibility. SUMMARY OF THE INVENTION The object of the invention is to provide a bearing with integrated temperature detection in a passive resonant circuit having a better signal-to-noise ratio. It is furthermore an object of the invention to provide a rolling cage measurement platform that satisfies the applicable space and weight limitations while reliably transferring both energy and data. The invention relates to a sensor assembly for use in a rolling element bearing having at least one rolling cage and a plurality of rolling elements disposed in said cage. The cage is part of a sensor assembly according to the invention, comprising a piloted oscillator circuit comprising a receiver, a function generator and a primary coil, said rolling cage comprising a passive oscillator circuit comprising a temperature-dependent capacitance and a induction coil, said passive oscillator circuit being fixed to said cage such that the induction coil interacts with the primary coil of the controlled oscillator circuit. The invention proposes in particular to set up a directional coupler between a function generator and the primary coil of the system, the directional coupler being arranged to deliver a signal reflected from the passive resonant circuit in the cage to a tuned receiver receiving the reaction of the signals generated by the function generator. The receiver is used to detect the complex amplitude vector of the reflected signal. A sampling system performing an analog-to-digital conversion follows this receiver and can analyze the signal. Generally, but not necessarily, it takes an average over a period of time sufficient for the cage to describe at least one turn, thereby eliminating any repetitive distance component and facilitating the separation of amplitude. The invention is applicable to any type of bearing with a cage capable of housing a passive circuit as defined above. It would be possible to use a metal cage itself as an induction coil or to embed the induction coil in a groove or other type of recess in a dielectric cage or simply to fix the coil to a coil. outer surface thereof.
    The controlled oscillator circuit may be attached to the non-rotating race of the bearing, to a bearing housing, or to any convenient location nearby. The primary coil is preferably attached to one of the rings of the bearing, preferably the outer ring of the bearing, e.g. by being attached to a seal or a bearing cap or integrated in the seal or cap so that a magnetic flux coupling between the primary coil and the induction coil is sufficiently strong.
    By having the transceiver pair scan a small frequency range in steps, frequency-amplitude pairs can be recorded. The oscillation frequency of the sensor circuit can be determined in such a way that the corresponding temperature in the position of the capacitance can be measured.
    The directional coupler prevents signal energy loss to the function generator and therefore leads to an increase in the signal-to-noise ratio. Basically, the directional coupler measures signal reflection rather than dissipation so that a better signal-to-noise ratio is obtained.
    In a preferred embodiment of the invention, the primary induction coil and the induction coil of the passive resonant circuit both extend over the entire circumference of the rolling stand. The flux can thus be maximized and a strong coupling between transmitting and receiving antennas and cage antennas can be obtained.
    According to a further aspect of the invention, it is proposed to further set up a transformer, preferably in the form of a current-mode balun, in a signal line comprising a coaxial cable between the directional coupler and the coil. primary. Due to the balun, the coaxial cable can be balanced and the microphony of the system can be reduced, i.e. that the system is much less sensitive to variations in conditions, vibrations, tolerances or the like.
    An analog-to-digital transformer can be used to digitize the signal and to allow the use of improved digital signal processing techniques.
    The above embodiments of the invention as well as the claims and accompanying figures show multiple features of the invention in specific combinations. Qualified persons will readily be able to contemplate additional combinations or sub-combinations of these features in order to adapt the invention as defined in the claims to their specific needs.
    Brief description of the figures
    Fig. 1 is a schematic circuit diagram of a sensor assembly according to the invention for use in a bearing; and FIG. 2 is a detail of a cage of the sensor assembly according to the invention.
    Detailed Description of the Embodiments
    Fig. 1 illustrates a sensor assembly comprising a controlled oscillator circuit 12 comprising a receiver 12a, a function generator 12b and a primary coil 12c. In addition, the sensor assembly comprises a passive oscillator circuit 14 comprising a temperature dependent capacitance 14a and an induction coil 14b. The passive oscillator circuit 14 is configured to be mounted in a rolling cage such that the induction coil 14b interacts with the primary coil 12c of the controlled oscillator circuit 12.
    The controlled oscillator circuit 12 may be attached to a non-rotating race of the bearing, to a bearing housing, or to any convenient location nearby. The primary coil 12c is preferably attached to one of the rolling rings, preferably the outer ring of the bearing, e.g. by being attached to a seal or a bearing cap or integrated into the seal or cap (not shown).
    According to the invention, a directional coupler 12e is set up in a signal line between a function generator 12b and the primary coil 12c of the system. The directional coupler 12e is arranged to deliver a reflected signal of the passive resonant circuit in the cage 10 to a tuned receiver 12a receiving the reaction of the signals generated by the function generator 12b.
    A transformer 12d configured as a current-mode balun is placed at the end of a signal line having a coaxial cable 12f between the directional coupler 12e and the primary coil 12c. Transformer 12d balances coaxial cable 12f so that the entire system, including coaxial cable 12f and primary coil 12c, becomes balanced.
    A signal processing unit 16 configured to analyze the signal received by the receiver 12a is set up and includes an analog-to-digital converter 16a receiving the output of the receiver 12a. The signal processing unit 16 is configured to calculate a signal average over a period of time sufficient for the cage 10 to describe at least one revolution with respect to a non-rotating ring, thereby eliminating any repetitive distance component. facilitating the separation of the amplitude. The signal processing unit 16 is used to detect the complex amplitude vector of the reflected signal and to analyze the signal.
    By having the receiver-function generating pair scan a small frequency range in steps, a set of frequency-amplitude pairs can be recorded. A peak in the oscillation frequency spectrum of the sensor circuit can be determined as the resonant frequency, such that the corresponding temperature of the cage is measured.
    Fig. 2 illustrates a detail of the bearing cage 10 equipped with the passive resonant circuit 14 according to the invention. The primary coil 12c and the inductive coil 14b of the passive resonant circuit both extend over the entire circumference of the rolling ring or the rolling stand and are arranged coaxially in the immediate vicinity of one of the 'other. The induction coil 14b is mounted in a notch 10a on an axial side surface of the roll cage. The same side surface includes a slightly larger recess 10b housing the capacitor 14b.
    The model according to the preferred embodiment of the invention uses a separate primary oscillator as a function generator 12b inserting its energy into a single winding of the primary coil 12c (or antenna) via the special system described above with the directional coupler 12e and transformer 12d (balun in current mode) as shown in FIG. 1.
    When a primary circuit is employed, the energy inserted into the primary coil 12c can either pass into the air or be reflected via the transformer 12d into the directional coupler 12e.
    One of the functions of the directional coupler 12e is to prevent as much as possible some of the reflected energy from returning to the function generating circuit and adding an additional output providing this reflected energy. This is then guided into the tuner 12a.
    Among the advantages, compared to the prior art, are better signal-to-noise ratio and reduced sensitivity to varying conditions, i.e. of the microphonie.
    权利要求:
    Claims (9)
    [1" id="c-fr-0001]
    claims
    A sensor assembly for use in a rolling element bearing comprising at least one bearing cage (10) configured to receive at least one rolling element of said bearing, the sensor assembly comprising a. a controlled oscillator circuit (12) comprising a receiver (12a), a function generator (12b) and a primary coil (12c), and b. a passive oscillator circuit (14) comprising a temperature dependent capacitance (14a), said passive oscillator circuit (14) being configured to be attached to said rolling cage (10) such that the induction coil (14b) interacting with the primary coil (12c) of the controlled oscillator circuit (12), characterized in that a directional coupler (12e) is set up in a signal line between a function generator (12b) and the primary coil (12c) ) of the system, the directional coupler (12e) being arranged to deliver a reflected signal from the passive resonant circuit in the cage to a tuned receiver (12a) receiving feedback from the signals generated by the function generator (12b).
    [2" id="c-fr-0002]
    2. Sensor assembly according to claim 1, characterized in that it further comprises a transformer (12d) in a signal line having a coaxial cable (12f) between the directional coupler (12e) and the primary coil (12c).
    [3" id="c-fr-0003]
    3. sensor assembly according to claim 2, characterized in that said transformer (12d) is configured as a balun current mode.
    [4" id="c-fr-0004]
    4. Sensor assembly according to one of the preceding claims, characterized in that it further comprises a signal processing unit (16) configured to analyze the signal received by the receiver (12a).
    [5" id="c-fr-0005]
    5. sensor assembly according to claim 4, characterized in that the signal processing unit (16) is configured to calculate a signal average over a period sufficient for the cage to describe at least one revolution with respect to a non-ferrous ring. rotating of the bearing.
    [6" id="c-fr-0006]
    6. Sensor assembly according to one of the preceding claims, characterized in that it further comprises an analog-digital converter (16a) receiving an output of said receiver (12a).
    [7" id="c-fr-0007]
    7. Sensor assembly according to one of the preceding claims, characterized in that the primary coil (12c) and the induction coil (14b) of the passive resonant circuit both extend over the entire circumference of the cage (10). rolling.
    [8" id="c-fr-0008]
    8. Bearing comprising a sensor assembly according to one of the preceding claims.
    [9" id="c-fr-0009]
    9. Machine comprising a bearing equipped with a sensor device according to one of claims 1 to 7.
    类似技术:
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    同族专利:
    公开号 | 公开日
    CN106369058B|2021-05-18|
    GB201512839D0|2015-09-02|
    US20170030804A1|2017-02-02|
    FR3039271B1|2019-05-24|
    GB2540565A|2017-01-25|
    US9964465B2|2018-05-08|
    CN106369058A|2017-02-01|
    GB2540565B|2019-04-24|
    DE102016213097A1|2017-01-26|
    引用文献:
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    法律状态:
    2017-07-27| PLFP| Fee payment|Year of fee payment: 2 |
    2018-04-06| PLSC| Search report ready|Effective date: 20180406 |
    2018-07-26| PLFP| Fee payment|Year of fee payment: 3 |
    2019-07-29| PLFP| Fee payment|Year of fee payment: 4 |
    2020-07-28| PLFP| Fee payment|Year of fee payment: 5 |
    2021-07-26| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    GB15128390|2015-07-21|
    GB1512839.0A|GB2540565B|2015-07-21|2015-07-21|Sensor assembly for bearing with wireless temperature sensor|
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