WO2020073604A1 - 一种基于压阻式向心力测量的lc式转速传感器 - Google Patents

一种基于压阻式向心力测量的lc式转速传感器 Download PDF

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WO2020073604A1
WO2020073604A1 PCT/CN2019/078283 CN2019078283W WO2020073604A1 WO 2020073604 A1 WO2020073604 A1 WO 2020073604A1 CN 2019078283 W CN2019078283 W CN 2019078283W WO 2020073604 A1 WO2020073604 A1 WO 2020073604A1
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speed sensor
rotation speed
inductance coil
parasitic resistance
value
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French (fr)
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董蕾
黄庆安
王立峰
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Southeast University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds

Definitions

  • the invention relates to the field of sensor technology, in particular to an LC type rotational speed sensor technology based on piezoresistive centripetal force measurement.
  • Passive wireless sensors do not require power supply, and perform signal coupling through inductive coupling. Therefore, it has two natural advantages: first, it does not require electrical connection; second, it does not need to replace the battery, so it has theoretically unlimited life. It is precisely because of these two essential advantages that passive wireless sensors have unparalleled advantages in some special application environments, such as closed environments, mechanical rotating structures and so on.
  • the invention provides an LC-type rotational speed sensor based on piezoresistive centripetal force measurement.
  • the LC-type rotational speed sensor includes an inductance coil and a capacitor; the inductance coil includes an inductance and a parasitic resistance; the inductance coil is formed in series with the capacitance LC resonant circuit; the inductance coil is wound on the outer surface of the rotating part; the inductance coil is made of piezoresistive material, and the parasitic resistance value is determined by the magnitude of the pressure received by the piezoresistive material.
  • the rotation of the rotating member causes the change in the value of the parasitic resistance to be proportional to the square of the rotation speed, and the relationship is
  • G is the piezoresistive strain coefficient
  • s is the area under stress
  • E is the Young's modulus
  • the relationship between the parasitic resistance and the quality factor is
  • R is the value of the parasitic resistance
  • C is the capacitance
  • L is the inductance
  • Q is the quality factor
  • the corresponding rotation speed of the rotating component can be obtained.
  • the LC-type rotational speed sensor uses the parasitic capacitance of the inductance coil itself as the capacitance.
  • the LC type rotation speed sensor provided by the present invention changes the parasitic resistance value by the centrifugal force exerted on the inductance coil by the rotating component, thereby affecting the Q value of the LC resonance circuit.
  • the sensor structure is simple and the detection sensitivity is high.
  • Figure 1 is a structural schematic diagram of the present invention
  • the present invention provides an LC-type rotational speed sensor based on piezoresistive centripetal force measurement.
  • the LC-type rotational speed sensor includes an inductor 1 and a capacitor 2; an inductor coil 1 is wound on the outer surface of a rotating component.
  • the inductance coil 1 is made of a piezoresistive material.
  • the inductance coil 1 includes an inductance 11 and a parasitic resistance 12, see FIG. 2 for details.
  • the size of the parasitic resistance 12 is determined by the amount of pressure received by the piezoresistive material; the inductor coil 1 and the capacitor 2 are connected in series to form an LC resonant circuit.
  • the induction coil 1 is subjected to the centrifugal force F, and the magnitude of the centrifugal force F is
  • G is the piezoresistive strain coefficient
  • s is the area under stress
  • E is the Young's modulus
  • the parasitic resistance 12 changes, causing the quality factor Q value of the LC series resonant circuit to change.
  • the relationship between each quality factor Q and different speeds w is established.
  • the quality factor Q needs to be monitored and compared with the calibration value to obtain the change in the speed to be measured.
  • the inductor coil When the rotating part rotates at the speed w, the inductor coil will be subjected to a centrifugal force, and the centrifugal force is proportional to the speed w 2 .
  • the resistance value of the parasitic resistance changes.
  • the Q value of the sensor is inversely proportional to the resistance.
  • the Q value also changes accordingly.
  • the corresponding speed can be obtained.
  • the LC-type rotational speed sensor of the present invention changes the parasitic resistance value by the centrifugal force exerted on the inductor coil by the rotating component, thereby affecting the Q value of the LC resonant circuit.
  • the sensor structure is simple and the detection sensitivity is high.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

一种基于压阻式向心力测量的LC式转速传感器，包括电感线圈（1）和电容（2）；电感线圈（1）包括电感（11）和寄生电阻（12），电感线圈（1）与电容（2）串联形成LC谐振回路；电感线圈（1）缠绕在旋转部件的外表面上；电感线圈（1）由压阻材料制成，寄生电阻值由压阻材料受到的压力大小决定。

Description

一种基于压阻式向心力测量的LC式转速传感器 技术领域
本发明涉及属于传感器技术领域，特别涉及一种基于压阻式向心力测量的LC式转速传感器技术。
背景技术
无源无线传感器不需要电源供电，通过电感耦合的方式进行信号耦合。因此其具备两个天然优势：一是不需要电气连接；二是不需要更换电池，从而理论上具有无限寿命。正是由于这两点本质上的优势，使得无源无线传感器在某些特殊的应用环境下具有无可比拟的优势，比如密闭环境、机械旋转结构等等。
已有的实现转速测量的传感器利用测速编码器实现。在工作时，测速编码器输出脉冲，计数器收到脉冲。根据转速的不同，在单位时间内收到的脉冲总量不同。通过后续的解码与信号处理，得出转速情况。其分辨率依赖于编码分辨率以及数据处理时的插值单元。目前采用的编码器体积较大，一般需要外加电源供电，成本较高，且无法适应恶劣的工业环境。
发明内容
本发明提供了一种基于压阻式向心力测量的LC式转速传感器，所述LC式转速传感器包括电感线圈和电容；所述电感线圈包括电感和寄生电阻；所述电感线圈与所述电容串联形成LC谐振回路；所述电感线圈缠绕在旋转部件的外表面上；所述电感线圈由压阻材料制成，所述寄生电阻值由压阻材料受到的压力大小决定。
优选地，在旋转部件的旋转运动中，所述电感线圈1受到离心力的作用，所述电感线圈受到的离心力与转速的平方呈线性关系，关系式为F＝4π 2mw 2r，其中，F为离心力，w为转速，r为旋转部件的旋转半径。
优选地，所述旋转部件旋转，引起所述寄生电阻的值的变化与转速的平方成正比，关系式为
Figure PCTCN2019078283-appb-000001
其中G为压阻应变系数，s为受力面积，E为杨氏模量。
优选地，所述寄生电阻和品质因数的关系式为
Figure PCTCN2019078283-appb-000002
其中，R为寄生电阻的值，C为电容，L为电感，Q为品质因数。
优选地，通过测量所述LC传感器的Q值，就可以得到所述旋转部件的对应的转速。
优选地，所述LC式转速传感器使用电感线圈自身的寄生电容作为电容。
有益效果：
本发明提供的LC式转速传感器，通过旋转部件施加在电感线圈上的离心力使得寄生电阻值发生变化，从而影响LC谐振回路的Q值，传感器结构简单，探测灵敏度高。
附图说明
图1为本发明的结构原理图；
图2为本发明的等效电路图。
具体实施方式
下面通过具体实施方式结合附图对本发明作进一步详细说明。本发明可以以多种不同的形式来实现，并不限于本实施例所描述的实施方式。提供以下具体实施方式的目的是便于对本发明公开内容更清楚透彻的理解，其中上、下、左、右等指示方位的字词仅是针对所示结构在对应附图中位置而言。
如图1所示，本发明提供了一种基于压阻式向心力测量的LC式转速传感器，该LC式转速传感器包括电感1和电容2；电感线圈1缠绕在旋转部件的外表面上。电感线圈1由压阻材料制成，该电感线圈1包括电感11和寄生电阻12，具体参见图2。寄生电阻12大小由压阻材料受到的压力大小决定；电感线圈1与电容2串联形成LC谐振回路。在旋转部件的旋转运动中，电感线圈1受到离心力F的作用，离心力F大小为
F＝4π 2mw 2r   (1)
其中m为旋转部件的质量，w为转速，r为旋转部件的旋转半径。引起电阻的相对变化为
Figure PCTCN2019078283-appb-000003
其中G为压阻应变系数，s为受力面积，E为杨氏模量。由此可见，电阻值的变化与转速的平方成正比，即转速的变化将以平方的形式传递到电阻的变化中，因此转速传感器的灵敏度较高。
寄生电阻12发生变化，导致LC串联谐振回路的品质因数Q值发生变化。在实际测量时，建立各个品质因数Q与不同转速w之间的关系，当传感器工作时，只需对各个品质因数Q进行监测，与标定值进行对比，即可得到待测转速的变化。
当旋转部件以转速w旋转时，电感线圈会受到一个离心力，并且离心力正比于转速w 2。此时，寄生电阻的电阻值发生变化。根据公式
Figure PCTCN2019078283-appb-000004
可知，传感器的Q值与电阻大小呈反比关系。当寄生电阻的阻值变化时，Q值也产生相应变化。此时通过测量LC传感器的Q 值，就可以得到对应的转速。
与现有技术相比，本发明的LC式转速传感器，通过旋转部件施加在电感线圈上的离心力使得寄生电阻值发生变化，从而影响LC谐振回路的Q值，传感器结构简单，探测灵敏度高。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (6)

  1. 一种基于压阻式向心力测量的LC式转速传感器，其特征在于，所述LC式转速传感器包括电感线圈和电容；所述电感线圈包括电感和寄生电阻；所述电感线圈与所述电容串联形成LC谐振回路；所述电感线圈缠绕在旋转部件的外表面上；所述电感线圈由压阻材料制成，所述寄生电阻值由压阻材料受到的压力大小决定。
  2. 根据权利要求1所述的LC式转速传感器，其特征在于，在旋转部件的旋转运动中，所述电感线圈受到离心力的作用，所述电感线圈受到的离心力与转速的平方呈线性关系，关系式为F＝4π 2mw 2r，其中，F为离心力，w为转速，r为旋转部件的旋转半径。
  3. 根据权利要求1所述的LC式转速传感器，其特征在于，所述旋转部件旋转，引起所述寄生电阻的值的变化与转速的平方成正比，关系式为
    Figure PCTCN2019078283-appb-100001
    其中G为压阻应变系数，s为受力面积，E为杨氏模量。
  4. 根据权利要求3所述的LC式转速传感器，其特征在于，所述寄生电阻和品质因数的关系式为
    Figure PCTCN2019078283-appb-100002
    其中，R为寄生电阻的值，C为电容，L为电感，Q为品质因数。
  5. 根据权利要求4所述的LC式转速传感器，其特征在于，通过测量所述LC传感器的Q值，就可以得到所述旋转部件的对应的转速。
  6. 根据权利要求1所述的LC式转速传感器，其特征在于，所述LC式转速传感器使用电感线圈自身的寄生电容作为电容。
PCT/CN2019/078283 2018-10-11 2019-03-15 一种基于压阻式向心力测量的lc式转速传感器 Ceased WO2020073604A1 (zh)

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