A method for indicating the gap of a circular displacement sensor and a circular displacement sensor.

Abstract

This invention discloses a gap indication method for a circular displacement sensor and a circular displacement sensor. The gap indication method uses a circular displacement sensor including a stator and a rotor coaxially arranged with the stator. The gap value d between the rotor and the stator is determined based on the signal amplitude transmitted from the rotor to the stator, and different operating states are indicated based on the magnitude of this gap value d. This invention can indicate the size of the gap between the rotor and the stator, thereby improving the displacement detection accuracy and stability of the circular displacement sensor.

Description

Technical Field

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[0009]

[0001] The present invention relates to the technical field of sensors, and particularly relates to a gap indication method for a circular displacement sensor and a circular displacement sensor. Background Art

[0002] A displacement sensor is an instrument that converts a displacement amount into an electric quantity to detect the displacement amount. A circular displacement sensor is a commonly used displacement sensor. The circular displacement sensor includes a coaxially arranged stator and rotor. When performing displacement detection, an excitation signal is applied to the stator, and the stator radiates the excitation signal to the rotor. The rotor outputs a sensor signal with displacement information under the action of the excitation signal and transmits it to the stator. By analyzing and processing this signal, the displacement information is resolved, and thus the basic function of the circular displacement sensor is achieved.

[0003] During the actual use of the circular displacement sensor, there is a certain gap between the rotor and the stator. The size of this gap will affect the signal transmission effect between the rotor and the stator. If the gap is too small, the signal will be too strong and the sensor will work abnormally. If the gap is too large, the signal will be too weak and the sensor will not work properly, thus affecting the accuracy and stability of the sensor's displacement detection. Summary of the Invention

[0004] Aiming at the above deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a gap indication method for a circular displacement sensor and a circular displacement sensor that can indicate the size of the gap between the rotor and the stator to improve the displacement detection accuracy and stability of the circular displacement sensor.

[0005] To solve the above technical problem, the present invention adopts the following technical solutions:

[0006] A gap indication method for a circular displacement sensor. The circular displacement sensor adopted by this gap indication method includes a stator and a rotor coaxially arranged with the stator. The gap value d between the rotor and the stator is determined according to the signal amplitude transmitted from the rotor to the stator, and different working states are indicated according to the size of the gap value d.

[0007] Preferably, the gap between the stator and the rotor is divided into multiple interval segments, and different working states are indicated when the gap value d determined according to the signal amplitude transmitted from the rotor to the stator is in different interval segments.

[0008] Preferably, when the gap value d between the stator and the rotor < d0, it is indicated that the gap between the stator and the rotor is too small, the signal is too strong, and the working state of the circular displacement sensor is abnormal;

[0009] When the clearance value d0 ≤ d < d1 between the stator and the rotor indicates that the clearance between the stator and the rotor is small, the signal is strong, the circular displacement sensor is in normal working condition, and the clearance between the stator and the rotor can be increased;

[0010] When the clearance value d1 ≤ d < d2 between the stator and the rotor indicates that the clearance between the stator and the rotor is normal, the signal is moderate, and the circular displacement sensor is in the best working state;

[0011] When the clearance value d2 ≤ d ≤ d3 between the stator and the rotor indicates that the clearance between the stator and the rotor is large, the signal is weak, the circular displacement sensor is in normal working condition, and the clearance between the stator and the rotor can be decreased;

[0012] When the clearance value d > d3 between the stator and the rotor indicates that the clearance between the stator and the rotor is too large, the signal is too weak, and the circular displacement sensor cannot work properly.

[0013] Preferably, two light sources a and b of different colors are used to indicate different working states when the clearance value d is in different interval segments.

[0014] When the clearance value d < d0 between the stator and the rotor, light source a flashes quickly and light source b goes out;

[0015] When the clearance value d0 ≤ d < d1 between the stator and the rotor, light source a goes out and light source b flashes quickly;

[0016] When the clearance value d1 ≤ d < d2 between the stator and the rotor, light source a goes out and light source b is on constantly;

[0017] When the clearance value d2 ≤ d ≤ d3 between the stator and the rotor, light source a goes out and light source b flashes slowly;

[0018] When the clearance value d > d3 between the stator and the rotor, light source a flashes slowly and light source b goes out.

[0019] Preferably, the relationship between different amplitudes of the signal transmitted from the rotor to the stator and different clearances between the rotor and the stator is set to determine the clearance value d between the rotor and the stator according to the detected amplitude of the signal transmitted from the rotor to the stator.

[0020] A circular displacement sensor implementing the gap indication method of the above-mentioned circular displacement sensor, on the end face of the stator facing the rotor, there are excitation electrodes and induction electrodes, on the end face of the rotor facing the stator, there are displacement information electrodes and reflection electrodes, the excitation electrodes correspond to the displacement information electrodes, and the excitation electrodes can radiate excitation signals to the displacement information electrodes, the displacement information electrodes output sensor signals with displacement information to the reflection electrodes, the induction electrodes and the reflection electrodes correspond, and the reflection electrodes can transmit the sensor signals with displacement information to the induction electrodes;

[0021] On the end face of the stator facing away from the rotor, there are also an excitation unit, an induction unit and a signal processing unit, the excitation unit and the induction unit are both communicatively connected to the signal processing unit, the excitation unit is used to apply an excitation signal to the excitation electrodes, the induction unit is used to detect the signals on the induction electrodes in real time to obtain the analog signals transmitted from the rotor to the stator, and after processing this analog signal, convert it into a digital signal and send it to the signal processing unit, the signal processing unit is used to control the excitation unit to generate an excitation signal, and at the same time obtain the digital signal of the induction unit and analyze the amplitude of this digital signal to determine the gap value d between the stator and the rotor according to this amplitude.

[0022] Preferably, on the end face of the stator facing away from the rotor, there are also an indication unit and a signal output port, the indication unit and the signal output interface are both communicatively connected to the signal processing unit, the signal processing unit sends different indication control signals to the indication unit according to the size of the obtained gap value d, and sends the obtained gap value d to the signal output port to be sent to an external upper computer for display through the signal output port.

[0023] Preferably, the signal processing unit divides the gap between the stator and the rotor into multiple interval segments, when the gap value d obtained by the signal processing unit according to the amplitude of the digital signal is in different interval segments, the signal processing unit sends different indication control signals to the indication unit.

[0024] Preferably, the indication unit includes light source a and light source b;

[0025] When the gap value d between the stator and the rotor < d0, the signal processing unit sends an indication control signal of fast flashing of light source a and extinguishing of light source b to the indication unit;

[0026] When the gap value d0 ≤ d < d1 between the stator and the rotor, the signal processing unit sends an indication control signal of extinguishing of light source a and fast flashing of light source b to the indication unit;

[0027] When the clearance value d1 ≤ d < d2 between the stator and the rotor, the signal processing unit sends an indication control signal for turning off light source a and keeping light source b on to the indication unit;

[0028] When the clearance value d2 ≤ d ≤ d3 between the stator and the rotor, the signal processing unit sends an indication control signal for turning off light source a and flashing light source b slowly to the indication unit;

[0029] When the clearance value d > d3 between the stator and the rotor, the signal processing unit sends an indication control signal for flashing light source a and turning off light source b to the indication unit.

[0030] Preferably, light source a is an LED red light, and light source b is an LED green light.

[0031] Compared with the prior art, the present invention analyzes the amplitude of the signal transmitted from the rotor to the stator, determines the clearance value d between the stator and the rotor at the current moment according to the signal amplitude, and gives different indications when the clearance value d is different, so that the size of the clearance value d between the current rotor and the stator can be intuitively understood according to the indication result. When the clearance value d is too large or too small, resulting in the circular displacement sensor being unable to work properly or the signal strength being too large or too small, the clearance value d between the stator and the rotor can be adjusted to a range with appropriate signal. During the adjustment process, it can be directly judged whether the adjustment of the current clearance value d is in place through the indication result. In this way, the indication of the clearance value d between the rotor and the stator can be realized to ensure the signal strength for the operation of the circular displacement sensor, thereby improving the detection accuracy and stability of the circular displacement sensor. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of the circular displacement sensor of the present invention;

[0033] Figure 2 It is a schematic structural diagram of the upper surface of the rotor in the circular displacement sensor of the present invention;

[0034] Figure 3 It is a schematic structural diagram of the lower surface of the stator in the circular displacement sensor of the present invention;

[0035] Figure 4 It is a schematic structural diagram of the back surface of the stator in the circular displacement sensor of the present invention.

[0036] Description of the reference numerals: stator 1, rotor 2, displacement information electrode 3, reflection electrode 4, excitation electrode 5, induction electrode 6, excitation unit 7, signal processing unit 8, induction unit 9, indication unit 10, LED red light 11, LED green light 12, signal output port 13. Detailed Embodiments

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0038] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0039] A circular displacement sensor comprises a coaxially arranged stator and rotor. During displacement detection, an excitation signal is applied to the stator, which radiates the excitation signal to the rotor. Under the action of the excitation signal, the rotor outputs a sensor signal containing displacement information and transmits it to the stator. By analyzing and processing this signal, the displacement information is resolved, thus realizing the basic function of the circular displacement sensor. In actual use, a certain gap exists between the rotor and stator, and the size of this gap affects the signal transmission efficiency between them.

[0040] Therefore, this solution provides a gap indication method for a circular displacement sensor, wherein the circular displacement sensor used in this gap indication method is as shown in the attached figure. Figure 1 To the attached Figure 4 As shown, the system includes a stator 1 and a rotor 2 coaxially mounted with the stator 1. The gap value d between the rotor 2 and the stator 1 is determined based on the signal amplitude transmitted from the rotor 2 to the stator 1, and different operating states are indicated based on the magnitude of this gap value d. When the gap value d between the rotor 2 and the stator 1 is different, the signal amplitude transmitted from the rotor 2 to the stator 1 is also different, so the gap value d between the stator 1 and the rotor 2 can be determined based on this signal amplitude.

[0041] In this embodiment, the gap between the stator 1 and the rotor 2 is divided into multiple interval segments, and different working states are indicated when the gap value d determined according to the signal amplitude transmitted from the rotor 2 to the stator 1 is located in different interval segments.

[0042] In this embodiment, when the gap value d between the stator 1 and the rotor 2 is less than d0, it is indicated that the gap between the stator 1 and the rotor 2 is too small, the signal is too strong, and the working state of the circular displacement sensor is abnormal;

[0043] When the gap value d0 ≤ d < d1 between the stator 1 and the rotor 2, it is indicated that the gap between the stator 1 and the rotor 2 is small, the signal is strong, the working state of the circular displacement sensor is normal, and the gap between the stator 1 and the rotor 2 can be increased;

[0044] When the gap value d1 ≤ d < d2 between the stator 1 and the rotor 2, it is indicated that the gap between the stator 1 and the rotor 2 is normal, the signal is moderate, the signal quality is the best, and the circular displacement sensor is in the best working state;

[0045] When the gap value d2 ≤ d ≤ d3 between the stator 1 and the rotor 2, it is indicated that the gap between the stator 1 and the rotor 2 is large, the signal is weak, the working state of the circular displacement sensor is normal, and the gap between the stator 1 and the rotor 2 can be reduced;

[0046] When the gap value d between the stator 1 and the rotor 2 is greater than d3, it is indicated that the gap between the stator 1 and the rotor 2 is too large, the signal is too weak, and the circular displacement sensor cannot work properly. Specifically, the specific values of d0, d1, d2, and d3 can be specifically set according to the conditions of different circular displacement sensors.

[0047] In this application, it is defined that when the gap value between the stator 1 and the rotor 2 is within the range of d1 ≤ d < d2, it is the standard gap. At this time, the gap between the stator 1 and the rotor 2 is normal, the signal is moderate, and the circular displacement sensor is in the best working state. When the gap value is within the range of d0 ≤ d < d1, the gap between the stator 1 and the rotor 2 is relatively small (here, the relatively small gap is in comparison with the defined standard gap, and the specific difference between the two is determined according to the selected values of d0, d1, and d2). The signal is stronger than that in the standard gap. The circular displacement sensor can still work normally within this gap range, and at this time, the gap between the stator 1 and the rotor 2 can be increased to reach the standard gap. When the gap value continues to decrease such that d < d0, the gap between the stator 1 and the rotor 2 is too small (here, the too small gap is also in comparison with the defined standard gap, and the specific difference between the two is determined according to the selected values of d0, d1, and d2). The signal is too strong compared to the standard gap, and the circular displacement sensor has an abnormal working state within this gap range. When the gap value is within the range of d2 ≤ d ≤ d3, the gap between the stator 1 and the rotor 2 is relatively large (here, the relatively large gap is in comparison with the defined standard gap, and the specific difference between the two is determined according to the selected values of d1, d2, and d3). The signal is weaker than that in the standard gap. The circular displacement sensor can still work normally within this gap range, and at this time, the gap between the stator 1 and the rotor 2 can be decreased to reach the standard gap. When the gap value continues to increase such that d > d3, the gap between the stator 1 and the rotor 2 is too large (here, the too large gap is also in comparison with the defined standard gap, and the specific difference between the two is determined according to the selected values of d1, d2, and d3). The signal is too weak compared to the standard gap, and the circular displacement sensor cannot work normally within this gap range.

[0048] In this embodiment, two light sources a and b with different colors are used to indicate the states when the gap value d is in different interval segments. In specific use, other recognizable methods can also be adopted, such as indicating with different sounds, etc.

[0049] When the gap value d between the stator 1 and the rotor 2 is less than d0, the light source a flashes rapidly and the light source b goes out.

[0050] When the gap value d between the stator 1 and the rotor 2 is within the range of d0 ≤ d < d1, the light source a goes out and the light source b flashes rapidly.

[0051] When the gap value d between the stator 1 and the rotor 2 is within the range of d1 ≤ d < d2, the light source a goes out and the light source b is constantly on.

[0052] When the gap value d between the stator 1 and the rotor 2 is within the range of d2 ≤ d ≤ d3, the light source a goes out and the light source b flashes slowly.

[0053] When the gap value d between the stator 1 and the rotor 2 is greater than d3, the light source a flashes slowly and the light source b goes out.

[0054] In this embodiment, a relationship is established between different amplitudes of the signal transmitted from the rotor 2 to the stator 1 and different gaps between the rotor 2 and the stator 1, so as to determine the gap value d between the rotor 2 and the stator 1 based on the detected amplitude of the signal transmitted from the rotor 2 to the stator 1.

[0055] In addition, this solution also provides a circular displacement sensor that realizes the gap indication method of the above-mentioned circular displacement sensor. The end face of the stator 1 facing the rotor 2 (i.e., the lower surface of the stator) is provided with an excitation electrode 5 and a sensing electrode 6. The excitation electrode 5 includes a plurality of excitation electrode plates evenly distributed along the circumference. The sensing electrode 6 is also distributed in a circle along the circumference on the stator 1, and the sensing electrode 6 is located inside the excitation electrode 5. The end face of the rotor 2 facing the stator 1 (i.e., the upper surface of the rotor) is provided with a displacement information electrode 3 and a reflection electrode 4. The displacement information electrode 3 includes a plurality of displacement information electrode plates evenly distributed along the circumference. The reflection electrode 4 is distributed in a circle along the circumference on the rotor 2, and the reflection electrode 4 is located inside the displacement information electrode 3. The excitation electrode 5 corresponds to the displacement information electrode 3, and the excitation electrode 5 can radiate the excitation signal to the displacement information electrode 3. The displacement information electrode 3 outputs a sensor signal with displacement information to the reflection electrode 4. The sensing electrode 6 corresponds to the reflection electrode 4, and the reflection electrode 4 can transmit the sensor signal with displacement information to the sensing electrode 6.

[0056] The stator 1 is also provided with an excitation unit 7, an induction unit 9, and a signal processing unit 8 on the end face of the stator 1 facing away from the rotor 2 (i.e., the back side of the stator). The lower surface of the stator 1 and the back side of the stator 1 are in a multi-layer structure, which can be integrated into a multi-layer PCB board or a composite of multiple structures. The excitation unit 7 and the induction unit 9 on the back side of the stator 1 are both communicatively connected to the signal processing unit 8. The excitation unit 7 is used to apply an excitation signal to the excitation electrode 5. The induction unit 9 is used to detect the signal on the induction electrode 6 in real time to obtain the analog signal transmitted from the rotor 2 to the stator 1, and to process the analog signal and convert it into a digital signal and send it to the signal processing unit 8. The signal processing unit 8 is used to control the excitation unit 7 to generate an excitation signal, and at the same time to obtain the digital signal of the induction unit 9 and analyze the amplitude of the digital signal to determine the gap value d between the stator 1 and the rotor 2 based on the amplitude.

[0057] When the circular displacement sensor of the present invention is working, the signal processing unit 8 first controls the excitation unit 7 to generate an excitation signal; the excitation signal generated by the excitation unit 7 is applied to the excitation electrode 5 of the stator 1, and the excitation electrode 5 radiates the excitation signal to the displacement information electrode 3 of the rotor 2. The displacement signal electrode contains displacement information, and the sensor signal with displacement information is output under the excitation of the excitation signal. The sensor signal with displacement information is further transmitted to the induction electrode 6 of the stator 1 through the reflection electrode 4 of the rotor 2. The amplitude of the signal received by the induction electrode 6 changes with the change of the gap between the stator 1 and the rotor 2; the induction unit 9 on the stator 1 detects and processes the signal on the induction electrode 6 in real time. The signal received by the induction unit 9 is an analog signal transmitted from the rotor 2 to the stator 1, and this analog signal is an analog signal with displacement information. The induction unit 9 amplifies, filters, denoises, etc. this analog signal, and at the same time, after being processed by the induction unit 9, it becomes a digital signal that can be processed by the signal processing unit 8. The signal processing unit 8 processes this digital signal to realize the analysis of displacement information and realize the basic function of the circular displacement sensor.

[0058] In this embodiment, an indicating unit 10 and a signal output port 13 are further provided on the end face of the stator 1 facing away from the rotor 2. The indicating unit 10 and the signal output interface are both communicatively connected to the signal processing unit 8. The signal processing unit 8 sends different indication control signals to the indicating unit 10 according to the magnitude of the obtained gap value d, and sends the obtained gap value d to the signal output port 13 to be sent to an external host computer for display through the signal output port 13.

[0059] In this embodiment, the signal processing unit 8 divides the gap between the stator 1 and the rotor 2 into multiple interval segments. When the gap value d obtained by the signal processing unit 8 according to the amplitude of the digital signal is in different interval segments, the signal processing unit 8 sends different indication control signals to the indicating unit 10.

[0060] In this embodiment, the indicating unit 10 includes a light source a and a light source b;

[0061] When the gap value d between the stator 1 and the rotor 2 is less than d0, the signal processing unit 8 sends an indication control signal for the light source a to flash quickly and the light source b to go out to the indicating unit 10;

[0062] When the gap value d between the stator 1 and the rotor 2 satisfies d0 ≤ d < d1, the signal processing unit 8 sends an indication control signal for the light source a to go out and the light source b to flash quickly to the indicating unit 10;

[0063] When the gap value d between the stator 1 and the rotor 2 satisfies d1 ≤ d < d2, the signal processing unit 8 sends an indication control signal for the light source a to go out and the light source b to be constantly on to the indicating unit 10;

[0064] When the gap value between stator 1 and rotor 2 is d2≤d≤d3, the signal processing unit 8 sends an indication control signal to the indication unit 10 to indicate that the light source a is turned off and the light source b is flashing slowly.

[0065] When the gap value d between stator 1 and rotor 2 is greater than d3, the signal processing unit 8 sends an indication control signal to the indication unit 10 to indicate that the light source a flashes slowly and the light source b is turned off.

[0066] In this embodiment, light source a is LED red light 11, and light source b is LED green light 12.

[0067] Compared with existing technologies, this invention analyzes the signal amplitude transmitted from rotor 2 to stator 1, determines the current gap value d between stator 1 and rotor 2 based on the signal amplitude, and provides different indications when the gap value d is different. This allows technicians to intuitively understand the current gap value d between rotor 2 and stator 1 based on the indication results. When the gap value d is too large or too small, causing the circular displacement sensor to malfunction or the signal strength to be too high or too low, the gap value d between stator 1 and rotor 2 can be adjusted to a suitable signal range. During the adjustment process, technicians can directly judge whether the current gap value d has been adjusted properly based on the indication results. This enables the indication of the gap value d between rotor 2 and stator 1, ensuring the signal strength of the circular displacement sensor and thus improving the detection accuracy and stability of the circular displacement sensor.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A method for indicating the gap of a circular displacement sensor, wherein the circular displacement sensor used in the method includes a stator and a rotor coaxially disposed with the stator, characterized in that, Determine the gap value d between the rotor and the stator according to the signal amplitude transmitted from the rotor to the stator, and indicate different working states according to the magnitude of the gap value d; The end face of the stator facing the rotor is provided with excitation electrodes and induction electrodes, and the end face of the rotor facing the stator is provided with displacement information electrodes and reflection electrodes. The excitation electrodes correspond to the displacement information electrodes, and the excitation electrodes can radiate excitation signals to the displacement information electrodes. The displacement information electrodes output sensor signals with displacement information to the reflection electrodes. The induction electrodes correspond to the reflection electrodes, and the reflection electrodes can transmit the sensor signals with displacement information to the induction electrodes; The end face of the stator facing away from the rotor is further provided with an excitation unit, an induction unit and a signal processing unit. The excitation unit and the induction unit are both communicatively connected to the signal processing unit. The excitation unit is used to apply an excitation signal to the excitation electrodes. The induction unit is used to detect the signals on the induction electrodes in real time to obtain the analog signal transmitted from the rotor to the stator, and convert the analog signal into a digital signal after processing and send it to the signal processing unit. The signal processing unit is used to control the excitation unit to generate an excitation signal, and at the same time obtain the digital signal of the induction unit and analyze the amplitude of the digital signal to determine the gap value d between the stator and the rotor according to the amplitude; The end face of the stator facing away from the rotor is further provided with an indication unit and a signal output port. The indication unit and the signal output port are both communicatively connected to the signal processing unit. The signal processing unit sends different indication control signals to the indication unit according to the magnitude of the obtained gap value d, and sends the obtained gap value d to the signal output port to be sent to an external host computer through the signal output port for indication; The signal processing unit divides the gap between the stator and the rotor into multiple interval segments. When the gap value d obtained by the signal processing unit according to the amplitude of the digital signal is in different interval segments, the signal processing unit sends different indication control signals to the indication unit.

2. The gap indication method for a circular displacement sensor according to claim 1, characterized in that, When the gap value d between the stator and the rotor is less than d0, it indicates that the working state of the circular displacement sensor is abnormal; When the gap value d between the stator and the rotor satisfies d0 ≤ d < d1, it indicates that the working state of the circular displacement sensor is normal, and the gap between the stator and the rotor is increased; When the gap value d between the stator and the rotor satisfies d1 ≤ d < d2, it indicates that the circular displacement sensor is in the best working state; When the gap value d between the stator and the rotor satisfies d2 ≤ d ≤ d3, it indicates that the working state of the circular displacement sensor is normal, and the gap between the stator and the rotor is decreased; When the gap value d between the stator and the rotor is greater than d3, it indicates that the circular displacement sensor cannot work properly.

3. The gap indication method for a circular displacement sensor according to claim 2, characterized in that, Two light sources a and b with different colors are used to indicate different working states when the gap value d is in different interval segments, When the clearance value d between the stator and the rotor is less than d0, the light source a flashes quickly and the light source b goes out; When the clearance value d0 ≤ d < d1 between the stator and the rotor, the light source a goes out and the light source b flashes quickly; When the clearance value d1 ≤ d < d2 between the stator and the rotor, the light source a goes out and the light source b is constantly on; When the clearance value d2 ≤ d ≤ d3 between the stator and the rotor, the light source a goes out and the light source b flashes slowly; When the clearance value d between the stator and the rotor is greater than d3, the light source a flashes slowly and the light source b goes out.

4. The gap indication method for a circular displacement sensor according to claim 1, characterized in that, Set the relationship between different amplitudes of the signal transmitted from the rotor to the stator and different clearances between the rotor and the stator, so as to determine the clearance value d between the rotor and the stator according to the detected amplitude of the signal transmitted from the rotor to the stator.

5. A circular displacement sensor, comprising a stator and a rotor coaxially disposed with respect to the stator, characterized in that, The end face of the stator facing the rotor is provided with an excitation electrode and an induction electrode, the end face of the rotor facing the stator is provided with a displacement information electrode and a reflection electrode, the excitation electrode corresponds to the displacement information electrode, and the excitation electrode can radiate an excitation signal to the displacement information electrode, the displacement information electrode outputs a sensor signal with displacement information to the reflection electrode, the induction electrode corresponds to the reflection electrode, and the reflection electrode can transmit the sensor signal with displacement information to the induction electrode; The end face of the stator facing away from the rotor is further provided with an excitation unit, an induction unit and a signal processing unit. The excitation unit and the induction unit are both communicatively connected to the signal processing unit. The excitation unit is used to apply an excitation signal to the excitation electrode. The induction unit is used to detect the signal on the induction electrode in real time to obtain the analog signal transmitted from the rotor to the stator, and convert the analog signal into a digital signal after processing and send it to the signal processing unit. The signal processing unit is used to control the excitation unit to generate an excitation signal, and at the same time obtain the digital signal of the induction unit and analyze the amplitude of the digital signal to determine the clearance value d between the stator and the rotor according to the amplitude; The end face of the stator facing away from the rotor is further provided with an indication unit and a signal output port. The indication unit and the signal output port are both communicatively connected to the signal processing unit. The signal processing unit sends different indication control signals to the indication unit according to the size of the obtained clearance value d, and sends the obtained clearance value d to the signal output port to be sent to an external host computer for indication through the signal output port; The signal processing unit divides the clearance between the stator and the rotor into multiple interval segments. When the clearance value d obtained by the signal processing unit according to the amplitude of the digital signal is in different interval segments, the signal processing unit sends different indication control signals to the indication unit.

6. The circular displacement sensor according to claim 5, characterized in that, The indication unit includes a light source a and a light source b; When the clearance value d between the stator and the rotor is less than d0, the signal processing unit sends an indication control signal for the light source a to flash quickly and the light source b to go out to the indication unit; When the clearance value d between the stator and the rotor satisfies d0 ≤ d < d1, the signal processing unit sends an indication control signal for turning off light source a and flashing light source b quickly to the indication unit; When the clearance value d between the stator and the rotor satisfies d1 ≤ d < d2, the signal processing unit sends an indication control signal for turning off light source a and keeping light source b on constantly to the indication unit; When the clearance value d between the stator and the rotor satisfies d2 ≤ d ≤ d3, the signal processing unit sends an indication control signal for turning off light source a and flashing light source b slowly to the indication unit; When the clearance value d between the stator and the rotor satisfies d > d3, the signal processing unit sends an indication control signal for flashing light source a slowly and turning off light source b to the indication unit.

7. The circular displacement sensor according to claim 6, characterized in that, Light source a is an LED red light, and light source b is an LED green light.

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