Torque measuring system

Abstract

The invention relates to the technical field of rotating shaft torque measuring systems, in particular to a torque measuring system. The device comprises a detection device and a detection module installed on the detection device. The detection device is provided with a fixed shell, and a connecting body is rotatably arranged in the fixed shell; the connecting body is used for realizing the connection between the power shaft and the load shaft, and the power shaft and the load shaft jointly form a rotating shaft to be detected; the detection module comprises an inner ring circuit unit arranged at the connecting body and an outer ring circuit unit arranged at the fixed shell, and the inner ring circuit unit and the outer ring circuit unit are independently arranged. When the measuring system is used, non-contact signal transmission between the dynamically rotating connecting body and the fixed shell can be well achieved, and the real-time performance and accuracy between the generated optical signal and the measured torque loading force are effectively guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of rotating shaft torque measurement systems, and in particular to a torque measurement system. Background Art

[0002] Torque is one of the important working parameters of power machinery. It is an important indicator parameter that reflects the on-site transmission working condition of power equipment. The measurement of torque signal value is of great practical significance for verifying the equipment working condition coefficient and the actual load of the machinery. For rotating shafts, studying the acquisition system for measuring the total torque caused by the actual load of the rotating shaft is an effective means to monitor the health status of equipment operation. Long-term monitoring can also provide data support for fault prediction and diagnosis.

[0003] At present, there are two methods to measure torque: mechanical measurement and electrical measurement. The mechanical method of measuring torque can only measure its stable average value, and cannot measure or record remote transmission and dynamic torque. As for electrical measurement, since the shaft to be detected is in a rotating state, on the one hand, the existing rotating shaft torque measurement system is difficult to install and has high cost in order to measure the rotating torque in real time; on the other hand, the real-time signal collected by the existing torque measurement system at the rotating shaft is difficult to be stably output in real time, resulting in the difficulty in ensuring the real-time and accuracy of the measurement results. Summary of the invention

[0004] The present invention provides a torque measurement system, which can overcome certain defects of the prior art.

[0005] A torque measurement system according to the present invention comprises a detection device and a detection module mounted on the detection device; the detection device has a fixed housing, and a connector is rotatably arranged in the fixed housing; the connector is used to realize the connection between the power shaft and the load shaft, and the power shaft and the load shaft together constitute a rotating shaft to be detected;

[0006] The detection module includes an inner ring circuit unit arranged at the connector and an outer ring circuit unit arranged at the fixed outer shell, and the inner ring circuit unit and the outer ring circuit unit are arranged independently of each other; the inner ring circuit unit is used to detect the torque load force at the detected shaft to generate an optical signal, and the outer ring circuit unit is used to detect the optical signal to generate a detection signal.

[0007] Specifically, when the measurement system in the present invention is in use, the power shaft as the driving part and the load shaft as the load part can be connected through the connecting body to form a connecting drive. Then, the inner ring circuit unit at the connecting body is arranged at the connecting body and rotates therewith, and during the rotation, it can measure the torque load force of the to-be-detected rotating shaft (power shaft and output shaft), and transmit it to the outer ring circuit unit fixed with the fixed housing through an optical signal; thus, it can preferably achieve non-contact signal transmission between the dynamically rotating connecting body and the fixed housing, and effectively ensure the real-time performance and accuracy between the generated optical signal and the measured torque load force.

[0008] The entire torque measurement system can operate stably when in use, and solves the problem of signal transmission during the rotation of the connecting body.

[0009] Preferably, the outer ring circuit unit has a DC-AC conversion circuit, and the inner ring circuit unit has a DC-AC conversion circuit; the DC-AC conversion circuit has a first coil, and the AC-DC conversion circuit has a second coil; the DC-AC conversion circuit is used to convert the first DC supply voltage accessed into a first AC supply voltage and couple it to the second coil through the first coil, and the AC-DC conversion circuit is used to convert the coupled voltage at the second coil into a second DC supply voltage for powering the inner ring circuit unit.

[0010] Preferably, the AC-DC conversion circuit includes a first terminal, a full-bridge rectifier circuit, and a first voltage stabilizing circuit connected in sequence. The first terminal is used to access the second coil, and the second DC supply voltage is +5V.

[0011] Preferably, the outer ring circuit unit has a first DC-DC conversion circuit, and the first DC-DC conversion circuit includes a second voltage stabilizing circuit. The second voltage stabilizing circuit is used to convert the first DC supply voltage into a third DC supply voltage of +12V, and the third DC supply voltage is used to power the outer ring circuit unit.

[0012] Preferably, the DC-AC conversion circuit includes an operational amplifier circuit and a MOS transistor. The operational amplifier circuit is used to generate a square-wave driving signal for driving the MOS transistor, and the MOS transistor is used to convert the first DC supply voltage into a first AC supply voltage and output it; the first DC supply voltage is +24V, and the effective value of the first AC supply voltage is about 20V.

[0013] Preferably, the inner ring circuit unit has a strain detection bridge circuit, a front-end amplifier circuit, a V / F conversion circuit, and an infrared emission circuit connected in sequence; the strain detection bridge circuit is used to detect the torque load force at the shaft to be detected, the front-end amplifier circuit is used to amplify the signal generated by the strain detection bridge circuit, the V / F conversion circuit is used to convert the electrical signal amplified by the front-end amplifier circuit into a frequency signal, and the infrared emission circuit is used to generate a flashing optical signal under the drive of the frequency signal.

[0014] Preferably, the infrared emission circuit includes an infrared diode drive circuit and a plurality of infrared diodes connected in parallel.

[0015] Preferably, the outer ring circuit unit has an infrared reception circuit and a frequency output circuit connected in sequence. The infrared reception circuit is used to detect the flashing optical signal generated by the infrared emission circuit and output it to the frequency output circuit. The frequency output circuit is used to process the signal sent by the infrared reception circuit to generate a detection signal, and the detection signal is a frequency signal.

[0016] Preferably, the detection signal is a frequency signal, and the detection signal is output through an external circuit.

[0017] Preferably, the external circuit includes an F / V conversion circuit, and the F / V conversion circuit is used to convert the detection signal into a voltage signal and output it. Description of the Drawings

[0018] Figure 1 It is a principle block diagram of the detection module in Embodiment 1.

[0019] Figure 2 It is a circuit schematic diagram of the AC-DC conversion circuit in the inner ring circuit unit.

[0020] Figure 3 It is a circuit schematic diagram of the first DC-DC conversion circuit and the DC-AC conversion circuit in the outer ring circuit unit.

[0021] Figure 4 It is a circuit schematic diagram of the front-end amplifier circuit in the inner ring circuit unit.

[0022] Figure 5 It is a circuit schematic diagram of the V / F conversion circuit and the infrared emission circuit in the inner ring circuit unit.

[0023] Figure 6 It is a circuit schematic diagram of the infrared reception circuit in the outer ring circuit unit.

[0024] Figure 7 It is a circuit schematic diagram of the frequency output circuit in the outer ring circuit unit.

[0025] Figure 8Schematic structural diagram of the device body in Embodiment 2;

[0026] Figure 9 is Figure 8 Schematic structural diagram of the removed fixed housing;

[0027] Figure 10 is Figure 9 Enlarged structural diagram at position A in

[0028] Figure 11 is Figure 9 Schematic structural diagram from another perspective;

[0029] Figure 12 Schematic structural diagram of the first end plate, the first mounting seat and the outer ring plate in Embodiment 2;

[0030] Figure 13 Schematic structural diagram of the main shaft, the second mounting seat, the inner ring plate and other structures in Embodiment 2;

[0031] Figure 14 Schematic structural diagram of the fixed housing in Embodiment 2;

[0032] Figure 15 Measurement results when the torque interval of the input torque is 2 in Embodiment 3;

[0033] Figure 16 Measurement results when the torque interval of the input torque is 5 in Embodiment 3. Detailed implementation manners

[0034] To further understand the content of the present invention, the present invention will be described in detail in combination with embodiments. It should be understood that the embodiments are only for explaining the present invention rather than limiting it.

[0035] Embodiment 1

[0036] Combined with Figures 1 - 7 , this embodiment provides a torque measurement system, which includes a detection device and a detection module installed on the detection device; the detection device has a fixed housing 520, and a connecting body 510 is rotatably arranged in the fixed housing 520; the connecting body 510 is used to realize the connection between the power shaft and the load shaft, and the power shaft and the load shaft together form the to-be-detected rotating shaft;

[0037] The detection module includes an inner ring circuit unit arranged at the connecting body 510 and an outer ring circuit unit arranged at the fixed housing 520, and the inner ring circuit unit and the outer ring circuit unit are independently arranged; the inner ring circuit unit is used to detect the torque load force at the to-be-detected rotating shaft to generate an optical signal, and the outer ring circuit unit is used to detect the optical signal to generate a detection signal.

[0038] Specifically, when the measurement system in this embodiment is in use, the power shaft serving as the driving part and the load shaft serving as the load part can be connected through the connecting body to form a connecting drive. Then, the inner ring circuit unit at the connecting body is arranged at the connecting body and rotates therewith, and during the rotation, it can measure the torque load force of the rotating shaft to be detected (power shaft and output shaft), and transmit it to the outer ring circuit unit fixed with the fixed housing through an optical signal; thus, it can preferably achieve non-contact signal transmission between the dynamically rotating connecting body and the fixed housing, and effectively ensure the real-time performance and accuracy between the generated optical signal and the measured torque load force.

[0039] The entire torque measurement system can operate stably when in use, and solves the problem of signal transmission during the rotation of the connecting body.

[0040] In this embodiment, the outer ring circuit unit has a DC-AC conversion circuit, and the inner ring circuit unit has a DC-AC conversion circuit; the DC-AC conversion circuit has a first coil 1110, and the AC-DC conversion circuit has a second coil 680; the DC-AC conversion circuit is used to convert the input first DC supply voltage into a first AC supply voltage and couple it to the second coil 680 through the first coil 1110, and the AC-DC conversion circuit is used to convert the coupled voltage at the second coil 680 into a second DC supply voltage for powering the inner ring circuit unit.

[0041] It can be understood that since the connecting body is in a rotating state, it is difficult for the inner ring circuit unit arranged at the connecting body to be directly connected to an external power supply, and the installation cost of a slip ring is relatively high; in this embodiment, through the fixed housing and the outer ring circuit unit that need to be set originally, in cooperation with the DC-AC conversion circuit and the DC-AC conversion circuit, the power supply problem of the inner ring circuit unit can be preferably solved.

[0042] In this embodiment, the AC-DC conversion circuit includes a first wiring terminal, a full-bridge rectifier circuit, and a first voltage stabilization circuit connected in sequence. The first wiring terminal is used to access the second coil 680, and the second DC supply voltage is +5V.

[0043] Specifically, in combination with Figure 2 , the AC-DC conversion circuit in this embodiment can stably convert the coupled voltage through the second coil into a second DC supply voltage.

[0044] In this embodiment, the outer ring circuit unit has a first DC-DC conversion circuit. The first DC-DC conversion circuit includes a second voltage stabilization circuit. The second voltage stabilization circuit is used to convert the first DC supply voltage into a third DC supply voltage of +12V, and the third DC supply voltage is used to power the outer ring circuit unit.

[0045] In this embodiment, the DC-AC conversion circuit includes an operational amplifier circuit and a MOS transistor. The operational amplifier circuit is used to generate a square-wave drive signal for driving the MOS transistor, and the MOS transistor is used to convert the first DC supply voltage into a first AC supply voltage and output it. The first DC supply voltage is +24V, and the effective value of the first AC supply voltage is approximately 20V.

[0046] Combined with Figure 3 , on the one hand, the first DC supply voltage in this embodiment can supply power to the outer loop circuit unit after passing through the first DC-DC conversion circuit. On the other hand, it can generate the first AC supply voltage through the DC-AC conversion circuit for coil coupling.

[0047] In this embodiment, the inner loop circuit unit has a strain detection bridge circuit, a front-end amplifier circuit, a V / F conversion circuit, and an infrared emission circuit connected in sequence. The strain detection bridge circuit is used to detect the torque load force at the shaft to be detected. The front-end amplifier circuit is used to amplify the signal generated by the strain detection bridge circuit. The V / F conversion circuit is used to convert the electrical signal amplified by the front-end amplifier circuit into a frequency signal. The infrared emission circuit is used to generate a flashing optical signal under the drive of the frequency signal.

[0048] Specifically, after the power supply problem of the inner loop circuit unit is solved by the DC-AC conversion circuit and the AC-DC conversion circuit in this embodiment of the measurement system, it can further measure the torque load force to be detected in real time through the strain detection bridge circuit, the front-end amplifier circuit, the V / F conversion circuit, and the infrared emission circuit connected in sequence, and transmit it non-contactingly through the optical signal of the infrared emission circuit.

[0049] In this embodiment, the infrared emission circuit includes an infrared diode drive circuit and a plurality of infrared diodes connected in parallel.

[0050] In this embodiment, the outer loop circuit unit has an infrared receiving circuit and a frequency output circuit connected in sequence. The infrared receiving circuit is used to detect the flashing optical signal generated by the infrared emission circuit and output it to the frequency output circuit. The frequency output circuit is used to process the signal sent by the infrared receiving circuit to generate a detection signal, and the detection signal is a frequency signal.

[0051] Combined with Figure 6 and Figure 7 , in this embodiment, through the infrared receiving circuit and the frequency output circuit, the optical signal corresponding to the measured torque load force can be stably received and output, so as to facilitate subsequent processing by an external circuit.

[0052] In this embodiment, the detection signal is a frequency signal, and the detection signal is output through an external circuit.

[0053] In this embodiment, the external circuit includes an F / V conversion circuit, which is used to convert the detection signal into a voltage signal and output it.

[0054] Embodiment 2

[0055] Similar to Embodiment 1, the difference from Embodiment 1 is that in this embodiment, the detection device includes a device body 500. The device body 500 includes a connecting body 510 with a hollow along the axis. The first end of the connecting body 510 is used to connect with the output end of the driving part, and the second end of the connecting body 510 is used to connect with the load part to be measured.

[0056] At a position near the first end of the connecting body 510, a hollow mounting opening 610 is formed; a strain beam 620 is provided at the mounting opening 610. Both ends of the strain beam 620 are connected to the two side walls of the mounting opening 610. A resistance strain gauge 630 is installed in the middle of the strain beam 620. The resistance strain gauge 630 is used to access the strain bridge; the resistance strain gauge 630 is also used to deform under force to generate a voltage change amount on the strain bridge; the voltage change amount is used to correspond to the torque load force on the connecting body 510.

[0057] Specifically, when the device body 500 in this embodiment is in use, first, the first end and the second end of the connecting body 510 are respectively connected to the driving part for driving and the load part to be measured; that is, the connecting body 510 itself can play a role similar to that of a coupling to realize the transmission between the driving part and the load part.

[0058] At the same time, the connecting body 510 and the load part can rotate synchronously under the drive of the driving part, and the torque at the connecting body 510 can preferably reflect the torque of the load part. Further, in this embodiment, a strain bridge is formed by the resistance strain gauge 630 to measure the torque at the connecting body 510; in order to measure the torque more sensitively, in this embodiment, the resistance strain gauge 630 is installed on the strain beam 620, and the strain beam 620 is located at the hollow mounting opening 610.

[0059] Compared with the solid part, the area of the hollow mounting opening 610 has a relatively larger rotational deformation during rotation, so that the resistance strain gauge 630 can also form a larger deformation. The change in the resistance value of the resistance strain gauge 630 can also increase with the increase in deformation, and at the same time, the voltage change amount of the strain bridge is also increased. In this way, it can play a role similar to amplification, so that the observation of the rotational torque is more sensitive, and the detected torque load can be accurately reflected through the change in the electrical signal preferably.

[0060] Moreover, both ends of the strain beam 620 are directly connected to the side walls of the mounting opening 610, so that the deformation sensitivity of the strain beam 620 gradually increases from both ends to the middle, and deformation is more likely to occur in the middle. Therefore, in this embodiment, the resistance strain gauge 630 is selected to be disposed at the middle of the strain beam 620 to improve the sensitivity and accuracy of measurement.

[0061] In this embodiment, the connecting body 510 includes a main shaft 640. First connecting grooves 641 and second connecting grooves 642 are respectively formed at both ends of the main shaft 640. The first connecting groove 641 and the second connecting groove 642 respectively form the first end and the second end of the connecting body 510, and are respectively used for connecting the power shaft of the driving part and the load shaft of the load part.

[0062] In this embodiment, a first flat groove opening 6411 for connecting and transmitting with the output end of the driving part is provided at the inner wall of the first connecting groove 641, and a second flat groove opening 6421 for connecting and transmitting with the load part is provided at the inner wall of the second connecting groove 642.

[0063] Specifically, the first flat groove opening 6411 and the second flat groove opening 6421 can preferably form a stable connection between the main shaft 640, the driving part, and the load part.

[0064] In this embodiment, an installation ring 650 is coaxially expanded at a position near the first end of the main shaft 640, and the mounting opening 610 is formed through the installation ring 650; a plurality of mounting openings 610 are provided and are circumferentially distributed along the circumference of the installation ring 650.

[0065] In this embodiment, a plate body 710 is formed at a position of the installation ring 650 above the strain beam 620. A plurality of first threaded holes 720 are formed at both ends of the plate body 710; a plurality of second threaded holes 730 are also formed at both ends of the strain beam 620.

[0066] In this embodiment, the first threaded holes 720 and the second threaded holes 730 correspond to each other one by one and are spaced apart along the circumference of the installation ring 650; the first threaded holes 720 and the second threaded holes 730 are used for screwing in adjustment bolts to adjust the connection tightness between the strain beam 620 and the plate body 710.

[0067] Specifically, the hollow mounting opening 610 itself can improve the deformation sensitivity. However, based on different measurement requirements, an overly large change in the strain bridge voltage corresponds to a larger detection range. When applied to different loads, the torque itself is large, and after the deformation is amplified by the hollow mounting opening 610, it may cause an overly large voltage change, which will instead lead to poor accuracy of the measurement result and low detection precision.

[0068] Therefore, in this embodiment, a plate body 710 is provided, and the first threaded holes 720 at the plate body 710 can cooperate with the second threaded holes 730 at the strain beam 620. On the basis of the above-mentioned "both ends of the strain beam 620 are directly connected to the side walls of the mounting openings 610, so that the deformation sensitivity of the strain beam 620 gradually increases from both ends to the middle", the deformation condition of the strain beam 620 is further adjusted and refined. By screwing adjustment bolts into the first threaded holes 720 and the second threaded holes 730 at different positions, the amount of deformation at the middle part of the strain beam 620 can be reduced to suit different measurement requirements, thereby improving the detection accuracy.

[0069] In this embodiment, the device body 500 further includes a cylindrical fixed housing 520 coaxial with the connecting body 510, and the main shaft 640 can be located inside the fixed housing 520. Circular first end plates 660 and second end plates 670 are respectively connected to both ends of the fixed housing 520. A plurality of first screw holes 661 for inserting positioning bolts are formed at the first end plate 660, and the first end plate 660 is used for fixedly connecting with the driving part. A bearing is provided at the middle part of the second end plate 670, and the bearing is used for installing the second end of the main shaft 640.

[0070] In this embodiment, an annular first mounting seat 810 is provided at the side wall of the first end plate 660 close to the strain beam 620, and the first mounting seat 810 is coaxially arranged with the main shaft 640. An outer ring plate 820 is provided at the first mounting seat 810. A second mounting seat 1010 is coaxially formed at the main shaft 640, and an inner ring plate 1020 is provided at the side wall of the second mounting seat 1010 close to the first mounting seat 810. The inner ring plate 1020 is used to supply power to the strain bridge and transmit the signal generated by the voltage change amount to the outer ring plate 820, and the outer ring plate 820 is used to output the received signal to an external circuit.

[0071] Specifically, the fixed housing 520 is fixedly connected to the driving part to form a stator for fixedly installing the outer ring plate 820 and facilitating access to an external power supply terminal. The main shaft 640 moves with the load to form a rotor, thereby being used for measuring the load to be detected. The inner ring plate 1020 cooperates with the strain bridge to output a voltage signal, and then outputs it to an external circuit through the outer ring plate 820 for integration and analysis, so as to measure the corresponding torque.

[0072] In this embodiment, a code disk 830 for counting is provided at the side wall of the second mounting seat 1010 far from the first mounting seat 810.

[0073] In this embodiment, a first coil 1110 is provided on the inner wall of the fixed housing 520. The first coil 1110 is powered and used to supply power to the outer ring plate 820. A second coil 680 is coaxially arranged on the main shaft 640, and the position of the second coil 680 corresponds to that of the first coil 1110. The second coil 680 is coupled with the first coil 1110 and used to supply power to the inner ring plate 1020.

[0074] It can be understood that the fixed housing 520 serves as a stator. The first coil 1110 supplies power to the outer ring plate 820, and then the first coil 1110 supplies power to the second coil 680 by coupling with the second coil 680. The second coil 680 then supplies power to the inner ring plate 1020.

[0075] Therefore, the device body 500 in this embodiment can stably achieve the installation and fixation, power supply, and signal transmission of the outer ring plate 820 and the inner ring plate 1020 through the fixed housing 520 (stator) and the main shaft 640 (rotor).

[0076] Embodiment 3

[0077] This embodiment provides a test method based on the detection system in Embodiment 1 and the detection device in Embodiment 2. In this embodiment, a regulated power supply is used to provide a 24V DC power supply for the entire system. The second end of the main shaft 640 is fixed on a bench vise, and the first end uses a manual torque wrench as the input torque of the driving part. At the same time, a high-precision digital multimeter is used to measure the output voltage.

[0078] Two groups of data are measured respectively. The torque intervals of the two groups of data are 2 and 5 respectively. For each input torque, 10 experiments are carried out, the output voltages are recorded respectively and filled into a table, and the average values of the 10 times are taken as the final output results.

[0079] In order to explore the relationship between the input torque and the output voltage from the measured data, a non-linear fitting method is adopted. A polynomial is used to fit the input and output data. In this project, a second-order polynomial is adopted, and the form is shown in formula (1).

[0080] y = a * x 2 + b * x + c (1)

[0081] Based on the measured data, the least squares fitting method is adopted, and the result is:

[0082] When the interval is 2: a = 3.04616868084370e-06, b = 0.0171205681134474, c = 2.40820212494671

[0083] When the interval is 5: a = -3.41412354415450e-05, b = 0.0209271148459384, c = 2.33573395252838

[0084] By analyzing the experimental results, it can be seen that the quadratic coefficients a under both intervals are very small. Thus, it can be obtained that the measurement data shows an approximate linear relationship between the input torque (measured torque) and the output voltage. The intuitive results are as Figure 15 and 16 shown. The figure respectively shows the relationship curve between the actual measurement data and the relationship curve between the input and output after fitting. It can be intuitively seen from the curve that there is an approximate linear relationship between the input torque and the output voltage; that is, the detection linearity of the detection system in this embodiment is high and the measurement accuracy is good.

[0085] It is easy to understand that those skilled in the art can combine, split, recombine, etc. the embodiments of the present application based on one or several embodiments provided by the present application to obtain other embodiments, and these embodiments do not exceed the protection scope of the present application.

[0086] The above has schematically described the present invention and its implementation manners. This description is not restrictive. What is shown in the embodiments is only part of the implementation manners of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative efforts without departing from the purpose of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A torque measurement system, characterized in that: It includes a detection device and a detection module installed on the detection device; the detection device has a fixed housing (520), and a connecting body (510) is rotatably arranged inside the fixed housing (520); the connecting body (510) is used to realize the connection between the power shaft and the load shaft, and the power shaft and the load shaft together form the to-be-detected rotating shaft. The detection module includes an inner ring circuit unit arranged at the connecting body (510) and an outer ring circuit unit arranged at the fixed housing (520), and the inner ring circuit unit and the outer ring circuit unit are arranged independently; the inner ring circuit unit is used to detect the torque load force at the to-be-detected rotating shaft to generate an optical signal, and the outer ring circuit unit is used to detect the optical signal to generate a detection signal.

2. The torque measurement system according to claim 1, wherein: The outer ring circuit unit has a DC-AC conversion circuit, and the inner ring circuit unit has a DC-AC conversion circuit; the DC-AC conversion circuit has a first coil (1110), and the AC-DC conversion circuit has a second coil (680); the DC-AC conversion circuit is used to convert the input first DC supply voltage into a first AC supply voltage and couple it to the second coil (680) through the first coil (1110), and the AC-DC conversion circuit is used to convert the coupled voltage at the second coil (680) into a second DC supply voltage for powering the inner ring circuit unit.

3. A torque measurement system according to claim 2, characterized in that: The AC-DC conversion circuit includes a first terminal, a full-bridge rectifier circuit and a first voltage stabilizing circuit connected in sequence. The first terminal is used to connect to the second coil (680), and the second DC supply voltage is +5V.

4. A torque measurement system according to claim 2, characterized in that: The outer ring circuit unit has a first DC-DC conversion circuit. The first DC-DC conversion circuit includes a second voltage stabilizing circuit, and the second voltage stabilizing circuit is used to convert the first DC supply voltage into a third DC supply voltage of +12V, and the third DC supply voltage is used to power the outer ring circuit unit.

5. A torque measurement system according to claim 2, characterized in that: The DC-AC conversion circuit includes an operational amplifier circuit and a MOS transistor. The operational amplifier circuit is used to generate a square wave drive signal for driving the MOS transistor, and the MOS transistor is used to convert the first DC supply voltage into a first AC supply voltage and output it; the first DC supply voltage is +24V, and the effective value of the first AC supply voltage is about 20V.

6. A torque measurement system according to claim 1, wherein: The inner ring circuit unit has a strain detection bridge circuit, a front-end amplifier circuit, a V / F conversion circuit and an infrared emission circuit connected in sequence; the strain detection bridge circuit is used to detect the torque load force at the to-be-detected rotating shaft, the front-end amplifier circuit is used to amplify the signal generated by the strain detection bridge circuit, the V / F conversion circuit is used to convert the electrical signal amplified by the front-end amplifier circuit into a frequency signal, and the infrared emission circuit is used to generate a flashing optical signal under the drive of the frequency signal.

7. A torque measurement system according to claim 2, characterized in that: The infrared emission circuit includes an infrared diode drive circuit and a plurality of infrared diodes connected in parallel.

8. A torque measurement system according to claim 6, characterized in that: The outer ring circuit unit has an infrared receiving circuit and a frequency output circuit connected in sequence. The infrared receiving circuit is used to detect the flashing optical signal generated by the infrared emission circuit and output it to the frequency output circuit, and the frequency output circuit is used to process the signal sent by the infrared receiving circuit to generate a detection signal, and the detection signal is a frequency signal.

9. A torque measurement system according to claim 1, characterized in that: The detection signal is a frequency signal, and the detection signal is output through an external circuit.

10. A torque measurement system according to claim 1, characterized in that: The external circuit includes an F / V conversion circuit, and the F / V conversion circuit is used to convert the detection signal into a voltage signal and output it.

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