Fan shafting torque measuring system based on magnetoelastic effect

Abstract

The invention discloses a fan shafting torque measuring system based on magnetoelastic effect, which comprises a differential probe, an adjustable support, a signal processing box and a master control module, the adjustable support is L-shaped, the adjustable support comprises a fixed chassis and a telescopic vertical probe arm, the differential probe is fixedly installed at the bottom of a long plate of the adjustable support, and the signal processing box is connected with the differential probe. And a laser sensor mounting groove is formed in the middle of the differential probe. Compared with a traditional torque sensor, the non-contact torque sensor adopts a non-contact measurement mode, so that a to-be-measured system is prevented from being changed; disturbance compensation is carried out according to measurement data of the laser sensor, and the influence of air gap change in dynamic measurement is reduced; the signal processing module can eliminate the influence caused by various interferences in the working environment; the complete communication system can guarantee that the system can work normally even in a remote area, the method is suitable for the application scene of the draught fan, the requirements of workers are met, and the method is beneficial to application and popularization.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine shaft torque measurement, and in particular to a wind turbine shaft torque measurement system based on magnetoelastic effect. Background Art

[0002] A wind turbine is a complex mechatronic system, in which the transmission mechanism consists of blades, main shaft, gearbox, and other components. When a wind turbine is working, the blades first convert wind power into mechanical torque. The main shaft and blades are directly connected, and extremely high power needs to be transmitted at a very low speed, which makes the main shaft bear huge torque. In actual applications, the wind conditions are very complex, and the main shaft will continue to be subjected to complex alternating shocks. The torque on the main shaft is not only an important indicator of the safe operation of the wind turbine, but also reflects the efficiency of wind energy utilization. Therefore, remote real-time monitoring of the main shaft torque has become a technical hotspot in the field.

[0003] In the field of torque measurement, strain gauge torque sensors are widely used. The strain gauge is the core sensitive element. The resistance change caused by the deformation of the strain gauge is converted into bridge voltage change through the Wheatstone bridge. This sensor can detect the deformation of the object being measured and reflect its force condition. This measurement method has low cost, high measurement accuracy and good linearity.

[0004] Piezoelectric sensors are a commonly used form of force measurement. The basic principle is that piezoelectric materials generate charges when subjected to external stress. When the external force changes, the charge on the surface of the piezoelectric material will also change, resulting in a change in the output voltage. The biggest advantage of this sensor is that the material has a very high natural frequency and can respond quickly to changes in external force, thus having a very high response frequency.

[0005] Capacitive torque sensors use the property that the capacitance value changes when the capacitive material is deformed to measure the change in torque. The measurement circuit is generally composed of an RC or LC oscillation circuit. When the capacitance value changes, the oscillation frequency of the circuit will also change. By checking the change in this frequency, the change in the torque on the measured shaft surface can be sensed. This sensor has high sensitivity and is very suitable for high-speed dynamic torque measurement.

[0006] The photoelectric torque sensor will install two disc-shaped gratings on the shaft. When the shaft is subjected to torque, the light and dark stripes of the two gratings will change. The photosensitive material is used to detect these changes, and then a light intensity signal proportional to the torque is obtained. The main advantage of this measurement method is that it has a fast response speed and can achieve real-time measurement of torque, but the structure is relatively complex, the reliability is not high, and the anti-interference ability is poor, and the accuracy is easily affected by the external environment.

[0007] Although the above sensors have their own advantages, they also have many disadvantages. Strain sensors need to be connected in series to the main shaft, and photoelectric sensors need to engrave gratings on the surface of the shaft. These changes are difficult to implement in wind turbine scenarios; and piezoelectric and capacitive measurement methods have very high requirements on material properties and require the design of specific configurations, resulting in complex structures and poor anti-interference capabilities.

[0008] Magnetoelastic torque sensors are mainly sensors that work based on the magnetoelastic effect. The magnetoelastic effect refers to the phenomenon that the internal magnetic properties of ferromagnetic materials change when they are subjected to stress and strain. On a macro scale, this effect manifests itself as a change in the magnetic permeability of the material, which can be sensed by building a magnetic circuit. This measurement method can achieve non-contact measurement, but it has high installation requirements and is very sensitive to external interference and air gap changes. Summary of the invention

[0009] In order to solve the above technical problems, a fan shaft torque measurement system based on magnetoelastic effect is provided. Compared with traditional measurement methods, it can realize non-contact measurement and reduce changes to the system to be measured. It has flexible installation method, strong anti-interference ability, and is not easily affected by air gap changes. It can significantly improve measurement accuracy and sensitivity. The communication method is flexible and convenient, and the applicability is strong, which can realize remote real-time monitoring.

[0010] In order to achieve the above purpose, the technical solution adopted by the present invention is: A fan shaft torque measurement system based on magnetoelastic effect, comprising a differential probe, an adjustable bracket, a signal processing box and a main control module, wherein the adjustable bracket is L-shaped, the adjustable bracket comprises a fixed chassis and a retractable vertical probe arm, the differential probe is fixedly mounted on the bottom of the long plate of the adjustable bracket, a laser sensor mounting groove is provided in the middle of the differential probe, a laser sensor is mounted in the laser sensor mounting groove, two groups of coil guide grooves are further provided on the differential probe, a magnetic induction coil is mounted in the coil guide groove, and the signal processing box comprises a power supply module, a signal generation module, a signal acquisition module, a serial communication module and a G communication module, the signal generation module is connected to the magnetic induction coil via a wire, and the signal acquisition module is connected to the magnetic induction coil via a wire.

[0011] Preferably, the fixed chassis is provided with two groups, and both are fixedly connected to the translatable horizontal arm, the retractable vertical probe arm is arranged at one end of the long plate of the adjustable bracket, and the retractable vertical probe arm is connected to the adjustable bracket through an adjustable screw, and a front end fixing hole is provided on the retractable vertical probe arm.

[0012] Preferably, two groups of lateral fixing holes are opened on the outer side of the differential probe, and the laser sensor is fixedly connected to the differential probe through the lateral fixing holes.

[0013] Preferably, the two groups of coil guide grooves are symmetrical about the center line of the differential probe.

[0014] Preferably, the differential probe is also provided with a probe mounting hole.

[0015] Preferably, the magnetic induction coils are connected via a U-shaped ferrite core.

[0016] Preferably, the magnetic induction coil and the signal integration module are connected via a set of eight-core signal lines, and the eight-core signal lines are connected to the signal processing module via plug-in terminals.

[0017] Preferably, the power module, signal generation module, signal acquisition module, serial communication module and G communication module are all fixed to the bottom of the signal processing box by copper columns and screws.

[0018] Preferably, the signal generating module converts the digital signal output by the main control module into an analog signal and transmits it to the magnetic induction coil after enhancing it.

[0019] Preferably, the signal acquisition module phase-modulates and differentiates the signal from the magnetic induction coil and transmits it to the main control module.

[0020] Compared with the prior art, the present invention provides a fan shaft torque measurement system based on magnetoelastic effect, which has the following beneficial effects: Compared with traditional torque sensors, the present invention adopts a non-contact measurement method, avoiding changes to the system to be measured; disturbance compensation is performed based on the measurement data of the laser sensor, reducing the influence of air gap changes in dynamic measurement; the signal processing module can eliminate the influence of various interferences in the working environment; the complete communication system can ensure that the system can work normally even in remote areas, which is suitable for the application scenario of fans and meets the needs of staff. This method is conducive to popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the adjustable bracket in the present invention; Figure 3 It is a structural schematic diagram of the differential probe in the present invention; Figure 4 It is a signal processing flow chart of the present invention.

[0022] The numbers in the figure are: 1. Signal processing box; 2. Differential probe; 3. Adjustable bracket; 4. Antenna; 5. Eight-core signal cable; 6. Laser sensor signal cable; 7. Fixed chassis; 8. Translational horizontal arm; 9. Retractable vertical probe arm; 10. Adjustable screw; 11. Front fixing hole; 12. Coil guide groove; 13. Laser sensor installation groove; 14. Lateral fixing hole; 15. Probe installation hole. DETAILED DESCRIPTION

[0023] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0024] Example 1 Please refer to Figure 1-Figure 4 As shown, a wind turbine shaft torque measurement system based on magnetoelastic effect includes a differential probe 2, an adjustable bracket 3, a signal processing box 1 and a main control module. The adjustable bracket 3 is L-shaped, and the adjustable bracket 3 includes a fixed chassis 7 and a retractable vertical probe arm 9. The differential probe 2 is fixedly installed at the bottom of the long plate of the adjustable bracket 3. A laser sensor installation groove is opened in the middle of the differential probe 2, and a laser sensor is installed in the laser sensor installation groove. Two sets of coil guide grooves 12 are also provided on the differential probe 2, and magnetic induction coils are installed in the coil guide grooves 12. The signal processing box 1 includes a power module, a signal generation module, a signal acquisition module, a serial communication module and a 4G communication module. The signal generation module is connected to the magnetic induction coil through a wire, and the signal acquisition module is connected to the magnetic induction coil through a wire.

[0025] Two groups of fixed chassis 7 are provided, and both are fixedly connected to the translatable horizontal arm 8. The retractable vertical probe arm 9 is provided at one end of the long plate of the adjustable bracket 3, and the retractable vertical probe arm 9 is connected to the adjustable bracket 3 through an adjustable screw 10. A front end fixing hole 11 is provided on the retractable vertical probe arm 9.

[0026] Two groups of lateral fixing holes 14 are opened on the outer side of the differential probe 2 , and the laser sensor is fixedly connected to the differential probe 2 through the lateral fixing holes 14 .

[0027] The two groups of coil guide grooves 12 are symmetrical about the center line of the differential probe 2 .

[0028] The differential probe 2 is also provided with a probe mounting hole 15 .

[0029] The magnetic induction coils are connected via a U-shaped ferrite core.

[0030] The magnetic induction coil and the signal integration module are connected via a set of eight-core signal lines 5 , and the eight-core signal lines 5 are connected to the signal processing module via plug-in terminals.

[0031] The power module, signal generation module, signal acquisition module, serial communication module and 4G communication module are all fixed to the bottom of the signal processing box 1 by copper columns and screws.

[0032] The signal generation module converts the digital signal output by the main control module into an analog signal and transmits it to the magnetic induction coil after enhancing it.

[0033] The signal acquisition module phase-modulates and differentiates the signal from the magnetic induction coil and transmits it to the main control module.

[0034] Example 2 In the signal processing circuit module, the power module is connected to 12V DC through a power adapter and powers the entire circuit board; the signal generation module generates an excitation signal, which is first converted into an analog signal through a DAC, then amplified by an operational amplifier and output to two sets of magnetic induction coils; the signal acquisition module phase-modulates and differentiates the two sets of induction signals and inputs them into the ADC, which is then converted into digital signals through the ADC and input into the main control module; the 4G communication module transmits the torque data calculated by the main control module to the host computer; the serial port communication module is used to receive laser sensor data.

[0035] The PC host computer mainly consists of three parts. The control panel contains all control buttons. Clicking the "Scan Serial Port" button will list all currently available serial ports in the "Serial Port List"; "Open Serial Port" and "Close Serial Port" are used to open and close the serial port currently selected in the "Serial Port List"; "Get Data" and "Stop Getting" are used to start and stop receiving torque data; clicking "Clear Receiving Area" will clear all text data in the receiving area; the text receiving area will present the measurement data in the form of text, including torque value, laser sensor data, number of measurements, etc.; the image display area will present the torque changes over the past period of time in the form of a line graph.

[0036] The complete signal processing flow of the system is as follows: Figure 4 As shown. A sine wave signal generation program will be written inside the main control chip, and then the excitation signal will be output to the excitation coil through the DAC and power amplifier circuit; the signal in the induction coil will be converted into a digital signal after phase modulation, differential circuit and ADC conversion module and enter the main control chip; filtering, upsampling and other signal processing algorithms will be designed inside the main control chip, and the collected induced voltage will be converted into torque value; the main control chip can transmit the measurement output through 4G wireless communication or serial port wired communication.

[0037] In summary, compared with traditional torque sensors, the present invention adopts a non-contact measurement method, avoiding changes to the system to be measured; disturbance compensation is performed based on the measurement data of the laser sensor, reducing the influence of air gap changes in dynamic measurement; the signal processing module can eliminate the influence of various interferences in the working environment; the complete communication system can ensure that the system can work normally even in remote areas, which is suitable for the application scenario of fans and meets the needs of staff. This method is conducive to popularization and use.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A fan shaft torque measurement system based on magnetoelastic effect, characterized in that: The invention comprises a differential probe (2), an adjustable bracket (3), a signal processing box (1) and a main control module, wherein the adjustable bracket (3) is L-shaped, the adjustable bracket (3) comprises a fixed chassis (7) and a retractable vertical probe arm (9), the differential probe (2) is fixedly mounted on the bottom of the long plate of the adjustable bracket (3), a laser sensor mounting groove is provided in the middle of the differential probe (2), a laser sensor is mounted in the laser sensor mounting groove, and two groups of coil guide grooves (12) are also provided on the differential probe (2), a magnetic induction coil is mounted in the coil guide groove (12), and the signal processing box (1) comprises a power supply module, a signal generation module, a signal acquisition module, a serial communication module and a 4G communication module, the signal generation module is connected to the magnetic induction coil via a wire, and the signal acquisition module is connected to the magnetic induction coil via a wire.

2. The wind turbine shaft torque measurement system based on magnetoelastic effect according to claim 1 is characterized in that: The fixed chassis (7) is provided with two groups, and both are fixedly connected to the translatable horizontal arm (8). The retractable vertical probe arm (9) is provided at one end of the long plate of the adjustable bracket (3), and the retractable vertical probe arm (9) is connected to the adjustable bracket (3) via an adjustable screw (10). A front end fixing hole (11) is provided on the retractable vertical probe arm (9).

3. The wind turbine shaft torque measurement system based on magnetoelastic effect according to claim 1, characterized in that: Two groups of lateral fixing holes (14) are provided on the outer side of the differential probe (2), and the laser sensor is fixedly connected to the differential probe (2) via the lateral fixing holes (14).

4. The wind turbine shaft torque measurement system based on magnetoelastic effect according to claim 1, characterized in that: The two groups of coil guide grooves (12) are symmetrical about the center line of the differential probe (2).

5. The wind turbine shaft torque measurement system based on magnetoelastic effect according to claim 1, characterized in that: The differential probe (2) is also provided with a probe mounting hole (15).

6. The wind turbine shaft torque measurement system based on magnetoelastic effect according to claim 1, characterized in that: The magnetic induction coils are connected via a U-shaped ferrite core.

7. The wind turbine shaft torque measurement system based on magnetoelastic effect according to claim 1, characterized in that: The magnetic induction coil and the signal integration module are connected via a group of eight-core signal lines (5), and the eight-core signal lines (5) are connected to the signal processing module via plug-in terminals.

8. The wind turbine shaft torque measurement system based on magnetoelastic effect according to claim 1, characterized in that: The power module, signal generation module, signal acquisition module, serial communication module and 4G communication module are all fixed to the bottom of the signal processing box (1) by means of copper columns and screws.

9. The wind turbine shaft torque measurement system based on magnetoelastic effect according to claim 1, characterized in that: The signal generating module converts the digital signal output by the main control module into an analog signal and transmits it to the magnetic induction coil after enhancing it.

10. The wind turbine shaft torque measurement system based on magnetoelastic effect according to claim 1, characterized in that: The signal acquisition module phase-modulates and differentiates the signal from the magnetic induction coil and transmits it to the main control module.

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