Temperature compensation method, eddy current sensor, flywheel energy storage system and storage medium

Abstract

The invention discloses a temperature compensation method, an eddy current sensor, a flywheel energy storage system and a storage medium, and relates to the technical field of sensors. The method comprises the following steps: acquiring a real-time resistance value of a sampling piece, and determining a temperature change value and a real-time temperature according to the real-time resistance value of the sampling piece; determining a resistance change value of the induction coil according to the temperature change value and a preset resistance value of the induction coil at the preset temperature; when the induction coil induces the measured object, acquiring a sampling impedance value and an input voltage of the induction coil at the real-time temperature, and determining a sampling current value of the induction coil at the real-time temperature according to the sampling impedance value and the input voltage; determining the real output voltage of the induction coil according to the sampling current value, the preset resistance value and the resistance change value of the induction coil; and the displacement of the measured object is determined according to the real output voltage of the induction coil. The accuracy of the measurement result of the eddy current sensor can be improved, so that the reliability of magnetic suspension of the flywheel energy storage system is improved.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a temperature compensation method for an eddy current sensor, an eddy current sensor, a flywheel energy storage system, and a storage medium. Background Art

[0002] Magnetic levitation flywheel energy storage technology is a technology that uses the high-speed rotation of the flywheel rotor to convert electrical energy into mechanical energy for storage and then release the energy. In the flywheel energy storage system, eddy current sensors play an important role. Eddy current sensors use an induction coil with high-frequency excitation to generate induced eddy currents in the object being measured (such as a flywheel), and convert the distance change between the induction coil and the object being measured into a change in the impedance of the induction coil, thereby obtaining the displacement information of the object being measured.

[0003] However, the temperature inside the measured object (especially the flywheel) will change with the rotational speed. The existing eddy current sensors do not compensate and correct for temperature changes, which will greatly affect the accuracy of the measurement results and seriously affect the reliability of the magnetic levitation of the flywheel energy storage system. Summary of the invention

[0004] Based on this, the present application provides a temperature compensation method for an eddy current sensor, an eddy current sensor, a flywheel energy storage system and a storage medium, which can improve the accuracy of the measurement results of the eddy current sensor, thereby improving the reliability of the magnetic levitation of the flywheel energy storage system.

[0005] In a first aspect, the present application provides a temperature compensation method for an eddy current sensor, wherein the eddy current sensor comprises an induction coil and a sampling element, wherein the induction coil is used to generate an alternating magnetic field and detect changes in the magnetic field caused by the movement of a measured object, and the impedance of the induction coil changes with changes in the magnetic field, and the sampling element is used to sample the temperature of the eddy current sensor, and the temperature compensation method comprises: Acquiring the real-time resistance value of the sampling component, and determining the temperature change value and the real-time temperature according to the real-time resistance value of the sampling component; Determining a resistance change value of the induction coil according to the temperature change value and a preset resistance value of the induction coil at a preset temperature; When the induction coil senses the object to be measured, a sampled impedance value and an input voltage of the induction coil at the real-time temperature are obtained, and a sampled current value of the induction coil at the real-time temperature is determined according to the sampled impedance value and the input voltage; determining a real output voltage of the induction coil according to a sampled current value of the induction coil at the real-time temperature, a preset resistance value of the induction coil at a preset temperature, and the resistance change value; The displacement of the measured object is determined according to the actual output voltage of the induction coil.

[0006] In a second aspect, the present application provides an eddy current sensor, the eddy current sensor comprising a housing, an induction coil, a sampling element, a resistance detection circuit and a signal processing circuit; The induction coil is arranged in the housing, and is used to generate an alternating magnetic field and detect changes in the magnetic field caused by the movement of the object being measured, and the impedance of the induction coil changes with changes in the magnetic field; The sampling member is arranged in the housing; A resistance detection circuit is disposed in the housing and connected to the sampling element, the resistance detection circuit is used to obtain a preset resistance value and a real-time resistance value of the sampling element, determine a temperature change value and a real-time temperature according to the real-time resistance value of the sampling element, and determine a resistance change value of the induction coil according to the temperature change value and the preset resistance value; A signal processing circuit is arranged in the shell and connected to the resistance detection circuit. The signal processing circuit is used to obtain the sampled impedance value and input voltage of the induction coil at the real-time temperature when the induction coil senses the object to be measured, and determine the sampled current value of the induction coil at the real-time temperature according to the sampled impedance value and the input voltage; determine the real output voltage of the induction coil according to the sampled current value of the induction coil at the real-time temperature, the preset resistance value of the induction coil at a preset temperature, and the resistance change value; and determine the displacement of the object to be measured according to the real output voltage of the induction coil.

[0007] In a third aspect, the present application provides an eddy current sensor, the eddy current sensor comprising a memory and a processor; The memory is used to store computer programs; The processor is used to implement the temperature compensation method of the eddy current sensor as described above when executing the computer program.

[0008] In a fourth aspect, the present application provides a flywheel energy storage system, which includes an eddy current sensor and a flywheel body as described above, and the eddy current sensor is used to detect the displacement of the flywheel body.

[0009] In a fifth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor implements the temperature compensation method of the eddy current sensor as described above.

[0010] The present application provides a temperature compensation method for an eddy current sensor, an eddy current sensor, a flywheel energy storage system and a storage medium, which specifically obtains the real-time resistance value of a sampling component, and determines the temperature change value and the real-time temperature according to the real-time resistance value of the sampling component; determines the resistance change value of the induction coil according to the temperature change value and the preset resistance value of the induction coil at a preset temperature; when the induction coil senses the object to be measured, obtains the sampled impedance value and input voltage of the induction coil at the real-time temperature, and determines the sampled current value of the induction coil at the real-time temperature according to the sampled impedance value and the input voltage; determines the real output voltage of the induction coil according to the sampled current value of the induction coil at the real-time temperature, the preset resistance value of the induction coil at the preset temperature and the resistance change value; determines the displacement of the object to be measured according to the real output voltage of the induction coil. In this way, the real output voltage of the induction coil after eliminating the temperature effect can be accurately calculated, so that the displacement of the object to be measured can be accurately measured, and the reliability of the magnetic levitation of the flywheel energy storage system can be further improved.

[0011] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of the structure of an eddy current sensor provided in an embodiment of the present application; Figure 2 It is a schematic diagram of the steps of a temperature compensation method for an eddy current sensor provided in an embodiment of the present application; Figure 3 is a schematic block diagram of the structure of an eddy current sensor provided in an embodiment of the present application; Figure 4 is a schematic block diagram of the structure of an eddy current sensor provided in an embodiment of the present application; Figure 5 It is a schematic block diagram of the structure of a flywheel energy storage system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0014] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0015] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present application, and have no special meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0016] In the related technology, as the temperature increases, the resistance of the induction coil in the eddy current sensor and the object being measured may increase. The increase in the resistance of the induction coil and the object being measured will cause a corresponding increase in loss, which may weaken the magnetic field strength generated by the excitation current, thereby reducing the intensity of the eddy current. Changes in the intensity and distribution of the eddy current will cause the output signal of the eddy current sensor to change, which will greatly affect the accuracy of the measurement results and seriously affect the reliability of the magnetic levitation of the flywheel energy storage system.

[0017] In order to solve the above problems, the present application provides a temperature compensation method of an eddy current sensor, an eddy current sensor, a flywheel energy storage system and a storage medium, specifically by obtaining the real-time resistance value of the sampling component, and determining the temperature change value and the real-time temperature according to the real-time resistance value of the sampling component; determining the resistance change value of the induction coil according to the temperature change value and the preset resistance value of the induction coil at the preset temperature; when the induction coil senses the object to be measured, obtaining the sampling impedance value and input voltage of the induction coil at the real-time temperature, and determining the sampling current value of the induction coil at the real-time temperature according to the sampling impedance value and the input voltage; determining the real output voltage of the induction coil according to the sampling current value of the induction coil at the real-time temperature, the preset resistance value of the induction coil at the preset temperature and the resistance change value; determining the displacement of the object to be measured according to the real output voltage of the induction coil. In this way, the real output voltage of the induction coil after eliminating the temperature effect can be accurately calculated, so that the displacement of the object to be measured can be accurately measured, and the reliability of the magnetic levitation of the flywheel energy storage system can be further improved.

[0018] Before introducing the temperature compensation method of the eddy current sensor provided by the present application, the structure of the eddy current sensor provided by the present application is first introduced.

[0019] See also Figure 1 , Figure 1 It is a structural schematic diagram of an eddy current sensor provided in an embodiment of the present application.

[0020] like Figure 1 As shown, the eddy current sensor 100 may include a housing 10 , a potting compound 20 , a frame 30 , a coil protective shell 40 , an induction coil 41 , a sampling component 50 , a switching circuit board 60 , a high-temperature cable 70 , a shielding wire 80 and a signal processor 90 .

[0021] The housing 10 is an external protective structure of the eddy current sensor 100, which is used to protect the internal coils, circuits and other precision components from damage by external environments such as mechanical shock, dust, oil, and moisture, thereby extending the life of the eddy current sensor 100. The potting glue 20 is used to solidify and encapsulate the internal components such as the induction coil 41 and the circuit board to prevent the components from loosening and displacement due to vibration or impact, thereby ensuring the stability of the structure. The skeleton 30, as a supporting structure for the induction coil 41, can ensure the geometric shape and position stability of the induction coil 41, avoid deformation due to mechanical vibration or temperature change, and thus ensure measurement accuracy. The coil protection shell 40 is used to set the induction coil 41 in the housing to protect the induction coil 41 from damage by external environments such as mechanical shock, dust, oil, and moisture, effectively avoiding abnormalities of the induction coil 41, thereby extending the life of the induction coil 41. The adapter circuit board 60 is used to convert the weak impedance change detected by the induction coil 41 into a processable electrical signal. The high-temperature cable 70 is generally made of special materials (such as silicone or polytetrafluoroethylene insulation layer) to ensure reliable signal transmission. The signal processor 90 is used to amplify and filter (de-noise) the weak eddy current signal (such as impedance change) detected by the induction coil 41, thereby converting it into a voltage value.

[0022] In the embodiment of the present application, the induction coil 41 is used to generate an alternating magnetic field and detect the magnetic field changes caused by the movement of the object being measured, and the impedance of the induction coil 41 will change with the change of the magnetic field. The sampling component 50 is used to sample the temperature of the eddy current sensor 100.

[0023] Exemplarily, the sampling member 50 may be a sampling copper wire, which is disposed inside the eddy current sensor 100 to sample the temperature of the eddy current sensor 100 .

[0024] Exemplarily, the induction coil 41 can be fixedly arranged inside the coil protective shell 40, and the skeleton 30 can be glued to the induction coil 41 by glue, and then the lead wire and the shielding wire 80 of the induction coil 41 are welded together, and then the sampling copper wire is welded to the adapter circuit board 60, and then the high-temperature cable 70 is welded to the adapter circuit board 60, and then the skeleton 30 and the adapter circuit board 60 are bonded by glue, and then the outer shell 10 is bonded to the coil protective shell 40 and the potting glue 20 is prepared for potting. After the potting glue 20 is cured, the high-temperature cable 70 and the shielding wire 80 are respectively welded to the signal processor 90 to realize signal transmission with the signal processor 90.

[0025] See also Figure 2 , Figure 2 It is a schematic flow chart of the steps of a temperature compensation method for an eddy current sensor provided in an embodiment of the present application.

[0026] like Figure 2As shown, the temperature compensation method of the eddy current sensor includes: steps S101 to S105.

[0027] S101, obtaining a real-time resistance value of a sampling component, and determining a temperature change value and a real-time temperature according to the real-time resistance value of the sampling component.

[0028] The sampling component 50 is arranged inside the eddy current sensor 100. The sampling component 50 can be a device such as a sampling copper wire that can sample the temperature of the eddy current sensor 100. The real-time resistance value of the sampling component 50 can change with the temperature change. The temperature change value is used to represent the temperature difference between the real-time temperature and the preset temperature. The real-time temperature is used to represent the temperature of the eddy current sensor 100 at the current moment, and the preset temperature is used to represent the temperature of the eddy current sensor 100 at the preset moment, which can be considered as normal temperature.

[0029] In some embodiments, the temperature change value is determined according to the preset resistance value of the sampling element 50 at the preset temperature and the acquired real-time resistance value; the real-time temperature is determined according to the preset temperature and the temperature change value. Thus, the real-time temperature can be accurately determined by the sampling element 50.

[0030] The preset resistance value of the sampling element 50 at the preset temperature is pre-sampled and stored in the eddy current sensor 100. The temperature change value is used to represent the temperature difference between the real-time temperature and the preset temperature.

[0031] Since the real-time resistance value of the sampling component 50 changes with the temperature, if the real-time temperature is different from the preset temperature, the preset resistance value of the sampling component 50 and its corresponding real-time resistance value will generally be different. Therefore, the temperature change value can be calculated by obtaining the preset resistance value of the sampling component 50 at the preset temperature and the real-time resistance value obtained by real-time sampling; finally, the real-time temperature is calculated by the preset temperature and the temperature change value.

[0032] Exemplarily, the calculated temperature change value can be expressed by the formula:

[0033] in, is the temperature change value, is the real-time resistance value of the sampling element 50, is the preset resistance value of the sampling element 50, is the temperature coefficient of resistance, which can be determined according to actual conditions.

[0034] Therefore, the real-time resistance value of the sampling element 50 can be and the preset resistance value of the sampling element 50 Substitute it into the above formula to calculate the temperature change value .

[0035] Exemplarily, the calculation of real-time temperature can be expressed by the formula:

[0036] in, is the real-time temperature, is the preset temperature.

[0037] It should be noted that Can be positive or negative. If the value is positive, the real-time temperature will be higher than the preset temperature. If it is a negative value, the real-time temperature will be lower than the preset temperature, which is not specifically limited here.

[0038] S102 . Determine a resistance change value of the induction coil according to the temperature change value and a preset resistance value of the induction coil at a preset temperature.

[0039] The preset resistance value of the induction coil 41 at the preset temperature is pre-sampled and stored in the eddy current sensor 100. The resistance change value of the induction coil 41 is used to represent the resistance difference between the induction coil 41 at the real-time temperature and the preset temperature.

[0040] Exemplarily, the calculation of the resistance change value of the induction coil 41 can be expressed by the formula:

[0041] in, is the resistance change value of the induction coil 41, is the preset resistance value of the induction coil 41 at a preset temperature, is the resistance temperature coefficient, which can be determined according to actual conditions. is the temperature change value.

[0042] Therefore, the preset resistance value of the induction coil 41 at the preset temperature can be and the temperature change value of the sample 50 Substitute it into the above formula to calculate the resistance change value of the induction coil 41 .

[0043] It should be noted that Can be positive or negative. is a positive value, is also positive, if is a negative value, It is also a negative value and is not specifically limited here.

[0044] S103, when the induction coil senses the object to be measured, a sampled impedance value and an input voltage of the induction coil at the real-time temperature are obtained, and a sampled current value of the induction coil at the real-time temperature is determined according to the sampled impedance value and the input voltage.

[0045] When the object to be measured is close to the induction coil 41, the alternating magnetic field will induce eddy currents on the surface of the object to be measured. The eddy currents will generate a reverse magnetic field in the opposite direction to the original magnetic field, thereby changing the impedance of the induction coil 41. Therefore, the impedance of the induction coil 41 changes with the magnetic field.

[0046] In the embodiment of the present application, the sampled impedance value of the induction coil 41 is used to represent the impedance value of the induction coil 41 calculated at the real-time temperature, the input voltage of the induction coil 41 is used to represent the voltage value of the induction coil 41 at the real-time temperature, and the sampled current value of the induction coil 41 is used to represent the current value calculated at the real-time temperature.

[0047] In some embodiments, when the induction coil 41 senses the object to be measured, the sampled resistance value, inductance value and input voltage of the induction coil 41 at the real-time temperature are obtained; and the sampled impedance value of the induction coil 41 at the real-time temperature is determined according to the sampled resistance value and inductance value. In this way, the sampled impedance value of the induction coil 41 at the real-time temperature can be accurately calculated.

[0048] Exemplarily, the sampled resistance value, inductance value and input voltage of the induction coil 41 at the real-time temperature can be directly sampled and obtained.

[0049] Exemplarily, the calculation of the sampled impedance value of the induction coil 41 at the real-time temperature can be expressed by the formula:

[0050]

[0051] in, is the sampled impedance value of the induction coil 41 at the real-time temperature and when the object to be measured is close to it, is the sampling resistance value of the induction coil 41 at the real-time temperature and when the object to be measured is close to it, is the real-time inductance value of the induction coil 41 when the object to be measured is close to it, and f is the frequency of the input voltage.

[0052] Therefore, the sampled resistance value of the induction coil 41 at the real-time temperature and when the object to be measured is close to the object to be measured can be and the real-time inductance value of the induction coil 41 when the object to be measured is close to Substitute into the above formula for calculation, and then calculate the sampling impedance value of the induction coil 41 at the real-time temperature and when the measured object is close to it. .

[0053] Exemplarily, the calculation of the sampled current value of the induction coil 41 at the real-time temperature can be expressed by the formula:

[0054] in, is the sampling current value of the induction coil 41 at the real-time temperature and when the object to be measured is close to it, is the input voltage of the induction coil 41, is the sampled impedance value of the induction coil 41 at the real-time temperature when the object to be measured is close to it.

[0055] Therefore, the sampled impedance value of the induction coil 41 at the real-time temperature and when the object to be measured is close to the object to be measured can be and the input voltage of the induction coil 41 at the real-time temperature Substitute into the above formula for calculation, and then calculate the sampling current value of the induction coil 41 at the real-time temperature and when the object to be measured is close to it. .

[0056] S104, determining a real output voltage of the induction coil according to the sampled current value of the induction coil at the real-time temperature, the preset resistance value of the induction coil at the preset temperature, and the resistance change value.

[0057] The sampled current value of the induction coil 41 at the real temperature can be calculated based on the sampled impedance value and the input voltage. The real output voltage of the induction coil 41 is used to represent the output voltage of the induction coil 41 after eliminating the temperature effect.

[0058] In some embodiments, the actual resistance value of the induction coil 41 is determined based on the preset resistance value and resistance change value of the induction coil 41 at the preset temperature; the actual output voltage of the induction coil 41 is determined based on the sampled current value and the actual resistance value of the induction coil 41 at the real temperature. In this way, the output voltage of the induction coil 41 after eliminating the temperature effect can be accurately calculated.

[0059] Exemplarily, the actual resistance value of the induction coil 41 can be calculated using the formula:

[0060] in, is the actual resistance value of the induction coil 41 at the real temperature when the object to be measured is close to it, is the resistance change value of the induction coil 41, is the preset resistance value of the induction coil 41 at a preset temperature.

[0061] Exemplarily, the actual output voltage of the induction coil 41 can be calculated using the formula:

[0062] At this time, the actual output voltage of the induction coil 41 is It is the output voltage of the induction coil 41 after eliminating the temperature influence.

[0063] S105. Determine the displacement of the object to be measured according to the actual output voltage of the induction coil.

[0064] Among them, the displacement of the measured object can be used to evaluate the reliability of the magnetic levitation of the flywheel energy storage system, so the accuracy of its parameters is crucial.

[0065] Exemplarily, the calculated real output voltage of the induction coil 41 may be sent to the signal processor 90 in the form of a signal, and the signal processor 90 amplifies, filters (denoises), etc. the signal, and finally outputs the displacement of the object being measured.

[0066] The temperature compensation method of the eddy current sensor 100 provided in the present application obtains the real-time resistance value of the sampling component 50, and determines the temperature change value and the real-time temperature according to the real-time resistance value of the sampling component 50; determines the resistance change value of the induction coil 41 according to the temperature change value and the preset resistance value of the induction coil 41 at the preset temperature; when the induction coil 41 senses the object to be measured, obtains the sampled impedance value and input voltage of the induction coil 41 at the real-time temperature, and determines the sampled current value of the induction coil 41 at the real-time temperature according to the sampled impedance value and the input voltage; determines the real output voltage of the induction coil according to the sampled current value of the induction coil 41 at the real-time temperature, the preset resistance value of the induction coil 41 at the preset temperature, and the resistance change value; determines the displacement of the object to be measured according to the real output voltage of the induction coil 41. In this way, the real output voltage of the induction coil 41 after eliminating the temperature effect can be accurately calculated, so that the displacement of the object to be measured can be accurately measured, and the reliability of the magnetic suspension of the flywheel energy storage system can be further improved.

[0067] See also Figure 3 , Figure 3 It is a schematic block diagram of the structure of an eddy current sensor provided in an embodiment of the present application.

[0068] like Figure 1 and Figure 3 As shown, the eddy current sensor 100 includes a shell, an induction coil 41, a sampling component 50, a resistance detection circuit 11 and a signal processing circuit 12; the induction coil 41 is arranged in the shell, and the induction coil 41 is used to generate an alternating magnetic field and detect the magnetic field changes caused by the movement of the object to be measured, and the impedance of the induction coil 41 changes with the change of the magnetic field; the sampling component 50 is arranged in the shell.

[0069] The housing, the induction coil 41 and the sampling member 50 have been described above, and reference may be made to the above related embodiments, which will not be repeated here.

[0070] The resistance detection circuit 11 is arranged in the shell and connected to the sampling component 50. The resistance detection circuit 11 is used to obtain the preset resistance value and the real-time resistance value of the sampling component 50, and determine the temperature change value and the real-time temperature according to the real-time resistance value of the sampling component 50, and determine the resistance change value of the induction coil 41 according to the temperature change value and the preset resistance value; the signal processing circuit 12 is arranged in the shell and connected to the resistance detection circuit 11. The signal processing circuit 12 is used to obtain the sampling impedance value and the input voltage of the induction coil 41 at the real-time temperature when the induction coil 41 senses the object to be measured, and determine the sampling current value of the induction coil 41 at the real-time temperature according to the sampling impedance value and the input voltage; determine the real output voltage of the induction coil 41 according to the sampling current value of the induction coil 41 at the real-time temperature, the preset resistance value of the induction coil 41 at the preset temperature, and the resistance change value; determine the displacement of the object to be measured according to the real output voltage of the induction coil 41.

[0071] Exemplarily, the resistance detection circuit 11 can sample and obtain a preset resistance value and a real-time resistance value of the sampling element 50 , so as to determine the resistance change value of the induction coil 41 according to the temperature change value and the preset resistance value.

[0072] It should be noted that the specific embodiment of determining the resistance change value of the induction coil 41 according to the temperature change value and the preset resistance value has been described above, and reference may be made to the above related embodiments, which will not be repeated here.

[0073] Exemplarily, the signal processing circuit 12 can obtain the sampled impedance value and input voltage of the induction coil 41 at the real-time temperature, and determine the sampled current value of the induction coil 41 at the real-time temperature according to the sampled impedance value and the input voltage; determine the actual output voltage of the induction coil 41 according to the sampled current value of the induction coil 41 at the real-time temperature, the preset resistance value and resistance change value of the induction coil 41 at the preset temperature; and determine the displacement of the object under test according to the actual output voltage of the induction coil 41.

[0074] It should be noted that the sampled impedance value and input voltage of the induction coil 41 at the real-time temperature are obtained, and the sampled current value of the induction coil 41 at the real-time temperature is determined according to the sampled impedance value and the input voltage; the real output voltage of the induction coil 41 is determined according to the sampled current value of the induction coil 41 at the real-time temperature, the preset resistance value of the induction coil 41 at the preset temperature, and the resistance change value; the specific embodiment of determining the displacement of the object to be measured according to the real output voltage of the induction coil 41 has been described in the previous text, and reference may be made to the relevant embodiments above, which will not be repeated here.

[0075] In some embodiments, the eddy current sensor 100 further includes a coil protection shell disposed on the housing, and the coil protection shell is used to provide an accommodation space so that the induction coil 41 is fixedly disposed in the accommodation space of the coil protection shell.

[0076] Among them, the coil protection shell 40 is used to place the induction coil 41 in the shell to protect the induction coil 41 from damage by the external environment such as mechanical impact, dust, oil, moisture, etc., effectively avoiding abnormalities of the induction coil 41, thereby extending the life of the induction coil 41.

[0077] In some embodiments, the material of the coil protection shell 40 is a material with a negative thermal expansion coefficient, or the material of the coil protection shell is tungsten zirconate.

[0078] For example, if the material of the coil protection shell 40 can be a material with a negative thermal expansion coefficient, then as the temperature rises, the coil protection shell 40 will shrink instead of expand, thereby effectively suppressing thermal expansion displacement of the shell 10, potting compound 20, skeleton 30, and induction coil 41, which is beneficial to controlling thermal stress and dimensional stability.

[0079] For example, the material of the coil protection shell can be tungsten zirconate (ZrW2O8), which exhibits negative thermal expansion characteristics in a wide temperature range (-273°C- 777°C), and its thermal expansion coefficient is -8.7×10 -6 K -1 .

[0080] See also Figure 4 , Figure 4 is a schematic block diagram of the structure of an eddy current sensor provided in an embodiment of the present application. Figure 4 In the embodiment, the eddy current sensor 100 includes a processor 110 and a memory 120, wherein the processor 110 and the memory 120 are connected via a bus, and the bus may be any applicable bus such as an I2C (Inter-integrated Circuit) bus.

[0081] The memory 120 may include a storage medium and an internal memory. The storage medium may store an operating system and a computer program. The computer program includes program instructions, which, when executed, may enable the processor to execute the temperature compensation method of the eddy current sensor described in any embodiment.

[0082] The processor 110 is used to provide computing and control capabilities to support the operation of the entire eddy current sensor 100 .

[0083] The processor 110 may be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other types of processors such as programmable logic devices, discrete gate or transistor logic devices, and discrete hardware components. A general-purpose processor may be a microprocessor, or may be any conventional processor.

[0084] The processor 110 is used to run the computer program stored in the memory 120, and implements the following steps when executing the computer program: Acquiring the real-time resistance value of the sampling component, and determining the temperature change value and the real-time temperature according to the real-time resistance value of the sampling component; Determining a resistance change value of the induction coil according to the temperature change value and a preset resistance value of the induction coil at a preset temperature; When the induction coil senses the object to be measured, a sampled impedance value and an input voltage of the induction coil at the real-time temperature are obtained, and a sampled current value of the induction coil at the real-time temperature is determined according to the sampled impedance value and the input voltage; determining a real output voltage of the induction coil according to a sampled current value of the induction coil at the real-time temperature, a preset resistance value of the induction coil at a preset temperature, and the resistance change value; The displacement of the measured object is determined according to the actual output voltage of the induction coil.

[0085] In some embodiments, when the processor 110 obtains the temperature change value and the real-time temperature determined according to the real-time resistance value of the sampling component, it is used to implement: The temperature change value is determined according to the preset resistance value of the sampling component at the preset temperature and the acquired real-time resistance value; and the real-time temperature is determined according to the preset temperature and the temperature change value.

[0086] In some embodiments, when the processor 110 implements the acquisition of the sampled impedance value and the input voltage of the induction coil at the real-time temperature when the induction coil senses the object to be measured, it is configured to implement: When the induction coil senses the object to be measured, the sampled resistance value, inductance value and input voltage of the induction coil at the real-time temperature are obtained; and the sampled impedance value of the induction coil at the real-time temperature is determined according to the sampled resistance value and inductance value.

[0087] In some embodiments, when the processor 110 implements the determining of the actual output voltage of the induction coil according to the sampled current value of the induction coil at the real-time temperature, the preset resistance value of the induction coil at the preset temperature, and the resistance change value, it is configured to implement: The real resistance value of the induction coil is determined according to the preset resistance value of the induction coil at the preset temperature and the resistance change value; the real output voltage of the induction coil is determined according to the sampled current value of the induction coil at the real-time temperature and the real resistance value.

[0088] See also Figure 5 , Figure 5 It is a schematic block diagram of the structure of a flywheel energy storage system provided in an embodiment of the present application.

[0089] like Figure 5 As shown, the flywheel energy storage system 1000 includes the eddy current sensor 100 and the flywheel body 200 as described in any of the above embodiments, and the eddy current sensor 100 is used to detect the displacement of the flywheel body 200. The flywheel energy storage system 1000 can accurately measure the displacement of the object being measured, and its reliability is high.

[0090] The present application also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor implements any of the temperature compensation methods for eddy current sensors described above.

[0091] The computer-readable storage medium may be an internal storage unit of the flywheel energy storage system controller, such as a hard disk or memory. The computer-readable storage medium may also be an external storage device of the flywheel energy storage system controller, such as a plug-in hard disk, smart memory card, secure digital card, flash memory card, etc.

[0092] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0093] In hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transient medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0094] The preferred embodiments of the present application are described above with reference to the accompanying drawings, but the scope of the present application is not limited thereby. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present application shall be within the scope of the present application.

Claims

1. A temperature compensation method for an eddy current sensor, characterized in that: The eddy current sensor includes an induction coil and a sampling piece, wherein the induction coil is used to generate an alternating magnetic field and detect the change of the magnetic field caused by the movement of the object to be measured, and the impedance of the induction coil changes with the change of the magnetic field, and the sampling piece is used to sample the temperature of the eddy current sensor, and the temperature compensation method includes: Acquiring the real-time resistance value of the sampling component, and determining the temperature change value and the real-time temperature according to the real-time resistance value of the sampling component; Determining a resistance change value of the induction coil according to the temperature change value and a preset resistance value of the induction coil at a preset temperature; When the induction coil senses the object to be measured, a sampled impedance value and an input voltage of the induction coil at the real-time temperature are obtained, and a sampled current value of the induction coil at the real-time temperature is determined according to the sampled impedance value and the input voltage; determining a real output voltage of the induction coil according to a sampled current value of the induction coil at the real-time temperature, a preset resistance value of the induction coil at a preset temperature, and the resistance change value; The displacement of the measured object is determined according to the actual output voltage of the induction coil.

2. The method according to claim 1, characterized in that The step of determining the temperature change value and the real-time temperature according to the real-time resistance value of the sampling element comprises: Determine the temperature change value according to the preset resistance value of the sampling component at the preset temperature and the acquired real-time resistance value; The real-time temperature is determined according to the preset temperature and the temperature change value.

3. The method according to claim 1, characterized in that When the induction coil senses the object to be measured, obtaining the sampled impedance value and input voltage of the induction coil at the real-time temperature includes: When the induction coil senses the object to be measured, a sampled resistance value, an inductance value and an input voltage of the induction coil at the real-time temperature are obtained; The sampled impedance value of the induction coil at the real-time temperature is determined according to the sampled resistance value and the inductance value.

4. The method according to claim 1, characterized in that: The determining the real output voltage of the induction coil according to the sampled current value of the induction coil at the real-time temperature, the preset resistance value of the induction coil at the preset temperature and the resistance change value comprises: determining a real resistance value of the induction coil according to a preset resistance value of the induction coil at the preset temperature and the resistance change value; The actual output voltage of the induction coil is determined according to the sampled current value of the induction coil at the real temperature and the actual resistance value.

5. An eddy current sensor, characterized in that: The eddy current sensor comprises: case; an induction coil, arranged in the housing, the induction coil being used to generate an alternating magnetic field and detect changes in the magnetic field caused by the movement of the object being measured, and the impedance of the induction coil changes with changes in the magnetic field; A sampling member, disposed in the housing; a resistance detection circuit, arranged in the housing and connected to the sampling element, the resistance detection circuit being used to obtain a preset resistance value and a real-time resistance value of the sampling element, determine a temperature change value and a real-time temperature according to the real-time resistance value of the sampling element, and determine a resistance change value of the induction coil according to the temperature change value and the preset resistance value; A signal processing circuit is arranged in the shell and connected to the resistance detection circuit. The signal processing circuit is used to obtain the sampled impedance value and input voltage of the induction coil at the real-time temperature when the induction coil senses the object to be measured, and determine the sampled current value of the induction coil at the real-time temperature according to the sampled impedance value and the input voltage; determine the real output voltage of the induction coil according to the sampled current value of the induction coil at the real-time temperature, the preset resistance value of the induction coil at a preset temperature, and the resistance change value; and determine the displacement of the object to be measured according to the real output voltage of the induction coil.

6. The eddy current sensor according to claim 5, characterized in that: The eddy current sensor also includes: The coil protection shell is arranged on the shell, and the coil protection shell is used to provide an accommodating space so that the induction coil is fixedly arranged in the accommodating space of the coil protection shell.

7. The eddy current sensor according to claim 6, characterized in that: The material of the coil protection shell is a material with a negative thermal expansion coefficient, or the material of the coil protection shell is tungsten zirconate.

8. An eddy current sensor, characterized in that: The eddy current sensor includes a memory and a processor; The memory is used to store computer programs; The processor is used to implement the temperature compensation method of the eddy current sensor according to any one of claims 1 to 4 when executing the computer program.

9. A flywheel energy storage system, characterized in that: The flywheel energy storage system comprises an eddy current sensor as described in any one of claims 5 to 8 and a flywheel body, wherein the eddy current sensor is used to detect the displacement of the flywheel body.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor implements the temperature compensation method for an eddy current sensor according to any one of claims 1 to 4.

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