Temperature Compensation Method, Eddy Current Sensor, Flywheel Energy Storage System and Storage Medium

Abstract

The present application discloses a temperature compensation method, an eddy current sensor, a flywheel energy storage system and a storage medium, relating to the technical field of sensors. The method includes: obtaining the real-time resistance value of a 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 an 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 a measured object, obtaining the sampled impedance value and the input voltage of the induction coil at the real-time temperature, and determining the sampled current value of the induction coil at the real-time temperature according to the sampled impedance value and the input voltage; determining the true output voltage of the induction coil according to the sampled current value, the preset resistance value and the resistance change value of the induction coil; and determining the displacement amount of the measured object according to the true output voltage of the induction coil. The present application can improve the accuracy of the measurement result of the eddy current sensor, thereby improving the reliability of the magnetic levitation of the flywheel energy storage system.

Description

Technical Field

[0001] The present application relates to the technical field of sensors, and particularly 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 a flywheel rotor to store electrical energy as mechanical energy and then release the energy. In a flywheel energy storage system, an eddy current sensor plays an important role. An eddy current sensor uses an induction coil with a high-frequency excitation to generate an induced eddy current in a measured object (such as a flywheel), and converts the change in the distance between the induction coil and the measured object into a change in the impedance of the induction coil, thereby obtaining the displacement information of the measured object.

[0003] However, the temperature inside the measured object (especially the flywheel) changes with the rotational speed, and the existing eddy current sensors do not compensate and correct for temperature changes, resulting in a significant impact on the accuracy of the measurement results and seriously affecting the reliability of magnetic levitation in 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 magnetic levitation in the flywheel energy storage system.

[0005] In a first aspect, the present application provides a temperature compensation method for an eddy current sensor. The eddy current sensor includes an induction coil and a sampling component. The induction coil is used to generate an alternating magnetic field and detect the magnetic field change caused by the movement of the measured object, and the impedance of the induction coil changes with the magnetic field change. The sampling component is used to sample the temperature of the eddy current sensor. The temperature compensation method includes:

[0006] Obtain the real-time resistance value of the sampling component, and determine the temperature change value and the real-time temperature according to the real-time resistance value of the sampling component;

[0007] Determine 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;

[0008] When the induction coil senses the measured object, obtain the sampling impedance value and the input voltage of the induction coil at the real-time temperature, and determine the sampling current value of the induction coil at the real-time temperature according to the sampling impedance value and the input voltage;

[0009] Determine the true output voltage of the induction coil based on 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;

[0010] Determine the displacement of the object to be measured based on the true output voltage of the induction coil.

[0011] In a second aspect, the present application provides an eddy current sensor, which includes a housing, an induction coil, a sampling component, a resistance detection circuit, and a signal processing circuit;

[0012] The induction coil is arranged in the housing, and the induction coil is used to generate an alternating magnetic field and detect the magnetic field change caused by the movement of the object to be measured, and the impedance of the induction coil changes with the magnetic field change;

[0013] The sampling component is arranged in the housing;

[0014] The resistance detection circuit is arranged in the housing and connected to the sampling component. The resistance detection circuit is used to obtain the preset resistance value and the real-time resistance value of the sampling component, determine the temperature change value and the real-time temperature according to the real-time resistance value of the sampling component, and determine the resistance change value of the induction coil according to the temperature change value and the preset resistance value;

[0015] The signal processing circuit is arranged in the housing and connected to the resistance detection circuit. When the induction coil senses the object to be measured, the signal processing circuit is used to obtain the sampled impedance value and the input voltage of the induction coil at the real-time temperature, 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 true 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; determine the displacement of the object to be measured according to the true output voltage of the induction coil.

[0016] In a third aspect, the present application provides an eddy current sensor, which includes a memory and a processor;

[0017] The memory is used to store a computer program;

[0018] The processor is used to implement the temperature compensation method of the eddy current sensor as described above when executing the computer program.

[0019] In a fourth aspect, the present application provides a flywheel energy storage system, which includes the eddy current sensor as described above and a flywheel body, and the eddy current sensor is used to detect the displacement of the flywheel body.

[0020] In a fifth aspect, the present application provides a computer-readable storage medium storing a computer program, which when executed by a processor causes the processor to implement the temperature compensation method of the eddy current sensor as described above.

[0021] 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. Specifically, by obtaining the real-time resistance value of a sampling component and determining the temperature change value and 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 a preset temperature; when the induction coil senses a measured object, 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 true 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; and determining the displacement amount of the measured object according to the true output voltage of the induction coil. Thus, the true output voltage of the induction coil after eliminating the temperature influence can be accurately calculated, so that the displacement of the measured object can be accurately measured, and further the reliability of the magnetic levitation of the flywheel energy storage system can be improved.

[0022] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of an eddy current sensor provided by an embodiment of the present application;

[0024] Figure 2 is a schematic flow chart of the steps of a temperature compensation method for an eddy current sensor provided by an embodiment of the present application;

[0025] Figure 3 is a schematic block diagram of the structure of an eddy current sensor provided by an embodiment of the present application;

[0026] Figure 4 is a schematic block diagram of the structure of an eddy current sensor provided by an embodiment of the present application;

[0027] Figure 5 is a schematic block diagram of the structure of a flywheel energy storage system provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0029] The flowcharts shown in the accompanying drawings are only illustrative, and do not necessarily include all the contents and operations / steps, nor do they necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, combined, or partially merged, so the actual execution order may change according to the actual situation.

[0030] In subsequent descriptions, the use of suffixes such as "module", "component", or "unit" to represent elements is only for the convenience of describing the present application, and they have no specific meaning of their own. Therefore, "module", "component", or "unit" can be used interchangeably.

[0031] In the related art, as the temperature rises, the resistance of the induction coil in the eddy current sensor and the measured object may increase. The increase in the resistance of the induction coil and the measured object will cause the corresponding increase in losses, which may weaken the magnetic field intensity generated by the excitation current, thereby reducing the intensity of the eddy current. The change in the intensity of the eddy current and the change in its distribution will cause the output signal of the eddy current sensor to change, resulting in a large impact on the accuracy of the measurement result and seriously affecting the reliability of the magnetic levitation of the flywheel energy storage system.

[0032] To solve the above problems, 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. Specifically, by obtaining the real-time resistance value of the sampling component, and determining the temperature change value and 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 measured object, 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 input voltage; determining the true 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 measured object according to the true output voltage of the induction coil. Thus, the true output voltage of the induction coil after eliminating the temperature influence can be accurately calculated, so that the displacement of the measured object can be accurately measured, and further the reliability of the magnetic levitation of the flywheel energy storage system can be improved.

[0033] Before introducing the temperature compensation method of the eddy current sensor provided by this application, the structure of the eddy current sensor provided by this application will be introduced first.

[0034] See Figure 1 , Figure 1 which is a schematic structural diagram of an eddy current sensor provided by an embodiment of this application.

[0035] As Figure 1 shown, the eddy current sensor 100 may include a housing 10, potting glue 20, a skeleton 30, a coil protective shell 40, an induction coil 41, a sampling component 50, an adapter circuit board 60, a high-temperature cable 70, a shielded wire 80, and a signal processor 90.

[0036] The housing 10 is an external protection structure of the eddy current sensor 100, which is used to protect internal components such as coils and circuits from damage by external environments such as mechanical shocks, dust, oil stains, and moisture, and extend the lifespan of the eddy current sensor 100. The potting glue 20 is used to cure and encapsulate internal components such as the induction coil 41 and the circuit board, preventing components from loosening and displacing due to vibration or shock, and ensuring structural stability. The skeleton 30 serves as a support structure for the induction coil 41, which can ensure the geometric shape and position of the induction coil 41 are stable, avoiding deformation caused by mechanical vibration or temperature changes, thereby guaranteeing measurement accuracy. The coil protective shell 40 is used to place the induction coil 41 inside the shell to protect the induction coil 41 from damage by external environments such as mechanical shocks, dust, oil stains, and moisture, effectively avoiding abnormalities in the induction coil 41, and thus extending the lifespan 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 a silicone or polytetrafluoroethylene insulation layer) to ensure reliable signal transmission. The signal processor 90 is used to amplify and filter (denoise) the weak eddy current signal (such as impedance change) detected by the induction coil 41, and thus convert it into a voltage value.

[0037] In the embodiment of this application, the induction coil 41 is used to generate an alternating magnetic field and detect the magnetic field change caused by the movement of the measured object, and the impedance of the induction coil 41 will change with the magnetic field change. The sampling component 50 is used to sample the temperature of the eddy current sensor 100.

[0038] Exemplarily, the sampling component 50 may be a sampling copper wire, and the sampling copper wire is arranged inside the eddy current sensor 100 to sample the temperature of the eddy current sensor 100.

[0039] 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.

[0040] 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.

[0041] like Figure 2 As shown, the temperature compensation method of the eddy current sensor includes: steps S101 to S105.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] Since the real-time resistance value of the sampling component 50 changes with 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 generally will also 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 can be calculated through the preset temperature and the temperature change value.

[0047] Exemplarily, the calculation of the temperature change value can be expressed by the formula:

[0048]

[0049] Wherein, is the temperature change value, is the real-time resistance value of the sampling component 50, is the preset resistance value of the sampling component 50, is the temperature coefficient of resistance, and the temperature coefficient of resistance can be determined according to the actual situation.

[0050] Therefore, the real-time resistance value of the sampling component 50 and the preset resistance value of the sampling component 50 can be substituted into the above formula for calculation, so as to calculate the temperature change value .

[0051] Exemplarily, the calculation of the real-time temperature can be expressed by the formula:

[0052]

[0053] Wherein, is the real-time temperature, is the preset temperature.

[0054] It should be noted that, can be a positive value or a negative value. If is a positive value, the real-time temperature will be higher than the preset temperature. If is a negative value, the real-time temperature will be lower than the preset temperature, and no specific limitation is made here.

[0055] S102. Determine 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.

[0056] Wherein, the preset resistance value of the induction coil 41 at the preset temperature is obtained by pre-sampling and stored in the eddy current sensor 100. The resistance change value of the induction coil 41 is used to represent the resistance difference of the induction coil 41 at the real-time temperature and the preset temperature.

[0057] Exemplarily, the calculation of the resistance change value of the induction coil 41 can be expressed by the formula:

[0058]

[0059] Among them, is the resistance change value of the induction coil 41, is the preset resistance value of the induction coil 41 at the preset temperature, is the temperature coefficient of resistance, and the temperature coefficient of resistance can be determined according to the actual situation, is the temperature change value.

[0060] Therefore, the preset resistance value of the induction coil 41 at the preset temperature and the temperature change value of the sampling part 50 can be substituted into the above formula for calculation, so as to calculate the resistance change value of the induction coil 41.

[0061] It should be noted that, can be a positive value or a negative value. If is a positive value, is also a positive value. If is a negative value, is also a negative value, and no specific limitation is made here.

[0062] S103. When the induction coil senses the object to be measured, obtain the sampling impedance value and input voltage of the induction coil at the real-time temperature, and determine the sampling current value of the induction coil at the real-time temperature according to the sampling impedance value and input voltage.

[0063] When the object to be measured approaches the induction coil 41, an alternating magnetic field will induce eddy currents on the surface of the object to be measured, and the eddy currents will generate a reverse magnetic field opposite to the direction of 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.

[0064] In the embodiment of the present application, the sampling impedance value of the induction coil 41 is used to represent the impedance value calculated by the induction coil 41 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 sampling current value of the induction coil 41 is used to represent the current value calculated at the real-time temperature.

[0065] In some embodiments, when the induction coil 41 senses the object to be measured, obtain the sampling resistance value, inductance value and input voltage of the induction coil 41 at the real-time temperature; according to the sampling resistance value and inductance value, determine the sampling impedance value of the induction coil 41 at the real-time temperature. Thus, the sampling impedance value of the induction coil 41 at the real-time temperature can be accurately calculated.

[0066] Exemplarily, the sampled resistance value, inductance value, and input voltage of the induction coil 41 at the real-time temperature can be directly sampled.

[0067] Exemplarily, the calculation of the sampled impedance value of the induction coil 41 at the real-time temperature can be expressed by the formula:

[0068]

[0069]

[0070] where, is the sampled impedance value of the induction coil 41 at the real-time temperature when the object to be measured is close, is the sampled resistance value of the induction coil 41 at the real-time temperature when the object to be measured is close, is the real-time inductance value of the induction coil 41 when the object to be measured is close, and f is the frequency of the input voltage.

[0071] Therefore, the sampled resistance value of the induction coil 41 at the real-time temperature when the object to be measured is close and the real-time inductance value of the induction coil 41 when the object to be measured is close can be substituted into the above formula for calculation, so as to calculate the sampled impedance value of the induction coil 41 at the real-time temperature when the object to be measured is close.

[0072] Exemplarily, the calculation of the sampled current value of the induction coil 41 at the real-time temperature can be expressed by the formula:

[0073]

[0074] where, is the sampled current value of the induction coil 41 at the real-time temperature when the object to be measured is close, 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.

[0075] Therefore, the sampled impedance value of the induction coil 41 at the real-time temperature when the object to be measured is close and the input voltage of the induction coil 41 at the real-time temperature can be substituted into the above formula for calculation, so as to calculate the sampled current value of the induction coil 41 at the real-time temperature when the object to be measured is close.

[0076] S104. Determine the true 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.

[0077] Among them, the sampled current value of the induction coil 41 at the real-time temperature can be calculated based on the sampled impedance value and the input voltage. The true output voltage of the induction coil 41 is used to represent the output voltage of the induction coil 41 after eliminating the temperature influence.

[0078] In some embodiments, the true resistance value of the induction coil 41 is determined according to the preset resistance value and the resistance change value of the induction coil 41 at the preset temperature; the true output voltage of the induction coil 41 is determined according to the sampled current value and the true resistance value of the induction coil 41 at the real-time temperature. Thus, the output voltage of the induction coil 41 after eliminating the temperature influence can be accurately calculated.

[0079] Exemplarily, the calculation of the true resistance value of the induction coil 41 can be expressed by the formula:

[0080]

[0081] Among them, is the true resistance value of the induction coil 41 at the real-time temperature and when the measured object is close, is the resistance change value of the induction coil 41, is the preset resistance value of the induction coil 41 at the preset temperature.

[0082] Exemplarily, the calculation of the true output voltage of the induction coil 41 can be expressed by the formula:

[0083]

[0084] At this time, the true output voltage of the induction coil 41 is the output voltage of the induction coil 41 after eliminating the temperature influence.

[0085] S105. Determine the displacement of the measured object according to the true output voltage of the induction coil.

[0086] 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.

[0087] Exemplarily, the calculated true output voltage of the induction coil 41 can be sent to the signal processor 90 in the form of a signal, and the signal processor 90 performs amplification, filtering (denoising) processing, etc. on the signal, and finally outputs the displacement of the measured object.

[0088] The temperature compensation method of the eddy current sensor 100 provided by this 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 sampling impedance value and the input voltage of the induction coil 41 at the real-time temperature, and determines the sampling current value of the induction coil 41 at the real-time temperature according to the sampling impedance value and the input voltage; determines the true output voltage of the induction coil 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; determines the displacement of the object to be measured according to the true output voltage of the induction coil 41. Thus, the true output voltage of the induction coil 41 after eliminating the temperature influence can be accurately calculated, so that the displacement of the object to be measured can be accurately measured, and further the reliability of the magnetic suspension of the flywheel energy storage system can be improved.

[0089] See Figure 3 , Figure 3 which is a schematic structural block diagram of an eddy current sensor provided by an embodiment of this application.

[0090] As Figure 1 and Figure 3 shown, the eddy current sensor 100 includes a housing, 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 housing, and the induction coil 41 is used to generate an alternating magnetic field and detect the magnetic field change caused by the movement of the object to be measured, and the impedance of the induction coil 41 changes with the magnetic field change; the sampling component 50 is arranged in the housing.

[0091] Among them, the housing, the induction coil 41, and the sampling component 50 have been described above, and reference can be made to the relevant embodiments above, and no repeated description will be made here.

[0092] The resistance detection circuit 11 is disposed inside the housing and connected to the sampling member 50. The resistance detection circuit 11 is configured to obtain the preset resistance value and the real-time resistance value of the sampling member 50, determine the temperature change value and the real-time temperature according to the real-time resistance value of the sampling member 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 disposed inside the housing and connected to the resistance detection circuit 11. The signal processing circuit 12 is configured 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. 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 true output voltage of the induction coil 41. Determine the displacement of the object to be measured according to the true output voltage of the induction coil 41.

[0093] Exemplarily, the resistance detection circuit 11 can sample the preset resistance value and the real-time resistance value of the sampling member 50, so as to be able to determine the resistance change value of the induction coil 41 according to the temperature change value and the preset resistance value.

[0094] It should be noted that the specific embodiments for determining the resistance change value of the induction coil 41 according to the temperature change value and the preset resistance value have been described above. Reference can be made to the relevant embodiments above, and no repeated description will be given here.

[0095] Exemplarily, the signal processing circuit 12 can obtain the sampling impedance value and the input voltage of the induction coil 41 at the real-time temperature, 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. 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 true output voltage of the induction coil 41. Determine the displacement of the object to be measured according to the true output voltage of the induction coil 41.

[0096] It should be noted that the specific embodiments for obtaining the sampling impedance value and the input voltage of the induction coil 41 at the real-time temperature, determining the sampling current value of the induction coil 41 at the real-time temperature according to the sampling impedance value and the input voltage. 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 true output voltage of the induction coil 41. Determine the displacement of the object to be measured according to the true output voltage of the induction coil 41 have been described above. Reference can be made to the relevant embodiments above, and no repeated description will be given here.

[0097] In some embodiments, the eddy current sensor 100 further includes a coil protection shell disposed on the housing. The coil protection shell is used to provide an accommodation space for fixedly arranging the induction coil 41 within the accommodation space of the coil protection shell.

[0098] Among them, the coil protection shell 40 is used to arrange the induction coil 41 within the housing to protect the induction coil 41 from damage by external environments such as mechanical shock, dust, oil, and moisture, effectively avoiding abnormalities in the induction coil 41 and thus extending the lifespan of the induction coil 41.

[0099] 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 zirconium tungstate.

[0100] Exemplarily, 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 contract rather than expand, thus effectively suppressing thermal expansion displacement of the housing 10, potting adhesive 20, skeleton 30, and induction coil 41, which is beneficial to controlling thermal stress and dimensional stability.

[0101] Exemplarily, the material of the coil protection shell can be zirconium tungstate (ZrW2O8), which exhibits negative thermal expansion characteristics within a wide temperature range (-273°C - 777°C), and its coefficient of thermal expansion is -8.7×10 -6 K -1 。

[0102] Please refer to Figure 4 , Figure 4 which is a schematic block diagram of the structure of an eddy current sensor provided by an embodiment of the present application. In Figure 4 ,the eddy current sensor 100 includes a processor 110 and a memory 120. Among them, the processor 110 and the memory 120 are connected through a bus, and this bus can be any applicable bus such as the I2C (Inter-integrated Circuit) bus.

[0103] Among them, the memory 120 can include a storage medium and an internal memory. The storage medium can store an operating system and a computer program. This computer program includes program instructions, and when the program instructions are executed, they can cause the processor to execute the temperature compensation method of the eddy current sensor described in any embodiment.

[0104] The processor 110 is used to provide computing and control capabilities to support the operation of the entire eddy current sensor 100.

[0105] Among them, the processor 110 may be a Central Processing Unit (CPU), and the processor may also be a general-purpose processor, a Digital Signal Processor (DSP), an application specific integrated circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and other types of processors. The general-purpose processor may be a microprocessor, or the general-purpose processor may also be any conventional processor, etc.

[0106] Among them, the processor 110 is used to run the computer program stored in the memory 120 and implement the following steps when executing the computer program:

[0107] Obtain the real-time resistance value of the sampling component, and determine the temperature change value and the real-time temperature according to the real-time resistance value of the sampling component;

[0108] Determine 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;

[0109] When the induction coil senses the object to be measured, obtain the sampling impedance value and the input voltage of the induction coil at the real-time temperature, and determine the sampling current value of the induction coil at the real-time temperature according to the sampling impedance value and the input voltage;

[0110] Determine the true 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;

[0111] Determine the displacement amount of the object to be measured according to the true output voltage of the induction coil.

[0112] In some embodiments, when the processor 110 realizes determining the temperature change value and the real-time temperature according to the real-time resistance value of the sampling component, it is used to realize:

[0113] Determine the temperature change value according to the preset resistance value of the sampling component at the preset temperature and the obtained real-time resistance value; determine the real-time temperature according to the preset temperature and the temperature change value.

[0114] In some embodiments, when the processor 110 implements obtaining 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 used to implement:

[0115] When the induction coil senses the object to be measured, obtain the sampled resistance value, inductance value, and input voltage of the induction coil at the real-time temperature; determine the sampled impedance value of the induction coil at the real-time temperature according to the sampled resistance value and inductance value.

[0116] In some embodiments, when the processor 110 implements determining the true 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 used to implement:

[0117] Determine the true resistance value of the induction coil according to the preset resistance value of the induction coil at the preset temperature and the resistance change value; determine the true output voltage of the induction coil according to the sampled current value of the induction coil at the real-time temperature and the true resistance value.

[0118] Please refer to Figure 5 , Figure 5 which is a schematic block diagram of a flywheel energy storage system provided by an embodiment of the present application.

[0119] As Figure 5 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. 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 to be measured and has high reliability.

[0120] The present application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor is caused to implement the temperature compensation method of the eddy current sensor as described in any of the above.

[0121] Among them, the computer-readable storage medium may be an internal storage unit of the above flywheel energy storage system controller, such as a hard disk or a memory. The computer-readable storage medium may also be an external storage device of the above flywheel energy storage system controller, such as a plug-in hard disk, a smart memory card, a secure digital card, a flash memory card, and so on.

[0122] Those of ordinary skill in the art can understand that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices can be implemented as software, firmware, hardware, and their appropriate combinations.

[0123] In a 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, one physical component may have multiple functions, or one function or step may be executed by the cooperation of several physical components. Some or all of the 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 transitory 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 includes but is not limited to RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, 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 transmission mechanism, and may include any information delivery media.

[0124] The preferred embodiments of the present application have been illustrated above with reference to the accompanying drawings, and thus do not limit the scope of the rights of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present application shall be within the scope of the rights 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 component. The induction coil is used to generate an alternating magnetic field and detect the magnetic field change caused by the movement of the object to be measured, and the impedance of the induction coil changes with the magnetic field change. The sampling component is used to sample the temperature of the eddy current sensor. The temperature compensation method includes: Obtain the real-time resistance value of the sampling component, and determine the temperature change value and the real-time temperature according to the real-time resistance value of the sampling component; Determine 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, obtain the sampled impedance value and the input voltage of the induction coil at the real-time temperature, 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 true 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; Determine the displacement of the object to be measured according to the true output voltage of the induction coil; The step of determining the true 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 includes: Determine the true resistance value of the induction coil according to the preset resistance value of the induction coil at the preset temperature and the resistance change value; Determine the true output voltage of the induction coil according to the sampled current value of the induction coil at the real-time temperature and the true resistance value; 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 component includes: Determine the temperature change value according to the preset resistance value of the sampling component at the preset temperature and the obtained real-time resistance value; Determine the real-time temperature according to the preset temperature and the temperature change value; 3. The method according to claim 1, wherein The step of, when the induction coil senses the object to be measured, obtaining the sampled impedance value and the input voltage of the induction coil at the real-time temperature includes: When the induction coil senses the object to be measured, obtain the sampled resistance value, inductance value and input voltage of the induction coil at the real-time temperature; Determine the sampled impedance value of the induction coil at the real-time temperature according to the sampled resistance value and the inductance value; 4. An eddy current sensor, characterized in that, The eddy current sensor includes: A housing; An induction coil disposed in the housing, the induction coil is used to generate an alternating magnetic field and detect the magnetic field change caused by the movement of the object to be measured, and the impedance of the induction coil changes with the magnetic field change; A sampling component disposed in the housing; A resistance detection circuit disposed in the housing and connected to the sampling component, the resistance detection circuit is used to obtain the preset resistance value and the real-time resistance value of the sampling component, determine the temperature change value and the real-time temperature according to the real-time resistance value of the sampling component, and determine the resistance change value of the induction coil according to the temperature change value and the preset resistance value; A signal processing circuit is disposed inside the housing and connected to the resistance detection circuit. The signal processing circuit is configured to, when the induction coil senses the object to be measured, obtain the sampled impedance value and the input voltage of the induction coil at the real-time temperature, 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 true 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 amount of the object to be measured according to the true output voltage of the induction coil. The step of determining the true 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 includes: Determining the true resistance value of the induction coil according to the preset resistance value of the induction coil at the preset temperature and the resistance change value; Determining the true output voltage of the induction coil according to the sampled current value of the induction coil at the real-time temperature and the true resistance value.

5. The eddy current sensor according to claim 4, characterized in that, The eddy current sensor further includes: A coil protective housing is disposed on the housing. The coil protective housing is configured to provide a receiving space so that the induction coil is fixedly disposed in the receiving space of the coil protective housing.

6. The eddy current sensor according to claim 5, characterized in that, The material of the coil protective housing is a material with a negative thermal expansion coefficient, and / or the material of the coil protective housing is tungsten zirconate.

7. An eddy current sensor, characterized in that, The eddy current sensor includes a memory and a processor; The memory is configured to store a computer program; The processor is configured to implement the temperature compensation method of the eddy current sensor according to any one of claims 1 to 3 when executing the computer program.

8. A flywheel energy storage system, characterized in that, The flywheel energy storage system includes the eddy current sensor according to any one of claims 4-7 and a flywheel body. The eddy current sensor is configured to detect the displacement amount of the flywheel body.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the processor is caused to implement the temperature compensation method of the eddy current sensor according to any one of claims 1-3.

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