Permanent magnet excitation loss detection method, device and equipment, storage medium and program product

Abstract

The invention relates to a permanent magnet excitation loss detection method and device, computer equipment, a computer readable storage medium and a computer program product. The method is applied to field loss detection of a plurality of permanent magnet blocks distributed on a rotor along the circumferential direction and the axial direction, and comprises the following steps: in the rotation process of the rotor, acquiring voltage signals of the plurality of permanent magnet blocks through an induction coil array in a magnetic measurement module; in the voltage signals collected by the induction coils arranged in the first direction, under the condition that a first target voltage signal of which the signal feature does not meet preset first signal feature distribution is detected, it is judged that the permanent magnet block corresponding to the first target voltage signal loses excitation; in the voltage signals collected by the induction coils arranged in the second direction, under the condition that a second target voltage signal with the signal characteristic not meeting preset second signal characteristic distribution is detected, it is judged that the permanent magnet block corresponding to the second target voltage signal loses excitation. By adopting the method, the detection efficiency of the field loss permanent magnet block can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of generator fault detection, and in particular to a method, device, computer equipment, computer-readable storage medium and computer program product for detecting demagnetization of a permanent magnet block. Background Art

[0002] The rotor of a permanent magnet wind turbine generator is composed of multiple magnetic poles, and each magnetic pole is formed by assembling multiple permanent magnet blocks. During the actual operation of a permanent magnet wind turbine generator, the rotor is often affected by some equipment conditions or environmental factors, causing some magnetic poles or some permanent magnet blocks on the magnetic poles to fail and lose magnetism, which will undoubtedly have an adverse effect on the power generation efficiency and economic benefits of the permanent magnet wind turbine generator.

[0003] In conventional technology, a Gauss meter or a magnetic pole detection pen is usually used to measure the surface magnetism of the magnetic pole, so as to determine whether the permanent magnet block is demagnetized and the position of the demagnetized permanent magnet block based on the surface magnetism.

[0004] However, since the number of magnetic poles on the rotor is quite large, the number of measurement points can reach thousands. If manual inspection and calibration are performed one by one, the workload will be extremely large and the efficiency will be very low. Summary of the invention

[0005] Based on this, it is necessary to provide a permanent magnet block demagnetization detection method, device, computer equipment, computer readable storage medium and computer program product that can improve the detection efficiency of demagnetized permanent magnet blocks in response to the above technical problems.

[0006] In a first aspect, the present application provides a permanent magnet block demagnetization detection method, which is applied to perform demagnetization detection on multiple permanent magnet blocks distributed circumferentially and axially on a rotor, and the method comprises:

[0007] During the rotation of the rotor, the voltage signals of the plurality of permanent magnet blocks are collected through the induction coil array in the magnetic measurement module, wherein the induction coil array is composed of a plurality of induction coils arranged along a first direction and a second direction, the first direction is parallel to the cross section of the rotor, and the second direction is parallel to the axial direction of the rotor;

[0008] In the case where it is detected that the signal characteristics of the voltage signals collected by the induction coils arranged along the first direction do not satisfy the first target voltage signal of the preset first signal characteristic distribution, it is determined that the permanent magnet block corresponding to the first target voltage signal is demagnetized;

[0009] When a second target voltage signal having a signal characteristic not satisfying a preset second signal characteristic distribution is detected in the voltage signals collected by the induction coils arranged along the second direction, it is determined that the permanent magnet block corresponding to the second target voltage signal is demagnetized.

[0010] In one embodiment, the magnetic measurement module includes a sensing panel, the sensing panel includes at least a curved surface, and the sensing coil array is fixed on the curved surface; the first direction is parallel to the circumferential direction of the rotor; the preset first signal characteristic distribution includes an amplitude deviation less than or equal to a preset first deviation threshold;

[0011] In the case where a signal characteristic of a first target voltage signal that does not satisfy a preset first signal characteristic distribution is detected in the voltage signals collected by the induction coils arranged along the first direction, determining that the permanent magnet block corresponding to the first target voltage signal is demagnetized includes:

[0012] The voltage signals are grouped according to the positions of the induction coils in the second direction, and the voltage signals collected by the induction coils at the same positions in the second direction belong to the same group;

[0013] Detecting the average amplitude value of the voltage signal of each group and the amplitude deviation of each voltage signal, where the amplitude deviation is the difference between the amplitude of the voltage signal and the average amplitude value of the voltage signal of the group to which the voltage signal belongs;

[0014] A voltage signal whose amplitude deviation is greater than a preset first deviation threshold is determined as a first target voltage signal, and it is determined that the permanent magnet block corresponding to the first target voltage signal is demagnetized.

[0015] In one of the embodiments, the preset second signal characteristic distribution includes a phase deviation less than or equal to a preset second deviation threshold; in the case where a signal characteristic is detected in the voltage signals collected by each induction coil arranged along the second direction and a second target voltage signal that does not satisfy the preset second signal characteristic distribution is detected, determining that the permanent magnet block corresponding to the second target voltage signal is demagnetized includes:

[0016] The voltage signals are grouped according to the positions of the induction coils in the first direction, and the voltage signals collected by the induction coils at the same positions in the first direction belong to the same group;

[0017] Detecting the phase average of the voltage signal of each group and the phase deviation of each voltage signal, where the phase deviation is the difference between the phase of the voltage signal and the phase average of the voltage signal of the group to which the voltage signal belongs;

[0018] A voltage signal whose phase deviation is greater than a preset second deviation threshold is determined as a second target voltage signal, and it is determined that the permanent magnet block corresponding to the second target voltage signal is demagnetized.

[0019] In one embodiment, the method further comprises:

[0020] Detecting a target induction coil corresponding to a target voltage signal;

[0021] Determine the position information of the demagnetized permanent magnet block in the first direction according to the arrangement position of the target induction coil in the first direction, the initial detection position corresponding to the target induction coil, the detection time of the target voltage signal, the rotation speed of the rotor and the cross-sectional circumference of the rotor;

[0022] Determine the position information of the demagnetized permanent magnet block in the second direction according to the arrangement position of the target induction coil in the second direction;

[0023] The target voltage signal includes at least one of a first target voltage signal and a second target voltage signal, the target induction coil includes at least one of a first target induction coil and a second target induction coil, the first target voltage signal corresponds to the first target induction coil, and the second target voltage signal corresponds to the second target induction coil.

[0024] In one of the embodiments, the size of the induction coil is smaller than the size of the permanent magnet block; the number of induction coils arranged along the second direction is greater than or equal to the number of permanent magnet blocks distributed along the axial direction; the distribution range of the induction coils in the second direction is greater than or equal to the distribution range of the permanent magnet blocks in the axial direction.

[0025] In one of the embodiments, the minimum spacing distance between each induction coil and at least one permanent magnet block is less than or equal to 50 mm.

[0026] In a second aspect, the present application further provides a permanent magnet block demagnetization detection device, which is used to perform demagnetization detection on multiple permanent magnet blocks distributed circumferentially and axially on a rotor, comprising:

[0027] A magnetic measurement module, the magnetic measurement module includes an induction coil array, the induction coil array is formed by arranging the induction coils along a first direction and a second direction, the first direction is parallel to the cross section of the rotor, and the second direction is parallel to the axial direction of the rotor, and the induction coil is used to collect voltage signals of multiple permanent magnet blocks during the rotation of the rotor;

[0028] A first detection module is used to determine that the permanent magnet block corresponding to the first target voltage signal is demagnetized when a signal characteristic does not satisfy a first target voltage signal of a preset first signal characteristic distribution in the voltage signals collected by the induction coils arranged along the first direction;

[0029] The second detection module is used to determine that the permanent magnet block corresponding to the second target voltage signal is demagnetized when a signal characteristic does not satisfy a second target voltage signal of a preset second signal characteristic distribution in the voltage signals collected by the induction coils arranged along the second direction.

[0030] In a third aspect, the present application further provides a computer device for detecting demagnetization of a plurality of permanent magnet blocks distributed circumferentially and axially on a rotor, comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0031] During the rotation of the rotor, the voltage signals of the plurality of permanent magnet blocks are collected through the induction coil array in the magnetic measurement module, wherein the induction coil array is composed of a plurality of induction coils arranged along a first direction and a second direction, the first direction is parallel to the cross section of the rotor, and the second direction is parallel to the axial direction of the rotor;

[0032] In the case where it is detected that the signal characteristics of the voltage signals collected by the induction coils arranged along the first direction do not satisfy the first target voltage signal of the preset first signal characteristic distribution, it is determined that the permanent magnet block corresponding to the first target voltage signal is demagnetized;

[0033] When a second target voltage signal having a signal characteristic not satisfying a preset second signal characteristic distribution is detected in the voltage signals collected by the induction coils arranged along the second direction, it is determined that the permanent magnet block corresponding to the second target voltage signal is demagnetized.

[0034] In a fourth aspect, the present application further provides a computer-readable storage medium, which is used for performing demagnetization detection on a plurality of permanent magnet blocks distributed circumferentially and axially on a rotor, and on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0035] During the rotation of the rotor, the voltage signals of the plurality of permanent magnet blocks are collected through the induction coil array in the magnetic measurement module, wherein the induction coil array is composed of a plurality of induction coils arranged along a first direction and a second direction, the first direction is parallel to the cross section of the rotor, and the second direction is parallel to the axial direction of the rotor;

[0036] In the case where it is detected that the signal characteristics of the voltage signals collected by the induction coils arranged along the first direction do not satisfy the first target voltage signal of the preset first signal characteristic distribution, it is determined that the permanent magnet block corresponding to the first target voltage signal is demagnetized;

[0037] When a second target voltage signal having a signal characteristic not satisfying a preset second signal characteristic distribution is detected in the voltage signals collected by the induction coils arranged along the second direction, it is determined that the permanent magnet block corresponding to the second target voltage signal is demagnetized.

[0038] In a fifth aspect, the present application further provides a computer program product for detecting demagnetization of a plurality of permanent magnet blocks distributed circumferentially and axially on a rotor, comprising a computer program. When the computer program is executed by a processor, the following steps are implemented:

[0039] During the rotation of the rotor, the voltage signals of the plurality of permanent magnet blocks are collected through the induction coil array in the magnetic measurement module, wherein the induction coil array is composed of a plurality of induction coils arranged along a first direction and a second direction, the first direction is parallel to the cross section of the rotor, and the second direction is parallel to the axial direction of the rotor;

[0040] In the case where it is detected that the signal characteristics of the voltage signals collected by the induction coils arranged along the first direction do not satisfy the first target voltage signal of the preset first signal characteristic distribution, it is determined that the permanent magnet block corresponding to the first target voltage signal is demagnetized;

[0041] When a second target voltage signal having a signal characteristic not satisfying a preset second signal characteristic distribution is detected in the voltage signals collected by the induction coils arranged along the second direction, it is determined that the permanent magnet block corresponding to the second target voltage signal is demagnetized.

[0042] The above-mentioned permanent magnet block demagnetization detection method, device, computer equipment, computer-readable storage medium and computer program product are applied to perform demagnetization detection on multiple permanent magnet blocks distributed circumferentially and axially on a rotor. First, during the rotation of the rotor, the voltage signals of the multiple permanent magnet blocks are collected by the induction coil array in the magnetic measurement module, wherein the induction coil array is composed of multiple induction coils arranged along a first direction and a second direction, the first direction is parallel to the cross section of the rotor, and the second direction is parallel to the axial direction of the rotor. When the permanent magnet block is not demagnetized, the signal characteristics of the voltage signal detected by the induction coil in the first direction should conform to the first signal characteristic distribution, and the voltage signal in the second direction should conform to the first signal characteristic distribution. The signal characteristics of the voltage signal detected by the induction coil should conform to the second signal characteristic distribution, wherein the first signal characteristic distribution and the second signal characteristic distribution can be determined according to the test results, etc., and then in the voltage signal collected by each induction coil arranged along the first direction, if the signal characteristic is detected not to meet the first target voltage signal of the preset first signal characteristic distribution, the permanent magnet block corresponding to the first target voltage signal is determined to be demagnetized, and in the voltage signal collected by each induction coil arranged along the second direction, if the signal characteristic is detected not to meet the second target voltage signal of the preset second signal characteristic distribution, the permanent magnet block corresponding to the second target voltage signal is determined to be demagnetized. In this way, it is only necessary to detect whether the signal characteristics of the voltage signal generated by the induction coil under the action of the permanent magnet block conform to the first signal characteristic distribution and the second signal characteristic distribution during the rotation of the rotor, so as to accurately and quickly detect the demagnetized permanent magnet block. Compared with the method of using a Gauss meter or a magnetic pole detection pen to measure the surface magnetism of each magnetic pole one by one, the present application does not need manual measurement, so it can effectively save human resources, and the voltage signal can be collected by rotating the rotor at least one circle, and the comparison of signal rules can also be realized automatically, so it can effectively improve the detection efficiency of the demagnetized permanent magnet block. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A schematic diagram of a flow chart of a method for detecting demagnetization of a permanent magnet block in one embodiment;

[0045] Figure 2 is a schematic structural diagram of a magnetic measurement module in one embodiment;

[0046] Figure 3 A schematic diagram of a flow chart of a method for detecting demagnetization of a permanent magnet block in another embodiment;

[0047] Figure 4 A schematic flow chart of a method for detecting demagnetization of a permanent magnet block in another embodiment;

[0048] Figure 5 It is a structural block diagram of a permanent magnet block demagnetization detection device in one embodiment;

[0049] Figure 6 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0051] The rotor of a permanent magnet wind turbine generator is composed of multiple magnetic poles, and each magnetic pole is formed by assembling multiple permanent magnet blocks. During the actual operation of a permanent magnet wind turbine generator, the rotor is often affected by some equipment conditions or environmental factors, causing some magnetic poles or some permanent magnet blocks on the magnetic poles to fail and lose magnetism, which will undoubtedly have an adverse effect on the power generation efficiency and economic benefits of the permanent magnet wind turbine generator.

[0052] In conventional technology, a Gauss meter or a magnetic pole detection pen is usually used to measure the surface magnetism of the magnetic pole, so as to determine whether the permanent magnet block is demagnetized and the position of the demagnetized permanent magnet block based on the surface magnetism.

[0053] When repairing the rotor of a permanent magnet wind turbine, it is usually necessary to accurately locate the location of the demagnetized permanent magnet blocks, and then replace them with new permanent magnet blocks in a saturated state to ensure the normal operation of the permanent magnet wind turbine. In general, to accurately locate the position of the permanent magnet block, a Gauss meter or a magnetic pole detection pen is used to measure the surface magnetism of the magnetic pole. However, due to the considerable number of magnetic poles, the measurement points can reach thousands. If the method of manual detection and verification is adopted one by one, not only the workload is extremely large, but also because of the differences in the operating techniques of the measurement personnel, the different measurement points, and the temperature at the time of measurement. There are many differences, which makes the results of the surface magnetic measurement have a large uncertainty, and it is difficult to accurately lock the specific location of the faulty permanent magnet block. More often, after the approximate location of the demagnetized permanent magnet block is initially determined, all the permanent magnet blocks near the location are disassembled, and then the magnetic flux of each permanent magnet block is measured to determine whether the permanent magnet block is in a saturated state. In this way, the entire maintenance process is not only time-consuming, but also requires a lot of manpower, and the efficiency is very low.

[0054] In addition, the problem of difficulty in measuring the saturation degree of the rotor poles of permanent magnet wind turbines still exists in the production process. After the rotor poles are assembled, workers can often only determine whether all the poles are saturated through surface magnetic measurement. Whether the rotor poles are truly saturated needs to be reflected in the back-EMF test. The back-EMF test of the permanent magnet wind turbine requires that the stator and rotor are fully assembled. Once the rotor poles are found to be unsaturated in the back-EMF test of the motor, the stator and rotor of the permanent magnet wind turbine need to be disassembled and the unsaturated poles need to be replaced. Repeated disassembly and assembly lead to a complicated rotor production process and low production efficiency.

[0055] Based on this, in an exemplary embodiment, Figure 1 As shown, a method for detecting demagnetization of a permanent magnet block is provided. This embodiment takes the method applied to a terminal as an example, wherein the terminal may be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, Internet of Things devices and portable wearable devices, and the Internet of Things devices may be smart speakers, smart TVs, smart air conditioners, smart car-mounted devices, projection devices, etc. Portable wearable devices may be smart watches, smart bracelets, head-mounted devices, etc. The head-mounted devices may be virtual reality (VR) devices, augmented reality (AR) devices, smart glasses, etc. It can be understood that the method may also be applied to servers, and may also be applied to systems including terminals and servers, and may be implemented through the interaction between the terminals and servers. In this embodiment, the method includes the following steps S10-S30. Among them:

[0056] Step S10, during the rotation of the rotor, voltage signals of multiple permanent magnet blocks are collected through the induction coil array in the magnetic measurement module, wherein the induction coil array is composed of multiple induction coils arranged along a first direction and a second direction, the first direction is parallel to the cross section of the rotor, and the second direction is parallel to the axial direction of the rotor.

[0057] Among them, the magnetic measurement module may refer to a device for collecting voltage signals generated by changes in magnetic fields. The magnetic measurement module includes at least an induction coil array and may also include an induction panel, which may refer to a substrate for fixing the induction coil. The magnetic measurement module may also include at least one of a rotating module and a base. The rotating module may refer to a device capable of driving the rotor to rotate. During the detection process, the rotor may rotate under the drive of the rotating module or under the drive of other devices. The base may refer to a structure capable of fixing the induction panel and the rotating module.

[0058] The sensing panel should at least be made of insulating material, which can effectively isolate the electrical connections between different coils and between the coils and surrounding metal parts to avoid short circuits. The sensing panel can also be made of materials with good high voltage resistance, mechanical stability and heat dissipation. As an example, the sensing panel can be made of epoxy resin.

[0059] The induction coil array is formed by arranging a plurality of induction coils along a first direction and a second direction, wherein the first direction is parallel to the cross section of the rotor, and the second direction is parallel to the axial direction of the rotor. In this way, each permanent magnet block can correspond to one or more induction coils by rotating. When the rotor rotates at a constant speed, the permanent magnet block can periodically approach and move away from at least one induction coil, thereby causing a periodic change in the magnetic flux passing through the induction coil. Whenever the permanent magnet block approaches a certain induction coil, the magnetic flux increases, and when the permanent magnet block moves away from the induction coil, the magnetic flux decreases. This change in magnetic flux can generate an induced voltage in the permanent magnet block. In this way, if the permanent magnet block is not demagnetized, during the rotation of the rotor, the signal characteristics of the voltage signals collected by each induction coil arranged along the first direction should have a similar first signal characteristic distribution, wherein the signal characteristics may include at least one of amplitude, phase, etc., and the first signal characteristic distribution may include at least one of the same amplitude, amplitude changing in a smooth curve, and phase changing in a smooth curve, etc., which may be specifically determined based on test results, etc., and this embodiment is not limited to this. The signal characteristics of the voltage signals collected by each induction coil arranged along the second direction should have a similar second signal characteristic distribution, wherein the signal characteristics may include at least one of amplitude, phase, etc., and the second signal characteristic distribution may include at least one of the same phase, the phase changing in a smooth curve, and the amplitude changing in a smooth curve, etc., which can be specifically determined based on test results, etc., and this embodiment is not limited to this.

[0060] In some possible implementations, such as Figure 2 As shown, the magnetic measurement module includes a sensing panel 202, a base 204 and a rotating module 206. The rotating module is horizontally arranged on the base. The rotating module is used to install a rotor 208 and drive the rotor 208 to rotate horizontally. A plurality of permanent magnets are arranged on the surface of the rotor 208 along the circumferential and axial directions. A sensing panel mounting bracket 210 is vertically arranged on the side of the base. The sensing panel 202 is fixed on the sensing panel mounting bracket 210. The induction coil is arranged on the sensing panel 202 and corresponds to the permanent magnets on the surface of the rotor 208. In some feasible implementations, the sensing panel 202 is an arc surface, and the curvature of the sensing panel is the same as the curvature of the side surface of the rotor, so that the position change between each induction coil on the sensing panel and its corresponding permanent magnet block is the same, so that the amplitudes of the induced voltages collected by the induction coils in the same horizontal direction are the same but the phases are different, while the phases of the induced voltages collected by the induction coils in the same vertical direction are the same but the amplitudes are different, so that if the amplitude of the induced voltage collected by a certain induction coil is different from the amplitudes of the induced voltages collected by other induction coils in the same horizontal direction, or is different from the phases of the induced voltages collected by other induction coils in the same vertical direction, it indicates that the permanent magnet block corresponding to the induction coil is demagnetized, so that the demagnetized permanent magnet block can be detected more intuitively and quickly.

[0061] In some feasible embodiments, the induction coil can be arranged on a flexible circuit board, the flexible circuit board can be attached to the curved surface of the induction panel, and permanent magnet rotors with different numbers of poles are provided on rotors with different radii. The flexible circuit board can be compatible with rotors with different radii. To ensure that the distance between the detection coil and its corresponding magnetic pole is equal, it is only necessary to change the position or curvature of the induction panel to which the flexible circuit board is attached, without changing the circuit topology and electronic components.

[0062] In some feasible embodiments, the size of the induction coil is smaller than the size of the permanent magnet block; the number of induction coils arranged along the second direction is greater than or equal to the number of permanent magnet blocks distributed along the axial direction; the distribution range of the induction coils in the second direction is greater than or equal to the distribution range of the permanent magnet blocks in the axial direction.

[0063] Among them, the size of the induction coil is usually smaller than the size of the permanent magnet block. If the number of induction coils arranged along the second direction is smaller than the number of permanent magnet blocks distributed along the axial direction, in order to ensure the effective detection of all permanent magnet blocks on the rotor and achieve accurate positioning of the demagnetized permanent magnet blocks, it is also necessary to control the induction panel to move along the second direction. Not only is it necessary to add a displacement control device to the magnetic measurement module, but the duration of each detection will also increase exponentially, affecting the detection efficiency. By arranging more induction coils along the second direction than the number of permanent magnet blocks distributed along the axial direction, and making the distribution range of the induction coils in the second direction greater than or equal to the distribution range of the permanent magnet blocks in the axial direction, the steps of moving the induction panel along the second direction can be reduced on the basis of ensuring the comprehensiveness and accuracy of the permanent magnet block demagnetization detection, thereby improving the detection efficiency.

[0064] In some feasible implementations, the minimum spacing distance between each induction coil and at least one permanent magnet block is less than or equal to 50 mm.

[0065] During the rotation of the rotor, for each permanent magnet block and the induction coil closest to the permanent magnet block, the permanent magnet block will first gradually approach the induction coil and then move away from the induction coil. At the moment when it is closest to the induction coil, the spacing distance between the permanent magnet block and the induction coil is the minimum spacing distance. When the distance between the permanent magnet block and the induction coil increases, the magnetic flux density will rapidly decrease. If the minimum spacing distance is too large, exceeding 50mm, when the permanent magnet block is closest to the induction coil, the magnetic flux density will be very weak or even undetectable, which will cause the induced voltage to be very weak or even undetectable, and the permanent magnet block demagnetization detection cannot be completed.

[0066] In some feasible embodiments, the position of at least one of the rotor and the sensing panel is adjustable, so as to be compatible with the testing requirements of rotors of different sizes.

[0067] Exemplarily, before performing the permanent magnet block demagnetization detection, the rotor can be installed to a specified position manually, by a manipulator or by a robot, such as on a rotating module of a magnetic measurement module, on a base of a magnetic measurement module, or at a position corresponding to a sensing panel, etc. The specific position can be determined based on actual conditions, and this embodiment does not impose any restrictions on this. Then, the rotor is controlled to rotate around the axis. During the rotation of the rotor around the axis, the voltage signal of the permanent magnet block corresponding to each induction coil is collected through the induction coil in the magnetic measurement module.

[0068] Step S20: when it is detected that the signal characteristics of the voltage signals collected by the induction coils arranged along the first direction do not satisfy the first target voltage signal of the preset first signal characteristic distribution, it is determined that the permanent magnet block corresponding to the first target voltage signal is demagnetized.

[0069] Exemplarily, the voltage signals collected by each induction coil can be grouped according to the arrangement position of the induction coil in the second direction. For example, if the induction coils are arranged in a matrix of n rows and m columns, the collected voltage signals can be grouped according to the row where the induction coils are located, and those belonging to the same row are grouped into the same row arrangement group. Then, it is detected whether the signal characteristics of the voltage signals in each row arrangement group meet the preset first signal characteristic distribution; if it is detected that the signal characteristics of each voltage signal in each row arrangement group meet the preset first signal characteristic distribution, it means that the rotor currently detected has not been demagnetized in the first direction; if at least one signal characteristic of the first target voltage signal that does not meet the preset first signal characteristic distribution is detected from at least one row arrangement group, it is determined that the permanent magnet block corresponding to the first target voltage signal is demagnetized, and the demagnetized permanent magnet block can be further located according to the relevant information of the first target voltage signal.

[0070] Step S30: when a second target voltage signal having a signal characteristic not satisfying a preset second signal characteristic distribution is detected in the voltage signals collected by the induction coils arranged along the second direction, it is determined that the permanent magnet block corresponding to the second target voltage signal is demagnetized.

[0071] Exemplarily, the voltage signals collected by each induction coil can be grouped according to the arrangement position of the induction coil in the first direction. For example, if the induction coils are arranged in a matrix of n rows and m columns, the collected voltage signals can be grouped according to the columns in which the induction coils are located, and those belonging to the same column are grouped into the same column arrangement group. Then, it is detected whether the signal characteristics of the voltage signals in each column arrangement group meet the preset second signal characteristic distribution; if it is detected that the signal characteristics of each voltage signal in each column arrangement group meet the preset second signal characteristic distribution, it means that the rotor currently detected has not been demagnetized in the second direction; if at least one second target voltage signal whose signal characteristics do not meet the preset second signal characteristic distribution is detected from at least one column arrangement group, it is determined that the permanent magnet block corresponding to the second target voltage signal is demagnetized, and the demagnetized permanent magnet block can be further located according to the relevant information of the second target voltage signal.

[0072] It is understandable that the numerical sequence of step S20 and step S30 does not represent the order of execution of the steps, that is, step S20 may be executed first and then step S30, or step S30 may be executed first and then step S20, or they may be executed simultaneously, and this embodiment does not impose any limitation on this.

[0073] The above-mentioned permanent magnet block demagnetization detection method is applied to perform demagnetization detection on multiple permanent magnet blocks distributed along the circumferential direction and the axial direction on the rotor. First, during the rotation of the rotor, the voltage signals of the multiple permanent magnet blocks are collected by the induction coil array in the magnetic measurement module, wherein the induction coil array is composed of multiple induction coils arranged along a first direction and a second direction, the first direction is parallel to the cross section of the rotor, and the second direction is parallel to the axial direction of the rotor. When the permanent magnet block is not demagnetized, the signal characteristics of the voltage signal detected by the induction coil in the first direction should conform to the first signal characteristic distribution, and the signal characteristics of the voltage signal detected by the induction coil in the second direction should conform to the second signal characteristic distribution, wherein the first signal characteristic distribution and the second signal characteristic distribution can be determined according to test results, etc., and then, in the case where the signal characteristics of the first target voltage signal that does not meet the preset first signal characteristic distribution is detected in the voltage signals collected by the various induction coils arranged along the first direction, it is determined that the permanent magnet block corresponding to the first target voltage signal is demagnetized, and in the case where the signal characteristics of the second target voltage signal that does not meet the preset second signal characteristic distribution is detected in the voltage signals collected by the various induction coils arranged along the second direction, it is determined that the permanent magnet block corresponding to the second target voltage signal is demagnetized. In this way, it is only necessary to detect whether the signal characteristics of the voltage signal generated by the induction coil under the action of the permanent magnet block conform to the first signal characteristic distribution and the second signal characteristic distribution during the rotation of the rotor, so as to accurately and quickly detect the demagnetized permanent magnet block. Compared with the method of using a Gaussmeter or a magnetic pole detection pen to measure the surface magnetism of each magnetic pole one by one, the present application does not require manual measurement, so it can effectively save human resources, and the voltage signal can be collected when the rotor rotates at least one circle, and the comparison of signal patterns can also be realized automatically, so the detection efficiency of demagnetized permanent magnet blocks can be effectively improved.

[0074] In an exemplary embodiment, the induction panel includes at least an arc surface, and the induction coil array is fixed on the arc surface; the first direction is parallel to the circumference of the rotor; the preset first signal characteristic distribution includes an amplitude deviation less than or equal to a preset first deviation threshold; in the voltage signal collected by each induction coil arranged along the first direction, when it is detected that the signal characteristic does not meet the first target voltage signal of the preset first signal characteristic distribution, it is determined that the permanent magnet block corresponding to the first target voltage signal is demagnetized, including steps S21 to S23. Wherein:

[0075] Step S21, grouping the voltage signals according to the positions of the induction coils in the second direction, and the voltage signals collected by the induction coils at the same positions in the second direction belong to the same group.

[0076] Among them, at least one surface of the induction panel is an arc surface, the induction coil array is fixed on the arc surface, and the first direction is parallel to the circumference of the rotor, so that the distance between each induction coil and the permanent magnet block at a relative position on the rotor is equal. In this way, when the permanent magnet block is not demagnetized, the amplitude of the induced voltage collected by the induction coils with the same arrangement position in the second direction should be equal or similar, that is, the amplitude deviation should be less than or equal to the preset first deviation threshold.

[0077] Exemplarily, the voltage signals collected by each induction coil can be grouped according to the arrangement position of the induction coil in the second direction. For example, if the induction coils are arranged in a matrix with n rows and m columns, the collected voltage signals can be grouped according to the rows where the induction coils are located, and those belonging to the same row are grouped into the same group.

[0078] Step S22, detecting the average amplitude value of the voltage signal of each group and the amplitude deviation of each voltage signal, where the amplitude deviation is the difference between the amplitude of the voltage signal and the average amplitude value of the voltage signal of the group to which the voltage signal belongs.

[0079] The amplitude deviation may refer to the difference between the amplitude of each voltage signal and the average value of the amplitudes of all voltage signals in the group to which the voltage signal belongs.

[0080] Exemplarily, after the voltage signals are grouped, the average amplitude value of the voltage signals in each group is calculated respectively according to the amplitude of the voltage signals in each group, and then the difference between the amplitude of each voltage signal and the average amplitude value of the voltage signals of the group to which the voltage signal belongs is calculated to obtain the amplitude deviation of each voltage signal, and then the numerical size relationship between the amplitude deviation of each voltage signal and a preset first deviation threshold is compared.

[0081] Step S23, determining the voltage signal whose amplitude deviation is greater than the preset first deviation threshold as the first target voltage signal, and determining that the permanent magnet block corresponding to the first target voltage signal is demagnetized.

[0082] Exemplarily, if a voltage signal with an amplitude deviation greater than a preset first deviation threshold is detected, the voltage signal is determined to be a first target voltage signal, and the permanent magnet block corresponding to the first target voltage signal is judged to be demagnetized. The demagnetized permanent magnet block can be further located based on relevant information of the first target voltage signal.

[0083] In this embodiment, by fixing the induction coil on the arc surface so that the first direction is parallel to the circumferential direction of the rotor, the preset first signal characteristic distribution can be simplified. Only by detecting the amplitude of the voltage signal, the demagnetized permanent magnet block can be accurately detected. On the other hand, the method of performing demagnetization detection through amplitude deviation has a simple algorithm and higher detection efficiency.

[0084] In an exemplary embodiment, the preset second signal characteristic distribution includes a phase deviation less than or equal to a preset second deviation threshold; in the voltage signals collected by the induction coils arranged along the second direction, when the signal characteristics are detected not satisfying the second target voltage signal of the preset second signal characteristic distribution, it is determined that the permanent magnet block corresponding to the second target voltage signal is demagnetized, including steps S31 to S33. Wherein:

[0085] Step S31, grouping the voltage signals according to the positions of the induction coils in the first direction, and the voltage signals collected by the induction coils at the same positions in the first direction belong to the same group.

[0086] The second direction is parallel to the axial direction of the rotor. Thus, when the permanent magnet block is not demagnetized, the phases of the induced voltages collected by the induction coils arranged at the same position in the first direction should be equal or similar, that is, the phase deviation should be less than or equal to the preset second deviation threshold.

[0087] Exemplarily, the voltage signals collected by each induction coil can be grouped according to the arrangement position of the induction coil in the first direction. For example, if the induction coils are arranged in a matrix with n rows and m columns, the collected voltage signals can be grouped according to the columns where the induction coils are located, and those belonging to the same column are grouped into the same group.

[0088] Step S32, detecting the phase average value of the voltage signal of each group and the phase deviation of each voltage signal, where the phase deviation is the difference between the phase of the voltage signal and the phase average value of the voltage signal of the group to which the voltage signal belongs.

[0089] The phase deviation may refer to the difference between the phase of each voltage signal and the average value of the phases of all voltage signals in the group to which the voltage signal belongs.

[0090] Exemplarily, after the voltage signals are grouped, the average phase value of the voltage signals of each group is calculated according to the phases of the voltage signals in each group, and then the difference between the phase of each voltage signal and the average phase value of the voltage signals of the group to which the voltage signal belongs is calculated to obtain the phase deviation of each voltage signal, and then the numerical size relationship between the phase deviation of each voltage signal and a preset second deviation threshold is compared.

[0091] Step S33: determine the voltage signal whose phase deviation is greater than the preset second deviation threshold as the second target voltage signal, and determine that the permanent magnet block corresponding to the second target voltage signal is demagnetized.

[0092] Exemplarily, if a voltage signal with a phase deviation greater than a preset second deviation threshold is detected, the voltage signal is determined to be a second target voltage signal, and the permanent magnet block corresponding to the second target voltage signal is judged to be demagnetized. The demagnetized permanent magnet block can be further located based on relevant information of the second target voltage signal.

[0093] In this embodiment, the method of performing demagnetization detection through phase deviation has a simple algorithm and higher detection efficiency.

[0094] In an exemplary embodiment, the method further comprises:

[0095] Detecting a target induction coil corresponding to a target voltage signal;

[0096] Determine the position information of the demagnetized permanent magnet block in the first direction according to the arrangement position of the target induction coil in the first direction, the initial detection position corresponding to the target induction coil, the detection time of the target voltage signal, the rotation speed of the rotor and the cross-sectional circumference of the rotor;

[0097] Determine the position information of the demagnetized permanent magnet block in the second direction according to the arrangement position of the target induction coil in the second direction;

[0098] The target voltage signal includes at least one of a first target voltage signal and a second target voltage signal, the target induction coil includes at least one of a first target induction coil and a second target induction coil, the first target voltage signal corresponds to the first target induction coil, and the second target voltage signal corresponds to the second target induction coil.

[0099] As an example, Figure 3 As shown, after determining that the permanent magnet block corresponding to the first target voltage signal is demagnetized, it also includes steps S24 to S26. Among them:

[0100] Step S24, detecting a first target induction coil corresponding to the first target voltage signal.

[0101] It should be noted that in the related art, if it is necessary to locate the demagnetized permanent magnet block, it is usually necessary to detect each permanent magnet block one by one in sequence, which is inefficient.

[0102] Exemplarily, after determining that there is a demagnetized permanent magnet block on the rotor, the demagnetized permanent magnet block can be further located. First, the first target induction coil that collects the first target voltage signal can be found from the signal information of the first target voltage signal.

[0103] Step S25, determining the position information of the demagnetized permanent magnet block in the first direction according to the arrangement position of the first target induction coil in the first direction, the initial detection position corresponding to the first target induction coil, the detection time of the first target voltage signal, the rotation speed of the rotor and the cross-sectional circumference of the rotor.

[0104] The initial detection position corresponding to the first target induction coil may refer to the position of the permanent magnet block that is closest to the first target induction coil at the start time of detection.

[0105] Exemplarily, after determining the first target induction coil, all voltage signals collected by the first target induction coil can be extracted, and all voltage signals collected by the first target induction coil can be sorted in order of collection time, so as to determine the target time corresponding to the first target voltage signal at which the signal characteristic does not satisfy the preset first signal characteristic distribution; synchronously, the initial detection position corresponding to the first target induction coil, the rotation speed of the rotor and the circumference of the rotor can also be determined. According to the initial detection position corresponding to the first target induction coil, the rotation speed of the rotor and the circumference of the rotor, the detection position corresponding to the first target induction coil at different times in the entire detection cycle can be calculated, so as to determine the position information of the permanent magnet block closest to it in the first direction.

[0106] Step S26, determining the position information of the demagnetized permanent magnet block in the second direction according to the arrangement position of the first target induction coil in the second direction.

[0107] Exemplarily, after determining the first target induction coil, the position information of the demagnetized permanent magnet block in the second direction may be determined according to the arrangement position of the first target induction coil in the second direction and the relative position relationship between the induction coil and the permanent magnet block.

[0108] It can be understood that the numerical sequence of step S25 and step S26 does not represent the order of execution of the steps, that is, step S25 can be executed first and then step S26, or step S26 can be executed first and then step S25, or they can be executed simultaneously. This embodiment is not limited to this. After determining the position information of the demagnetized permanent magnet block in the first direction and the second direction, the demagnetized permanent magnet block can be accurately located.

[0109] As an example, Figure 4 As shown, after determining that the permanent magnet block corresponding to the second target voltage signal is demagnetized, it also includes steps S34 to S36. Among them:

[0110] Step S34, detecting a second target induction coil corresponding to the second target voltage signal.

[0111] Exemplarily, after determining that there is a demagnetized permanent magnet block on the rotor, the demagnetized permanent magnet block can be further located. First, the second target induction coil that collects the second target voltage signal can be found from the signal information of the second target voltage signal.

[0112] Step S35, determining the position information of the demagnetized permanent magnet block in the first direction according to the arrangement position of the second target induction coil in the first direction, the initial detection position corresponding to the second target induction coil, the detection time of the second target voltage signal, the rotation speed of the rotor and the cross-sectional circumference of the rotor.

[0113] The initial detection position corresponding to the second target induction coil may refer to the position of the permanent magnet block that is closest to the second target induction coil at the start of detection.

[0114] Exemplarily, after determining the second target induction coil, all voltage signals collected by the second target induction coil can be extracted, and all voltage signals collected by the second target induction coil can be sorted in order of collection time, so as to determine the target time corresponding to the second target voltage signal at which the signal characteristic does not satisfy the preset second signal characteristic distribution; synchronously, the initial detection position corresponding to the second target induction coil, the rotation speed of the rotor and the circumference of the rotor can also be determined, and according to the initial detection position corresponding to the second target induction coil, the rotation speed of the rotor and the circumference of the rotor, the detection position corresponding to the second target induction coil at different times in the entire detection cycle can be calculated, so as to determine the position information of the permanent magnet block closest to it in the first direction.

[0115] Step S36, determining the position information of the demagnetized permanent magnet block in the second direction according to the arrangement position of the second target induction coil in the second direction.

[0116] Exemplarily, after determining the second target induction coil, the position information of the demagnetized permanent magnet block in the second direction may be determined according to the arrangement position of the second target induction coil in the second direction and the relative position relationship between the induction coil and the permanent magnet block.

[0117] It can be understood that the numerical sequence of step S35 and step S36 does not represent the order of execution of the steps, that is, step S35 can be executed first and then step S36, or step S36 can be executed first and then step S35, or they can be executed simultaneously. This embodiment is not limited to this. After determining the position information of the demagnetized permanent magnet block in the first direction and the second direction, the demagnetized permanent magnet block can be accurately located.

[0118] In this embodiment, by measuring the magnetism of a large area, the demagnetized permanent magnet block can be accurately positioned on the basis of improving the magnetic detection efficiency, and this method can play an important role in the production process and operation and maintenance process of the permanent magnet wind turbine rotor.

[0119] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0120] Based on the same inventive concept, the embodiment of the present application also provides a permanent magnet block demagnetization detection device for implementing the permanent magnet block demagnetization detection method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more permanent magnet block demagnetization detection device embodiments provided below can refer to the limitations of the permanent magnet block demagnetization detection method above, and will not be repeated here.

[0121] In an exemplary embodiment, Figure 5 As shown, a permanent magnet block demagnetization detection device is provided, which is used to detect demagnetization of multiple permanent magnet blocks distributed circumferentially and axially on a rotor, including: a magnetic measurement module 502, a first detection module 504 and a second detection module 506, wherein:

[0122] A magnetic measurement module 502, the magnetic measurement module includes an induction coil array, the induction coil array is formed by arranging the induction coils along a first direction and a second direction, the first direction is parallel to the cross section of the rotor, and the second direction is parallel to the axial direction of the rotor, and the induction coil is used to collect voltage signals of multiple permanent magnet blocks during the rotation of the rotor;

[0123] The first detection module 504 is used to determine that the permanent magnet block corresponding to the first target voltage signal is demagnetized when a signal characteristic does not satisfy a first target voltage signal of a preset first signal characteristic distribution in the voltage signals collected by the induction coils arranged along the first direction;

[0124] The second detection module 506 is used to determine that the permanent magnet block corresponding to the second target voltage signal is demagnetized when a signal characteristic does not satisfy a second target voltage signal of a preset second signal characteristic distribution in the voltage signals collected by the induction coils arranged along the second direction.

[0125] In an exemplary embodiment, the magnetic measurement module includes a sensing panel, the sensing panel includes at least a curved surface, and the induction coil array is fixed on the curved surface; the first direction is parallel to the circumferential direction of the rotor; the preset first signal characteristic distribution includes an amplitude deviation less than or equal to a preset first deviation threshold; the first detection module 504 is further used to:

[0126] The voltage signals are grouped according to the positions of the induction coils in the second direction, and the voltage signals collected by the induction coils at the same positions in the second direction belong to the same group;

[0127] Detecting the average amplitude value of the voltage signal of each group and the amplitude deviation of each voltage signal, where the amplitude deviation is the difference between the amplitude of the voltage signal and the average amplitude value of the voltage signal of the group to which the voltage signal belongs;

[0128] A voltage signal whose amplitude deviation is greater than a preset first deviation threshold is determined as a first target voltage signal, and it is determined that the permanent magnet block corresponding to the first target voltage signal is demagnetized.

[0129] In an exemplary embodiment, the preset second signal characteristic distribution includes a phase deviation less than or equal to a preset second deviation threshold; the second detection module 506 is further used to:

[0130] The voltage signals are grouped according to the positions of the induction coils in the first direction, and the voltage signals collected by the induction coils at the same positions in the first direction belong to the same group;

[0131] Detecting the phase average of the voltage signal of each group and the phase deviation of each voltage signal, where the phase deviation is the difference between the phase of the voltage signal and the phase average of the voltage signal of the group to which the voltage signal belongs;

[0132] A voltage signal whose phase deviation is greater than a preset second deviation threshold is determined as a second target voltage signal, and it is determined that the permanent magnet block corresponding to the second target voltage signal is demagnetized.

[0133] In an exemplary embodiment, the permanent magnet block demagnetization detection device further includes a positioning module, and the positioning module is used to:

[0134] Detecting a target induction coil corresponding to a target voltage signal;

[0135] Determine the position information of the demagnetized permanent magnet block in the first direction according to the arrangement position of the target induction coil in the first direction, the initial detection position corresponding to the target induction coil, the detection time of the target voltage signal, the rotation speed of the rotor and the cross-sectional circumference of the rotor;

[0136] Determine the position information of the demagnetized permanent magnet block in the second direction according to the arrangement position of the target induction coil in the second direction;

[0137] The target voltage signal includes at least one of a first target voltage signal and a second target voltage signal, the target induction coil includes at least one of a first target induction coil and a second target induction coil, the first target voltage signal corresponds to the first target induction coil, and the second target voltage signal corresponds to the second target induction coil.

[0138] In an exemplary embodiment, the size of the induction coil is smaller than the size of the permanent magnet block; the number of induction coils arranged along the second direction is greater than or equal to the number of permanent magnet blocks distributed along the axial direction; the distribution range of the induction coils in the second direction is greater than or equal to the distribution range of the permanent magnet blocks in the axial direction.

[0139] In an exemplary embodiment, a minimum spacing distance between each induction coil and at least one permanent magnet block is less than or equal to 50 mm.

[0140] Each module in the above permanent magnet block demagnetization detection device can be implemented in whole or in part by software, hardware and a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0141] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 6As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC) or other technologies. When the computer program is executed by the processor, a method for detecting demagnetization of a permanent magnet block is implemented. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0142] Those skilled in the art will understand that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0143] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0144] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0145] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0146] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0147] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0148] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0149] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for detecting demagnetization of a permanent magnet block, characterized in that: The method is applied to detect demagnetization of multiple permanent magnet blocks distributed circumferentially and axially on a rotor, and comprises: During the rotation of the rotor, voltage signals of multiple permanent magnet blocks are collected through an induction coil array in a magnetic measurement module, wherein the induction coil array is composed of multiple induction coils arranged along a first direction and a second direction, the first direction is parallel to the cross section of the rotor, and the second direction is parallel to the axial direction of the rotor; In the case where a signal characteristic of a first target voltage signal that does not satisfy a preset first signal characteristic distribution is detected in the voltage signals collected by the induction coils arranged along the first direction, it is determined that the permanent magnet block corresponding to the first target voltage signal is demagnetized; When a second target voltage signal having a signal characteristic not satisfying a preset second signal characteristic distribution is detected in the voltage signals collected by the induction coils arranged along the second direction, it is determined that the permanent magnet block corresponding to the second target voltage signal is demagnetized.

2. The method according to claim 1, characterized in that The magnetic measurement module includes a sensing panel, the sensing panel includes at least a curved surface, and the sensing coil array is fixed on the curved surface; the first direction is parallel to the circumferential direction of the rotor; the preset first signal characteristic distribution includes an amplitude deviation less than or equal to a preset first deviation threshold; In the case where, in the voltage signals collected by the induction coils arranged along the first direction, a first target voltage signal whose signal characteristics do not satisfy a preset first signal characteristic distribution is detected, determining that the permanent magnet block corresponding to the first target voltage signal is demagnetized includes: The voltage signals are grouped according to the positions of the induction coils in the second direction, and the voltage signals collected by the induction coils at the same positions in the second direction belong to the same group; Detecting an average value of the voltage signal amplitude of each group and an amplitude deviation of each of the voltage signals, wherein the amplitude deviation is a difference between the amplitude of the voltage signal and the average value of the voltage signal amplitude of the group to which the voltage signal belongs; A voltage signal whose amplitude deviation is greater than a preset first deviation threshold is determined as a first target voltage signal, and it is determined that the permanent magnet block corresponding to the first target voltage signal is demagnetized.

3. The method according to claim 1, characterized in that The preset second signal characteristic distribution includes a phase deviation that is less than or equal to a preset second deviation threshold; in the case where a signal characteristic is detected in the voltage signals collected by the respective induction coils arranged along the second direction and a second target voltage signal that does not satisfy the preset second signal characteristic distribution, it is determined that the permanent magnet block corresponding to the second target voltage signal is demagnetized, including: The voltage signals are grouped according to the positions of the induction coils in the first direction, and the voltage signals collected by the induction coils at the same positions in the first direction belong to the same group; Detecting a phase average value of a voltage signal of each group and a phase deviation of each voltage signal, wherein the phase deviation is a difference between a phase of the voltage signal and a phase average value of the voltage signal of the group to which the voltage signal belongs; A voltage signal whose phase deviation is greater than a preset second deviation threshold is determined as a second target voltage signal, and it is determined that the permanent magnet block corresponding to the second target voltage signal is demagnetized.

4. The method according to claim 1, characterized in that: The method further comprises: Detecting a target induction coil corresponding to a target voltage signal; Determine the position information of the demagnetized permanent magnet block in the first direction according to the arrangement position of the target induction coil in the first direction, the initial detection position corresponding to the target induction coil, the detection time of the target voltage signal, the rotation speed of the rotor and the cross-sectional circumference of the rotor; Determining position information of the demagnetized permanent magnet block in the second direction according to the arrangement position of the target induction coil in the second direction; The target voltage signal includes at least one of a first target voltage signal and a second target voltage signal, the target induction coil includes at least one of a first target induction coil and a second target induction coil, the first target voltage signal corresponds to the first target induction coil, and the second target voltage signal corresponds to the second target induction coil.

5. The method according to any one of claims 1 to 4, characterized in that: The size of the induction coil is smaller than the size of the permanent magnet block; the number of the induction coils arranged along the second direction is greater than or equal to the number of the permanent magnet blocks distributed along the axial direction; the distribution range of the induction coils in the second direction is greater than or equal to the distribution range of the permanent magnet blocks in the axial direction.

6. The method according to any one of claims 1 to 4, characterized in that: The minimum spacing distance between each of the induction coils and at least one of the permanent magnet blocks is less than or equal to 50 mm.

7. A permanent magnet block demagnetization detection device, characterized in that: The device is used for detecting demagnetization of multiple permanent magnet blocks distributed circumferentially and axially on a rotor, and comprises: A magnetic measurement module, the magnetic measurement module comprising an induction coil array, the induction coil array being formed by arranging the induction coils along a first direction and a second direction, the first direction being parallel to a cross section of the rotor, the second direction being parallel to an axial direction of the rotor, the induction coil being used to collect voltage signals of a plurality of permanent magnet blocks during the rotation of the rotor; A first detection module is used to determine that the permanent magnet block corresponding to the first target voltage signal is demagnetized when a signal characteristic does not satisfy a first target voltage signal of a preset first signal characteristic distribution in the voltage signals collected by the induction coils arranged along the first direction; The second detection module is used to determine that the permanent magnet block corresponding to the second target voltage signal is demagnetized when a signal characteristic does not satisfy a second target voltage signal of a preset second signal characteristic distribution in the voltage signals collected by the induction coils arranged along the second direction.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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