A method for detecting the performance of motor winding insulation materials based on micro-deformation analysis

Abstract

The present invention relates to a method for detecting the performance of motor winding insulation materials based on micro-deformation analysis, comprising the following steps: fixing a group of laser detectors inside a target motor; emitting two laser beams through the laser detectors to act on the surface of the motor winding insulation material, and obtaining and storing reflected light signals of the two laser beams; in continuous time periods, calculating the deformation factor of the surface of the motor winding insulation material at each time node through the two reflected light signals, and judging whether the performance of the motor winding insulation material is normal based on the change in the deformation factor.

Description

Technical Field

[0001] The invention relates to a method for detecting the performance of motor winding insulation materials based on micro-deformation analysis, and belongs to the technical field of insulation performance detection. Background Art

[0002] Large generator sets are the foundation of national economic development, and their safe and reliable operation is a crucial guarantee for stable economic growth. A serious generator failure can lead to equipment damage, power outages, and significant economic losses. Extensive statistical data on generator set failures indicates that insulation damage is the primary cause of generator failures. The composite insulation material of generator stator windings is susceptible to severe electrical, thermal, and mechanical stresses, as well as various environmental factors, during long-term operation. This accelerates the aging and deterioration of the insulation material, severely impacting the safe and reliable operation of the motor. Therefore, systematic testing of the insulation aging performance of generator stator windings and research into its aging patterns are essential.

[0003] Existing analysis technologies mainly use destructive methods for sampling and analysis, or monitor changes in motor output characteristics to obtain changes in the comprehensive performance of various parts of the motor. These methods either have a test time lag and cannot achieve synchronous in-situ analysis, or use indirect testing methods and cannot accurately determine the true condition of damaged components inside the motor. Summary of the Invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the present invention proposes a method for detecting the performance of motor winding insulation materials based on micro-deformation analysis. The changes in the operating conditions of the current motor stator winding insulation materials are comprehensively investigated. It is found that all changes in the microstructure will cause changes in the surface shape of the insulation material after accumulation over a certain period of time. Based on the investigation and analysis of the feasibility of various testing technologies, a method for detecting the performance of motor winding insulation materials based on micro-deformation analysis is proposed. By acting on the specific surface of the material with a high-precision dual-beam laser, the purpose of accurately monitoring the micro-deformation of the material is achieved.

[0005] The technical solutions of the present invention are as follows:

[0006] In one aspect, the present invention provides a method for detecting the performance of motor winding insulation materials based on micro-deformation analysis, comprising the following steps:

[0007] A set of laser detectors is fixed inside the target motor;

[0008] The laser detector emits two laser beams to act on the surface of the motor winding insulation material, and obtains and saves the reflected light signals of the two laser beams;

[0009] In continuous time periods, the deformation factor of the surface of the motor winding insulation material at each time node is calculated through two beams of reflected light signals, and whether the performance of the motor winding insulation material is normal is judged based on the change of the deformation factor.

[0010] As a preferred embodiment, the following steps are also included:

[0011] After fixing the laser detector, the surface of the insulating material within the action range of the laser emitted by the laser detector is polished to ensure that the flatness of the corresponding surface is ≤2μm / cm2 and the reflectivity of the laser is greater than 50%.

[0012] As a preferred embodiment, the following steps are also included:

[0013] Adjust the angles of the two laser beams emitted by the laser detector, where the first laser beam is perpendicular to the surface of the motor winding insulation material, and adjust the angle β between the second laser beam and the first laser beam.

[0014] As a preferred embodiment, the step of calculating the deformation factor of the surface of the motor winding insulation material at each time node using the two reflected light signals is specifically as follows:

[0015] Get the initial position parameters in the initial state:

[0016] H0=2dtanβ;

[0017] Where H0 is the initial position parameter, d is the vertical distance from the laser emission point to the surface of the motor winding insulation material;

[0018] After a certain time interval t1, measure the current position parameter H1 = Ω12dtanβ;

[0019] Where Ω1 is the deformation factor of the surface of the motor winding insulation material at time node t1;

[0020] At different time nodes t2, t3, t4...t n Measure the position parameters H2, H3, H4...H at the corresponding moment n , and obtain the corresponding deformation factors at different time nodes: Ω2, Ω3, Ω4, ...Ω n .

[0021] As a preferred embodiment, the method for judging whether the performance of the motor winding insulation material is normal based on the change of the deformation factor is specifically as follows:

[0022] Obtain the surface deformation factors of the motor winding insulation material at a preset number of different time nodes and calculate the root mean square average value Ω of each deformation factor rms ;

[0023] Preset performance warning range, calculate Ω rms Compare with the performance warning range and confirm whether the performance of the motor winding insulation material is normal based on the performance warning range.

[0024] On the other hand, the present invention also provides a system for detecting the performance of motor winding insulation materials based on micro-deformation analysis, comprising:

[0025] A set of laser detectors fixed inside the target motor;

[0026] The laser detector is used to emit two laser beams to act on the surface of the motor winding insulation material, and obtain the reflected light signals of the two laser beams for storage;

[0027] The computer device is used to receive two beams of reflected light signals during continuous time periods and calculate the deformation factor of the surface of the motor winding insulation material at each time node, and judge whether the performance of the motor winding insulation material is normal based on the change of the deformation factor.

[0028] On the other hand, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and runnable on the processor, wherein when the processor executes the program, it implements the method for detecting the performance of motor winding insulation materials based on micro-deformation analysis as described in any embodiment of the present invention.

[0029] On the other hand, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for detecting the performance of motor winding insulation materials based on micro-deformation analysis as described in any embodiment of the present invention.

[0030] The present invention has the following beneficial effects:

[0031] The present invention sets a laser detector inside the motor and uses high-precision dual-beam lasers to act on the specific surface of the material to accurately monitor the micro-deformation of the material, thereby realizing non-destructive testing of the insulation material performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the method flow of embodiment 1 of the present invention;

[0033] Figure 2 Schematic diagram of the working principle of the laser detector in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be understood that the step numbers used herein are only for convenience of description and are not intended to limit the order in which the steps are to be executed.

[0036] It should be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0037] The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0038] The term "and / or" refers to and includes any and all possible combinations of one or more of the associated listed items.

[0039] Example 1:

[0040] See also Figure 1 This embodiment provides a method for detecting the performance of motor winding insulation materials based on micro-deformation analysis, comprising the following steps:

[0041] S100. Fix a group of laser detectors inside the target motor. The laser detectors can be arranged at equal intervals, or according to the distribution of the stator windings, or according to the locations where the motor insulation materials are prone to aging based on previous test results. The laser detectors operate in an off-grid self-powered mode. An induction coil is provided in the laser detector, which generates a stable power supply through changes in the magnetic field inside the motor. The power supply voltage is 3 to 5V.

[0042] S200, emitting two laser beams through a laser detector to act on the surface of the motor winding insulation material, and obtaining and storing reflected light signals of the two laser beams;

[0043] S300. In continuous time periods, the deformation factor of the surface of the motor winding insulation material at each time node is calculated using two beams of reflected light signals. Based on the change in the deformation factor, a signal of the surface deformation of the insulation material is obtained. Through comparative analysis, information on micro-changes in the appearance of the insulation material is obtained, thereby determining whether the performance of the motor winding insulation material is normal.

[0044] As a preferred implementation of this embodiment, the following steps are also included:

[0045] After fixing the laser detector, the surface of the insulating material within the laser action range emitted by the laser detector (that is, the laser irradiates the specific surface of the stator winding insulating material, the surface area is generally 1cm 2 ) is polished to make the corresponding surface flatness ≤ 2μm / cm2 and the reflectivity to laser > 50%.

[0046] As a preferred implementation of this embodiment, the following steps are also included:

[0047] Adjust the angles of the two laser beams emitted by the laser detector, where the first laser beam is perpendicular to the surface of the motor winding insulation material. The first laser beam returns to the surface of the laser detector through the specific surface along the original path, and obtains the distance d from the laser to the surface of the winding insulation material. Affected by the internal structure of the motor, the value of d is generally on the order of millimeters to centimeters; adjust the angle β between the second laser beam and the first laser beam, that is, the second laser beam is not perpendicular to the surface of the winding insulation material, but has an incident angle β. After the second laser beam is reflected by the specific surface, it reaches the laser detector.

[0048] The laser detector uses visible light with a wavelength range of 450nm to 750nm. The laser beam spot area is 1mm², and the intensity is adjustable to a maximum of 800mW / cm². The two laser pulses have the same emission frequency of 50 to 60Hz. The angle β between the two laser beams is adjustable from 0.1° to 5°.

[0049] As a preferred implementation of this embodiment, the step of calculating the deformation factor of the surface of the motor winding insulation material at each time node using two reflected light signals is specifically as follows:

[0050] The dual laser beams act on a specific surface and then reflect from the surface. The signals of the two optical paths are detected on the laser detector. The initial position parameters are established based on the distribution of these two signals:

[0051] H0=2dtanβ;

[0052] Where H0 is the initial position parameter, d is the vertical distance from the laser emission point to the surface of the motor winding insulation material;

[0053] After a certain time interval t1, measure the current position parameter H1 = Ω12dtanβ;

[0054] Where Ω1 is the deformation factor of the surface of the motor winding insulation material at time node t1;

[0055] At different time nodes t2, t3, t4...t n Measure the position parameters H2, H3, H4...H at the corresponding moment n , and obtain the corresponding deformation factors at different time nodes: Ω2, Ω3, Ω4, ...Ω n The time intervals between the above-mentioned different time nodes are time constants that are highly correlated with the laser pulse frequency. This time interval is also highly correlated with the motor speed. One pulse or several pulses can be used as a time interval.

[0056] To help those skilled in the art better understand the principles of this embodiment, see Figure 2 , Figure 2 The upper middle part is the micro laser detector, the lower part is the specific surface of the motor winding insulation material, L1 is the first laser beam emitted vertically, L2 is the second laser beam with a certain angle β with L1, and H is the corresponding position parameter.

[0057] As a preferred implementation of this embodiment, the method for judging whether the performance of the motor winding insulation material is normal based on the change of the deformation factor is specifically as follows:

[0058] Obtain the deformation factors of the surface of the motor winding insulation material at a preset number of different time nodes. In this embodiment, 50 to 60 groups of deformation factors are used as a model sample, and the root mean square average value Ω of each deformation factor is calculated. rms ;

[0059] Configure the warning strategy, connect to the user display terminal, preset the performance warning range, and calculate the Ω rms Compared with the performance warning range, it is confirmed whether the performance of the motor winding insulation material is normal based on the performance warning range to which it belongs; in this embodiment, the warning strategy for is: when Ω rms When the insulation material of the motor stator winding is normal, it is considered that the insulation material of the motor stator winding is normal. rms <5%,a first-level warning of the motor stator winding insulation material is given. When 5%≤Ω rms When the motor stator winding insulation material is damaged, a secondary warning is given.

[0060] Example 2:

[0061] This embodiment provides a system for detecting the performance of motor winding insulation materials based on micro-deformation analysis, including:

[0062] A set of laser detectors fixed inside the target motor;

[0063] The laser detector is used to emit two laser beams to act on the surface of the motor winding insulation material, and obtain and store the reflected light signals of the two laser beams; the laser detector is used to implement the function of step S200 in Example 1, and will not be repeated here;

[0064] A computer device is used to receive and calculate the deformation factor of the surface of the motor winding insulation material at each time node through two beams of reflected light signals during continuous time periods, and judge whether the performance of the motor winding insulation material is normal based on the change in the deformation factor; the laser detector is used to implement the function of step S300 in Example 1, which will not be repeated here.

[0065] Example 3:

[0066] This embodiment proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method for detecting the performance of motor winding insulation materials based on micro-deformation analysis as described in any embodiment of the present invention is implemented.

[0067] Example 4:

[0068] This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the method for detecting the performance of motor winding insulation materials based on micro-deformation analysis as described in any embodiment of the present invention is implemented.

[0069] In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can represent: a, b, c, a and b, a and c, b and c or a and b and c, where a, b, c can be single or multiple.

[0070] Those skilled in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented using a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0071] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0072] In the several embodiments provided in this application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of this application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), magnetic disk or optical disk, and other media that can store program code.

[0073] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for detecting the performance of motor winding insulation materials based on micro-deformation analysis, characterized in that: The following steps are involved: A set of laser detectors is fixed inside the target motor; The laser detector emits two laser beams to act on the surface of the motor winding insulation material, and obtains and saves the reflected light signals of the two laser beams; In continuous time periods, the deformation factor of the surface of the motor winding insulation material at each time node is calculated using two beams of reflected light signals, and whether the performance of the motor winding insulation material is normal is determined based on the change in the deformation factor; The following steps are also included: Adjust the angles of the two laser beams emitted by the laser detector, where the first laser beam is perpendicular to the surface of the motor winding insulation material, and adjust the angle β between the second laser beam and the first laser beam; The step of calculating the deformation factor of the surface of the motor winding insulation material at each time node by using the two reflected light signals is specifically as follows: Get the initial position parameters in the initial state: H0=2dtanβ; Where H0 is the initial position parameter, d is the vertical distance from the laser emission point to the surface of the motor winding insulation material; After a certain time interval t1, measure the current position parameter H1=Ω12dtanβ; Where Ω1 is the deformation factor of the surface of the motor winding insulation material at time node t1; At different time nodes t2, t3, t4...t n Measure the position parameters H2, H3, H4...H at the corresponding moment n , and obtain the corresponding deformation factors at different time nodes: Ω2, Ω3, Ω4, ...Ω n ; The method for judging whether the performance of the motor winding insulation material is normal based on the change of the deformation factor is specifically as follows: Obtain the surface deformation factors of the motor winding insulation material at a preset number of different time nodes and calculate the root mean square average value Ω of each deformation factor rms ; Preset performance warning range, calculate Ω rms Compare with the performance warning range and confirm whether the performance of the motor winding insulation material is normal based on the performance warning range.

2. The method for detecting the performance of motor winding insulation materials based on micro-deformation analysis according to claim 1, characterized in that: The following steps are also included: After fixing the laser detector, the surface of the insulating material within the laser action range emitted by the laser detector is polished to make the flatness of the corresponding surface ≤ 2μm / cm2 and the reflectivity of the laser greater than 50%.

3. A system for detecting the performance of motor winding insulation materials based on micro-deformation analysis, used to implement the method for detecting the performance of motor winding insulation materials based on micro-deformation analysis as described in any one of claims 1-2, characterized in that: The system includes: A set of laser detectors fixed inside the target motor; The laser detector is used to emit two laser beams to act on the surface of the motor winding insulation material, and obtain the reflected light signals of the two laser beams for storage; The computer device is used to receive two beams of reflected light signals during continuous time periods and calculate the deformation factor of the surface of the motor winding insulation material at each time node, and judge whether the performance of the motor winding insulation material is normal based on the change of the deformation factor.

4. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method for detecting the performance of motor winding insulation materials based on micro-deformation analysis as described in any one of claims 1 to 2 is implemented.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for detecting the performance of motor winding insulation materials based on micro-deformation analysis as described in any one of claims 1 to 2 is implemented.

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