Method, device and equipment for evaluating the lifetime of an electric machine stator insulation system

Abstract

The application discloses a kind of life evaluation method, device and equipment of motor stator insulation system, by respectively simulating residual life evaluation to motor stator insulation system of different running time in actual working condition, obtain different simulated residual life value, utilize different actual working condition running length and simulated residual life value to obtain the relationship of the real residual life value of motor stator insulation system and simulated residual life value, to be used for according to the simulated residual life value of stator insulation system and the relationship of the simulated residual life value and real residual life value of stator insulation system to determine the real residual life value of stator insulation system.The application can determine the relationship of the real residual life value of stator insulation system and simulated residual life value, and then can accurately evaluate the real residual life of stator insulation system.

Description

Technical Field

[0001] This application relates to the field of life testing technology, specifically to a method, apparatus, equipment, storage medium, and computer program product for life assessment of an electric motor stator insulation system. Background Technology

[0002] The stator insulation system is an important component of generators and motors. The insulation condition of the stator insulation system is a key factor affecting the service life of the motor. Therefore, correctly and effectively assessing the life of the stator insulation system is an important means to ensure the safe and reliable operation of the motor.

[0003] Currently, the life assessment of stator insulation systems is mostly based on simulation assessment, which involves establishing simulated samples and evaluating their lifespan through testing. However, this simulation assessment method cannot correspond to real operating conditions and therefore cannot accurately assess the lifespan of the stator insulation system. Summary of the Invention

[0004] This application provides a method, apparatus, device, storage medium, and computer program product for assessing the lifespan of a motor stator insulation system. It can determine the relationship between the actual remaining lifespan value and the simulated remaining lifespan value of the stator insulation system, thereby accurately assessing the actual remaining lifespan value of the stator insulation system, improving the accuracy of motor lifespan assessment, and enabling timely motor replacement.

[0005] In a first aspect, embodiments of this application provide a method for assessing the lifespan of a motor stator insulation system, comprising: step 1, obtaining a first simulated remaining lifespan value of a first stator insulation system under a preset coupling field, wherein the first stator insulation system is a stator insulation system after operating for a first preset time under actual operating conditions; step 2, obtaining a second simulated remaining lifespan value of a second stator insulation system under the preset coupling field, wherein the second stator insulation system is a stator insulation system after operating for a second preset time under actual operating conditions; step 3, calculating a correction coefficient based on the first preset time, the second preset time, the first simulated remaining lifespan value, and the second simulated remaining lifespan value, for use in determining the true remaining lifespan value of the stator insulation system based on the obtained simulated remaining lifespan value of the stator insulation system and the correction coefficient; wherein the correction coefficient is the ratio of the true remaining lifespan value of the stator insulation system to the simulated remaining lifespan value, and the first stator insulation system and the second stator insulation system are stator insulation systems with identical structures.

[0006] According to the aforementioned embodiments of the first aspect of this application, before steps 1 and 2, the life assessment method further includes: constructing the preset coupling field based on at least two preset key stresses that affect the insulation life of the stator insulation system, wherein the preset key stresses include at least two of electrical stress, thermal stress, thermomechanical stress, and environmental stress; this can improve the accuracy of the correction coefficient, thereby improving the accuracy of the life assessment of the stator insulation system.

[0007] According to any of the foregoing embodiments of the first aspect of this application, the first stator insulation system and the second stator insulation system each include a plurality of coils; step 1 further includes: acquiring withstand voltage test data obtained by conducting withstand voltage performance tests on the plurality of coils in the first stator insulation system after aging tests under the preset coupling field; calculating the first simulated remaining lifetime value based on the aging time data and withstand voltage test data of the aging tests on the plurality of coils in the first stator insulation system; step 2 further includes: acquiring withstand voltage test data obtained by conducting withstand voltage performance tests on the plurality of coils in the second stator insulation system after aging tests under the preset coupling field; calculating the second simulated remaining lifetime value based on the aging time data and withstand voltage test data of the aging tests on the plurality of coils in the second stator insulation system; wherein, the withstand voltage test data includes one of breakdown voltage and breakdown time; by conducting withstand voltage performance tests on the coils of the stator insulation system, the withstand voltage performance of the stator insulation system can be accurately reflected. Therefore, based on the aging time data and withstand voltage test data of the aging tests on the plurality of coils in the stator insulation system, the simulated remaining lifetime value of the stator insulation system can be calculated, which is low in cost and highly accurate.

[0008] According to any of the foregoing embodiments of the first aspect of this application, the step of calculating the first simulated remaining lifetime value based on aging time data and withstand voltage test data of multiple coils in the first stator insulation system, and calculating the second simulated remaining lifetime value based on aging time data and withstand voltage test data of multiple coils in the second stator insulation system, includes: using a Weibull distribution model or a generalized Alling model to calculate the aging time data and withstand voltage test data of the first stator insulation system and the second stator insulation system respectively, to obtain the first simulated remaining lifetime value and the second simulated remaining lifetime value; the Weibull distribution can obtain accurate data from a large sample using a small sample, which can reduce the number of tests and ensure data accuracy.

[0009] According to any of the foregoing embodiments of the first aspect of this application, the second stator insulation system comprises N stator insulation systems with different operating durations; step 3 further includes: calculating N correction coefficients based on the first preset duration, the first simulated remaining life value, and the operating duration and second simulated remaining life value of each of the N second stator insulation systems, and obtaining the correction coefficients based on the N evaluation correction coefficients; this can effectively improve the accuracy of the correction coefficients, thereby improving the accuracy of the stator insulation system life assessment.

[0010] According to any of the foregoing embodiments of the first aspect of this application, the first preset duration is zero.

[0011] Secondly, embodiments of this application provide a life assessment device for a motor stator insulation system. The life assessment device includes: an acquisition module, used to acquire a first simulated remaining life value of a first stator insulation system under a preset coupling field, and a second simulated remaining life value of a second stator insulation system under a preset coupling field, wherein the first stator insulation system is a stator insulation system after operating for a first preset time under actual operating conditions, and the second stator insulation system is a stator insulation system after operating for a second preset time under actual operating conditions, and the first stator insulation system and the second stator insulation system are stator insulation systems with the same structure; and a calculation module, used to calculate a correction coefficient based on the first preset time, the second preset time, the first simulated remaining life value, and the second simulated remaining life value, so as to determine the true remaining life value of the stator insulation system based on the acquired simulated remaining life value of the stator insulation system and the correction coefficient; wherein the correction coefficient is the ratio of the true remaining life value of the stator insulation system to the simulated remaining life value.

[0012] According to the foregoing embodiments of the second aspect of this application, the life assessment device further includes: a coupling field construction module, used to construct the preset coupling field based on at least two preset key stresses that affect the insulation life of the stator insulation system.

[0013] According to any of the foregoing embodiments of the second aspect of this application, the first stator insulation system and the second stator insulation system each include a plurality of coils; the acquisition module acquires aging time data of the plurality of coils in the first stator insulation system under the preset coupling field and withstand voltage test data obtained by conducting withstand voltage performance tests, and acquires aging time data of the plurality of coils in the second stator insulation system under the preset coupling field and withstand voltage test data obtained by conducting withstand voltage performance tests; the calculation module calculates the first simulated remaining lifetime value based on the aging time data and withstand voltage test data of the plurality of coils in the first stator insulation system, and calculates the second simulated remaining lifetime value based on the aging time data and withstand voltage test data of the plurality of coils in the second stator insulation system; wherein, the withstand voltage test data includes one of breakdown voltage and breakdown time.

[0014] According to any of the foregoing embodiments of the second aspect of this application, the calculation module is specifically used to calculate the aging time data and withstand voltage test data of the first stator insulation system and the second stator insulation system using the Weibull distribution model or the generalized Alling model, respectively, to obtain the first simulated remaining lifetime value and the second simulated remaining lifetime value.

[0015] According to any of the foregoing embodiments of the second aspect of this application, the second stator insulation system comprises N stator insulation systems with different operating durations; the calculation module is specifically used to calculate N evaluation correction coefficients based on the first preset duration, the first simulated remaining life value, and the operating duration and second simulated remaining life value of each of the N second stator insulation systems, and to obtain the correction coefficients based on the N evaluation correction coefficients.

[0016] Thirdly, embodiments of this application provide a life assessment device, the life assessment device comprising: a processor and a memory storing computer program instructions; the processor, when executing the computer program instructions, implements the life assessment method as described in any of the preceding embodiments.

[0017] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer program instructions, which, when executed by a processor, implement the lifetime assessment method as described in any of the preceding embodiments.

[0018] Fifthly, embodiments of this application provide a computer program product in which instructions, when executed by a processor of an electronic device, cause the electronic device to perform a lifetime assessment method as described in any of the preceding embodiments.

[0019] The life assessment method, apparatus, equipment, storage medium, and computer program product for motor stator insulation systems provided in this application assess the remaining life of motor stator insulation systems with different operating times under actual working conditions by performing simulated remaining life assessments, obtaining different simulated remaining life values. By using the different actual operating times and simulated remaining life values, the relationship between the actual remaining life value and the simulated remaining life value of the motor stator insulation system is obtained. Based on the relationship between the simulated remaining life value and the actual remaining life value of the stator insulation system, the actual remaining life value of the stator insulation system is determined, resulting in an accurate and reliable assessment. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals denote the same or similar features, and the drawings are not drawn to scale.

[0021] Figure 1 A schematic flowchart illustrating a life assessment method for a motor stator insulation system provided in an embodiment of this application;

[0022] Figure 2 A flowchart illustrating a life assessment method for a motor stator insulation system provided in another embodiment of this application;

[0023] Figure 3 A flowchart illustrating a life assessment method for a motor stator insulation system provided in another embodiment of this application;

[0024] Figure 4 A flowchart illustrating a life assessment method for an electric motor stator insulation system provided in another embodiment of this application;

[0025] Figure 5 A schematic diagram of the structure of a life assessment device for a motor stator insulation system provided in an embodiment of this application;

[0026] Figure 6 A schematic diagram of the structure of a life assessment device for a motor stator insulation system provided in another embodiment of this application;

[0027] Figure 7 A schematic diagram of the hardware structure of a life assessment device for a motor stator insulation system provided in an embodiment of this application. Detailed Implementation

[0028] The features and exemplary embodiments of various aspects of this application will now be described in detail. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this application and are not configured to limit this application. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples of this application.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0030] To better understand this application, the following will be combined with Figures 1 to 7 The present application provides a detailed description of the life assessment method, apparatus, device, storage medium, and computer program product for motor stator insulation systems according to embodiments of this application.

[0031] The stator insulation system is an important component of a generator. Currently, the life assessment of the stator insulation system is mostly based on simulation assessment. However, this simulation assessment method cannot correspond to real operating conditions, and therefore cannot accurately assess the life of the stator insulation system.

[0032] To address the aforementioned issues, this application provides a method, apparatus, device, storage medium, and computer program product for assessing the lifespan of a motor stator insulation system. This method can determine the ratio between the actual remaining lifespan of the stator insulation system and the simulated remaining lifespan, thereby enabling accurate assessment of the actual remaining lifespan of the stator insulation system.

[0033] Figure 1 This is a flowchart illustrating a life assessment method for a motor stator insulation system provided in an embodiment of this application.

[0034] like Figure 1 As shown in the embodiment of this application, the life assessment method for the motor stator insulation system includes steps S1 to S3.

[0035] In step S1, the first simulated remaining life value of the first stator insulation system under a preset coupling field is obtained. The first stator insulation system is the stator insulation system after running for a first preset time under actual working conditions.

[0036] In step S2, the second simulated remaining lifetime value of the second stator insulation system under a preset coupling field is obtained. The second stator insulation system is the stator insulation system after running for a second preset time under actual working conditions.

[0037] The first stator insulation system and the second stator insulation system have different operating durations under actual working conditions. This application does not impose specific limitations on the first preset duration and the second preset duration. As long as the first preset duration and the second preset duration are not equal and are less than or equal to the actual lifespan of the stator insulation system, they are all within the protection scope of this application.

[0038] The order of steps S1 and S2 is not important. Step S1 can be performed first and then step S2, or step S2 can be performed first and then step S1, or steps S1 and S2 can be performed simultaneously. All of these are within the scope of protection of this application.

[0039] In step S3, a correction coefficient is calculated based on the first preset duration, the second preset duration, the first simulated remaining life value, and the second simulated remaining life value, so as to determine the true remaining life value of the stator insulation system based on the obtained simulated remaining life value of the stator insulation system and the correction coefficient.

[0040] The actual remaining life of the stator insulation system is its remaining service life under actual operating conditions, while the simulated remaining life is its remaining service life under a preset coupling field. For stator insulation systems that have never been operated under actual operating conditions (i.e., whose operating time under actual operating conditions is zero), the actual remaining life is its actual life, and the simulated remaining life is its simulated life.

[0041] The correction factor can be the ratio of the actual remaining life of the stator insulation system to the simulated remaining life. The formula for calculating the correction factor is:

[0042] α=|T1′-T2′| / |t2-t1| (1)

[0043] In equation (1), α is the correction coefficient, T1′ is the first preset duration, T2′ is the second preset duration, the first simulated remaining lifespan value is t1, the second simulated remaining lifespan value is t2, and the units of T1′, T2′, t2 and t1 are the same.

[0044] The derivation of equation (1) is as follows:

[0045] Assuming the true lifespan of the stator insulation system, which has not been operated under actual conditions, is A, then

[0046] T1=A-T1′ (2)

[0047] T2=A-T2′ (3)

[0048] ΔA=|T1-T2| (4)

[0049] Where T1′ is the first preset duration, T2′ is the second preset duration, T1 is the actual remaining life value of the first stator insulation system, T2 is the actual remaining life value of the second stator insulation system, ΔA is the difference between the actual remaining life values ​​of the first stator insulation system and the second stator insulation system, and the units of T1′, T2′, T1, T1′, T2′, t2 and t1 are the same.

[0050] According to equations (2) to (4), we can obtain:

[0051] ΔA=|T2′-T1′| (5)

[0052] again,

[0053] Δt=|t1-t2| (6)

[0054] α′=ΔA / Δt (7)

[0055] Where t1 is the first simulated remaining lifetime value of the first stator insulation system under the preset coupling field, t2 is the second simulated remaining lifetime value of the second stator insulation system under the preset coupling field, Δt is the difference between the simulated remaining lifetimes of the first stator insulation system and the second stator insulation system, and α′ is the ratio of the difference between the actual remaining lifetimes of the first stator insulation system and the second stator insulation system to the difference between the simulated remaining lifetimes.

[0056] According to equations (5) to (7), we can obtain:

[0057] α′=|T2′-T1′| / |t1-t2| (8)

[0058] Since the ratio of the difference between the actual remaining life and the simulated remaining life of the first and second stator insulation systems, as well as the ratio of the actual remaining life to the simulated remaining life of the first and second stator insulation systems, both reflect the relationship between the remaining service life of the stator insulation system under actual operating conditions and its remaining service life in the preset coupling field, therefore:

[0059] α=α′ (9)

[0060] Equation (1) can be obtained from equations (8) and (9), that is, according to the life assessment method of the motor stator insulation system provided in the embodiments of this application, the relationship between the actual remaining life value and the simulated remaining life value of the motor stator insulation system can be obtained.

[0061] It should be noted that, to ensure the accuracy of the correction factor, the first stator insulation system and the second stator insulation system are stator insulation systems with the same structure.

[0062] When it is necessary to evaluate the true remaining life of a stator insulation system, a simulated remaining life evaluation can first be performed on the stator insulation system under a preset coupling field to obtain the simulated remaining life value. Then, the true remaining life value of the stator insulation system can be obtained based on this simulated remaining life value and a correction factor. The formula for calculating the true remaining life value of the stator insulation system is as follows:

[0063] T=α×t (10)

[0064] Where T is the actual remaining life of the stator insulation system, and t is the simulated remaining life of the stator insulation system under the preset coupling field.

[0065] When the stator insulation system operates for zero time under actual conditions, the simulated remaining life value t of the stator insulation system under the preset coupling field is equal to the simulated life value a under the preset coupling field, and the actual remaining life value T of the stator insulation system is equal to its actual life value A, that is: A=T=α×t.

[0066] In some embodiments, the operating time of the first stator insulation system under actual operating conditions, i.e., the first preset time T1′, can be zero. In this case, the first stator insulation system is a stator insulation system that has not been operated under actual operating conditions. Therefore, there is no need to perform a simulated remaining life assessment of the stator insulation system under the preset coupling field. The actual life value A of the stator insulation system can be calculated directly based on the first simulated remaining life value t1 of the first stator insulation system under the preset coupling field and the correction coefficient α, i.e., A=α×t1.

[0067] According to the life assessment method for motor stator insulation system provided in the embodiments of this application, the relationship between the simulated remaining life value and the actual remaining life value of the stator insulation system is used to determine the actual remaining life value of the stator insulation system, which can accurately assess the actual remaining life of the stator insulation system and the actual life of the motor stator insulation system that has not been operated in actual working conditions.

[0068] It should be noted that the insulation life of the stator insulation system determines the service life of the stator insulation system. Therefore, the factors that affect the insulation life of the stator insulation system are the same factors that affect the service life of the stator insulation system. The service life of the stator insulation system can be determined by evaluating its insulation life.

[0069] Figure 2 A flowchart illustrating a life assessment method for an electric motor stator insulation system provided in another embodiment of this application.

[0070] like Figure 2 As shown, in some embodiments, before steps 1 and 2, the life assessment method provided in this application may further include step S4.

[0071] In step S4, a preset coupling field is constructed based on at least two preset key stresses that affect the insulation life of the stator insulation system. The preset key stresses include at least two of the following: electrical stress, thermal stress, thermomechanical stress, and environmental stress.

[0072] The preset coupling field is a test field that can accelerate the aging of the stator insulation system. It superimposes multiple key stresses that affect the insulation life of the stator insulation system to form a coupling field, making the correspondence between the preset coupling field and the actual working conditions more accurate, improving the accuracy of the correction coefficient, and thus improving the accuracy of the life assessment of the stator insulation system.

[0073] There are many stresses that affect the insulation life of the stator insulation system, mainly including electrical stress, thermal stress, thermomechanical stress and environmental stress. In some embodiments, at least two key stresses affecting the motor stator insulation system can be identified from each stress through orthogonal experimental design. Then, coupling experimental design is carried out on the identified at least two key stresses to form a preset coupling field, which is highly efficient and economical.

[0074] Figure 3 A flowchart illustrating a life assessment method for a motor stator insulation system provided in another embodiment of this application.

[0075] In some embodiments, the first stator insulation system includes a plurality of coils, such as Figure 3 As shown, step S1 may include:

[0076] S11, Obtain the withstand voltage test data obtained by conducting an aging test on multiple coils in the first stator insulation system under a preset coupling field and then performing a withstand voltage performance test.

[0077] S12, based on the aging time data and withstand voltage test data of multiple coils in the first stator insulation system, the first simulated remaining life value is calculated.

[0078] Specifically, the first stator insulation system is placed in a preset coupling field to conduct accelerated aging tests on each coil of the first stator insulation system. After a first preset aging time, a group of coils is taken out from the preset coupling field and subjected to a voltage breakdown test to determine the withstand voltage value of the group of coils, i.e., the withstand voltage value of the coil with an aging time of the first preset aging time. After a second preset aging time, another group of coils is taken out from the preset coupling field and subjected to a voltage breakdown test to determine the withstand voltage value of the coil with an aging time of the second preset aging time. The remaining groups of coils are subjected to voltage breakdown tests in sequence according to the above method to determine the withstand voltage value of each group of coils under different aging times. The aging time of each group of coils is the aging time data of the aging test of multiple coils in the first stator insulation system, and the withstand voltage value of each group of coils is the withstand voltage value test data of the aging test of multiple coils in the first stator insulation system.

[0079] Each group of coils may include one or more coils. In some embodiments, each group of coils includes multiple coils. Voltage breakdown tests are performed on the multiple coils in each group of coils. The median or average of the withstand voltage values ​​of each coil can be taken as the withstand voltage value of the group of coils. Alternatively, the withstand voltage values ​​of each coil can be recorded separately, so that the withstand voltage values ​​of each group of coils include multiple values.

[0080] It should be noted that before placing the first stator insulation system in a preset coupling field for accelerated aging testing, a routine factory insulation assessment of the first stator insulation system can be performed first to ensure that no insulation problems occur before the accelerated aging test, so as to ensure the accuracy of the subsequent voltage breakdown test results.

[0081] In some embodiments, when performing a voltage breakdown test on a coil, different voltages can be applied sequentially from low to high until the coil breaks down, and the breakdown voltage of the coil is recorded as its withstand voltage value; of course, a fixed voltage can also be applied to the coil, and the breakdown time of the coil can be recorded as its withstand voltage value, which is also within the protection scope of this application.

[0082] It is understandable that if the breakdown voltage of the coil determined by the voltage breakdown test is less than or equal to the preset qualified breakdown voltage (or the breakdown time of the coil is greater than or equal to the preset qualified breakdown time), it means that the aging time of the coil is less than its simulated remaining life value, and vice versa.

[0083] Since each coil in the stator insulation system is a complete insulation structure, the withstand voltage performance of the stator insulation system can be accurately reflected by testing the withstand voltage performance of the coil. Therefore, based on the aging time data and withstand voltage test data of multiple coils in the stator insulation system, the simulated remaining life value of the stator insulation system can be calculated, which is low in cost and highly accurate.

[0084] Please continue to refer to this. Figure 3 In some embodiments, the second stator insulation system includes multiple coils, and step S2 may include:

[0085] S21, Obtain withstand voltage test data after aging test of multiple coils in the second stator insulation system under a preset coupling field and then conducting withstand voltage performance test;

[0086] S22, the second simulated remaining life value is calculated based on the aging time data and withstand voltage test data of multiple coils in the second stator insulation system.

[0087] The withstand voltage test data includes either the breakdown voltage or the breakdown time.

[0088] The method for obtaining the second simulated remaining lifetime value of the second stator insulation system under a preset coupling field is the same as the method for obtaining the first simulated remaining lifetime value of the first stator insulation system under a preset coupling field, and will not be described again here.

[0089] There are multiple methods for calculating the first simulated remaining life value of the first stator insulation system based on aging time data and withstand voltage test data of multiple coils in the first stator insulation system; and multiple methods for calculating the second simulated remaining life value of the second stator insulation system based on aging time data and withstand voltage test data of multiple coils in the second stator insulation system.

[0090] In some embodiments, the Weibull distribution model can be used to calculate the aging time data and withstand voltage test data of the first stator insulation system to obtain the first simulated remaining life value of the first stator insulation system.

[0091] In some embodiments, the Weibull distribution model can be used to calculate the aging time data and withstand voltage test data of the second stator insulation system to obtain the second simulated remaining life value of the second stator insulation system.

[0092] The Weibull distribution can obtain accurate data from a large sample using a small sample, which can reduce the number of trials while ensuring data accuracy.

[0093] Of course, other data models such as the generalized Erin model can also be used to calculate the aging time data and withstand voltage test data of the first stator insulation system and the second stator insulation system respectively. As long as the first simulated remaining life value and the second simulated remaining life value can be obtained, they are all within the protection scope of this application.

[0094] Figure 4 This is a flowchart illustrating a method for assessing the lifespan of a motor stator insulation system, provided in yet another embodiment of this application.

[0095] like Figure 4 As shown, in some embodiments, the lifetime assessment method provided in this application allows the second stator insulation system to be N stator insulation systems with different operating times. In step S2, the second simulated remaining lifetime value of each of the N second stator insulation systems under a preset coupling field is obtained; step S3 may include:

[0096] N correction coefficients are calculated based on the first preset duration, the first simulated remaining life value, and the running duration and the second simulated remaining life value of each of the N second stator insulation systems. The correction coefficients are then obtained based on the N evaluation correction coefficients.

[0097] By using the first stator insulation system and multiple second stator insulation systems with different operating times to obtain multiple evaluation correction coefficients, and then obtaining correction coefficients based on these multiple evaluation correction coefficients, the accuracy of the correction coefficients can be effectively improved, thereby improving the accuracy of the stator insulation system life assessment.

[0098] In some embodiments, the average of N evaluation correction coefficients can be taken as the correction coefficient, and the calculation method is simple.

[0099] In summary, the life assessment method for motor stator insulation system provided in this application provides a method for assessing the life of motor stator insulation system by performing simulated remaining life assessments on motor stator insulation systems with different operating times under actual working conditions, thereby obtaining different simulated remaining life values. By using the different actual operating times and simulated remaining life values, the relationship between the actual remaining life value and the simulated remaining life value of the motor stator insulation system can be obtained, thus enabling accurate assessment of the actual remaining life of the stator insulation system.

[0100] Figure 5 This is a schematic diagram of the life assessment device for a motor stator insulation system provided in an embodiment of this application.

[0101] Based on the life assessment method in the above embodiments, correspondingly, this application also provides a life assessment device for a motor stator insulation system. For example... Figure 5 As shown, the life assessment device includes an acquisition module 11 and a calculation module 12.

[0102] The acquisition module 11 is used to acquire the first simulated remaining lifetime value of the first stator insulation system under a preset coupling field, and the second simulated remaining lifetime value of the second stator insulation system under a preset coupling field.

[0103] The calculation module 12 is used to calculate a correction coefficient based on the first preset duration, the second preset duration, the first simulated remaining life value, and the second simulated remaining life value, so as to determine the true remaining life value of the stator insulation system based on the obtained simulated remaining life value of the stator insulation system and the correction coefficient.

[0104] The first stator insulation system is the stator insulation system after operating for a first preset time under actual working conditions, and the second stator insulation system is the stator insulation system after operating for a second preset time under actual working conditions. The first stator insulation system and the second stator insulation system are stator insulation systems with the same structure.

[0105] The correction factor is the ratio of the actual remaining life of the stator insulation system to the simulated remaining life. Calculation module 12 can be specifically used to calculate the correction factor according to equation (1).

[0106] α=|T1′-T2′| / |t2-t1| (1)

[0107] In equation (1), α is the correction coefficient, T1′ is the first preset duration, T2′ is the second preset duration, the first simulated remaining lifespan value is t1, the second simulated remaining lifespan value is t2, and the units of T1′, T2′, t2 and t1 are the same.

[0108] When it is necessary to evaluate the true remaining life value of the stator insulation system, the simulated remaining life value of the stator insulation system can be obtained first using the acquisition module 11, and then the true remaining life value of the stator insulation system can be obtained based on the simulated remaining life value and the correction coefficient.

[0109] According to the life assessment device for motor stator insulation system provided in the embodiments of this application, the relationship between the simulated remaining life value and the actual remaining life value of the stator insulation system is used to determine the actual remaining life value of the stator insulation system, which can accurately assess the actual remaining life of the stator insulation system and the actual life of the motor stator insulation system that has not been operated in actual working conditions.

[0110] In some embodiments, the first stator insulation system and the second stator insulation system each include a plurality of coils; the acquisition module 11 can be used to acquire aging time data of the plurality of coils in the first stator insulation system under a preset coupling field aging test, and withstand voltage test data obtained by conducting withstand voltage performance test, and to acquire aging time data of the plurality of coils in the second stator insulation system under a preset coupling field aging test, and withstand voltage test data obtained by conducting withstand voltage performance test; the calculation module 12 is used to calculate a first simulated remaining lifetime value based on the aging time data and withstand voltage test data of the plurality of coils in the first stator insulation system aging test, and to calculate a second simulated remaining lifetime value based on the aging time data and withstand voltage test data of the plurality of coils in the second stator insulation system aging test; wherein, the withstand voltage test data includes one of breakdown voltage and breakdown time.

[0111] Since each coil in the stator insulation system is a complete insulation structure, the withstand voltage performance of the stator insulation system can be accurately reflected by testing the withstand voltage performance of the coil. Therefore, based on the aging time data and withstand voltage test data of multiple coils in the stator insulation system, the simulated remaining life value of the stator insulation system can be calculated, which is low in cost and highly accurate.

[0112] In some embodiments, the calculation module 12 can be specifically used to calculate the aging time data and withstand voltage test data of the first stator insulation system and the second stator insulation system using the Weibull distribution model or the generalized Alling model, respectively, to obtain the first simulated remaining lifetime value and the second simulated remaining lifetime value. The Weibull distribution can obtain accurate data from a large sample using a small sample, which can reduce the number of tests and ensure data accuracy.

[0113] Of course, the calculation module 12 can also be configured to use other data models such as the generalized Erin model to calculate the aging time data and withstand voltage test data of the first stator insulation system and the second stator insulation system respectively. As long as the first simulated remaining life value and the second simulated remaining life value can be obtained, they are all within the protection scope of this application.

[0114] In some embodiments, the second stator insulation system consists of N stator insulation systems with different operating times; the calculation module 12 can be specifically used to calculate N evaluation correction coefficients based on the first preset duration, the first simulated remaining life value, and the operating time and the second simulated remaining life value of each of the N second stator insulation systems, and to obtain correction coefficients based on the N evaluation correction coefficients.

[0115] By using the first stator insulation system and multiple second stator insulation systems with different operating times to obtain multiple evaluation correction coefficients, and then obtaining correction coefficients based on these multiple evaluation correction coefficients, the accuracy of the correction coefficients can be effectively improved, thereby improving the accuracy of the stator insulation system life assessment.

[0116] In some embodiments, the calculation module 12 can be specifically used to take the average of N evaluation correction coefficients as the correction coefficient, and the calculation method is simple.

[0117] Figure 6 This is a schematic diagram of the life assessment device for a motor stator insulation system provided in another embodiment of this application.

[0118] like Figure 6 As shown, in some embodiments, the life assessment device may further include a coupling field construction module 13, which is used to construct a preset coupling field based on at least two preset key stresses that affect the insulation life of the stator insulation system. The preset key stresses include at least two of electrical stress, thermal stress, thermomechanical stress, and environmental stress.

[0119] By superimposing multiple key stresses that affect the insulation life of the stator insulation system, a coupled field is formed, making the correspondence between the preset coupled field and the actual working conditions more accurate. This improves the accuracy of the correction coefficient and, consequently, the accuracy of the life assessment of the stator insulation system.

[0120] Figure 7 A schematic diagram of the hardware structure of a life assessment device for a motor stator insulation system provided in an embodiment of this application.

[0121] In addition, in conjunction with the life assessment method in the above embodiments, this application also provides a life assessment device. For example... Figure 7 As shown, the life assessment device includes a processor 21 and a memory 22 storing computer program instructions; when the processor 21 executes the computer program instructions, it implements the life assessment method as described in any of the previous embodiments.

[0122] Specifically, the processor 21 may include a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0123] Memory 22 may include mass storage for data or instructions. For example, and not limitingly, memory 22 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 22 may include removable or non-removable (or fixed) media. Where appropriate, memory 22 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, memory 22 is non-volatile solid-state memory.

[0124] Memory may include read-only memory (ROM), random access memory (RAM), disk storage media devices, optical storage media devices, flash memory devices, and electrical, optical, or other physical / tangible memory storage devices. Therefore, typically, memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the methods according to one aspect of this disclosure.

[0125] The processor 21 implements any of the lifetime assessment methods described in the above embodiments by reading and executing computer program instructions stored in the memory 22.

[0126] In one example, the life assessment device may also include a communication interface 23 and a bus 20. For example, Figure 3 As shown, the processor 21, memory 22, and communication interface 23 are connected through bus 20 and communicate with each other.

[0127] Communication interface 23 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0128] Bus 20 includes hardware, software, or both, that couples components of an online data traffic metering device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 20 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, this application contemplates any suitable bus or interconnect.

[0129] This life assessment device can achieve a combination of the life assessment method described in the embodiments of this application. Figures 1 to 6 The life assessment method and apparatus are described.

[0130] Furthermore, in conjunction with the lifetime assessment method in the above embodiments, this application embodiment can provide a computer storage medium for implementation. This computer-readable storage medium stores computer program instructions, which, when executed by a processor, implement the lifetime assessment method as described in any of the preceding embodiments.

[0131] In addition, in conjunction with the life assessment method in the above embodiments, this application embodiment can also provide a computer program product, wherein the instructions in the computer program product, when executed by the processor of an electronic device, cause the electronic device to perform the life assessment method as described in any of the preceding embodiments.

[0132] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0133] The functional blocks shown in the above-described structural diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0134] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0135] The aspects of this disclosure have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by special-purpose hardware performing the specified functions or actions, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0136] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A method for assessing the lifespan of a motor stator insulation system, characterized in that, include: Step 1: Obtain the first simulated remaining lifetime value of the first stator insulation system under a preset coupling field. The first stator insulation system is the stator insulation system after running for a first preset time under actual working conditions. Step 2: Obtain the second simulated remaining lifetime value of the second stator insulation system under the preset coupling field, wherein the second stator insulation system is the stator insulation system after running for a second preset time under actual working conditions; Step 3: Calculate a correction coefficient based on the first preset duration, the second preset duration, the first simulated remaining life value, and the second simulated remaining life value, so as to determine the true remaining life value of the stator insulation system based on the obtained simulated remaining life value of the stator insulation system and the correction coefficient. The step of calculating the correction coefficient based on the first preset duration, the second preset duration, the first simulated remaining lifetime value, and the second simulated remaining lifetime value includes: Determine the absolute value of the difference between the first preset duration and the second preset duration, and the absolute value of the difference between the first simulated remaining lifetime value and the second simulated remaining lifetime value; calculate the correction coefficient based on the ratio of the two absolute values ​​of difference; The first stator insulation system and the second stator insulation system are stator insulation systems with the same structure.

2. The life assessment method according to claim 1, characterized in that, Prior to steps 1 and 2, the life assessment method further includes: The preset coupling field is constructed based on at least two preset key stresses that affect the insulation life of the stator insulation system. The preset key stresses include at least two of the following: electrical stress, thermal stress, thermomechanical stress, and environmental stress.

3. The life assessment method according to claim 1, characterized in that, The first stator insulation system and the second stator insulation system each include multiple coils; Step 1 also includes: The withstand voltage test data is obtained by performing an aging test on multiple coils in the first stator insulation system under the preset coupling field and then performing a withstand voltage performance test. The first simulated remaining life value is calculated based on the aging time data and withstand voltage test data of multiple coils in the first stator insulation system. Step 2 also includes: The withstand voltage test data is obtained by performing an aging test on multiple coils in the second stator insulation system under the preset coupling field and then performing a withstand voltage performance test. The second simulated remaining life value is calculated based on the aging time data and withstand voltage test data of multiple coils in the second stator insulation system. The withstand voltage test data includes either the breakdown voltage or the breakdown time.

4. The life assessment method according to claim 3, characterized in that, The step of calculating the first simulated remaining life value based on aging time data and withstand voltage test data of multiple coils in the first stator insulation system; and calculating the second simulated remaining life value based on aging time data and withstand voltage test data of multiple coils in the second stator insulation system, includes: The aging time data and withstand voltage test data of the first stator insulation system and the second stator insulation system are calculated using the Weibull distribution model or the generalized Alling model, respectively, to obtain the first simulated remaining life value and the second simulated remaining life value.

5. The life assessment method according to claim 1, characterized in that, The second stator insulation system consists of N stator insulation systems with different operating durations; Step 3 also includes: N correction coefficients are calculated based on the first preset duration, the first simulated remaining life value, and the running duration and second simulated remaining life value of each of the N second stator insulation systems. The correction coefficients are then obtained based on the N evaluation correction coefficients.

6. The life assessment method according to claim 1, characterized in that, The first preset duration is zero.

7. A life assessment device for a motor stator insulation system, characterized in that, The life assessment device includes: The acquisition module is used to acquire the first simulated remaining lifetime value of the first stator insulation system under a preset coupling field, and the second simulated remaining lifetime value of the second stator insulation system under a preset coupling field. The first stator insulation system is the stator insulation system after running for a first preset time under actual working conditions, and the second stator insulation system is the stator insulation system after running for a second preset time under actual working conditions. The first stator insulation system and the second stator insulation system are stator insulation systems with the same structure. The calculation module is used to calculate a correction coefficient based on the first preset duration, the second preset duration, the first simulated remaining life value, and the second simulated remaining life value, so as to determine the actual remaining life value of the stator insulation system based on the obtained simulated remaining life value of the stator insulation system and the correction coefficient. The computing module is specifically used for: Determine the absolute value of the difference between the first preset duration and the second preset duration, and the absolute value of the difference between the first simulated remaining lifetime value and the second simulated remaining lifetime value; calculate the correction coefficient based on the ratio of the two absolute values ​​of the difference.

8. The life assessment device according to claim 7, characterized in that, The life assessment device also includes: A coupling field construction module is used to construct the preset coupling field based on at least two preset key stresses that affect the insulation life of the stator insulation system.

9. The life assessment device according to claim 7, characterized in that, The first stator insulation system and the second stator insulation system each include multiple coils; The acquisition module acquires aging time data of multiple coils in the first stator insulation system under the preset coupling field and withstand voltage test data obtained by the withstand voltage performance test, and acquires aging time data of multiple coils in the second stator insulation system under the preset coupling field and withstand voltage test data obtained by the withstand voltage performance test. The calculation module calculates the first simulated remaining life value based on the aging time data and withstand voltage test data of multiple coils in the first stator insulation system, and calculates the second simulated remaining life value based on the aging time data and withstand voltage test data of multiple coils in the second stator insulation system. The withstand voltage test data includes either the breakdown voltage or the breakdown time.

10. The life assessment device according to claim 9, characterized in that, The calculation module is specifically used to calculate the aging time data and withstand voltage test data of the first stator insulation system and the second stator insulation system using the Weibull distribution model or the generalized Alling model, respectively, to obtain the first simulated remaining life value and the second simulated remaining life value.

11. The life assessment device according to claim 7, characterized in that, The second stator insulation system consists of N stator insulation systems with different operating durations; The calculation module is specifically used to calculate N evaluation correction coefficients based on the first preset duration, the first simulated remaining life value, and the running duration and second simulated remaining life value of each of the N second stator insulation systems, and to obtain the correction coefficients based on the N evaluation correction coefficients.

12. A life assessment device, characterized in that, The life assessment device includes: a processor and a memory storing computer program instructions; the processor executes the computer program instructions to implement the life assessment method as described in any one of claims 1-6.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions that, when executed by a processor, implement the lifetime assessment method as described in any one of claims 1-6.

14. A computer program product, characterized in that, When the instructions in the computer program product are executed by the processor of the electronic device, the electronic device performs the life assessment method as described in any one of claims 1-6.

Images