CN112067992B - Degradation degree detection method, device, detection equipment and storage medium for motor winding - Google Patents
Degradation degree detection method, device, detection equipment and storage medium for motor winding Download PDFInfo
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- CN112067992B CN112067992B CN202010852069.2A CN202010852069A CN112067992B CN 112067992 B CN112067992 B CN 112067992B CN 202010852069 A CN202010852069 A CN 202010852069A CN 112067992 B CN112067992 B CN 112067992B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/346—Testing of armature or field windings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
Abstract
The application relates to a degradation degree detection method, a degradation degree detection device, a degradation degree detection equipment and a storage medium for motor windings. The degradation degree detection method of the motor winding comprises the steps of obtaining LCR parameters of the motor winding to be detected under each preset test frequency; generating a frequency spectrum characteristic curve according to each LCR parameter and the corresponding preset test frequency; extracting a curve of a preset frequency band in the frequency spectrum characteristic curve, and acquiring a maximum parameter value according to the curve of the preset frequency band; and processing the maximum parameter value and a preset reference value to obtain the degradation degree of the motor winding to be detected. The method makes up for the gap of the method for detecting the degradation degree of the winding of the direct-current traction motor. Compared with the traditional testing means, the nondestructive measurement of the degradation degree of the motor winding can be realized; this method contains more information than the dielectric parameter test method at a single frequency. Meanwhile, according to LCR spectrum characteristic analysis, a data evaluation system of the degradation degree of the traction motor winding can be perfected, and references can be provided for optimization of locomotive overhaul regulations.
Description
Technical Field
The present application relates to the field of motor detection technologies, and in particular, to a method, an apparatus, a detection device, and a storage medium for detecting a degradation degree of a motor winding.
Background
The direct current traction motor is core equipment of a high-speed heavy-load train, and the safety and stability of the train are affected by the insulation performance of the direct current traction motor. In the running process of the traction motor, the winding is influenced by multiple factors such as temperature, electric field and the like for a long time, so that the insulation state and the degradation degree of the winding are continuously changed, the safe and stable running of a train is threatened, and therefore, the winding is required to be subjected to preventive tests in the running process of the traction motor.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: traditional preventative tests are destructive.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a degradation degree detection method, apparatus, detection device, and storage medium for a motor winding that can be detected nondestructively.
In order to achieve the above object, in one aspect, an embodiment of the present application provides a degradation detection method for a motor winding, including the steps of:
obtaining LCR parameters of a motor winding to be tested under each preset test frequency;
generating a frequency spectrum characteristic curve according to each LCR parameter and the corresponding preset test frequency;
extracting a curve of a preset frequency band in the frequency spectrum characteristic curve, and acquiring a maximum parameter value according to the curve of the preset frequency band;
and processing the maximum parameter value and a preset reference value to obtain the degradation degree of the motor winding to be detected.
In one embodiment, the method further comprises the steps of:
acquiring blank LCR parameters of the new machine under each preset test frequency;
generating a blank frequency spectrum characteristic curve according to each blank LCR parameter and a corresponding preset test frequency;
and extracting a blank curve of a preset frequency range in the blank frequency spectrum characteristic curve, and acquiring a preset reference value according to the blank curve.
In one embodiment, the step of obtaining LCR parameters of the motor winding to be tested at each preset test frequency includes:
outputting an instruction to the LCR measuring instrument; the instruction is used for instructing the LCR measuring instrument to set the output frequency according to each preset test frequency, and respectively obtaining LCR parameters corresponding to each preset test frequency after the setting is completed.
In one embodiment, in the step of processing the maximum parameter value and the preset reference value to obtain the degradation degree of the motor winding to be tested, the degradation degree is obtained based on the following formula:
wherein DD is the degree of degradation; z is Z max Is the maximum parameter value; z is Z 0max Is a preset reference value.
In one embodiment, the LCR parameters include any one or any combination of the following parameters: inductance, capacitance, resistance, phase angle, loss, and impedance.
In one embodiment, each preset test frequency falls within the interval of 20Hz to 10 MHz.
In one aspect, an embodiment of the present application further provides a degradation detection apparatus for a motor winding, including:
the acquisition module is used for acquiring LCR parameters of the motor winding to be tested under each preset test frequency;
the curve generation module is used for generating a frequency spectrum characteristic curve according to each LCR parameter and the corresponding preset test frequency;
the extraction module is used for extracting a curve of a preset frequency band in the frequency spectrum characteristic curve and acquiring a maximum parameter value according to the curve of the preset frequency band;
and the degradation degree generation module is used for processing the maximum parameter value and a preset reference value to obtain the degradation degree of the motor winding to be detected.
In one aspect, the embodiment of the application also provides degradation detection equipment of the motor winding, which comprises an LCR measuring instrument, a processor and a memory, wherein the LCR measuring instrument is used for detecting the motor winding to be detected; the memory stores a computer program; the steps of any of the methods described above are carried out by the processor when executing the computer program.
In one embodiment, the motor winding testing device further comprises a testing box for containing the motor winding to be tested, a temperature sensor for detecting the temperature inside the testing box and a humidity sensor for detecting the humidity inside the testing box.
In another aspect, embodiments of the present application also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of any of the methods described above.
One of the above technical solutions has the following advantages and beneficial effects:
according to the degradation degree detection method of the motor winding, LCR parameters of the motor winding to be detected under each preset test frequency are firstly obtained; then generating a frequency spectrum characteristic curve according to each LCR parameter and the corresponding preset test frequency; secondly, extracting a curve of a preset frequency band in the frequency spectrum characteristic curve, and acquiring a maximum parameter value according to the curve of the preset frequency band; and finally, processing the maximum parameter value and a preset reference value to obtain the degradation degree of the motor winding to be tested. The method makes up for the gap of the method for detecting the degradation degree of the winding of the direct-current traction motor. Compared with the traditional testing means, the nondestructive measurement of the degradation degree of the motor winding can be realized; this method contains more information than the dielectric parameter test method at a single frequency. Meanwhile, according to LCR spectrum characteristic analysis, a data evaluation system of the degradation degree of the traction motor winding can be perfected, train overhaul service can be better provided, reference can be provided for optimization of locomotive overhaul regulations, and finally the purpose of state overhaul is achieved.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular description of preferred embodiments of the application, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intentionally drawn to scale on actual size or the like, with emphasis on illustrating the principles of the application.
FIG. 1 is a flow chart of a method for detecting degradation of a motor winding in one embodiment;
FIG. 2 is a flowchart illustrating steps for obtaining a preset reference value according to an embodiment;
FIG. 3 is a block diagram showing a degradation detection device for a motor winding in one embodiment;
FIG. 4 is a first schematic block diagram of a degradation detection device for a motor winding in one embodiment;
FIG. 5 is a second schematic block diagram of a degradation detection apparatus for a motor winding in one embodiment;
FIG. 6 is a third schematic block diagram of a degradation detection apparatus for a motor winding in one embodiment;
FIG. 7 is a schematic diagram of a resistance spectrum in one embodiment;
FIG. 8 is a schematic diagram of an inductance spectrum in one embodiment;
FIG. 9 is a schematic diagram of capacitance spectrum in one embodiment;
FIG. 10 is a schematic diagram of a phase angle spectrum in one embodiment;
FIG. 11 is a schematic diagram of a loss spectrum in one embodiment;
FIG. 12 is a schematic diagram of a resistive impedance spectrum in one embodiment;
FIG. 13 is a graph of stator winding impedance for the first 8 traction motors of an embodiment;
fig. 14 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the application. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
At present, the traditional preventive tests adopted when the winding of the direct current traction motor is overhauled mainly comprise insulation resistance, direct current resistance, alternating current withstand voltage tests and the like, but the insulation resistance, the direct current resistance, the alternating current withstand voltage tests and the like are single in data, the extractable information quantity is less, the insulation state of the traction motor cannot be comprehensively reflected, and the method has certain destructiveness and belongs to a destructive detection method. The degradation degree detection method of the motor winding can effectively solve the problems.
In one embodiment, as shown in fig. 1, there is provided a degradation detection method of a motor winding, including the steps of:
s110, LCR parameters of the motor winding to be tested under each preset test frequency are obtained;
wherein the LCR parameters include any one or any combination of the following: inductance, capacitance, resistance, phase angle, loss, and impedance. The motor winding to be tested comprises a motor stator winding and a motor rotor winding. The preset test frequency is the output current frequency when the motor winding to be tested is tested.
Specifically, any means in the art may be used to obtain LCR parameters of the motor winding to be tested at each preset test frequency. In a specific example, the motor winding to be tested may be detected by an LCR tester, so as to obtain LCR parameters. Under the condition that the motor winding to be detected comprises a motor stator winding and a motor rotor winding, the motor stator winding and the motor rotor winding can be detected respectively to obtain LCR parameters of the motor stator winding and the motor rotor winding. And testing by adopting each preset test frequency to obtain LCR parameters of the motor stator winding under each preset test frequency, and LCR parameters of the electronic rotor winding under each preset test frequency. In one embodiment, each preset test frequency falls within the interval of 20Hz to 10 MHz.
S120, generating a frequency spectrum characteristic curve according to each LCR parameter and a corresponding preset test frequency;
specifically, the spectral characteristic curve may be generated by any means according to each LCR parameter and a corresponding preset test frequency. That is, each LCR parameter has a corresponding preset test frequency, and then the test frequency is taken as the X axis, and the LCR parameter is taken as the Y axis, so as to generate a spectrum characteristic curve. If the LCR parameters are of various kinds, that is, the LCR parameters may include inductance, resistance, capacitance, and the like, a plurality of spectral characteristics are generated. Such as inductance-frequency curves, resistance-frequency curves, capacitance-frequency curves, phase angle-frequency curves, loss-frequency curves, and impedance-frequency curves. In one specific example, the spectral characteristic is an impedance spectral curve.
S130, extracting a curve of a preset frequency band in the frequency spectrum characteristic curve, and acquiring a maximum parameter value according to the curve of the preset frequency band;
specifically, the step of extracting a curve of a preset frequency band in the spectrum characteristic curve and obtaining the maximum parameter value according to the curve of the preset frequency band may include: according to each spectrum characteristic curve, acquiring a specific spectrum characteristic curve with the most characteristic information; and extracting a curve of a preset frequency band in the specific frequency characteristic curve, and acquiring a maximum parameter value according to the curve of the preset frequency band. In a specific example, the specific spectral characteristic curve that contains the most characteristic information is an impedance spectral curve.
In another embodiment, the step of extracting a curve of a preset frequency band in the spectrum characteristic curve and obtaining the maximum parameter value according to the curve of the preset frequency band may include: and respectively extracting curves of preset frequency bands in the inductance-frequency curve, the resistance-frequency curve, the capacitance-frequency curve, the phase angle-frequency curve, the loss-frequency curve and the impedance-frequency curve, and then respectively obtaining corresponding maximum parameter values. It should be noted that the preset frequency band may be obtained according to the specific spectrum characteristic curve, for example, a frequency band with the largest variation of the parameter value is selected. In a specific example, the preset frequency band is 10 5 -10 6 . Further, the maximum parameter value in the curve of the preset frequency band may be obtained by any means in the art, which is not specifically limited herein.
And S140, processing the maximum parameter value and a preset reference value to obtain the degradation degree of the motor winding to be detected.
Specifically, the maximum parameter value may be processed by any means and a preset reference value. In a specific example, the step of processing the maximum parameter value and the preset reference value to obtain the degradation degree of the motor winding to be tested may include: and processing the maximum parameter value and a preset reference value in the specific frequency spectrum characteristic curve to obtain the degradation degree. The preset reference value corresponds to a parameter of a specific spectral characteristic curve. If the specific frequency spectrum curve is an inductance-frequency curve, presetting a reference value as the reference value of the inductance; if the specific frequency spectrum curve is a resistance-frequency curve, presetting a reference value as the reference value of the resistance; if the specific frequency spectrum curve is a capacitance-frequency curve, presetting a reference value as the reference value of the capacitance; if the specific frequency spectrum curve is a phase angle-frequency curve, presetting a reference value as a reference value of a phase angle; if the specific frequency spectrum curve is a loss-frequency curve, presetting a reference value as a reference value of loss; if the specific spectrum curve is an impedance-frequency curve, the preset reference value is the reference value of the impedance. In a specific example, in the step of processing the maximum parameter value and the preset reference value to obtain the degradation degree of the motor winding to be measured, the degradation degree is obtained based on the following formula:
wherein DD is the degree of degradation; z is Z max Is the maximum parameter value; z is Z 0max Is a preset reference value.
In another specific example, the step of processing the maximum parameter value and the preset reference value to obtain the degradation degree of the motor winding to be measured may include:
processing the maximum parameter value of the inductance-frequency curve and the inductance reference value to obtain a first degradation degree; processing the maximum parameter value of the resistance-frequency curve and the resistance reference value to obtain a second degradation degree; processing the maximum parameter value of the capacitance-frequency curve and the capacitance reference value to obtain a third degradation degree; processing the maximum parameter value and the phase angle reference value of the phase angle-frequency curve to obtain a fourth degradation degree; processing the maximum parameter value of the loss-frequency curve and the loss reference value to obtain a fifth degradation degree; processing the maximum parameter value of the impedance-frequency curve and the impedance reference value to obtain a sixth degradation degree; and then processing the first degradation degree, the second degradation degree, the third degradation degree, the fourth degradation degree, the fifth degradation degree and the sixth degradation degree to obtain the degradation degree of the motor winding to be tested. The step of processing the first degradation degree, the second degradation degree, the third degradation degree, the fourth degradation degree, the fifth degradation degree, and the sixth degradation degree may be processed by any data means, for example, an average value of the degradation degrees is taken as the degradation degree of the motor winding.
The degradation degree detection method of the motor winding makes up for the gap of the degradation degree detection method of the direct-current traction motor winding. Compared with the traditional testing means, the nondestructive measurement of the degradation degree of the motor winding can be realized; this method contains more information than the dielectric parameter test method at a single frequency. Meanwhile, according to LCR spectrum characteristic analysis, a data evaluation system of the degradation degree of the traction motor winding can be perfected, train overhaul service can be better provided, reference can be provided for optimization of locomotive overhaul regulations, and finally the purpose of state overhaul is achieved.
In one embodiment, as shown in fig. 2, there is provided a step of acquiring a preset reference value, including:
s210, acquiring blank LCR parameters of a new machine under each preset test frequency;
specifically, the blank LCR parameters include any one or any combination of the following parameters: inductance, capacitance, resistance, phase angle, loss, and impedance. Specifically, any means in the art may be used to obtain LCR parameters of the new machine at each preset test frequency. In a specific example, the motor winding to be tested may be detected by an LCR tester, so as to obtain LCR parameters. Under the condition that the motor winding to be detected comprises a motor stator winding and a motor rotor winding, the motor stator winding and the motor rotor winding can be detected respectively to obtain LCR parameters of the motor stator winding and the motor rotor winding.
S220, generating a blank frequency spectrum characteristic curve according to each blank LCR parameter and a corresponding preset test frequency;
specifically, a spectrum characteristic curve can be generated by any means according to each blank LCR parameter and a corresponding preset test frequency. That is, each blank LCR parameter has a corresponding preset test frequency, and then the test frequency is taken as the X axis, and the blank LCR parameter is taken as the Y axis, so as to generate a spectrum characteristic curve. If the types of the blank LCR parameters are multiple, that is, the blank LCR parameters may include inductance, resistance, capacitance, and the like, multiple spectrum characteristic curves are generated.
S230, extracting a blank curve of a preset frequency band in the blank spectrum characteristic curve, and acquiring a preset reference value according to the blank curve.
Specifically, the step of extracting a blank curve of a preset frequency band in the blank spectrum characteristic curve and acquiring a preset reference value according to the blank curve may include: acquiring a reference spectrum characteristic curve with the most characteristic information according to each blank spectrum characteristic curve; and extracting a blank curve of a preset frequency band in the reference frequency characteristic curve, and acquiring a preset reference value according to the blank curve of the preset frequency band.
In another embodiment, the step of extracting a blank curve of a preset frequency band in the blank spectrum characteristic curve and obtaining the preset reference value according to the blank curve may include: and respectively extracting blank curves of preset frequency bands in the inductance-frequency curve, the resistance-frequency curve, the capacitance-frequency curve, the phase angle-frequency curve, the loss-frequency curve and the impedance-frequency curve, and then respectively obtaining preset reference values corresponding to the blank curves. Furthermore, when the maximum parameter value and each preset reference value are processed, the type of the maximum parameter value is only needed to be judged, and the maximum parameter value and the preset reference values of the same type are processed. That is, if the maximum parameter value is the resistance parameter, the preset reference value is also obtained from the resistance-frequency curve and corresponds to the resistance parameter.
It should be noted that the preset frequency band may be obtained according to the specific spectrum characteristic curve, for example, a frequency band with the largest variation of the parameter value is selected.
In one embodiment, the step of obtaining LCR parameters of the motor winding to be tested at each preset test frequency includes:
outputting an instruction to the LCR measuring instrument; the instruction is used for instructing the LCR measuring instrument to set the output frequency according to each preset test frequency, and respectively obtaining LCR parameters corresponding to each preset test frequency after the setting is completed.
Specifically, the LCR parameters under each preset test frequency are obtained by controlling the test of an LCR measuring instrument. The LCR measuring instrument sets the output frequency as each preset test frequency according to the instruction, and tests by adopting each preset test frequency to obtain each LCR parameter.
It should be understood that, although the steps in the flowcharts of fig. 1-2 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1-2 may include multiple sub-steps or phases that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or phases are performed necessarily occur sequentially, but may be performed alternately or alternately with at least a portion of the sub-steps or phases of other steps or other steps.
In one embodiment, as shown in fig. 3, there is provided a degradation detection device of a motor winding, including:
the acquisition module is used for acquiring LCR parameters of the motor winding to be tested under each preset test frequency;
the curve generation module is used for generating a frequency spectrum characteristic curve according to each LCR parameter and the corresponding preset test frequency;
the extraction module is used for extracting a curve of a preset frequency band in the frequency spectrum characteristic curve and acquiring a maximum parameter value according to the curve of the preset frequency band;
and the degradation degree generation module is used for processing the maximum parameter value and a preset reference value to obtain the degradation degree of the motor winding to be detected.
In one embodiment, there is provided a degradation degree detection device for a motor winding, further comprising:
the parameter acquisition module is used for acquiring blank LCR parameters of the new machine under each preset test frequency;
the blank curve generation module is used for generating a blank frequency spectrum characteristic curve according to each blank LCR parameter and the corresponding preset test frequency;
the reference value acquisition module is used for extracting a blank curve of the preset frequency band in the blank frequency spectrum characteristic curve and acquiring the preset reference value according to the blank curve.
The specific limitation regarding the degradation degree detection device may be referred to as limitation of the degradation degree detection method hereinabove, and will not be described herein. Each of the modules in the degradation degree detection device described above may be implemented in whole or in part by software, hardware, or a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, as shown in fig. 4, the embodiment of the application further provides degradation detection equipment of the motor winding, which comprises an LCR measuring instrument for detecting the motor winding to be detected, a processor and a memory; the memory stores a computer program; the steps of any of the methods described above are carried out by the processor when executing the computer program.
The LCR meter may be any LCR meter in the art, and the type and the like are not limited herein. In one example, a processor obtains LCR parameters of a motor winding to be tested at each preset test frequency; then the processor generates a frequency spectrum characteristic curve according to each LCR parameter and the corresponding preset test frequency; the processor extracts a curve of a preset frequency band in the frequency spectrum characteristic curve, and acquires a maximum parameter value according to the curve of the preset frequency band; and finally, the processor processes the maximum parameter value and a preset reference value to obtain the degradation degree of the motor winding to be tested.
In one embodiment, as shown in fig. 5, the motor winding tester further comprises a test box for containing the motor winding to be tested, a temperature sensor for detecting the temperature inside the test box and a humidity sensor for detecting the humidity inside the test box.
Specifically, the test box is used for enabling the motor winding to be tested to keep consistency of temperature and humidity in the test process, so that inaccuracy of LCR parameters caused by environmental factors is avoided.
To further illustrate the degradation detection method of the present application, the following is further described with reference to a specific example:
specifically, the degradation degree detection method includes the steps of:
the first step: test prototype selection
As shown in FIG. 6, the test subjects were selected as ZD114A type traction motors 5, direct current traction motors before and after the overhaul of an SS4B electric locomotive were selected, and before the test was started, the motor windings 4 were first subjected to pretreatment cleaning and dust removal work to obtain motor windings 4 with different degradation degrees, and the prototypes before the overhaul were divided into eight groups, designated by numbers 1# (2006 06-17), 2# (2006 05-38), 3# (2008 05-057), 4# (2008 05-044), 5# (2006 03-05), 6# (2004 12-090), 7# (2008 05-001) and 8# (2006 05-34), respectively.
And a second step of: LCR parameter determination of test prototype
The testing prototype is placed in a large-scale testing box 1 capable of measuring temperature and humidity, the temperature sensor 6 and the humidity sensor 7 are adopted to measure the current ambient temperature and humidity, and the LCR measuring instrument 3 is matched with a connecting wire and the clamp 2 to measure and calculate the inductance L, the capacitance C, the resistance R, the PHASE angle PHASE, the loss D and the impedance Z of the stator winding of the testing prototype at 20 Hz-10 MHz and 1V. The instruments required for the test are as follows: the LCR tester 3 has the test frequency of 20 Hz-10 MHz, the measurement driving level of 10 mV-2V, the basic measurement accuracy of 0.1 percent and the model of LCR-8110G. And the large-scale test box 1 is used for standing and storing a test sample machine, so that the environment of the sample machine is ensured to be good as much as possible, and the dust-proof level reaches the standard. And the temperature sensor 6 is used for collecting the environmental temperature data of the stator winding of the test prototype and measuring the environmental temperature. Humidity sensor 7: the method is used for collecting the environmental humidity data of the stator winding of the test prototype and measuring the environmental humidity. Connecting wire and clamp 2: for connecting the LCR meter 3 and the test pattern stator winding such that the LCR meter 3 and the test pattern stator winding are reliably connected.
And a third step of: prototype winding degradation determination
The method comprises the steps of combining the ambient temperature measured by a temperature sensor 6 and the ambient humidity measured by a humidity sensor 7, selecting a test frequency range of 20 Hz-10 MHz, obtaining LCR frequency spectrum response data and characteristic curves of eight groups of test motor stator windings before overhaul at different frequencies (for convenience of explanation, the corresponding frequency spectrums of the traction motor stator windings are shown as a figure 7, a figure 8, a figure 9, a figure 10, a figure 11 and a figure 12, namely a resistance frequency spectrum, an inductance frequency spectrum, a capacitance frequency spectrum, a phase angle frequency spectrum, a loss frequency spectrum and an impedance frequency spectrum, and comparing to find hidden resistance, inductance, capacitance, phase angle and loss parameter information in the impedance frequency spectrum, and the phase angle and the loss parameter are easy to be interfered by other operation equipment in a factory building in the test process, so that the characteristic parameter which can reflect the insulation degradation degree of the traction motor, namely the impedance frequency spectrum, is selected as an effective characteristic parameter of insulation degradation of the traction motor.
In addition, after the overhaul of the test motor, LCR frequency spectrum data and characteristic curves of the overhauled motor stator winding under different frequencies are acquired again, real-time ambient temperature and ambient humidity are acquired, the influence of the temperature and the humidity on the overhauled motor is avoided, the LCR frequency spectrum characteristic curves of the test motor stator winding before and after the overhaul are compared with a blank new machine, and the degradation degree of the direct-current traction motor winding 4 is judged. Fig. 13 shows the impedance spectrum of the stator winding of the traction motor before overhaul, and it can be seen from the graph that the curve basically changes little in the low frequency band, mainly in the high frequency band (10 4 -10 7 ) Significantly change, especially at 10 5 -10 6 Most notably, peaks occur and are subject to interference from other operating equipment within the plant at low frequency bands. The law of the blank new machine is similar to the above, but the peak value of the blank new machine is higher in the characteristic frequency band, and can reach 1600 omega. For this purpose, a high-band curve-10 in the impedance spectrum is extracted 5 -10 6 And a curve of the frequency band, wherein peak parameters such as the frequency band are used as characteristic parameters, and the insulation degradation degree of the traction motor is determined according to the curve. In addition, the analysis shows that the aging degree gradually increases as the running time of the traction motor increases, and the high-frequency impedance peak value gradually decreases along with the aging degree. Accordingly, the determined traction motor insulation degradation degree DD is shown in formula 1.
Wherein Z is max The stator winding of the traction motor is in the characteristic frequency band 10 before overhaul 5 -10 6 Maximum peak value of Z 0max Is a novel traction motor stator winding in a characteristic frequency band 10 5 -10 6 Is defined as the maximum peak of (a). Further, the degree of degradation of the insulation of the traction motor rotor winding can also be determined based on this principle.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 14. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured 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 computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a degradation degree detection method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in fig. 14 is merely a block diagram of a portion of the structure associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements are applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:
obtaining LCR parameters of a motor winding to be tested under each preset test frequency;
generating a frequency spectrum characteristic curve according to each LCR parameter and the corresponding preset test frequency;
extracting a curve of a preset frequency band in the frequency spectrum characteristic curve, and acquiring a maximum parameter value according to the curve of the preset frequency band;
and processing the maximum parameter value and a preset reference value to obtain the degradation degree of the motor winding to be detected.
In one embodiment, the processor when executing the computer program further performs the steps of:
acquiring blank LCR parameters of the new machine under each preset test frequency;
generating a blank frequency spectrum characteristic curve according to each blank LCR parameter and a corresponding preset test frequency;
and extracting a blank curve of a preset frequency range in the blank frequency spectrum characteristic curve, and acquiring a preset reference value according to the blank curve.
In one embodiment, the processor when executing the computer program further performs the steps of:
outputting an instruction to the LCR measuring instrument; the instruction is used for instructing the LCR measuring instrument to set the output frequency according to each preset test frequency, and respectively obtaining LCR parameters corresponding to each preset test frequency after the setting is completed.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
obtaining LCR parameters of a motor winding to be tested under each preset test frequency;
generating a frequency spectrum characteristic curve according to each LCR parameter and the corresponding preset test frequency;
extracting a curve of a preset frequency band in the frequency spectrum characteristic curve, and acquiring a maximum parameter value according to the curve of the preset frequency band;
and processing the maximum parameter value and a preset reference value to obtain the degradation degree of the motor winding to be detected.
In one embodiment, the computer program when executed by the processor further performs the steps of:
acquiring blank LCR parameters of the new machine under each preset test frequency;
generating a blank frequency spectrum characteristic curve according to each blank LCR parameter and a corresponding preset test frequency;
and extracting a blank curve of a preset frequency range in the blank frequency spectrum characteristic curve, and acquiring a preset reference value according to the blank curve.
In one embodiment, the computer program when executed by the processor further performs the steps of:
outputting an instruction to the LCR measuring instrument; the instruction is used for instructing the LCR measuring instrument to set the output frequency according to each preset test frequency, and respectively obtaining LCR parameters corresponding to each preset test frequency after the setting is completed.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus dynamic random access memory (RDRAM), and interface dynamic random access memory (DRDRAM).
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A degradation degree detection method of a motor winding, characterized by comprising the steps of:
obtaining LCR parameters of a motor winding to be tested under each preset test frequency;
generating a frequency spectrum characteristic curve according to each LCR parameter and the corresponding preset test frequency;
extracting a curve of a preset frequency band in the frequency spectrum characteristic curve, and acquiring a maximum parameter value according to the curve of the preset frequency band;
processing the maximum parameter value and a preset reference value to obtain the degradation degree of the motor winding to be detected;
the extracting the curve of the preset frequency band in the frequency spectrum characteristic curve, and obtaining the maximum parameter value according to the curve of the preset frequency band comprises the following steps: according to each frequency spectrum characteristic curve, a specific frequency spectrum characteristic curve with the most characteristic information is obtained, a curve of a preset frequency band in the specific frequency spectrum characteristic curve is extracted, and a maximum parameter value is obtained according to the curve of the preset frequency band.
2. The degradation detection method of a motor winding according to claim 1, further comprising the step of:
acquiring blank LCR parameters of the new machine under each preset test frequency;
generating a blank frequency spectrum characteristic curve according to each blank LCR parameter and the corresponding preset test frequency;
and extracting a blank curve of the preset frequency band in the blank frequency spectrum characteristic curve, and acquiring the preset reference value according to the blank curve.
3. The method of claim 1, wherein the step of obtaining LCR parameters of the motor winding to be tested at each preset test frequency comprises:
outputting an instruction to the LCR measuring instrument; the instruction is used for instructing the LCR measuring instrument to set an output frequency according to each preset test frequency, and respectively obtaining the LCR parameters corresponding to each preset test frequency after the setting is completed.
4. The degradation degree detection method of a motor winding according to claim 1, wherein in the step of processing the maximum parameter value and a preset reference value to obtain the degradation degree of the motor winding to be detected, the degradation degree is obtained based on the following formula:
wherein DD is the degree of degradation; z is Z max Is the maximum parameter value; z is Z 0max And the preset reference value is obtained.
5. The method of claim 1, wherein the LCR parameters include any one or any combination of the following: inductance, capacitance, resistance, phase angle, loss, and impedance.
6. The degradation detection method of a motor winding according to claim 1, wherein each preset test frequency falls within a range of 20Hz to 10 MHz.
7. A degradation degree detection device for a motor winding, comprising:
the acquisition module is used for acquiring LCR parameters of the motor winding to be tested under each preset test frequency;
the curve generation module is used for generating a frequency spectrum characteristic curve according to each LCR parameter and the corresponding preset test frequency;
the extraction module is used for extracting a curve of a preset frequency band in the frequency spectrum characteristic curve and acquiring a maximum parameter value according to the curve of the preset frequency band;
the degradation degree generation module is used for processing the maximum parameter value and a preset reference value to obtain the degradation degree of the motor winding to be detected;
the extraction module is specifically configured to obtain a specific spectrum characteristic curve with the most characteristic information according to each spectrum characteristic curve, extract a curve of a preset frequency band in the specific spectrum characteristic curve, and obtain a maximum parameter value according to the curve of the preset frequency band.
8. The degradation degree detection device for the motor winding is characterized by comprising an LCR measuring instrument for detecting the motor winding to be detected, a processor and a memory; the memory stores a computer program; the processor, when executing the computer program, implements the steps of the method of any one of claims 1 to 6.
9. The degradation degree detection apparatus of a motor winding according to claim 8, further comprising a test box for accommodating the motor winding to be measured, a temperature sensor for detecting an internal temperature of the test box, and a humidity sensor for detecting an internal humidity of the test box.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
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