CN113820600B - Alternating current resistance testing system, method and device and computer readable storage medium - Google Patents
Alternating current resistance testing system, method and device and computer readable storage medium Download PDFInfo
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- CN113820600B CN113820600B CN202111408626.2A CN202111408626A CN113820600B CN 113820600 B CN113820600 B CN 113820600B CN 202111408626 A CN202111408626 A CN 202111408626A CN 113820600 B CN113820600 B CN 113820600B
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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
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Abstract
The embodiment of the invention discloses an alternating current resistance testing system, a method, a device and a computer readable storage medium, which are applied to a stator in a high-speed motor, wherein the stator comprises a ferrite magnetic core and a three-phase winding, the system comprises a processor, a power analysis unit, a three-phase alternating current power supply and a temperature sensor which is respectively arranged in each phase winding, the three-phase alternating current power supply is electrically connected with a winding terminal of the three-phase winding through the power analysis unit, the processor is used for receiving real-time data sent back by the temperature sensor and the power analysis unit under the condition of controlling the three-phase alternating current power supply to output a plurality of groups of voltage signals of measuring frequency, the alternating current resistance of the stator is tested, the ferrite magnetic core is used for replacing a silicon steel sheet iron core, the iron loss of the stator iron core generated in the alternating current resistance testing of the motor can be effectively avoided, and more accurate alternating current resistance can be obtained, to calculate the copper loss of the motor.
Description
Technical Field
The invention relates to the technical field of motor testing, in particular to a system, a method and a device for testing alternating current resistance and a computer readable storage medium.
Background
Because the motor winding has skin effect and proximity effect under the condition of alternating current, additional loss is generated, which is reflected in the phenomenon that the alternating current resistance increases along with the increase of the frequency. However, when the winding is energized, a magnetic field which changes with time is generated in the iron core, and the magnetic field generates iron loss in the iron core, so that the tested alternating current resistor contains a resistor corresponding to the iron loss, and the result of actually calculated large copper loss of the motor is caused.
When the high-speed motor is applied, because the frequency is obviously increased, the skin effect and the proximity effect of a winding are very obvious, and the extra copper loss is obviously increased. Therefore, the method can result in underestimating the actual copper loss and cause the result of inaccurate motor efficiency calculation.
Therefore, a testing method capable of eliminating the skin effect and the proximity effect and accurately calculating the ac resistance of the motor is needed.
Disclosure of Invention
In order to solve the above technical problem, the present application provides an ac resistance testing system, method, apparatus, and computer-readable storage medium, and the specific scheme is as follows:
in a first aspect, an embodiment of the present disclosure provides an ac resistance testing system, which is applied to a stator in a high-speed motor, where the stator includes a ferrite core and three-phase windings, and each phase winding is sleeved with a corresponding temperature sensor, where the system includes: the device comprises a processor, a power analysis unit, a three-phase alternating current power supply and a temperature sensor which is respectively arranged in each phase winding;
the three-phase alternating current power supply is electrically connected with winding terminals of the three-phase winding through the power analysis unit;
the processor is respectively in communication connection with the temperature sensor, the power analysis unit and the three-phase alternating-current power supply;
the processor is configured to:
sending a starting signal to the three-phase alternating-current power supply so that the three-phase alternating-current power supply outputs a plurality of groups of measurement voltage signals to the stator, wherein the measurement frequencies of the plurality of groups of measurement voltage signals are increased progressively according to a preset step length;
acquiring a resistance correlation value corresponding to a measurement voltage signal at each measurement frequency, and calculating an alternating current resistance multiple at the corresponding measurement frequency according to the resistance correlation value, wherein the resistance correlation value comprises an alternating current phase resistance and a direct current phase resistance corresponding to the temperature of a stator;
fitting according to the AC resistance multiple corresponding to all the measurement frequencies to generate an AC resistance multiple curve;
and calculating a target alternating current resistance corresponding to a preset target frequency according to the alternating current resistance multiple curve.
In a second aspect, an embodiment of the present disclosure further provides an ac resistance testing method applied to a processor in the ac resistance testing system of the first aspect, where the method includes:
sending a starting signal to the three-phase alternating-current power supply so that the three-phase alternating-current power supply outputs a plurality of groups of measurement voltage signals to the stator, wherein the measurement frequencies of the plurality of groups of measurement voltage signals are increased progressively according to a preset step length;
acquiring a resistance correlation value corresponding to a measurement voltage signal at each measurement frequency, and calculating an alternating current resistance multiple at the corresponding measurement frequency according to the resistance correlation value, wherein the resistance correlation value comprises an alternating current phase resistance and a direct current phase resistance corresponding to the temperature of a stator;
fitting according to the AC resistance multiple corresponding to all the measurement frequencies to generate an AC resistance multiple curve;
and calculating a target alternating current resistance corresponding to a preset target frequency according to the alternating current resistance multiple curve.
According to a specific implementation manner of the embodiment of the present disclosure, the step of obtaining the resistance correlation value corresponding to the measured voltage signal at each measurement frequency includes:
acquiring the three-phase total power and the three-phase current average effective value acquired by the power analysis unit;
calculating an alternating current phase resistance according to the three-phase total power, the three-phase current average effective value and a preset alternating current resistance formula;
acquiring the temperature of each phase winding acquired by the temperature sensor, and taking the average value of the three-phase winding temperature as the stator temperature;
calculating direct-current phase resistance according to the resistance temperature coefficient of the winding, the stator temperature and direct-current resistance between three-phase winding terminals;
according to a specific implementation manner of the embodiment of the disclosure, the measurement voltage signal output by the three-phase alternating-current power supply is a sine wave, the harmonic content is not more than 0.5%, and the three phases are different from each other by 120 electrical angles.
According to a specific implementation manner of the embodiment of the present disclosure, the calculation formula of the ac phase resistance is:
wherein the content of the first and second substances,R(f i) Is an alternating-current phase resistor, and is provided with a resistor,P ithe total power of the three phases is,I iis the average effective value of the three-phase current,f ifor measuring frequency, i is a positive integer.
According to a specific implementation manner of the embodiment of the present disclosure, the calculation formula of the ac resistance multiple is:
wherein the content of the first and second substances,k ac(f i) Is a multiple of the alternating-current resistance,R dciis a direct-current phase resistor, and is provided with a resistor,R(f i) Is an alternating-current phase resistor, and is provided with a resistor,f ifor measuring frequency, i is a positive integer.
In a third aspect, an embodiment of the present disclosure provides an ac resistance testing apparatus, which is applied to a processor in the ac resistance testing system of the first aspect, where the apparatus includes:
the starting module is used for sending a starting signal to the three-phase alternating-current power supply so that the three-phase alternating-current power supply outputs a group of measuring voltage signals to the stator, wherein the measuring frequency of the measuring voltage signals is increased progressively according to a preset step length;
the acquisition module is used for acquiring a resistance correlation value corresponding to the measurement voltage signal at each measurement frequency and calculating an alternating current resistance multiple at the corresponding measurement frequency according to the resistance correlation value, wherein the resistance correlation value comprises an alternating current phase resistance and a direct current phase resistance corresponding to the temperature of the stator;
the generating module is used for generating an alternating current resistance multiple curve according to alternating current resistance multiple fitting corresponding to all the measuring frequencies;
and the calculation module is used for calculating a target alternating current resistance corresponding to a preset target frequency according to the alternating current resistance multiple curve.
In a fourth aspect, the disclosed embodiments also provide a high-speed electric machine, including a processor and a memory, where the memory stores a computer program, and the computer program executes the ac resistance testing method according to the second aspect when running on the processor.
According to a specific implementation of an embodiment of the present disclosure, a stator of the high-speed electric machine includes a ferrite core and a three-phase winding;
the ferrite magnetic core is made of at least one of manganese zinc ferrite or nickel zinc ferrite.
In a fifth aspect, the disclosed embodiments also provide a computer-readable storage medium, in which a computer program is stored, and when the computer program runs on a processor, the computer program executes the ac resistance testing method according to the second aspect.
The disclosed embodiment provides an alternating current resistance testing system, a method, a device and a computer readable storage medium, which are applied to a stator in a high-speed motor, wherein the stator comprises a ferrite magnetic core and a three-phase winding, the system comprises a processor, a power analysis unit, a three-phase alternating current power supply and a temperature sensor which is respectively arranged in each phase winding, the three-phase alternating current power supply is electrically connected with a winding terminal of the three-phase winding through the power analysis unit, the processor is respectively in communication connection with the temperature sensor, the power analysis unit and the three-phase alternating current power supply, the processor sends a starting signal to the three-phase alternating current power supply so that the three-phase alternating current power supply outputs a group of measuring voltage signals to the stator, and the measuring frequency of the measuring voltage signals increases progressively according to a preset step length; acquiring an alternating-current phase resistor at each measuring frequency and a direct-current phase resistor corresponding to the temperature of the stator; calculating the AC resistance multiple according to the AC phase resistance and the DC phase resistance; fitting according to the AC resistance multiple under all the measurement frequencies to generate an AC resistance multiple curve; according to the alternating current resistance multiple curve and the preset target frequency, the target alternating current resistance is calculated, the ferrite magnetic core is adopted to replace a silicon steel sheet iron core, the iron loss of the stator iron core generated in the alternating current resistance test of the motor can be effectively avoided, the mutual influence of the three-phase symmetrical winding when symmetrical current is conducted can be reflected, and therefore more accurate alternating current resistance is obtained, and the copper loss of the motor is calculated.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 is a schematic system structure diagram of an ac resistance testing system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram illustrating a ferrite core of a stator of a high-speed motor according to an embodiment of the present disclosure;
fig. 3 shows a flowchart of a method of an ac resistance testing method according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram illustrating an ac multiple resistance curve in an ac resistance testing method according to an embodiment of the present disclosure;
fig. 5 shows an apparatus block diagram of an ac resistance testing apparatus according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In a traditional high-speed motor, a stator of the motor usually comprises a stator core, a stator winding and a base, when a winding is electrified, a magnetic field which changes along with time can be generated in the stator core, the magnetic field generates iron loss in the stator core made of silicon steel sheets, and therefore the tested alternating current resistor contains a resistor corresponding to the iron loss, and the accuracy of the measured alternating current resistor is influenced.
Referring to fig. 1, an embodiment of the present disclosure provides an ac resistance testing system applied to a stator in a high-speed motor, where the stator includes a ferrite core and three-phase windings, and each phase winding is sleeved with a corresponding temperature sensor, as shown in fig. 1, the ac resistance testing system includes: a processor 110, a power analysis unit 120, a three-phase alternating current power supply 130 and a temperature sensor respectively built in each phase winding;
the three-phase ac power supply 130 is configured to be electrically connected to the winding terminals of the three-phase winding through the power analysis unit 120;
the processor 110 is respectively connected to the temperature sensor, the power analysis unit 120 and the three-phase ac power supply 130 in communication;
the processor 110 is configured to: sending a starting signal to the three-phase alternating-current power supply 130 so that the three-phase alternating-current power supply 130 outputs a plurality of groups of measurement voltage signals to the stator, wherein the measurement frequencies of the plurality of groups of measurement voltage signals are increased progressively according to a preset step length; acquiring a resistance correlation value corresponding to a measurement voltage signal at each measurement frequency, and calculating an alternating current resistance multiple at the corresponding measurement frequency according to the resistance correlation value, wherein the resistance correlation value comprises an alternating current phase resistance and a direct current phase resistance corresponding to the temperature of a stator; fitting according to the AC resistance multiple corresponding to all the measurement frequencies to generate an AC resistance multiple curve; and calculating a target alternating current resistance corresponding to a preset target frequency according to the alternating current resistance multiple curve.
In this embodiment, the stator of the high-speed motor adopts a ferrite core instead of a conventional stator core, as shown in parts (1) and (2) in fig. 2, where part (1) in fig. 2 is a schematic side view of the ferrite core, and part (2) in fig. 2 is a schematic top view of the ferrite core, the specification of the ferrite core and the specification of the stator core are kept consistent, and may be 112mm in inner diameter, 259.9mm in outer diameter, and 165mm in height, or may be set according to actual needs, and the dimensions are not specifically limited herein.
The ferrite core can be made of manganese-zinc ferrite or nickel-zinc ferrite, and has very high resistivity, so that the iron loss under an alternating current magnetic field can be ignored when an alternating current resistance test is carried out, and the accuracy of the alternating current resistance value is ensured.
In a specific production and processing scene, the ferrite magnetic core can also be replaced by a material with high resistivity, such as amorphous alloy or bonded magnetic powder core.
The ferrite core still is provided with the stator slot, the quantity of stator slot is the integral multiple of 3 place the three-phase winding in the stator slot, the three-phase winding can adopt Y to connect or triangle-shaped mode line inserting in the stator slot of ferrite core.
It is noted that a temperature sensor is embedded in the process of winding off each phase, and is arranged in the middle of the stator slot, wherein the type of the temperature sensor can be PT100 type, and the type of the temperature sensor is not specifically limited herein.
As shown in fig. 1, three-phase terminals of the three-phase winding are a terminal a, a terminal B, and a terminal C, the three-phase terminals are all electrically connected to a signal output terminal of the power analysis unit 120, and a signal input terminal of the power analysis unit 120 is electrically connected to the three-phase ac power supply 130, where the power analysis unit 120 is a power analyzer capable of testing three-phase power and three-phase current, and the three-phase ac power supply 130 is an ac power supply with adjustable output frequency.
Specifically, the power analysis unit 120 may also use other instrumentation capable of measuring three-phase power and three-phase current, and is not limited herein.
The processor 110 is communicatively connected to a power analysis unit 120, a three-phase ac power supply 130, and a temperature sensor disposed in the ferrite core stator slots, respectively, for transmitting, receiving, and processing signals.
The processor 110 controls the frequency-adjustable three-phase alternating-current power supply 130 to output a plurality of sets of measurement voltage signals to the stator so as to control the high-speed motor to start working, wherein the measurement frequencies of the plurality of sets of measurement voltage signals are increased progressively according to a preset step length until the measurement frequency reaches a preset highest frequency. And carrying out one-time alternating current resistance test under each group of measurement voltage signals.
And under each measuring frequency, calculating an alternating current phase resistor and a direct current phase resistor corresponding to the temperature of the stator, and calculating an alternating current resistance multiple corresponding to the measuring frequency according to the alternating current phase resistor and the direct current phase resistor. And generating a corresponding alternating current resistance multiple curve according to the alternating current resistance multiple fitting under all the measurement frequencies, namely performing any interpolation on the curve to obtain the alternating current resistance under any frequency, and calculating the copper loss under high frequency by using the alternating current resistance obtained by the test.
The alternating current resistance testing system provided by the embodiment can reflect the mutual influence of the three-phase symmetrical winding when symmetrical current is applied through the testing method of the three-phase alternating current power supply 130, so that the corresponding alternating current resistance can be accurately tested, and the tested alternating current resistance is applied to the calculation of the copper loss of the motor, so that the accuracy of the calculation of the copper loss of the motor can be ensured.
Referring to fig. 3, an embodiment of the present disclosure further provides an ac resistance testing method applied to the processor 110 in the ac resistance testing system according to the first aspect, where the method includes:
s301, sending a start signal to the three-phase ac power supply 130, so that the three-phase ac power supply 130 outputs a plurality of sets of measurement voltage signals to the stator, wherein the measurement frequencies of the plurality of sets of measurement voltage signals are increased progressively according to a preset step length;
specifically, the step of controlling the three-phase ac power supply 130 by the processor 110 may refer to the above embodiments, and is not described herein again.
In a specific embodiment, the measurement frequency of the multiple sets of measurement voltage signals may be increased in steps of 10Hz from 10Hz until the measurement frequency increases to a maximum frequency of 500Hz, and of course, the starting value, the maximum value, and the preset step of the measurement frequency may be set according to actual needs of the motor, which is not limited herein.
Further, it is ensured that the voltage signal output by the three-phase ac power supply 130 is a sine wave, the harmonic content is not greater than 0.5%, and the three phases differ from each other by 120 electrical angles, so that the voltage signal output by the frequency-adjustable three-phase ac power supply 130 is more stable, and the accuracy of the ac phase resistance and the dc phase resistance measured under the voltage signal of each measured frequency is ensured.
S302, obtaining a resistance correlation value corresponding to a measurement voltage signal under each measurement frequency, and calculating an alternating current resistance multiple under the corresponding measurement frequency according to the resistance correlation value, wherein the resistance correlation value comprises an alternating current phase resistance and a direct current phase resistance corresponding to the temperature of a stator;
when the three-phase ac power source 130 outputs a set of measured voltage signals corresponding to the measured frequency, the processor 110 may calculate the resistance related value according to the temperature data and the motor data transmitted back by the temperature sensor and the power analysis unit 120, where the motor data includes three-phase power and three-phase current.
Specifically, the step of obtaining the resistance correlation value corresponding to the measurement voltage signal at each measurement frequency includes:
acquiring the three-phase total power and the three-phase current average effective value collected by the power analysis unit 120;
calculating an alternating current phase resistance according to the three-phase total power, the three-phase current average effective value and a preset alternating current resistance formula;
acquiring the temperature of each phase winding acquired by the temperature sensor, and taking the average value of the three-phase winding temperature as the stator temperature;
calculating direct-current phase resistance according to the resistance temperature coefficient of the winding, the stator temperature and the direct-current resistance of the three-phase winding;
in a specific embodiment, after each phase winding receives the measured voltage signal, the power analysis unit 120 collects power information and current information of each phase winding, and calculates an average effective value of three-phase total power and three-phase current for obtaining the subsequent ac phase resistance.
The calculation formula of the alternating-current phase resistance is as follows:
wherein the content of the first and second substances,R(f i) Is an alternating-current phase resistor, and is provided with a resistor,P ithe total power of the three phases is,I iis the average effective value of the three-phase current,f ifor measuring frequency, i is a positive integer.
And calculating the alternating-current phase resistance under the measurement voltage signal corresponding to each group of measurement frequency through the three-phase total power, the three-phase current average effective value and a preset alternating-current resistance formula.
It is noted that during the measurement, the output voltage of the three-phase ac power source 130 needs to be controlled to ensure that the phase current of the motor does not exceed the rated current effective value.
After obtaining the ac phase resistance, the processor 110 obtains temperature data returned by the temperature sensor PT100 disposed in each phase winding, calculates an average value of the three-phase winding temperatures, and uses the average value of the three-phase windings as the stator temperature.
Specifically, when the dc phase resistance is calculated, the dc phase resistance at the corresponding temperature is calculated from the resistance temperature coefficient of the winding, the stator temperature, and the dc resistance between the three-phase winding terminals.
The direct current resistance between the three-phase winding terminals can be respectively tested by using a direct current resistance tester to test the first direct current resistance of the terminals A and B, the second direct current resistance of the terminals B and C and the third direct current resistance of the terminals A and C, after the direct current resistances are obtained, the average value of the first direct current resistance, the second direct current resistance and the third direct current resistance is calculated, and the average value is divided by 2, so that the initial direct current phase resistance can be obtained. And recording temperature data returned by the temperature sensor PT100 corresponding to the three-phase winding at the moment, and taking the average value of the three-phase winding as the reference temperature of the direct-current resistor.
After the initial direct-current phase resistance is obtained, the initial direct-current phase resistance is converted into a resistance value corresponding to the stator temperature according to the resistance temperature coefficient of the winding material, the reference temperature of the direct-current resistance and the stator temperature, and then the direct-current phase resistance used for calculating the alternating-current resistance multiple is obtained.
According to a specific implementation manner of the embodiment of the present disclosure, the calculation formula of the ac resistance multiple is:
wherein the content of the first and second substances,k ac(f i) Is a multiple of the alternating-current resistance,R dciis a direct-current phase resistor, and is provided with a resistor,R(f i) Is an alternating-current phase resistor, and is provided with a resistor,f ifor measuring frequency, i is a positive integer.
Wherein the content of the first and second substances,R dcithe dc phase resistance is converted to the stator temperature at which the ac resistance is measured.
After the ac phase resistance at each measurement frequency and the dc phase resistance corresponding to the stator temperature are obtained, the ac resistance multiple at each measurement frequency can be calculated by the above formula.
S303, fitting according to the AC resistance multiple corresponding to all the measuring frequencies to generate an AC resistance multiple curve;
as shown in fig. 4, after ac multiple resistance at a plurality of measurement frequencies is obtained, a corresponding ac multiple resistance curve can be generated by fitting ac multiple resistance curves corresponding to all measurement frequencies.
And S304, calculating a target alternating current resistance corresponding to a preset target frequency according to the alternating current resistance multiple curve.
After the alternating current resistance multiple curve is obtained, any target frequency can be selected, and a target alternating current resistance corresponding to the target frequency is obtained by interpolating the alternating current resistance multiple curve.
By the alternating current resistance testing method, the alternating current resistance in the high-speed motor can be accurately measured in real time when the high-speed motor is in a high-frequency working state, the iron loss influence in resistance testing can be eliminated, and the accuracy of the alternating current resistance tested when three-phase alternating current is conducted is fully ensured.
Referring to fig. 5, the disclosed embodiment provides an ac resistance testing apparatus 500 for use in the processor 110 of the ac resistance testing system according to the first aspect, where the ac resistance testing apparatus 500 includes:
a starting module 501, configured to send a starting signal to the three-phase ac power supply 130, so that the three-phase ac power supply 130 outputs a set of measurement voltage signals to the stator, where a measurement frequency of the measurement voltage signals increases according to a preset step length;
an obtaining module 502, configured to obtain a resistance correlation value corresponding to a measurement voltage signal at each measurement frequency, and calculate an ac resistance multiple at the corresponding measurement frequency according to the resistance correlation value, where the resistance correlation value includes an ac phase resistance and a dc phase resistance corresponding to a stator temperature;
a generating module 503, configured to generate an ac resistance multiple curve according to ac resistance multiple fitting corresponding to all measurement frequencies;
and a calculating module 504, configured to calculate a target ac resistance corresponding to a preset target frequency according to the ac resistance multiple curve.
For the process of the ac resistance testing apparatus 500 to specifically execute the ac resistance testing method, reference may be made to the above embodiments, which are not described herein again.
In addition, the embodiment of the present disclosure further provides a high-speed motor, which includes a processor 110 and a memory, where the memory stores a computer program, and the computer program executes the ac resistance testing method described in the above embodiment when running on the processor 110.
According to a specific implementation of an embodiment of the present disclosure, a stator of the high-speed electric machine includes a ferrite core and a three-phase winding;
the ferrite magnetic core is made of at least one of manganese zinc ferrite or nickel zinc ferrite.
The disclosed embodiment also provides a computer readable storage medium, in which a computer program is stored, and when the computer program runs on the processor 110, the method for testing the alternating current resistance described in the above embodiment is executed.
To sum up, the embodiments of the present disclosure provide an ac resistance testing system, method, apparatus, and computer-readable storage medium, in which a ferrite core is used to replace a silicon steel sheet core, so that the iron loss of a stator core introduced during ac resistance testing of a motor can be effectively avoided, and the mutual influence of three-phase symmetrical windings when symmetrical current is applied can be reflected, thereby accurately calculating the copper loss of the motor. The specific implementation processes of the high-speed motor and the computer-readable storage medium may refer to the specific implementation processes of the ac resistance testing system and the ac resistance testing method, and are not described in detail herein.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part of the technical solution that contributes to the prior art in essence can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (9)
1. The utility model provides an alternating current resistance test system which characterized in that is applied to the stator among the high-speed electric machine, the stator includes ferrite core and three-phase winding, and a corresponding temperature sensor is all established to each phase winding cover, the system includes: the device comprises a processor, a power analysis unit, a three-phase alternating current power supply and a temperature sensor which is respectively arranged in each phase winding;
the three-phase alternating current power supply is electrically connected with winding terminals of the three-phase winding through the power analysis unit;
the processor is respectively in communication connection with the temperature sensor, the power analysis unit and the three-phase alternating-current power supply;
the processor is configured to:
sending a starting signal to the three-phase alternating-current power supply so that the three-phase alternating-current power supply outputs a plurality of groups of measurement voltage signals to the stator, wherein the measurement frequencies of the plurality of groups of measurement voltage signals are increased progressively according to a preset step length;
acquiring a resistance correlation value corresponding to a measurement voltage signal at each measurement frequency, and calculating an alternating current resistance multiple at the corresponding measurement frequency according to the resistance correlation value, wherein the resistance correlation value comprises an alternating current phase resistance and a direct current phase resistance corresponding to the temperature of a stator;
fitting according to the AC resistance multiple corresponding to all the measurement frequencies to generate an AC resistance multiple curve;
calculating a target alternating current resistance corresponding to a preset target frequency according to the alternating current resistance multiple curve;
the step of obtaining the resistance correlation value corresponding to the measurement voltage signal at each measurement frequency includes:
acquiring the three-phase total power and the three-phase current average effective value acquired by the power analysis unit;
calculating an alternating current phase resistance according to the three-phase total power, the three-phase current average effective value and a preset alternating current resistance formula;
acquiring the temperature of each phase winding acquired by the temperature sensor, and taking the average value of the three-phase winding temperature as the stator temperature;
and calculating the direct-current phase resistance according to the resistance temperature coefficient of the winding, the stator temperature and the direct-current resistance between the three-phase winding terminals.
2. An ac resistance testing method applied to a processor in the ac resistance testing system according to claim 1, the method comprising:
sending a starting signal to the three-phase alternating-current power supply so that the three-phase alternating-current power supply outputs a plurality of groups of measurement voltage signals to the stator, wherein the measurement frequencies of the plurality of groups of measurement voltage signals are increased progressively according to a preset step length;
acquiring a resistance correlation value corresponding to a measurement voltage signal at each measurement frequency, and calculating an alternating current resistance multiple at the corresponding measurement frequency according to the resistance correlation value, wherein the resistance correlation value comprises an alternating current phase resistance and a direct current phase resistance corresponding to the temperature of a stator;
fitting according to the AC resistance multiple corresponding to all the measurement frequencies to generate an AC resistance multiple curve;
calculating a target alternating current resistance corresponding to a preset target frequency according to the alternating current resistance multiple curve;
the step of obtaining the resistance correlation value corresponding to the measurement voltage signal at each measurement frequency includes:
acquiring the three-phase total power and the three-phase current average effective value acquired by the power analysis unit;
calculating an alternating current phase resistance according to the three-phase total power, the three-phase current average effective value and a preset alternating current resistance formula;
acquiring the temperature of each phase winding acquired by the temperature sensor, and taking the average value of the three-phase winding temperature as the stator temperature;
and calculating the direct-current phase resistance according to the resistance temperature coefficient of the winding, the stator temperature and the direct-current resistance between the three-phase winding terminals.
3. The method of claim 2, wherein the measured voltage signal output by the three-phase ac power source is sinusoidal with a harmonic content of no more than 0.5% and the three phases differ from each other by 120 electrical degrees.
4. The method according to claim 2, wherein the ac phase resistance is calculated by the formula:
wherein the content of the first and second substances,R(f i) Is an alternating-current phase resistor, and is provided with a resistor,P ithe total power of the three phases is,I iis the average effective value of the three-phase current,f ifor measuring frequency, i is a positive integer.
5. The method of claim 2, wherein the ac multiple is calculated by the formula:
wherein the content of the first and second substances,k ac(f i) Is a multiple of the alternating-current resistance,R dciis a direct-current phase resistor, and is provided with a resistor,R(f i) Is an alternating-current phase resistor, and is provided with a resistor,f ifor measuring frequency, i is a positive integer.
6. An ac resistance testing apparatus, for use in a processor in the ac resistance testing system of claim 1, the apparatus comprising:
the starting module is used for sending a starting signal to the three-phase alternating-current power supply so that the three-phase alternating-current power supply outputs a group of measuring voltage signals to the stator, wherein the measuring frequency of the measuring voltage signals is increased progressively according to a preset step length;
the acquisition module is used for acquiring a resistance correlation value corresponding to the measurement voltage signal at each measurement frequency and calculating an alternating current resistance multiple at the corresponding measurement frequency according to the resistance correlation value, wherein the resistance correlation value comprises an alternating current phase resistance and a direct current phase resistance corresponding to the temperature of the stator;
the generating module is used for generating an alternating current resistance multiple curve according to alternating current resistance multiple fitting corresponding to all the measuring frequencies;
the calculation module is used for calculating a target alternating current resistance corresponding to a preset target frequency according to the alternating current resistance multiple curve;
the acquisition module is specifically used for acquiring the three-phase total power and the three-phase current average effective value acquired by the power analysis unit; calculating an alternating current phase resistance according to the three-phase total power, the three-phase current average effective value and a preset alternating current resistance formula; acquiring the temperature of each phase winding acquired by the temperature sensor, and taking the average value of the three-phase winding temperature as the stator temperature; and calculating the direct-current phase resistance according to the resistance temperature coefficient of the winding, the stator temperature and the direct-current resistance between the three-phase winding terminals.
7. A high speed electric machine comprising a processor and a memory, the memory storing a computer program which, when run on the processor, performs the AC resistance test method of any one of claims 2 to 5.
8. The high-speed electric machine according to claim 7, wherein the stator of the high-speed electric machine comprises a ferrite core and a three-phase winding;
the ferrite magnetic core is made of at least one of manganese zinc ferrite or nickel zinc ferrite.
9. A computer-readable storage medium, in which a computer program is stored which, when run on a processor, performs the ac resistance test method of any one of claims 2-5.
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