Motor performance parameter determination method and device

Abstract

The invention relates to a motor performance parameter determination method and device. The method comprises the steps of recording current information of a target motor when the target motor is in a first circuit state, outputting a control instruction when the current information meets a preset condition, obtaining rotor current and stator current of the target motor, and performing coordinate transformation on the rotor current and the stator current to obtain a target motor control signal; the method comprises the steps of obtaining a rotor d-axis current and a stator d-axis current, fitting the rotor d-axis current and the stator d-axis current by adopting a preset algorithm to obtain a time domain fitting result of a target motor, and finally determining a performance parameter corresponding to the target motor based on the time domain fitting result; by adopting the method, the accuracy of motor performance parameter identification can be improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a method and device for determining motor performance parameters. Background Art

[0002] Pumped-storage power stations use the gravitational potential energy of water to store electrical energy on a large scale and are important energy storage devices in power systems. Large AC excitation motors are the core equipment for electromechanical energy conversion in variable-speed pumped-storage power stations. Their performance parameters directly determine the operating performance of pumped-storage power stations and the control and protection settings of the power stations.

[0003] At present, large AC excitation motors are often identified by referring to the test methods of traditional wound-rotor asynchronous motors. The process is complicated and has the problem of low accuracy. Summary of the invention

[0004] Based on this, it is necessary to provide a method and device for determining motor performance parameters that can improve the accuracy of motor performance parameter identification in order to address the above technical problems.

[0005] In a first aspect, the present application provides a method for determining motor performance parameters, the method comprising:

[0006] When the target motor is in a first circuit state, the current information of the target motor is recorded; the first circuit state is used to indicate that the positive end of the preset DC power supply is connected to the A-phase winding of the three-phase winding of the stator of the target motor through the first switching device, the negative end of the preset DC power supply is connected to the B-phase winding of the three-phase winding of the stator of the target motor through the second switching device, the rotor of the target motor is in the target position and the three-phase winding of the rotor of the target motor is short-circuited;

[0007] When the current information meets the preset conditions, a control instruction is output, and the rotor current and the stator current of the target motor are obtained; the control instruction is used to instruct the first switching device to be disconnected, and to instruct the second switching device to be disconnected;

[0008] Perform coordinate transformation on the rotor current and the stator current respectively to obtain the rotor d-axis current and the stator d-axis current;

[0009] The rotor d-axis current and the stator d-axis current are fitted respectively by using a preset algorithm to obtain a time domain fitting result of the target motor; the time domain fitting result is used to characterize the calculation relationship between various coefficients, the rotor d-axis current and the stator d-axis current;

[0010] The performance parameters corresponding to the target motor are determined based on the time domain fitting results.

[0011] In one embodiment, the method further comprises:

[0012] When the target motor is in a second circuit state, the voltage information of the target motor is recorded; the second circuit state is used to characterize that the positive end of the preset AC power supply is connected to the A-phase winding of the three-phase winding of the stator of the target motor through the first switching device, the negative end of the preset AC power supply is connected to the B-phase winding of the three-phase winding of the stator of the target motor through the second switching device, the three-phase winding of the rotor of the target motor is open-circuited and the rotor of the target motor is in a rotating state; wherein the voltage information includes a first line voltage and a second line voltage at different times, the first line voltage is used to characterize the open-circuit line voltage of the rotor of the target motor, and the second line voltage is used to characterize the line voltage of the stator of the target motor;

[0013] The first amplitudes of the first line voltages at adjacent moments are compared, and the target position is determined according to the comparison result, the phase of the first line voltage, and the phase of the second line voltage.

[0014] In one embodiment, comparing the first amplitudes of the first line voltages at adjacent moments, and determining the target position according to the comparison result, the phase of the first line voltage, and the phase of the second line voltage, includes:

[0015] Select the time corresponding to the maximum amplitude among the first amplitudes as the target time;

[0016] If the phase of the first line voltage corresponding to the target time is equal to the phase of the second line voltage corresponding to the target time, the position corresponding to the rotor of the target motor at the target time is determined as the target position.

[0017] In one embodiment, the current information includes the current of the A-phase winding at different times; when the current information meets the preset conditions, the control instruction is output, including:

[0018] Obtaining a second amplitude between the currents of the A-phase winding at each adjacent moment;

[0019] When the second amplitude is smaller than the preset value, a control instruction is output.

[0020] In one embodiment, determining the performance parameters corresponding to the target motor based on the time domain fitting result includes:

[0021] The time domain fitting result is converted into a frequency domain conversion result corresponding to the time domain fitting result; the frequency domain conversion result is used to characterize the calculation relationship between each coefficient and each performance parameter;

[0022] The performance parameters are determined based on the frequency domain conversion results and the time domain fitting results.

[0023] In one of the embodiments, when the target motor is in the first circuit state, the three-phase windings of the rotor of the target motor are short-circuited in a Y-type manner.

[0024] In a second aspect, the present application further provides a device for determining motor performance parameters, the device comprising:

[0025] A recording module is used to record the current information of the target motor when the target motor is in a first circuit state; the first circuit state is used to indicate that the positive end of the preset DC power supply is connected to the A-phase winding of the three-phase winding of the stator of the target motor through the first switching device, the negative end of the preset DC power supply is connected to the B-phase winding of the three-phase winding of the stator of the target motor through the second switching device, the rotor of the target motor is in the target position and the three-phase winding of the rotor of the target motor is short-circuited;

[0026] An acquisition module, used to output a control instruction and acquire the rotor current and the stator current of the target motor when the current information meets a preset condition; the control instruction is used to instruct the first switch device to disconnect and the second switch device to disconnect;

[0027] A conversion module, used for performing coordinate transformation on the rotor current and the stator current respectively to obtain the rotor d-axis current and the stator d-axis current;

[0028] A fitting module is used to fit the rotor d-axis current and the stator d-axis current respectively using a preset algorithm to obtain a time domain fitting result of the target motor; the time domain fitting result is used to characterize the calculation relationship between various coefficients, the rotor d-axis current and the stator d-axis current;

[0029] The determination module is used to determine the performance parameters corresponding to the target motor based on the time domain fitting results.

[0030] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0031] In a fourth aspect, the present application also provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the above method when the computer program is executed by a processor.

[0032] In a fifth aspect, the present application also provides a computer program product, including a computer program, which implements the steps of the above method when executed by a processor.

[0033] The above-mentioned method and device for determining motor performance parameters record the current information of the target motor when the target motor is in the first circuit state, and then output a control instruction when the current information meets the preset conditions, and obtain the rotor current and stator current of the target motor, respectively perform coordinate transformation on the rotor current and the stator current to obtain the rotor d-axis current and the stator d-axis current, and use a preset algorithm to fit the rotor d-axis current and the stator d-axis current to obtain the time domain fitting result of the target motor, and finally determine the corresponding performance parameters of the target motor based on the time domain fitting result; the present application records the current information of the target motor when it is in the first circuit state, and determines the corresponding performance parameters of the target motor according to the acquired rotor current and stator current when the current information meets the preset conditions, thereby avoiding the complexity of parameter identification with reference to the test method of traditional winding asynchronous motors and improving the accuracy of motor performance parameter identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0035] FIG1 is a schematic diagram of a flow chart of a method for determining motor performance parameters in one embodiment;

[0036] FIG2 is a schematic diagram of a first circuit state in an embodiment;

[0037] FIG3 is a schematic diagram of the principle of a second circuit state in one embodiment;

[0038] FIG4 is a structural block diagram of a device for determining motor performance parameters in one embodiment;

[0039] FIG. 5 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0040] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0042] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first line voltage may be referred to as a second line voltage, and similarly, a second line voltage may be referred to as a first line voltage. Both the first line voltage and the second line voltage are line voltages, but they are not the same line voltage.

[0043] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0044] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0045] With the large-scale access of new energy sources to the power grid, the source-load imbalance problem in the power system is becoming increasingly serious, and a large number of energy storage devices need to be built to balance power fluctuations. Pumped-storage power stations use the gravitational potential energy of water to store electrical energy on a large scale, and are important energy storage devices in the power system. Since variable-speed pumped-storage power stations have excellent dynamic performance and a wider operating range, they can quickly respond to the peak and frequency regulation needs of the power grid, and are gradually replacing traditional fixed-speed pumped-storage power stations. Among them, large AC excitation motors are the core equipment for electromechanical energy conversion in variable-speed pumped-storage power stations. Accurately measuring the performance parameters of AC excitation motors plays an important role in the performance evaluation and protection setting of AC excitation motors.

[0046] However, large AC excitation motors are often identified by referring to the test methods of traditional wound-rotor asynchronous motors. These test methods have high requirements on equipment conditions, are complex and dangerous, are difficult to use in engineering, and have the problem of low accuracy.

[0047] The motor performance parameter determination method provided in the embodiment of the present application can be applied to a computer device. Wherein, when the target motor is in the first circuit state, the computer device records the current information of the target motor through an oscilloscope or other device capable of obtaining the current of the target motor. When the current information meets the preset conditions, the computer device outputs a control instruction and obtains the rotor current and stator current of the target motor. The performance parameters corresponding to the target motor are determined according to the obtained rotor current and stator current, avoiding the complexity of parameter identification by referring to the test method of the traditional wound asynchronous motor. The test wiring is simple and has low requirements on equipment conditions. The test process is highly safe and more suitable for engineering practice. At the same time, the accuracy of motor performance parameter identification is improved.

[0048] In an exemplary embodiment, as shown in FIG1 , a method for determining motor performance parameters is provided, and the method is described by taking the application of the method to a computer device as an example. The method includes:

[0049] S102, when the target motor is in a first circuit state, record the current information of the target motor; the first circuit state is used to characterize that the positive end of the preset DC power supply is connected to the A-phase winding in the three-phase winding of the stator of the target motor through the first switching device, the negative end of the preset DC power supply is connected to the B-phase winding in the three-phase winding of the stator of the target motor through the second switching device, and the rotor of the target motor is in the target position and the three-phase winding of the rotor of the target motor is short-circuited.

[0050] Among them, the output signal size of the preset DC power supply can be set according to actual conditions, and is not limited in the embodiment of the present application; the model of the target motor can be set according to actual conditions, and the AC excitation motor is used as an example for explanation in the embodiment of the present application.

[0051] Specifically, the first circuit state refers to the circuit state required for the DC decay test, and the target motor is an AC excitation motor with the rotor at the target position. Generally, the motor is a large AC excitation motor. The current information includes the A-phase winding current of the stator and the U-phase winding current of the rotor; the computer device can record the current information of the target motor through a recorder or other current sensors.

[0052] Exemplarily, FIG2 shows the wiring method required for the DC attenuation test. As shown in FIG2 , the preset DC power supply is a DC voltage source, the first switching device and the second switching device are switches, and the computer device records the A-phase current (A-phase winding current) and U-phase current (U-phase winding current) of the target motor through a current sensor or a recorder.

[0053] S104, when the current information meets the preset conditions, output a control instruction and obtain the rotor current and the stator current of the target motor; the control instruction is used to instruct the first switching device to disconnect, and instruct the second switching device to disconnect.

[0054] Among them, the preset conditions can be set according to actual conditions and will not be described in detail in the embodiments of the present application.

[0055] Specifically, when the acquired current information meets the preset conditions, the computer device outputs a control instruction to instruct the first switching device to disconnect and instructs the second switching device to disconnect. When both the first switching device and the second switching device are disconnected, a recorder is used to record the rotor current and the stator current. It should be noted that the rotor current is the U-phase winding current of the rotor, and the stator current is the A-phase winding current of the stator.

[0056] S106, performing coordinate transformation on the rotor current and the stator current respectively to obtain the rotor d-axis current and the stator d-axis current.

[0057] Among them, the coordinate transformation is also called dq coordinate transformation.

[0058] Specifically, the computer device changes the coordinates of the stator A-phase winding current and the rotor U-phase winding current obtained from the DC decay test record to satisfy the following equations (1) and (2):

[0059] (1);

[0060] (2);

[0061] Among them, i ds is the stator d-axis current; i dr is the rotor d-axis current; i a The stator current obtained for the DC decay test record; i u The rotor current obtained for the DC decay test record; i a0 The initial steady-state current of stator phase A is obtained by recording the DC attenuation test. It should be noted that the initial steady-state current of stator phase A can be directly measured by a recorder, that is, the stable part of the waveform on the recorder is the initial steady-state current of stator phase A. It can also be calculated based on the relationship between voltage and resistance, which will not be elaborated in the embodiments of the present application.

[0062] S108, using a preset algorithm to fit the rotor d-axis current and the stator d-axis current respectively to obtain a time domain fitting result of the target motor; the time domain fitting result is used to characterize the calculation relationship between various coefficients, the rotor d-axis current and the stator d-axis current.

[0063] Among them, the preset algorithm can be set according to actual conditions and is not limited in the embodiments of the present application.

[0064] Specifically, since the d-axis and q-axis magnetic circuits of large AC excitation motors are symmetrical, the d-axis and q-axis equivalent circuits are the same, so the d-axis current i d and q-axis current i q The time domain analytical expressions are the same, only the difference in signs exists, which does not affect the parameter identification results. You can choose any one of them to fit the expression, and the time domain fitting result can be the time domain expression. Taking the d-axis current as an example, when the DC attenuation test is performed, the stator d-axis current i ds The time domain expression of ds (t) and rotor d-axis current i dr The time domain expression of dr (t) are shown in the following formulas (3) and (4) respectively:

[0065] (3);

[0066] (4);

[0067] Among them, C1, C2, D1, D2 are amplitude coefficients, λ1, λ2 are attenuation coefficients, i dw is the steady-state value of the d-axis current; it should be noted that each coefficient includes the amplitude coefficient and the attenuation coefficient; by combining the stator d-axis current i ds , time domain expression i ds (t), rotor d-axis current i dr and the time domain expression i dr (t) The nonlinear fitting capability of the artificial intelligence algorithm can be used to obtain the specific values ​​of each coefficient and the steady-state value of the d-axis current.

[0068] S110, determining performance parameters corresponding to the target motor based on the time domain fitting result.

[0069] Specifically, the time domain fitting results after fitting are used to solve the performance parameters corresponding to the target motor, and the performance parameters are used to characterize the working performance of the target motor.

[0070] In the above-mentioned method for determining motor performance parameters, when the target motor is in the first circuit state, the current information of the target motor is recorded, and then when the current information meets the preset conditions, the control instruction is output, and the rotor current and the stator current of the target motor are obtained, and the coordinate transformation of the rotor current and the stator current is performed respectively to obtain the rotor d-axis current and the stator d-axis current, and the preset algorithm is used to fit the rotor d-axis current and the stator d-axis current respectively to obtain the time domain fitting result of the target motor, and finally the performance parameters corresponding to the target motor are determined based on the time domain fitting result; the complexity of parameter identification by referring to the test method of traditional winding asynchronous motor is avoided, the test wiring is simple and the equipment conditions are low, the test process is highly safe, and it is more suitable for engineering practice, while improving the accuracy of motor performance parameter identification.

[0071] In one of the embodiments, when the target motor is in the first circuit state, the three-phase windings of the rotor of the target motor are short-circuited in a Y-type manner.

[0072] Specifically, as shown in FIG. 2 , when the target motor is in the first circuit state, the three-phase windings of the rotor are short-circuited in a Y-type manner.

[0073] In one embodiment, the method further comprises:

[0074] When the target motor is in a second circuit state, the voltage information of the target motor is recorded; the second circuit state is used to characterize that the positive end of the preset AC power supply is connected to the A-phase winding of the three-phase winding of the stator of the target motor through the first switching device, the negative end of the preset AC power supply is connected to the B-phase winding of the three-phase winding of the stator of the target motor through the second switching device, the three-phase winding of the rotor of the target motor is open-circuited and the rotor of the target motor is in a rotating state; wherein the voltage information includes a first line voltage and a second line voltage at different times, the first line voltage is used to characterize the open-circuit line voltage of the rotor of the target motor, and the second line voltage is used to characterize the line voltage of the stator of the target motor;

[0075] The first amplitudes of the first line voltages at adjacent moments are compared, and the target position is determined according to the comparison result, the phase of the first line voltage, and the phase of the second line voltage.

[0076] Among them, the output signal size of the preset AC power supply can be set according to actual conditions and is not limited in the embodiment of the present application.

[0077] Specifically, the second circuit state refers to the circuit state required for performing a rotor pre-positioning test. The voltage information includes the open-circuit line voltage (first line voltage) between the U and V phase windings of the rotor and the line voltage (second line voltage) between the A and B phase windings of the stator at different times. When the target motor is in the second circuit state, the computer device records the voltage information of the target motor through a recorder, and obtains the first amplitude between the first line voltages at each adjacent time, compares the first amplitudes, and determines the target position based on the comparison result, the phase of the first line voltage, and the phase of the second line voltage.

[0078] For example, FIG3 shows the wiring method required for the rotor pre-positioning test. As shown in FIG3, the preset AC power supply is an AC voltage source, the first switching device and the second switching device are switches, and the computer device records the first line voltage (V uv ) and the second line voltage.

[0079] In an embodiment of the present application, by recording the voltage information of the target motor when the target motor is in the second circuit state, and comparing the first amplitudes between the first line voltages at each adjacent moment based on the voltage information, the target position is determined according to the comparison result, the phase of the first line voltage, and the phase of the second line voltage, and the pre-positioning of the rotor is completed, which facilitates the acquisition of subsequent performance parameters. The performance parameters of the target motor can be measured through only two test processes. The test wiring is simple and has low requirements on equipment conditions. The test process is highly safe and is more suitable for engineering practice. At the same time, it improves the accuracy of motor performance parameter identification.

[0080] In one embodiment, comparing the first amplitudes of the first line voltages at adjacent moments, and determining the target position according to the comparison result, the phase of the first line voltage, and the phase of the second line voltage, includes:

[0081] Select the time corresponding to the maximum amplitude among the first amplitudes as the target time;

[0082] If the phase of the first line voltage corresponding to the target time is equal to the phase of the second line voltage corresponding to the target time, the position corresponding to the rotor of the target motor at the target time is determined as the target position.

[0083] Specifically, by comparing the sizes of each first amplitude, the moment corresponding to the largest first amplitude is selected as the target moment. If the phase of the first line voltage corresponding to the target moment is equal to the phase of the second line voltage corresponding to the target moment, that is, the open-line voltage amplitude of the rotor is the largest and is in phase with the stator line voltage, the position corresponding to the rotor of the target motor at the target moment is determined as the target position, and the rotor pre-positioning test is completed.

[0084] In an embodiment of the present application, by selecting the moment corresponding to the maximum amplitude among the first amplitudes as the target moment, and when the phase of the first line voltage corresponding to the target moment is equal to the phase of the second line voltage corresponding to the target moment, the position corresponding to the rotor of the target motor at the target moment is determined as the target position, and the pre-positioning of the rotor is completed, which facilitates the acquisition of subsequent performance parameters.

[0085] In one embodiment, the current information includes the current of the A-phase winding at different times; when the current information meets the preset conditions, the control instruction is output, including:

[0086] Obtaining a second amplitude between the currents of the A-phase winding at each adjacent moment;

[0087] When the second amplitude is smaller than the preset value, a control instruction is output.

[0088] Among them, the size of the preset value can be set according to actual conditions and is not limited in the embodiments of the present application.

[0089] Specifically, by obtaining the second amplitude between the A-phase winding current at each adjacent moment, based on the comparison result between the second amplitude and the preset value, when the second amplitude is less than the preset value, that is, when the A-phase winding current tends to be stable, a control instruction is output to stop applying DC voltage to the stator winding, and at the same time, the rotor current and stator current of the target motor are recorded with a recorder.

[0090] Exemplarily, the computer device may be configured with a human-computer interaction interface, and through a user's triggering operation on the human-computer interaction page, the computer device may output a control instruction to instruct the first switch card device and the second switch device to disconnect.

[0091] In one embodiment, determining the performance parameters corresponding to the target motor based on the time domain fitting result includes:

[0092] The time domain fitting result is converted into a frequency domain conversion result corresponding to the time domain fitting result; the frequency domain conversion result is used to characterize the calculation relationship between each coefficient and each performance parameter;

[0093] The performance parameters are determined based on the frequency domain conversion results and the time domain fitting results.

[0094] Specifically, the frequency domain conversion result includes a frequency domain expression, which converts the stator d-axis current i ds The time domain expression of ds (t) and rotor d-axis current i dr The time domain expression of dr (t) is Laplace transformed to obtain the frequency domain expression as shown in (5) and (6):

[0095] (5);

[0096] (6);

[0097] The performance parameters of the motor are solved to obtain the following equation (7):

[0098] (7);

[0099] Among them, the performance parameters include stator self-inductance parameter Ls, stator transient self-inductance parameter Ls', rotor time constant parameter Tr, rotor transient time constant parameter Tr', stator leakage inductance Ls1 and rotor leakage inductance Lr1; rs is the armature circuit resistance; rr represents the rotor winding resistance; idw is the steady-state value of the d-axis current.

[0100] It should be noted that the coefficients α0, α1, β0, γ1 and γ2 in the frequency domain expressions (5) and (6) can be obtained by performing Laplace transform on the amplitude coefficients and attenuation coefficients in the time domain expressions (3) and (4), which will not be described in detail in the embodiments of the present application.

[0101] In the embodiment of the present application, the time domain fitting result after fitting is first converted into the frequency domain to obtain the electrical frequency domain conversion result, and then the frequency domain conversion result is solved to obtain the performance parameters, thereby achieving accurate calculation of the performance parameters.

[0102] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0103] Based on the same inventive concept, the embodiment of the present application also provides a motor performance parameter determination device for implementing the motor performance parameter determination method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more motor performance parameter determination device embodiments provided below can refer to the limitations of the motor performance parameter determination method above, and will not be repeated here.

[0104] In an exemplary embodiment, as shown in FIG4 , a motor performance parameter determination device 400 is provided, and the device 400 includes:

[0105] The recording module 401 is used to record the current information of the target motor when the target motor is in a first circuit state; the first circuit state is used to indicate that the positive end of the preset DC power supply is connected to the A-phase winding of the three-phase winding of the stator of the target motor through the first switching device, the negative end of the preset DC power supply is connected to the B-phase winding of the three-phase winding of the stator of the target motor through the second switching device, the rotor of the target motor is in the target position and the three-phase winding of the rotor of the target motor is short-circuited;

[0106] The acquisition module 402 is used to output a control instruction and acquire the rotor current and the stator current of the target motor when the current information meets the preset conditions; the control instruction is used to instruct the first switch device to disconnect and the second switch device to disconnect;

[0107] The conversion module 403 is used to perform coordinate transformation on the rotor current and the stator current respectively to obtain the rotor d-axis current and the stator d-axis current;

[0108] A fitting module 404 is used to fit the rotor d-axis current and the stator d-axis current respectively using a preset algorithm to obtain a time domain fitting result of the target motor; the time domain fitting result is used to characterize the calculation relationship between various coefficients, the rotor d-axis current and the stator d-axis current;

[0109] The determination module 405 is used to determine the performance parameters corresponding to the target motor based on the time domain fitting result.

[0110] In one embodiment, the device 400 further includes a pre-positioning module for recording voltage information of the target motor when the target motor is in a second circuit state; the second circuit state is used to characterize that the positive end of the preset AC power supply is connected to the A-phase winding of the three-phase winding of the stator of the target motor through the first switching device, the negative end of the preset AC power supply is connected to the B-phase winding of the three-phase winding of the stator of the target motor through the second switching device, the three-phase winding of the rotor of the target motor is open-circuited and the rotor of the target motor is in a rotating state; wherein the voltage information includes a first line voltage and a second line voltage at different times, the first line voltage is used to characterize the open-circuit line voltage of the rotor of the target motor, and the second line voltage is used to characterize the line voltage of the stator of the target motor;

[0111] The first amplitudes of the first line voltages at adjacent moments are compared, and the target position is determined according to the comparison result, the phase of the first line voltage, and the phase of the second line voltage.

[0112] In one embodiment, the pre-positioning module is further used to select the time corresponding to the maximum amplitude among the first amplitudes as the target time;

[0113] If the phase of the first line voltage corresponding to the target time is equal to the phase of the second line voltage corresponding to the target time, the position corresponding to the rotor of the target motor at the target time is determined as the target position.

[0114] In one embodiment, the current information includes the current of the phase A winding at different times; the acquisition module 402 is further used to acquire the second amplitude between the currents of the phase A winding at each adjacent time;

[0115] When the second amplitude is smaller than the preset value, a control instruction is output.

[0116] In one embodiment, the determination module 405 is further used to convert the time domain fitting result into a frequency domain conversion result corresponding to the time domain fitting result; the frequency domain conversion result is used to characterize the calculation relationship between each coefficient and each performance parameter;

[0117] The performance parameters are determined based on the frequency domain conversion results and the time domain fitting results.

[0118] In one of the embodiments, when the target motor is in the first circuit state, the three-phase windings of the rotor of the target motor are short-circuited in a Y-type manner.

[0119] Each module in the above-mentioned motor performance parameter determination device can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0120] In an exemplary embodiment, a computer device is provided, which may be a server or a terminal. In the embodiment of the present application, the computer device is taken as a terminal for example, and its internal structure diagram may be shown in FIG5. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, the memory, and the input / output interface are connected via a system bus, and the communication interface, the display unit, and the input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner may be implemented through WIFI, a mobile cellular network, a near field communication (NFC) or other technologies. When the computer program is executed by the processor, a method for determining motor performance parameters is implemented. The display unit of the computer device is used to form a visually visible picture, and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a key, trackball, or touchpad provided on the computer device housing, or an external keyboard, touchpad, or mouse, etc.

[0121] Those skilled in the art will understand that the structure shown in FIG. 5 is merely a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0122] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the above-mentioned method for determining motor performance parameters when executing the computer program.

[0123] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned method for determining motor performance parameters is implemented.

[0124] In one embodiment, a computer program product is provided, comprising a computer program, which implements the above-mentioned method for determining motor performance parameters when executed by a processor.

[0125] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0126] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0127] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0128] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for determining motor performance parameters, characterized in that: The method comprises: When the target motor is in a first circuit state, current information of the target motor is recorded; the first circuit state is used to indicate that the positive end of a preset DC power supply is connected to a phase A winding in a three-phase winding of a stator of the target motor through a first switching device, the negative end of the preset DC power supply is connected to a phase B winding in a three-phase winding of a stator of the target motor through a second switching device, the rotor of the target motor is in a target position and the three-phase winding of the rotor of the target motor is short-circuited; When the current information satisfies a preset condition, a control instruction is output, and a rotor current and a stator current of the target motor are acquired; the control instruction is used to instruct the first switching device to be disconnected, and to instruct the second switching device to be disconnected; Performing coordinate transformation on the rotor current and the stator current respectively to obtain a rotor d-axis current and a stator d-axis current; The rotor d-axis current and the stator d-axis current are fitted respectively by using a preset algorithm to obtain a time domain fitting result of the target motor; the time domain fitting result is used to characterize the calculation relationship between various coefficients, the rotor d-axis current and the stator d-axis current; The performance parameters corresponding to the target motor are determined based on the time domain fitting result.

2. The method according to claim 1, characterized in that The method further comprises: When the target motor is in a second circuit state, the voltage information of the target motor is recorded; the second circuit state is used to represent that the positive end of the preset AC power supply is connected to the A-phase winding of the three-phase winding of the stator of the target motor through the first switching device, the negative end of the preset AC power supply is connected to the B-phase winding of the three-phase winding of the stator of the target motor through the second switching device, the three-phase winding of the rotor of the target motor is open-circuited and the rotor of the target motor is in a rotating state; wherein the voltage information includes a first line voltage and a second line voltage at different times, the first line voltage is used to represent the open-circuit line voltage of the rotor of the target motor, and the second line voltage is used to represent the line voltage of the stator of the target motor; The first amplitudes of the first line voltages at adjacent moments are compared, and the target position is determined according to the comparison result, the phase of the first line voltage, and the phase of the second line voltage.

3. The method according to claim 2, characterized in that The comparing the first amplitudes of the first line voltages at adjacent moments, and determining the target position according to the comparison result, the phase of the first line voltage, and the phase of the second line voltage, comprises: Selecting the time corresponding to the maximum value among the first amplitudes as the target time; If the phase of the first line voltage corresponding to the target time is equal to the phase of the second line voltage corresponding to the target time, the position corresponding to the rotor of the target motor at the target time is determined as the target position.

4. The method according to claim 1, characterized in that The current information includes the current of the A-phase winding at different times; when the current information satisfies a preset condition, outputting a control instruction includes: Obtaining a second amplitude between the A-phase winding currents at each adjacent moment; When the second amplitude is smaller than a preset value, the control instruction is output.

5. The method according to claim 1, characterized in that The determining of the performance parameters corresponding to the target motor based on the time domain fitting result includes: Converting the time domain fitting result into a frequency domain conversion result corresponding to the time domain fitting result; the frequency domain conversion result is used to characterize the calculation relationship between each coefficient and each performance parameter; The performance parameter is determined based on the frequency domain conversion result and the time domain fitting result.

6. The method according to claim 1, characterized in that When the target motor is in the first circuit state, the three-phase windings of the rotor of the target motor are short-circuited in a Y-type manner.

7. A device for determining motor performance parameters, characterized in that: The device comprises: A recording module, used for recording the current information of the target motor when the target motor is in a first circuit state; the first circuit state is used to indicate that the positive end of a preset DC power supply is connected to the A-phase winding of the three-phase winding of the stator of the target motor through a first switching device, the negative end of the preset DC power supply is connected to the B-phase winding of the three-phase winding of the stator of the target motor through a second switching device, the rotor of the target motor is in a target position and the three-phase winding of the rotor of the target motor is short-circuited; an acquisition module, configured to output a control instruction and acquire a rotor current and a stator current of the target motor when the current information satisfies a preset condition; the control instruction is used to instruct the first switching device to disconnect, and to instruct the second switching device to disconnect; A conversion module, used to perform coordinate transformation on the rotor current and the stator current respectively to obtain a rotor d-axis current and a stator d-axis current; A fitting module, used to fit the rotor d-axis current and the stator d-axis current respectively using a preset algorithm to obtain a time domain fitting result of the target motor; the time domain fitting result is used to characterize the calculation relationship between various coefficients, the rotor d-axis current and the stator d-axis current; A determination module is used to determine the performance parameters corresponding to the target motor based on the time domain fitting result.

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

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

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

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