A calibration test method and device for a permanent magnet synchronous motor and a computer device

Abstract

Embodiments of the present application provide a calibration test method of a permanent magnet synchronous motor, the method comprising: obtaining a test table, the test table comprising at least one calibration test point, wherein each calibration test point corresponds to a calibration speed and a calibration current of the permanent magnet synchronous motor; for each target calibration test point in the test table, testing motor torque of the permanent magnet synchronous motor under different motor q-axis inductances based on the calibration speed and the calibration current corresponding to the target calibration test point; and outputting a maximum motor torque corresponding to the target calibration test point and a target motor q-axis inductance corresponding to the maximum motor torque. The technical solution provided by the present application can accurately and quickly calibrate and test the torque of the permanent magnet synchronous motor to a certain extent, can minimize human intervention, and ultimately improve the calibration test efficiency.

Description

Technical Field

[0001] This invention belongs to the field of new energy vehicle motor testing technology, specifically relating to a calibration and testing method, device, and computer equipment for a permanent magnet synchronous motor. Background Technology

[0002] Permanent magnet synchronous motors (PMSMs) have unique structures and characteristics. When testing them on test benches and systems, precise calibration at specified operating points across their entire speed and torque range is necessary to determine their optimal performance throughout the entire operating range. Currently, testing PMSMs on test benches and systems typically relies on testers manually inputting different parameters repeatedly to find the optimal parameters for each specified operating point. This method is labor-intensive, time-consuming, and the test results are significantly affected by human factors.

[0003] Therefore, those skilled in the art urgently need a calibration and testing method for permanent magnet synchronous motors (PMSMs) that can accurately and quickly calibrate and test the torque of PMSMs, while minimizing human intervention and ultimately improving calibration and testing efficiency. Summary of the Invention

[0004] The embodiments of this application provide a calibration and testing method, apparatus, and computer equipment for a permanent magnet synchronous motor, which can at least to a certain extent accurately and quickly calibrate and test the torque of the permanent magnet synchronous motor, and can also minimize human intervention and ultimately improve calibration and testing efficiency.

[0005] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0006] According to one aspect of this application, a calibration test method for a permanent magnet synchronous motor is provided. The method includes: acquiring a test table, the test table including at least one calibration test point, wherein each calibration test point corresponds to a calibration speed and a calibration current of the permanent magnet synchronous motor; for each target calibration test point in the test table, based on the calibration speed and calibration current corresponding to the target calibration test point, testing the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances; and outputting the maximum motor torque corresponding to the target calibration test point, and the target motor q-axis inductance corresponding to the maximum motor torque.

[0007] In some embodiments of this application, obtaining the test table includes: obtaining the speed range and current range of the permanent magnet synchronous motor; selecting at least one rated speed in the speed range and at least one rated current in the current range; and constructing the test table based on the at least one rated speed and the at least one rated current.

[0008] In some embodiments of this application, the step of testing the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances, based on the calibration speed and calibration current corresponding to each target calibration test point in the test table, includes: determining the test order of each calibration test point in the test table, wherein a predetermined number of adjacent calibration test points have the same calibration speed or the same calibration current; determining the target calibration test points in the test table sequentially according to the test order of each calibration test point in the test table, and testing the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances based on the calibration speed and calibration current corresponding to the target calibration test points.

[0009] In some embodiments of this application, the step of testing the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances based on the calibration speed and calibration current corresponding to the target calibration test point includes: obtaining the rated d-axis inductance of the permanent magnet synchronous motor; and testing the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances based on the calibration speed and calibration current corresponding to the target calibration test point, and the rated d-axis inductance.

[0010] In some embodiments of this application, obtaining the rated d-axis inductance of the permanent magnet synchronous motor includes: obtaining the short-circuit current of the permanent magnet synchronous motor, the back electromotive force of the permanent magnet synchronous motor at the rated speed, and the rated frequency of the permanent magnet synchronous motor; and calculating the rated d-axis inductance of the permanent magnet synchronous motor based on the short-circuit current, the back electromotive force, and the rated frequency.

[0011] In some embodiments of this application, the step of testing the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances based on the calibration speed and calibration current corresponding to the target calibration test point includes: obtaining the target motor q-axis inductance corresponding to a historical calibration test point adjacent to the target calibration test point, as the initial motor q-axis inductance; determining at least one target motor q-axis inductance based on the initial motor q-axis inductance and at intervals of preset inductance differences; and testing the motor torque of the permanent magnet synchronous motor under each target motor q-axis inductance.

[0012] In some embodiments of this application, before performing a calibration test, the winding temperature of the permanent magnet synchronous motor is obtained. If the winding temperature is greater than or equal to a predetermined temperature, the permanent magnet synchronous motor is cooled until the winding temperature is lower than the predetermined temperature before performing the current calibration test.

[0013] According to one aspect of this application, a calibration testing apparatus for a permanent magnet synchronous motor is provided. The apparatus includes: an acquisition unit configured to acquire a test table, the test table including at least one calibration test point, wherein each calibration test point corresponds to a calibration speed and a calibration current of the permanent magnet synchronous motor; a testing unit configured to test the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances for each target calibration test point in the test table, based on the calibration speed and calibration current corresponding to the target calibration test point; and an output unit configured to output the maximum motor torque corresponding to the target calibration test point, and the target motor q-axis inductance corresponding to the maximum motor torque.

[0014] According to one aspect of this application, a computer-readable storage medium is provided, characterized in that the computer-readable storage medium stores at least one piece of program code, the at least one piece of program code being loaded and executed by a processor to perform the operations performed as described in the calibration test method for a permanent magnet synchronous motor.

[0015] According to one aspect of this application, the computer device includes one or more processors and one or more memories, the one or more memories storing at least one piece of program code, the at least one piece of program code being loaded and executed by the one or more processors to perform operations as described in the calibration test method for permanent magnet synchronous motors.

[0016] Based on the above solution, this application has at least the following advantages or improvements:

[0017] This application provides a calibration and testing method for a permanent magnet synchronous motor. By acquiring a test table and calibrating the target calibration test points on the test table according to the calibrated speed and calibrated current, the method can achieve automatic and rapid calibration testing of the permanent magnet synchronous motor without the need for manual parameter adjustment. Furthermore, for each target calibration test point, multiple motor torques are obtained by changing the q-axis inductance. Finally, the maximum motor torque corresponding to the target calibration test point and the target motor q-axis inductance corresponding to the maximum motor torque are output, thus achieving accurate calibration of the permanent magnet synchronous motor.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0020] Figure 1 A simplified flowchart of a calibration test method for a permanent magnet synchronous motor according to one embodiment of this application is shown;

[0021] Figure 2 A simplified flowchart of a calibration test method for a permanent magnet synchronous motor according to one embodiment of this application is shown;

[0022] Figure 3 A simplified flowchart of a calibration test method for a permanent magnet synchronous motor according to one embodiment of this application is shown;

[0023] Figure 4 A simplified flowchart of a calibration test method for a permanent magnet synchronous motor according to one embodiment of this application is shown;

[0024] Figure 5 A simplified flowchart of a calibration test method for a permanent magnet synchronous motor according to one embodiment of this application is shown;

[0025] Figure 6 A simplified system architecture diagram of the permanent magnet synchronous motor calibration test according to one embodiment of this application is shown;

[0026] Figure 7 A simplified structural diagram of a calibration and testing device for a permanent magnet synchronous motor according to one embodiment of this application is shown;

[0027] Figure 8 A schematic diagram of a computer system architecture suitable for implementing embodiments of this application is shown. Detailed Implementation

[0028] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0029] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0030] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0031] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0033] See Figure 1 , Figure 1 A simplified flowchart of a calibration test method for a permanent magnet synchronous motor according to one embodiment of this application is shown. The method may include steps S101-S103:

[0034] Step S101: Obtain a test table, which includes at least one calibration test point, wherein each calibration test point corresponds to the calibration speed and calibration current of the permanent magnet synchronous motor.

[0035] Step S102: For each target calibration test point in the test table, based on the calibration speed and calibration current corresponding to the target calibration test point, test the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances.

[0036] Step S103: Output the maximum motor torque corresponding to the target calibration test point, and the target motor q-axis inductance corresponding to the maximum motor torque.

[0037] In this application, a calibration current and a calibration speed are set in the test table. The motor torque of the permanent magnet synchronous motor under different q-axis inductances can be tested according to the calibration current and calibration speed in the test table. The operating parameter range of the permanent magnet synchronous motor can be accurately calibrated and tested, providing sufficient data support for subsequent tests. The performance of the permanent magnet synchronous motor can also be evaluated based on the calibration results.

[0038] See Figure 2 , Figure 2 A simplified flowchart of a calibration test method for a permanent magnet synchronous motor according to one embodiment of this application is shown. The method for obtaining the test table may include steps S201-S203:

[0039] Step S201: Obtain the speed range and current range of the permanent magnet synchronous motor.

[0040] Step S202: Select at least one rated speed in the speed range and at least one rated current in the current range.

[0041] Step S203: Construct the test table based on the at least one calibrated rotational speed and the at least one calibrated current.

[0042] In this application, the test table records the calibration current and calibration speed for each target calibration test point. Multiple calibration speeds can be divided into fixed intervals within the speed range, and similarly, multiple calibration currents can be divided into fixed intervals within the current range. The calibration speeds and calibration currents can be combined one by one to construct the test table. For example, multiple calibration speeds can be divided into fixed intervals within the speed range: a, b, c, d, e; and multiple calibration currents can be divided into fixed intervals within the current range: A, B, C, D, E. Therefore, 25 calibration test points can be obtained, and the test table is shown in Table 1.

[0043]

[0044] Table 1

[0045] In this embodiment, the method for testing the motor torque of the permanent magnet synchronous motor under different q-axis inductances, based on the calibration speed and calibration current corresponding to the target calibration test point, may include: determining the test order of each calibration test point in the test table, wherein adjacent calibration test points with a predetermined logarithm have the same calibration speed or the same calibration current. Following the test order of each calibration test point in the test table, the target calibration test points are sequentially determined in the test table, and the motor torque of the permanent magnet synchronous motor under different q-axis inductances is tested based on the calibration speed and calibration current corresponding to the target calibration test point.

[0046] In this application, the test table can set the test order of each calibration test point, and the test table can be as shown in Table 2.

[0047]

[0048] Table 2

[0049] As shown in Table 2, the order of the calibration points in Table 2 can be the test order of the calibration test points in this application. It is not difficult to find that adjacent calibration test points with a predetermined logarithm have the same calibration speed or calibration current. For example, calibration points 1-15 all have a calibration speed of 1000 rpm, and the calibration current ranges from 10A to 150A, with an interval of 10A. Another example is calibration points 30 and 31, where the calibration current is the same, only the calibration speed is different. Therefore, after calibrating and testing the motor torque at calibration point 30, only the calibration speed needs to be changed to test the motor torque at calibration point 31, saving time in adjusting the calibration current. Based on the above scheme, this application adopts the serpentine test sequence shown in Table 2, which at least to a certain extent saves time in adjusting the calibration current and calibration speed.

[0050] Please see Figure 3 , Figure 3 A simplified flowchart of a calibration test method for a permanent magnet synchronous motor according to one embodiment of this application is shown. The method for testing the motor torque of the permanent magnet synchronous motor under different q-axis inductances based on the calibration speed and calibration current corresponding to the target calibration test point may include steps S301-S302:

[0051] Step S301: Obtain the rated d-axis inductance of the permanent magnet synchronous motor.

[0052] Step S302: Based on the calibration speed and calibration current corresponding to the target calibration test point, and the rated d-axis inductance, test the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances.

[0053] Please refer to the following. Figure 4 , Figure 4 A simplified flowchart of a calibration test method for a permanent magnet synchronous motor according to one embodiment of this application is shown. The method for obtaining the rated d-axis inductance of the permanent magnet synchronous motor may include steps S401-S402:

[0054] Step S401: Obtain the short-circuit current of the permanent magnet synchronous motor, the back electromotive force of the permanent magnet synchronous motor at the rated speed, and the rated frequency of the permanent magnet synchronous motor.

[0055] Step S402: Calculate the rated d-axis inductance of the permanent magnet synchronous motor based on the short-circuit current, the back EMF, and the rated frequency.

[0056] In this application, calibrating and testing the motor torque of the permanent magnet synchronous motor requires setting the d-axis inductance and q-axis inductance of the motor. The d-axis inductance is the rated d-axis inductance of the permanent magnet synchronous motor, which can be calculated based on the short-circuit current of the permanent magnet synchronous motor, the back electromotive force of the permanent magnet synchronous motor at its rated speed, and the rated frequency of the permanent magnet synchronous motor. The calculation formula is as follows:

[0057]

[0058] Among them, L d Let I be the d-axis inductance, I be the short-circuit current, E be the back EMF, and f be the rated frequency.

[0059] Please see Figure 5 , Figure 5 A simplified flowchart of a calibration test method for a permanent magnet synchronous motor according to one embodiment of this application is shown. The method for testing the motor torque of the permanent magnet synchronous motor under different q-axis inductances based on the calibration speed and calibration current corresponding to the target calibration test point may include steps S501-S503:

[0060] Step S501: Obtain the target motor q-axis inductance corresponding to the historical calibration test point adjacent to the target calibration test point, and use it as the initial motor q-axis inductance.

[0061] Step S502: Using the initial motor q-axis inductance as a reference and a preset inductance difference as an interval, determine at least one target motor q-axis inductance.

[0062] Step S503: Test the motor torque of the permanent magnet synchronous motor under the q-axis inductance of each target motor.

[0063] In this application, for a target calibration test point, a motor torque T10 corresponding to the initial motor q-axis inductance can be tested first; then, a preset inductance difference is added to the initial motor q-axis inductance, and the motor torque T11 is tested again, comparing the magnitudes of the two motor torques:

[0064] (1) If T11 is greater than T10, add at least one preset inductance difference to the initial motor q-axis inductance to obtain multiple target motor q-axis inductances, and test the motor torque corresponding to each target motor q-axis inductance.

[0065] (2) If T11 is less than T10, then reduce the initial motor q-axis inductance by at least one preset inductance difference to obtain multiple target motor q-axis inductances, and test the motor torque corresponding to each target motor q-axis inductance.

[0066] For example, for a target calibration test point, the initial motor q-axis inductance is 'a', the measured motor torque is 'b', and the preset inductance difference is 'c'. When the motor q-axis inductance is a+c, the measured motor torque is 'd'. If 'd' > 'c', multiple target motor q-axis inductances can be obtained: a+c, a+2c, a+3c, ..., a+nc, where n is an integer greater than or equal to 0. Multiple motor torques can be measured based on multiple target motor q-axis inductances.

[0067] For example, for a target calibration test point, the initial motor q-axis inductance is 'a', the measured motor torque is 'b', and the preset inductance difference is 'c'. When the motor q-axis inductance is 'a+c', the measured motor torque is 'd'. If 'd<c', multiple target motor q-axis inductances can be obtained: 'ac', 'a-2c', 'a-3c', ..., 'a-nc', where 'n' is an integer greater than or equal to 0. Multiple motor torques can be measured based on multiple target motor q-axis inductances.

[0068] Furthermore, in this application, for a target calibration test point, the initial q-axis inductance can be determined based on the target motor q-axis inductance of historical calibration test points. For example, given two existing calibration test points A and B, the target q-axis inductance corresponding to the maximum motor torque at calibration test point A is first calibrated and tested as 'a'. Therefore, when calibrating test point B, 'a' can be used as the initial q-axis inductance of calibration test point B.

[0069] Based on the above scheme, this application can accurately test multiple motor torques for each target calibration test point, effectively calibrating and testing the permanent magnet synchronous motor, while reducing the parameter setting amount when switching between two adjacent calibration test points, thus effectively improving calibration and testing efficiency.

[0070] In some embodiments of this application, before performing a calibration test, the winding temperature of the permanent magnet synchronous motor is obtained. If the winding temperature is greater than or equal to a predetermined temperature, the permanent magnet synchronous motor is cooled until the winding temperature is lower than the predetermined temperature before performing the current calibration test.

[0071] Based on the above scheme, this application can control the winding temperature of the permanent magnet synchronous motor, minimize the influence of irrelevant variables between each calibration test, and improve the accuracy and effectiveness of the calibration test process.

[0072] See Figure 6 , Figure 6 A simplified system architecture diagram of the permanent magnet synchronous motor calibration test described in one embodiment of this application is shown.

[0073] exist Figure 6 In the process, the main control unit 601 controls the measuring instrument 602, which acquires the torque and speed data of the motor under test 604 through the sensor 603. The main control unit 601 also controls the movement of the motor under test 604 through the motor controller 605. The main control unit 601 also controls the calibration current and the current of the auxiliary motor 607 through the power control cabinet 606. The auxiliary motor 607 is used to assist in controlling the speed of the motor under test 604.

[0074] Next, an embodiment of the apparatus of this application will be described with reference to the accompanying drawings.

[0075] See Figure 7 , Figure 7 A simplified structural diagram of a calibration and testing device for a permanent magnet synchronous motor according to one embodiment of this application is shown. The calibration and testing device 700 may include: an acquisition unit 701, a testing unit 702, and an output unit 703.

[0076] The specific configuration of the calibration test device 700 can be as follows:

[0077] The acquisition unit 701 is used to acquire a test table, which includes at least one calibration test point, wherein each calibration test point corresponds to the calibration speed and calibration current of the permanent magnet synchronous motor.

[0078] Test unit 702 is used to test the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances for each target calibration test point in the test table, based on the calibration speed and calibration current corresponding to the target calibration test point.

[0079] The output unit 703 is used to output the maximum motor torque corresponding to the target calibration test point, and the target motor q-axis inductance corresponding to the maximum motor torque.

[0080] See Figure 8 , Figure 8 A schematic diagram of a computer system architecture suitable for implementing embodiments of this application is shown.

[0081] It should be noted that, Figure 8 The computer system 800 shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0082] like Figure 8As shown, the computer system 800 includes a Central Processing Unit (CPU) 801, which can perform various appropriate actions and processes based on programs stored in Read-Only Memory (ROM) 802 or programs loaded from storage portion 808 into Random Access Memory (RAM) 803, such as performing the methods described in the above embodiments. The RAM 803 also stores various programs and data required for system operation. The CPU 801, ROM 802, and RAM 803 are interconnected via a bus 804. An Input / Output (I / O) interface 805 is also connected to the bus 804.

[0083] The following components are connected to I / O interface 805: an input section 806 including a keyboard, mouse, etc.; an output section 807 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 808 including a hard disk, etc.; and a communication section 809 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section 809 performs communication processing via a network such as the Internet. A drive 810 is also connected to I / O interface 805 as needed. A removable medium 811, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on drive 810 as needed so that computer programs read from it can be installed into storage section 808 as needed.

[0084] Specifically, according to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 809, and / or installed from removable medium 811. When the computer program is executed by central processing unit (CPU) 801, it performs various functions defined in the system of this application.

[0085] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such transmitted data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0086] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0087] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0088] In another aspect, this application also provides a computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the calibration test method for the permanent magnet synchronous motor described in the above embodiments.

[0089] In another aspect, this application also provides a computer-readable medium, which may be included in the electronic device described in the above embodiments; or it may exist independently and not assembled into the electronic device. The computer-readable medium carries one or more programs, which, when executed by the electronic device, cause the electronic device to implement the calibration and testing method for the permanent magnet synchronous motor described in the above embodiments.

[0090] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this application, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0091] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, touch terminal, or network device, etc.) to execute the method according to the embodiments of this application.

[0092] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0093] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A calibration and testing method for a permanent magnet synchronous motor, characterized in that, The method includes: Obtain a test table, which includes at least one calibration test point, wherein each calibration test point corresponds to the calibration speed and calibration current of the permanent magnet synchronous motor; For each target calibration test point in the test table, based on the calibration speed and calibration current corresponding to the target calibration test point, the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances is tested; Output the maximum motor torque corresponding to the target calibration test point, and the target motor q-axis inductance corresponding to the maximum motor torque; The step of testing the motor torque of the permanent magnet synchronous motor under different q-axis inductances, based on the calibration speed and calibration current corresponding to the target calibration test point, includes: Obtain the target motor q-axis inductance corresponding to the historical calibration test point adjacent to the target calibration test point, and use it as the initial motor q-axis inductance; Based on the initial motor q-axis inductance, and with a preset inductance difference as the interval, at least one target motor q-axis inductance is determined. Test the motor torque of the permanent magnet synchronous motor under the q-axis inductance of each target motor; For a target calibration test point, first measure the motor torque T10 corresponding to the initial motor q-axis inductance; then add a preset inductance difference to the initial motor q-axis inductance and measure the motor torque T11 again, comparing the magnitudes of the two motor torques: If T11 is greater than T10, add at least one preset inductance difference to the initial motor q-axis inductance to obtain multiple target motor q-axis inductances, and test the motor torque corresponding to each target motor q-axis inductance. If T11 is less than T10, then reduce the initial motor q-axis inductance by at least one preset inductance difference to obtain multiple target motor q-axis inductances, and test the motor torque corresponding to each target motor q-axis inductance.

2. The method according to claim 1, characterized in that, The acquisition of the test table includes: Obtain the speed range and current range of the permanent magnet synchronous motor; At least one rated speed is selected in the speed range, and at least one rated current is selected in the current range; The test table is constructed based on the at least one rated speed and the at least one rated current.

3. The method according to claim 2, characterized in that, For each target calibration test point in the test table, based on the calibration speed and calibration current corresponding to the target calibration test point, the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances is tested, including: Determine the test order of each calibration test point in the test table, wherein adjacent calibration test points of a predetermined logarithm have the same calibration speed or the same calibration current; According to the test order of each calibration test point in the test table, the target calibration test points are determined in the test table in sequence, and the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances is tested based on the calibration speed and calibration current corresponding to the target calibration test points.

4. The method according to claim 1, characterized in that, The step of testing the motor torque of the permanent magnet synchronous motor under different q-axis inductances, based on the calibration speed and calibration current corresponding to the target calibration test point, includes: Obtain the rated d-axis inductance of the permanent magnet synchronous motor; Based on the calibration speed and calibration current corresponding to the target calibration test point, and the rated d-axis inductance, the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances is tested.

5. The method according to claim 4, characterized in that, The step of obtaining the rated d-axis inductance of the permanent magnet synchronous motor includes: The short-circuit current of the permanent magnet synchronous motor, the back electromotive force of the permanent magnet synchronous motor at the rated speed, and the rated frequency of the permanent magnet synchronous motor are obtained. The rated d-axis inductance of the permanent magnet synchronous motor is calculated based on the short-circuit current, the back EMF, and the rated frequency.

6. The method according to claim 1, characterized in that, Before conducting a calibration test, the winding temperature of the permanent magnet synchronous motor is obtained. If the winding temperature is greater than or equal to a predetermined temperature, the permanent magnet synchronous motor is cooled until the winding temperature is lower than the predetermined temperature before conducting the calibration test.

7. A calibration and testing device for a permanent magnet synchronous motor, characterized in that, The device includes: The acquisition unit is used to acquire a test table, which includes at least one calibration test point, wherein each calibration test point corresponds to the calibration speed and calibration current of the permanent magnet synchronous motor. The test unit is used to test the motor torque of the permanent magnet synchronous motor under different motor q-axis inductances for each target calibration test point in the test table, based on the calibration speed and calibration current corresponding to the target calibration test point. The output unit is used to output the maximum motor torque corresponding to the target calibration test point, and the target motor q-axis inductance corresponding to the maximum motor torque; The step of testing the motor torque of the permanent magnet synchronous motor under different q-axis inductances, based on the calibration speed and calibration current corresponding to the target calibration test point, includes: Obtain the target motor q-axis inductance corresponding to the historical calibration test point adjacent to the target calibration test point, and use it as the initial motor q-axis inductance; Based on the initial motor q-axis inductance, and with a preset inductance difference as the interval, at least one target motor q-axis inductance is determined. Test the motor torque of the permanent magnet synchronous motor under the q-axis inductance of each target motor; For a target calibration test point, first measure the motor torque T10 corresponding to the initial motor q-axis inductance; then add a preset inductance difference to the initial motor q-axis inductance and measure the motor torque T11 again, comparing the magnitudes of the two motor torques: If T11 is greater than T10, add at least one preset inductance difference to the initial motor q-axis inductance to obtain multiple target motor q-axis inductances, and test the motor torque corresponding to each target motor q-axis inductance. If T11 is less than T10, then reduce the initial motor q-axis inductance by at least one preset inductance difference to obtain multiple target motor q-axis inductances, and test the motor torque corresponding to each target motor q-axis inductance.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one piece of program code, which is loaded and executed by a processor to perform the operations performed by the calibration test method for a permanent magnet synchronous motor as described in any one of claims 1 to 6.

9. A computer device, characterized in that, The computer device includes one or more processors and one or more memories, wherein at least one piece of program code is stored in the one or more memories, and the at least one piece of program code is loaded and executed by the one or more processors to perform the operations performed by the calibration test method for a permanent magnet synchronous motor as described in any one of claims 1 to 6.

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