A method for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor

Abstract

The present invention relates to the field of permanent magnet motor technology, and specifically refers to a method, device, equipment and readable storage medium for evaluating the contribution of each region of magnetic steel to the output torque of a permanent magnet motor, comprising: establishing a permanent magnet motor model and calculating the rated output torque of the permanent magnet motor; dividing the magnetic steel in the permanent magnet motor into regions, and combining forward and reverse calculation methods to calculate the forward calculation contribution torque and reverse calculation contribution torque of each region of the magnetic steel respectively, and then combining the rated output torque of the permanent magnet motor to accurately evaluate the contribution of each region of the magnetic steel to the output torque. The present invention can not only clearly reveal the role and mechanism of each part of the magnetic steel in torque generation, but also provide a scientific basis for in-depth understanding of the influence of permanent magnets on motor performance; in addition, the method can also provide guidance for the optimal design of magnetic steel, help to improve the torque density and operating efficiency of the permanent magnet motor, and thus has important significance in improving motor performance and reducing material consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet motors, and in particular to a method, device, equipment and readable storage medium for evaluating the contribution of various regions of magnetic steel to the output torque of a permanent magnet motor. Background Art

[0002] The key to achieving the excellent performance of permanent magnet motors lies in the application of magnets. By providing a constant magnetic field, magnets significantly improve the motor's power density and torque density, reducing energy loss and volume and weight. The material properties of magnets (such as magnetic energy product and demagnetization resistance) directly determine the motor's efficiency and operational stability. Therefore, optimizing magnets is a core technical approach to improving permanent magnet motor performance and achieving high torque density. Evaluating the contribution of each magnet region to the motor's output torque helps optimize permanent magnets.

[0003] In existing literature and patents, the analysis of the contribution of permanent magnet motor torque can be divided into macroscopic and microscopic perspectives. From a macroscopic perspective, for dual permanent magnet motors (i.e., motors containing magnets in both the stator and rotor), the contribution of the two magnets to the motor output torque can be evaluated by separately analyzing the back electromotive force generated by the magnets in the stator and rotor; from a microscopic perspective, based on the Maxwell tensor method, the contribution of each harmonic of the air gap flux density to the permanent magnet motor torque can be analyzed. However, the above two methods focus on the overall contribution of one side or one piece of magnet, and cannot further evaluate the contribution of each area of ​​a piece of magnet to the permanent magnet motor output torque. This brings certain obstacles and difficulties to the optimization design of the magnet, resulting in a lack of precise basis for magnet design, increased difficulty in magnet design, reduced material utilization efficiency, and limited motor performance improvement. Summary of the Invention

[0004] To this end, the technical problem to be solved by the present invention is to overcome the problem that the existing technology can only evaluate the torque contribution generated by all the magnets or a piece of magnet on one side of the stator and rotor, and cannot be used to evaluate the contribution of each area of ​​the magnet to the output torque of the permanent magnet motor, resulting in a lack of accurate basis for magnet design, increased difficulty in magnet design, reduced material utilization efficiency, and limited improvement in motor performance.

[0005] To solve the above technical problems, the present invention provides a method for evaluating the contribution of each region of magnetic steel to the output torque of a permanent magnet motor, comprising:

[0006] A permanent magnet motor model is established, the remanence value of the permanent magnet material corresponding to the magnetic steel is set to a preset value, and the average output torque when the permanent magnet motor is operating at rated current is calculated as the rated output torque of the permanent magnet motor;

[0007] Based on the permanent magnet motor model, the magnetic steel is divided into multiple areas;

[0008] The remanence value of the permanent magnet material corresponding to the current area is set to a preset value, and the remanence values ​​of the permanent magnet materials corresponding to the other areas are all set to 0. The average output torque of the permanent magnet motor when it is operating at rated current is calculated as the forward calculated contribution torque of the current area.

[0009] The remanence value of the permanent magnet material corresponding to the current region is set to 0, and the remanence values ​​of the permanent magnet materials corresponding to the other regions are all set to preset values. The average output torque of the permanent magnet motor when it is operating at rated current is calculated as the reverse calculated output torque of the current region. The reverse calculated contribution torque of the current region is calculated based on the difference between the rated output torque of the permanent magnet motor and the reverse calculated output torque of the current region.

[0010] The output torque contribution of each area is calculated based on the rated output torque of the permanent magnet motor, the forward calculated contribution torque of each area, and the reverse calculated contribution torque.

[0011] Preferably, the reverse calculated contribution torque of the current region is calculated based on the difference between the rated output torque of the permanent magnet motor and the reverse calculated output torque of the current region, and the expression thereof is:

[0012] ;

[0013] in, Indicates the Reverse calculation of contribution torque of each region; Indicates the rated output torque of the permanent magnet motor; Indicates the The output torque is calculated by reverse calculation of each area.

[0014] Preferably, the output torque contribution of each region is calculated based on the rated output torque of the permanent magnet motor, the forward calculated contribution torque of each region, and the reverse calculated contribution torque, and the expression thereof is:

[0015] ;

[0016] in, Indicates the Output torque contribution of each area; Indicates the Forward calculation of contribution torque of each area; Indicates the Reverse calculation of contribution torque of each region; Indicates the rated output torque of the permanent magnet motor.

[0017] Preferably, dividing the magnetic steel into various regions includes:

[0018] Divide the magnetic steel into regions, among which Indicates the number of shares in the circumferential direction; Indicates the number of radial copies; are all positive integers not less than 2; in this case, The area is represented as regions, Indicates the radial index of the region, Indicates the circumferential index of the region.

[0019] Preferably, a triangular segmentation method is used to divide the magnetic steel into multiple regions, including:

[0020] Determine the center position of the magnet; calculate the degree of the central angle of each area after equal division based on the preset number of areas; use a measuring tool to mark a dividing line on the surface of the magnet with the center position of the magnet as the vertex and the degree of the central angle of each area after equal division; divide the magnet into multiple areas based on the marked dividing lines.

[0021] Preferably, the remanence value of the permanent magnet material corresponding to the magnetic steel is set to a preset value, and the average value of the output torque when the permanent magnet motor is in a rated current operating state is calculated as the rated output torque of the permanent magnet motor, which is expressed as:

[0022] ;

[0023] in, Indicates the rated output torque of the permanent magnet motor; Indicates that the permanent magnet motor is in rated current operation state. Output torque at each moment; Indicates the total number of moments.

[0024] Preferably, the preset value is 1.2T.

[0025] The present invention also provides a device for evaluating the contribution of each region of magnetic steel to the output torque of a permanent magnet motor, comprising:

[0026] Model building and torque calculation module: This module builds a permanent magnet motor model, sets the remanence value of the permanent magnet material corresponding to the magnetic steel to a preset value, and calculates the average output torque when the permanent magnet motor is operating at rated current as the rated output torque of the permanent magnet motor.

[0027] Magnetic steel area division module: Based on the permanent magnet motor model, the magnetic steel is divided into multiple areas;

[0028] Forward calculation contribution torque acquisition module: Set the remanence value of the permanent magnet material corresponding to the current area to a preset value, and set the remanence values ​​of the permanent magnet materials corresponding to the other areas to 0. Calculate the average output torque of the permanent magnet motor when it is operating at rated current as the forward calculation contribution torque of the current area;

[0029] Reverse calculation contribution torque acquisition module: Set the remanence value of the permanent magnet material corresponding to the current area to 0, and set the remanence values ​​of the permanent magnet materials corresponding to the other areas to preset values. Calculate the average output torque of the permanent magnet motor when it is operating at rated current as the reverse calculation output torque of the current area; Calculate the reverse calculation contribution torque of the current area based on the difference between the rated output torque of the permanent magnet motor and the reverse calculation output torque of the current area;

[0030] Torque contribution calculation module: Calculates the output torque contribution of each area based on the rated output torque of the permanent magnet motor, the forward calculation contribution torque of each area, and the reverse calculation contribution torque.

[0031] The present invention also provides a device for evaluating the contribution of each region of magnetic steel to the output torque of a permanent magnet motor, comprising:

[0032] Memory for storing computer programs;

[0033] A processor is configured to implement the steps of the above-mentioned method for evaluating the contribution of each region of magnetic steel to the output torque of the permanent magnet motor when executing the computer program.

[0034] The present invention also provides a computer-readable storage medium, characterized in that it includes: a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, it implements the steps of the above-mentioned method for evaluating the contribution of each area of ​​magnetic steel to the output torque of a permanent magnet motor.

[0035] The above technical solution of the present invention has the following beneficial effects compared with the prior art:

[0036] The method described in the present invention is a method for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor. By dividing the magnetic steel in the permanent magnet motor into regions and combining forward and reverse calculation methods, the forward calculation contribution torque and reverse calculation contribution torque of each magnetic steel region are calculated respectively. Combined with the rated output torque of the permanent magnet motor, the contribution of each magnetic steel region to the output torque can be accurately evaluated. At the same time, it can not only clearly reveal the role and mechanism of each part of the magnetic steel in torque generation, but also provide a scientific basis for in-depth understanding of the influence of permanent magnets on motor performance. In addition, this method can also provide guidance for the optimal design of magnetic steel, help to improve the torque density and operating efficiency of the permanent magnet motor, and thus has important significance in improving motor performance and reducing material consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0038] Figure 1 This is a flow chart of a method provided by the present invention for evaluating the contribution of each region of magnetic steel to the output torque of a permanent magnet motor;

[0039] Figure 2 It is a permanent magnet motor model;

[0040] Figure 3 It is a schematic diagram of a device provided by the present invention for evaluating the contribution of each region of magnetic steel to the output torque of a permanent magnet motor. DETAILED DESCRIPTION

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0042] In existing permanent magnet motor designs, it is difficult to quantitatively assess the specific contribution of each magnet region to output torque, which limits magnet optimization and performance improvement. The present invention aims to provide a method that can accurately assess the torque contribution of each magnet region, providing a technical means for optimizing magnet design and improving permanent magnet motor performance.

[0043] Reference Figure 1 As shown, Figure 1 The present invention provides a method for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor; specifically comprising:

[0044] S1: Establish a permanent magnet motor model, set the remanence value of the permanent magnet material corresponding to the magnetic steel to a preset value, and calculate the average output torque when the permanent magnet motor is in the rated current operating state. This is used as the rated output torque of the permanent magnet motor. The expression is:

[0045] ;

[0046] in, Indicates the rated output torque of the permanent magnet motor; Indicates that the permanent magnet motor is in rated current operation state. Output torque at each moment; Indicates the total number of moments;

[0047] S2: Based on the permanent magnet motor model, the magnetic steel is divided into multiple regions;

[0048] In a specific embodiment of the present invention, dividing the magnetic steel into various regions includes:

[0049] Divide the magnetic steel into regions, among which Indicates the number of shares in the circumferential direction; Indicates the number of radial copies; are all positive integers not less than 2, can be equal; at this time, The area is represented as regions, Indicates the radial index of the region, Indicates the index of the area in the circumferential direction;

[0050] In addition, other segmentation methods can divide the magnetic steel into various regions. For example, the triangular segmentation method is used to divide the magnetic steel into multiple regions, including:

[0051] Determine the center position of the magnet; calculate the degree of the central angle of each area after equal division based on the preset number of areas; use a measuring tool to mark a dividing line on the surface of the magnet based on the degree of the central angle of each area after equal division, with the center position of the magnet as the vertex; divide the magnet into multiple areas according to the marked dividing lines;

[0052] S3: Set the remanence value of the permanent magnet material corresponding to the current area to a preset value, and set the remanence values ​​of the permanent magnet materials corresponding to the remaining areas to 0. Calculate the average output torque of the permanent magnet motor when it is operating at rated current, and use it as the forward calculated contribution torque of the current area.

[0053] Among them, in S3, the forward calculation contribution torque of each area is calculated by the forward calculation method;

[0054] S4: Set the remanence value of the permanent magnet material corresponding to the current region to 0, and set the remanence values ​​of the permanent magnet materials corresponding to the other regions to preset values. Calculate the average output torque of the permanent magnet motor when it is in the rated current operating state, and use it as the reverse calculated output torque of the current region. Calculate the reverse calculated contribution torque of the current region based on the difference between the rated output torque of the permanent magnet motor and the reverse calculated output torque of the current region. The expression is:

[0055] ;

[0056] in, Indicates the Reverse calculation of contribution torque of each region; Indicates the rated output torque of the permanent magnet motor; Indicates the Reverse calculation of output torque in each area;

[0057] Among them, in S4, the reverse calculation contribution torque of each area is calculated by the reverse calculation method;

[0058] S5: Based on the rated output torque of the permanent magnet motor, the forward calculation contribution torque of each area, and the reverse calculation contribution torque of each area, the output torque contribution of each area is calculated. The expression is:

[0059] ;

[0060] in, Indicates the Output torque contribution of each area; Indicates the Forward calculation of contribution torque of each area; Indicates the Reverse calculation of contribution torque of each region; Indicates the rated output torque of the permanent magnet motor.

[0061] Based on steps S1-S5, the effectiveness of the method provided by the present invention for evaluating the contribution of each magnetic steel region to the output torque of the permanent magnet motor is verified, specifically including:

[0062] Step 1: Create a permanent magnet motor model, such as Figure 2 As shown; the remanence value of the permanent magnet material corresponding to the magnetic steel is set to a preset value, and the average value of the output torque when the permanent magnet motor is in the rated current operating state is calculated as the rated output torque of the permanent magnet motor, and its value is 7.9825Nm;

[0063] Step 2: Divide the magnetic steel into 6*3 areas, where 6 represents the number of parts in the circumferential direction and 3 represents the number of parts in the radial direction;

[0064] Step 3: Set the remanence value of the permanent magnet material corresponding to the current region to 1.2T, and set the remanence values ​​of the permanent magnet materials corresponding to the other 17 regions to 0. Calculate the average output torque of the permanent magnet motor when it is operating at rated current, and use it as the forward calculated contribution torque of the current region. Obtain the forward calculated contribution torque of each region in turn. The specific results are shown in Table 1, in Nm.

[0065] Table 1 Forward calculation contribution torque of 18 regions

[0066] 0.1856 0.5077 0.6946 0.6946 0.5077 0.1856 0.1732 0.4727 0.645 0.645 0.4727 0.1732 0.1678 0.4579 0.6245 0.6245 0.4579 0.1678

[0067] Step 4: Set the remanence value of the permanent magnet material corresponding to the current region to 0, and set the remanence values ​​of the permanent magnet materials corresponding to the other 17 regions to preset values. Calculate the average output torque of the permanent magnet motor when it is operating at rated current, and use it as the reverse calculated output torque of the current region. Obtain the reverse calculated output torque of each region in turn. The specific results are shown in Table 2, in Nm.

[0068] Table 2 Reverse calculation output torque of 18 regions

[0069] 7.7921 7.4565 7.2634 7.2634 7.4565 7.7921 7.8032 7.4916 7.3128 7.3128 7.4916 7.8032 7.8094 7.5112 7.3404 7.3404 7.5112 7.8094

[0070] According to the difference between the rated output torque of the permanent magnet motor and the reverse calculated output torque of the current area, the reverse calculated contribution torque of the current area is calculated. The expression is:

[0071] ;

[0072] in, Indicates the Reverse calculation of contribution torque of each region; Indicates the rated output torque of the permanent magnet motor; Indicates the Reverse calculation of output torque in each area;

[0073] The reverse calculated contribution torque of each area is obtained in turn. The specific results are shown in Table 3 (unit: Nm);

[0074] Table 3 Reverse calculation contribution torque of 18 regions

[0075] 0.1904 0.526 0.7191 0.7191 0.526 0.1904 0.1793 0.4909 0.6697 0.6697 0.4909 0.1793 0.1731 0.4713 0.6421 0.6421 0.4713 0.1731

[0076] Step 5: Based on the rated output torque of the permanent magnet motor, the forward calculation contribution torque of each area, and the reverse calculation contribution torque of each area, calculate the output torque contribution of each area. The expression is:

[0077] ;

[0078] in, Indicates the Output torque contribution of each area; Indicates the Forward calculation of contribution torque of each area; Indicates the Reverse calculation of contribution torque of each region; Indicates the rated output torque of the permanent magnet motor;

[0079] The specific results of the output torque contribution of each area are shown in Table 4, with the unit being %.

[0080] Table 4 Output torque contribution of 18 regions

[0081] 2.36 6.47 8.85 8.85 6.47 2.36 2.21 6.04 8.23 8.23 6.04 2.21 2.14 5.82 7.93 7.93 5.82 2.14

[0082] Reference Figure 3 As shown, in a specific embodiment of the present invention, a device for evaluating the contribution of each region of magnetic steel to the output torque of a permanent magnet motor is also provided; specifically comprising:

[0083] Model establishment and torque calculation module 100: establishes a permanent magnet motor model, sets the remanence value of the permanent magnet material corresponding to the magnetic steel to a preset value, and calculates the average output torque when the permanent magnet motor is in a rated current operating state as the rated output torque of the permanent magnet motor;

[0084] Magnetic steel area division module 200: based on the permanent magnet motor model, divides the magnetic steel into multiple areas;

[0085] Forward calculation contribution torque acquisition module 300: sets the remanence value of the permanent magnet material corresponding to the current region to a preset value, sets the remanence values ​​of the permanent magnet materials corresponding to the remaining regions to 0, and calculates the average output torque of the permanent magnet motor when it is operating at rated current as the forward calculation contribution torque of the current region;

[0086] The reverse calculation contribution torque acquisition module 400 sets the remanence value of the permanent magnet material corresponding to the current region to 0, sets the remanence values ​​of the permanent magnet materials corresponding to the remaining regions to preset values, calculates the average output torque of the permanent magnet motor when it is operating at rated current, and uses this as the reverse calculation output torque of the current region; and calculates the reverse calculation contribution torque of the current region based on the difference between the rated output torque of the permanent magnet motor and the reverse calculation output torque of the current region.

[0087] The torque contribution calculation module 500 calculates the output torque contribution of each region based on the rated output torque of the permanent magnet motor, the forward calculation contribution torque of each region, and the reverse calculation contribution torque of each region.

[0088] The device of this embodiment is used to implement the aforementioned method for evaluating the contribution of each magnetic steel region to the output torque of the permanent magnet motor. Therefore, the specific implementation method of the device for evaluating the contribution of each magnetic steel region to the output torque of the permanent magnet motor can be seen in the embodiment part of the method for evaluating the contribution of each magnetic steel region to the output torque of the permanent magnet motor in the previous text. For example, the model establishment and torque calculation module 100, the magnetic steel region division module 200, the forward calculation contribution torque acquisition module 300, the reverse calculation contribution torque acquisition module 400, and the torque contribution calculation module 500 are respectively used to implement S1 to S5 in the above-mentioned method for evaluating the contribution of each magnetic steel region to the output torque of the permanent magnet motor. Therefore, its specific implementation method can refer to the description of the corresponding each part of the embodiment, and will not be repeated here.

[0089] In a specific embodiment of the present invention, a device for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor is also provided, including: a memory for storing a computer program; a processor for implementing the steps of the above-mentioned method for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor when executing the computer program.

[0090] In a specific embodiment of the present invention, a computer-readable storage medium is also provided, including: a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above-mentioned method for evaluating the contribution of each area of ​​magnetic steel to the output torque of a permanent magnet motor are implemented.

[0091] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0092] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0093] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0094] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0095] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor, characterized in that: include: A permanent magnet motor model is established, the remanence value of the permanent magnet material corresponding to the magnetic steel is set to a preset value, and the average output torque when the permanent magnet motor is operating at rated current is calculated as the rated output torque of the permanent magnet motor; Based on the permanent magnet motor model, the magnetic steel is divided into multiple areas; The remanence value of the permanent magnet material corresponding to the current area is set to a preset value, and the remanence values ​​of the permanent magnet materials corresponding to the other areas are all set to 0. The average output torque of the permanent magnet motor when it is operating at rated current is calculated as the forward calculated contribution torque of the current area. The remanence value of the permanent magnet material corresponding to the current region is set to 0, and the remanence values ​​of the permanent magnet materials corresponding to the other regions are all set to preset values. The average output torque of the permanent magnet motor when it is operating at rated current is calculated as the reverse calculated output torque of the current region. The reverse calculated contribution torque of the current region is calculated based on the difference between the rated output torque of the permanent magnet motor and the reverse calculated output torque of the current region. Based on the rated output torque of the permanent magnet motor, the forward calculation contribution torque of each area, and the reverse calculation contribution torque of each area, the output torque contribution of each area is calculated, and the expression is: Wherein, δ(x) represents the output torque contribution of the xth region; T e1 (x) represents the forward calculated contribution torque of the xth region; T e2 (x) represents the reverse calculated contribution torque of the x-th region; T e0 Indicates the rated output torque of the permanent magnet motor.

2. The method for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor according to claim 1, characterized in that: The reverse calculation contribution torque of the current region is calculated based on the difference between the rated output torque of the permanent magnet motor and the reverse calculation output torque of the current region. The expression is: T e2 (x)=T e0 -T′ e2 (x); Among them, T e2 (x) represents the reverse calculated contribution torque of the x-th region; T e0 Indicates the rated output torque of the permanent magnet motor; T' e2 (x) represents the reverse calculated output torque of the x-th region.

3. The method for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor according to claim 1, characterized in that: The step of dividing the magnetic steel into multiple regions includes: The magnetic steel is divided into m*n regions, where m represents the number of portions in the circumferential direction and n represents the number of portions in the radial direction. Both m and n are positive integers not less than 2. At this time, the xth region is represented as the (i, j)th region, where i represents the radial index of the region and j represents the circumferential index of the region.

4. The method for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor according to claim 1, characterized in that: Using the triangular segmentation method, the magnetic steel is divided into multiple areas including: Determine the center position of the magnet; calculate the degree of the central angle of each area after equal division based on the preset number of areas; use a measuring tool to mark a dividing line on the surface of the magnet with the center position of the magnet as the vertex and the degree of the central angle of each area after equal division; divide the magnet into multiple areas based on the marked dividing lines.

5. The method for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor according to claim 1, characterized in that: The remanence value of the permanent magnet material corresponding to the magnetic steel is set to a preset value, and the average value of the output torque when the permanent magnet motor is in the rated current operation state is calculated as the rated output torque of the permanent magnet motor, which is expressed as: Among them, T e0 Indicates the rated output torque of the permanent magnet motor; It represents the output torque at the ath moment when the permanent magnet motor is operating at rated current; N represents the total number of moments.

6. The method for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor according to claim 1, characterized in that: The preset value is 1.2T.

7. A device for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor, characterized in that: include: Model building and torque calculation module: This module builds a permanent magnet motor model, sets the remanence value of the permanent magnet material corresponding to the magnetic steel to a preset value, and calculates the average output torque when the permanent magnet motor is operating at rated current as the rated output torque of the permanent magnet motor. Magnetic steel area division module: Based on the permanent magnet motor model, the magnetic steel is divided into multiple areas; Forward calculation contribution torque acquisition module: Set the remanence value of the permanent magnet material corresponding to the current area to a preset value, and set the remanence values ​​of the permanent magnet materials corresponding to the other areas to 0. Calculate the average output torque of the permanent magnet motor when it is operating at rated current as the forward calculation contribution torque of the current area; Reverse calculation contribution torque acquisition module: Set the remanence value of the permanent magnet material corresponding to the current area to 0, and set the remanence values ​​of the permanent magnet materials corresponding to the other areas to preset values. Calculate the average output torque of the permanent magnet motor when it is operating at rated current as the reverse calculation output torque of the current area; Calculate the reverse calculation contribution torque of the current area based on the difference between the rated output torque of the permanent magnet motor and the reverse calculation output torque of the current area; Torque contribution calculation module: Calculates the output torque contribution of each area based on the rated output torque of the permanent magnet motor, the forward calculation contribution torque of each area, and the reverse calculation contribution torque.

8. A device for evaluating the contribution of each area of ​​magnetic steel to the output torque of a permanent magnet motor, characterized in that: include: Memory for storing computer programs; A processor, configured to implement the steps of a method for evaluating the contribution of each region of magnetic steel to the output torque of a permanent magnet motor as claimed in any one of claims 1 to 6 when executing the computer program.

9. A computer-readable storage medium, characterized in that include: The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a method for evaluating the contribution of each region of magnetic steel to the output torque of a permanent magnet motor as claimed in any one of claims 1 to 6.

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