Method for evaluating contribution degree of each area of magnetic steel to output torque of permanent magnet motor

Abstract

The invention relates to the technical field of permanent magnet motors, in particular to a method, device and equipment for evaluating the contribution degree of each magnetic steel area to the output torque of a permanent magnet motor and a readable storage medium, and the method comprises the steps: building a permanent magnet motor model, and calculating the rated output torque of the permanent magnet motor; according to the method, the magnetic steel in the permanent magnet motor is subjected to region division, the forward calculation contribution torque and the reverse calculation contribution torque of each region of the magnetic steel are respectively calculated in combination with a forward calculation method and a reverse calculation method, and then the contribution degree of each region of the magnetic steel to the output torque can be accurately evaluated in combination with the rated output torque of the permanent magnet motor. According to the invention, the effect and mechanism of each part of the magnetic steel in torque generation can be clearly revealed, and a scientific basis is provided for deeply understanding the influence of the permanent magnet on the motor performance; besides, the method can provide guidance for optimization design of the magnetic steel, and is helpful for improving the torque density and the operation efficiency of the permanent magnet motor, thereby having important significance in the aspects of improving the motor performance, reducing the material consumption and the like.

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 excellent performance of permanent magnet motors lies in the application of magnetic steel. By providing a constant magnetic field, magnetic steel significantly improves the power density and torque density of the motor, reduces energy loss and volume weight. The material properties of magnetic steel (such as magnetic energy product and anti-demagnetization ability) directly determine the efficiency and operating stability of the motor. Therefore, optimizing magnetic steel is the core technical path to improve the performance of permanent magnet motors and achieve high torque density. Evaluating the contribution of each area of ​​magnetic steel to the output torque of permanent magnet motors helps to optimize permanent magnets.

[0003] In existing literature and patents, the analysis of the contribution of permanent magnet motor torque can be summarized into macro and micro perspectives. From a macro perspective, for dual permanent magnet motors (i.e., motors that contain magnetic steel in both the stator and rotor), the contribution of the two magnetic steels to the motor output torque can be evaluated by analyzing the back electromotive force generated by the magnetic steels in the stator and rotor respectively; from a micro perspective, based on the Maxwell tensor method, the contribution of each harmonic of the air gap magnetic density to the permanent magnet motor torque can be analyzed. However, the above two methods focus on the overall contribution of one side or a piece of magnetic steel, and cannot further evaluate the contribution of each area of ​​a piece of magnetic steel to the output torque of the permanent magnet motor, which brings certain obstacles and difficulties to the optimization design of the magnetic steel, resulting in a lack of precise basis for the magnetic steel design, increased difficulty in magnetic steel design, and reduced material utilization efficiency, resulting in limited improvement in motor performance. 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 prior art can only evaluate the torque contribution generated by all the magnetic steels or a piece of magnetic steel on one side of the stator and rotor, but cannot be used to evaluate the contribution of each area of ​​the magnetic steel to the output torque of the permanent magnet motor, resulting in a lack of precise basis for the magnetic steel design, increased difficulty in the magnetic steel design, reduced material utilization efficiency, and limited improvement in motor performance.

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

[0006] A permanent magnet motor model is established, the residual magnetism 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;

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

[0008] The residual magnetism value of the permanent magnet material corresponding to the current area is set to a preset value, and the residual magnetism values ​​of the permanent magnet materials corresponding to the other areas are all set to 0, and the average output torque of the permanent magnet motor when it is in the rated current operation state is calculated as the positive calculation contribution torque of the current area;

[0009] The residual magnetism value of the permanent magnet material corresponding to the current area is set to 0, and the residual magnetism values ​​of the permanent magnet materials corresponding to the other areas are all set to preset values, and the average output torque of the permanent magnet motor when it is in the rated current operation state is calculated as the reverse calculated output torque of the current area; 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;

[0010] 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 of each area, the output torque contribution of each area is calculated.

[0011] Preferably, the reverse calculated contribution torque of the current region is calculated according to 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 Reverse calculation of contribution torque of each region; Indicates the rated output torque of the permanent magnet motor; Indicates 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 Output torque contribution of each area; Indicates Forward calculation contribution torque of each area; Indicates 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 comprises:

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

[0019] Preferably, a triangle 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 center angle of each area after equal division according to the preset number of areas; use the center position of the magnet as the vertex and use a measuring tool to mark a dividing line on the surface of the magnet according to the degree of the center angle of each area after equal division; divide the magnet into multiple areas according to 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 operation state is calculated as the rated output torque of the permanent magnet motor, and its expression is:

[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 establishment and torque calculation module: establish a permanent magnet motor model, set the residual magnetism value of the permanent magnet material corresponding to the magnetic steel to a preset value, calculate the average value of the output torque when the permanent magnet motor is in the rated current operating state, and use it 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 residual magnetism value of the permanent magnet material corresponding to the current area to the preset value, set the residual magnetism 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 in the rated current operation state, and use it as the forward calculation contribution torque of the current area;

[0029] Reverse calculation contribution torque acquisition module: set the residual magnetism value of the permanent magnet material corresponding to the current area to 0, set the residual magnetism 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 in the rated current operation state, and use it as the reverse calculation output torque of the current area; calculate the reverse calculation contribution torque of the current area according to 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: 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 of each area, the output torque contribution of each area is calculated.

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

[0032] Memory for storing computer programs;

[0033] A processor is used to implement the steps of the above-mentioned method for evaluating the contribution of each area 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, the steps of the above-mentioned method for evaluating the contribution of each region of the magnetic steel to the output torque of the permanent magnet motor are implemented.

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

[0036] The method for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor described in the present invention divides the magnetic steel in the permanent magnet motor into regions, and combines the forward and reverse calculation methods to respectively calculate the forward calculated contribution torque and the reverse calculated contribution torque of each magnetic steel region, and then combines the rated output torque of the permanent magnet motor to accurately evaluate the contribution of each magnetic steel region to the output torque; 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, 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. 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 according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0038] Figure 1 It is a flow chart of a method provided by the present invention for evaluating the contribution of each area 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 is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0042] In the design of existing permanent magnet motors, it is difficult to quantitatively evaluate the specific contribution of each area of ​​the magnetic steel to the output torque, which limits the optimization design and performance improvement of the magnetic steel. The purpose of the present invention is to provide a method that can accurately evaluate the contribution of each area of ​​the magnetic steel to the torque, and provide technical means for optimizing the magnetic steel design and improving the performance of the permanent magnet motor.

[0043] Reference Figure 1 As shown, Figure 1 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; specifically comprising:

[0044] S1: Establish a permanent magnet motor model, set the residual magnetism value of the permanent magnet material corresponding to the magnetic steel to the preset value, calculate the average value of the output torque when the permanent magnet motor is in the rated current operation state, and use it 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 areas;

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

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

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

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

[0052] S3: setting the residual magnetism value of the permanent magnet material corresponding to the current area to a preset value, setting the residual magnetism values ​​of the permanent magnet materials corresponding to the other areas to 0, and calculating the average output torque of the permanent magnet motor when it is in a rated current operation state as the forward calculation 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 area to 0, 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 in the rated current operation state, and use it as the reverse calculation output torque of the current area; calculate the reverse calculation contribution torque of the current area according to the difference between the rated output torque of the permanent magnet motor and the reverse calculation output torque of the current area, and its expression is:

[0055] ;

[0056] in, Indicates Reverse calculation of contribution torque of each region; Indicates the rated output torque of the permanent magnet motor; Indicates 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 calculated contribution torque of each area, and the reverse calculated contribution torque of each area, the output torque contribution of each area is calculated, and the expression is:

[0059] ;

[0060] in, Indicates Output torque contribution of each area; Indicates Forward calculation contribution torque of each area; Indicates 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 region of the magnetic steel to the output torque of the permanent magnet motor is verified, which specifically includes:

[0062] Step 1: Establish 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 operation 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 residual magnetism value of the permanent magnet material corresponding to the current area to 1.2T, and set the residual magnetism values ​​of the permanent magnet materials corresponding to the other 17 areas to 0, calculate the average output torque of the permanent magnet motor when it is in the rated current operation state, and use it as the forward calculation contribution torque of the current area; obtain the forward calculation contribution torque of each area in turn, and the specific results are shown in Table 1, in units of Nm;

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

[0066] Step 4: Set the residual magnetism value of the permanent magnet material corresponding to the current area to 0, set the residual magnetism values ​​of the permanent magnet materials corresponding to the other 17 areas to preset values, calculate the average output torque of the permanent magnet motor when it is in the rated current operation state, and use it as the reverse calculated output torque of the current area; obtain the reverse calculated output torque of each area in turn, and the specific results are shown in Table 2, in units of Nm;

[0067] Table 2 Reverse calculation output torque of 18 regions 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

[0068] 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, and its expression is:

[0069] ;

[0070] in, Indicates Reverse calculation of contribution torque of each region; Indicates the rated output torque of the permanent magnet motor; Indicates Reverse calculation of output torque in each area;

[0071] The reverse calculated contribution torque of each area is obtained in turn. The specific results are shown in Table 3, in Nm;

[0072] Table 3 Reverse calculation contribution torque of 18 regions 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

[0073] Step 5: 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, the output torque contribution of each area is calculated. The expression is:

[0074] ;

[0075] in, Indicates Output torque contribution of each area; Indicates Forward calculation contribution torque of each area; Indicates Reverse calculation of contribution torque of each region; Indicates the rated output torque of the permanent magnet motor;

[0076] The specific results of the output torque contribution of each area are shown in Table 4, with the unit being %.

[0077] Table 4 Output torque contribution of 18 regions 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

[0078] 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 the permanent magnet motor is also provided; specifically comprising:

[0079] Model establishment and torque calculation module 100: establish a permanent magnet motor model, set the residual magnetism value of the permanent magnet material corresponding to the magnetic steel to a preset value, calculate the average value of the output torque when the permanent magnet motor is in a rated current operating state, and use it as the rated output torque of the permanent magnet motor;

[0080] Magnetic steel area division module 200: based on the permanent magnet motor model, the magnetic steel is divided into multiple areas;

[0081] Forward calculation contribution torque acquisition module 300: set the residual magnetism value of the permanent magnet material corresponding to the current area to a preset value, set the residual magnetism values ​​of the permanent magnet materials corresponding to the other areas to 0, calculate the average output torque when the permanent magnet motor is in a rated current operation state, and use it as the forward calculation contribution torque of the current area;

[0082] The reverse calculation contribution torque acquisition module 400: sets the residual magnetism value of the permanent magnet material corresponding to the current area to 0, sets the residual magnetism values ​​of the permanent magnet materials corresponding to the other areas to preset values, calculates the average output torque of the permanent magnet motor when it is in the rated current operation state, and uses it as the reverse calculation output torque of the current area; calculates the reverse calculation contribution torque of the current area according to the difference between the rated output torque of the permanent magnet motor and the reverse calculation output torque of the current area;

[0083] 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.

[0084] 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, which will not be repeated here.

[0085] 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.

[0086] 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 region of the magnetic steel to the output torque of the permanent magnet motor are implemented.

[0087] 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 adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0088] 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 box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes 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 generate 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.

[0089] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate 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 A function specified in one or more boxes.

[0090] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0091] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A method for evaluating the contribution of each area of ​​magnetic steel to the output torque of a permanent magnet motor, characterized in that: include: A permanent magnet motor model is established, the residual magnetism 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; Based on the permanent magnet motor model, the magnetic steel is divided into multiple areas; The residual magnetism value of the permanent magnet material corresponding to the current area is set to a preset value, and the residual magnetism values ​​of the permanent magnet materials corresponding to the other areas are all set to 0, and the average output torque of the permanent magnet motor when it is in the rated current operation state is calculated as the positive calculation contribution torque of the current area; The residual magnetism value of the permanent magnet material corresponding to the current area is set to 0, and the residual magnetism values ​​of the permanent magnet materials corresponding to the other areas are all set to preset values, and the average output torque of the permanent magnet motor when it is in the rated current operation state is calculated as the reverse calculated output torque of the current area; 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; 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 of each area, the output torque contribution of each area is calculated.

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

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 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. The expression is: ； in, Indicates Output torque contribution of each area; Indicates Forward calculation contribution torque of each area; Indicates Reverse calculation of contribution torque of each region; Indicates the rated output torque of the permanent magnet motor.

4. A 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 comprises: Divide the magnetic steel into regions, among which Indicates the number of copies in the circumferential direction; Indicates the number of copies in radial direction; are all positive integers not less than 2; in this case, The area is represented as Regions, Represents the radial index of the region. Indicates the circumferential index of the region.

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: Using the triangle segmentation method, the magnetic steel is divided into multiple areas including: Determine the center position of the magnet; calculate the degree of the center angle of each area after equal division according to the preset number of areas; use the center position of the magnet as the vertex and use a measuring tool to mark a dividing line on the surface of the magnet according to the degree of the center angle of each area after equal division; divide the magnet into multiple areas according to the marked dividing lines.

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 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 operation state is calculated as the rated output torque of the permanent magnet motor, and its expression is: ； 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.

7. 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.

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: Model establishment and torque calculation module: establish a permanent magnet motor model, set the residual magnetism value of the permanent magnet material corresponding to the magnetic steel to a preset value, calculate the average value of the output torque when the permanent magnet motor is in the rated current operating state, and use it 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 residual magnetism value of the permanent magnet material corresponding to the current area to the preset value, set the residual magnetism 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 in the rated current operation state, and use it as the forward calculation contribution torque of the current area; Reverse calculation contribution torque acquisition module: set the residual magnetism value of the permanent magnet material corresponding to the current area to 0, set the residual magnetism 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 in the rated current operation state, and use it as the reverse calculation output torque of the current area; calculate the reverse calculation contribution torque of the current area according to 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: 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 of each area, the output torque contribution of each area is calculated.

9. 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 is used to implement the steps of a method for evaluating the contribution of each magnetic steel region to the output torque of a permanent magnet motor as described in any one of claims 1 to 7 when executing the computer program.

10. 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 a magnetic steel to the output torque of a permanent magnet motor as described in any one of claims 1 to 7.

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