Two-dimensional simulation correction method for radial ventilation channel permanent magnet wind power generator

Abstract

This invention belongs to the field of electromagnetic design and simulation technology for electric motors, and discloses a two-dimensional simulation correction method for a radially ventilated permanent magnet wind turbine. The method includes establishing a two-dimensional radial finite element model for the target radially ventilated permanent magnet wind turbine, obtaining the magnetic field line distribution and the magnetic flux density distribution of the stator teeth, and determining the main magnetic flux path and the equivalent permeability of the stator teeth; establishing a two-dimensional axial finite element model based on the main magnetic flux path, comprising multiple core segments separated by radial ventilation ducts, and setting the permeability of the stator portion within the core segments; establishing an infinitely long axial model; and based on the two-dimensional radial finite element model, the two-dimensional axial finite element model, and... The air gap magnetic flux density was obtained from the infinitely long axial model, and the equivalent three-dimensional air gap magnetic flux density distribution and equivalent axial length were calculated. The equivalent axial length was substituted into the two-dimensional radial finite element model for unloaded and / or loaded solutions to obtain the two-dimensional simulation correction results. By introducing the two-dimensional axial finite element model to correct the two-dimensional radial finite element model, the three-dimensional air gap magnetic flux density distribution was approximated by the analytical fitting formula. While maintaining the speed of two-dimensional finite element simulation, the calculation accuracy of the radial ventilation duct field edge effect was significantly improved. The unloaded electromotive force error can be controlled within 0.5%, and the load torque error can be controlled within 1%.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic design and simulation technology of motors, and specifically relates to a two-dimensional simulation correction method for a radial ventilation duct permanent magnet wind turbine. Background Technology

[0002] As wind turbine generators develop towards larger capacity and higher power density, heat dissipation has become a critical design issue. Adding radial ventilation channels to forced air cooling can effectively increase the heat dissipation area and improve ventilation volume. However, the presence of radial ventilation channels will change the magnetic flux path, producing a significant field edge effect and affecting the electromagnetic performance of the motor.

[0003] In the electromagnetic design of electric motors, finite element simulation is the primary method for performance verification. For axially symmetric structures, two-dimensional finite element simulation is typically used, based on the assumption of a uniform axial magnetic field, which offers fast computation speed. However, for motors with radial ventilation channels, the magnetic field is no longer uniformly distributed along the axial direction, and two-dimensional simulation neglects the leakage flux effect at the ventilation channels, leading to significant errors. More accurate three-dimensional finite element simulation can fully consider the end effects and the influence of radial ventilation channels, but it involves enormous computational demands, long simulation times, and extremely high requirements for computer memory and processor performance. Especially for large motors with a small number of unit motors, it is difficult to simplify modeling and cannot meet the needs of iterative optimization of multiple schemes in a compact design cycle.

[0004] Existing analytical correction methods, such as the equivalent length calculation formula based on Caterpillar theory, have a certain degree of accuracy in surface-mounted permanent magnet motors, but their calculation accuracy is low for salient-pole embedded rotor structures, and they can only be used for preliminary estimations. Some large manufacturers use empirical formulas for specific models, but their universality is poor and they cannot adapt to changes in topology.

[0005] Therefore, there is an urgent need to propose a simulation method that can accurately reflect the three-dimensional field edge effect caused by the radial ventilation duct and significantly reduce the computational resources and time costs, so as to meet the engineering design requirements of permanent magnet wind turbines. Summary of the Invention

[0006] Firstly, in view of the shortcomings of the existing technology, the purpose of this application is to provide a two-dimensional simulation correction method for a radial ventilation duct permanent magnet wind turbine, which can accurately reflect the three-dimensional field edge effect caused by the radial ventilation duct and significantly reduce the computational resources and time costs, so as to meet the engineering design requirements of permanent magnet wind turbines.

[0007] The objective of this application can be achieved through the following technical solutions: A two-dimensional simulation correction method for a radially ventilated permanent magnet wind turbine includes: A two-dimensional radial finite element model is established for the target radial ventilation duct permanent magnet wind turbine, and the magnetic field line distribution and stator tooth magnetic flux density distribution are obtained based on the two-dimensional radial finite element model. The main magnetic flux path is determined based on the magnetic field line distribution, and the equivalent permeability of the stator teeth is extracted based on the magnetic flux density distribution of the stator teeth. Based on the main magnetic flux path, a two-dimensional axial finite element model is established, which includes multiple core segments separated by radial ventilation channels along the axial direction. In each of the core segments, the permeability of the stator portion is set according to the equivalent permeability of the stator teeth, and maximum permeability regions are respectively set at both ends of the two-dimensional axial finite element model. The permeability of the maximum permeability regions is greater than the permeability of the core segment. Based on the two-dimensional axial finite element model, an axially infinitely long model is established, and the air gap magnetic flux density of the axially infinitely long model is obtained. Based on the air gap magnetic flux density obtained from the two-dimensional radial finite element model, the two-dimensional axial finite element model, and the infinitely long axial model, the equivalent three-dimensional air gap magnetic flux density is calculated, and the equivalent axial length of the target radial ventilation duct permanent magnet wind turbine is calculated based on the equivalent three-dimensional air gap magnetic flux density. Substitute the equivalent axial length into the two-dimensional radial finite element model to solve for no-load and / or load conditions, and obtain the two-dimensional simulation correction results.

[0008] Further, the step of determining the main magnetic flux path based on the magnetic field line distribution and extracting the equivalent permeability of the stator teeth based on the magnetic flux density distribution of the stator teeth includes: The magnetic field lines in the magnetic field line distribution are divided into at least one group of magnetic field lines according to their adjacency. In each of the magnetic field line groups, a magnetic field line path is selected that starts from the rotor N pole, passes through the air gap, stator teeth, stator yoke to the adjacent S pole, and then returns to the rotor N pole via the rotor yoke, and is used as the main magnetic flux path; Extract the magnetic flux density of each unit in the stator tooth region through which the main magnetic flux path passes, and solve the equivalent permeability of the stator tooth region based on the magnetic flux density of each unit.

[0009] Furthermore, the two-dimensional axial finite element model includes a first maximum permeability region, a second maximum permeability region, and multiple core segments located between the first maximum permeability region and the second maximum permeability region; Multiple core segments are spaced apart along the axial direction, and a radial ventilation channel is provided between two adjacent core segments; The first maximum permeability region and the second maximum permeability region are located at the two ends of the axial direction of the two-dimensional axial finite element model, and the permeability of the first maximum permeability region and the second maximum permeability region is greater than the permeability of the core segment.

[0010] Furthermore, based on the two-dimensional axial finite element model, an infinitely long axial model is established, and the air gap magnetic flux density of the infinitely long axial model is obtained, including: Based on the magnetic flux path direction and air gap position in the two-dimensional axial finite element model, an infinitely long axial model is established. In the axially infinitely long model, the radial ventilation channel and permanent magnet spacing are eliminated; Solve for the air gap magnetic flux density of the axially infinitely long model.

[0011] Further, the step of calculating the equivalent three-dimensional air gap magnetic flux density based on the air gap magnetic flux density obtained from the two-dimensional radial finite element model, the two-dimensional axial finite element model, and the axially infinite model respectively includes: The ratio of the air gap magnetic flux density obtained from the two-dimensional axial finite element model to the air gap magnetic flux density obtained from the axial infinite length model is calculated to obtain the axial magnetic flux density correction amount. The equivalent three-dimensional air gap magnetic flux density is obtained by multiplying the axial magnetic flux density correction by the air gap magnetic flux density obtained from the two-dimensional radial finite element model.

[0012] Furthermore, the equivalent three-dimensional air gap magnetic flux density is calculated according to the following relationship: in, For equivalent three-dimensional air gap magnetic flux density, The air gap magnetic flux density is obtained by solving a two-dimensional radial finite element model. The air gap magnetic flux density is obtained by solving a two-dimensional axial finite element model. The air gap magnetic flux density is solved for a model with infinite axial length. Location of the air gap radius. Circumferential position, This refers to the axial position.

[0013] Further, the calculation of the equivalent axial length of the permanent magnet wind turbine in the target radial ventilation duct based on the equivalent three-dimensional air gap magnetic flux density includes: Calculate the arithmetic mean of the equivalent three-dimensional air gap magnetic flux density; Obtain the reference value of the air gap magnetic flux density of the axially infinitely long model; The equivalent axial length is calculated based on the arithmetic mean, the air gap magnetic flux density reference value, and the original axial length of the target radial ventilation duct permanent magnet wind turbine.

[0014] Furthermore, the equivalent axial length is calculated according to the following relationship: In the formula, This is the equivalent axial length. The original axial length of the target radial ventilation duct permanent magnet wind turbine generator. This is the reference value for the air gap magnetic flux density of the infinitely long axial model. This is the arithmetic mean of the equivalent three-dimensional air gap magnetic flux density obtained through fitting.

[0015] Secondly, in view of the shortcomings of the prior art, the purpose of this application is to provide a two-dimensional simulation correction device for a radial ventilation duct permanent magnet wind turbine, which can accurately reflect the three-dimensional field edge effect caused by the radial ventilation duct and significantly reduce the computational resources and time costs of the simulation method, so as to meet the engineering design requirements of permanent magnet wind turbines.

[0016] The objective of this application can be achieved through the following technical solutions: A two-dimensional simulation correction device for a radially ventilated permanent magnet wind turbine includes: The two-dimensional radial modeling module is used to establish a two-dimensional radial finite element model for the target radial ventilation duct permanent magnet wind turbine, and to obtain the magnetic field line distribution and stator tooth magnetic flux density distribution based on the two-dimensional radial finite element model. The magnetic circuit information extraction module is used to determine the main magnetic flux path based on the magnetic field line distribution and to extract the equivalent permeability of the stator teeth based on the magnetic flux density distribution of the stator teeth. A two-dimensional axial modeling module is used to establish a two-dimensional axial finite element model based on the main magnetic flux path. The two-dimensional axial finite element model contains multiple core segments separated by radial ventilation channels along the axial direction. The material property setting module is used to set the permeability of the stator part in each core segment according to the equivalent permeability of the stator teeth, and to set maximum permeability regions at both ends of the two-dimensional axial finite element model, wherein the permeability of the maximum permeability regions is greater than the permeability of the core segment. An axially infinitely long modeling module is used to establish an axially infinitely long model based on the two-dimensional axially finite element model and to obtain the air gap magnetic flux density of the axially infinitely long model. The equivalent air gap magnetic flux density calculation module is used to calculate the equivalent three-dimensional air gap magnetic flux density based on the air gap magnetic flux density obtained from the two-dimensional radial finite element model, the two-dimensional axial finite element model, and the axial infinite length model, respectively. An equivalent axial length calculation module is used to calculate the equivalent axial length of the target radial ventilation duct permanent magnet wind turbine based on the equivalent three-dimensional air gap magnetic flux density. The correction solution module is used to substitute the equivalent axial length into the two-dimensional radial finite element model for no-load and / or load solution to obtain the two-dimensional simulation correction result.

[0017] Thirdly, in view of the shortcomings of the prior art, the purpose of this application is to provide an electronic device that can accurately reflect the three-dimensional field edge effect caused by the radial ventilation channel and significantly reduce the computational resources and time costs of simulation, so as to meet the engineering design requirements of permanent magnet wind turbines.

[0018] The objective of this application can be achieved through the following technical solutions: An electronic device includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the two-dimensional simulation correction method as described in the first aspect.

[0019] The beneficial effects of this application are: This invention modifies the two-dimensional radial finite element model by introducing a two-dimensional axial finite element model and uses an analytical fitting formula to approximate the three-dimensional air gap magnetic flux density distribution. While maintaining the speed of two-dimensional finite element simulation, it significantly improves the calculation accuracy of the radial ventilation duct field edge effect. The no-load electromotive force error can be controlled within 0.5%, and the load torque error can be controlled within 1%. Compared to three-dimensional finite element simulation, the method of this invention significantly reduces the number of meshes and the degrees of freedom of the solution, reduces the consumption of computing resources and simulation time, and can shorten the time by more than an order of magnitude. It is suitable for multi-scheme comparison and optimization iteration in the early stage of design. The method of this invention, through a parametrically modeled two-dimensional axial finite element model, is compatible with various radial ventilation duct topologies, such as ventilation ducts in both the stator and rotor, ventilation ducts only in the stator with segmented magnets, and ventilation ducts only in the stator with continuous magnets, thus exhibiting strong versatility. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall process of the method of the present invention; Figure 2 This is a schematic diagram of the magnetic field line distribution of the two-dimensional radial finite element model in step S1 of the present invention; Figure 3 This is a schematic diagram of the structure of the two-dimensional axial finite element model in step S2 of the present invention.

[0022] Figure 4This is a schematic diagram of the axially infinitely long model in step S3 of the present invention.

[0023] Figure 5 Figure (a) shows the comparison between the air gap magnetic flux density fitting results and the three-dimensional finite element simulation results in step S4 of this invention. Figure (b) shows the air gap magnetic flux density comparison at the axial position corresponding to the middle of the second segment of the stator and rotor, and Figure (a) shows the air gap magnetic flux density comparison at the axial position corresponding to the middle of the radial ventilation duct. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] Example 1: This embodiment provides a two-dimensional simulation correction method for a radially ventilated permanent magnet wind turbine generator. The radially ventilated permanent magnet wind turbine generator includes a stator, a rotor, an air gap, and permanent magnets. The radial ventilation duct can be set on the stator and / or rotor and extends radially to form a ventilation space. The radial ventilation duct divides the core into multiple core segments in the axial direction, so that the magnetic flux density of the air gap forms different axial distribution states at the corresponding positions of the core segments and the corresponding positions of the radial ventilation duct.

[0026] like Figure 1 As shown, the method of this embodiment includes steps S101 to S107, wherein step S101 is used to establish a two-dimensional radial finite element model and obtain basic magnetic field data; step S102 is used to extract the main magnetic flux path and the equivalent permeability of the stator teeth from the basic magnetic field data; step S103 is used to establish a two-dimensional axial finite element model including the core section, the corresponding region of the radial ventilation channel, and the region of maximum permeability; step S104 is used to establish an axially infinitely long model and obtain the reference air gap magnetic flux density; step S105 is used to calculate the equivalent three-dimensional air gap magnetic flux density distribution based on the air gap magnetic flux density of the three models; step S106 is used to convert the equivalent three-dimensional air gap magnetic flux density distribution into the equivalent axial length; and step S107 is used to substitute the equivalent axial length back into the two-dimensional radial finite element model and obtain the two-dimensional simulation correction result.

[0027] Step S101: Establish a two-dimensional radial finite element model for the target radial ventilation duct permanent magnet wind turbine, and obtain the magnetic field line distribution and stator tooth magnetic flux density distribution based on the two-dimensional radial finite element model.

[0028] In step S101, the target radial ventilation duct permanent magnet wind turbine is the object to be corrected by two-dimensional simulation. The two-dimensional radial finite element model is a finite element model established with the radial section of the target radial ventilation duct permanent magnet wind turbine as the object. The two-dimensional radial finite element model is used to represent the relative positional relationship of the stator, rotor, air gap and permanent magnet in the radial section, and is used to generate the basic magnetic field data required to subsequently determine the main magnetic flux path and the equivalent magnetic permeability of the stator teeth.

[0029] In this application, a corresponding two-dimensional radial finite element model can be established in the finite element simulation analysis software ANSYS Maxwell or JMAG environment. The model selects the cross section at the middle position of the motor axis, ignores the axial variation, and assumes that the magnetic field is uniformly distributed along the axis. It is used to characterize the ideal two-dimensional magnetic field distribution when the influence of the radial ventilation duct on the electromagnetic performance is ignored.

[0030] Appropriate excitations and boundary conditions were applied to the model, and a static magnetic field simulation analysis was performed, as follows: The inputs for step S101 include the geometric parameters, material parameters, permanent magnet parameters, air gap parameters, core segment parameters, and radial ventilation duct parameters of the target radial ventilation duct permanent magnet wind turbine. The geometric parameters include the stator inner diameter, stator outer diameter, rotor inner diameter, rotor outer diameter, number of poles, number of slots, and original axial length. The material parameters include the magnetization characteristic data of the stator core material and rotor core material. The permanent magnet parameters include the permanent magnet material, permanent magnet position, permanent magnet thickness, and magnetization direction. The air gap parameters include the air gap radius position and air gap length. The core segment parameters include the number of core segments, the axial position of the core segments, and the width of the core segments. The radial ventilation duct parameters include the number of radial ventilation ducts, the width of the radial ventilation duct, and the axial position of the radial ventilation duct.

[0031] When establishing a two-dimensional radial finite element model, the stator region, rotor region, air gap region, and permanent magnet region are established according to the radial cross-sectional geometry of the target radial ventilation duct permanent magnet wind turbine. The air gap region is located between the stator region and the rotor region. The permanent magnet region is set in the rotor region at the position corresponding to the permanent magnet of the target motor. The stator region forms a model region corresponding to the stator teeth and stator yoke. The rotor region forms a model region corresponding to the rotor yoke and permanent magnet support region.

[0032] In the two-dimensional radial finite element model, the material properties of the stator and rotor regions can be determined according to the corresponding core material. - The material properties of the permanent magnet region can be set according to the remanence, coercivity and magnetization direction of the permanent magnet material, the air gap region can be set according to the permeability of air, and the stator slot region can be set according to the air region or the winding equivalent region. The setting of the material properties enables the two-dimensional radial finite element model to output the magnetic field line distribution and magnetic flux density distribution corresponding to the radial cross section magnetic circuit of the target motor.

[0033] Two-dimensional radial finite element models can be established using an all-pole model, an electromagnetic periodic model, or a repeating element model. The all-pole model is suitable for observing the complete circumferential magnetic field distribution and the magnetic circuit relationship between multiple magnetic poles. The electromagnetic periodic model is suitable for situations where the target motor has a periodic symmetric relationship. The repeating element model is suitable for reducing the computational area while ensuring that the relative relationships between the air gap position, stator tooth position, and rotor permanent magnet position remain unchanged.

[0034] After solving the magnetic field based on the two-dimensional radial finite element model, the magnetic field distribution is extracted along the air gap region, stator tooth region, stator yoke region and rotor side region. The magnetic flux density value of the stator tooth region is extracted using finite element elements as indexes, thereby forming magnetic field distribution data and stator tooth magnetic flux density distribution data. The magnetic field distribution data is used in step S102 to determine the main magnetic flux path, and the stator tooth magnetic flux density distribution data is used in step S102 to extract the equivalent permeability of the stator tooth.

[0035] Step S102: Determine the main magnetic flux path based on the magnetic field line distribution, and extract the equivalent permeability of the stator teeth based on the magnetic flux density distribution of the stator teeth.

[0036] In step S102, the main magnetic flux path is the path representing the main magnetic flux flow direction determined from the magnetic field line distribution obtained in step S101. The main magnetic flux path is used as the model construction benchmark for the two-dimensional axial finite element model. The equivalent permeability of the stator teeth is material property data obtained based on the magnetic flux density distribution of the stator teeth and the magnetization characteristics of the stator core material. The equivalent permeability of the stator teeth is used to set the permeability of the stator part in the two-dimensional axial finite element model.

[0037] When processing magnetic field distribution data, multiple magnetic field lines can be divided into at least one group according to their spatial adjacency in the air gap region, stator tooth region, and stator yoke region. The spatial adjacency can be determined based on the degree of radial proximity of the magnetic field lines passing through the same stator tooth region, passing through adjacent stator tooth regions, within the air gap region, within the same magnetic pole region, or within the stator yoke region.

[0038] In each group of magnetic field lines, a path representing the direction of magnetic flux flow in that group is selected as the main magnetic flux path, such as... Figure 2As shown, the main magnetic flux path is selected as the magnetic field line that starts from the N pole of the rotor, passes through the air gap, stator teeth, stator yoke to the adjacent S pole, and then returns to the N pole of the rotor via the rotor yoke. This path can establish the magnetic circuit correspondence between the rotor side, air gap side and stator side, and provide a reference for setting the lateral position in the two-dimensional axial finite element model.

[0039] When processing the magnetic flux density distribution data of the stator teeth, the magnetic flux density value of each element in the stator tooth region is read using the finite element element as an index, and the permeability data of the corresponding element is obtained according to the magnetic flux density value and the magnetization characteristic data of the stator core material, thereby forming the equivalent permeability data of the stator teeth. The equivalent permeability data of the stator teeth includes the element number, element position, magnetic flux density value and equivalent permeability value.

[0040] The equivalent magnetic permeability of the stator teeth can be obtained through... - Curve lookup table - The results are obtained through curve interpolation, reading finite element post-processing results, or material property mapping. - Curve lookup tables are suitable when the magnetic flux density value corresponds to a discrete point on the material curve. - Curve interpolation is suitable for cases where the magnetic flux density value is located between discrete points of adjacent material curves. Finite element post-processing result reading is suitable for cases where the solution software can directly output the equivalent permeability of the corresponding region. Material property mapping is suitable for cases where the regional permeability data in the two-dimensional radial finite element model is written into the corresponding region of the two-dimensional axial finite element model.

[0041] When the material properties of the two-dimensional axial finite element model are set in units of regions, the equivalent permeability values ​​of multiple finite element elements in the stator tooth region are processed into equivalent permeability values ​​of the region, and the equivalent permeability values ​​of the region are written into the region corresponding to the stator part in the two-dimensional axial finite element model; when the material properties of the two-dimensional axial finite element model are set in units of meshes or partitions, the equivalent permeability values ​​of the corresponding meshes or partitions are written into the corresponding stator parts in the two-dimensional axial finite element model.

[0042] The main magnetic flux path data and stator tooth equivalent permeability data obtained in step S102 are then fed into step S103. The main magnetic flux path data is used to determine the expansion reference of the two-dimensional axial finite element model in the magnetic circuit direction, and the stator tooth equivalent permeability data is used to determine the permeability of the stator part in each core segment in the two-dimensional axial finite element model, so that the two-dimensional axial finite element model can inherit the stator tooth magnetic information in the two-dimensional radial finite element model.

[0043] Step S103: Establish a two-dimensional axial finite element model based on the main magnetic flux path. The two-dimensional axial finite element model includes multiple core segments separated by radial ventilation channels along the axial direction. In each core segment, the permeability of the stator part is set according to the equivalent permeability of the stator teeth. Maximum permeability regions are set at both ends of the two-dimensional axial finite element model. The permeability of the maximum permeability regions is greater than the permeability of the core segment.

[0044] In step S103, the two-dimensional axial finite element model is a finite element model constructed with the motor axis as one direction and the magnetic circuit position through which the main magnetic flux path passes as the other direction. The core segment is a core unit formed by dividing the radial ventilation channel in the axial direction. The maximum permeability region is a model region set at the axial end of the two-dimensional axial finite element model and whose permeability is greater than that of the core segment.

[0045] The inputs for step S103 include the main magnetic flux path data, stator tooth equivalent permeability data, number of core segments, radial ventilation channel position, and radial ventilation channel width obtained in step S102. The main magnetic flux path data determines the unfolding reference of the two-dimensional axial finite element model in the magnetic circuit direction. The number of core segments and the radial ventilation channel position determine the segmentation relationship of the two-dimensional axial finite element model in the axial direction. The radial ventilation channel width determines the width of the interval region between adjacent core segments. The stator tooth equivalent permeability data determines the material properties of the stator part within each core segment.

[0046] When establishing a two-dimensional axial finite element model, the main magnetic flux path obtained in step S102 is used as a cross section. The stator-side magnetic circuit position, air gap position and rotor-side magnetic circuit position through which the main magnetic flux path passes are mapped sequentially to the stator-side magnetic circuit region, air gap partition region and rotor-side magnetic circuit region in the transverse direction of the two-dimensional axial finite element model. The motor axis is taken as the longitudinal direction of the two-dimensional axial finite element model. In this way, the two-dimensional axial finite element model can not only retain the magnetic circuit hierarchy corresponding to the main magnetic flux path, but also express the distribution relationship of the core section and radial ventilation channel along the axial direction.

[0047] like Figure 3 As shown, in one specific embodiment, the two-dimensional axial finite element model mainly includes a first end maximum permeability part, a stator additional length part, a stator yoke part, a stator tooth part, an open slot part, a slot opening part, an air gap partition part, a radial ventilation channel part, a rotor surface part, a permanent magnet interval part, a rotor yoke part, a rotor additional length part, and a second end maximum permeability part.

[0048] The stator additional length portion, stator yoke portion, stator tooth portion, slotted portion, and slot opening portion are located in the two-dimensional axial finite element model at positions corresponding to the stator-side magnetic circuit. The air gap segmentation portion is located between the stator-side magnetic circuit region and the rotor-side magnetic circuit region. The rotor surface portion, permanent magnet interval portion, rotor yoke portion, and rotor additional length portion are located in the two-dimensional axial finite element model at positions corresponding to the rotor-side magnetic circuit. The radial ventilation duct portion is arranged between adjacent core segments and corresponds to the axial position of the radial ventilation duct of the target radial ventilation duct permanent magnet wind turbine.

[0049] The additional length portion of the stator and the additional length portion of the rotor are used to form corresponding two-dimensional axial finite element models in conjunction with different main magnetic flux paths. In the models corresponding to different magnetic field lines, the transverse magnetic circuit length of the two-dimensional axial finite element model can be adapted to the main magnetic flux path obtained in step S102 by adjusting the parameters of the additional length portion of the stator and / or the additional length portion of the rotor, thereby characterizing the path differences of different main magnetic flux paths on the stator side and the rotor side.

[0050] In the longitudinal direction of the two-dimensional axial finite element model, multiple core segments are spaced apart along the axial direction, and a radial ventilation duct is set between two adjacent core segments. The width of the core segment in the longitudinal direction can be consistent with the axial width of the corresponding core segment in the target radial ventilation duct permanent magnet wind turbine, and the width of the radial ventilation duct in the longitudinal direction can be consistent with the axial width of the target radial ventilation duct. Alternatively, the model size can be scaled proportionally while maintaining the relative positional relationship between the core segment and the radial ventilation duct.

[0051] In each core segment, the permeability of different regions is set separately. The permeability of the stator tooth section, the slot section, and the slot opening section is set to the equivalent permeability of each part of the stator tooth section at the corresponding radial position extracted in step S102. The corresponding radial position refers to the mapping position of the stator tooth section, the adjacent area of ​​the slot section, and the adjacent area of ​​the slot opening through which the main magnetic flux path passes in the two-dimensional radial finite element model in the two-dimensional axial finite element model.

[0052] By setting the permeability of the stator tooth section, the slot section, and the slot opening section to the equivalent permeability of each part of the stator tooth section at the corresponding radial position, the stator side magnetic circuit in the two-dimensional axial finite element model can not only reflect the distribution relationship between the axial core section and the radial ventilation channel, but also take into account the magnetic permeability differences formed by the stator tooth slot structure and local magnetization state in the two-dimensional radial finite element model.

[0053] For other core components in the two-dimensional axial finite element model, including the stator yoke, rotor surface, rotor yoke, and other regions corresponding to the rotor core, their permeability can be set according to the actual BH curve of the selected silicon steel sheet material or core material. For the air gap section, radial ventilation channel section, and permanent magnet interval section, the corresponding material properties can be set according to their corresponding air region, non-core region, or permanent magnet interval region.

[0054] The first and second maxima of magnetic permeability are respectively located at the two ends of the axial direction of the two-dimensional axial finite element model. Their permeability is set to a constant greater than that of the core material, preferably a constant much greater than that of the core material, such as a model region with a relative permeability of 1,000,000. The first and second maxima of magnetic permeability are used to make the magnetic lines of force form a closed loop at the end of the model without changing the magnetic permeability relationship of the stator side, air gap side and rotor side inside a single core segment.

[0055] The first and second end-maximum permeability portions can be strip-shaped model regions, block-shaped model regions, or magnetically conductive boundary regions covering the ends of the main magnetic flux path, extending laterally along the two-dimensional axial finite element model. Their lateral coverage can at least cover the stator-side magnetic circuit region, air gap partition region, and rotor-side magnetic circuit region corresponding to the end of the main magnetic flux path at the model end. Their axial width can be set according to the model solution stability and magnetic field line closure requirements.

[0056] For topologies where both the stator and rotor have ventilation channels, regions corresponding to the radial ventilation channels are set on both the stator and rotor sides in the two-dimensional axial finite element model. For topologies where only the stator has ventilation channels and the rotor magnets are segmented, regions corresponding to the radial ventilation channels are set on the stator side in the two-dimensional axial finite element model, and permanent magnet intervals corresponding to the magnet segments are set on the rotor side. For topologies where only the stator has ventilation channels and the rotor magnets are continuously laid, regions corresponding to the radial ventilation channels are set on the stator side in the two-dimensional axial finite element model, and the rotor side maintains a continuous rotor-side magnetic circuit region corresponding to the continuously laid magnet structure.

[0057] After completing the region construction, parameter setting of the additional length part, material property setting of each core segment, and end-maximum permeability setting of the two-dimensional axial finite element model, the two-dimensional axial finite element model is solved, and the air gap magnetic flux density data of the air gap partition part in the two-dimensional axial finite element model at different axial positions are extracted. The air gap magnetic flux density data includes air gap position, axial position, and magnetic flux density value, and is used as the input for step S105 to calculate the equivalent three-dimensional air gap magnetic flux density distribution.

[0058] Step S104: Establish an infinitely long axial model based on the two-dimensional axial finite element model, and obtain the air gap magnetic flux density of the infinitely long axial model.

[0059] In step S104, the infinitely long axial model is a reference model established based on the two-dimensional axial finite element model. It is used to output the air gap magnetic flux density of the infinitely long axial model. This air gap magnetic flux density and the air gap magnetic flux density of the two-dimensional axial finite element model are used together to determine the axial magnetic flux density correction amount.

[0060] The inputs for step S104 include model structure data, main magnetic flux path data, air gap location data, and material property data of the two-dimensional axial finite element model. The model structure data is used to determine the basic geometric relationship of the axially infinite model. The main magnetic flux path data is used to maintain the correspondence between the axially infinite model and the two-dimensional axial finite element model in the magnetic circuit direction. The air gap location data is used to enable the two types of models to extract the air gap magnetic flux density at the corresponding positions. The material property data is used to maintain the correspondence between the axially infinite model and the two-dimensional axial finite element model in the material settings of the core region and the air gap region.

[0061] When establishing the axially infinitely long model, the air gap position, the position of the main magnetic flux path, and the core material properties corresponding to the two-dimensional axial finite element model are retained, and a reference model corresponding to the axially infinitely long condition is formed in the axial direction. The lateral position of the axially infinitely long model still corresponds to the unfolded position of the main magnetic flux path in the two-dimensional axial finite element model.

[0062] In one specific implementation, such as Figure 4 As shown, the axial dimension of the two-dimensional axial finite element model can be extended to a length greater than the total width of the radial ventilation channel to obtain an axially infinitely long model; in another specific embodiment, the axially infinitely long model can also be obtained through periodic boundary conditions; in yet another specific embodiment, a simplified axially infinitely long model can be established by using the average length of different main magnetic flux paths.

[0063] In the axially infinitely long model, no radial ventilation channel and permanent magnet interval are set, thereby making the air gap magnetic flux density of the axially infinitely long model the benchmark air gap magnetic flux density for comparison with the two-dimensional axial finite element model. The treatment of not setting the radial ventilation channel and permanent magnet interval does not change the matching relationship between the axially infinitely long model and the two-dimensional axial finite element model at the corresponding positions of the air gap and the main magnetic flux path.

[0064] After solving the axially infinitely long model, the magnetic flux density data on the air gap centerline of the axially infinitely long model is extracted to obtain the air gap magnetic flux density data of the axially infinitely long model. The air gap magnetic flux density data includes the air gap position, axial position and magnetic flux density value, and is input into step S105 together with the air gap magnetic flux density data of the two-dimensional axial finite element model obtained in step S103.

[0065] The air gap magnetic flux density data of the axially infinitely long model obtained in step S104 is entered into step S105, and a ratio calculation is performed with the air gap magnetic flux density data of the two-dimensional axial finite element model obtained in step S103, thereby forming the axial magnetic flux density correction amount of the two-dimensional axial finite element model relative to the axially infinitely long model.

[0066] Step S105: Calculate the equivalent three-dimensional air gap magnetic flux density distribution based on the air gap magnetic flux density obtained from the two-dimensional radial finite element model, the two-dimensional axial finite element model, and the axial infinite length model.

[0067] In step S105, the equivalent three-dimensional air gap magnetic flux density distribution is the result of calculating the air gap magnetic flux density from the two-dimensional radial finite element model, the two-dimensional axial finite element model, and the axially infinite model. The equivalent three-dimensional air gap magnetic flux density distribution is based on the air gap radius position. Circumferential position and axial position It is a variable and serves as the input for calculating the equivalent axial length in step S106.

[0068] The inputs for step S105 include air gap magnetic flux density data obtained from a two-dimensional radial finite element model, air gap magnetic flux density data obtained from a two-dimensional axial finite element model, and air gap magnetic flux density data obtained from an axially infinite model. The air gap magnetic flux density data obtained from the two-dimensional radial finite element model is used to provide the air gap radius position. and circumferential position The basic magnetic flux density distribution on the surface, and the air gap magnetic flux density data obtained from the two-dimensional axial finite element model are used to provide the location of the air gap radius. and axial position The axial magnetic flux density variation, and the air gap magnetic flux density data obtained from the infinitely long axial model are used to provide the air gap radius position. and axial position The reference magnetic flux density.

[0069] When extracting air gap magnetic flux density data from the three models, sampling can be performed at the air gap centerline or at the same air gap radius. The sampled data can be the instantaneous value, amplitude, or magnetic flux density value of the sampling point obtained from the solution. The specific sampling method should maintain a positional correspondence among the three models.

[0070] Extracting the air gap radius position from a two-dimensional radial finite element model and circumferential position The corresponding air gap magnetic flux density is denoted as Extracting the air gap radius position from a two-dimensional axial finite element model and axial position The corresponding air gap magnetic flux density is denoted as Extracting the air gap radius position from an axially infinitely long model and axial position The corresponding air gap magnetic flux density is denoted as .

[0071] When performing data correspondence, air gap magnetic flux density data are extracted at the same or corresponding air gap positions in the two-dimensional axial finite element model and the axially infinitely long model, and different circumferential positions are selected in the two-dimensional radial finite element model. The closest two-dimensional axial finite element model is selected for the calculation, thereby enabling... , and According to the position of air gap radius Circumferential position and axial position A corresponding relationship is formed.

[0072] When calculating the equivalent three-dimensional air gap magnetic flux density distribution, and The ratio of this to the axial magnetic flux density correction is used as the axial magnetic flux density correction value, and this axial magnetic flux density correction value is compared with... Multiplying them together yields the equivalent three-dimensional air gap magnetic flux density. ,in, In the formula, For equivalent three-dimensional air gap magnetic flux density, The air gap magnetic flux density is obtained by solving a two-dimensional radial finite element model. The air gap magnetic flux density is obtained by solving a two-dimensional axial finite element model. The air gap magnetic flux density is solved for a model with infinite axial length. Location of the air gap radius. Circumferential position, This refers to the axial position.

[0073] like Figure 5 As shown, Figure 5 This is a comparison chart of the equivalent three-dimensional air gap magnetic flux density fitting results and the three-dimensional finite element simulation results. Figure 5 (a) The axial position corresponding to the middle of the second segment of the stator and rotor. Figure 5 (b) The axial position of the middle part of the radial ventilation duct is represented by the horizontal axis as the spatial angle and the vertical axis as the air gap magnetic flux density. The N2D curve in the figure represents the equivalent three-dimensional air gap magnetic flux density result calculated using this embodiment, and the 3D curve represents the three-dimensional finite element simulation result.

[0074] Depend on Figure 5It can be seen that at the middle position of the core segment and the middle position of the radial ventilation channel, the N2D curve and the 3D curve have a good correspondence in terms of the peak position of the air gap magnetic flux density, the fluctuation trend, and the variation law in the spatial angle direction. This indicates that after the air gap magnetic flux density of the two-dimensional radial finite element model is corrected by the air gap magnetic flux density ratio of the two-dimensional axial finite element model and the axial infinite length model, an equivalent three-dimensional air gap magnetic flux density distribution with a trend similar to that of the three-dimensional finite element simulation results can be obtained.

[0075] Therefore, through step S105, the circumferential air gap magnetic flux density distribution in the two-dimensional radial finite element model is combined with the axial magnetic flux density correction amount of the two-dimensional axial finite element model relative to the axially infinite model, thereby obtaining an equivalent three-dimensional air gap magnetic flux density distribution that simultaneously includes circumferential distribution and axial variation.

[0076] Step S106: Calculate the equivalent axial length of the permanent magnet wind turbine generator in the target radial ventilation duct based on the equivalent three-dimensional air gap magnetic flux density distribution.

[0077] In step S106, the equivalent axial length is an axial length parameter calculated based on the equivalent three-dimensional air gap magnetic flux density distribution. This equivalent axial length is used to replace the original axial length in the two-dimensional radial finite element model and serves as the model parameter for unloaded and / or loaded solutions in step S107.

[0078] The inputs for step S106 include the equivalent three-dimensional air gap magnetic flux density distribution obtained in step S105, the original axial length of the target radial ventilation duct permanent magnet wind turbine, and the air gap magnetic flux density reference value of the axially infinite model, wherein the original axial length is denoted as... The reference value of the air gap magnetic flux density for the axially infinitely long model is denoted as... .

[0079] Calculating the equivalent axial length At that time, multiple sampling points were selected along the centerline of the air gap, and the corresponding data for each sampling point were read. Then, the equivalent three-dimensional air gap magnetic flux density values ​​of multiple sampling points are arithmetically averaged to obtain... The sampling points can be arranged in circumferential and axial positions, and correspond to the air gap magnetic flux density extraction points in the two-dimensional radial finite element model, the two-dimensional axial finite element model, and the axially infinite model. Wherein: In the formula, This is the equivalent axial length. The original axial length of the target radial ventilation duct permanent magnet wind turbine generator. This is the reference value for the air gap magnetic flux density of the infinitely long axial model. This is the arithmetic mean of the equivalent three-dimensional air gap magnetic flux density obtained through fitting.

[0080] In step S106, the equivalent three-dimensional air gap magnetic flux density distribution is converted into an equivalent axial length that can be directly called by the two-dimensional radial finite element model, so that the two-dimensional radial finite element model can introduce axial magnetic flux density correction information without changing the radial cross-section modeling structure.

[0081] Step S107: The equivalent axial length Substitute the two-dimensional radial finite element model into the solution for no-load and / or load to obtain the two-dimensional simulation correction results.

[0082] In step S107, the two-dimensional simulation correction result is to adjust the equivalent axial length. The electromagnetic performance results obtained after substituting into the two-dimensional radial finite element model may include no-load induced electromotive force, load torque, air gap magnetic flux density, magnetic field line distribution, or other electromagnetic performance data.

[0083] The inputs for step S107 include a two-dimensional radial finite element model and an equivalent axial length. And the excitation parameters corresponding to no-load and / or loaded conditions, where the equivalent axial length Replace the original axial length in the two-dimensional radial finite element model The excitation parameters corresponding to the no-load and / or loaded conditions are used to determine the solution conditions of the two-dimensional radial finite element model.

[0084] Under no-load conditions, the excitation conditions of the two-dimensional radial finite element model are set according to the no-load state, and the two-dimensional radial finite element model after replacing the axial length is solved to obtain the no-load induced electromotive force and the no-load air gap magnetic flux density; under load conditions, the excitation conditions of the two-dimensional radial finite element model are set according to the load state, and the two-dimensional radial finite element model after replacing the axial length is solved to obtain the load torque and the load air gap magnetic flux density.

[0085] Under different current conditions, different speed conditions, or different radial ventilation duct topology types, steps S101 to S107 can be repeated to obtain the two-dimensional simulation correction results under the corresponding conditions or topology types. The two-dimensional simulation correction results are still generated by solving the two-dimensional radial finite element model, but include axial correction information introduced by the equivalent axial length.

[0086] In a specific application example, the target radial ventilation duct permanent magnet wind turbine is a 13MW semi-direct drive permanent magnet wind turbine with an embedded salient pole rotor, a radial ventilation duct width of 5mm, and a core segmentation of 10. The method described in steps S101 to S107 is applied to three topology types: ventilation ducts are provided on both the stator and rotor, ventilation ducts are provided on only the stator and the rotor magnets are segmented, and ventilation ducts are provided on only the stator and the rotor magnets are laid continuously.

[0087] In this specific application example, a two-dimensional radial finite element model, a two-dimensional axial finite element model, and an infinitely long axial model are established in the ANSYS Maxwell environment. The two-dimensional radial finite element model uses an intermediate section, and the two-dimensional axial finite element model follows... Figure 3 The structure shown is parametrically modeled, with the region of maximum permeability set to a relative permeability of [missing value]. After solving the model region, calculate the equivalent three-dimensional air gap magnetic flux density distribution according to step S105, and calculate the equivalent axial length according to step S106. Then, substitute the equivalent axial length into the two-dimensional radial finite element model for no-load and load calculations.

[0088] In this specific application example, for the three topology types, the errors between the fundamental amplitude of the no-load induced electromotive force obtained from the two-dimensional radial finite element model after substituting the equivalent axial length and the three-dimensional finite element simulation results are as follows: , , The load torque errors are respectively , , The time for a single simulation is reduced by approximately [amount missing] compared to the three-dimensional finite element method. The consumption of computing resources is reduced by approximately .

[0089] Example 2: This embodiment also provides a two-dimensional simulation correction device for a radial ventilation duct permanent magnet wind turbine. The device may include a two-dimensional radial modeling module, a magnetic circuit information extraction module, a two-dimensional axial modeling module, a material property setting module, an axial infinite length modeling module, an equivalent air gap magnetic flux density calculation module, an equivalent axial length calculation module, and a correction solution module.

[0090] The two-dimensional radial modeling module is used to execute step S101. Specifically, the two-dimensional radial modeling module reads the geometric parameters, magnetic material parameters, permanent magnet parameters, air gap parameters, core segmentation parameters, and radial ventilation duct parameters of the target radial ventilation duct permanent magnet wind turbine, establishes a two-dimensional radial finite element model, and generates the magnetic field line distribution and stator tooth magnetic flux density distribution based on the two-dimensional radial finite element model. The two-dimensional radial modeling module sends the magnetic field line distribution and stator tooth magnetic flux density distribution to the magnetic circuit information extraction module.

[0091] The magnetic circuit information extraction module executes step S102. Specifically, the module reads the magnetic field line distribution, divides the magnetic field lines into at least one group according to their adjacency, and selects the main magnetic flux path in each group. The module also reads the magnetic flux density distribution of the stator teeth and calculates the equivalent permeability of the stator teeth based on the magnetic flux density of each element within the stator tooth region. The module then sends the main magnetic flux path to the two-dimensional axial modeling module and the equivalent permeability of the stator teeth to the material property setting module.

[0092] The two-dimensional axial modeling module is used to perform the model building process in step S103. Specifically, the two-dimensional axial modeling module reads the main magnetic flux path and radial ventilation channel parameters, and builds a two-dimensional axial finite element model containing multiple core segments separated by radial ventilation channels along the axial direction. The two-dimensional axial modeling module sends the two-dimensional axial finite element model to the material property setting module and the axial infinite length modeling module.

[0093] The material property setting module is used to execute the material property setting process in step S103. Specifically, the material property setting module reads the equivalent permeability of the stator teeth and sets the permeability of the stator section in each core segment according to the equivalent permeability of the stator teeth. The material property setting module also sets maximum permeability regions at both ends of the two-dimensional axial finite element model, and makes the permeability of the maximum permeability regions greater than the permeability of the core segment. The two-dimensional axial finite element model after completing the material property setting is used to solve the air gap magnetic flux density of the two-dimensional axial finite element model.

[0094] The axial infinite length modeling module is used to execute step S104. Specifically, the axial infinite length modeling module reads the two-dimensional axial finite element model, establishes an axial infinite length model based on the magnetic flux path direction and air gap position in the two-dimensional axial finite element model, and obtains the air gap magnetic flux density of the axial infinite length model. The axial infinite length modeling module sends the air gap magnetic flux density of the axial infinite length model to the equivalent air gap magnetic flux density calculation module.

[0095] The equivalent air gap magnetic flux density calculation module is used to execute step S105. Specifically, the equivalent air gap magnetic flux density calculation module reads the air gap magnetic flux density of the two-dimensional radial finite element model, the air gap magnetic flux density of the two-dimensional axial finite element model, and the air gap magnetic flux density of the axially infinitely long model. It calculates the ratio between the air gap magnetic flux density of the two-dimensional axial finite element model and the air gap magnetic flux density of the axially infinitely long model to obtain the axial magnetic flux density correction amount. Then, it multiplies the axial magnetic flux density correction amount with the air gap magnetic flux density of the two-dimensional radial finite element model to obtain the equivalent three-dimensional air gap magnetic flux density. The equivalent air gap magnetic flux density calculation module sends the equivalent three-dimensional air gap magnetic flux density to the equivalent axial length calculation module.

[0096] The equivalent axial length calculation module is used to execute step S106. Specifically, the equivalent axial length calculation module reads the equivalent three-dimensional air gap magnetic flux density, the reference value of the air gap magnetic flux density of the axially infinite model, and the original axial length of the target radial ventilation duct permanent magnet wind turbine. It calculates the arithmetic mean of the equivalent three-dimensional air gap magnetic flux density and calculates the equivalent axial length based on the arithmetic mean, the reference value of the air gap magnetic flux density, and the original axial length. The equivalent axial length calculation module sends the equivalent axial length to the correction solution module.

[0097] The correction solution module is used to execute step S107. Specifically, the correction solution module reads the two-dimensional radial finite element model and the equivalent axial length, replaces the original axial length in the two-dimensional radial finite element model with the equivalent axial length, and performs no-load and / or load condition solutions on the two-dimensional radial finite element model after replacing the axial length to obtain the two-dimensional simulation correction results.

[0098] Example 3: This embodiment also provides an electronic device, which includes a processor and a memory, wherein the memory stores a computer program. When the processor executes the computer program, it can read the model data, magnetic material data, radial ventilation duct data, and operating condition data of the target radial ventilation duct permanent magnet wind turbine, and execute the data processing procedures in steps S101 to S107 to output the two-dimensional simulation correction results.

[0099] Specifically, the processor can perform data processing actions such as establishing a two-dimensional radial finite element model, obtaining the magnetic field line distribution, obtaining the magnetic flux density distribution of the stator teeth, determining the main magnetic flux path, extracting the equivalent permeability of the stator teeth, establishing a two-dimensional axial finite element model, setting the maximum permeability region, establishing an infinitely long axial model, extracting the air gap magnetic flux density, calculating the equivalent three-dimensional air gap magnetic flux density, calculating the equivalent axial length, and correcting and solving the two-dimensional radial finite element model.

[0100] Example 4: This embodiment also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, it implements the data processing flow described in steps S101 to S107.

[0101] In one optional implementation, the computer program may include instructions for reading model data, solving magnetic fields, extracting magnetic circuit information, writing material properties, calculating air gap magnetic flux density, calculating equivalent axial length, and outputting two-dimensional simulation correction results. After executing the above instructions, the processor can generate two-dimensional simulation correction results corresponding to the target radial ventilation duct permanent magnet wind turbine.

[0102] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0103] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of the claims of this application.

Claims

1. A two-dimensional simulation correction method for a radial-ventilation-path permanent-magnet wind power generator, characterized in that, include: A two-dimensional radial finite element model is established for the target radial ventilation duct permanent magnet wind turbine, and the magnetic field line distribution and stator tooth magnetic flux density distribution are obtained based on the two-dimensional radial finite element model. The main magnetic flux path is determined based on the magnetic field line distribution, and the equivalent permeability of the stator teeth is extracted based on the magnetic flux density distribution of the stator teeth. Based on the main magnetic flux path, a two-dimensional axial finite element model is established, which includes multiple core segments separated by radial ventilation channels along the axial direction. In each of the core segments, the permeability of the stator portion is set according to the equivalent permeability of the stator teeth, and maximum permeability regions are respectively set at both ends of the two-dimensional axial finite element model. The permeability of the maximum permeability regions is greater than the permeability of the core segment. Based on the two-dimensional axial finite element model, an axially infinitely long model is established, and the air gap magnetic flux density of the axially infinitely long model is obtained. Based on the air gap magnetic flux density obtained from the two-dimensional radial finite element model, the two-dimensional axial finite element model, and the infinitely long axial model, the equivalent three-dimensional air gap magnetic flux density is calculated, and the equivalent axial length of the target radial ventilation duct permanent magnet wind turbine is calculated based on the equivalent three-dimensional air gap magnetic flux density. Substitute the equivalent axial length into the two-dimensional radial finite element model to solve for no-load and / or load conditions, and obtain the two-dimensional simulation correction results.

2. The two-dimensional simulation correction method according to claim 1, characterized in that, The step of determining the main magnetic flux path based on the magnetic field line distribution and extracting the equivalent permeability of the stator teeth based on the magnetic flux density distribution of the stator teeth includes: The magnetic field lines in the magnetic field line distribution are divided into at least one group of magnetic field lines according to their adjacency. In each of the magnetic field line groups, a magnetic field line path is selected that starts from the rotor N pole, passes through the air gap, stator teeth, stator yoke to the adjacent S pole, and then returns to the rotor N pole via the rotor yoke, and is used as the main magnetic flux path; Extract the magnetic flux density of each unit in the stator tooth region through which the main magnetic flux path passes, and solve the equivalent permeability of the stator tooth region based on the magnetic flux density of each unit.

3. The two-dimensional simulation correction method of claim 1, wherein The two-dimensional axial finite element model includes a first maximum permeability region, a second maximum permeability region, and multiple core segments located between the first maximum permeability region and the second maximum permeability region. Multiple core segments are spaced apart along the axial direction, and a radial ventilation channel is provided between two adjacent core segments; The first maximum permeability region and the second maximum permeability region are located at the two ends of the axial direction of the two-dimensional axial finite element model, and the permeability of the first maximum permeability region and the second maximum permeability region is greater than the permeability of the core segment.

4. The two-dimensional emendation method of claim 1, wherein Based on the two-dimensional axial finite element model, an axially infinitely long model is established, and the air gap magnetic flux density of the axially infinitely long model is obtained, including: Based on the magnetic flux path direction and air gap position in the two-dimensional axial finite element model, an infinitely long axial model is established. In the axially infinitely long model, the radial ventilation channel and permanent magnet spacing are eliminated; Solve for the air gap magnetic flux density of the axially infinitely long model.

5. The two-dimensional emendation method of claim 1, wherein The calculation of the equivalent three-dimensional air gap magnetic flux density based on the air gap magnetic flux density obtained from the two-dimensional radial finite element model, the two-dimensional axial finite element model, and the axially infinite model respectively includes: The ratio of the air gap magnetic flux density obtained from the two-dimensional axial finite element model to the air gap magnetic flux density obtained from the axial infinite length model is calculated to obtain the axial magnetic flux density correction amount. The equivalent three-dimensional air gap magnetic flux density is obtained by multiplying the axial magnetic flux density correction by the air gap magnetic flux density obtained from the two-dimensional radial finite element model.

6. The two-dimensional simulation correction method according to claim 5, characterized in that, The equivalent three-dimensional air gap magnetic flux density is calculated according to the following relationship: wherein, is the equivalent three-dimensional air-gap flux density, is the air-gap flux density solved by the two-dimensional radial finite element model, is the air-gap flux density solved by the two-dimensional axial finite element model, is the air-gap flux density solved by the axial infinite length model, is the air-gap radius position, is the circumferential position, is the axial position.

7. The two-dimensional simulation correction method according to claim 1, characterized in that, The calculation of the equivalent axial length of the permanent magnet wind turbine in the target radial ventilation duct based on the equivalent three-dimensional air gap magnetic flux density includes: Calculate the arithmetic mean of the equivalent three-dimensional air gap magnetic flux density; Obtain the reference value of the air gap magnetic flux density of the axially infinitely long model; The equivalent axial length is calculated based on the arithmetic mean, the air gap magnetic flux density reference value, and the original axial length of the target radial ventilation duct permanent magnet wind turbine.

8. The two-dimensional simulation correction method according to claim 7, characterized in that, The equivalent axial length is calculated according to the following relationship: in, This is the equivalent axial length. The original axial length of the target radial ventilation duct permanent magnet wind turbine generator. This is the reference value for the air gap magnetic flux density of the infinitely long axial model. This is the arithmetic mean of the equivalent three-dimensional air gap magnetic flux density obtained through fitting.

9. A two-dimensional simulation correction device for a radial ventilation duct permanent magnet wind turbine, characterized in that, include: The two-dimensional radial modeling module is used to establish a two-dimensional radial finite element model for the target radial ventilation duct permanent magnet wind turbine, and to obtain the magnetic field line distribution and stator tooth magnetic flux density distribution based on the two-dimensional radial finite element model. The magnetic circuit information extraction module is used to determine the main magnetic flux path based on the magnetic field line distribution and to extract the equivalent permeability of the stator teeth based on the magnetic flux density distribution of the stator teeth. A two-dimensional axial modeling module is used to establish a two-dimensional axial finite element model based on the main magnetic flux path. The two-dimensional axial finite element model contains multiple core segments separated by radial ventilation channels along the axial direction. The material property setting module is used to set the permeability of the stator part in each core segment according to the equivalent permeability of the stator teeth, and to set maximum permeability regions at both ends of the two-dimensional axial finite element model, wherein the permeability of the maximum permeability regions is greater than the permeability of the core segment. An axially infinitely long modeling module is used to establish an axially infinitely long model based on the two-dimensional axially finite element model and to obtain the air gap magnetic flux density of the axially infinitely long model. The equivalent air gap magnetic flux density calculation module is used to calculate the equivalent three-dimensional air gap magnetic flux density based on the air gap magnetic flux density obtained from the two-dimensional radial finite element model, the two-dimensional axial finite element model, and the axial infinite length model, respectively. An equivalent axial length calculation module is used to calculate the equivalent axial length of the target radial ventilation duct permanent magnet wind turbine based on the equivalent three-dimensional air gap magnetic flux density. The correction solution module is used to substitute the equivalent axial length into the two-dimensional radial finite element model for no-load and / or load solution to obtain the two-dimensional simulation correction result.

10. An electronic device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the two-dimensional simulation correction method as described in any one of claims 1 to 8.

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