Method, device, equipment and medium for analyzing motor stator core interference amount

Abstract

This application proposes a method, apparatus, equipment, and medium for analyzing the interference fit of a motor stator core. The method includes: performing finite element modeling of a vehicle motor assembly to obtain a motor assembly model, wherein the motor assembly model includes multiple component models, including a stator core model; establishing a first constraint in the bolt engagement area of ​​the motor assembly model and establishing a second constraint between each component model; defining the materials of the multiple component models and defining the boundaries of the motor assembly model to obtain a target motor assembly model; obtaining a preset stator core interference fit design strategy and analyzing the target motor assembly model based on the preset stator core interference fit design strategy to obtain the analysis results of the multiple component models; and determining whether the core model meets the preset interference fit design conditions based on the analysis results. Therefore, the interference fit of the motor stator core can be accurately evaluated, effectively shortening the R&D cycle and reducing testing costs.

Description

Technical Field

[0001] This application relates to the field of motor design technology, and in particular to a method, apparatus, equipment, and medium for analyzing the interference fit of a motor stator core. Background Technology

[0002] With the development of the new energy vehicle industry, the application of high-speed motors is becoming increasingly widespread, and the reliability of motor assemblies is receiving much attention. The stator core, as a core component of the motor, plays a crucial role in constructing the magnetic circuit, supporting the windings, and stabilizing the current. During operation, it must withstand loads such as gravity, high temperature, and high torque, and generate vibrations. If the interference fit between the stator core and the housing is improperly designed, insufficient interference can easily lead to core loosening, overheating, and burnout, affecting motor performance and lifespan. Currently, stator interference fit design mainly relies on engineering experience analogy and rough estimation, lacking a systematic and precise preliminary verification method. Often, it requires bench testing after the physical prototype is manufactured. If the test fails, repeated design modifications, re-prototyping, and retesting are necessary, significantly extending the R&D cycle and greatly increasing development costs. Summary of the Invention

[0003] This application aims to at least partially address one of the technical problems in the related art.

[0004] Therefore, the first objective of this application is to propose an analysis method for the interference fit of the motor stator core, which can accurately evaluate the interference fit of the motor stator core during the design stage, effectively save experimental costs and shorten the R&D cycle, and at the same time achieve precise control over the interference fit range, providing a reliable guarantee for the stable and normal operation of the motor.

[0005] The second objective of this application is to provide an analysis device for the interference fit of an electric motor stator core.

[0006] The third objective of this application is to propose an electronic device.

[0007] The fourth objective of this application is to provide a computer-readable storage medium.

[0008] To achieve the above objectives, the first aspect of this application proposes a method for analyzing the interference fit of a motor stator core, comprising the following steps: performing finite element modeling of a vehicle motor assembly to obtain a motor assembly model, wherein the motor assembly model includes multiple part models, and the multiple part models include a stator core model; establishing a first constraint in the bolt engagement area of ​​the motor assembly model, and establishing a second constraint between each part model; defining the materials of the multiple part models respectively, and defining the boundaries of the motor assembly model to obtain a target motor assembly model; obtaining a preset stator core interference fit design strategy, and analyzing the target motor assembly model based on the preset stator core interference fit design strategy to obtain the analysis results of the multiple part models; and determining whether the core model meets the preset interference fit design conditions based on the analysis results.

[0009] According to the method for analyzing the interference fit of the motor stator core in this application, finite element modeling of the vehicle motor assembly is first performed to obtain a motor assembly model, which includes multiple part models, including a stator core model. Then, a first constraint is established in the bolt engagement area of ​​the motor assembly model, and a second constraint is established between each part model. Next, material definitions are performed for each of the multiple part models, and boundary definitions are performed for the motor assembly model to obtain a target motor assembly model. A preset stator core interference fit design strategy is then obtained, and the target motor assembly model is analyzed based on this strategy to obtain analysis results for the multiple part models. Finally, the analysis results are used to determine whether the core model meets the preset interference fit design conditions. Therefore, the interference fit of the motor stator core can be accurately evaluated during the design phase, effectively saving experimental costs and shortening the development cycle. Simultaneously, precise control over the interference fit range is achieved, providing a reliable guarantee for the stable and normal operation of the motor.

[0010] In addition, the method for analyzing the interference fit of the motor stator core according to the above embodiments of this application may also have the following additional technical features: In one embodiment of this application, finite element modeling of the vehicle motor assembly is performed to obtain a motor assembly model, including: constructing finite element models of multiple parts in the vehicle motor assembly, wherein the finite element models include a motor housing model, a stator core model, a bolt model, and a reducer housing model; assembling the models according to a preset assembly strategy and the finite element model corresponding to each part to obtain a motor assembly model.

[0011] In one embodiment of this application, the boundary definition of the motor assembly model includes: constraining the degrees of freedom of the reducer and motor suspension bracket mounting flange surface nodes in the motor assembly model to define the boundary of the motor assembly model.

[0012] In one embodiment of this application, the preset sub-core interference design strategy includes a minimum interference design strategy and a maximum interference design strategy. The analysis results include a first analysis result and a second analysis result. Specifically, the target motor assembly model is analyzed based on the preset sub-core interference design strategy to obtain analysis results for multiple component models, including: analyzing the target motor assembly model based on the minimum interference design strategy to obtain a first analysis result; and analyzing the target motor assembly model based on the maximum interference design strategy to obtain a second analysis result.

[0013] In one embodiment of this application, the minimum interference design strategy includes: applying a first preset bolt axial force load to the bolt model, applying a preset minimum interference load to the stator core model and the motor housing model, applying a first preset temperature load to the finite element model corresponding to each part, and applying a preset maximum output torque load to the target motor assembly model; the maximum interference design strategy includes: applying a second preset bolt axial force load to the bolt model, applying a preset maximum interference load to the stator core model and the motor housing model, applying a second preset temperature load to the finite element model corresponding to each part, applying a preset maximum output torque load to the target motor assembly model, and applying a preset gravity load to the target motor assembly model.

[0014] In one embodiment of this application, determining whether the core model meets the preset interference design conditions based on the analysis results includes: parsing the first analysis results to obtain the first target analysis results of the motor housing model and the stator core model, and calculating the first analysis data between the motor housing model and the stator core model based on the first target analysis results; parsing the second analysis results to obtain the second target analysis results of the motor housing model and the stator core model, and calculating the strength safety factor of the motor housing model based on the second target analysis results; and determining whether the core model meets the preset interference design conditions based on the first analysis data and the strength safety factor.

[0015] In one embodiment of this application, the preset interference design conditions include preset minimum interference design conditions and preset maximum interference design conditions. Determining whether the core model meets the preset interference design conditions based on first analysis data and a strength safety factor includes: determining the continuous area of ​​the contact pressure region, the maximum slippage of the contact surface, and the contact surface friction force between the stator core model and the motor housing model based on the first analysis data; if the continuous area of ​​the contact pressure region is greater than a preset contact area threshold, the maximum slippage of the contact surface is less than a preset slippage threshold, and the contact surface friction force is greater than a preset friction force threshold, then the core model is determined to meet the preset minimum interference design conditions; if the strength safety factor is greater than a preset strength safety factor threshold, then the core model is determined to meet the preset maximum interference design conditions.

[0016] To achieve the above objectives, a second aspect of this application proposes an analysis device for the interference fit of a motor stator core, comprising: a modeling module for performing finite element modeling of a vehicle motor assembly to obtain a motor assembly model, wherein the motor assembly model includes multiple part models, and the multiple part models include a stator core model; a constraint module for establishing a first constraint in the bolt engagement area of ​​the motor assembly model and establishing a second constraint between each part model; a definition module for defining the materials of the multiple part models and defining the boundaries of the motor assembly model to obtain a target motor assembly model; an analysis module for obtaining a preset stator core interference fit design strategy and analyzing the target motor assembly model based on the preset stator core interference fit design strategy to obtain analysis results for the multiple part models; and a determination module for determining whether the stator core model meets the preset interference fit design conditions based on the analysis results.

[0017] According to the embodiment of this application, the device for analyzing the interference fit of the motor stator core first performs finite element modeling of the vehicle motor assembly using a modeling module to obtain a motor assembly model. This model includes multiple component models, including a stator core model. Then, a constraint module establishes a first constraint in the bolt engagement area of ​​the motor assembly model and a second constraint between each component model. Next, a definition module defines the materials of the multiple component models and the boundaries of the motor assembly model to obtain a target motor assembly model. Then, an analysis module obtains a preset stator core interference fit design strategy and analyzes the target motor assembly model based on this strategy to obtain analysis results for the multiple component models. Finally, a determination module determines whether the stator core model meets the preset interference fit design conditions based on the analysis results. Therefore, the device can accurately evaluate the interference fit of the motor stator core during the design phase, effectively saving experimental costs and shortening the development cycle. It also achieves precise control over the range of the stator core interference fit, providing a reliable guarantee for the stable and normal operation of the motor.

[0018] To achieve the above objectives, a third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements any of the above-mentioned methods for analyzing the interference fit of the motor stator core.

[0019] The electronic device according to the embodiments of this application implements any of the above-mentioned methods for analyzing the interference fit of the motor stator core when the processor executes the computer program. This enables accurate evaluation of the interference fit of the motor stator core during the design phase, effectively saving test costs and shortening the R&D cycle. At the same time, it enables precise control over the interference fit range of the core, providing a reliable guarantee for the stable and normal operation of the motor.

[0020] To achieve the above objectives, a fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement any of the above-described methods for analyzing the interference fit of the motor stator core.

[0021] According to the embodiments of this application, a computer-readable storage medium storing a computer program thereon implements any of the above-mentioned methods for analyzing the interference fit of the motor stator core when executed by a processor. This enables accurate evaluation of the interference fit of the motor stator core during the design phase, effectively saving testing costs and shortening the R&D cycle. At the same time, it enables precise control over the interference fit range of the core, providing a reliable guarantee for the stable and normal operation of the motor.

[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart illustrating a method for analyzing the interference fit of a motor stator core according to some embodiments of this application; Figure 2 Finite element modeling of a vehicle motor assembly based on an analysis method for interference fit of motor stator core according to some embodiments of this application; Figure 3 Stress-strain curves of the housing material are shown in the analysis method for interference fit of motor stator core according to some embodiments of this application. Figure 4 Stress-strain curves of stator materials are provided for the analysis method of interference fit of motor stator core according to some embodiments of this application. Figure 5 This is a flowchart illustrating a method for analyzing the interference fit of a motor stator core according to a specific embodiment of this application. Figure 6 A block diagram of an analysis apparatus for the interference fit of a motor stator core according to some embodiments of this application; and Figure 7 This is a schematic diagram of the structure of an electronic device according to some embodiments of this application. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0025] The following description, with reference to the accompanying drawings, describes a method, apparatus, electronic device, and computer-readable storage medium for analyzing the interference fit of a motor stator core according to embodiments of this application.

[0026] The method for analyzing the interference fit of the motor stator core provided in this application embodiment can be executed by an electronic device, such as a mobile phone, tablet computer, handheld computer, or server, etc., without any limitation.

[0027] In this embodiment, the electronic device may include a processing component, a storage component, and a driving component. Optionally, the driving component and the processing component may be integrated, and the storage component may store an operating system, application programs, or other program modules. The processing component implements the motor stator core interference analysis method provided in this embodiment by executing the application programs stored in the storage component.

[0028] like Figure 1 As shown, the method for analyzing the interference fit of the motor stator core in this application embodiment may include the following steps: Step S1: Perform finite element modeling of the vehicle motor assembly to obtain the motor assembly model, which includes multiple part models, including the stator core model.

[0029] Specifically, based on drawings or user-input data, an original three-dimensional geometric model of the vehicle motor assembly is constructed. To ensure the efficiency and accuracy of subsequent finite element analysis, the original three-dimensional geometric model can be geometrically cleaned and simplified. For example, manufacturable features that have minimal impact on the overall structural stiffness and load transfer path, such as small chamfers, markings, and non-load-bearing bosses, can be removed. However, key geometric areas used to define assembly relationships, bear loads, and apply constraints must be fully retained, such as mating surfaces of various components, bolt connection surfaces, and suspension mounting surfaces, to ensure that the mechanical model can accurately reflect the actual structural state.

[0030] The processed model is imported into the preprocessing module of finite element analysis software (such as Abaqus, ANSYS, etc.) for mesh generation. Considering the complex structure of the motor assembly, which includes regular components such as the stator core and irregular components such as the housing with heat dissipation fins, a regional and precision-based meshing strategy can be adopted. For core load-bearing and force-transmitting components such as the stator core, due to its relatively regular structure, hexahedral elements with high computational accuracy and good numerical stability are preferred for fine meshing. Especially in stress concentration areas such as the outer cylindrical surface of the stator core (the interference fit surface with the housing) and the tooth groove, it is necessary to strictly ensure that the mesh is uniform and regular. For large components with complex shapes such as the motor housing, tetrahedral elements with greater adaptability can be used to fill non-critical areas.

[0031] After mesh generation, a comprehensive mesh quality check can be conducted. By evaluating core indicators such as element distortion rate and aspect ratio, unqualified elements are promptly removed or optimized. Finally, based on the original assembly relationships, the mesh models of each component are combined to form a final assembly. Figure 2 The complete finite element model of the motor assembly shown can be used for subsequent simulation analysis.

[0032] Step S2: Establish a first constraint in the bolt engagement area of ​​the motor assembly model, and establish a second constraint between each part model.

[0033] Specifically, to accurately simulate the real mechanical interactions between components in the motor assembly, the connection constraints of each component need to be precisely defined in the finite element model. For the screw-in connection area between the bolt and the threaded hole, a first constraint is established. This constraint can be defined as "bound" or "fixed," used to completely fix the two contact surfaces of the bolt and the threaded hole, simulating the rigid connection state after bolt pre-tightening. For the interference fit surface between the outer surface of the stator core and the inner surface of the motor housing, and other assembly surfaces that may experience relative displacement, a second constraint is established. This constraint can be defined as "face-to-face contact" or "contact pair." Simultaneously, the contact properties of the second constraint need to be precisely defined. For example, the normal behavior can be set to "hard contact" to ensure that the contact surface transmits force under compression and separates under tension. The tangential behavior can be defined as Coulomb friction based on the contact surface material. Static and dynamic friction coefficients need to be set to simulate the contact surface's ability to resist sliding. After the contact constraints are defined, convergence control settings are required, such as adjusting the normal contact stiffness and selecting a reasonable contact algorithm, to ensure computational stability and reliable results during complex interference and separation processes.

[0034] Step S3: Define the materials for multiple part models and define the boundaries for the motor assembly model to obtain the target motor assembly model.

[0035] Specifically, to endow the finite element model with realistic physical properties, a corresponding material model and its related parameters need to be specified for each part model. Based on the actual materials selected for each component, its basic mechanical property parameters, such as elastic modulus, Poisson's ratio, and coefficient of thermal expansion, are defined in the material library of the finite element analysis software. For components that may undergo plastic deformation under extreme conditions, their plastic constitutive models need to be further defined, inputting stress-strain curves obtained through uniaxial tensile tests, such as... Figure 3 The stress-strain curves of the shell material shown are as follows: Figure 4 The stress-strain curves of the stator material are shown to achieve accurate simulation analysis of the elastoplastic nonlinear behavior of the component.

[0036] After assigning material properties, boundary constraints need to be defined for the motor assembly model to accurately simulate the actual fixed state of the motor assembly during vehicle installation or bench testing. Boundary conditions should be defined based on the required accuracy and simplification of the simulated installation state. For example, the reducer mounting flange surface and the motor suspension bracket mounting mating surface can be selected as constraint areas. Full-degree-of-freedom constraints (i.e., fixing all translational and rotational degrees of freedom) should be applied to all nodes on these surfaces to eliminate overall rigid body displacement of the model. This ensures that subsequent applied interference forces, torques, temperatures, and other loads can be effectively transmitted through the structure and achieve load balance within the constraint areas.

[0037] Step S4: Obtain the preset sub-core interference design strategy, and analyze the target motor assembly model based on the preset sub-core interference design strategy to obtain the analysis results of multiple component models. The preset sub-core interference design strategy can be calibrated according to actual conditions.

[0038] Specifically, a pre-defined stator core interference fit design strategy is a multi-physics coupled load condition sequence used to systematically verify the reliability of the interference fit between the stator core and the motor housing. The core of this strategy is to sequentially simulate the complete load history from the assembly process to extreme operating conditions, examining the performance and strength of the interference fit under adverse conditions. This strategy may include multiple analysis sub-items targeting different design objectives. For example, it may include a first-type analysis strategy aimed at verifying whether the minimum interference fit is sufficient to prevent loosening failure of the mating surfaces, and a second-type analysis strategy aimed at verifying whether the maximum interference fit will cause strength or fatigue failure of structural components such as the motor housing.

[0039] When applying this strategy, the specific values ​​or load spectra of each load in the strategy can be determined first based on the design goals, performance requirements, and typical operating conditions of the motor product. Then, on the target motor assembly model, loads are applied step by step through the load module of the finite element analysis software according to the load application sequence and combination method specified by the strategy, reflecting the cumulative effect of the loads. After completing the load step settings, the model is submitted for nonlinear statics or thermo-mechanical coupling solution. The solver will calculate the equilibrium state of the model under each load increment based on geometry, mesh, material, contact, and boundary conditions, and finally output the complete mechanical response results. The above results can be stored in a database, including but not limited to the stress distribution, strain field, and displacement field of each part model, as well as key physical quantities such as the contact pressure, contact state, and relative slip of the stator core and shell mating surfaces, providing a quantitative basis for subsequent interference fit design.

[0040] Step S5: Determine whether the core model meets the preset interference design conditions based on the analysis results. The preset interference design conditions can be calibrated according to actual conditions.

[0041] Specifically, the preset interference fit design conditions are a set of quantitative criteria and acceptance standards related to the reliability and structural safety of the interference fit between the stator core and the motor housing. The specific thresholds for each condition can be adaptively calibrated according to the design requirements, industry standards, and safety margin standards of the motor product. For the different preset stator core interference fit design strategies, the corresponding analysis results are processed using tools to extract information and calculate indicators, and then compared with the preset thresholds one by one for verification. For example, for the analysis strategy to verify the minimum interference fit, the judgment can be made from the perspective of contact mechanics. First, the contact pressure distribution data of the mating surface between the stator core and the motor housing is extracted from the analysis results. The area of ​​the effective continuous contact region with contact pressure greater than zero on the mating surface is calculated, and then the proportion of this area to the theoretical total contact area of ​​the mating surface is obtained. This proportion is then compared with the preset minimum continuous contact area proportion threshold. Simultaneously, the maximum relative tangential slip on the mating surface between the stator core and the motor housing is extracted from the simulation results of the entire loading process and compared with the preset maximum allowable slip threshold. In addition, based on the contact pressure distribution data of the mating surfaces, the maximum static friction force that the mating surfaces can provide under the current interference is calculated, and it is compared with the minimum required friction force for equivalent extreme working conditions (such as dynamic impact loads) to verify whether the mating surfaces meet the requirements for anti-separation and anti-slip capabilities.

[0042] The calculated values ​​of the above indicators are compared with the corresponding preset thresholds (such as the minimum continuous contact area ratio, the maximum allowable slippage, and the minimum required friction force). If the analysis results of all preset analysis strategies, such as the continuous area of ​​the contact pressure region and the friction force of the contact surface, meet their respective preset threshold conditions, it can be determined that the stator core model meets the preset interference design conditions under the current interference design scheme, and the design scheme is reliable and feasible. If any indicator fails to reach the corresponding threshold, it indicates that the current interference design scheme has risks. It is necessary to return to the design stage and optimize the interference value or related structural design according to the specific unmet criterion type.

[0043] This embodiment first performs finite element modeling of the vehicle motor assembly to obtain a motor assembly model, which includes multiple component models, including a stator core model. Then, a first constraint is established in the bolt engagement area of ​​the motor assembly model, and a second constraint is established between each component model. Next, material definitions are performed for each component model, and boundary definitions are performed for the motor assembly model to obtain a target motor assembly model. A preset stator core interference fit design strategy is then obtained, and the target motor assembly model is analyzed based on this strategy to obtain analysis results for multiple component models. Finally, the analysis results are used to determine whether the core model meets the preset interference fit design conditions. Therefore, the stator core interference fit can be accurately evaluated during the design phase, effectively saving testing costs and shortening the development cycle. Simultaneously, it achieves precise control over the stator core interference fit range, providing a reliable guarantee for the stable and normal operation of the motor.

[0044] In some embodiments of this application, finite element modeling of the vehicle motor assembly is performed to obtain a motor assembly model, including: constructing finite element models of multiple parts in the vehicle motor assembly, wherein the finite element models include a motor housing model, a stator core model, a bolt model, and a reducer housing model; assembling the models according to a preset assembly strategy and the corresponding finite element model of each part to obtain the motor assembly model. The preset assembly strategy can be calibrated according to actual conditions.

[0045] Specifically, finite element modeling is first performed on the core load-bearing and connecting components of the motor assembly, such as... Figure 2 As shown, this embodiment may include, but is not limited to, the following four models: Motor housing model 1, whose structure is usually complex, including features such as cooling water channels, mounting supports, and reinforcing ribs. When meshing, the mesh must be coordinated and have the same accuracy for the mating surfaces with the stator core. For non-critical areas, tetrahedral elements with higher computational efficiency can be used. For thin-walled or stress-concentrated areas, local mesh refinement may be necessary. Stator core model 2, as the direct bearer of electromagnetic torque and the core component of the interference fit, requires the highest model accuracy. A hexahedral dominant mesh strategy with excellent computational accuracy is usually adopted to ensure the mesh quality of its outer cylindrical mating surfaces and geometrically abrupt regions such as tooth grooves. Bolt model 3, used to simulate the physical bolts that fasten the motor housing and reducer housing together. Under the premise of ensuring computational efficiency, various methods such as beam elements, solid elements, or simplified coupling constraints can be used for modeling, but it is necessary to accurately apply and transmit bolt preload. Reducer housing model 4, whose meshing principle is similar to that of the motor housing, needs to ensure that the mesh of its connection flange surface with the motor housing is good to accurately simulate the bolt connection.

[0046] A pre-defined assembly strategy is a set of systematic rules and instructions pre-defined for constructing a finite element assembly model. It requires that the relative positions and fit relationships between the component models be consistent with the 3D design drawings. For example, the stator core model 2 should be precisely located at the center of the internal cavity of the motor housing model 1, and the gap reserved between its outer surface and the inner surface of the housing (i.e., the initial geometric gap used to define the interference fit) should be precisely set. Each bolt model 3 needs to pass through the corresponding bolt holes of the motor housing 1 and the reducer housing 4, and the correct preload load simulation should be applied. The pre-defined assembly strategy can be calibrated according to actual conditions. For example, for motor assemblies with multiple suspension mounting points or special connection structures, the assembly strategy needs to be adjusted accordingly to ensure that the model accurately reflects all critical structural connections and load transfer interfaces. Through this model assembly based on actual assembly relationships, the final model is formed as follows: Figure 2 The finite element model of the motor assembly shown can accurately reflect the interaction between components and the load transmission path, providing an accurate geometric and topological basis for subsequent multiphysics coupling analysis.

[0047] In some embodiments of this application, the boundary definition of the motor assembly model includes: constraining the degrees of freedom of the reducer and motor suspension bracket mounting flange surface nodes in the motor assembly model to define the boundary of the motor assembly model.

[0048] Specifically, depending on the actual installation method of the motor assembly on the vehicle or test bench, the mounting flange surface of the reducer housing and the mounting interface of the motor body's suspension bracket can be selected as the constraint application area. These surfaces are the physical interfaces through which the motor assembly mechanically connects with the external environment (transmission system, chassis) and transmits loads, accurately reflecting the mechanical boundaries of the system. In the finite element model, this means selecting all mesh nodes located on these specified geometric surfaces. Applying full-degree-of-freedom constraints (i.e., fixing all translational and rotational degrees of freedom) to all nodes on these surface areas eliminates overall rigid body displacement of the model, ensuring that subsequently applied interference forces, torques, temperatures, and other loads can be effectively transmitted through the structure and achieve load balance within the constrained area.

[0049] In some embodiments of this application, the preset sub-core interference design strategy includes a minimum interference design strategy and a maximum interference design strategy. The analysis results include a first analysis result and a second analysis result. Specifically, the target motor assembly model is analyzed based on the preset sub-core interference design strategy to obtain analysis results for multiple component models, including: analyzing the target motor assembly model based on the minimum interference design strategy to obtain a first analysis result; and analyzing the target motor assembly model based on the maximum interference design strategy to obtain a second analysis result.

[0050] Specifically, the pre-defined stator core interference design strategy can include a minimum interference design strategy and a maximum interference design strategy. The minimum interference design strategy verifies whether the selected minimum interference under the most unfavorable operating conditions can still ensure that no functional failure (such as loosening or excessive slippage) occurs between the stator core and the motor housing. The simulation results obtained by implementing this strategy are called the first analysis results, and their core focus is on the mechanical behavior of the contact surface, such as contact pressure distribution, contact state, and relative slippage. The maximum interference design strategy verifies whether the selected maximum interference under the combination of maximum assembly stress and extreme environmental loads will lead to strength failure or plastic failure of the motor assembly structural components (especially the motor housing). The simulation results obtained by implementing this strategy are called the second analysis results, and their core focus is on the stress level, strain distribution, and safety factor of the structural components.

[0051] In some embodiments of this application, the minimum interference design strategy includes: applying a first preset bolt axial force load to the bolt model, applying a preset minimum interference load to the stator core model and the motor housing model, applying a first preset temperature load to the finite element model corresponding to each part, and applying a preset maximum output torque load to the target motor assembly model; the maximum interference design strategy includes: applying a second preset bolt axial force load to the bolt model, applying a preset maximum interference load to the stator core model and the motor housing model, applying a second preset temperature load to the finite element model corresponding to each part, applying a preset maximum output torque load to the target motor assembly model, and applying a preset gravity load to the target motor assembly model. The first preset bolt axial force load, the preset minimum interference load, the first preset temperature load, the preset maximum output torque load, the second preset bolt axial force load, the preset maximum interference load, the second preset temperature load, and the preset gravity load can be calibrated according to actual conditions.

[0052] Specifically, the minimum interference fit design strategy may include: First, applying a first preset bolt axial force load, which simulates the bolt tightening process on an assembly line. This preload causes the motor housing to shrink and deform, preemptively weakening the tightness of the interference fit. Then, on the model with the existing bolt preload deformation, applying a preset minimum interference load equal to the lower limit of the design tolerance, to simulate the assembly process of the stator core being pressed into the housing, establishing initial contact pressure. Next, applying a first preset temperature load, typically the highest operating temperature. Finally, applying a preset maximum output torque load to simulate the motor's peak output torque condition.

[0053] The maximum interference design strategy may include: First, applying a second preset bolt axial force load, which also simulates the bolt tightening process on the assembly line. Next, applying a preset maximum interference load, which is the maximum interference at the upper limit of the design tolerance, to simulate the maximum initial assembly stress generated in the contact area during assembly. Then, applying a second preset temperature load, typically the lowest operating temperature (e.g., -40°C). Following this, applying a preset maximum output torque load; the peak torque load will induce a complex stress distribution on the housing, potentially superimposed with assembly stress and thermal stress. Finally, applying a preset gravity load, which represents the long-term static stress generated by the motor's own weight.

[0054] By applying loads in a strategic and sequential manner, the finite element model can simulate the limit states of easy loosening and easy failure, thus making the judgments based on the first and second analysis results have engineering conservatism and reliability. The specific values ​​of each preset load (such as axial force, interference fit, temperature value, and torque value) need to be calibrated according to the specific design parameters and operating conditions of the target motor.

[0055] In some embodiments of this application, determining whether the core model meets the preset interference design conditions based on the analysis results includes: parsing the first analysis results to obtain the first target analysis results of the motor housing model and the stator core model, and calculating the first analysis data between the motor housing model and the stator core model based on the first target analysis results; parsing the second analysis results to obtain the second target analysis results of the motor housing model and the stator core model, and calculating the strength safety factor of the motor housing model based on the second target analysis results; and determining whether the core model meets the preset interference design conditions based on the first analysis data and the strength safety factor.

[0056] Specifically, the first analysis results are analyzed to extract data directly related to the interference fit surface between the stator core and the motor housing. These first target analysis results may include the contact pressure values, contact states (closed / open), and relative slip history of all nodes on the contact surface. Based on this data, post-processing calculations yield the first analysis data for evaluating anti-loosening performance, the core of which is the quantified contact pressure distribution characteristics, maximum slip, and available static friction force. The second analysis results are analyzed to extract the stress and strain field data of the entire motor housing as the second target analysis results. This stress and strain result (usually including multiaxial stress state, stress concentration factor, etc.) and the fatigue characteristic parameters of the housing material (such as SN curve) are input into professional fatigue analysis software (such as FEMFAT, nCode, etc.), and calculated using algorithms such as stress life method or strain life method, finally outputting a global or local strength safety factor. This factor reflects the safety margin of the housing structure against fatigue failure or plastic yielding at the most dangerous point under the current maximum interference and ultimate load. After completing the above analysis and calculation, the obtained first analysis data and strength safety factor are compared with the preset qualification standard, and the reliability of the current interference fit design scheme can be finally determined.

[0057] In some embodiments of this application, the preset interference design conditions include preset minimum interference design conditions and preset maximum interference design conditions. Determining whether the stator core model meets the preset interference design conditions based on first analysis data and a strength safety factor includes: determining the continuous area of ​​the contact pressure region, the maximum slippage of the contact surface, and the contact surface friction force between the stator core model and the motor housing model based on the first analysis data; if the continuous area of ​​the contact pressure region is greater than a preset contact area threshold, the maximum slippage of the contact surface is less than a preset slippage threshold, and the contact surface friction force is greater than a preset friction force threshold, then the stator core model is determined to meet the preset minimum interference design conditions; if the strength safety factor is greater than a preset strength safety factor threshold, then the stator core model is determined to meet the preset maximum interference design conditions.

[0058] Specifically, verifying whether the preset interference fit design conditions are met may include the following steps: Verifying the continuous area of ​​the contact pressure region: From the first analysis data, identify the node regions where the contact pressure is greater than zero and spatially connected, calculate the total area of ​​these regions, compare this area with the theoretical total contact area to obtain the continuous contact area ratio, and determine whether it is greater than a preset contact area threshold (e.g., 10%). This ensures that the mating surfaces have a sufficiently large and continuous tight contact area, avoiding stress concentration and poor heat dissipation caused by localized contact. Verifying the maximum slip of the contact surface: From the entire loading process, extract the maximum relative tangential displacement value between all nodes of the contact surface between the stator core and the motor housing, i.e., the maximum slip of the contact surface, and determine whether it is less than a preset slip threshold (e.g., 0.01 mm), thereby controlling fretting wear within an acceptable range. Verifying the contact surface friction: Calculate the maximum static friction force F that the contact surface can provide based on the contact pressure distribution. f The calculation formula is as follows:

[0059] Among them, F f ρ is the frictional force between the motor housing and the stator core, in N; Cpress is the contact pressure at each node on the main surface of the contact surface between the motor housing and the stator core, in MPa; n is the total number of nodes on the main surface of the contact surface between the motor housing and the stator core; S is the contact area between the motor housing and the stator core, in mm. 2 ; It is the coefficient of friction between the motor housing and the stator core.

[0060] At the same time, based on design requirements (such as resisting a 50G impact), the preset friction threshold is calculated, and the judgment formula is as follows:

[0061] in, This is the conversion factor between dynamic and static loads; The value is the mass of the stator assembly, in kg; g is the acceleration due to gravity, in N / kg.

[0062] The system determines whether the frictional force at the contact surface exceeds a preset frictional force threshold, thus ensuring that the interference fit has sufficient resistance to macroscopic slippage. If all three conditions are met simultaneously, the stator core model in the current design is deemed to satisfy the preset minimum interference design condition.

[0063] As a specific embodiment of this application, such as Figure 5 As shown, the analysis method for the interference fit of the motor stator core may include the following steps: S101, construct finite element models of multiple parts in the vehicle motor assembly, including the motor housing model, stator core model, bolt model, and reducer housing model. Specifically, the stator core is modeled using a 1mm hexahedral mesh with fine detail, ensuring that the mesh size of the motor housing area that has an interference fit with it is similar and the shape is uniform and regular. Except for the mating surface with the stator core, the motor housing is modeled using a 2mm tetrahedral mesh.

[0064] S102, assemble the model according to the preset assembly strategy and the finite element model corresponding to each part to obtain the motor assembly model.

[0065] Specifically, based on the actual assembly relationship of the motor, the models of each component are positioned and combined in the software to form a structure like... Figure 2 The complete finite element model of the motor assembly is shown.

[0066] S103, establish a first constraint in the bolt engagement area of ​​the motor assembly model, and establish a second constraint between each part model.

[0067] Specifically, a TIE fit is established in the bolt engagement area, and a CONTACT PAIR fit is established between other parts.

[0068] S104 defines the materials for multiple part models.

[0069] Specifically, the elastic modulus E, Poisson's ratio μ, coefficient of thermal expansion α, and stress-strain curves of the materials in the finite element model of each component are defined. Typically, for steel, E = 210000 MPa, μ = 0.30, and coefficient of thermal expansion α = 11.0e⁻⁶; for aluminum alloy, E = 70000 MPa, μ = 0.33, and coefficient of thermal expansion α = 23.0e⁻⁶. The stress-strain curves of the shell material are shown below. Figure 3 As shown, the stress-strain curve of the stator material is as follows: Figure 4 As shown.

[0070] S105, define the boundaries of the motor assembly model to obtain the target motor assembly model.

[0071] Specifically, the mounting flange surface of the reducer housing and the mounting mating surfaces of the two motor suspension brackets are selected to constrain the degrees of freedom of the nodes.

[0072] S106, Obtain the preset sub-core interference design strategy, and analyze the target motor assembly model based on the strategy.

[0073] Specifically, a minimum interference design strategy is implemented, applying a bolt axial force load of 20000N, a minimum interference load of 0.1mm between the stator core and the motor housing, a maximum temperature load of 120℃ for the stator core and 80℃ for other parts, and a maximum output torque load of 100Nm. The model with these load steps set is submitted to the ABAQUS / Standard solver for nonlinear statics, yielding the first analysis result including information on stress, strain, contact pressure, and slip. A maximum interference design strategy is then implemented, applying a bolt axial force load of 20000N, a minimum interference load of 0.3mm between the stator core and the motor housing, a minimum temperature load of -35℃ for all parts, a maximum output torque load of 100Nm, and a load equal to one times the gravity load. The solution is submitted again to obtain the second analysis result, primarily focusing on the structural stresses.

[0074] S107. Based on the analysis results, determine whether the core model meets the preset interference design conditions.

[0075] Specifically, the first analysis results were analyzed and calculated. By reading the contact pressure values ​​at the nodes in the contact pressure area between the core and the shell and combining them with the contact pressure distribution, it was found that the continuous area accounts for 65% of the total contact area, which is greater than 10%, meeting the requirements. The maximum slippage of the contact surface between the core and the shell was 0.007mm, which is less than 0.01mm, meeting the requirements. The frictional force of the contact surface between the core and the shell was calculated using the formula as 9.1e4N, which is greater than the static force of 3.5e4N converted from a 50G impact load according to the load conversion formula, meeting the requirements. Based on the above three judgment conditions, the current minimum interference of 0.1mm meets the design requirements. The second analysis results were analyzed and calculated. Using Femfat software, the static strength safety factor of the motor shell was calculated to be 1.8, which is greater than the limit of 1.5. The current maximum interference of 0.3mm meets the design requirements. In summary, the core model meets the preset interference design conditions.

[0076] In summary, the method for analyzing the interference fit of the motor stator core according to the embodiments of this application firstly involves finite element modeling of the vehicle motor assembly to obtain a motor assembly model. This model includes multiple component models, including a stator core model. Then, a first constraint is established in the bolt engagement area of ​​the motor assembly model, and a second constraint is established between each component model. Next, material definitions are performed for each component model, and boundary definitions are defined for the motor assembly model to obtain a target motor assembly model. A preset stator core interference fit design strategy is then obtained, and the target motor assembly model is analyzed based on this strategy to obtain analysis results for the multiple component models. Finally, the analysis results are used to determine whether the core model meets the preset interference fit design conditions. Therefore, the interference fit of the motor stator core can be accurately evaluated during the design phase, effectively saving experimental costs and shortening the development cycle. Simultaneously, precise control over the interference fit range is achieved, providing a reliable guarantee for the stable and normal operation of the motor.

[0077] Corresponding to the above embodiments, this application also proposes an analysis device for the interference fit of the motor stator core.

[0078] like Figure 6 As shown, the motor stator core interference analysis device 600 of this application embodiment includes: a modeling module 610, a constraint module 620, a definition module 630, an analysis module 640, and a determination module 650.

[0079] The system includes the following modules: Modeling module 610, which performs finite element modeling of the vehicle motor assembly to obtain a motor assembly model, which includes multiple part models, including a stator core model; Constraint module 620, which establishes a first constraint in the bolt engagement area of ​​the motor assembly model and a second constraint between each part model; Definition module 630, which defines the materials of the multiple part models and defines the boundaries of the motor assembly model to obtain a target motor assembly model; Analysis module 640, which obtains a preset stator core interference design strategy and analyzes the target motor assembly model based on the preset stator core interference design strategy to obtain the analysis results of the multiple part models; and Determination module 650, which determines whether the stator core model meets the preset interference design conditions based on the analysis results.

[0080] According to one embodiment of this application, the modeling module 610 is further configured to: construct finite element models of multiple parts in the vehicle motor assembly, wherein the finite element models include a motor housing model, a stator core model, a bolt model, and a reducer housing model; and assemble the models according to a preset assembly strategy and the finite element model corresponding to each part to obtain a motor assembly model.

[0081] According to one embodiment of this application, the definition module 630 is further configured to: constrain the degrees of freedom of the reducer and motor suspension bracket mounting flange surface nodes in the motor assembly model, so as to define the boundary of the motor assembly model.

[0082] According to one embodiment of this application, the analysis module 640 is further configured to: analyze the target motor assembly model based on the minimum interference design strategy to obtain a first analysis result; and analyze the target motor assembly model based on the maximum interference design strategy to obtain a second analysis result.

[0083] According to one embodiment of this application, the minimum interference design strategy includes: applying a first preset bolt axial force load to the bolt model, applying a preset minimum interference load to the stator core model and the motor housing model, applying a first preset temperature load to the finite element model corresponding to each part, and applying a preset maximum output torque load to the target motor assembly model; the maximum interference design strategy includes: applying a second preset bolt axial force load to the bolt model, applying a preset maximum interference load to the stator core model and the motor housing model, applying a second preset temperature load to the finite element model corresponding to each part, applying a preset maximum output torque load to the target motor assembly model, and applying a preset gravity load to the target motor assembly model.

[0084] According to one embodiment of this application, the determining module 650 is further configured to: analyze the first analysis result to obtain the first target analysis result of the motor housing model and the stator core model, and calculate the first analysis data between the motor housing model and the stator core model based on the first target analysis result; analyze the second analysis result to obtain the second target analysis result of the motor housing model and the stator core model, and calculate the strength safety factor of the motor housing model based on the second target analysis result; and determine whether the core model meets the preset interference design conditions based on the first analysis data and the strength safety factor.

[0085] According to one embodiment of this application, the determining module 650 is further configured to: determine the continuous area of ​​the contact pressure region, the maximum slippage of the contact surface, and the contact surface friction force between the stator core model and the motor housing model based on the first analysis data; if the continuous area of ​​the contact pressure region is greater than a preset contact area threshold, the maximum slippage of the contact surface is less than a preset slippage threshold, and the contact surface friction force is greater than a preset friction force threshold, then the core model is determined to meet the preset minimum interference design condition; if the strength safety factor is greater than a preset strength safety factor threshold, then the core model is determined to meet the preset maximum interference design condition.

[0086] It should be noted that the above-described embodiments and explanations of the beneficial effects of the method for analyzing the interference fit of the motor stator core also apply to the analysis device for the interference fit of the motor stator core in the embodiments of this application. To avoid redundancy, they will not be elaborated in detail here.

[0087] In summary, the stator core interference analysis device according to the embodiments of this application first performs finite element modeling of the vehicle motor assembly through a modeling module to obtain a motor assembly model. This model includes multiple component models, including a stator core model. Then, a constraint module establishes a first constraint in the bolt engagement area of ​​the motor assembly model and a second constraint between each component model. Next, a definition module defines the materials of the multiple component models and the boundaries of the motor assembly model to obtain a target motor assembly model. Then, an analysis module obtains a preset stator core interference design strategy and analyzes the target motor assembly model based on this strategy to obtain analysis results for the multiple component models. Finally, a determination module determines whether the core model meets the preset interference design conditions based on the analysis results. Therefore, the stator core interference can be accurately evaluated during the design phase, effectively saving experimental costs and shortening the development cycle. Simultaneously, it achieves precise control over the core interference range, providing a reliable guarantee for the stable and normal operation of the motor.

[0088] Corresponding to the above embodiments, this application also proposes an electronic device.

[0089] like Figure 7 As shown, the electronic device 700 of this application embodiment includes a memory 710, a processor 720, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement any of the above-mentioned methods for analyzing the interference fit of the motor stator core.

[0090] The electronic device according to the embodiments of this application implements any of the above-mentioned methods for analyzing the interference fit of the motor stator core when the processor executes the computer program. This enables accurate evaluation of the interference fit of the motor stator core during the design phase, effectively saving test costs and shortening the R&D cycle. At the same time, it enables precise control over the interference fit range of the core, providing a reliable guarantee for the stable and normal operation of the motor.

[0091] Corresponding to the above embodiments, this application also proposes a computer-readable storage medium.

[0092] The computer-readable storage medium of this application embodiment stores a computer program that is executed by a processor to implement any of the above-described methods for analyzing the interference fit of the motor stator core.

[0093] According to the embodiments of this application, a computer-readable storage medium storing a computer program thereon implements any of the above-mentioned methods for analyzing the interference fit of the motor stator core when executed by a processor. This enables accurate evaluation of the interference fit of the motor stator core during the design phase, effectively saving testing costs and shortening the R&D cycle. At the same time, it enables precise control over the interference fit range of the core, providing a reliable guarantee for the stable and normal operation of the motor.

[0094] Specifically, in the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0095] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0096] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method for analyzing the interference fit of a motor stator core, characterized in that, include: Finite element modeling of the vehicle motor assembly is performed to obtain a motor assembly model, wherein the motor assembly model includes multiple part models, and the multiple part models include a stator core model; A first constraint is established in the bolt engagement area of ​​the motor assembly model, and a second constraint is established between each of the part models; Material definitions are performed on multiple part models, and boundary definitions are performed on the motor assembly model to obtain the target motor assembly model; A preset sub-core interference design strategy is obtained, and the target motor assembly model is analyzed based on the preset sub-core interference design strategy to obtain the analysis results of the multiple component models. Based on the analysis results, determine whether the core model meets the preset interference design conditions.

2. The method for analyzing the interference fit of the motor stator core according to claim 1, characterized in that, The finite element modeling of the vehicle motor assembly to obtain the motor assembly model includes: Finite element models of multiple parts in the vehicle motor assembly are constructed respectively, wherein the finite element models include motor housing model, stator core model, bolt model and reducer housing model; The model is assembled according to the preset assembly strategy and the finite element model corresponding to each part to obtain the motor assembly model.

3. The method for analyzing the interference fit of the motor stator core according to claim 1, characterized in that, The boundary definition of the motor assembly model includes: The degrees of freedom of the reducer and motor mounting bracket mounting flange surface nodes in the motor assembly model are constrained to define the boundary of the motor assembly model.

4. The method for analyzing the interference fit of the motor stator core according to claim 2, characterized in that, The preset sub-core interference design strategy includes a minimum interference design strategy and a maximum interference design strategy. The analysis results include a first analysis result and a second analysis result. The analysis of the target motor assembly model based on the preset sub-core interference design strategy to obtain the analysis results of the multiple component models includes: The target motor assembly model is analyzed based on the minimum interference design strategy to obtain the first analysis result; The target motor assembly model is analyzed based on the maximum interference design strategy to obtain the second analysis result.

5. The method for analyzing the interference fit of the motor stator core according to claim 4, characterized in that, The minimum interference design strategy includes: applying a first preset bolt axial force load to the bolt model, applying a preset minimum interference load to the stator core model and the motor housing model, applying a first preset temperature load to the finite element model corresponding to each part, and applying a preset maximum output torque load to the target motor assembly model. The maximum interference design strategy includes: applying a second preset bolt axial force load to the bolt model, applying a preset maximum interference load to the stator core model and the motor housing model, applying a second preset temperature load to the finite element model corresponding to each part, applying the preset maximum output torque load to the target motor assembly model, and applying a preset gravity load to the target motor assembly model.

6. The method for analyzing the interference fit of the motor stator core according to claim 4, characterized in that, The step of determining whether the core model meets the preset interference design conditions based on the analysis results includes: The first analysis result is parsed to obtain the first target analysis result of the motor housing model and the stator core model, and the first analysis data between the motor housing model and the stator core model is calculated based on the first target analysis result. The second analysis result is analyzed to obtain the second target analysis result of the motor housing model and the stator core model, and the strength safety factor of the motor housing model is calculated based on the second target analysis result. Based on the first analysis data and the strength safety factor, determine whether the core model meets the preset interference design conditions.

7. The method for analyzing the interference fit of the motor stator core according to claim 6, characterized in that, The preset interference design conditions include preset minimum interference design conditions and preset maximum interference design conditions, wherein determining whether the core model meets the preset interference design conditions based on the first analysis data and the strength safety factor includes: Based on the first analysis data, the continuous area of ​​the contact pressure region, the maximum slippage of the contact surface, and the contact surface friction force between the stator core model and the motor housing model are determined. If the continuous area of ​​the contact pressure region is greater than the preset contact area threshold, the maximum slip of the contact surface is less than the preset slip threshold, and the friction of the contact surface is greater than the preset friction threshold, then the core model is determined to meet the preset minimum interference design condition. If the strength safety factor is greater than the preset strength safety factor threshold, then the core model is determined to meet the preset maximum interference design condition.

8. A device for analyzing the interference fit of a motor stator core, characterized in that, include: The modeling module is used to perform finite element modeling of the vehicle motor assembly to obtain a motor assembly model, wherein the motor assembly model includes multiple part models, and the multiple part models include a stator core model. A constraint module is used to establish a first constraint in the bolt engagement area of ​​the motor assembly model and a second constraint between each of the part models; The definition module is used to define the materials of multiple part models and define the boundaries of the motor assembly model to obtain the target motor assembly model. The analysis module is used to obtain a preset sub-core interference design strategy and analyze the target motor assembly model based on the preset sub-core interference design strategy to obtain the analysis results of the multiple part models. The determination module is used to determine whether the core model meets the preset interference design conditions based on the analysis results.

9. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the method for analyzing the interference fit of the motor stator core as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the method for analyzing the interference fit of the motor stator core as described in any one of claims 1-7.

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