Method and device for analyzing strength of motor shell

Abstract

The invention discloses a motor shell strength analysis method and device, and relates to the technical field of motors. The method comprises the following steps: respectively establishing a heat transfer simulation finite element model and a force field simulation finite element model of the motor shell in simulation software based on a three-dimensional model of the motor shell, and respectively carrying out material attribute assignment on the heat transfer simulation finite element model and the force field simulation finite element model; performing heat transfer simulation on the heat transfer simulation finite element model to obtain temperature distribution data of the motor shell, converting the format of the temperature distribution data into a format which can be identified by mechanical simulation, and loading the temperature distribution data and existing mechanical force load data to the force field simulation finite element model to perform force field simulation to obtain the motor shell. The strength analysis result of the motor shell is obtained, simulation analysis of the strength reliability of the motor shell is achieved, the influence of the temperature is considered during force field simulation, and the reliability of the strength analysis result of the motor shell is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric motors, and in particular to a method and a device for analyzing the strength of a motor housing. Background Art

[0002] The motor housing is used to protect the core components such as the stator winding and rotor core inside the motor so that these core components can always maintain normal working conditions. The strength reliability of the motor housing has an important impact on the protection of the motor housing. During the design stage of the motor, the strength reliability of the motor housing needs to be analyzed to provide reference and optimization guidance for the motor design. Summary of the invention

[0003] The present invention solves the technical problem of how to analyze the strength reliability of a motor housing by providing a motor housing strength analysis method and a motor housing strength analysis device.

[0004] On the one hand, the present invention provides the following technical solutions:

[0005] A motor housing strength analysis method, comprising:

[0006] Acquire a three-dimensional model of the motor housing, and establish a first finite element model for heat transfer simulation and a second finite element model for force field simulation in simulation software based on the three-dimensional model;

[0007] Assigning material properties to the first finite element model and the second finite element model respectively;

[0008] Performing heat transfer simulation on the first finite element model to obtain temperature distribution data of the motor housing;

[0009] Converting the temperature distribution data into a format that can be recognized by mechanical simulation;

[0010] The mechanical force load data of the motor housing is acquired, and the temperature distribution data and the mechanical force load data are loaded into the second finite element model, and the force field simulation is performed on the second finite element model to obtain the strength analysis result of the motor housing.

[0011] Optionally, establishing a first finite element model for heat transfer simulation and a second finite element model for force field simulation in simulation software based on the three-dimensional model respectively includes:

[0012] Setting the unit type of the three-dimensional model to a type corresponding to heat transfer simulation, and outputting the three-dimensional model as the first finite element model;

[0013] The unit type of the three-dimensional model is set to a type corresponding to the force field simulation, and the three-dimensional model is output as the second finite element model.

[0014] Optionally, respectively assigning material properties to the first finite element model and the second finite element model includes:

[0015] Assigning values ​​to conductivity, specific heat capacity, density, elastic modulus and Poisson's ratio of the first finite element model respectively;

[0016] The thermal expansion coefficient, density, material plastic section, elastic modulus and Poisson's ratio of the second finite element model are assigned values ​​respectively.

[0017] Optionally, performing heat transfer simulation on the first finite element model to obtain temperature distribution data of the motor housing includes:

[0018] creating a first load editor and a second load editor for the first finite element model respectively;

[0019] Setting a temperature value of an inner surface of the first finite element model in the first load editor, and setting a temperature value of an outer surface of the first finite element model in the second load editor;

[0020] Creating a working condition editor for the first finite element model, selecting the first load editor and the second load editor in the working condition editor, and setting the analysis type of the working condition editor to heat transfer;

[0021] A heat transfer analysis model of the first finite element model is exported, and the temperature distribution data in a table form is exported.

[0022] Optionally, the temperature distribution data in the form of a export table includes:

[0023] In the result reading software, set the result type displayed in the result cloud graph to temperature;

[0024] Select all nodes in the result list display of the result reading software to obtain the temperature distribution data in a list form;

[0025] The temperature distribution data in list form is exported into a table form.

[0026] Optionally, converting the format of the temperature distribution data into a format recognizable by mechanical simulation includes:

[0027] Modify the header of the node ID column of the table to "*temperature", change the information of all columns except the node ID column and the temperature column to a separator "," and delete the headers of all columns except the node ID column;

[0028] Save the table in .txt format.

[0029] Optionally, the step of loading the temperature distribution data and the mechanical force load data into the second finite element model, performing force field simulation on the second finite element model, and obtaining a strength analysis result of the motor housing includes:

[0030] Respectively create a third load editor, a fourth load editor and a working condition editor of the second finite element model, select the third load editor and the fourth load editor in the working condition editor, and set the analysis type of the working condition editor to static;

[0031] Exporting the force field analysis model of the second finite element model to obtain a force field analysis model file;

[0032] adding the temperature distribution data and the mechanical force load data to the force field analysis model file;

[0033] The force field analysis model is derived again to obtain the strength analysis result of the motor housing.

[0034] On the other hand, the present invention also provides the following technical solutions:

[0035] A motor housing strength analysis device, comprising:

[0036] A finite element modeling module, used for acquiring a three-dimensional model of the motor housing, and establishing a first finite element model for heat transfer simulation and a second finite element model for force field simulation in the simulation software based on the three-dimensional model;

[0037] A material assignment module, used to assign material properties to the first finite element model and the second finite element model respectively;

[0038] A heat transfer simulation module, used for performing heat transfer simulation on the first finite element model to obtain temperature distribution data of the motor housing;

[0039] A format conversion module, used to convert the format of the temperature distribution data into a format recognizable by mechanical simulation;

[0040] A force field simulation module is used to obtain the mechanical force load data of the motor housing, and load the temperature distribution data and the mechanical force load data into the second finite element model, perform force field simulation on the second finite element model, and obtain the strength analysis result of the motor housing.

[0041] On the other hand, the present invention also provides the following technical solutions:

[0042] A computer device comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any one of the above-mentioned methods for analyzing the strength of a motor housing.

[0043] On the other hand, the present invention also provides the following technical solutions:

[0044] A computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the steps of any one of the above-mentioned methods for analyzing the strength of a motor housing.

[0045] One or more technical solutions provided by the present invention have at least the following technical effects or advantages:

[0046] The present invention establishes a heat transfer simulation finite element model and a force field simulation finite element model of the motor case in simulation software based on a three-dimensional model of the motor case, assigns material properties to the heat transfer simulation finite element model and the force field simulation finite element model, performs heat transfer simulation on the heat transfer simulation finite element model, obtains temperature distribution data of the motor case, converts the format of the temperature distribution data into a format recognizable by mechanical simulation, and loads the temperature distribution data and existing mechanical force load data into the force field simulation finite element model for force field simulation, obtains the strength analysis result of the motor case, realizes the simulation analysis of the strength reliability of the motor case, takes the influence of temperature into consideration when performing the force field simulation, and improves the reliability of the strength analysis result of the motor case. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0048] Figure 1 is a flow chart of a motor housing strength analysis method according to an embodiment of the present invention;

[0049] Figure 2 is a schematic diagram of a three-dimensional model of a motor housing in an embodiment of the present invention;

[0050] Figure 3 A schematic diagram of cleaning redundant geometric lines of a three-dimensional model in an embodiment of the present invention;

[0051] Figure 4 is a schematic diagram of a first finite element model in an embodiment of the present invention;

[0052] Figure 5is a schematic diagram of a second finite element model in an embodiment of the present invention;

[0053] Figure 6 is a schematic diagram of a first load editor and a second load editor in an embodiment of the present invention;

[0054] Figure 7 A schematic diagram of creating a heat transfer analysis condition in an embodiment of the present invention;

[0055] Figure 8 is a schematic diagram of a heat transfer analysis model in an embodiment of the present invention;

[0056] Fig. 9 is another schematic diagram of a heat transfer analysis model in an embodiment of the present invention;

[0057] Fig.10 A schematic diagram of temperature distribution data in a tabular form in an embodiment of the present invention;

[0058] Fig.11 A schematic diagram of temperature distribution data in a tabular form in an embodiment of the present invention;

[0059] Fig.12 This is a schematic diagram of temperature distribution data in .txt format in an embodiment of the present invention;

[0060] Fig.13 A schematic diagram of mechanical force load data in an embodiment of the present invention;

[0061] Fig.14 is a schematic diagram of a third load editor and a fourth load editor in an embodiment of the present invention;

[0062] Fig.15 A schematic diagram of creating a force field analysis working condition in an embodiment of the present invention;

[0063] Fig.16 A schematic diagram of a force field analysis model file in an embodiment of the present invention;

[0064] Fig.17 Schematic diagram of the motor housing strength analysis results under the influence of temperature and mechanical load in an embodiment of the present invention;

[0065] Fig.18 A schematic diagram of the motor housing strength analysis result under the influence of mechanical load in an embodiment of the present invention;

[0066] Fig.19 Schematic diagram of a motor housing strength analysis device in an embodiment of the present invention. DETAILED DESCRIPTION

[0067] The embodiments of the present invention solve the technical problem of how to analyze the strength reliability of a motor housing by providing a motor housing strength analysis method and device.

[0068] In order to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0069] like Figure 1 As shown, the motor housing strength analysis method according to the embodiment of the present invention comprises:

[0070] Step S1, obtaining a three-dimensional model of the motor housing, and establishing a first finite element model for heat transfer simulation and a second finite element model for force field simulation in simulation software based on the three-dimensional model;

[0071] Step S2, assigning material properties to the first finite element model and the second finite element model respectively;

[0072] Step S3, performing heat transfer simulation on the first finite element model to obtain temperature distribution data of the motor housing;

[0073] Step S4, converting the format of the temperature distribution data into a format that can be recognized by mechanical simulation;

[0074] Step S5, obtaining the mechanical force load data of the motor housing, and loading the temperature distribution data and the mechanical force load data into the second finite element model, performing force field simulation on the second finite element model, and obtaining the strength analysis result of the motor housing.

[0075] In some embodiments, the simulation software may include hypermesh software and hyperview software.

[0076] like Figure 2 As shown, in step S1, the acquisition of the three-dimensional model of the motor housing may include: in response to the user clicking the import button of the hypermesh software, importing the CAD data of the motor housing to obtain the three-dimensional model of the motor housing. In order to prevent the appearance of extremely small grid units due to the excessive density of local geometric lines, in some embodiments, it is necessary to clean up redundant geometric lines of the three-dimensional model, such as Figure 3 shown.

[0077] In some embodiments, in step S1, the establishment of a first finite element model for heat transfer simulation and a second finite element model for force field simulation in the simulation software based on the three-dimensional model may include: setting the unit type of the three-dimensional model to the type corresponding to the heat transfer simulation, and outputting the three-dimensional model as a first finite element model; setting the unit type of the three-dimensional model to the type corresponding to the force field simulation, and outputting the three-dimensional model as a second finite element model. First, mesh the three-dimensional model in the mesh division (auto mesh) interface of the hypermesh software, including inputting the mesh size (element size). The mesh size requirements are: the average size is 3mm, the minimum size is greater than 1mm, and the maximum size is less than 5mm. Then, the unit type is set in the mesh type (elem types) interface of the hypermesh software. The unit type corresponding to the heat transfer simulation is DC3D4, and the three-dimensional model is output as the first finite element model, such as Figure 4 As shown; the unit type corresponding to the force field simulation is C3D4, and the three-dimensional model is output as the second finite element model, such as Figure 5 Except for the different element types, all other settings such as node ID and element ID of the first finite element model and the second finite element model need to be completely consistent.

[0078] In some embodiments, step S2 may include: assigning values ​​to the conductivity, specific heat capacity, density, elastic modulus, and Poisson's ratio of the first finite element model respectively; assigning values ​​to the thermal expansion coefficient, density, material plastic segment, elastic modulus, and Poisson's ratio of the second finite element model respectively. First, right-click "create" in the hypermesh software, and then select the material editor (material). Then, in the material editor of the first finite element model, activate the option boxes of conductivity, specific heat capacity, density, elastic modulus, Poisson's ratio, etc. in turn and fill in the corresponding parameters, and in the material editor of the second finite element model, activate the option boxes of density, elastic modulus, Poisson's ratio, thermal expansion coefficient, material plastic segment, etc. in turn and fill in the corresponding parameters.

[0079] In some embodiments, step S3 may include: respectively creating a first load editor and a second load editor for the first finite element model; setting the temperature value of the inner surface of the first finite element model in the first load editor, and setting the temperature value of the outer surface of the first finite element model in the second load editor; creating a working condition editor for the first finite element model, selecting the first load editor and the second load editor in the working condition editor, and setting the analysis type of the working condition editor to heat transfer; exporting the heat transfer analysis model of the first finite element model, and exporting the temperature distribution data in tabular form.

[0080] like Figure 6As shown, in the hypermesh software, right-click "create", then select the load editor (load collector), create two load editors and name them high-temperature and low-temperature respectively. Activate the high-temperature load editor (first load editor), select all nodes on the inner surface of the motor housing in the temperature load editing interface, and set the temperature (value) to 150°C, representing the high temperature area on the inner surface of the motor housing. Activate the low-temperature load editor (second load editor), select all nodes on the outer surface of the motor housing in the temperature load editing interface, and set the temperature (value) to 25°C, representing the low temperature area on the outer surface of the motor housing. In the hypermesh software, right-click "create", then select the load step editor (load step), set the analysis type (Analysis) to heat transfer in the load step editor, and select the low-temperature load editor and high-temperature load editor created previously, as shown Figure 7 Click the export button in the hypermesh software to obtain the heat transfer analysis model of the first finite element model, as shown in Figure 8 shown.

[0081] In step S3, the exporting of the temperature distribution data in a table format may include: setting the result type displayed in the result cloud map to temperature in the result reading software; selecting all nodes in the result list display of the result reading software to obtain the temperature distribution data in a table format; and exporting the temperature distribution data in the table format to a table format. Fig. 9 As shown, in the result reading software Hyperview, click the result cloud display button, set the result type (Result type) to temperature (Nodal temperature), and you can get the temperature distribution data of the motor housing. Fig.10 As shown, in the HyperView software, click the result list display button, select all the nodes of the first finite element model, and present the temperature distribution data (Nodaltemperature) in the form of a list. Then click the export button (export) to export the temperature distribution data in the form of an Excel table, as shown in the figure below: Fig.11 shown.

[0082] Step S4 may include: modifying the header of the node ID column of the temperature distribution data table to "*temperature", changing the information of all columns except the node ID column and the temperature column to a separator "," and deleting the headers of all columns except the node ID column; saving the temperature distribution data table in .txt format. Modify the header of the node ID column (node ​​ID) from "node ID" to "*temperature"; since the original temperature distribution data table uses spaces as separators and cannot be recognized during simulation, it is necessary to change the information of columns B, D, and E to separators "," that can be recognized by the simulation; finally, save the temperature distribution data table from .csv format to .txt format, such as Fig.12 shown.

[0083] like Fig.13 As shown, the mechanical force load data is a known .txt format data and can be used directly. In step S5, the temperature distribution data and the mechanical force load data are loaded into the second finite element model, and the force field simulation is performed on the second finite element model to obtain the strength analysis result of the motor housing. It can include: creating a third load editor, a fourth load editor and a working condition editor of the second finite element model respectively, selecting the third load editor and the fourth load editor in the working condition editor, and setting the analysis type of the working condition editor to static; exporting the force field analysis model of the second finite element model to obtain a force field analysis model file; adding the temperature distribution data and the mechanical force load data to the force field analysis model file; exporting the force field analysis model again to obtain the strength analysis result of the motor housing.

[0084] like Fig.14 As shown, in the hypermesh software, right-click "create", then select the load collector, create two load editors, named force and temperature, respectively. The force load editor is the third load editor, and the temperature load editor is the fourth load editor. Fig.15 As shown, in the hypermesh software, right-click "create", then select the load step editor, set the analysis type (Analysis) to static (Static) in the load step editor, and select the force load editor and temperature load editor created previously. Fig.16As shown, click the export button in the hypermesh software to obtain the force field analysis model of the second finite element model and output the force field analysis model file (Motor casing_strength_analysis.inp). At this time, the data in the force field analysis model file (Motor casing_strength_analysis.inp) is empty. Use text to open the temperature load editor, copy the temperature distribution data in .txt format to the temperature load editor, and complete the loading of the temperature distribution data; use text to open the force load editor, copy the mechanical force load data in .txt format to the force load editor, and complete the loading of the mechanical force load data. Finally, export the force field analysis model of the second finite element model again, and you can get the following Fig.17 The strength analysis results of the motor housing are shown in Fig.17 The risk area of ​​excessive stress and the maximum stress risk value can be obtained.

[0085] The embodiment of the present invention also performs force field simulation on the second finite element model loaded with only mechanical force load data, and obtains the following Fig.18 The strength analysis results of the motor housing are shown. Fig.17 and 18 It can be seen that if the influence of temperature is not considered, the strength analysis results of the motor housing will miss some strength risks, such as the risk area of ​​excessive stress and the maximum stress risk. In practice, a large current flowing through the motor will generate a large amount of resistance heat, causing the internal temperature of the motor to rise (the temperature of the motor itself can reach about 150°C), and the motor housing must also remain reliable under the continuous action of high temperature. Therefore, the embodiment of the present invention takes into account the influence of temperature in the force field simulation of the motor housing, thereby improving the reliability of the strength analysis results of the motor housing.

[0086] like Fig.19 As shown, the embodiment of the present invention also provides a motor housing strength analysis device, comprising:

[0087] A finite element modeling module, used for obtaining a three-dimensional model of the motor housing, and establishing a first finite element model for heat transfer simulation and a second finite element model for force field simulation in the simulation software based on the three-dimensional model;

[0088] A material assignment module, used for assigning material properties to the first finite element model and the second finite element model respectively;

[0089] A heat transfer simulation module, used to perform heat transfer simulation on the first finite element model to obtain temperature distribution data of the motor housing;

[0090] A format conversion module is used to convert the format of temperature distribution data into a format that can be recognized by mechanical simulation;

[0091] The force field simulation module is used to obtain the mechanical force load data of the motor housing, and load the temperature distribution data and the mechanical force load data into the second finite element model, perform force field simulation on the second finite element model, and obtain the strength analysis result of the motor housing.

[0092] Furthermore, the finite element modeling module can be specifically used for:

[0093] Set the unit type of the three-dimensional model to a type corresponding to the heat transfer simulation, and output the three-dimensional model as a first finite element model;

[0094] Set the unit type of the 3D model to the type corresponding to the force field simulation, and output the 3D model as the second finite element model.

[0095] Furthermore, the material assignment module can be specifically used for:

[0096] Assign values ​​to the conductivity, specific heat capacity, density, elastic modulus and Poisson's ratio of the first finite element model respectively;

[0097] The thermal expansion coefficient, density, material plastic segment, elastic modulus and Poisson's ratio of the second finite element model are assigned values ​​respectively.

[0098] Furthermore, the heat transfer simulation module can be specifically used for:

[0099] creating a first load editor and a second load editor for the first finite element model respectively;

[0100] Setting a temperature value of an inner surface of the first finite element model in the first load editor, and setting a temperature value of an outer surface of the first finite element model in the second load editor;

[0101] Create a load case editor for the first finite element model, select the first load editor and the second load editor in the load case editor, and set the analysis type of the load case editor to heat transfer;

[0102] The heat transfer analysis model of the first finite element model is exported, and the temperature distribution data in a tabular form is exported.

[0103] Furthermore, the heat transfer simulation module can also be used for:

[0104] In the result reading software, set the result type displayed in the result cloud graph to temperature;

[0105] Select all nodes in the result list display of the result reading software to obtain the temperature distribution data in the form of a list;

[0106] Exports temperature distribution data in tabular form to a table.

[0107] Furthermore, the format conversion module can be specifically used for:

[0108] Change the header of the node ID column of the temperature distribution data table to "*temperature", change the information of all columns except the node ID column and the temperature column to the separator "," and delete the headers of all columns except the node ID column; save the temperature distribution data table in .txt format.

[0109] Furthermore, the force field simulation module can be used specifically for:

[0110] Create the third load editor, the fourth load editor and the working condition editor of the second finite element model respectively, select the third load editor and the fourth load editor in the working condition editor, and set the analysis type of the working condition editor to static;

[0111] Export the force field analysis model of the second finite element model to obtain a force field analysis model file;

[0112] Add temperature distribution data and mechanical force load data to the force field analysis model file;

[0113] The force field analysis model is derived again to obtain the strength analysis results of the motor housing.

[0114] Based on the same inventive concept as the motor housing strength analysis method mentioned above, an embodiment of the present invention also provides a computer device, including a memory, a processor and a computer program stored in the memory, and the processor executes the computer program to implement the steps of any one of the motor housing strength analysis methods mentioned above.

[0115] Since the computer device introduced in the embodiment of the present invention is a computer device used to implement the motor housing strength analysis method in the embodiment of the present invention, based on the motor housing strength analysis method introduced in the embodiment of the present invention, the technical personnel in the field can understand the specific implementation of the computer device in the embodiment of the present invention and its various variations, so how the computer device implements the method in the embodiment of the present invention is not described in detail here. As long as the computer device used by the technical personnel in the field to implement the motor housing strength analysis method in the embodiment of the present invention, it belongs to the scope of protection of the present invention.

[0116] Based on the same inventive concept as the motor housing strength analysis method described above, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the motor housing strength analysis methods described above.

[0117] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0118] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0119] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0120] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0121] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A motor housing strength analysis method, characterized in that: include: Acquire a three-dimensional model of the motor housing, and establish a first finite element model for heat transfer simulation and a second finite element model for force field simulation in simulation software based on the three-dimensional model; Assigning material properties to the first finite element model and the second finite element model respectively; Performing heat transfer simulation on the first finite element model to obtain temperature distribution data of the motor housing; Converting the temperature distribution data into a format that can be recognized by mechanical simulation; The mechanical force load data of the motor housing is acquired, and the temperature distribution data and the mechanical force load data are loaded into the second finite element model, and the force field simulation is performed on the second finite element model to obtain the strength analysis result of the motor housing.

2. The motor housing strength analysis method according to claim 1, characterized in that: The method of establishing a first finite element model for heat transfer simulation and a second finite element model for force field simulation in the simulation software based on the three-dimensional model comprises: Setting the unit type of the three-dimensional model to a type corresponding to heat transfer simulation, and outputting the three-dimensional model as the first finite element model; The unit type of the three-dimensional model is set to a type corresponding to the force field simulation, and the three-dimensional model is output as the second finite element model.

3. The motor housing strength analysis method according to claim 1, characterized in that: The assigning material properties to the first finite element model and the second finite element model respectively includes: Assigning values ​​to conductivity, specific heat capacity, density, elastic modulus and Poisson's ratio of the first finite element model respectively; The thermal expansion coefficient, density, material plastic section, elastic modulus and Poisson's ratio of the second finite element model are assigned values ​​respectively.

4. The motor housing strength analysis method according to claim 1, characterized in that: The performing heat transfer simulation on the first finite element model to obtain temperature distribution data of the motor housing includes: creating a first load editor and a second load editor for the first finite element model respectively; Setting a temperature value of an inner surface of the first finite element model in the first load editor, and setting a temperature value of an outer surface of the first finite element model in the second load editor; Creating a working condition editor for the first finite element model, selecting the first load editor and the second load editor in the working condition editor, and setting the analysis type of the working condition editor to heat transfer; A heat transfer analysis model of the first finite element model is exported, and the temperature distribution data in a table form is exported.

5. The motor housing strength analysis method according to claim 4, characterized in that: The temperature distribution data in the form of a derived table includes: In the result reading software, set the result type displayed in the result cloud graph to temperature; Select all nodes in the result list display of the result reading software to obtain the temperature distribution data in a list form; The temperature distribution data in list form is exported into a table form.

6. The motor housing strength analysis method according to claim 4, characterized in that: The step of converting the format of the temperature distribution data into a format recognizable by mechanical simulation includes: Modify the header of the node ID column of the table to "*temperature", change the information of all columns except the node ID column and the temperature column to a separator "," and delete the headers of all columns except the node ID column; Save the table in .txt format.

7. The motor housing strength analysis method according to claim 1, characterized in that: The step of loading the temperature distribution data and the mechanical force load data into the second finite element model, performing force field simulation on the second finite element model, and obtaining the strength analysis result of the motor housing includes: Respectively create a third load editor, a fourth load editor and a working condition editor of the second finite element model, select the third load editor and the fourth load editor in the working condition editor, and set the analysis type of the working condition editor to static; exporting the force field analysis model of the second finite element model to obtain a force field analysis model file; adding the temperature distribution data and the mechanical force load data to the force field analysis model file; The force field analysis model is derived again to obtain the strength analysis result of the motor housing.

8. A motor housing strength analysis device, characterized in that: include: A finite element modeling module, used for acquiring a three-dimensional model of the motor housing, and establishing a first finite element model for heat transfer simulation and a second finite element model for force field simulation in the simulation software based on the three-dimensional model; A material assignment module, used to assign material properties to the first finite element model and the second finite element model respectively; A heat transfer simulation module, used for performing heat transfer simulation on the first finite element model to obtain temperature distribution data of the motor housing; A format conversion module, used to convert the format of the temperature distribution data into a format recognizable by mechanical simulation; A force field simulation module is used to obtain the mechanical force load data of the motor housing, and load the temperature distribution data and the mechanical force load data into the second finite element model, perform force field simulation on the second finite element model, and obtain the strength analysis result of the motor housing.

9. A computer device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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