Motor rotor modal simulation analysis method and storage medium

Abstract

The invention relates to a motor rotor modal simulation analysis method, which comprises the following steps that a motor rotor assembly finite element model is established, the motor rotor assembly finite element model comprises a plurality of skewed pole section finite element models, two opposite first end surfaces between two adjacent skewed pole section finite element models are connected through a plurality of first connecting units, and a plurality of second connecting units are connected between two adjacent skewed pole section finite element models; each first connecting unit comprises two first flexible units and a first spring unit, wherein the two first flexible units are respectively created on the two first end surfaces, and the first spring unit is connected between the two first flexible units; and performing modal simulation analysis by adopting the motor rotor assembly finite element model to obtain a modal shape simulation result of the motor rotor assembly finite element model and a corresponding actual measurement modal frequency simulation result. The invention further provides a storage medium. According to the invention, the accuracy of motor rotor modal simulation analysis is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a method for modal simulation analysis of a motor rotor and a storage medium. Background Art

[0002] With the increasing maturity of the new energy vehicle industry, the comfort of vehicles, especially the vibration and noise performance, has attracted more and more attention. Different from the engine noise of traditional fuel vehicles, the noise source of new energy vehicles is mainly the order noise of the drive motor. The characteristic of this kind of noise is that the overall noise value is not large, but the frequency is relatively high, which is likely to cause annoyance to passengers and drivers. And the main noise excitation of the motor is generated by the motor rotor under electromagnetic action. Therefore, accurate finite element modeling and modal simulation of the motor rotor have become the key to studying motor noise.

[0003] In the design process of permanent magnet synchronous motors, in order to reduce the eddy current loss of the motor rotor, the rotor core is often formed by stacking thin silicon steel sheets along the axial direction. For the rotor core, in order to further suppress torque ripple and improve vibration and noise performance, a segmented skewed pole design is also adopted. Therefore, the rotor core is a laminated and segmented structure rather than a solid structure. That is to say, the rotor core includes multiple skewed pole segments, which brings great difficulties to the modal simulation of the motor rotor.

[0004] In the existing methods for modal simulation analysis of motor rotors, most of them simplify the rotor core into a solid structure for modeling, without considering or not fully considering the actual connection relationship between the skewed pole segments and between the skewed pole segments and the rotor retaining plate, and then directly assign the material properties of the silicon steel sheet to conduct modal simulation analysis of the motor rotor, resulting in a large difference between the simulation results and the test results. Summary of the Invention

[0005] The object of the present invention is to propose a method for modal simulation analysis of a motor rotor and a storage medium to alleviate or eliminate at least one of the above technical problems.

[0006] A method for modal simulation analysis of a motor rotor according to the present invention includes the following steps:

[0007] Establish a finite element model of the motor rotor assembly, where the finite element model of the motor rotor assembly includes a plurality of finite element models of the skewed pole segments, and two opposite first end faces between adjacent two finite element models of the skewed pole segments are connected by a plurality of first connection units. Each first connection unit includes two first flexible units respectively created on the two first end faces and a first spring unit connected between the two first flexible units;

[0008] Perform modal simulation analysis using the finite element model of the motor rotor assembly to obtain the modal vibration mode simulation results and the corresponding measured modal frequency simulation results of the finite element model of the motor rotor assembly.

[0009] Optionally, establishing the finite element model of the motor rotor assembly includes the following steps: create a plurality of first connection regions on each of the two first end faces, and create the first flexible units in each of the first connection regions.

[0010] Optionally, a plurality of the first connection units are evenly distributed around the rotor center hole of the finite element model of the motor rotor assembly.

[0011] Optionally, the larger the outer diameter of a plurality of the skewed pole segment finite element models, the more the number of the first connection units between two adjacent skewed pole segment finite element models; the more the number of pole pairs of a plurality of the skewed pole segment finite element models, the more the number of the first connection units between two adjacent skewed pole segment finite element models.

[0012] Optionally, the finite element model of the motor rotor assembly further includes a rotor pressing plate finite element model. The end face of the rotor pressing plate finite element model facing a plurality of the skewed pole segments is the second end face, and the end face of the skewed pole segment finite element model adjacent to the rotor pressing plate finite element model facing the rotor pressing plate finite element model is the third end face. The second end face and the third end face are connected by a plurality of second connection units. Each second connection unit includes two second flexible units and a second spring unit connected between the two second flexible units. The two second flexible units are respectively created between the second end face and the third end face.

[0013] Optionally, establishing the finite element model of the motor rotor assembly includes the following steps: create a plurality of second connection regions on the second end face and the third end face respectively, and create second flexible units at each of the second connection regions.

[0014] Optionally, the motor rotor modal simulation analysis method includes the following steps:

[0015] Establish a finite element model of a single skewed pole segment;

[0016] Determine the initial material property parameters of a single skewed pole segment finite element model;

[0017] Substitute the initial material property parameters into a single skewed pole segment finite element model, import the single skewed pole segment finite element model into finite element software for modal simulation analysis, and obtain the initial modal vibration mode results and the corresponding initial modal frequency results of the single skewed pole segment finite element model.

[0018] Compare the initial modal vibration mode results and the corresponding initial modal frequency results of a single slant pole segment finite element model with the measured modal vibration modes and the corresponding measured modal frequencies of a single slant pole segment obtained by the hammer impact method, and use the optimization module in the finite element software to optimize to obtain the optimized results of the material property parameters of a single slant pole segment finite element model;

[0019] Substitute the optimized results of the material property parameters into a single slant pole segment finite element model, and perform modal simulation analysis to obtain the modal vibration mode simulation results and the corresponding modal frequency simulation results of a single slant pole segment finite element model.

[0020] Optionally, the motor rotor modal simulation analysis method further includes the following steps:

[0021] Substitute the optimized results of the material property parameters into the motor rotor assembly finite element model, and given the initial stiffness parameters of each spring element, perform modal simulation analysis to obtain the initial modal vibration mode results and the corresponding initial modal frequency results of the motor rotor assembly;

[0022] Compare the initial modal vibration mode results and the corresponding initial modal frequency results of the motor rotor assembly finite element model with the measured modal vibration modes and the corresponding measured modal frequencies of the motor rotor assembly obtained by the hammer impact method, and use the optimization module in the finite element software to optimize to obtain the optimized results of the stiffness parameters of each spring element;

[0023] Substitute the optimized results of the stiffness parameters into the motor rotor assembly finite element model, and perform modal simulation analysis to obtain the modal vibration mode simulation results and the corresponding modal frequency simulation results of the motor rotor assembly finite element model.

[0024] Optionally, the motor rotor modal simulation analysis method further includes the following steps: Perform modal tests on the slant pole segment and the motor rotor assembly respectively by the hammer impact method to obtain the measured modal vibration modes and the corresponding measured modal frequencies of the slant pole segment and the motor rotor assembly.

[0025] The present invention also proposes a storage medium, on which a computer program is stored, and the computer program is executed by a processor to be used to implement the motor rotor modal simulation analysis method described in any one of the above.

[0026] The present invention improves the accuracy of motor rotor modal simulation analysis. Description of the Drawings

[0027] Figure 1 It is a flowchart of the motor rotor modal simulation analysis method described in some embodiments;

[0028] Figure 2Schematic diagram of the first end face of the skew pole segment finite element model described in some embodiments;

[0029] Figure 3 Schematic diagram of the skew pole segment finite element model described in some embodiments when creating the first flexible element is completed;

[0030] Figure 4 Schematic diagram of two adjacent skew pole segment finite element models connected by a plurality of first connection units described in some embodiments. Detailed implementation manners

[0031] The following will illustrate the implementation manners of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, rather than for limiting the protection scope of the present invention.

[0032] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0033] As Figure 1 shown, a method for modal simulation analysis of a motor rotor includes the following steps:

[0034] S100: Establish a finite element model of the motor rotor assembly. As Figure 3 and Figure 4 shown, the finite element model of the motor rotor assembly includes a plurality of skew pole segment finite element models 1. Two opposite first end faces between two adjacent skew pole segment finite element models 1 are connected by a plurality of first connection units. Each first connection unit includes two first flexible units 13 respectively created on two first end faces 11 and a first spring unit 2 connected between the two first flexible units;

[0035] S200: Perform modal simulation analysis using the finite element model of the motor rotor assembly to obtain the modal vibration mode simulation result and the corresponding measured modal frequency simulation result of the finite element model of the motor rotor assembly.

[0036] Adopting the above technical solution, when establishing the finite element model of the motor rotor assembly, the above-mentioned multiple first connection units are used to establish connections between adjacent two skew pole segment finite element models, which can more realistically and reasonably reflect the connection relationship between the skew pole segments in the finite element model, thereby improving the model accuracy of the motor rotor assembly finite element model and contributing to improving the accuracy of the motor rotor modal simulation analysis.

[0037] Moreover, since the two opposite first end faces between adjacent two skew pole segment finite element models are connected by multiple first connection units, when there are different connection stiffness requirements for different skew pole segment finite element models, the number and setting positions of the multiple first connection units can be correspondingly adjusted, which has the characteristics of easy adjustment and wide application range.

[0038] In some embodiments, as Figure 2 shown, establishing the finite element model of the motor rotor assembly includes the following steps: creating multiple first connection regions 12 on the two first end faces respectively, and creating first flexible units 13 in each first connection region 12. Since there are many first connection units in the finite element model of the motor rotor assembly, it takes a lot of time to establish multiple first connection units respectively. By creating the first connection regions and combining with the computer program written by Matlab, the creation of the first connection units between the corresponding first connection regions can be automatically realized by executing the program. It is equivalent to creating the first connection units as a template. After establishing the first connection regions, the first connection units are directly created between the corresponding first connection regions by using the template, which helps to improve the simulation efficiency.

[0039] As a specific example, the multiple first connection units are evenly distributed around the rotor center hole of the finite element model of the motor rotor assembly. The area between the rotor center hole and the magnet mounting portion 14 can easily provide layout points for the multiple first connection units, which has the characteristic of easy implementation.

[0040] In some embodiments, the larger the outer diameter of the multiple skew pole segment finite element models, the more the number of first connection units between adjacent two skew pole segment finite element models; the more the number of pole pairs of the multiple skew pole segment finite element models, the more the number of first connection units between adjacent two skew pole segment finite element models. It can better meet the connection requirements of the skew pole segment finite element models of different motor rotor assembly finite element models.

[0041] In some embodiments, the finite element model of the motor rotor assembly further includes a finite element model of the rotor back plate. The end face of the finite element model of the rotor back plate facing the plurality of skew pole segments is the second end face, and the end face of the skew pole segment finite element model adjacent to the finite element model of the rotor back plate facing the finite element model of the rotor back plate is the third end face. The second end face and the third end face are connected by a plurality of second connection units. Each second connection unit includes two second flexible units and a second spring unit connected between the two second flexible units. The two second flexible units are respectively created between the second end face and the third end face.

[0042] With the above technical solution, when establishing the finite element model of the motor rotor assembly, the above-mentioned plurality of second connection units are used to establish a connection between the finite element model of the rotor back plate and the finite element model of the skew pole segment, which can more realistically and reasonably reflect the connection relationship between the rotor back plate and the skew pole segment in the finite element model, thereby improving the model accuracy of the finite element model of the motor rotor assembly and contributing to improving the accuracy of the modal simulation analysis of the motor rotor.

[0043] In some embodiments, establishing the finite element model of the motor rotor assembly includes the following steps: creating a plurality of second connection regions on the second end face and the third end face respectively, and creating second flexible units at each second connection region. By creating the second connection regions, it helps to improve the simulation efficiency.

[0044] In specific implementation, the creation method of the second connection unit can be the same as that of the first connection unit, the creation method of the second connection region can be the same as that of the first connection region, the creation method of the second flexible unit can be the same as that of the first flexible unit, and the creation method of the second spring unit can be the same as that of the first spring unit.

[0045] In some embodiments, the motor rotor modal simulation analysis method includes the following steps:

[0046] Establish a finite element model of a single skew pole segment;

[0047] Determine the initial material property parameters of the finite element model of a single skew pole segment;

[0048] Substitute the initial material property parameters into the finite element model of a single skew pole segment, import the finite element model of a single skew pole segment into the finite element software for modal simulation analysis, and obtain the initial modal vibration mode results and the corresponding initial modal frequency results of the finite element model of a single skew pole segment;

[0049] Compare the initial modal vibration mode results and the corresponding initial modal frequency results of the single inclined pole segment finite element model with the measured modal vibration modes and the corresponding measured modal frequencies of the single inclined pole segment obtained by the hammering method, and use the optimization module in the finite element software for optimization to obtain the optimized results of the material property parameters of the single inclined pole segment finite element model;

[0050] Substitute the optimized results of the material property parameters into the single inclined pole segment finite element model, perform modal simulation analysis, and obtain the modal vibration mode simulation results and the corresponding modal frequency simulation results of the single inclined pole segment finite element model.

[0051] Adopting the above technical solution can obtain more accurate material property parameters of the inclined pole segment finite element model, and then obtain a more accurate finite element model and more accurate simulation results. Moreover, through the more accurate material property parameters of the inclined pole segment finite element model, it is also helpful to improve the accuracy of the finite element model of the motor rotor assembly, and further improve the accuracy of the modal simulation analysis of the motor rotor.

[0052] In some embodiments, the method for modal simulation analysis of the motor rotor further includes the following steps:

[0053] Substitute the optimized results of the material property parameters into the finite element model of the motor rotor assembly, and given the initial stiffness parameters of each spring element, perform modal simulation analysis to obtain the initial modal vibration mode results and the corresponding initial modal frequency results of the motor rotor assembly;

[0054] Compare the initial modal vibration mode results and the corresponding initial modal frequency results of the finite element model of the motor rotor assembly with the measured modal vibration modes and the corresponding measured modal frequencies of the motor rotor assembly obtained by the hammering method, and use the optimization module in the finite element software to optimize and obtain the optimized results of the stiffness parameters of each spring element;

[0055] Substitute the optimized results of the stiffness parameters into the finite element model of the motor rotor assembly, perform modal simulation analysis, and obtain the modal vibration mode simulation results and the corresponding modal frequency simulation results of the finite element model of the motor rotor assembly.

[0056] Adopting the above technical solution can obtain a more accurate finite element model of the motor rotor assembly. On the one hand, using the more accurate finite element model of the motor rotor assembly for modal simulation analysis can obtain more accurate simulation results. On the other hand, adopting the above technical solution can realize a finite element model of the motor rotor assembly that approximates the actual structure of the motor rotor assembly. Using this finite element model of the motor rotor assembly for vibration and noise simulation can replace the actual vibration and noise test, saving time and material costs.

[0057] In some embodiments, the motor rotor modal simulation analysis method further includes the following steps: performing vibration and noise simulation analysis using a motor rotor assembly finite element model to obtain a motor rotor assembly vibration and noise simulation analysis result.

[0058] In some embodiments, the motor rotor modal simulation and analysis method also includes the following steps: performing modal tests on the skewed pole segment and the motor rotor assembly respectively by a hammering method to obtain the measured modal vibration shapes and corresponding measured modal frequencies of the skewed pole segment and the motor rotor assembly.

[0059] More specifically, a motor rotor assembly product is used to more fully illustrate the motor rotor modal simulation analysis method with a specific example. The motor rotor modal simulation analysis method includes the following steps:

[0060] Step 1: Perform modal tests on the skewed pole segment and the motor rotor assembly respectively by hammering method to obtain the measured modal vibration shapes and corresponding measured modal frequencies of the skewed pole segment and the motor rotor assembly.

[0061] In the specific implementation, the specific process of the hammer method is: the measured skew pole segment and motor rotor assembly are suspended with elastic ropes to simulate the free state to ensure that the subsequent state is consistent with the simulation benchmark. The acceleration sensor is attached to the outer surface of the core, symmetrically distributed along the circumference, and the hammer strikes in the radial direction of the core. Obtain the measured modal vibration shape and measured modal frequency of the measured skew pole segment and motor rotor assembly. The measured modal vibration shape and measured modal frequency of the skew pole segment are shown in Table 1, and the measured modal vibration shape and measured modal frequency of the motor rotor assembly are shown in Table 2.

[0062]

[0063] Step 2: Establish a single skewed pole segment finite element model and a motor rotor assembly finite element model. The motor rotor assembly finite element model usually includes a motor shaft finite element model, a rotor pressure plate finite element model and a skewed pole segment finite element model. The skewed pole segment finite element model usually includes a rotor punching finite element model and a magnetic steel finite element model.

[0064] In specific implementation, Figure 2-4 As shown in the figure: For the connection between the rotor punchings, a first flexible unit plus a first spring unit is used. 6 to 8 first flexible units are created on the first end face of a single skewed pole segment according to the number of pole pairs, and the first connection area can be determined based on the outer diameter size and the number of pole pairs of the specific rotor. The skewed pole segment in this example has 4 pairs of pole pairs, 8 first flexible units are used, the diameter of the first connection area is 13 mm, and the first side surface of each skewed pole segment is treated in the same way. The center point of the bound first connection area is connected using the first spring unit.

[0065] Since a large number of flexible units and spring units are created, correspondingly, a computer program written in Matlab can be used to automatically create the flexible units and spring units between each inclined pole by executing this program.

[0066] Step 3: Determine the initial material property parameters of the inclined pole segment finite element model. The initial material property parameters are mainly elastic modulus, density, and Poisson's ratio. In particular, anisotropy needs to be given for the rotor punching sheet properties. As a specific example, the initial material property parameters are shown in Table 3.

[0067]

[0068] Step 4: Substitute the initial material property parameters into the single inclined pole segment finite element model, import the single inclined pole segment finite element model into the finite element software for modal simulation analysis, and obtain the initial modal vibration mode results and corresponding initial modal frequency results of the single inclined pole segment finite element model. As a specific example, the initial modal vibration mode results and corresponding initial modal frequency results of the single inclined pole segment finite element model are shown in Table 4.

[0069]

[0070] Step 5: Optimize the material parameters: Compare the initial modal vibration mode results and corresponding initial modal frequency results of the single inclined pole segment finite element model with the measured modal vibration modes and corresponding measured modal frequencies of the single inclined pole segment obtained by the hammering method, and use the optimization module in the finite element software for optimization to obtain the optimized results of the material property parameters of the single inclined pole segment finite element model.

[0071] The specific operation method is as follows: Set the modal results of the experimental test as the optimization goal, set the modal frequency corresponding to the initial modal vibration mode as the optimization object, set the Young's modulus, shear modulus, and Poisson's ratio of the rotor punching sheet as 9 optimization parameters, and use the direct optimization method or surface response optimization method in Ansys software for automatic optimization. After completion, the Young's modulus, elastic modulus, and Poisson's ratio of the rotor punching sheet can be obtained. The optimized material parameters are shown in Table 5.

[0072]

[0073] Step 6: Substitute the optimized results of the material property parameters into the single inclined pole segment finite element model for modal simulation analysis, and obtain the modal vibration mode simulation results and corresponding modal frequency simulation results of the single inclined pole segment finite element model. The comparison between the specific test results and simulation results of the single inclined pole segment is shown in Table 6.

[0074]

[0075] Step 7: Substitute the optimized results of the material property parameters into the finite element model of the motor rotor assembly, and given the initial stiffness parameters of each spring element, conduct modal simulation analysis to obtain the initial results of the modal vibration mode and the corresponding initial modal frequency of the motor rotor assembly. As a specific example, the initial stiffness parameters of the spring elements between the skewed pole segment finite element models and the spring elements between the skewed pole segment finite element model and the rotor back plate finite element model are shown in Table 7, and the initial results of the modal vibration mode and the corresponding initial modal frequency of the motor rotor assembly are shown in Table 8.

[0076]

[0077] Step 8: Compare the initial results of the modal vibration mode and the corresponding modal frequency of the motor rotor assembly finite element model with the measured modal vibration mode and the corresponding measured modal frequency of the motor rotor assembly obtained by the hammering method, and use the optimization module in the finite element software to optimize and obtain the optimized results of the stiffness parameters of each spring element. The optimized results of the stiffness parameters are shown in Table 9.

[0078]

[0079] Step 9: Substitute the optimized results of the stiffness parameters into the finite element model of the motor rotor assembly, conduct modal simulation analysis, and obtain the modal vibration mode simulation results and the corresponding modal frequency simulation results of the motor rotor assembly finite element model. The comparison between the free modal simulation results of the motor rotor assembly and the test results is shown in Table 10.

[0080]

[0081] The present invention also proposes a storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the motor rotor modal simulation analysis method described in any one of the above.

[0082] Compared with the prior art, the present invention has the advantages that the connection relationship between the skewed pole segments is more realistically and reasonably reflected in the finite element model, thereby improving the model accuracy; the connection area can be freely defined to distinguish the differences in the connection stiffness between different skewed pole segments, and the method proposed by the present invention can realize a finite element model approaching the actual motor rotor assembly, and substituting this model into the subsequent vibration and noise simulation to replace the actual vibration and noise test, thereby saving time and material costs.

[0083] The present invention provides a complete set of model calibration processes based on this simulation method, and can obtain a finite element model of the motor rotor structure with higher accuracy.

[0084] The present invention provides multi-one-dimensional calibratable model parameters, which can further improve the simulation accuracy of the motor rotor assembly mode and reduce the error from the test data.

[0085] The present invention can freely and quickly establish the connection relationship between the skewed pole segment finite element models and between the skewed pole segment finite element model and the rotor back plate finite element model by creating a connection area based on the positions of node coordinates.

[0086] The above embodiments are merely preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples", etc. means that the specific features, structures, materials or characteristics of the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

Claims

1. A motor rotor modal simulation analysis method, characterized in that: The following steps are involved: Establishing a finite element model of a motor rotor assembly, wherein the finite element model of the motor rotor assembly includes a plurality of finite element models of the skewed pole segment, wherein two first end surfaces opposite to each other between two adjacent finite element models of the skewed pole segment are connected by a plurality of first connecting units, and each of the first connecting units includes two first flexible units respectively created on the two first end surfaces and a first spring unit connected between the two first flexible units; The motor rotor assembly finite element model is used to perform modal simulation analysis to obtain the modal vibration shape simulation results of the motor rotor assembly finite element model and the corresponding measured modal frequency simulation results.

2. The motor rotor modal simulation analysis method according to claim 1, characterized in that: The establishing of the finite element model of the motor rotor assembly comprises the following steps: creating a plurality of first connection areas on the two first end faces respectively, and creating the first flexible unit in each of the first connection areas.

3. The motor rotor modal simulation analysis method according to claim 1, characterized in that: The plurality of first connection units are evenly distributed around the periphery of the rotor center hole of the finite element model of the motor rotor assembly.

4. The motor rotor modal simulation analysis method according to claim 1, characterized in that: The larger the outer diameter of the multiple inclined pole segment finite element models, the greater the number of the first connection units between two adjacent inclined pole segment finite element models; the greater the number of pole pairs of the multiple inclined pole segment finite element models, the greater the number of the first connection units between two adjacent inclined pole segment finite element models.

5. The motor rotor modal simulation analysis method according to claim 1, characterized in that: The motor rotor assembly finite element model also includes a rotor pressure plate finite element model, the end face of the rotor pressure plate finite element model facing the multiple oblique pole segments is a second end face, the end face of the oblique pole segment finite element model adjacent to the rotor pressure plate finite element model facing the rotor pressure plate finite element model is a third end face, the second end face and the third end face are connected by a plurality of second connecting units, each of the second connecting units includes two second flexible units and a second spring unit connected between the two second flexible units, and the two second flexible units are respectively created between the second end face and the third end face.

6. The motor rotor modal simulation analysis method according to claim 5, characterized in that: The establishing of the finite element model of the motor rotor assembly comprises the following steps: creating a plurality of second connection areas on the second end surface and the third end surface respectively, and creating a second flexible unit at each of the second connection areas.

7. The motor rotor modal simulation analysis method according to claim 1, characterized in that: The following steps are involved: Establish a finite element model of a single oblique pole segment; Determining initial material property parameters of a single finite element model of the oblique pole segment; Bringing the initial material property parameters into the single finite element model of the inclined pole segment, importing the single finite element model of the inclined pole segment into the finite element software for modal simulation analysis, and obtaining the initial results of the modal vibration shape and the corresponding initial results of the modal frequency of the single finite element model of the inclined pole segment; The initial results of the modal vibration shape and the corresponding initial results of the modal frequency of the single oblique pole segment finite element model are compared with the measured modal vibration shape and the corresponding measured modal frequency of the single oblique pole segment obtained by hammer test, and the optimization module in the finite element software is used to optimize the material property parameter optimization results of the single oblique pole segment finite element model; The material property parameter optimization results are brought into the single inclined pole segment finite element model to perform modal simulation analysis to obtain the modal vibration shape simulation results and the corresponding modal frequency simulation results of the single inclined pole segment finite element model.

8. The motor rotor modal simulation analysis method according to claim 7, characterized in that: The following steps are also included: The material property parameter optimization result is brought into the finite element model of the motor rotor assembly, and the initial stiffness parameters of each spring unit are given to perform modal simulation analysis to obtain the initial results of the modal vibration shape of the motor rotor assembly and the corresponding initial results of the modal frequency; The initial results of the modal vibration shape and the corresponding initial results of the modal frequency of the finite element model of the motor rotor assembly are compared with the measured modal vibration shape and the corresponding measured modal frequency of the motor rotor assembly obtained by hammer test, and the optimization module in the finite element software is used to optimize the stiffness parameter optimization results of each spring unit; The stiffness parameter optimization result is brought into the finite element model of the motor rotor assembly, and a modal simulation analysis is performed to obtain the modal vibration shape simulation result and the corresponding modal frequency simulation result of the finite element model of the motor rotor assembly.

9. The motor rotor modal simulation analysis method according to claim 1, characterized in that: The following steps are also included: The modal tests of the skewed pole segment and the motor rotor assembly were carried out respectively by the hammer method to obtain the measured modal vibration shapes and the corresponding measured modal frequencies of the skewed pole segment and the motor rotor assembly.

10. A storage medium having a computer program stored thereon, characterized in that: The computer program is executed by a processor to implement the motor rotor modal simulation analysis method as described in any one of claims 1 to 9.

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