Method and device for evaluating NVH (Noise Vibration and Harshness) performance of motor rotor and electronic equipment

Abstract

The invention provides an NVH performance evaluation method and device of a motor rotor and electronic equipment, and relates to the technical field of motors, the NVH performance evaluation method of the motor rotor comprises the steps that a rotor finite element model corresponding to the motor rotor is simulated to obtain a torsional mode data set, and the motor rotor uses a target skewed pole arrangement mode; simulating the two-dimensional electromagnetic model corresponding to the motor rotor to obtain a torque fluctuation data set; according to the torsional mode data set and the torque fluctuation data set, the coupling condition between the torsional mode of the motor rotor and the torque fluctuation of the motor rotor is determined, and a first coupling condition is obtained; and evaluating whether the motor rotor meets the NVH performance requirement or not according to the first coupling condition. According to the invention, the cost and time cost of motor development can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of motor technology, and in particular to a method, device and electronic equipment for evaluating the NVH performance of a motor rotor. Background Art

[0002] NVH (Noise, Vibration, and Harshness) refers to noise, vibration and roughness, and is a comprehensive indicator for evaluating the sound, vibration and discomfort generated by the motor system during operation. Permanent magnet synchronous motors generate periodic electromagnetic force waves, which can be decomposed into radial force waves and tangential force waves. The tangential force waves plus the tooth torque are coupled with the rotor torsional mode in the form of torque fluctuations, and are transmitted to the housing through the rotor bearing, thereby causing the motor NVH effect. At present, the motor rotor is usually divided into multiple sections with equal axial length and skewed poles arranged in a specific way. The skewed pole form is used to reduce the NVH effect of the motor. Different skewed pole arrangements (such as skewed pole angle, number of poles, etc.) will have different effects on the NVH performance of the motor.

[0003] In the related technology, the three-in-one finite element model of the electric drive assembly is simulated, the electromagnetic force at the stator teeth or the rotor is output, and applied to the stator teeth and the rotor respectively. The response at the suspension mounting point is evaluated to realize the NVH performance evaluation of the motor rotor. However, the three-in-one finite element model of the electric drive assembly can only be accurately built after the physical samples are produced in the later stage of the project. Therefore, the NVH performance of the rotor skew pole can only be evaluated in the later stage of the project. When the evaluation result is not ideal, it is necessary to readjust the skew pole arrangement of the rotor and re-produce the physical samples, which increases the cost and time cost of motor development. Summary of the invention

[0004] The problem solved by the present invention is how to reduce the expense and time cost of motor development.

[0005] In order to solve the above problems, the present invention provides a method, device and electronic equipment for evaluating the NVH performance of a motor rotor.

[0006] In a first aspect, the present invention provides a method for evaluating the NVH performance of a motor rotor, comprising:

[0007] Simulating a rotor finite element model corresponding to a motor rotor to obtain a torsional modal data set, wherein the motor rotor uses a target skew pole arrangement;

[0008] Simulating a two-dimensional electromagnetic model corresponding to the motor rotor to obtain a torque fluctuation data set;

[0009] Determine, according to the torsional mode data set and the torque fluctuation data set, a coupling condition between the torsional mode of the motor rotor and the torque fluctuation of the motor rotor to obtain a first coupling condition;

[0010] Evaluate whether the motor rotor meets NVH performance requirements based on the first coupling condition.

[0011] Optionally, determining a coupling condition between the torsional mode of the motor rotor and the torque fluctuation of the motor rotor according to the torsional mode data set and the torque fluctuation data set to obtain a first coupling condition includes:

[0012] Determine, according to the torsional mode vibration shape data and the torque fluctuation phase data, a coupling condition between the torsional mode vibration shape of the motor rotor and the torque fluctuation phase of the motor rotor to obtain a second coupling condition;

[0013] When the second coupling condition is uncoupled, determining the first coupling condition is uncoupled;

[0014] When the second coupling condition is coupling, whether the first coupling condition is coupling is determined based on the torque fluctuation amplitude data and the torsional modal frequency data, wherein the torsional modal data set includes the torsional modal vibration shape data and the torsional modal frequency data, and the torque fluctuation data set includes the torque fluctuation phase data and the torque fluctuation amplitude data.

[0015] Optionally, determining the coupling condition between the torsional mode shape of the motor rotor and the torque fluctuation phase of the motor rotor according to the torsional mode shape data and the torque fluctuation phase data to obtain the second coupling condition includes:

[0016] Determine whether a first torsional mode shape in the torsional mode shape data and a first torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a third coupling condition, wherein the first torsional mode shape is a torsional mode shape of the motor rotor under a first-order torsional mode, a rotor speed corresponding to the first-order torsional mode is a first speed, and the first torque fluctuation phase difference is a torque fluctuation phase difference of the motor rotor under the first speed;

[0017] determining whether a second torsional mode shape in the torsional mode shape data and a second torque fluctuation phase difference in the torque fluctuation phase data are coupled, to obtain a fourth coupling condition, wherein the second torsional mode shape is a torsional mode shape of the second rotor skew pole in a second-order torsional mode, a rotor speed corresponding to the second-order torsional mode is a second speed, and the second torque fluctuation phase difference is a torque fluctuation phase difference of the second rotor skew pole at the second speed;

[0018] It is determined whether the second coupling condition is coupling according to the third coupling condition and the fourth coupling condition.

[0019] Optionally, determining whether the second coupling condition is coupling according to the third coupling condition and the fourth coupling condition includes:

[0020] When both the third coupling condition and the fourth coupling condition are uncoupled, determining that the second coupling condition is uncoupled;

[0021] Otherwise, it is determined that the second coupling condition is coupling.

[0022] Optionally, determining whether the first torsional mode shape in the torsional mode shape data and the first torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a third coupling condition includes:

[0023] In the case where the vibration modes of the first torsional modes are opposite and the phase difference of the first torque fluctuation is greater than a preset value, determining that the third coupling condition is coupling; or,

[0024] When the first torsional mode vibration shapes are the same and the first torque fluctuation phase difference is smaller than a preset value, the third coupling condition is determined to be coupling.

[0025] Optionally, determining whether the second torsional mode shape in the torsional mode shape data and the second torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a fourth coupling condition comprises: when the second torsional mode shape is opposite and the second torque fluctuation phase difference is greater than a preset value, determining that the fourth coupling condition is coupling; or,

[0026] When the vibration modes of the second torsional modes are the same and the phase difference of the second torque fluctuation is smaller than a preset value, the fourth coupling condition is determined to be coupling.

[0027] Optionally, when the second coupling condition is coupling, determining whether the first coupling condition is coupling according to the torque fluctuation amplitude data and the torsional modal frequency data comprises:

[0028] In the case where the third coupling condition is coupling, the fourth coupling condition is non-coupling, and the first torque fluctuation amplitude in the torque fluctuation phase data is less than a first preset threshold, and the first torsional mode frequency in the torsional mode vibration shape data is greater than a second preset threshold, it is determined that the first coupling condition is non-coupling, wherein the first torsional mode frequency is the torsional mode frequency under the first-order torsional mode, and the first torque fluctuation amplitude is the torque fluctuation amplitude of the motor rotor at a first speed; and / or,

[0029] When the fourth coupling condition is coupled, the third coupling condition is uncoupled, and the second torque fluctuation amplitude in the torque fluctuation phase data is less than the third preset threshold, and the second torsional mode frequency in the torsional mode vibration shape data is greater than the fourth preset threshold, the first coupling condition is determined to be uncoupled, wherein the second torsional mode frequency is the torsional mode frequency under the second-order torsional mode, and the second torque fluctuation amplitude is the torque fluctuation amplitude of the second rotor skew pole at the second speed.

[0030] Optionally, evaluating whether the motor rotor meets the NVH performance requirement according to the first coupling condition includes: when the first coupling condition is coupled, determining that the motor rotor does not meet the NVH performance requirement.

[0031] Optionally, the NVH performance evaluation method of the motor rotor further includes: when the motor rotor does not meet the NVH performance requirement, adjusting the skew pole arrangement of the motor rotor until the adjusted motor rotor is evaluated to meet the NVH performance requirement.

[0032] In a second aspect, the present invention provides an NVH performance evaluation device for a motor rotor, comprising:

[0033] A first simulation module is used to simulate a rotor finite element model corresponding to a motor rotor to obtain a torsional modal data set, wherein the motor rotor uses a target skew pole arrangement;

[0034] A second simulation module is used to simulate a two-dimensional electromagnetic model corresponding to the motor rotor to obtain a torque fluctuation data set;

[0035] a determination module, configured to determine a coupling condition between the torsional mode of the motor rotor and the torque fluctuation of the motor rotor according to the torsional mode data set and the torque fluctuation data set, so as to obtain a first coupling condition;

[0036] An evaluation module is used to evaluate whether the motor rotor meets the NVH performance requirements according to the first coupling condition.

[0037] In a third aspect, the present invention provides an electronic device, including a memory and a processor;

[0038] The memory is used to store computer programs;

[0039] The processor is used to implement the NVH performance evaluation method of the motor rotor as described in the first aspect when executing the computer program.

[0040] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the NVH performance evaluation method of a motor rotor as described in the first aspect is implemented.

[0041] The beneficial effects of the NVH performance evaluation method, device and electronic equipment of the motor rotor of the present invention are as follows: by simulating the two-dimensional electromagnetic model and the rotor finite element model respectively, the torque modal data set and the torque fluctuation data set of the motor rotor are obtained, the coupling of the torque mode and the torque fluctuation is determined according to the torque modal data set and the torque fluctuation data set, and the NVH performance is evaluated according to the coupling of the mode and the torque fluctuation. Since the two-dimensional electromagnetic model and the rotor finite element model do not rely on physical samples when they are built, and compared with the interaction between the motor, the electronic control and the transmission system needs to be considered when building the three-in-one finite element model of the electric drive assembly, the rotor finite element model is smaller in scale. When building the rotor finite element model, only the structure and stress characteristics of the motor rotor part need to be considered, and the interaction between the motor, the electronic control and the transmission system does not need to be considered. It can be built in the early stage of project development. Therefore, the NVH performance of the motor rotor can be evaluated in the early stage of project development. Even if the evaluation result is not ideal and the oblique pole arrangement of the rotor needs to be adjusted, it is only necessary to modify the two-dimensional electromagnetic model and the rotor finite element model to evaluate again, and there is no need to re-produce physical samples, thereby reducing the cost and time cost of motor development. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic flow chart of a method for evaluating NVH performance of a motor rotor according to an embodiment of the present invention;

[0043] Figure 2 is a schematic diagram of an optional rotor skewed pole structure according to an embodiment of the present invention;

[0044] Figure 3 Schematic diagram of three sections of "I" shaped oblique poles according to an embodiment of the present invention;

[0045] Figure 4 Schematic diagram of six-segment "V"-shaped oblique poles according to an embodiment of the present invention;

[0046] Figure 5 A schematic diagram of an optional NVH performance evaluation process according to an embodiment of the present invention;

[0047] Figure 6 A schematic diagram of another optional flow chart for evaluating whether a motor rotor meets NVH performance requirements according to an embodiment of the present invention;

[0048] Figure 7 A schematic diagram of a process for determining a first coupling condition according to an embodiment of the present invention;

[0049] Figure 8 It is a structural schematic diagram of an NVH performance evaluation device for a motor rotor according to an embodiment of the present invention;

[0050] Fig. 9 The figure is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0052] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0053] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0054] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0055] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only used for illustrative purposes, and are not used to limit the scope of these messages or information.

[0056] In the related technology, a complete three-in-one finite element model of the electric drive assembly is built for simulation to evaluate the NVH performance of the rotor. The three-in-one finite element model of the electric drive assembly refers to a finite element model that integrates the motor, electronic control and transmission system for modeling. The accuracy of the three-in-one finite element model of the electric drive assembly depends on the calibration of the measured modes of each component in the assembly model. However, there are no physical samples in the early stage of project development, which cannot meet the needs of modal calibration. The calibration of the measured modes of each component can only be completed after the physical samples are produced in the later stage of the project, and then an accurate three-in-one finite element model of the electric drive assembly can be built. When the NVH performance is evaluated through the three-in-one finite element model of the electric drive assembly, if the evaluation result is not ideal, that is, the NVH performance does not meet the performance requirements, it is necessary to readjust the skewed pole arrangement of the designed rotor, re-produce the adjusted physical samples, and rebuild the complete three-in-one finite element model of the electric drive assembly, which increases the development cost and time cost.

[0057] In view of the problems existing in the above-mentioned related technologies, this embodiment provides a method, device and electronic equipment for evaluating the NVH performance of a motor rotor.

[0058] like Figure 1 As shown, an embodiment of the present invention provides a method for evaluating the NVH performance of a motor rotor, comprising:

[0059] S100, simulating a rotor finite element model corresponding to a motor rotor to obtain a torsional modal data set, wherein the motor rotor uses a target skew pole arrangement.

[0060] Specifically, when the skewed pole arrangement of the motor rotor is the target skewed pole arrangement, it is necessary to evaluate the NVH performance of the motor rotor to see whether it meets the NVH performance requirements to determine whether the skewed pole arrangement designed by the R&D personnel needs further adjustment.

[0061] The rotor finite element model of the motor rotor is a mathematical model of the rotor system established according to the structure of the motor rotor. By inputting the design parameters of the rotor and simulating the rotor finite element model, the torsional modal data of the rotor can be solved.

[0062] Compared with the three-in-one finite element model of the complete electric drive assembly, the finite element model of the rotor is smaller in scale, simpler to build, and does not require physical samples for modal calibration, so it can be built in the early stages of development.

[0063] The rotor is divided into a plurality of slanted pole segments of equal axial length. For example, Figure 2 As shown, the rotor is divided into three skewed pole segments (a first skewed pole segment, a second skewed pole segment, and a third skewed pole segment), and each skewed pole surface has a groove, such as Figure 2The grooves 1-3 in the structure are used to accommodate winding conductors, and the skew angle is usually the axial angle of the grooves on different skew segments.

[0064] like Figure 3 The rotor skew poles shown are three sections of straight-line skew poles, dividing the rotor into three skew pole sections, such as Figure 4 The rotor skew poles shown are six V-shaped skew poles, which divide the rotor into six skew pole segments, and each square represents a divided skew pole segment.

[0065] S200, simulating a two-dimensional electromagnetic model corresponding to the motor rotor to obtain a torque fluctuation data set.

[0066] Specifically, the two-dimensional electromagnetic model is a mathematical model that describes the electromagnetic characteristics of the rotor part. By applying sinusoidal current excitation and simulating and analyzing the two-dimensional electromagnetic model, the torque fluctuation data of the motor rotor with the speed change can be solved. Torque fluctuation refers to the periodic change or fluctuation phenomenon of the torque output by the motor rotor during operation.

[0067] The 2D electromagnetic model does not require physical samples for modal calibration and can be built in the early stages of development.

[0068] The construction of a two-dimensional electromagnetic model requires the collection of basic parameters and geometric parameters of the motor, and the two-dimensional electromagnetic model is built based on the basic parameters and geometric parameters. The basic parameters include the stator and rotor pole slot ratio, silicon steel grade, silicon steel BH curve, motor effective stack length, stacking coefficient, winding type, winding connection method, number of layers, number of parallel branches, magnetic steel grade, magnetic steel BH curve and other information; the geometric data includes the geometric models or drawings of the stator, rotor, winding and magnetic steel.

[0069] S300: Determine a coupling condition between the torsional mode of the motor rotor and the torque fluctuation of the motor rotor according to the torsional mode data set and the torque fluctuation data set to obtain a first coupling condition.

[0070] S400: Evaluate whether the motor rotor meets NVH performance requirements according to the first coupling condition.

[0071] Specifically, the principle of the motor generating NVH effect is the periodic electromagnetic force wave radial force wave and tangential force wave generated by the motor, among which the tangential force wave plus the tooth torque is coupled with the torsional mode of the rotor in the form of torque fluctuation, that is, the torque fluctuation is coupled with the torsional mode of the rotor, which in turn causes the motor to generate NVH effect, such as motor whistling. Therefore, it is possible to evaluate whether the motor rotor meets the NVH performance requirements by whether the torque fluctuation and torsional mode are coupled, that is, whether the skewed pole arrangement in the rotor is designed as the target skewed pole arrangement, whether the NVH effect can be reduced so that the motor will not whistle.

[0072] like Figure 5 As shown, first, a two-dimensional electromagnetic model is built according to the collected basic parameters and geometric data of the motor, and a sinusoidal current excitation is input to extract the torque fluctuation amplitude and torque fluctuation phase that change with the speed, that is, to extract the torque fluctuation data set; a finite element network model is built, and the structural parameters of the rotor skew pole are input. The structural parameters include the stiffness units corresponding to the adjacent rotor skew pole segments. The stiffness units describe the connection relationship between the adjacent rotor skew pole segments and are used to simulate and analyze the dynamic characteristics and vibration response of the rotor. The torsional modal data set is extracted from the output of the simulation model, and then the next step is performed according to the extracted torque fluctuation data set and torsional modal data set, that is, the NVH performance is evaluated.

[0073] In this embodiment, simulations are performed respectively on a two-dimensional electromagnetic model and a rotor finite element model to obtain a torque modal data set and a torque fluctuation data set of the motor rotor, and the coupling of the torque mode and the torque fluctuation is determined according to the torque modal data set and the torque fluctuation data set. The NVH performance is evaluated according to the coupling of the mode and the torque fluctuation. Since the two-dimensional electromagnetic model and the rotor finite element model do not rely on physical samples when they are built, compared with the interaction between the motor, the electronic control and the transmission system that needs to be considered when building a three-in-one finite element model of the electric drive assembly, the rotor finite element model is smaller in scale. The construction of the rotor finite element model only needs to consider the structure and stress characteristics of the motor rotor part, and does not need to consider the interaction between the motor, the electronic control and the transmission system. It can be built in the early stage of project development. Therefore, the NVH performance of the motor rotor can be evaluated in the early stage of project development. Even if the evaluation result is not ideal and the oblique pole arrangement of the rotor needs to be adjusted, it is only necessary to modify the two-dimensional electromagnetic model and the rotor finite element model to evaluate again, and there is no need to re-produce physical samples, thereby reducing the cost and time cost of motor development.

[0074] Optionally, evaluating whether the motor rotor meets the NVH performance requirement according to the first coupling condition includes: when the first coupling condition is coupled, determining that the motor rotor does not meet the NVH performance requirement.

[0075] Specifically, Figure 6As shown, by simulating the two-dimensional electromagnetic model and the rotor finite element model respectively, the torque modal data set and the torque fluctuation data set of the motor rotor are obtained, and the first coupling situation is determined based on the torque modal data set and the torque fluctuation data set. The first coupling situation indicates whether the torque fluctuation and the torsional mode are coupled. The first coupling situation is coupled, and the torque fluctuation and the torsional mode are coupled, which means that the torque fluctuation will affect the torsional vibration mode of the rotor, causing a greater risk of the motor howling. Therefore, the motor rotor does not meet the NVH performance requirements. On the contrary, when the first coupling situation is uncoupled, that is, when the torque fluctuation and the torsional mode are not coupled, the risk of causing the motor to howl is very small. Therefore, the motor rotor meets the NVH performance requirements.

[0076] In this embodiment, whether the motor rotor meets the NVH performance requirements is determined by determining whether the torque fluctuation and the torsional mode are coupled, and thus the skewed pole arrangement of the motor rotor can be determined.

[0077] Optionally, determining the coupling condition between the torsional mode of the motor rotor and the torque fluctuation of the motor rotor according to the torsional modal data set and the torque fluctuation data set to obtain a first coupling condition includes: determining the coupling condition between the torsional modal vibration shape of the motor rotor and the torque fluctuation phase of the motor rotor according to the torsional modal vibration shape data and the torque fluctuation phase data to obtain a second coupling condition; when the second coupling condition is uncoupled, determining the first coupling condition to be uncoupled; when the second coupling condition is coupled, determining whether the first coupling condition is coupled according to the torque fluctuation amplitude data and the torsional modal frequency data, wherein the torsional modal data set includes the torsional modal vibration shape data and the torsional modal frequency data, and the torque fluctuation data set includes the torque fluctuation phase data and the torque fluctuation amplitude data.

[0078] Specifically, the torsional modal data set obtained by simulating the rotor finite element model includes torsional modal frequency data and torsional modal vibration shape data. The motor rotor has multiple torsional modes in rotational motion. Different torsional modes correspond to different torsional modal frequencies and torsional modal vibration shapes. The torsional modal frequency data includes torsional modal frequencies corresponding to multiple torsional modes, and the torsional modal vibration shape data includes torsional modal vibration shapes corresponding to multiple torsional modes. Rotor torque fluctuation refers to the periodic change of torque on the rotor shaft during rotational motion. The torque fluctuation data set obtained by simulating the two-dimensional electromagnetic model includes torque fluctuation amplitude data and torque fluctuation phase data.

[0079] When judging whether the torque mode and torque fluctuation are coupled, firstly, it is judged whether the torque modal vibration type and the torque fluctuation phase are coupled, that is, whether the second coupling situation is coupled, wherein whether the torque modal vibration type and the torque fluctuation phase are coupled is determined according to the torsional modal vibration type data and the torque fluctuation phase data; secondly, the first coupling situation is further determined according to the second coupling situation, and when the second coupling situation is uncoupled, it can be directly determined that the first coupling situation is uncoupled, that is, the torque mode and the torque fluctuation are uncoupled when the torque modal vibration type and the torque fluctuation phase are uncoupled; when the second coupling situation is coupled, it does not directly indicate that the first coupling situation is coupled, that is, the torque mode and the torque fluctuation are not necessarily coupled when the torque modal vibration type and the torque fluctuation phase are coupled, and it needs to be further determined in combination with the torsional modal frequency data and the torque fluctuation amplitude data.

[0080] Optionally, determining the coupling condition between the torsional mode vibration shape of the motor rotor and the torque fluctuation phase of the motor rotor according to the torsional mode vibration shape data and the torque fluctuation phase data to obtain the second coupling condition includes: determining whether a first torsional mode vibration shape in the torsional mode vibration shape data and a first torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a third coupling condition, wherein the first torsional mode vibration shape is the torsional mode vibration shape of the motor rotor under a first-order torsional mode, the rotor speed corresponding to the first-order torsional mode is a first speed, and the first torque fluctuation phase difference is the torque fluctuation phase difference of the motor rotor under the first speed;

[0081] determining whether a second torsional mode shape in the torsional mode shape data and a second torque fluctuation phase difference in the torque fluctuation phase data are coupled, to obtain a fourth coupling condition, wherein the second torsional mode shape is a torsional mode shape of the second rotor skew pole in a second-order torsional mode, a rotor speed corresponding to the second-order torsional mode is a second speed, and the second torque fluctuation phase difference is a torque fluctuation phase difference of the second rotor skew pole at the second speed;

[0082] It is determined whether the second coupling condition is coupling according to the third coupling condition and the fourth coupling condition.

[0083] Specifically, to determine whether the torque modal vibration type and the torque fluctuation phase are coupled (whether the second coupling situation is coupling), it is necessary to judge separately from different torsional modes. The rotor generally corresponds to multiple different torsional modes. Among them, the motor is most likely to whine in the first-order mode and the second-order mode. Therefore, it is chosen to judge whether the modal vibration type and the torque fluctuation phase are coupled from the first-order mode and the second-order mode.

[0084] The torsional modal vibration type data at least include the torsional modal vibration type corresponding to the rotor under the first-order mode and the torsional modal vibration type corresponding to the rotor under the second-order mode, and the torsional modal frequency data at least include the torsional modal frequency corresponding to the first-order mode and the torsional modal frequency corresponding to the second-order mode; under the first-order mode, the rotational speed of the motor rotor is a first speed, and under the second-order mode, the rotational speed of the motor rotor is a second speed, and the torque fluctuation data set records the torque fluctuation phase difference and torque fluctuation amplitude of the motor rotor at different speeds, that is, the torque fluctuation phase data at least include the torque fluctuation phase difference corresponding to the first speed and the torque fluctuation phase difference corresponding to the second speed, and the torque fluctuation amplitude data at least include the torque fluctuation amplitude corresponding to the first speed and the torque fluctuation amplitude corresponding to the second speed.

[0085] In the first-order mode, the torsional modal vibration mode of the motor rotor is the first torsional modal vibration mode, and the torque fluctuation phase difference of the motor rotor is the first torque fluctuation phase difference. Whether the torque modal vibration mode and the torque fluctuation phase are coupled in the first-order mode is equivalent to whether the first torsional modal vibration mode and the first torque fluctuation phase difference are coupled (i.e., the third coupling situation); in the second-order mode, the torsional modal vibration mode of the motor rotor is the second torsional modal vibration mode, and the torque fluctuation phase difference of the motor rotor is the second torque fluctuation phase difference. Whether the torque modal vibration mode and the torque fluctuation phase are coupled in the second-order mode is equivalent to whether the second torsional modal vibration mode and the second torque fluctuation phase difference are coupled (i.e., the fourth coupling situation).

[0086] The coupling conditions of the torque modal vibration shape and the torque fluctuation phase in the first-order mode and the second-order mode are determined respectively, that is, the third coupling condition and the fourth coupling condition are obtained. Combining the third coupling condition and the fourth coupling condition, it can be comprehensively judged whether the torque modal vibration shape and the torque fluctuation phase are coupled as a whole, that is, the second coupling condition is determined.

[0087] Optionally, determining whether the first torsional mode vibration mode in the torsional mode vibration mode data and the first torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a third coupling condition includes: when the first torsional mode vibration modes are opposite and the first torque fluctuation phase difference is greater than a preset value, determining that the third coupling condition is coupling; or, when the first torsional mode vibration modes are the same and the first torque fluctuation phase difference is less than a preset value, determining that the third coupling condition is coupling.

[0088] The determining whether the second torsional mode vibration mode in the torsional mode vibration mode data and the second torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a fourth coupling condition includes: when the second torsional mode vibration modes are opposite and the second torque fluctuation phase difference is greater than a preset value, determining that the fourth coupling condition is coupling; or, when the second torsional mode vibration modes are the same and the second torque fluctuation phase difference is less than a preset value, determining that the fourth coupling condition is coupling.

[0089] Specifically, the first-order mode has one vibration node, and the second-order mode has two vibration nodes, that is, in this mode, there are two positions or nodes in the system whose vibration amplitude is zero. Figure 3 In the three sections of straight-line poles shown, the first-order mode is that the first and third pole sections vibrate with the second pole section as a node, and the second pole section does not vibrate. The second-order mode is that the first pole section and the second pole section vibrate as a group, and the vibration node is the connection between the first pole section and the second pole section, and the second pole section and the third pole section vibrate as a group, and the vibration node is the connection between the second pole section and the third pole section; as shown in FIG. Figure 4 Among the six V-shaped poles shown, the first-order mode is that the first pole segment and the sixth pole segment are a group of vibrations, with the second to fifth pole segments as node vibrations, and the second to fifth pole segments have no vibrations; the second-order mode is that the first pole segment and the third pole segment are a group of vibrations, and the vibration node is the second pole segment, and the second pole segment has no vibration; the fourth pole segment and the sixth pole segment are a group of vibrations, and the vibration node is the fifth pole segment, and the fifth pole segment has no vibrations.

[0090] The opposite vibration modes of the torsional mode refer to the opposite vibration directions of the oblique pole segments of the vibration nodes respectively adjacent to each other, and the same vibration modes of the torsional mode refer to the same vibration directions of the oblique pole segments of the vibration nodes respectively adjacent to each other. For example, Figure 3 In the three-segment in-line inclined pole shown, the torsional modal vibration type of the first-order mode is determined by the direction of the first inclined pole segment and the vibration direction of the third inclined pole segment. The direction of the first inclined pole segment and the vibration direction of the third inclined pole segment are opposite, that is, the first torsional modal vibration type is opposite, and the direction of the first inclined pole segment and the vibration direction of the third inclined pole segment are the same, that is, the first torsional modal vibration type is the same.

[0091] The torque fluctuation phase difference refers to the difference in the torque fluctuation phase between two adjacent oblique pole segments of the vibration node. For example, Figure 3 Among the three sections of in-line inclined poles shown, when simulating the two-dimensional electromagnetic model, the torque fluctuation phase of the first inclined pole section and the torque fluctuation phase of the third inclined pole section at the first speed are extracted, and the torque fluctuation phase of the first inclined pole section and the torque fluctuation phase of the third inclined pole section at the first speed are subtracted to obtain the first torque fluctuation phase difference.

[0092] When one of the following is satisfied, the first torsional mode shape and the first torque fluctuation phase difference are coupled, that is, the third coupling situation is coupled:

[0093] Case 1: The vibration mode of the first torsional mode is opposite, and the phase difference of the first torque fluctuation is greater than the preset value;

[0094] Case 2: The vibration modes of the first torsional modes are the same, and the first torque fluctuation phase difference is less than or equal to a preset value.

[0095] The preset value is pre-set, and may specifically be 90 degrees.

[0096] Similarly, when one of the following conditions is met, the second torsional mode shape and the second torque fluctuation phase difference are coupled, that is, the fourth coupling condition is coupled:

[0097] Case 1: The vibration mode of the second torsional mode is opposite, and the second torque fluctuation phase difference is greater than the preset value;

[0098] Case 2: The vibration modes of the second torsional modes are the same, and the second torque fluctuation phase difference is less than or equal to a preset value.

[0099] Optionally, determining whether the second coupling condition is coupled according to the third coupling condition and the fourth coupling condition includes: when the third coupling condition and the fourth coupling condition are both uncoupled, determining that the second coupling condition is uncoupled; otherwise, determining that the second coupling condition is coupled.

[0100] Specifically, the overall uncoupling of the torque modal vibration shape and the torque fluctuation phase requires that the torque modal vibration shape and the torque fluctuation phase are uncoupled in the first-order mode and the second-order mode, that is, the second coupling situation is determined to be uncoupled only when the third coupling situation and the fourth coupling situation are both uncoupled, and the second coupling situation is coupled when at least one of the third coupling situation and the fourth coupling situation is coupled.

[0101] Optionally, when the second coupling condition is coupling, determining whether the first coupling condition is coupling according to the torque fluctuation amplitude data and the torsional modal frequency data comprises:

[0102] In the case where the third coupling condition is coupling, the fourth coupling condition is non-coupling, and the first torque fluctuation amplitude in the torque fluctuation phase data is less than a first preset threshold, and the first torsional mode frequency in the torsional mode vibration shape data is greater than a second preset threshold, it is determined that the first coupling condition is non-coupling, wherein the first torsional mode frequency is the torsional mode frequency under the first-order torsional mode, and the first torque fluctuation amplitude is the torque fluctuation amplitude of the motor rotor at a first speed; and / or,

[0103] When the fourth coupling condition is coupling, the third coupling condition is non-coupling, and the second torque fluctuation amplitude in the torque fluctuation phase data is less than the third preset threshold, and the second torsional mode frequency in the torsional mode vibration shape data is greater than the fourth preset threshold, it is determined that the first coupling condition is non-coupling, wherein the second torsional mode frequency is the torsional mode frequency under the second-order torsional mode, and the second torque fluctuation amplitude is the torque fluctuation amplitude of the second rotor skew pole at the second speed;

[0104] When the fourth coupling condition and the third coupling condition are both coupling, and the second torque fluctuation amplitude is less than the third preset threshold, and the second torsional mode frequency is greater than the fourth preset threshold, and the first torque fluctuation amplitude is less than the first preset threshold, and the first torsional mode frequency is greater than the second preset threshold, it is determined that the first coupling condition is uncoupling;

[0105] Otherwise, it is determined that the first coupling condition is coupling.

[0106] Specifically, the second coupling situation is coupling and is divided into three situations, namely, the third coupling situation is coupling but the fourth coupling situation is not coupling, the fourth coupling situation is coupling but the third coupling situation is not coupling, and the third coupling situation and the fourth coupling situation are both coupling.

[0107] When the third coupling situation is coupled but the fourth coupling situation is uncoupled, if the torque fluctuation level is low and the torsional modal frequency is high, the first coupling situation can be determined to be uncoupled, that is, the first torque fluctuation amplitude is less than the first preset threshold and the first torsional modal frequency is greater than the second preset threshold, and the first coupling situation is determined to be uncoupled; when the fourth coupling situation is coupled but the third coupling situation is uncoupled, if the torque fluctuation level is low and the torsional modal frequency is high, the first coupling situation can be determined to be uncoupled, that is, the second torque fluctuation amplitude is less than the third preset threshold and the second torsional modal frequency is greater than the fourth preset threshold, and the first coupling situation can be determined to be coupled; the third coupling situation and the fourth coupling situation are both coupled, if the torque fluctuation level is low and the torsional modal frequency is high, the first coupling situation can be determined to be uncoupled, that is, the first torque fluctuation amplitude is less than the first preset threshold and the first torsional modal frequency is greater than the second preset threshold, and the second torque fluctuation amplitude is less than the third preset threshold and the second torsional modal frequency is greater than the fourth preset threshold, and the first coupling situation can be determined to be uncoupled.

[0108] It should be noted that the first preset threshold and the third preset threshold may be equal or different, and the second preset threshold and the fourth preset threshold may be equal or different.

[0109] like Figure 7 As shown, determining the first coupling condition according to the third coupling condition and the fourth coupling condition includes:

[0110] S701, determining whether the third coupling condition is coupling, and if the third coupling condition is coupling, executing S702, and if the third coupling condition is not coupling, executing S704;

[0111] S702, determining whether a first preset condition is satisfied, if the first preset condition is not satisfied, executing S703, if the first preset condition is satisfied, executing S704, wherein the first preset condition is: the first torque fluctuation amplitude is less than a first preset threshold value and the first torsional modal frequency is greater than a second preset threshold value;

[0112] S703, determining that the first coupling condition is coupling;

[0113] S704, determining whether the fourth coupling condition is coupling, and if the fourth coupling condition is coupling, executing S705, and if the third coupling condition is not coupling, executing S707,

[0114] S705, determining whether a second preset condition is satisfied, and if the second preset condition is not satisfied, executing S706, and if the first preset condition is satisfied, executing S707, wherein the second preset condition is: the second torque fluctuation amplitude is less than a third preset threshold value and the second torsional modal frequency is greater than a fourth preset threshold value;

[0115] S706, determining that the first coupling condition is coupling;

[0116] S707: Determine that the first coupling condition is uncoupling.

[0117] Optionally, the torsional mode data set includes at least torsional mode vibration shapes and torsional mode frequencies corresponding to the first-order torsional mode and the second-order torsional mode of the motor rotor, respectively; the torque fluctuation data set includes at least torque fluctuation amplitudes and torsional fluctuation phases corresponding to the first-order torsional mode and the second-order torsional mode of the motor rotor, respectively; when the torsional mode data set and the torque fluctuation data set satisfy at least one of the following conditions, the torsional mode of the motor rotor and the torque fluctuation of the motor rotor are coupled, that is, the first coupling condition is coupling:

[0118] 1. Under the first-order torsional mode of the motor rotor, the corresponding torsional mode vibration shape is coupled with the torsional fluctuation phase, and the corresponding torque fluctuation amplitude and torque modal frequency do not meet the above-mentioned first preset condition;

[0119] 2. Under the second-order torsional mode of the motor rotor, the corresponding torsional mode vibration shape is coupled with the torsional fluctuation phase, and the corresponding torque fluctuation amplitude and torque modal frequency do not meet the above second preset condition.

[0120] Among them, the first preset condition is that under the first-order torsional mode, the corresponding torsional fluctuation amplitude is less than the first preset value and the torsional modal frequency is greater than the second preset value, and the second preset condition is that under the first-order torsional mode, the corresponding torsional fluctuation amplitude is less than the third preset value and the torsional modal frequency is greater than the fourth preset value.

[0121] Optionally, the NVH performance evaluation method of the motor rotor further includes: when the motor rotor does not meet the NVH performance requirement, adjusting the skew pole arrangement of the motor rotor until the adjusted motor rotor is evaluated to meet the NVH performance requirement.

[0122] Specifically, after evaluating that the motor rotor does not meet the NVH performance requirements, the pole tilt arrangement method can be changed or the pole tilt angle can be adjusted, and the above-mentioned evaluation method can be used to evaluate whether the adjusted rotor meets the NVH performance requirements until it is determined that the motor rotor meets the NVH performance requirements, that is, the currently used pole tilt method corresponds to a low risk of motor howling.

[0123] like Figure 8 As shown, an NVH performance evaluation device 800 for a motor rotor provided by an embodiment of the present invention includes:

[0124] A first simulation module 810 is used to simulate a rotor finite element model corresponding to a motor rotor to obtain a torsional modal data set, wherein the motor rotor uses a target skew pole arrangement;

[0125] A second simulation module 820 is used to simulate a two-dimensional electromagnetic model corresponding to the motor rotor to obtain a torque fluctuation data set;

[0126] A determination module 830 is used to determine a coupling condition between the torsional mode of the motor rotor and the torque fluctuation of the motor rotor according to the torsional mode data set and the torque fluctuation data set to obtain a first coupling condition;

[0127] The evaluation module 840 is used to evaluate whether the motor rotor meets the NVH performance requirements according to the first coupling condition.

[0128] The NVH performance evaluation device for the motor rotor of this embodiment is used to implement the NVH performance evaluation method for the motor rotor as described above. Its advantages over the prior art are the same as the advantages of the NVH performance evaluation method for the motor rotor as described above over the prior art, and will not be repeated here.

[0129] Optionally, the above-mentioned determination module 830 is specifically used to determine the coupling condition between the torsional mode of the motor rotor and the torque fluctuation of the motor rotor according to the torsional mode data set and the torque fluctuation data set in the following manner to obtain a first coupling condition: determine the coupling condition between the torsional mode vibration shape of the motor rotor and the torque fluctuation phase of the motor rotor according to the torsional mode vibration shape data and the torque fluctuation phase data to obtain a second coupling condition; when the second coupling condition is uncoupled, determine that the first coupling condition is uncoupled; when the second coupling condition is coupled, determine whether the first coupling condition is coupled according to the torque fluctuation amplitude data and the torsional mode frequency data, wherein the torsional mode data set includes the torsional mode vibration shape data and the torsional mode frequency data, and the torque fluctuation data set includes the torque fluctuation phase data and the torque fluctuation amplitude data.

[0130] Optionally, the determination module 830 is specifically used to determine the coupling condition between the torsional mode vibration shape of the motor rotor and the torque fluctuation phase of the motor rotor according to the torsional mode vibration shape data and the torque fluctuation phase data in the following manner to obtain a second coupling condition: determine whether a first torsional mode vibration shape in the torsional mode vibration shape data and a first torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a third coupling condition, wherein the first torsional mode vibration shape is the torsional mode vibration shape of the motor rotor under a first-order torsional mode, the rotor speed corresponding to the first-order torsional mode is a first speed, and the first torque fluctuation phase difference is a first speed. The dynamic phase difference is the torque fluctuation phase difference of the motor rotor at the first speed; determine whether the second torsional mode vibration mode in the torsional mode vibration mode data and the second torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a fourth coupling situation, wherein the second torsional mode vibration mode is the torsional mode vibration mode of the second rotor oblique pole in the second-order torsional mode, the rotor speed corresponding to the second-order torsional mode is the second speed, and the second torque fluctuation phase difference is the torque fluctuation phase difference of the second rotor oblique pole at the second speed; determine whether the second coupling situation is coupled according to the third coupling situation and the fourth coupling situation.

[0131] Optionally, the above-mentioned determination module 830 is specifically used to determine whether the second coupling situation is coupled according to the third coupling situation and the fourth coupling situation in the following manner: when the third coupling situation and the fourth coupling situation are both uncoupled, determine that the second coupling situation is uncoupled; otherwise, determine that the second coupling situation is coupled.

[0132] Optionally, the above-mentioned determination module 830 is specifically used to determine whether the first torsional mode vibration mode in the torsional mode vibration mode data and the first torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a third coupling situation in the following manner: when the first torsional mode vibration modes are opposite and the first torque fluctuation phase difference is greater than a preset value, the third coupling situation is determined to be coupling; or, when the first torsional mode vibration modes are the same and the first torque fluctuation phase difference is less than a preset value, the third coupling situation is determined to be coupling.

[0133] Optionally, the determination module 830 is specifically used to determine whether the second torsional mode vibration mode in the torsional mode vibration mode data and the second torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a fourth coupling condition in the following manner: when the second torsional mode vibration modes are opposite and the second torque fluctuation phase difference is greater than a preset value, the fourth coupling condition is determined to be coupling; or, when the second torsional mode vibration modes are the same and the second torque fluctuation phase difference is less than a preset value, the fourth coupling condition is determined to be coupling.

[0134] Optionally, when the second coupling condition is coupling, the determination module 830 is specifically used to determine whether the first coupling condition is coupling according to the torque fluctuation amplitude data and the torsional modal frequency data in the following manner: when the third coupling condition is coupling, the fourth coupling condition is uncoupling, and the first torque fluctuation amplitude in the torque fluctuation phase data is less than a first preset threshold, and the first torsional modal frequency in the torsional modal vibration shape data is greater than a second preset threshold, the first coupling condition is determined to be uncoupling, wherein the first torsional modal frequency is the torsional modal frequency under the first-order torsional mode, and the first torque fluctuation amplitude is the torque fluctuation amplitude of the motor rotor at the first speed; when the fourth coupling condition is coupling, the third coupling condition is uncoupling, and the second torque fluctuation amplitude in the torque fluctuation phase data is less than the third preset threshold, and the second torsional modal frequency in the torsional modal vibration shape data is greater than the fourth preset threshold, the first coupling condition is determined to be uncoupling, wherein the second torsional modal frequency is the torsional modal frequency under the second-order torsional mode, and the second torque fluctuation amplitude is the torque fluctuation amplitude of the second rotor skew pole at the second speed.

[0135] Optionally, the evaluation module 840 is specifically used to evaluate whether the motor rotor meets the NVH performance requirement according to the first coupling condition in the following manner:

[0136] When the first coupling condition is coupling, it is determined that the motor rotor does not meet the NVH performance requirement.

[0137] Optionally, the NVH performance evaluation device 800 of the motor rotor is also used to adjust the skew pole arrangement of the motor rotor when the motor rotor does not meet the NVH performance requirements, until the adjusted motor rotor is evaluated to meet the NVH performance requirements.

[0138] like Fig. 9 As shown, an electronic device 900 provided by an embodiment of the present invention includes a memory 910 and a processor 920; the memory 910 is used to store a computer program; the processor 920 is used to implement the NVH performance evaluation method of the motor rotor as described above when executing the computer program.

[0139] In other words, an electronic device 900 includes a memory 910 and a processor 920 coupled to the memory 910; the memory 910 is configured to store a computer program; and the processor 920 is configured to perform the following operations when executing the computer program:

[0140] Simulating a rotor finite element model corresponding to a motor rotor to obtain a torsional modal data set, wherein the motor rotor uses a target skew pole arrangement;

[0141] Simulating a two-dimensional electromagnetic model corresponding to the motor rotor to obtain a torque fluctuation data set;

[0142] Determine, according to the torsional mode data set and the torque fluctuation data set, a coupling condition between the torsional mode of the motor rotor and the torque fluctuation of the motor rotor to obtain a first coupling condition;

[0143] Evaluate whether the motor rotor meets NVH performance requirements based on the first coupling condition.

[0144] An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the NVH performance evaluation method of a motor rotor as described above is implemented.

[0145] In other words, a non-volatile computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor performs the following operations:

[0146] Simulating a rotor finite element model corresponding to a motor rotor to obtain a torsional modal data set, wherein the motor rotor uses a target skew pole arrangement;

[0147] Simulating a two-dimensional electromagnetic model corresponding to the motor rotor to obtain a torque fluctuation data set;

[0148] Determine, according to the torsional mode data set and the torque fluctuation data set, a coupling condition between the torsional mode of the motor rotor and the torque fluctuation of the motor rotor to obtain a first coupling condition;

[0149] Evaluate whether the motor rotor meets NVH performance requirements based on the first coupling condition.

[0150] An electronic device 900 that can be used as a server or client of the present invention will now be described, which is an example of a hardware device that can be applied to various aspects of the present invention. Electronic device 900 is intended to represent various forms of digital electronic computer equipment, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic device 900 can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples, and are not intended to limit the implementation of the present invention described herein and / or required.

[0151] Electronic device 900 includes a computing unit, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) or a computer program loaded from a storage unit into a random access memory (RAM). In RAM, various programs and data required for device operation can also be stored. The computing unit, ROM, and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0152] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc. In the present application, the unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment of the present invention. In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0153] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A method for evaluating the NVH performance of a motor rotor, characterized in that: include: Simulating a rotor finite element model corresponding to a motor rotor to obtain a torsional modal data set, wherein the motor rotor uses a target skew pole arrangement; Simulating a two-dimensional electromagnetic model corresponding to the motor rotor to obtain a torque fluctuation data set; Determine, according to the torsional mode data set and the torque fluctuation data set, a coupling condition between the torsional mode of the motor rotor and the torque fluctuation of the motor rotor to obtain a first coupling condition; Evaluate whether the motor rotor meets NVH performance requirements based on the first coupling condition.

2. The NVH performance evaluation method of a motor rotor according to claim 1, characterized in that: The step of determining a coupling condition between the torsional mode of the motor rotor and the torque fluctuation of the motor rotor according to the torsional mode data set and the torque fluctuation data set to obtain a first coupling condition includes: Determine, according to the torsional mode vibration shape data and the torque fluctuation phase data, a coupling condition between the torsional mode vibration shape of the motor rotor and the torque fluctuation phase of the motor rotor to obtain a second coupling condition; When the second coupling condition is uncoupled, determining the first coupling condition is uncoupled; When the second coupling condition is coupling, whether the first coupling condition is coupling is determined based on the torque fluctuation amplitude data and the torsional modal frequency data, wherein the torsional modal data set includes the torsional modal vibration shape data and the torsional modal frequency data, and the torque fluctuation data set includes the torque fluctuation phase data and the torque fluctuation amplitude data.

3. The NVH performance evaluation method of a motor rotor according to claim 2, characterized in that: The step of determining the coupling condition between the torsional mode shape of the motor rotor and the torque fluctuation phase of the motor rotor according to the torsional mode shape data and the torque fluctuation phase data to obtain a second coupling condition includes: determining whether a first torsional mode shape in the torsional mode shape data and a first torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a third coupling condition, wherein the first torsional mode shape is a torsional mode shape of the motor rotor under a first-order torsional mode, a rotor speed corresponding to the first-order torsional mode is a first speed, and the first torque fluctuation phase difference is a torque fluctuation phase difference of the motor rotor under the first speed; determining whether a second torsional mode shape in the torsional mode shape data and a second torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a fourth coupling condition, wherein the second torsional mode shape is a torsional mode shape of the motor rotor in a second-order torsional mode, a rotor speed corresponding to the second-order torsional mode is a second speed, and the second torque fluctuation phase difference is a torque fluctuation phase difference of the motor rotor at the second speed; It is determined whether the second coupling condition is coupling according to the third coupling condition and the fourth coupling condition.

4. The NVH performance evaluation method of a motor rotor according to claim 3, characterized in that: Determining whether the second coupling condition is coupling according to the third coupling condition and the fourth coupling condition includes: When both the third coupling condition and the fourth coupling condition are uncoupled, determining that the second coupling condition is uncoupled; Otherwise, it is determined that the second coupling condition is coupling.

5. The NVH performance evaluation method of a motor rotor according to claim 3, characterized in that: The determining whether the first torsional mode shape in the torsional mode shape data and the first torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a third coupling condition comprises: when the first torsional mode shapes are opposite and the first torque fluctuation phase difference is greater than a preset value, determining that the third coupling condition is coupling; or, When the vibration modes of the first torsional modes are the same and the phase difference of the first torque fluctuation is less than a preset value, determining that the third coupling condition is coupling; The determining whether the second torsional mode vibration shape in the torsional mode vibration shape data and the second torque fluctuation phase difference in the torque fluctuation phase data are coupled to obtain a fourth coupling condition comprises: when the second torsional mode vibration shapes are opposite and the second torque fluctuation phase difference is greater than a preset value, determining that the fourth coupling condition is coupling; or, When the vibration modes of the second torsional modes are the same and the phase difference of the second torque fluctuation is smaller than a preset value, the fourth coupling condition is determined to be coupling.

6. The NVH performance evaluation method of a motor rotor according to claim 3, characterized in that: In the case where the second coupling condition is coupling, determining whether the first coupling condition is coupling according to the torque fluctuation amplitude data and the torsional modal frequency data comprises: In the case where the third coupling condition is coupling, the fourth coupling condition is non-coupling, and the first torque fluctuation amplitude in the torque fluctuation phase data is less than a first preset threshold, and the first torsional mode frequency in the torsional mode vibration shape data is greater than a second preset threshold, it is determined that the first coupling condition is non-coupling, wherein the first torsional mode frequency is the torsional mode frequency under the first-order torsional mode, and the first torque fluctuation amplitude is the torque fluctuation amplitude of the motor rotor at a first speed; When the fourth coupling condition is coupling, the third coupling condition is uncoupling and the second torque fluctuation amplitude in the torque fluctuation phase data is less than the third preset threshold, and the second torsional mode frequency in the torsional mode vibration shape data is greater than the fourth preset threshold, it is determined that the first coupling condition is uncoupling, wherein the second torsional mode frequency is the torsional mode frequency under the second-order torsional mode, and the second torque fluctuation amplitude is the torque fluctuation amplitude of the motor rotor at the second speed.

7. The NVH performance evaluation method of a motor rotor according to claim 1, characterized in that: The step of evaluating whether the motor rotor meets the NVH performance requirement according to the first coupling condition includes: When the first coupling condition is coupling, it is determined that the motor rotor does not meet the NVH performance requirement.

8. The NVH performance evaluation method of a motor rotor according to claim 1, characterized in that: The NVH performance evaluation method of the motor rotor also includes: When the motor rotor does not meet the NVH performance requirement, the skewed pole arrangement of the motor rotor is adjusted until it is evaluated that the adjusted motor rotor meets the NVH performance requirement.

9. A device for evaluating the NVH performance of a motor rotor, characterized in that: include: A first simulation module is used to simulate a rotor finite element model corresponding to a motor rotor to obtain a torsional modal data set, wherein the motor rotor uses a target skew pole arrangement; A second simulation module is used to simulate a two-dimensional electromagnetic model corresponding to the motor rotor to obtain a torque fluctuation data set; a determination module, configured to determine a coupling condition between the torsional mode of the motor rotor and the torque fluctuation of the motor rotor according to the torsional mode data set and the torque fluctuation data set, so as to obtain a first coupling condition; An evaluation module is used to evaluate whether the motor rotor meets the NVH performance requirements according to the first coupling condition.

10. An electronic device, characterized in that: including memory and processor; The memory is used to store computer programs; The processor is used to implement the NVH performance evaluation method of the motor rotor as described in any one of claims 1 to 8 when executing the computer program.

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