Dynamic balance adjusting method and device for electric drive system

Abstract

The invention provides an electric drive system dynamic balance adjusting method and device. The method comprises the steps that the allowable residual unbalance amount of a motor rotor is acquired; measuring the first unbalance of the left and right end faces of the de-weighted motor rotor; when it is judged that the residual unbalance of the motor rotor meets a preset requirement based on the first unbalance and the allowable residual unbalance, second unbalance of the left and right end faces of the input shaft is measured; based on the first unbalance amount and the second unbalance amount, respectively calculating a first unbalance resultant vector and a second unbalance resultant vector of the unbalance amounts of the left and right end faces of the motor rotor and the input shaft; then, based on the two unbalanced resultant vectors, the assembly angles of the motor rotor and the input shaft are determined; and assembling the motor rotor and the input shaft based on the assembling angle. Therefore, the method and the device can adjust the assembly phase angle between the motor rotor and the input shaft, are favorable for improving the dynamic balance of an electric drive system, and are of great help for solving the roar problem in a vehicle.

Description

Technical Field

[0001] The present application relates to the technical field of electric drive systems, and more particularly, to a method and device for adjusting the dynamic balance of an electric drive system. Background Art

[0002] In the field of electric vehicles, the problem of in-vehicle noise caused by dynamic imbalance of the electric drive system has become increasingly prominent, becoming a key factor affecting driving comfort and vehicle quality. The formation reasons of dynamic imbalance are complex and diverse, covering aspects such as design defects, material flaws, insufficient machining accuracy, and assembly errors. To address this problem, existing technologies usually perform dynamic balance correction on the motor rotor, achieving the dynamic balance standard by precisely adjusting the mass distribution of the rotor. However, in practice, it is found that even if the motor rotor itself meets the dynamic balance standard, after being assembled into the whole vehicle, noise may still be generated due to the randomness of the assembly phase angle between the motor rotor and the input shaft. This phase mismatch caused by random assembly will further exacerbate the dynamic imbalance of the electric drive system, thereby causing in-vehicle noise. Summary of the Invention

[0003] The purpose of the present application is to provide a method and device for adjusting the dynamic balance of an electric drive system, which can adjust the assembly phase angle between the motor rotor and the input shaft, is beneficial to improving the dynamic balance of the electric drive system, and is of great help in solving the problem of in-vehicle booming.

[0004] The first aspect of the present application provides a method for adjusting the dynamic balance of an electric drive system, including:

[0005] Obtaining the allowable remaining unbalance of the motor rotor;

[0006] Measuring the first unbalance of the left and right end faces of the motor rotor after weight removal;

[0007] When it is determined that the remaining unbalance of the motor rotor meets the preset requirements based on the first unbalance and the allowable remaining unbalance, measuring the second unbalance of the left and right end faces of the input shaft;

[0008] Calculating the first unbalance synthesis vector of the unbalances of the left and right end faces of the motor rotor based on the first unbalance;

[0009] Calculating the second unbalance synthesis vector of the unbalances of the left and right end faces of the input shaft based on the second unbalance;

[0010] Determining the assembly angle between the motor rotor and the input shaft based on the first unbalance synthesis vector and the second unbalance synthesis vector;

[0011] Assembling the motor rotor and the input shaft based on the assembly angle.

[0012] In the above implementation process, this method can effectively solve the problem of phase mismatch caused by random assembly by precisely adjusting the assembly phase angle between the motor rotor and the input shaft, significantly improving the dynamic balance performance of the electric drive system, and having a significant effect on reducing the booming noise in the vehicle, improving driving comfort and vehicle quality.

[0013] Further, the obtaining of the allowable residual unbalance of the motor rotor includes:

[0014] Obtaining the rotor data of the motor; wherein, the rotor data at least includes the rotor balance quality grade, the rotor mass, and the rotor operating speed;

[0015] Calculating the allowable residual unbalance of the motor rotor according to the rotor data.

[0016] Further, the measuring of the first unbalance of the left and right end faces of the motor rotor after weight removal includes:

[0017] Measuring the original unbalance of the left and right end faces of the motor rotor; wherein, the original unbalance includes the left original unbalance of the left end face of the motor rotor and the right original unbalance of the right end face of the motor rotor;

[0018] Based on the original unbalance, measuring the first unbalance of the left and right end faces of the motor rotor after weight removal; wherein, the first unbalance includes the left weight-removed unbalance of the left end face of the motor rotor after weight removal and the right weight-removed unbalance of the right end face of the motor rotor after weight removal.

[0019] Further, the calculating of the first unbalance composite vector of the unbalances of the left and right end faces of the motor rotor based on the first unbalance includes:

[0020] Based on the first unbalance, calculating the first composite vector angle and the first composite vector amplitude of the unbalances of the left and right end faces of the motor rotor by using the vector drawing method;

[0021] Determining the first unbalance composite vector according to the first composite vector angle and the first composite vector amplitude.

[0022] Further, the calculating of the second unbalance composite vector of the unbalances of the left and right end faces of the input shaft based on the second unbalance includes:

[0023] Based on the second unbalance, calculating the second composite vector angle and the second composite vector amplitude of the unbalances of the left and right end faces of the input shaft by using the vector drawing method;

[0024] Determining the second unbalance composite vector according to the second composite vector angle and the second composite vector amplitude.

[0025] Further, the method further includes:

[0026] When it is determined that the remaining unbalance of the motor rotor does not meet the preset requirements based on the first unbalance and the allowable remaining unbalance, the first unbalance of the left and right end faces of the motor rotor after measurement and weight removal is executed.

[0027] Further, the assembling of the motor rotor and the input shaft based on the assembling angle includes:

[0028] Assembling the motor rotor and the input shaft based on the assembling angle in a spline connection manner, so that the angle between the first unbalance resultant vector and the second unbalance resultant vector is 180°.

[0029] The second aspect of the present application provides a dynamic balance adjustment device for an electric drive system, and the dynamic balance adjustment device for the electric drive system includes:

[0030] An acquisition unit for acquiring the allowable remaining unbalance of the motor rotor;

[0031] A first measurement unit for measuring the first unbalance of the left and right end faces of the motor rotor after weight removal;

[0032] A second measurement unit for measuring the second unbalance of the left and right end faces of the input shaft when it is determined that the remaining unbalance of the motor rotor meets the preset requirements based on the first unbalance and the allowable remaining unbalance;

[0033] A first calculation unit for calculating a first unbalance resultant vector of the unbalances of the left and right end faces of the motor rotor based on the first unbalance;

[0034] A second calculation unit for calculating a second unbalance resultant vector of the unbalances of the left and right end faces of the input shaft based on the second unbalance;

[0035] A determination unit for determining the assembling angle of the motor rotor and the input shaft based on the first unbalance resultant vector and the second unbalance resultant vector;

[0036] An assembling unit for assembling the motor rotor and the input shaft based on the assembling angle.

[0037] Further, the acquisition unit includes:

[0038] An acquisition subunit for acquiring the rotor data of the motor; wherein the rotor data at least includes the rotor balance quality grade, the rotor mass, and the rotor operating speed;

[0039] A first calculation subunit for calculating the allowable remaining unbalance of the motor rotor according to the rotor data.

[0040] Further, the first measurement unit is specifically configured to measure the original unbalance amounts of the left and right end faces of the motor rotor; wherein, the original unbalance amounts include the left original unbalance amount of the left end face of the motor rotor and the right original unbalance amount of the right end face of the motor rotor.

[0041] The first measurement unit is further specifically configured to measure the first unbalance amounts of the left and right end faces of the motor rotor after weight removal based on the original unbalance amounts; wherein, the first unbalance amounts include the left weight-removed unbalance amount of the left end face of the motor rotor after weight removal and the right weight-removed unbalance amount of the right end face of the motor rotor after weight removal.

[0042] Further, the first calculation unit includes:

[0043] A second calculation sub-unit, configured to calculate the first resultant vector angle and the first resultant vector amplitude of the unbalance amounts of the left and right end faces of the motor rotor by using a vector drawing method based on the first unbalance amounts.

[0044] A first determination sub-unit, configured to determine a first unbalance resultant vector according to the first resultant vector angle and the first resultant vector amplitude.

[0045] Further, the second calculation unit includes:

[0046] A third calculation sub-unit, configured to calculate the second resultant vector angle and the second resultant vector amplitude of the unbalance amounts of the left and right end faces of the input shaft by using a vector drawing method based on the second unbalance amounts.

[0047] A second determination sub-unit, configured to determine a second unbalance resultant vector according to the second resultant vector angle and the second resultant vector amplitude.

[0048] Further, the first measurement unit is further configured to measure the first unbalance amounts of the left and right end faces of the motor rotor after weight removal when it is determined that the remaining unbalance amount of the motor rotor does not meet the preset requirements based on the first unbalance amounts and the allowable remaining unbalance amount.

[0049] Further, the assembly unit is specifically configured to assemble the motor rotor and the input shaft based on the assembly angle in a spline connection manner, so that the angle between the first unbalance resultant vector and the second unbalance resultant vector is 180°.

[0050] A third aspect of the present application provides an electronic device, including a memory and a processor, where the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the electric drive system dynamic balance adjustment method according to any one of the first aspects of the present application.

[0051] The fourth aspect of the present application provides a computer-readable storage medium storing computer program instructions, which, when read and executed by a processor, execute the electric drive system dynamic balance adjustment method according to any one of the first aspects of the present application.

[0052] The beneficial effects of the present application are as follows: It can systematically obtain the allowable residual unbalance of the motor rotor, and at the same time accurately measure and calculate the unbalance composite vector of the motor rotor and the input shaft, so as to determine the optimal assembly angle, and then realize the high-precision assembly of the motor rotor and the input shaft, effectively improving the dynamic balance performance of the electric drive system and significantly reducing the vehicle interior noise problem caused by the mismatch of the assembly phase. Description of the Drawings

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0054] Figure 1 It is a schematic flow chart of an electric drive system dynamic balance adjustment method provided by an embodiment of the present application;

[0055] Figure 2 It is a schematic flow chart of another electric drive system dynamic balance adjustment method provided by an embodiment of the present application;

[0056] Figure 3 It is a schematic diagram of the synthesis and solution of the unbalance composite vector of both end faces provided by an embodiment of the present application;

[0057] Figure 4 It is a cross-sectional view of the assembly of a motor rotor and an input shaft provided by an embodiment of the present application;

[0058] Figure 5 It is an axial view of the assembly of a motor rotor and an input shaft provided by an embodiment of the present application;

[0059] Figure 6 It is a schematic structural diagram of an electric drive system dynamic balance adjustment device provided by an embodiment of the present application;

[0060] Figure 7 It is a schematic structural diagram of another electric drive system dynamic balance adjustment device provided by an embodiment of the present application. Detailed Embodiments

[0061] The following will describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application.

[0062] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0063] Embodiment 1

[0064] Please refer to Figure 1 , Figure 1 , which is a schematic flow chart of a dynamic balance adjustment method for an electric drive system provided in this embodiment. Among them, the dynamic balance adjustment method for the electric drive system includes:

[0065] S101. Obtain the allowable remaining unbalance of the motor rotor.

[0066] S102. Measure the first unbalance of the left and right end faces of the motor rotor after weight removal.

[0067] S103. When it is determined that the remaining unbalance of the motor rotor meets the preset requirements based on the first unbalance and the allowable remaining unbalance, measure the second unbalance of the left and right end faces of the input shaft.

[0068] As an optional implementation manner, the method further includes:

[0069] When it is determined that the remaining unbalance of the motor rotor does not meet the preset requirements based on the first unbalance and the allowable remaining unbalance, then execute the step of measuring the first unbalance of the left and right end faces of the motor rotor after weight removal.

[0070] Implementing this implementation manner, the method can, when it is determined that the remaining unbalance of the motor rotor does not meet the preset requirements, repeatedly execute the weight removal step shown in step S102 until the remaining unbalance of the motor rotor meets the allowable remaining unbalance requirement (i.e., the preset requirement).

[0071] Implementing this implementation manner, step S102 can be repeatedly executed when the remaining unbalance of the motor rotor does not meet the preset requirements.

[0072] S104. Calculate the first unbalance synthesis vector of the unbalances of the left and right end faces of the motor rotor based on the first unbalance.

[0073] S105. Calculate the second unbalance synthesis vector of the unbalances of the left and right end faces of the input shaft based on the second unbalance.

[0074] S106. Determine the assembly angle of the motor rotor and the input shaft based on the first unbalance synthesis vector and the second unbalance synthesis vector.

[0075] S107. Assemble the motor rotor and the input shaft based on the assembly angle.

[0076] In this embodiment, the execution subject of this method can be a computing device such as a computer or a server, and no limitation is made in this embodiment.

[0077] In this embodiment, the execution subject of this method can also be a smart device such as a smart phone or a tablet computer, and no limitation is made in this embodiment.

[0078] It can be seen that implementing the dynamic balance adjustment method of the electric drive system described in this embodiment can systematically obtain the allowable residual unbalance of the motor rotor, and at the same time accurately measure and calculate the unbalance synthesis vector of the motor rotor and the input shaft, so as to determine the optimal assembly angle, and further achieve the high-precision assembly of the motor rotor and the input shaft, effectively improving the dynamic balance performance of the electric drive system and significantly reducing the in-vehicle noise problem caused by the mismatch of the assembly phase.

[0079] Embodiment 2

[0080] Please refer to Figure 2 , Figure 2 , which is a schematic flowchart of a dynamic balance adjustment method for an electric drive system provided in this embodiment. Among them, the dynamic balance adjustment method for the electric drive system includes:

[0081] S201. Obtain the rotor data of the motor; wherein, the rotor data at least includes the rotor balance quality grade, the rotor mass, and the rotor operating speed.

[0082] S202. Calculate the allowable residual unbalance of the motor rotor according to the rotor data.

[0083] As an optional implementation manner, the allowable residual unbalance u per of the motor rotor is calculated by the formula:

[0084] U per = 1000 * [(e per * Ω) * m] / Ω;

[0085] Wherein, U per is the allowable residual unbalance, and the unit is g.mm;

[0086] e per is the allowable residual unbalance degree;

[0087] (e per * Ω) is the rotor balance quality level, and at the same time (e per * Ω) = G, and G is also the rotor balance quality grade, and the unit is mm / s;

[0088] m is the rotor mass, and the unit is kg;

[0089] Ω is the operating speed, with the unit of rad / s.

[0090] S203. Measure the original unbalance of the left and right end faces of the motor rotor; where the original unbalance includes the left original unbalance of the left end face of the motor rotor and the right original unbalance of the right end face of the motor rotor.

[0091] In this embodiment, the method measures the unbalances of the left and right end faces of the original motor rotor, and simultaneously sets the reference zero-phase position. Then, according to the measurement results, material removal is performed on the left and right end faces of the rotor.

[0092] S204. Based on the original unbalance, measure the first unbalances of the left and right end faces of the motor rotor after material removal; where the first unbalances include the left material-removal unbalance of the left end face of the motor rotor after material removal and the right material-removal unbalance of the right end face of the motor rotor after material removal.

[0093] In this embodiment, the method measures the unbalances of the left and right end faces of the motor rotor after material removal, and compares them with the allowable remaining unbalance to confirm whether the remaining unbalance of the rotor meets the requirements. Where when it does not meet the requirements, it is necessary to continue to repeat step S203 to repeat the material-removal operation until the remaining unbalance of the rotor meets the requirements, and record the unbalances and their phase angles of the left and right end faces at this time.

[0094] S205. When it is determined that the remaining unbalance of the motor rotor meets the preset requirements based on the first unbalance and the allowable remaining unbalance, measure the second unbalances of the left and right end faces of the input shaft.

[0095] In this embodiment, the method measures the unbalances of the two end faces of the input shaft at this time, and records the unbalances and their phase angles of the left and right end faces.

[0096] S206. Based on the first unbalance, use the vector graphing method to calculate the first resultant vector angle and the first resultant vector amplitude of the unbalances of the left and right end faces of the motor rotor.

[0097] S207. Determine the first unbalance resultant vector according to the first resultant vector angle and the first resultant vector amplitude.

[0098] In this embodiment, the method can use the vector graphing method to obtain the resultant vector angle and amplitude of the unbalances of the two end faces of the motor rotor, and at the same time can perform parametric modeling on the amplitudes and phases of the unbalances of the left and right end faces, realizing fast batch processing.

[0099] Please refer to Figure 3 , Figure 3The figure shows a schematic diagram for solving the synthesis of the unbalanced synthesis vectors at both end faces. Among them, OL represents the phase (52°) and amplitude (6.32 gmm) of the unbalance amount at the left end face, OR represents the phase (107°) and amplitude (5.48 gmm) of the unbalance amount at the right end face, and OA represents the phase (77.38°) and amplitude (10.47 gmm) of the synthesis vector of the unbalance amounts at the two end faces.

[0100] S208. Based on the second unbalance amount, use the vector drawing method to calculate the second synthesis vector angle and the second synthesis vector amplitude of the unbalance amounts at the left and right end faces of the input shaft.

[0101] S209. Determine the second unbalanced synthesis vector according to the second synthesis vector angle and the second synthesis vector amplitude.

[0102] In this embodiment, similar to the motor rotor, the appropriate angle and amplitude of the unbalanced synthesis vector at the two end faces of the input shaft can also be obtained by the vector drawing method.

[0103] In this embodiment, this method can perform parametric modeling on the amplitudes and phases of the unbalance amounts at the left and right end faces, so as to facilitate rapid batch processing.

[0104] S210. Based on the first unbalanced synthesis vector and the second unbalanced synthesis vector, determine the assembly angle between the motor rotor and the input shaft.

[0105] S211. In the way of spline connection, assemble the motor rotor and the input shaft based on the assembly angle, so that the angle between the first unbalanced synthesis vector and the second unbalanced synthesis vector is 180°.

[0106] In this embodiment, this method proposes to assemble the motor rotor and the input shaft at a specific angle to avoid random assembly of the traditional method.

[0107] In this embodiment, the motor rotor and the input shaft are connected by splines.

[0108] Please refer to Figure 4 , Figure 4 which shows a cross-sectional view of the assembly of a motor rotor 10 and an input shaft 20. Among them, when the input shaft spline and the rotor spline are matched (spline fit 30), the unbalanced synthesis vector of the motor rotor and the unbalanced synthesis vector of the input shaft can be assembled with a mutual angle of 180°.

[0109] Considering the spline fit, if it is impossible to assemble with a mutual angle of 180°, it is necessary to assemble as close to 180° as possible.

[0110] Please refer to Figure 5 , Figure 5An axial view of the assembly of a motor rotor 10 and an input shaft 20 is shown. Among them, OA represents the unbalanced resultant vector of the motor rotor 10, OB represents the unbalanced resultant vector of the input shaft 20, and OA and OB are 180° to each other.

[0111] Implementing this embodiment, a part of the unbalanced centrifugal forces of the motor rotor and the input shaft can cancel each other out, so it is beneficial to reduce the noise caused by the dynamic unbalance of the electric drive system.

[0112] In this embodiment, the execution subject of this method can be a computing device such as a computer or a server, and no limitation is made in this embodiment.

[0113] In this embodiment, the execution subject of this method can also be a smart device such as a smart phone or a tablet computer, and no limitation is made in this embodiment.

[0114] It can be seen that implementing the dynamic balance adjustment method of the electric drive system described in this embodiment can accurately determine the assembly phase angle between the motor rotor and the input shaft, thereby effectively improving the dynamic balance performance of the electric drive system, and further solving the booming problem inside the vehicle. In this process, by using the vector drawing method to obtain the resultant vector for the two end faces of the motor rotor and the two end faces of the input shaft respectively, and applying the parametric graphic modeling technology, accurate and efficient batch processing can be achieved, so as to effectively improve the efficiency and accuracy of solving such problems.

[0115] Embodiment 3

[0116] Please refer to Figure 6 , Figure 6 which is a schematic structural diagram of a dynamic balance adjustment device for an electric drive system provided in this embodiment. As Figure 6 shown, the dynamic balance adjustment device for the electric drive system includes:

[0117] An acquisition unit 310, configured to acquire the allowable remaining unbalance of the motor rotor;

[0118] A first measurement unit 320, configured to measure the first unbalance of the left and right end faces of the motor rotor after removing the weight;

[0119] A second measurement unit 330, configured to measure the second unbalance of the left and right end faces of the input shaft when it is determined that the remaining unbalance of the motor rotor meets the preset requirements based on the first unbalance and the allowable remaining unbalance;

[0120] A first calculation unit 340, configured to calculate the first unbalanced resultant vector of the unbalances of the left and right end faces of the motor rotor based on the first unbalance;

[0121] A second calculation unit 350, configured to calculate a second unbalance synthesis vector of the unbalances on the left and right end faces of the input shaft based on the second unbalance amount;

[0122] A determination unit 360, configured to determine an assembly angle between the motor rotor and the input shaft based on the first unbalance synthesis vector and the second unbalance synthesis vector;

[0123] An assembly unit 370, configured to assemble the motor rotor and the input shaft based on the assembly angle.

[0124] In this embodiment, the explanation of the dynamic balance adjustment device for the electric drive system may refer to the descriptions in Embodiment 1 or Embodiment 2, and thus will not be elaborated herein.

[0125] It can be seen that implementing the dynamic balance adjustment device for the electric drive system described in this embodiment can systematically obtain the allowable residual unbalance amount of the motor rotor, and at the same time accurately measure and calculate the unbalance synthesis vector of the motor rotor and the input shaft, so as to determine the optimal assembly angle based on this, and further realize the high-precision assembly of the motor rotor and the input shaft, effectively improving the dynamic balance performance of the electric drive system and significantly reducing the in-vehicle noise problem caused by the mismatch of the assembly phase.

[0126] Embodiment 4

[0127] Please refer to Figure 7 , Figure 7 which is a schematic structural diagram of a dynamic balance adjustment device for an electric drive system provided in this embodiment. As Figure 7 shown, the dynamic balance adjustment device for the electric drive system includes:

[0128] An acquisition unit 310, configured to acquire the allowable residual unbalance amount of the motor rotor;

[0129] A first measurement unit 320, configured to measure the first unbalance amounts on the left and right end faces of the motor rotor after removing the weights;

[0130] A second measurement unit 330, configured to measure the second unbalance amounts on the left and right end faces of the input shaft when it is determined that the residual unbalance amount of the motor rotor meets the preset requirements based on the first unbalance amount and the allowable residual unbalance amount;

[0131] A first calculation unit 340, configured to calculate a first unbalance synthesis vector of the unbalance amounts on the left and right end faces of the motor rotor based on the first unbalance amount;

[0132] A second calculation unit 350, configured to calculate a second unbalance synthesis vector of the unbalance amounts on the left and right end faces of the input shaft based on the second unbalance amount;

[0133] A determination unit 360, configured to determine an assembly angle between the motor rotor and the input shaft based on a first unbalance resultant vector and a second unbalance resultant vector;

[0134] An assembly unit 370, configured to assemble the motor rotor and the input shaft based on the assembly angle.

[0135] As an alternative implementation, the acquisition unit 310 includes:

[0136] An acquisition subunit 311, configured to acquire rotor data of the motor; wherein the rotor data includes at least a rotor balance quality grade, a rotor mass, and a rotor operating speed;

[0137] A first calculation subunit 312, configured to calculate an allowable residual unbalance of the motor rotor according to the rotor data.

[0138] As an alternative implementation, the first measurement unit 320 is specifically configured to measure the original unbalances of the left and right end faces of the motor rotor; wherein the original unbalances include a left original unbalance of the left end face of the motor rotor and a right original unbalance of the right end face of the motor rotor;

[0139] The first measurement unit 320 is further specifically configured to measure a first unbalance of the left and right end faces of the motor rotor after weight removal based on the original unbalances; wherein the first unbalances include a left weight-removed unbalance of the left end face of the motor rotor after weight removal and a right weight-removed unbalance of the right end face of the motor rotor after weight removal.

[0140] As an alternative implementation, the first calculation unit 340 includes:

[0141] A second calculation subunit 341, configured to calculate a first resultant vector angle and a first resultant vector amplitude of the unbalances of the left and right end faces of the motor rotor by using a vector drawing method based on the first unbalances;

[0142] A first determination subunit 342, configured to determine a first unbalance resultant vector according to the first resultant vector angle and the first resultant vector amplitude.

[0143] As an alternative implementation, the second calculation unit 350 includes:

[0144] A third calculation subunit 351, configured to calculate a second resultant vector angle and a second resultant vector amplitude of the unbalances of the left and right end faces of the input shaft by using a vector drawing method based on the second unbalances;

[0145] A second determination subunit 352, configured to determine a second unbalance resultant vector according to the second resultant vector angle and the second resultant vector amplitude.

[0146] As an alternative embodiment, the first measurement unit 320 is further configured to, when it is determined that the remaining unbalance of the motor rotor does not meet the preset requirements based on the first unbalance and the allowable remaining unbalance, repeatedly measure the first unbalance of the left and right end faces of the motor rotor after removing the unbalance until the allowable remaining unbalance requirements are met.

[0147] Implementing this embodiment, when the first measurement unit 320 determines that the remaining unbalance of the motor rotor does not meet the preset requirements, the device can repeatedly trigger the first measurement unit 320 to perform the unbalance removal operation until the remaining unbalance of the motor rotor meets the allowable remaining unbalance requirements (i.e., the preset requirements).

[0148] As an alternative embodiment, the assembly unit 370 is specifically configured to assemble the motor rotor and the input shaft based on the assembly angle in a spline connection manner, so that the angle between the first unbalance resultant vector and the second unbalance resultant vector is 180°.

[0149] In this embodiment, the explanation of the dynamic balance adjustment device for the electric drive system can refer to the description in Embodiment 1 or Embodiment 2, and thus will not be elaborated herein.

[0150] It can be seen that implementing the dynamic balance adjustment device for the electric drive system described in this embodiment can accurately determine the assembly phase angle between the motor rotor and the input shaft, thereby effectively improving the dynamic balance performance of the electric drive system, and further solving the booming problem inside the vehicle. In this process, by using the vector drawing method to obtain the resultant vectors for the two end faces of the motor rotor and the two end faces of the input shaft respectively, and applying the parametric graphic modeling technology, accurate and efficient batch processing can be achieved, thus effectively improving the efficiency and accuracy of solving such problems.

[0151] An embodiment of the present application provides an electronic device, including a memory and a processor. The memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the dynamic balance adjustment method for the electric drive system in Embodiment 1 or Embodiment 2 of the present application.

[0152] An embodiment of the present application provides a computer-readable storage medium, which stores computer program instructions. When the computer program instructions are read and run by a processor, the dynamic balance adjustment method for the electric drive system in Embodiment 1 or Embodiment 2 of the present application is executed.

[0153] In several embodiments provided by the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of devices, methods, and computer program products according to multiple embodiments of the present application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0154] In addition, each functional module in various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0155] If the above functions are implemented in the form of software functional modules and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0156] The above are only embodiments of the present application and are not intended to limit the protection scope of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application. It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0157] As described above, this is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, and all should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0158] It should be noted that in this text, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. A method for adjusting the dynamic balance of an electric drive system, characterized in that: include: Obtain the allowable residual unbalance of the motor rotor; Measure the first unbalance amount of the left and right end surfaces of the motor rotor after weight removal; When it is determined based on the first imbalance and the allowable residual imbalance that the residual imbalance of the motor rotor meets the preset requirement, measuring the second imbalance of the left and right end surfaces of the input shaft; Based on the first imbalance amount, calculating a first imbalance synthesis vector of the imbalance amount of the left and right end surfaces of the motor rotor; Based on the second imbalance amount, calculating a second imbalance synthesis vector of the imbalance amount of the left and right end surfaces of the input shaft; Determining an assembly angle between the motor rotor and the input shaft based on the first unbalanced synthetic vector and the second unbalanced synthetic vector; The motor rotor and the input shaft are assembled based on the assembly angle.

2. The electric drive system dynamic balance adjustment method according to claim 1, characterized in that: The step of obtaining the allowable residual unbalance of the motor rotor comprises: Acquire rotor data of the motor; wherein the rotor data at least includes rotor balance quality grade, rotor mass and rotor operating speed; The allowable residual unbalance of the motor rotor is calculated according to the rotor data.

3. The electric drive system dynamic balance adjustment method according to claim 1, characterized in that: The first unbalance amount of the left and right end surfaces of the motor rotor after weight removal is measured, comprising: Measuring the original unbalance of the left and right end surfaces of the motor rotor; wherein the original unbalance includes the left original unbalance of the left end surface of the motor rotor and the right original unbalance of the right end surface of the motor rotor; Based on the original imbalance, the first imbalance of the left and right end surfaces of the deweighted motor rotor is measured; wherein the first imbalance includes the left deweighted imbalance of the left end surface of the deweighted motor rotor and the right deweighted imbalance of the right end surface of the deweighted motor rotor.

4. The electric drive system dynamic balance adjustment method according to claim 1, characterized in that: The first unbalanced synthetic vector of the unbalanced amounts of the left and right end surfaces of the motor rotor is calculated based on the first unbalanced amount, comprising: Based on the first unbalance, a first synthetic vector angle and a first synthetic vector amplitude of the unbalance of the left and right end surfaces of the motor rotor are calculated by using a vector drawing method; A first unbalanced resultant vector is determined according to the first resultant vector angle and the first resultant vector magnitude.

5. The electric drive system dynamic balance adjustment method according to claim 1, characterized in that: The step of calculating the second unbalanced synthetic vector of the unbalanced amounts of the left and right end surfaces of the input shaft based on the second unbalanced amount comprises: Based on the second unbalance, a second resultant vector angle and a second resultant vector amplitude of the unbalance of the left and right end surfaces of the input shaft are calculated by using a vector drawing method; A second unbalanced resultant vector is determined according to the second resultant vector angle and the second resultant vector magnitude.

6. The electric drive system dynamic balance adjustment method according to claim 1, characterized in that: The method further comprises: When it is determined based on the first imbalance and the allowable residual imbalance that the residual imbalance of the motor rotor does not meet the preset requirement, the first imbalance of the left and right end surfaces of the motor rotor after weight removal is measured.

7. The electric drive system dynamic balance adjustment method according to claim 1, characterized in that: The step of assembling the motor rotor and the input shaft based on the assembly angle includes: The motor rotor and the input shaft are assembled based on the assembly angle in a spline connection manner so that the angle between the first unbalanced resultant vector and the second unbalanced resultant vector is 180°.

8. A dynamic balance adjustment device for an electric drive system, characterized in that: The electric drive system dynamic balance adjustment device comprises: An acquisition unit, used for acquiring an allowable residual unbalance amount of a motor rotor; The first measuring unit is used to measure the first unbalance amount of the left and right end surfaces of the motor rotor after weight removal; A second measuring unit is configured to measure a second unbalance amount of the left and right end surfaces of the input shaft when it is determined that the residual unbalance amount of the motor rotor meets a preset requirement based on the first unbalance amount and the allowable residual unbalance amount; A first calculation unit, configured to calculate a first unbalanced synthetic vector of unbalanced amounts of left and right end surfaces of a motor rotor based on the first unbalanced amount; A second calculation unit, configured to calculate a second unbalanced synthetic vector of unbalanced amounts of left and right end surfaces of the input shaft based on the second unbalanced amount; a determining unit, configured to determine an assembly angle between the motor rotor and the input shaft based on the first unbalanced synthetic vector and the second unbalanced synthetic vector; An assembly unit is used to assemble the motor rotor and the input shaft based on the assembly angle.

9. An electronic device, characterized in that: The electronic device comprises a memory and a processor, the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the electric drive system dynamic balance adjustment method according to any one of claims 1 to 7.

10. A readable storage medium, characterized in that: The readable storage medium stores computer program instructions, and when the computer program instructions are read and executed by a processor, the electric drive system dynamic balance adjustment method according to any one of claims 1 to 7 is executed.

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