A method and device for optimizing a motor, a motor and a new energy vehicle

Abstract

The embodiment of the present invention provides a method, device, motor and new energy vehicle for optimizing a motor, and relates to the technical field of new energy vehicles. The method includes: constructing an initial finite element model of a target motor; determining the air gap magnetic density data of the target motor under no-load conditions according to the initial finite element model; determining the position range of the auxiliary slots and / or auxiliary holes of the motor rotor in the target motor according to the air gap magnetic density data; setting auxiliary slots and / or auxiliary holes on the initial finite element model according to the position range of the auxiliary slots and / or auxiliary holes to obtain a test model; obtaining the current excitation corresponding to the target motor under the test conditions, and performing parameter scanning on the test model according to the current excitation to obtain electromagnetic forces of various orders corresponding to the test conditions; determining the positions of the auxiliary slots and / or auxiliary holes of the target motor according to the electromagnetic forces of various orders. This method helps to obtain a motor with low noise.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a method and device for optimizing a motor, a motor and a new energy vehicle. Background Art

[0002] The motor is one of the core components of new energy vehicles (especially electric vehicles), responsible for converting electrical energy into mechanical energy to drive the vehicle. In recent years, with the rapid development of the new energy vehicle market, although motor technology is constantly improving, people's experience with new energy vehicles is getting higher and higher. Therefore, for new energy vehicles, the noise of the motor is also attracting more and more attention. For pure electric vehicles, the noise mainly comes from the electromagnetic noise of the motor. Due to the high frequency of the electromagnetic noise of the motor, it is more harsh when working, which can easily cause irritation of drivers and passengers. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide a method, device, motor and new energy vehicle for optimizing a motor, wherein the method helps to obtain a motor with low noise.

[0004] In order to achieve the above object, an embodiment of the present invention provides a method for optimizing a motor, the method comprising:

[0005] Construct an initial finite element model of the target motor;

[0006] Determining the air gap flux density data of the target motor under no-load condition according to the initial finite element model;

[0007] Determine the position range of the auxiliary slot and / or auxiliary hole of the motor rotor in the target motor according to the air gap magnetic flux data;

[0008] According to the position range of the auxiliary grooves and / or auxiliary holes, the initial finite element model is provided with auxiliary grooves and / or auxiliary holes to obtain a test model;

[0009] Acquire the current excitation corresponding to the target motor under the test condition, and perform parameter scanning on the test model according to the current excitation to obtain electromagnetic forces of various orders corresponding to the test condition;

[0010] The positions of the auxiliary slots and / or auxiliary holes of the target motor are determined according to the electromagnetic forces of each order.

[0011] Optionally, constructing an initial finite element model of the target motor includes:

[0012] Acquire the geometric model and setting conditions of the target motor;

[0013] constructing an initial finite element model according to the geometric model and setting conditions;

[0014] The initial finite element model is a transient electromagnetic field simulation analysis finite element model.

[0015] Optionally, determining the air gap flux density data of the target motor under a no-load condition according to the initial finite element model includes:

[0016] Determine the stator and rotor topology and magnetic steel size of the target motor according to the output characteristics, demagnetization data, back electromotive force and harmonic content of the target motor;

[0017] The air gap flux density data of the target motor under no-load condition is determined according to the stator-rotor topology structure and the magnetic steel size.

[0018] Optionally, determining the position range of the auxiliary slot and / or auxiliary hole of the motor rotor in the target motor according to the air gap magnetic flux data includes:

[0019] Determine a distortion region of the air gap radial magnetic density according to the air gap magnetic density data, wherein the distortion region is a region where the air gap magnetic density data deviates from a sine curve threshold range;

[0020] The auxiliary grooves and / or auxiliary holes are arranged around the distorted area;

[0021] The diameter of the auxiliary hole is in the range of 1-2 mm.

[0022] Optionally, performing parameter scanning on the test model according to the current excitation to obtain electromagnetic forces of various orders corresponding to the test condition includes:

[0023] Obtaining different speeds and corresponding torques of the target motor under the test condition, wherein the torque includes a constant torque region before the inflection point and a constant power region after the inflection point;

[0024] Determining a test condition according to the constant torque region and the constant power region;

[0025] Acquiring a current excitation of the test condition, wherein the current excitation includes a current and a current angle;

[0026] Performing simulation calculation on the test model to which the current excitation is input to obtain radial electromagnetic force and tangential electromagnetic force on the stator tooth surface;

[0027] Performing Fourier transform on the radial electromagnetic force and the tangential electromagnetic force to obtain electromagnetic forces of various orders corresponding to the test condition.

[0028] Optionally, determining the position of the auxiliary slot and / or auxiliary hole of the target motor according to the electromagnetic forces of each order includes:

[0029] Obtaining the minimum electromagnetic force of the electromagnetic forces of each order;

[0030] Grooves and / or holes are formed on the outer surface and / or the interior of the rotor of the target motor according to the auxiliary grooves and / or auxiliary holes corresponding to the minimum electromagnetic force.

[0031] On the other hand, the present invention also provides a device for optimizing a motor, the device comprising:

[0032] A construction module for constructing an initial finite element model of a target motor;

[0033] A first processing module, configured to determine the air gap flux density data of the target motor under a no-load condition according to the initial finite element model;

[0034] A second processing module is used to determine the position range of the auxiliary slot and / or auxiliary hole of the motor rotor in the target motor according to the air gap magnetic density data;

[0035] A third processing module, configured to set auxiliary slots and / or auxiliary holes on the initial finite element model according to the position range of the auxiliary slots and / or auxiliary holes to obtain a test model;

[0036] A fourth processing module is used to obtain the current excitation corresponding to the target motor under the test condition, and perform parameter scanning on the test model according to the current excitation to obtain electromagnetic forces of various orders corresponding to the test condition;

[0037] The fifth processing module is used to determine the position of the auxiliary slot and / or auxiliary hole of the target motor according to the electromagnetic forces of each order.

[0038] On the other hand, the present invention further provides a motor having auxiliary slots and / or auxiliary holes, wherein positions of the auxiliary slots and / or auxiliary holes are determined according to the above-mentioned method for optimizing a motor.

[0039] On the other hand, the present invention further proposes a new energy vehicle, which includes the motor described above; the new energy vehicle is a new energy working vehicle and / or a new energy passenger vehicle.

[0040] On the other hand, the present invention further proposes a machine-readable storage medium, on which instructions are stored, and the instructions are used to enable a machine to execute: according to the method for optimizing a motor.

[0041] A method for optimizing a motor of the present invention includes: constructing an initial finite element model of a target motor; determining the air gap flux density data of the target motor under no-load conditions according to the initial finite element model; determining the position range of the auxiliary slots and / or auxiliary holes of the motor rotor in the target motor according to the air gap flux density data; setting auxiliary slots and / or auxiliary holes on the initial finite element model according to the position range of the auxiliary slots and / or auxiliary holes to obtain a test model; obtaining the current excitation corresponding to the target motor under the test conditions, performing parameter scanning on the test model according to the current excitation to obtain electromagnetic forces of various orders corresponding to the test conditions; and determining the position of the auxiliary slots and / or auxiliary holes of the target motor according to the electromagnetic forces of various orders. The present invention uses different motor conditions and rotor punching topological structure parameters as optimization geometry, quickly screens electromagnetic force sensitive parameters to determine the rotor topology and optimizes the calculation to obtain the position range of the auxiliary slots and / or auxiliary holes, performs parameter scanning to determine the precise position of the auxiliary slots and / or auxiliary holes of the target motor, and saves computing resources and can quickly obtain a motor with low noise.

[0042] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0044] Figure 1 is a flow chart of a method for optimizing a motor according to the present invention;

[0045] Figure 2 It is a schematic diagram of 24 / 48 times frequency electromagnetic force without auxiliary slots and auxiliary holes;

[0046] Figure 3 It is a schematic diagram of the circumferential distribution of the no-load air gap radial magnetic flux along the rotor;

[0047] Figure 4 is a schematic diagram of the range of slots and / or holes in the rotor;

[0048] Figure 5 It is a schematic diagram of an optimized 24 / 48 frequency-multiplied electromagnetic force with auxiliary slots and auxiliary holes. DETAILED DESCRIPTION

[0049] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0050] Figure 1 is a flow chart of a method for optimizing a motor according to the present invention, such as Figure 1 As shown, the method for optimizing a motor includes: Step S101 is to construct an initial finite element model of a target motor. The target motor may be an 8-pole 48-slot permanent magnet synchronous motor.

[0051] According to a specific implementation, constructing an initial finite element model of a target motor includes: acquiring a geometric model and setting conditions of the target motor; constructing an initial finite element model according to the geometric model and setting conditions; the initial finite element model is a transient electromagnetic field simulation analysis finite element model.

[0052] Specifically, the initial finite element model is a finite element model for transient electromagnetic field simulation analysis of the motor, including geometric modeling of key electromagnetic components such as stator and rotor punchings, windings, and magnetic steel. Assign the correct materials to the components, such as stator and rotor punchings brand B27AHV1400, winding material copper, and magnetic steel brand N42UH. Set the correct excitation and boundary conditions, master-slave boundary conditions and zero vector boundary conditions, rationally divide the grid, and select the appropriate grid size for different components.

[0053] Step S102 is to determine the air gap magnetic flux data of the target motor under no-load condition according to the initial finite element model. The no-load condition is that the target motor is running under no-load idling condition. The magnetic lines of force in the motor will pass through the stator and rotor cores and the air gap. Due to the large magnetic resistance of the air gap, the magnetic pressure drop of the air gap occupies the vast majority of the magnetic circuit in the case of non-deep saturation. The magnetic field in the air gap includes radial components and tangential components, of which the radial component is dominant.

[0054] According to a specific implementation, determining the air gap flux density data of the target motor under no-load conditions based on the initial finite element model includes: determining the stator and rotor topology structure and magnetic steel size of the target motor based on the output characteristics, demagnetization data, back electromotive force and harmonic content of the target motor; determining the air gap flux density data of the target motor under no-load conditions based on the stator and rotor topology structure and magnetic steel size.

[0055] The present invention uses rotor punching topological structure parameters as optimized geometry for different motor working conditions, thereby realizing rapid screening and optimized calculation of electromagnetic force sensitive parameters.

[0056] Step S103 is to determine the position range of the auxiliary slots and / or auxiliary holes of the motor rotor in the target motor according to the air gap flux density data.

[0057] According to a specific implementation, determining the position range of the auxiliary slots and / or auxiliary holes of the motor rotor in the target motor according to the air gap magnetic density data includes: determining the distortion area of ​​the air gap radial magnetic density according to the air gap magnetic density data, the distortion area is the area where the waveform of the air gap magnetic density data deviates from the sinusoidal curve threshold range; the auxiliary slots and / or auxiliary holes are arranged around the distortion area; the diameter range of the auxiliary holes is 1-2 mm.

[0058] Specifically, the auxiliary slots and / or auxiliary holes are arranged around the distortion region, which means that the auxiliary slots and / or auxiliary holes are arranged within the threshold region of the distortion region. This method can quickly and accurately obtain the position range of the auxiliary slots and / or auxiliary holes of the motor rotor in the target motor.

[0059] Step S104 is to set auxiliary slots and / or auxiliary holes on the initial finite element model according to the position range of the auxiliary slots and / or auxiliary holes to obtain a test model.

[0060] Specifically, multiple test models are constructed according to the auxiliary slot and / or auxiliary hole position range, including: auxiliary slots and / or auxiliary holes are set for the initial finite element model, and the auxiliary slots and / or auxiliary holes meet the auxiliary slot and / or auxiliary hole position range. The test model with auxiliary slots and / or auxiliary holes is used for the following test. By setting auxiliary slots and / or auxiliary holes for the above-mentioned initial finite element model according to the auxiliary slot and / or auxiliary hole position range, the range of the test model can be accurately narrowed, computing resources are saved, and it is conducive to the subsequent rapid acquisition of a motor with low noise.

[0061] Step S105 is to obtain the current excitation corresponding to the target motor under the test condition, and perform parameter scanning on the test model according to the current excitation to obtain electromagnetic forces of various orders corresponding to the test condition.

[0062] Specifically, the motor electromagnetic force test operating points are selected. For the constant torque zone before the inflection point, the operating conditions of 25%, 50%, 75%, and 100% maximum torque in the constant torque zone are selected as the test conditions. For the constant power zone after the inflection point, the operating conditions corresponding to 25%, 50%, 75%, and 100% maximum torque are selected as the test conditions every 500rpm to obtain the corresponding current excitation input of the operating point, including the current value and current angle.

[0063] According to a specific implementation manner, the test model is parameter scanned according to the current excitation to obtain electromagnetic forces of various orders corresponding to the test condition, including: obtaining different speeds of the target motor and their corresponding torques under the test condition, the torque including a constant torque zone before the inflection point and a constant power zone after the inflection point; determining the test condition according to the constant torque zone and the constant power zone; obtaining the current excitation of the test condition, the current excitation including the current and the current angle; simulating and calculating the test model input with the current excitation to obtain the radial electromagnetic force and the tangential electromagnetic force of the stator tooth surface; and performing Fourier transform on the radial electromagnetic force and the tangential electromagnetic force to obtain electromagnetic forces of various orders corresponding to the test condition.

[0064] The initial finite element model is calculated and optimized through scripts and simulation software to obtain the corresponding rotor topology. For example, firstly, a parameter sensitivity analysis is performed on the initial finite element model to determine the sensitive parameters that affect the electromagnetic force of the motor (such as the magnetic steel angle and position, etc.), and the sensitive parameters are used as scanning parameter test conditions as the calculation point matrix. Then, the working conditions and scanning points are used as calculation points through the script, and the order of electromagnetic force to be solved and output is set, and then electromagnetic analysis calculations are performed. The stator surface grid information is read through the software, and the stator tooth surface grid nodes are selected as the target grid nodes as the electromagnetic force calculation targets. Finally, the Fourier transform of the script is used to output the visualized electromagnetic force data of each order corresponding to the working conditions and parameters. Figure 2 As shown, for the optimized 100% maximum torque condition before the inflection point, the 24 / 48 times frequency electromagnetic force are 2073Pa / 2127Pa respectively.

[0065] like Figure 5 As shown, the position range of the auxiliary slots and / or auxiliary holes is used as a scanning matrix to scan the optimized finite element model to obtain electromagnetic force data, including: using the angle position and size of the auxiliary slots as optimization parameters to form a scanning matrix; scanning and analyzing the scanning matrix to obtain electromagnetic force data.

[0066] The present invention uses the motor operating conditions and rotor geometric parameters as an optimization set, uses the written program joint simulation software to quickly screen and optimize the electromagnetic force sensitive parameters, and then performs Fourier transform to extract the electromagnetic force order of interest for analysis. This method can quickly and accurately find the optimization solution, improve calculation efficiency, and save calculation resources.

[0067] Step S106 is to determine the position of the auxiliary slot and / or auxiliary hole of the target motor according to the electromagnetic forces of each order.

[0068] According to a specific implementation, the position of the auxiliary slots and / or auxiliary holes of the target motor is determined according to the electromagnetic forces of each order, including: obtaining the minimum electromagnetic force of the electromagnetic forces of each order; and slotting and / or drilling the outer surface and / or the inside of the rotor of the target motor according to the auxiliary slots and / or auxiliary holes corresponding to the minimum electromagnetic force. The present invention greatly reduces the electromagnetic force of the motor by opening auxiliary slots on the surface of the rotor punching sheet and auxiliary holes inside.

[0069] The method of using the auxiliary slots corresponding to the minimum electromagnetic force in the electromagnetic force data to slot and drill holes on the outer surface and inside of the rotor of the target motor includes: forming a target data solution set according to the electromagnetic force data; obtaining the leading edge surface data of the target data solution set to obtain the minimum electromagnetic force; and slotting and drilling holes on the outer surface of the rotor of the target motor according to the auxiliary slots and auxiliary holes corresponding to the minimum electromagnetic force.

[0070] like Figure 3 As shown, taking the "double V" structure of the magnetic steel as an example, according to the air gap magnetic flux distribution, one position of the auxiliary slot on the outer surface of the motor's rotor can be taken near the end of the large V magnetic steel. Another position of the auxiliary slot on the outer surface of the rotor can be taken near the end of the small V magnetic steel. Using the angle position and size of the auxiliary slot as optimization parameters, a scanning matrix is ​​formed, and then the software is used for scanning analysis to obtain the simulation results. Taking the spatial 0th order 24 / 48th frequency as the optimization target, the scanning result data forms a Pareto frontier (the Pareto frontier is the surface formed by the optimal set in space). The results on the Pareto frontier are all relatively good results. Finally, the Pareto frontier result is determined to select the optimal solution to optimize the electromagnetic force of the motor.

[0071] Finally, the auxiliary holes opened on both sides of the d-axis inside the rotor have a great effect on improving the 24 / 48 frequency-multiplied electromagnetic force. The manufacturing process generally requires a hole size larger than 1mm in diameter. Considering the rotor strength problem, it is more appropriate to open a circular hole with a diameter of 1-2mm. The radial magnetic flux of the air gap is significantly distorted in some areas, and the curve deviates from the sine curve. Therefore, opening corresponding auxiliary slots and / or auxiliary holes within these areas can correct the radial magnetic flux of the air gap. Slots / holes of appropriate positions and sizes can reduce the harmonic content of the magnetic field and thus reduce the electromagnetic force. The range of opening auxiliary slots / holes is the rotor position corresponding to the magnetic flux distortion area.

[0072] like Figure 4 As shown, the auxiliary slots and auxiliary holes are mainly opened based on the air gap magnetic flux waveform results to determine the approximate position (such as the position circled in the figure), and then the parameter scanning is performed by software to determine the final position and size results based on the simulation results.

[0073] For a three-phase AC 48-slot 8-pole permanent magnet synchronous motor, the main consideration is the electromagnetic force of the 24 / 48-fold frequency of the 0th order in space. The stator teeth are treated as cantilever beams, and the vibration deflection is proportional to the fourth power of the spatial order, so the 0th order in space is the main vibration order. For the case of 8 poles, the number of pole pairs is 4. In harmonic analysis, the 5th and 7th harmonics correspond to the 6th frequency, and when calculating the total frequency, it is necessary to multiply by the pole pair number, that is, 6 times 4, which is the 24th order. Similarly, the 11th and 13th harmonics correspond to the 12th frequency, and then multiplied by the pole pair number 4, the result is 48 times the frequency. The present invention has an obvious optimization effect on the 24 / 48-fold frequency electromagnetic force, and greatly reduces the noise of the motor.

[0074] On the other hand, the present invention also proposes a device for optimizing a motor, the method comprising: a construction module, used to construct an initial finite element model of the target motor; a first processing module, used to determine the air gap magnetic density data of the target motor under no-load conditions based on the initial finite element model; a second processing module, used to determine the position range of the auxiliary slots and / or auxiliary holes of the motor rotor in the target motor based on the air gap magnetic density data; a third processing module, used to set auxiliary slots and / or auxiliary holes for the initial finite element model according to the position range of the auxiliary slots and / or auxiliary holes to obtain a test model; a fourth processing module, used to obtain the current excitation corresponding to the target motor under the test condition, and perform parameter scanning on the test model according to the current excitation to obtain the electromagnetic forces of each order corresponding to the test condition; a fifth processing module, used to determine the position of the auxiliary slots and / or auxiliary holes of the target motor according to the electromagnetic forces of each order.

[0075] Specifically, the construction of the initial finite element model of the target motor includes: obtaining the geometric model and setting conditions of the target motor; constructing the initial finite element model according to the geometric model and setting conditions; the initial finite element model is a transient electromagnetic field simulation analysis finite element model. The determination of the air gap flux density data of the target motor under no-load conditions according to the initial finite element model includes: determining the stator and rotor topological structure and magnetic steel size of the target motor according to the output characteristics, demagnetization data, back electromotive force and harmonic content of the target motor; determining the air gap flux density data of the target motor under no-load conditions according to the stator and rotor topological structure and magnetic steel size.

[0076] The determining of the position range of the auxiliary slots and / or auxiliary holes of the motor rotor in the target motor according to the air gap magnetic flux data includes: determining the distortion area of ​​the air gap radial magnetic flux according to the air gap magnetic flux data, the distortion area is the area where the waveform of the air gap magnetic flux data deviates from the threshold range of the sine curve; the auxiliary slots and / or auxiliary holes are arranged around the distortion area; the diameter range of the auxiliary holes is 1-2mm. The parameter scanning of the test model according to the current excitation to obtain the electromagnetic forces of each order corresponding to the test condition includes: obtaining different speeds of the target motor under the test condition and their corresponding torques, the torque includes a constant torque area before the inflection point and a constant power area after the inflection point; determining the test condition according to the constant torque area and the constant power area; obtaining the current excitation of the test condition, the current excitation includes the current and the current angle; simulating and calculating the test model input with the current excitation to obtain the radial electromagnetic force and the tangential electromagnetic force of the stator tooth surface; Fourier transforming the radial electromagnetic force and the tangential electromagnetic force to obtain the electromagnetic forces of each order corresponding to the test condition.

[0077] The method of determining the positions of the auxiliary slots and / or auxiliary holes of the target motor according to the electromagnetic forces of each order includes: obtaining the minimum electromagnetic force of the electromagnetic forces of each order; and making slots and / or holes on the outer surface and / or interior of the rotor of the target motor according to the auxiliary slots and / or auxiliary holes corresponding to the minimum electromagnetic force.

[0078] The device uses different working conditions of the motor and the rotor punching topology parameters as the optimized geometry, quickly screens electromagnetic force sensitive parameters to determine the rotor topology and optimizes the calculation to obtain the auxiliary slot and / or auxiliary hole position range, and performs parametric scanning to determine the precise position of the auxiliary slot and / or auxiliary hole of the target motor. This method saves computing resources and can quickly obtain a motor with low noise.

[0079] On the other hand, the present invention further provides a motor having auxiliary slots and / or auxiliary holes, wherein positions of the auxiliary slots and / or auxiliary holes are determined according to the above-mentioned method for optimizing a motor.

[0080] On the other hand, the present invention also proposes a new energy vehicle, which includes the motor described above; the new energy vehicle is a new energy working vehicle and / or a new energy passenger car. The new energy working vehicle includes but is not limited to a new energy crane, a new energy excavator, a new energy loader, a new energy mixer truck and a new energy tractor, a new energy grader, a new energy rice machine, a new energy corn machine, and a wheat machine.

[0081] On the other hand, the present invention further proposes a machine-readable storage medium, on which instructions are stored, and the instructions are used to enable a machine to execute: according to the method for optimizing a motor.

[0082] A method for optimizing a motor of the present invention includes: constructing an initial finite element model of a target motor; determining the air gap flux density data of the target motor under no-load conditions according to the initial finite element model; determining the position range of the auxiliary slots and / or auxiliary holes of the motor rotor in the target motor according to the air gap flux density data; setting auxiliary slots and / or auxiliary holes on the initial finite element model according to the position range of the auxiliary slots and / or auxiliary holes to obtain a test model; obtaining the current excitation corresponding to the target motor under the test conditions, performing parameter scanning on the test model according to the current excitation to obtain electromagnetic forces of various orders corresponding to the test conditions; and determining the position of the auxiliary slots and / or auxiliary holes of the target motor according to the electromagnetic forces of various orders. The present invention uses different motor conditions and rotor punching topological structure parameters as optimization geometry, quickly screens electromagnetic force sensitive parameters to determine the rotor topology and optimizes the calculation to obtain the position range of the auxiliary slots and / or auxiliary holes, performs parameter scanning to determine the precise position of the auxiliary slots and / or auxiliary holes of the target motor, and saves computing resources and can quickly obtain a motor with low noise.

[0083] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0084] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0085] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0086] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for optimizing a motor, characterized in that: The method includes: Construct an initial finite element model of the target motor; Determining the air gap flux density data of the target motor under no-load condition according to the initial finite element model; Determine the position range of the auxiliary slot and / or auxiliary hole of the motor rotor in the target motor according to the air gap magnetic flux data; According to the position range of the auxiliary grooves and / or auxiliary holes, the initial finite element model is provided with auxiliary grooves and / or auxiliary holes to obtain a test model; Acquire the current excitation corresponding to the target motor under the test condition, and perform parameter scanning on the test model according to the current excitation to obtain electromagnetic forces of various orders corresponding to the test condition; Determining the position of the auxiliary slot and / or auxiliary hole of the target motor according to the electromagnetic forces of each order; The step of determining the position range of the auxiliary slot and / or auxiliary hole of the motor rotor in the target motor according to the air gap magnetic flux data comprises: Determine a distortion region of the air gap radial magnetic density according to the air gap magnetic density data, wherein the distortion region is a region where the air gap magnetic density data deviates from a sine curve threshold range; The auxiliary grooves and / or auxiliary holes are arranged around the distortion area.

2. The method according to claim 1, characterized in that: The initial finite element model of the target motor is constructed, comprising: Acquire the geometric model and setting conditions of the target motor; constructing an initial finite element model according to the geometric model and setting conditions; The initial finite element model is a transient electromagnetic field simulation analysis finite element model.

3. The method according to claim 1, characterized in that The step of determining the air gap flux density data of the target motor under a no-load condition according to the initial finite element model includes: Determine the stator and rotor topology and magnetic steel size of the target motor according to the output characteristics, demagnetization data, back electromotive force and harmonic content of the target motor; The air gap flux density data of the target motor under no-load condition is determined according to the stator-rotor topology structure and the magnetic steel size.

4. The method according to claim 1, characterized in that: The diameter of the auxiliary hole is in the range of 1-2 mm.

5. The method according to claim 1, characterized in that The step of performing parameter scanning on the test model according to the current excitation to obtain electromagnetic forces of various orders corresponding to the test condition includes: Obtaining different speeds and corresponding torques of the target motor under the test condition, wherein the torque includes a constant torque region before the inflection point and a constant power region after the inflection point; Determining a test condition according to the constant torque region and the constant power region; Acquiring a current excitation of the test condition, wherein the current excitation includes a current and a current angle; Performing simulation calculation on the test model to which the current excitation is input to obtain radial electromagnetic force and tangential electromagnetic force on the stator tooth surface; Performing Fourier transform on the radial electromagnetic force and the tangential electromagnetic force to obtain electromagnetic forces of various orders corresponding to the test condition.

6. The method according to claim 1, characterized in that The determining the position of the auxiliary slot and / or auxiliary hole of the target motor according to the electromagnetic forces of each order includes: Obtaining the minimum electromagnetic force of the electromagnetic forces of each order; Grooves and / or holes are formed on the outer surface and / or the interior of the rotor of the target motor according to the auxiliary grooves and / or auxiliary holes corresponding to the minimum electromagnetic force.

7. A device for optimizing a motor, characterized in that: The device includes: A construction module for constructing an initial finite element model of a target motor; A first processing module, configured to determine the air gap flux density data of the target motor under a no-load condition according to the initial finite element model; A second processing module is used to determine the position range of the auxiliary slot and / or auxiliary hole of the motor rotor in the target motor according to the air gap magnetic density data; A third processing module, configured to set auxiliary slots and / or auxiliary holes on the initial finite element model according to the position range of the auxiliary slots and / or auxiliary holes to obtain a test model; A fourth processing module is used to obtain the current excitation corresponding to the target motor under the test condition, and perform parameter scanning on the test model according to the current excitation to obtain electromagnetic forces of various orders corresponding to the test condition; a fifth processing module, configured to determine the position of the auxiliary slot and / or auxiliary hole of the target motor according to the electromagnetic forces of each order; The step of determining the position range of the auxiliary slot and / or auxiliary hole of the motor rotor in the target motor according to the air gap magnetic flux data comprises: Determine a distortion region of the air gap radial magnetic density according to the air gap magnetic density data, wherein the distortion region is a region where the air gap magnetic density data deviates from a sine curve threshold range; The auxiliary grooves and / or auxiliary holes are arranged around the distortion area.

8. A motor, characterized in that: The motor has auxiliary slots and / or auxiliary holes, and positions of the auxiliary slots and / or auxiliary holes are determined according to the method for optimizing a motor according to any one of claims 1 to 6.

9. A new energy vehicle, characterized in that: The new energy vehicle comprises the motor as described in claim 8; The new energy vehicles are new energy working vehicles and / or new energy passenger vehicles.

10. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores instructions for causing a machine to execute: a method for optimizing a motor according to any one of claims 1-6.

Images