Motor cooling oil circuit design method, electronic device, and storage medium

Abstract

The application relates to a motor cooling oil circuit design method, electronic equipment and a storage medium. The motor cooling oil circuit design method comprises the following steps: obtaining a first no-load air gap magnetic flux density of a target rotor axial uniform motor and a second no-load air gap magnetic flux density of a target rotor axial misalignment motor, and obtaining a target value according to the first no-load air gap magnetic flux density and the second no-load air gap magnetic flux density; the target value comprises an air gap magnetic flux density difference value or an air gap magnetic flux density ratio value; the circumferential position of the cooling oil circuit is determined according to the target value; the target radial size of the cooling oil circuit is determined from a preset oil channel radial size range; when the target rotor axial misalignment motor is provided with the cooling oil circuit, the electromagnetic performance of the target rotor axial misalignment motor meets the electromagnetic performance requirement, and the thermal performance of the target rotor axial misalignment motor meets the thermal performance requirement. In this way, the radial size of the cooling oil circuit and the opening position are obtained, the coupling of the electromagnetic performance and the thermal performance is realized, and the overall performance of the motor is improved.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to a design method for motor cooling oil circuits, electronic equipment, and storage medium. Background Technology

[0002] With the continuous increase in the penetration rate of new energy vehicles, the development of drive motors has attracted increasing attention. In new energy vehicles, drive motors need to possess characteristics of high speed, high efficiency, and high power density. Simultaneously, low torque ripple, low noise, vibration, and harshness (NVH) are crucial for ensuring vehicle ride comfort. However, as motor speed and power density continue to increase, heat dissipation has become a core bottleneck restricting performance breakthroughs. Therefore, optimizing the overall performance of motors is of great significance. Summary of the Invention

[0003] In view of this, this application aims to provide a design method for motor cooling oil circuit, electronic equipment and storage medium, which can improve the overall performance of the motor.

[0004] The first aspect of this application provides a design method for an electric motor cooling oil circuit, including: The first unloaded air gap magnetic flux density of the target rotor axially uniform motor and the second unloaded air gap magnetic flux density of the target rotor axially misaligned motor are obtained, and a target value is obtained based on the first unloaded air gap magnetic flux density and the second unloaded air gap magnetic flux density; the target rotor axially misaligned motor is obtained by implementing a rotor skewed pole method on the target rotor axially uniform motor; the target value includes the air gap magnetic flux density difference or the air gap magnetic flux density ratio. Based on the target value, determine the circumferential position of the cooling oil passage; The target radial dimension of the cooling oil circuit is determined from the preset range of radial dimensions of the oil passage; when the target rotor axial misalignment motor is provided with the cooling oil circuit, the electromagnetic performance of the target rotor axial misalignment motor meets the electromagnetic performance requirements, and the thermal performance of the target rotor axial misalignment motor meets the thermal performance requirements.

[0005] Optionally, determining the target radial dimension of the cooling oil passage from a preset range of radial dimensions includes: Based on the first preset search strategy, the current radial dimension of the cooling oil passage is determined from the preset radial dimension range of the oil passage. Based on the circumferential position and the current radial dimension, it is determined whether the current electromagnetic performance of the cooling oil passage meets the electromagnetic performance requirements and whether the current thermal performance of the cooling oil passage meets the thermal performance requirements. If the current electromagnetic performance of the cooling oil circuit does not meet the electromagnetic performance requirements, or the current thermal performance of the cooling oil circuit does not meet the thermal performance requirements, then return to the step of determining the current radial dimension of the cooling oil circuit from the preset oil passage radial dimension range based on the first preset search strategy; if the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements, and the current thermal performance of the cooling oil circuit meets the thermal performance requirements, then determine the current radial dimension as the target radial dimension.

[0006] Optionally, determining whether the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements and whether the current thermal performance of the cooling oil circuit meets the thermal performance requirements based on the circumferential position and the current radial dimension includes: Based on the circumferential position and the current radial dimension, determine whether the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements; If the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements, then it is determined whether the current thermal performance of the cooling oil circuit meets the thermal performance requirements.

[0007] Optionally, determining whether the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements based on the circumferential position and the current radial dimension includes: Based on the circumferential position and the current radial dimension, the ratio of the magnetic permeability difference to the oil passage magnetic barrier function is calculated to obtain the waveform of the magnetic permeability difference function after the magnetic barrier is opened in the target rotor axial misalignment motor; The rotor topology of the target rotor axial misalignment motor is determined based on the waveform of the magnetic permeability difference function, and the electromagnetic performance simulation parameters of the rotor topology are obtained. Check whether the electromagnetic performance simulation parameters are within the range of standard electromagnetic performance parameters; If the electromagnetic performance simulation parameters are within the range of the standard electromagnetic performance parameters, then the current electromagnetic performance of the cooling oil circuit is determined to meet the electromagnetic performance requirements; if the electromagnetic performance simulation parameters are not within the range of the standard electromagnetic performance parameters, then the current electromagnetic performance of the cooling oil circuit is determined to not meet the electromagnetic performance requirements.

[0008] Optionally, determining whether the current thermal performance of the cooling oil circuit meets the thermal performance requirements includes: Obtain the thermal performance simulation parameters of the rotor topology; Check whether the simulated thermal performance parameters are within the range of standard thermal performance parameters; If the thermal performance simulation parameters are within the range of the standard thermal performance parameters, then the current thermal performance of the cooling oil circuit is determined to meet the thermal performance requirements; if the thermal performance simulation parameters are not within the range of the standard thermal performance parameters, then the current thermal performance of the cooling oil circuit is determined to not meet the thermal performance requirements.

[0009] Optionally, obtaining the first no-load air gap magnetic flux density of the target rotor axially uniform motor and the second no-load air gap magnetic flux density of the target rotor axially misaligned motor includes: Obtain the first no-load air gap magnetic flux density of the target rotor axially uniform motor; Based on the second preset search strategy, the current skew angle is determined from the preset skew angle range. Based on the target rotor axial uniform motor and the current skew angle, the first rotor axial misaligned motor is obtained, and it is detected whether the motor noise value of the first rotor axial misaligned motor is less than a preset noise value. If the motor noise value of the first rotor axial misaligned motor is greater than or equal to the preset noise value, the step of determining the current skew angle from the preset skew angle range is returned. If the motor noise value of the first rotor axial misaligned motor is less than the preset noise value, the first rotor axial misaligned motor is determined to be the target rotor axial misaligned motor, and the second no-load air gap magnetic flux density of the target rotor axial misaligned motor is obtained.

[0010] Optionally, obtaining the first no-load air gap magnetic flux density of the target rotor axially uniform motor and the second no-load air gap magnetic flux density of the target rotor axially misaligned motor includes: Obtain the first no-load air gap magnetic flux density of the target rotor axially uniform motor; All test skew angles are determined from the preset skew angle range; based on the target rotor axial uniform motor and each of the test skew angles, the corresponding second rotor axial misalignment motors are determined; the motor noise value of the second rotor axial misalignment motor is less than the preset noise value; Among the various second rotor axial misalignment motors, the second rotor axial misalignment motor with the lowest motor noise value is determined as the target rotor axial misalignment motor, and the second no-load air gap magnetic flux density of the target rotor axial misalignment motor is obtained.

[0011] Optionally, obtaining the target value based on the first empty air gap magnetic flux density and the second empty air gap magnetic flux density includes: The difference between the first unloaded air gap magnetic flux density and the second unloaded air gap magnetic flux density is calculated to obtain the air gap magnetic flux density difference value; Alternatively, the ratio of the first unloaded air gap magnetic flux density to the second unloaded air gap magnetic flux density can be calculated to obtain the air gap magnetic flux density ratio.

[0012] A second aspect of this application provides an electronic device, comprising: A processor, and a memory connected to the processor; The memory is used to store computer programs; The processor is used to call and execute the computer program in the memory to perform the design method of the motor cooling oil circuit as described in the first aspect of this application.

[0013] A third aspect of this application provides a storage medium, comprising: the storage medium storing a computer program, which, when executed by a processor, implements the various steps of the design method for the motor cooling oil circuit as described in the first aspect of this application.

[0014] In the technical solution of this application, the first no-load air gap magnetic flux density of the target rotor axially uniform motor and the second no-load air gap magnetic flux density of the target rotor axially misaligned motor are obtained, and a target value is obtained based on the first and second no-load air gap magnetic flux densities. The target rotor axially misaligned motor is obtained by implementing a rotor skew method on the target rotor axially uniform motor. The target value includes the air gap magnetic flux density difference or air gap magnetic flux density ratio. Based on the target value, the circumferential position of the cooling oil circuit is determined. The target radial dimension of the cooling oil circuit is determined from a preset range of radial dimensions of the oil passage. When the target rotor axially misaligned motor has a cooling oil circuit, the electromagnetic performance of the target rotor axially misaligned motor meets the electromagnetic performance requirements, and the thermal performance of the target rotor axially misaligned motor meets the thermal performance requirements. Thus, in the design process of the cooling oil circuit, starting from the analysis of electromagnetic performance, the cooling effect is considered in conjunction with the determination of the radial dimension and the location of the cooling oil circuit. At the same time, the coupling of electromagnetic performance and thermal performance is achieved, reducing the magnetic flux non-uniformity caused by rotor segmentation and skew, significantly improving the cooling effect of the motor, and thus improving the overall performance of the motor. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart illustrating a design method for an electric motor cooling oil circuit according to an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the structure of a motor rotor lamination provided in one embodiment of this application.

[0018] Figure 3 This is a schematic diagram of the structure of silicon steel laminations in an electric motor according to one embodiment of this application.

[0019] Figure 4 This is a waveform comparison diagram of a first unloaded air gap magnetic flux density and a second unloaded air gap magnetic flux density provided in an embodiment of this application.

[0020] Figure 5 This is a waveform diagram illustrating the difference between a first unloaded air gap magnetic flux density and a second unloaded air gap magnetic flux density provided in one embodiment of this application.

[0021] Figure 6 This is a schematic diagram of a structure for opening a cooling oil passage provided in one embodiment of this application.

[0022] Figure 7 This is a schematic diagram of the structure of an electronic device provided in one embodiment of this application. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] With the development of new energy technologies, the new energy vehicle industry has experienced explosive growth, with market penetration continuing to climb, placing increasingly stringent demands on the performance of drive motors. High speed, high efficiency, and high power density have become core technical indicators for drive motors, directly determining the vehicle's power response, driving range, and energy utilization efficiency; while low torque pulsation and low NVH are key to ensuring ride comfort and enhancing product market competitiveness, and are also important technical barriers for high-end new energy vehicles.

[0025] However, with the continuous increase in motor speed and power density, electromagnetic and thermal loads are also increasing rapidly, and heat dissipation has become a core bottleneck restricting breakthroughs in motor performance. Traditional heat dissipation solutions are difficult to adapt to high power density conditions and are prone to causing localized overheating of key components such as stator windings and rotor magnets. This not only accelerates the aging of insulation materials and causes irreversible demagnetization of permanent magnets, reducing motor efficiency and service life, but may also induce safety hazards such as thermal runaway, severely limiting the upper limit of motor performance.

[0026] The inventors discovered that current mainstream technologies in the industry often employ a combination of segmented rotor skewed poles and auxiliary slots on the rotor surface. By optimizing electromagnetic harmonic distribution, this effectively suppresses torque pulsation and vibration noise, significantly improving NVH performance. Simultaneously, integrated liquid cooling systems (such as stator oil cooling, rotor internal cooling, and housing water cooling) enhance thermal management and alleviate heat dissipation pressure. However, existing technologies generally suffer from design fragmentation; electromagnetic and thermal designs are conducted independently, lacking multi-physics collaborative analysis and coupled optimization. This makes it difficult to achieve optimal matching of electromagnetic performance, heat dissipation efficiency, and NVH characteristics, often resulting in conflicts between electromagnetic optimization and heat dissipation requirements, and imbalances between NVH improvement and thermal efficiency, thus hindering further improvements in the overall performance of drive motors.

[0027] Therefore, embodiments of this application provide a design method for motor cooling oil circuits, which opens the cooling oil circuits based on a comprehensive consideration of electromagnetic and thermal performance, breaking through the electromagnetic-multi-physics field collaborative design technology, and achieving a two-way improvement in performance and reliability.

[0028] Specifically, such as Figure 1 As shown, the design method for motor cooling oil circuits can include at least the following steps: S101. Obtain the first unloaded air gap magnetic flux density of the target rotor axial uniform motor and the second unloaded air gap magnetic flux density of the target rotor axial misaligned motor, and obtain the target value based on the first unloaded air gap magnetic flux density and the second unloaded air gap magnetic flux density; the target rotor axial misaligned motor is obtained by implementing the rotor skew method on the target rotor axial uniform motor; the target value includes the air gap magnetic flux density difference or the air gap magnetic flux density ratio.

[0029] In implementation, the target rotor axial uniform motor can be determined first. The specific parameters of the target rotor axial uniform motor can be set according to actual needs and are not specifically limited here. After determining the target rotor axial uniform motor, the first no-load air gap magnetic flux density of the target rotor axial uniform motor can be extracted. Simultaneously, based on the target rotor axial uniform motor, a rotor skew method is implemented to obtain the target rotor axial misaligned motor, and the second no-load air gap magnetic flux density of the target rotor axial misaligned motor is extracted.

[0030] The no-load air gap magnetic flux density refers to the magnetic induction intensity distributed along the circumference in the air gap between the stator and rotor under the condition that the permanent magnet of the motor rotor is energized alone and the stator winding is not energized (no load).

[0031] Specifically, when extracting the first unloaded air gap magnetic flux density of a target rotor axially uniform motor, the air gap magnetic flux density of a complete circumference can be extracted as needed. Alternatively, since the target rotor axially uniform motor is an axially uniform and magnetically symmetrical motor, a pair of pole air gap magnetic flux density can also be extracted. Extracting the complete circumference air gap magnetic flux density means extracting the air gap magnetic flux density distribution along the stator inner circle or the air gap center in a complete 360° cycle, and defining the resulting air gap magnetic flux density distribution as the first unloaded air gap magnetic flux density. Extracting a pair of pole air gap magnetic flux density means extracting the air gap magnetic flux density distribution within only one complete magnetic pole cycle (i.e., 360° / number of pole pairs, for example, 90° for 4 pole pairs), and defining the resulting air gap magnetic flux density distribution as the first unloaded air gap magnetic flux density. Similarly, when extracting the second unloaded air gap magnetic flux density of a target rotor axially misaligned motor, the same method can be used.

[0032] After obtaining the first and second unloaded air gap magnetic flux densities, the difference between the first and second unloaded air gap magnetic flux densities can be calculated to obtain the target value; or the ratio of the first and second unloaded air gap magnetic flux densities can be calculated to obtain the target value, thus providing a reference for finding the optimal location for the cooling oil circuit.

[0033] S102. Determine the circumferential position of the cooling oil circuit based on the target value.

[0034] Specifically, the circumferential position of the cooling oil passage can be determined based on the difference or ratio between the magnetic flux density of the first unloaded air gap and the magnetic flux density of the second unloaded air gap.

[0035] The following section uses a 6-pole rotor as an example to explain in detail how to determine the circumferential position of the cooling oil passages: like Figure 2 The diagram shows the structure of a motor rotor lamination, which includes a first magnet slot 1, a second magnet slot 2, a first elliptical auxiliary slot 3, a second elliptical auxiliary slot 4, a third magnet slot 5, a fourth magnet slot 6, a first weight-reducing hole 7, a second weight-reducing hole 8, and a fastening point 9. The six sets of motor rotor laminations are evenly distributed along the circumference. The first and second magnet slots 1 and 2, as well as the third and fourth magnet slots 5 and 6, are symmetrical about axis A. Without implementing the segmented skewed pole method, the motor axial direction remains consistent.

[0036] The motor rotor axial length is set at 145mm (this value can be increased or decreased according to requirements). A 6-segment uniformly graded design is adopted, with the mechanical angles of axial misalignment of the six motor rotor laminations being -2.5°, 0°, 2.5°, 2.5°, 0°, and -2.5° respectively, forming a "V"-shaped misalignment in the axial direction to suppress torque pulsation. After implementing the segmented skewed rotor design, the silicon steel lamination state between segments is as follows... Figure 3As shown, region a is the region where the upper stacked large magnet groove contacts the lower stacked silicon steel groove; region b is the region where the upper stacked large magnet groove contacts the lower stacked large magnet groove; region c is the region where the upper stacked magnet contacts the lower stacked large magnet groove; region d is the region where the upper stacked small magnet groove contacts the lower stacked silicon steel groove; region e is the region where the upper stacked small magnet groove contacts the lower stacked small magnet groove; and region f is the region where the upper stacked silicon steel contacts the lower stacked small magnet groove. Furthermore, regions a and f, regions b and e, and regions c and d are all symmetrical about axis B.

[0037] A Cartesian coordinate system is constructed with the location of the N-S pole junction of the permanent magnet as the origin, where the x-axis represents the circumferential angle and the y-axis represents the unloaded air gap magnetic flux density. For example... Figure 4 The image shows a waveform comparison of the first and second unloaded air gap magnetic flux densities. From... Figure 4 As can be seen, the segmented skewed poles of the rotor have a significant impact on the air gap magnetic flux density. Furthermore, the region primarily affected by the no-load air gap magnetic flux density is... Figure 3 Regions a, c, d, and f are shown. Further, the target value is obtained by subtracting the first and second air gap magnetic flux densities; the waveform of the target value is shown below. Figure 5 As shown. Among them, Figure 5 The wave crest regions on the left correspond to regions a, b, and c; the wave crest regions on the right correspond to regions d, e, and f. From... Figure 5 As can be seen from this, the main region affecting the air gap magnetic flux density is Figure 3 The diagram shows regions a, b, and c, and their symmetrical regions (i.e., regions d, e, and f). However, regions b and e are overlapping areas of the upper and lower magnet slots, which have no effect on the motor's magnetic flux density. Therefore, the key region ultimately affecting the magnetic flux density is... Figure 3 Regions a, c, d, and f are shown. Therefore, the circumferential position regions corresponding to each peak region are the selectable circumferential position regions corresponding to each cooling oil passage.

[0038] In other words, when determining the circumferential position of the cooling oil passage based on the target value, the circumferential position of the cooling oil passage can be selected from the circumferential angle range corresponding to the peak region in the waveform diagram of the target value. The specific numerical value of the circumferential position of the cooling oil passage can be selected from the circumferential angle range corresponding to the peak region based on the actual rotor topology; no specific limitations are made here.

[0039] S103. Determine the target radial dimension of the cooling oil circuit from the preset oil circuit radial dimension range; when the target rotor axial misalignment motor has a cooling oil circuit, the electromagnetic performance of the target rotor axial misalignment motor meets the electromagnetic performance requirements, and the thermal performance of the target rotor axial misalignment motor meets the thermal performance requirements.

[0040] During implementation, the preset radial dimension range of the oil passage can be set according to the actual rotor lamination requirements and the thickness of a single layer of silicon steel sheet; no specific limitation is made here. For example, if the thickness of a single layer of silicon steel sheet is 0.25mm, and the cooling oil passage can be opened within the range of 2-6 layers of silicon steel sheet stacking, then the preset radial dimension range of the oil passage can be determined to be 0.5mm-1.5mm.

[0041] The cross-section of the cooling oil passage can be rectangular, and correspondingly, the target radial dimension is the length and width of the cooling oil passage cross-section.

[0042] During implementation, a test radial dimension can be selected from the preset oil passage radial dimensions. Based on this test radial dimension, the electromagnetic and thermal performance of the target rotor axial misalignment motor with corresponding cooling oil passages can be tested to determine whether its electromagnetic performance meets the requirements and whether its thermal performance meets the requirements. If both electromagnetic and thermal performance meet the requirements, the test radial dimension is determined as the target radial dimension; otherwise, a new test radial dimension is selected for electromagnetic and thermal performance testing.

[0043] In this embodiment, the first unloaded air gap magnetic flux density of the target rotor axially uniform motor and the second unloaded air gap magnetic flux density of the target rotor axially misaligned motor are obtained, and a target value is obtained based on the first and second unloaded air gap magnetic flux densities. The target rotor axially misaligned motor is obtained by implementing a rotor skew method on the target rotor axially uniform motor. The target value includes the air gap magnetic flux density difference or air gap magnetic flux density ratio. Based on the target value, the circumferential position of the cooling oil circuit is determined. The target radial dimension of the cooling oil circuit is determined from a preset range of radial dimensions of the oil passage. When the target rotor axially misaligned motor has a cooling oil circuit, the electromagnetic performance of the target rotor axially misaligned motor meets the electromagnetic performance requirements, and the thermal performance of the target rotor axially misaligned motor meets the thermal performance requirements. Thus, in the design process of the cooling oil circuit, starting from the analysis of electromagnetic performance, the cooling effect is considered in conjunction with the determination of the radial dimension and the location of the cooling oil circuit. At the same time, the coupling of electromagnetic performance and thermal performance is achieved, reducing the magnetic flux non-uniformity caused by rotor segmentation and skew, significantly improving the cooling effect of the motor, and thus improving the overall performance of the motor.

[0044] In some embodiments, in step S103, when determining the target radial dimension of the cooling oil path from the preset radial dimension range of the oil path, the current radial dimension of the cooling oil path can be determined from the preset radial dimension range of the oil path based on a first preset search strategy. Based on the circumferential position and the current radial dimension, it can be determined whether the current electromagnetic performance of the cooling oil path meets the electromagnetic performance requirements and whether the current thermal performance of the cooling oil path meets the thermal performance requirements. If the current electromagnetic performance of the cooling oil path does not meet the electromagnetic performance requirements or the current thermal performance of the cooling oil path does not meet the thermal performance requirements, the process returns to the step of determining the current radial dimension of the cooling oil path from the preset radial dimension range of the oil path based on the first preset search strategy. If the current electromagnetic performance of the cooling oil path meets the electromagnetic performance requirements and the current thermal performance of the cooling oil path meets the thermal performance requirements, the current radial dimension is determined as the target radial dimension.

[0045] During implementation, the first preset search strategy can be set according to actual needs, without specific limitations here. For example, the first preset search strategy can be a linear search method, a heuristic search, a genetic algorithm, etc.

[0046] Specifically, after determining the circumferential position, the current radial dimension of the cooling oil passage can be selected from a preset range of radial dimensions. For example, if the cross-section of the cooling oil passage is rectangular, a length of 1.2 mm and a width of 0.8 mm can be selected from [0.5 mm - 1.5 mm] according to the first preset search strategy. Based on this, the current electromagnetic performance of the cooling oil passage and the determined current radial dimension can be used to detect whether they meet the electromagnetic performance requirements and whether they meet the thermal performance requirements, thus providing data support for determining whether the current circumferential position and current radial dimension can improve motor performance.

[0047] If the current electromagnetic performance of the cooling oil circuit does not meet the electromagnetic performance requirements, it indicates that the current radial dimension hinders the improvement of the motor's electromagnetic performance. In this case, the process can return to the step of determining the current radial dimension of the cooling oil circuit from the preset range of oil circuit radial dimensions based on the first preset search strategy, thus reselecting a new current radial dimension and laying the foundation for finding a radial dimension that meets the electromagnetic performance requirements. Similarly, if the current thermal performance of the cooling oil circuit does not meet the thermal performance requirements, it indicates that the current radial dimension hinders the improvement of the motor's thermal performance. Again, the process can return to the step of determining the current radial dimension of the cooling oil circuit from the preset range of oil circuit radial dimensions based on the first preset search strategy, thus reselecting a new current radial dimension and laying the foundation for finding a radial dimension that meets the thermal performance requirements. If the current electromagnetic performance of the cooling oil circuit meets both the electromagnetic and thermal performance requirements, it indicates that the current radial dimension setting allows the motor to meet both electromagnetic and thermal performance requirements, achieving a synergistic effect between electromagnetic and thermal performance. In this case, there is no need to continue searching for a new current radial dimension, and the current radial dimension can be determined as the target radial dimension.

[0048] Thus, through electromagnetic and thermal performance analysis, electromagnetic design and thermal management can be coordinated, reducing the radial magnetic field inhomogeneity caused by rotor segmentation and skewed poles, while achieving efficient cooling of the motor rotor, thereby improving the overall performance of the motor.

[0049] In some implementations, in order to save on the computational power required by the system, when determining whether the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements and whether the current thermal performance of the cooling oil circuit meets the thermal performance requirements based on the circumferential position and the current radial dimension, the current electromagnetic performance of the cooling oil circuit can be determined based on the circumferential position and the current radial dimension; if the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements, then the current thermal performance of the cooling oil circuit is determined to meet the thermal performance requirements.

[0050] During implementation, the electromagnetic performance of the cooling oil passages can be analyzed first, and only after the current electromagnetic performance meets the requirements can the thermal performance of the cooling oil passages be analyzed. This avoids performing thermal performance analysis and calculations when the current electromagnetic performance does not meet the requirements, thereby reducing the computational burden on the system.

[0051] The embodiments in this application are merely examples of first determining whether the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements. However, this application is not limited to this. In some other embodiments, it is also possible to simultaneously determine whether the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements and whether the current thermal performance of the cooling oil circuit meets the thermal performance requirements; or, first determine whether the current thermal performance of the cooling oil circuit meets the thermal performance requirements, and then determine whether the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements when the current thermal performance of the cooling oil circuit meets the thermal performance requirements.

[0052] In some implementations, when determining whether the electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements based on the circumferential position and the current radial dimension, the ratio of the permeability difference to the oil passage magnetic barrier function can be calculated based on the circumferential position and the current radial dimension to obtain the waveform of the permeability difference function after the magnetic barrier is opened in the target rotor axial misalignment motor. Then, based on the waveform of the permeability difference function, the rotor topology of the target rotor axial misalignment motor is determined, and the electromagnetic performance simulation parameters of the rotor topology are obtained. It is then checked whether the electromagnetic performance simulation parameters are within the standard electromagnetic performance parameter range. If the electromagnetic performance simulation parameters are within the standard electromagnetic performance parameter range, it is determined that the electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements; if the electromagnetic performance simulation parameters are not within the standard electromagnetic performance parameter range, it is determined that the electromagnetic performance of the cooling oil circuit does not meet the electromagnetic performance requirements.

[0053] During implementation, the magnetic permeability difference ΔΛ can be calculated based on the magnetomotive force F of the permanent magnet. Using the circumferential position θ, the length u, and the width v in the current radial dimension, the oil passage magnetic barrier function FΛ(θ, u, v) can be determined. This allows for the calculation of the ratio of the magnetic permeability difference ΔΛ to the oil passage magnetic barrier function FΛ(θ, u, v), thus obtaining the waveform of the magnetic permeability difference function after the magnetic barrier is established. Based on this waveform, the rotor topology after the oil passage magnetic barrier is established can be obtained. After simulating this rotor topology, the electromagnetic performance simulation parameters of the rotor topology are obtained. Based on the standard electromagnetic performance parameter range, it is determined whether the electromagnetic performance simulation parameters of the rotor topology meet the requirements, thus judging whether the current electromagnetic performance meets the electromagnetic performance requirements. The electromagnetic performance simulation parameters of the rotor topology can include: speed, torque, efficiency, etc. The specific standard electromagnetic performance parameter range can be set according to actual needs and is not specifically limited here. If the electromagnetic performance simulation parameters of each rotor topology are all within the corresponding standard electromagnetic performance parameter range, then the electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements; conversely, if any electromagnetic performance simulation parameter is not within the corresponding standard electromagnetic performance parameter range, then the electromagnetic performance of the cooling oil circuit does not meet the electromagnetic performance requirements.

[0054] The specific processes for determining the magnetic permeability difference and the oil passage magnetic barrier function can be referred to existing related technologies, and will not be elaborated here.

[0055] In some implementations, when determining whether the current thermal performance of the cooling oil circuit meets the thermal performance requirements, the thermal performance simulation parameters of the rotor topology can be obtained; it can be detected whether the thermal performance simulation parameters are within the standard thermal performance parameter range; if the thermal performance simulation parameters are within the standard thermal performance parameter range, it is determined that the current thermal performance of the cooling oil circuit meets the thermal performance requirements; if the thermal performance simulation parameters are not within the standard thermal performance parameter range, it is determined that the current thermal performance of the cooling oil circuit does not meet the thermal performance requirements.

[0056] During implementation, the thermal performance simulation parameters of the rotor topology can include single-hole coolant flow rate, specific heat capacity, and thermal conductivity.

[0057] The circumferential position θ, the length u, and the width v in the current radial dimension affect the position and cross-sectional area of ​​the cooling oil passages, thus influencing the coolant flow rate. Furthermore, the single-hole coolant flow rate Vflow is also affected by the rotational speed n, the rotor radius r, and the coolant parameter Kliquid. The coolant parameter Kliquid is primarily determined by the dynamic viscosity of the coolant. Once the single-hole coolant flow rate Vflow is determined, the motor's thermal performance is assessed by combining it with other coolant parameters such as specific heat capacity and thermal conductivity. The standard thermal performance parameter range can be set according to actual needs and is not specifically limited here.

[0058] If any thermal performance simulation parameter is outside the corresponding standard thermal performance parameter range, the current radial dimensions (length u and width v) are modified, meaning the cooling oil passage design is redone. If all thermal performance simulation parameters are within the corresponding standard thermal performance parameter range, the current thermal performance of the cooling oil passage meets the requirements. Furthermore, since the current electromagnetic performance of the cooling oil passage meets the electromagnetic performance requirements, the current cooling oil passage achieves coupling between electromagnetic and thermal performance, allowing for the design of the winding slot guide channel topology. The winding slot guide channel directs the incoming coolant to the motor coolant collection port, and its topology parameters are mainly affected by parameters such as the motor slot opening, air gap thickness, coolant dynamic viscosity, coolant flow rate, and motor axial length.

[0059] In practical applications, magnetic flux density distortion is one of the core causes of noise, vibration, and losses in motors. Magnetic flux density distortion mainly occurs between segments of the segmented skewed poles. Therefore, cooling oil channels are located at the contact surfaces of the segmented skewed poles, and these channels are created by slotting the silicon steel sheets on the contact surface. For example... Figure 6 The diagram shows a schematic of the cooling oil passages created based on magnetic flux density analysis. Figure 6 S1 is a schematic diagram of the stacking of a complete magnetic steel sheet and a slotted silicon steel sheet with an open cooling oil channel on the left. The line on the left side of the oil channel is the boundary of the complete silicon steel sheet, and the line on the right side of the oil channel is the boundary of the slotted steel sheet. Figure 6Figure S2 shows a schematic diagram of the stacked complete magnetic steel sheet and slotted silicon steel sheet with open cooling oil channels on the right side. The line on the right side of the oil channel represents the boundary of the complete silicon steel sheet, and the line on the left side represents the boundary of the slotted steel sheet. The cooling oil channel mainly consists of the following parts: m1 - oil slinger; m2 - permanent magnet cooling oil channel; m3 - stress relief chamfer; m4 - oil inlet. To avoid direct contact between the coolant and the magnetic steel and silicon steel, causing corrosion, an isolation barrier is installed on the inner wall of the oil channel. Furthermore, to ensure the mechanical strength of the silicon steel sheet, the magnetic barrier oil channels on the left and right sides are respectively located at the interface of different inclined pole sections.

[0060] The design of the cooling oil channel enables direct cooling of the permanent magnet, while reducing the distortion of the air gap magnetic flux density, thus achieving a synergistic effect between electromagnetic design and thermal management.

[0061] In some implementations, when acquiring the first unloaded air gap magnetic flux density of the target rotor axial uniform motor and the second unloaded air gap magnetic flux density of the target rotor axial misaligned motor, the first unloaded air gap magnetic flux density of the target rotor axial uniform motor can be acquired first; then, based on a second preset search strategy, the current slant angle is determined from a preset slant angle range; based on the target rotor axial uniform motor and the current slant angle, the first rotor axial misaligned motor is obtained, and it is detected whether the motor noise value of the first rotor axial misaligned motor is less than a preset noise value; if the motor noise value of the first rotor axial misaligned motor is greater than or equal to the preset noise value, the step of determining the current slant angle from the preset slant angle range is returned; if the motor noise value of the first rotor axial misaligned motor is less than the preset noise value, the first rotor axial misaligned motor is determined to be the target rotor axial misaligned motor, and the second unloaded air gap magnetic flux density of the target rotor axial misaligned motor is acquired.

[0062] The second preset search strategy can be set according to actual needs, and no specific limitation is made here. For example, the second preset search strategy can be a linear search method, a heuristic search, a genetic algorithm, etc.

[0063] During implementation, the preset tilt angle range and preset noise value can be set according to actual needs, and no specific limitations are made here.

[0064] By determining whether the motor noise value is less than the preset noise value, it is possible to detect whether the skew pole angle corresponding to the current first rotor axial misalignment motor meets the NVH performance requirements, thus laying the foundation for ensuring the NVH performance of the target rotor axial misalignment motor.

[0065] In specific implementation, in order to further improve the NVH performance of the target rotor axial misalignment motor, the above-mentioned acquisition of the first no-load air gap magnetic flux density of the target rotor axial uniform motor and the second no-load air gap magnetic flux density of the target rotor axial misalignment motor can be achieved by: acquiring the first no-load air gap magnetic flux density of the target rotor axial uniform motor; determining all test slant pole angles within a preset slant pole angle range; determining the corresponding second rotor axial misalignment motor based on the target rotor axial uniform motor and each test slant pole angle; ensuring that the motor noise value of the second rotor axial misalignment motor is less than a preset noise value; and identifying the second rotor axial misalignment motor with the lowest motor noise value among all the second rotor axial misalignment motors as the target rotor axial misalignment motor, and acquiring the second no-load air gap magnetic flux density of the target rotor axial misalignment motor.

[0066] In this way, the rotor axial misalignment motor with the best NVH performance can be selected from multiple second rotor axial misalignment motors that meet the NVH performance requirements as the target rotor axial misalignment motor, thus providing a guarantee for the subsequent accurate and efficient design of cooling oil channels that simultaneously meet electromagnetic and thermal performance requirements.

[0067] As another optional implementation of the disclosure of this application, embodiments of this application also provide a design device for a motor cooling oil circuit. This device may include at least: an acquisition module, used to acquire the first no-load air gap magnetic flux density of a target rotor axially uniform motor and the second no-load air gap magnetic flux density of a target rotor axially misaligned motor, and to obtain a target value based on the first and second no-load air gap magnetic flux densities; the target rotor axially misaligned motor is obtained by implementing a rotor skew method on the target rotor axially uniform motor; the target value includes the air gap magnetic flux density difference or the air gap magnetic flux density ratio; a first determination module, used to determine the circumferential position of the cooling oil circuit based on the target value; a second determination module, used to determine the target radial dimension of the cooling oil circuit from a preset range of radial dimensions of the oil passage; when the target rotor axially misaligned motor has a cooling oil circuit, the electromagnetic performance of the target rotor axially misaligned motor meets the electromagnetic performance requirements, and the thermal performance of the target rotor axially misaligned motor meets the thermal performance requirements.

[0068] Optionally, when determining the target radial dimension of the cooling oil path from the preset range of radial dimensions of the oil path, the second determining module may specifically be used to: determine the current radial dimension of the cooling oil path from the preset range of radial dimensions of the oil path based on the first preset search strategy, and determine whether the current electromagnetic performance of the cooling oil path meets the electromagnetic performance requirements and whether the current thermal performance of the cooling oil path meets the thermal performance requirements based on the circumferential position and the current radial dimension; if the current electromagnetic performance of the cooling oil path does not meet the electromagnetic performance requirements, or the current thermal performance of the cooling oil path does not meet the thermal performance requirements, then return to the step of determining the current radial dimension of the cooling oil path from the preset range of radial dimensions of the oil path based on the first preset search strategy; if the current electromagnetic performance of the cooling oil path meets the electromagnetic performance requirements and the current thermal performance of the cooling oil path meets the thermal performance requirements, then determine the current radial dimension as the target radial dimension.

[0069] Optionally, when determining whether the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements and whether the current thermal performance of the cooling oil circuit meets the thermal performance requirements based on the circumferential position and the current radial dimension, the second determining module may specifically be used to: determine whether the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements based on the circumferential position and the current radial dimension; if the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements, then determine whether the current thermal performance of the cooling oil circuit meets the thermal performance requirements.

[0070] Optionally, when determining whether the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements based on the circumferential position and the current radial dimension, the second determining module can be specifically used to: calculate the ratio of the magnetic permeability difference to the oil passage magnetic barrier function based on the circumferential position and the current radial dimension, and obtain the waveform of the magnetic permeability difference function after the magnetic barrier is opened in the target rotor axial misalignment motor; determine the rotor topology of the target rotor axial misalignment motor based on the magnetic permeability difference function waveform, and obtain the electromagnetic performance simulation parameters of the rotor topology; detect whether the electromagnetic performance simulation parameters are within the standard electromagnetic performance parameter range; if the electromagnetic performance simulation parameters are within the standard electromagnetic performance parameter range, then determine that the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements; if the electromagnetic performance simulation parameters are not within the standard electromagnetic performance parameter range, then determine that the current electromagnetic performance of the cooling oil circuit does not meet the electromagnetic performance requirements.

[0071] Optionally, when determining whether the current thermal performance of the cooling oil circuit meets the thermal performance requirements, the second determining module may be used to: obtain the thermal performance simulation parameters of the rotor topology; detect whether the thermal performance simulation parameters are within the standard thermal performance parameter range; if the thermal performance simulation parameters are within the standard thermal performance parameter range, then determine that the thermal performance of the cooling oil circuit meets the thermal performance requirements; if the thermal performance simulation parameters are not within the standard thermal performance parameter range, then determine that the current thermal performance of the cooling oil circuit does not meet the thermal performance requirements.

[0072] Optionally, when acquiring the first unloaded air gap magnetic flux density of the target rotor axial uniform motor and the second unloaded air gap magnetic flux density of the target rotor axial misaligned motor, the acquisition module may specifically be used to: acquire the first unloaded air gap magnetic flux density of the target rotor axial uniform motor; determine the current slant angle from a preset slant angle range based on a second preset search strategy; obtain the first rotor axial misaligned motor based on the target rotor axial uniform motor and the current slant angle; and detect whether the motor noise value of the first rotor axial misaligned motor is less than a preset noise value; if the motor noise value of the first rotor axial misaligned motor is greater than or equal to the preset noise value, then return to the step of determining the current slant angle from the preset slant angle range; if the motor noise value of the first rotor axial misaligned motor is less than the preset noise value, then determine the first rotor axial misaligned motor as the target rotor axial misaligned motor, and acquire the second unloaded air gap magnetic flux density of the target rotor axial misaligned motor.

[0073] Optionally, when acquiring the first unloaded air gap magnetic flux density of the target rotor axial uniform motor and the second unloaded air gap magnetic flux density of the target rotor axial misaligned motor, the acquisition module can also be used to: acquire the first unloaded air gap magnetic flux density of the target rotor axial uniform motor; determine all test slant pole angles from a preset slant pole angle range; determine the corresponding second rotor axial misaligned motor based on the target rotor axial uniform motor and each test slant pole angle; the motor noise value of the second rotor axial misaligned motor is less than a preset noise value; determine the second rotor axial misaligned motor with the smallest motor noise value among all the second rotor axial misaligned motors as the target rotor axial misaligned motor, and acquire the second unloaded air gap magnetic flux density of the target rotor axial misaligned motor.

[0074] Optionally, when obtaining the target value based on the first unloaded air gap magnetic flux density and the second unloaded air gap magnetic flux density, the acquisition module can be specifically used to: calculate the difference between the first unloaded air gap magnetic flux density and the second unloaded air gap magnetic flux density to obtain the air gap magnetic flux density difference value; or, calculate the ratio of the first unloaded air gap magnetic flux density and the second unloaded air gap magnetic flux density to obtain the air gap magnetic flux density ratio value.

[0075] Specifically, the limitations of the design device for the motor cooling oil circuit can be found in the limitations of the design method for the motor cooling oil circuit mentioned above, and will not be repeated here. Each module in the aforementioned design device for the motor cooling oil circuit can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0076] As another optional implementation of the disclosure of this application, embodiments of this application also provide an electronic device, such as... Figure 7As shown, the electronic device may include: a memory 701 and a processor 702; wherein, the memory 701 is connected to the processor 702 and is used to store programs; the processor 702 is used to implement the design method of the motor cooling oil circuit disclosed in any of the above embodiments by running the programs stored in the memory 701.

[0077] Specifically, the aforementioned electronic device may also include: a bus, a communication interface 703, an input device 704, and an output device 705.

[0078] The processor 702, memory 701, communication interface 703, input device 704, and output device 705 are interconnected via a bus. Among them: A bus can include a pathway for transmitting information between various components of a computer system.

[0079] The processor 702 can be a general-purpose processor, such as a general-purpose central processing unit (CPU), a microprocessor, etc., or an application-specific integrated circuit (ASIC), or one or more integrated circuits used to control the execution of the program of the present application. It can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0080] Processor 702 may include a main processor, as well as a baseband chip, modem, etc.

[0081] The memory 701 stores a program for executing the technical solution of this application, and may also store an operating system and other key business functions. Specifically, the program may include program code, which includes computer operation instructions. More specifically, the memory 701 may include read-only memory (ROM), other types of static storage devices capable of storing static information and instructions, random access memory (RAM), other types of dynamic storage devices capable of storing information and instructions, disk storage, flash memory, etc.

[0082] Input device 704 may include a device for receiving data and information input by a user, such as a keyboard, mouse, camera, scanner, light pen, voice input device, touch screen, pedometer, or gravity sensor.

[0083] Output device 705 may include devices that allow information to be output to a user, such as a display screen, printer, speaker, etc.

[0084] The communication interface 703 may include a device that uses any transceiver to communicate with other devices or communication networks, such as Ethernet, Radio Access Network (RAN), Wireless Local Area Network (WLAN), etc.

[0085] The processor 702 executes the program stored in the memory 701 and calls other devices, which can be used to implement the various steps of the motor cooling oil circuit design method provided in the above embodiments of this application.

[0086] Embodiments of this application also provide a vehicle monitoring system, which may include electronic devices as described in any of the above embodiments.

[0087] In practical implementation, the electronic device can be a cloud server. Furthermore, the vehicle monitoring system can also include an in-vehicle terminal and a user terminal. The in-vehicle terminal integrates a GPS positioning module, voltage sensor, vibration sensor, camera (for exterior monitoring), and CAN bus interface (for acquiring target monitoring item information), supporting the activation / sleep of corresponding sensors based on the current status. The cloud server can also store warehouse location information, vehicle status data, monitoring scheme configuration information, and historical monitoring records, possessing data processing and early warning analysis capabilities. The user terminal is a PC / mobile platform for manufacturers / vehicle administrators, supporting status viewing, scheme editing, and early warning reception.

[0088] In practical applications, cloud servers can also be configured to provide a visual interface through user terminals, allowing administrators to add / delete monitoring items for each status, adjust the collection frequency, set early warning thresholds, and support the saving and reuse of solution templates.

[0089] Embodiments of this application also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a computer, causes the computer to perform the design method for the motor cooling oil circuit in any of the above embodiments.

[0090] Embodiments of this application also provide a computer program product containing instructions that, when executed by a computer, cause the computer to perform the design method for the motor cooling oil circuit described in any of the above embodiments.

[0091] It is understood that the specific examples in this document are only intended to help those skilled in the art better understand the embodiments described herein, and are not intended to limit the scope of the invention.

[0092] It is understood that in the various embodiments described in this specification, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments described in this specification.

[0093] It is understood that the various implementation methods described in this specification can be implemented individually or in combination, and the implementation methods in this specification are not limited in this respect.

[0094] Unless otherwise stated, all technical and scientific terms used in the embodiments of this specification have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this specification. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in the embodiments of this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0095] It is understood that the processor in the embodiments of this specification can be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method embodiments can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this specification. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this specification can be directly implemented by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above methods.

[0096] It is understood that the memory in the embodiments of this specification may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory may be random access memory (RAM). It should be noted that the memory in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0097] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this specification.

[0098] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the aforementioned method implementations, and will not be repeated here.

[0099] In the several embodiments provided in this specification, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0100] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0101] In addition, the functional units in the various embodiments of this specification can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0102] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of this specification, in essence, or the parts that contribute to the prior art, or parts of the technical solutions, can be embodied in the form of software products. These computer software products are stored in a storage medium and include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this specification. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0103] The above description is merely a specific embodiment of this specification, but the scope of protection of this invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this specification should be included within the scope of protection of this specification. Therefore, the scope of protection of this invention should be determined by the scope of the claims.

Claims

1. A design method for a motor cooling oil circuit, characterized in that, include: The first unloaded air gap magnetic flux density of the target rotor axially uniform motor and the second unloaded air gap magnetic flux density of the target rotor axially misaligned motor are obtained, and a target value is obtained based on the first unloaded air gap magnetic flux density and the second unloaded air gap magnetic flux density; the target rotor axially misaligned motor is obtained by implementing a rotor skewed pole method on the target rotor axially uniform motor; the target value includes the air gap magnetic flux density difference or the air gap magnetic flux density ratio. Based on the target value, determine the circumferential position of the cooling oil passage; The target radial dimension of the cooling oil circuit is determined from the preset range of radial dimensions of the oil passage; when the target rotor axial misalignment motor is provided with the cooling oil circuit, the electromagnetic performance of the target rotor axial misalignment motor meets the electromagnetic performance requirements, and the thermal performance of the target rotor axial misalignment motor meets the thermal performance requirements.

2. The method according to claim 1, characterized in that, Determining the target radial dimension of the cooling oil passage from a preset range of radial dimensions includes: Based on the first preset search strategy, the current radial dimension of the cooling oil passage is determined from the preset radial dimension range of the oil passage. Based on the circumferential position and the current radial dimension, it is determined whether the current electromagnetic performance of the cooling oil passage meets the electromagnetic performance requirements and whether the current thermal performance of the cooling oil passage meets the thermal performance requirements. If the current electromagnetic performance of the cooling oil circuit does not meet the electromagnetic performance requirements, or the current thermal performance of the cooling oil circuit does not meet the thermal performance requirements, then return to the step of determining the current radial dimension of the cooling oil circuit from the preset oil passage radial dimension range based on the first preset search strategy; if the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements, and the current thermal performance of the cooling oil circuit meets the thermal performance requirements, then determine the current radial dimension as the target radial dimension.

3. The method according to claim 2, characterized in that, The determination of whether the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements and whether the current thermal performance of the cooling oil circuit meets the thermal performance requirements based on the circumferential position and the current radial dimension includes: Based on the circumferential position and the current radial dimension, determine whether the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements; If the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements, then it is determined whether the current thermal performance of the cooling oil circuit meets the thermal performance requirements.

4. The method according to claim 3, characterized in that, Determining whether the current electromagnetic performance of the cooling oil circuit meets the electromagnetic performance requirements based on the circumferential position and the current radial dimension includes: Based on the circumferential position and the current radial dimension, the ratio of the magnetic permeability difference to the oil passage magnetic barrier function is calculated to obtain the waveform of the magnetic permeability difference function after the magnetic barrier is opened in the target rotor axial misalignment motor; The rotor topology of the target rotor axial misalignment motor is determined based on the waveform of the magnetic permeability difference function, and the electromagnetic performance simulation parameters of the rotor topology are obtained. Check whether the electromagnetic performance simulation parameters are within the range of standard electromagnetic performance parameters; If the electromagnetic performance simulation parameters are within the range of the standard electromagnetic performance parameters, then the current electromagnetic performance of the cooling oil circuit is determined to meet the electromagnetic performance requirements; if the electromagnetic performance simulation parameters are not within the range of the standard electromagnetic performance parameters, then the current electromagnetic performance of the cooling oil circuit is determined to not meet the electromagnetic performance requirements.

5. The method according to claim 4, characterized in that, Determining whether the current thermal performance of the cooling oil circuit meets the thermal performance requirements includes: Obtain the thermal performance simulation parameters of the rotor topology; Check whether the simulated thermal performance parameters are within the range of standard thermal performance parameters; If the thermal performance simulation parameters are within the range of the standard thermal performance parameters, then the current thermal performance of the cooling oil circuit is determined to meet the thermal performance requirements; if the thermal performance simulation parameters are not within the range of the standard thermal performance parameters, then the current thermal performance of the cooling oil circuit is determined to not meet the thermal performance requirements.

6. The method according to claim 1, characterized in that, The process of obtaining the first no-load air gap magnetic flux density of the target rotor axially uniform motor and the second no-load air gap magnetic flux density of the target rotor axially misaligned motor includes: Obtain the first no-load air gap magnetic flux density of the target rotor axially uniform motor; Based on the second preset search strategy, the current skew angle is determined from the preset skew angle range. Based on the target rotor axial uniform motor and the current skew angle, the first rotor axial misaligned motor is obtained, and it is detected whether the motor noise value of the first rotor axial misaligned motor is less than a preset noise value. If the motor noise value of the first rotor axial misaligned motor is greater than or equal to the preset noise value, the step of determining the current skew angle from the preset skew angle range is returned. If the motor noise value of the first rotor axial misaligned motor is less than the preset noise value, the first rotor axial misaligned motor is determined to be the target rotor axial misaligned motor, and the second no-load air gap magnetic flux density of the target rotor axial misaligned motor is obtained.

7. The method according to claim 1, characterized in that, The process of obtaining the first no-load air gap magnetic flux density of the target rotor axially uniform motor and the second no-load air gap magnetic flux density of the target rotor axially misaligned motor includes: Obtain the first no-load air gap magnetic flux density of the target rotor axially uniform motor; All test skew angles are determined from the preset skew angle range; based on the target rotor axial uniform motor and each of the test skew angles, the corresponding second rotor axial misalignment motors are determined; the motor noise value of the second rotor axial misalignment motor is less than the preset noise value; Among the various second rotor axial misalignment motors, the second rotor axial misalignment motor with the lowest motor noise value is determined as the target rotor axial misalignment motor, and the second no-load air gap magnetic flux density of the target rotor axial misalignment motor is obtained.

8. The method according to claim 1, characterized in that, The step of obtaining the target value based on the first empty air gap magnetic flux density and the second empty air gap magnetic flux density includes: The difference between the first unloaded air gap magnetic flux density and the second unloaded air gap magnetic flux density is calculated to obtain the air gap magnetic flux density difference value; Alternatively, the ratio of the first unloaded air gap magnetic flux density to the second unloaded air gap magnetic flux density can be calculated to obtain the air gap magnetic flux density ratio.

9. An electronic device, characterized in that, include: A processor, and a memory connected to the processor; The memory is used to store computer programs; The processor is used to call and execute the computer program in the memory to perform the design method of the motor cooling oil circuit as described in any one of claims 1-8.

10. A storage medium, characterized in that, include: The storage medium stores a computer program, which, when executed by a processor, implements the various steps of the design method for the motor cooling oil circuit as described in any one of claims 1-8.

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