Synchronous reluctance motor rotor lamination design method and device, rotor lamination and motor

Abstract

The application provides a synchronous reluctance motor rotor lamination design method and device, a rotor lamination and a motor, and relates to the technical field of motors. The method comprises the following steps: determining a first size parameter of a rotor lamination, a second size parameter of an outer magnetic bridge and a third size parameter of a plurality of layers of magnetic barriers in a synchronous reluctance motor, and the plurality of layers of magnetic barriers have magnetic bridge passages; determining a first magnetic barrier closest to the center of the rotor lamination in the plurality of layers of magnetic barriers, and adjusting the position of the first magnetic barrier to determine an adjustment distance and a rotation angle of the first magnetic barrier, and the adjusted first magnetic barrier does not intersect with other magnetic barriers in the plurality of layers of magnetic barriers; and performing parameter adjustment on at least one of the first size parameter, the second size parameter, the third size parameter, the adjustment distance and the rotation angle to obtain target structure parameters for determining the structure of the rotor lamination. The above rotor lamination design method improves the operation stability of the synchronous reluctance motor and improves the rotor lamination design efficiency.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a design method, device, rotor lamination and motor for a synchronous reluctance motor rotor lamination. Background Technology

[0002] With the popularization of smart homes, cleaning appliances such as robot vacuums and vacuum cleaners are developing towards lighter weight and higher speeds. Currently, these products generally use permanent magnet motors as their power source. Although the performance is stable, the cost of permanent magnet materials is high, accounting for a large proportion of the total cost of the motor, and there is a risk of demagnetization at high temperatures, which limits the improvement of the product's cost-effectiveness.

[0003] In contrast, the rotor of a synchronous reluctance motor is made of a single stacked iron core, eliminating the need for expensive permanent magnets. This not only significantly reduces material costs but also eliminates the risk of demagnetization, resulting in substantial economic benefits. However, currently, synchronous reluctance motors are mainly used in high-power household appliances such as washing machines, and have not yet been applied in the field of small and micro motors.

[0004] This is mainly because the rotor magnetic barrier structure of traditional synchronous reluctance motors is complex, resulting in large torque fluctuations during motor operation, which cannot meet the requirements of cleanroom motors. Furthermore, the structural parameters of the rotor laminations need to be precisely matched, and the rotor lamination design also requires extensive simulation optimization to meet performance requirements, resulting in long design cycles and high costs. Summary of the Invention

[0005] This application provides a design method, device, rotor laminations, and motor for a permanent magnet synchronous reluctance motor. By establishing a dimensional parameter system for the rotor laminations, external magnetic bridge, and multi-layer magnetic barriers, and by coordinating and optimizing related dimensional parameters, the structural relationships of each part of the rotor laminations and the layout of the multi-layer magnetic barriers can be reasonably designed under the constraints of the small and micro-sized dimensions of the synchronous reluctance motor, thereby improving the running stability of the synchronous reluctance motor and the design efficiency of the rotor laminations.

[0006] In a first aspect, this application provides a method for designing rotor laminations for a synchronous reluctance motor, the method comprising:

[0007] The first dimensional parameters of the rotor laminations, the second dimensional parameters of the external magnetic bridge, and the third dimensional parameters of the multi-layer magnetic barriers in the synchronous reluctance motor are determined, and there are magnetic bridge paths between the multi-layer magnetic barriers.

[0008] The first magnetic barrier, which is closest to the center of the rotor lamination in the multi-layer magnetic barrier, is identified, and its position is adjusted to determine the adjustment distance and rotation angle of the first magnetic barrier. The adjusted first magnetic barrier does not intersect with other magnetic barriers in the multi-layer magnetic barrier.

[0009] The target structural parameters for determining the rotor lamination structure are obtained by adjusting at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, and the rotation angle.

[0010] In this way, compared with the problem of complex rotor structure design and large amount of calculation in traditional synchronous reluctance motors, this application first establishes an initial parameter system for rotor laminations, external magnetic bridges and multi-layer magnetic barriers, then performs geometrically constrained position and angle corrections around the first magnetic barrier near the center, and then adjusts the relevant dimensional parameters to form target structural parameters that can be directly used to determine the rotor lamination structure.

[0011] The above-described processing steps link the correction of the first magnetic barrier with the overall contour adjustment, enabling the miniature synchronous reluctance motor to achieve a coordinated arrangement of multiple magnetic barriers and magnetic bridge paths within a limited space. This also ensures a clear adjustment sequence and output result for the rotor design process. Therefore, the design method provided in this application can significantly reduce the number of parameters required during the design process, making the design of rotor laminations simpler and easier, thereby greatly shortening the motor design cycle, accelerating product development, and facilitating rapid response to market demands.

[0012] Furthermore, addressing the limitation of synchronous reluctance motors in the application of small and micro-sized cleaning appliances, this application simplifies the design method of the lamination structure, enabling more convenient optimization of the rotor lamination structure and effectively improving the motor's torque ripple. This not only enhances the motor's operational smoothness and quietness but also improves its overall performance and quality, enabling it to meet the drive motor requirements of high-speed cleaning products such as robotic vacuum cleaners and robot vacuums.

[0013] Optionally, the process for determining the third dimension parameter of the multi-layered magnetic barrier includes:

[0014] Based on the characteristics of the synchronous reluctance motor, the target number of multi-layer magnetic barriers is determined to be n+1, where n is an integer greater than or equal to 1.

[0015] Based on the direction away from the center of the rotor lamination, it is determined that the radial sides of the second magnetic barrier in the first n layers are concentric arcs, and the radial sides of the first magnetic barrier are non-concentric arcs.

[0016] Determine the concentric circle parameters corresponding to each second magnetic barrier, and the non-concentric circle parameters corresponding to the first magnetic barrier;

[0017] The third dimension parameter of the multi-layer magnetic barrier is determined based on concentric circle parameters and non-concentric circle parameters.

[0018] Based on the above analysis, this application determines the number and structure of magnetic barriers by measuring motor performance, and then constrains the boundary morphology of the second and first magnetic barriers respectively, so that the geometric relationship of the multi-layer magnetic barriers can be expressed parametrically, and the layered structure is uniformly mapped to a third dimension parameter, thereby providing a directly callable dimension basis for the overall design of rotor laminations.

[0019] Therefore, after determining the third dimension parameter using the above method, the number of layers, arc shape, and parameter relationship of the multi-layer magnetic barrier can be represented by a unified set of dimension parameters. This enables the optimized design of magnetic circuit performance and structural adaptability within a limited space, which helps to coordinate with the design of other structures such as the external magnetic bridge and rotor laminations, and provides a clear source of parameters and boundary constraints for subsequent structural adjustments.

[0020] Optionally, based on concentric and non-concentric circle parameters, a third dimension parameter for the multi-layered magnetic barrier is determined, including:

[0021] Based on concentric circle parameters, construct n layers of the second magnetic barrier, and based on non-concentric circle parameters, construct the first magnetic barrier;

[0022] Based on the dimensional parameters required to construct the n-layer second and first magnetic barriers, the third dimensional parameters of the multi-layer magnetic barriers are determined.

[0023] It should be noted that the third dimensional parameter can be further used for subsequent rotor lamination contour constraints and magnetic barrier spacing verification to ensure that each layer of magnetic barriers meets the preset layout relationship within the limited rotor lamination space. Through the above parameter design, concentric and non-concentric circular structures can be collaboratively determined under the same design framework, thereby forming a multi-layer magnetic barrier parameter set suitable for small and micro synchronous reluctance motors.

[0024] In this way, the local configuration of the layered magnetic barrier is converted into a unified third dimension parameter, which facilitates subsequent structural adjustments and batch design, and ensures that the geometric relationship of the multi-layered magnetic barrier remains consistent and traceable.

[0025] Optionally, based on concentric circle parameters, an n-layer second magnetic barrier is constructed, including:

[0026] On the outside of the rotor lamination, there are pre-set concentric circle parameters corresponding to n layers of the second magnetic barrier. The concentric circle parameters include the first center, the first radius, and the first width.

[0027] Based on the first center and the first radius, construct the first arc; based on the first center, the first radius, and the sum of the first width, construct the second arc.

[0028] The second magnetic barrier is determined based on the first and second circular arcs, and the first centers of the first n layers of the second magnetic barrier do not coincide; the distance between the first and second circular arcs is equal to the first width.

[0029] Therefore, by using the first center and first radius of different levels to control the positional relationship of each second magnetic barrier, and then using the first width to uniformly limit the radial thickness of each layer of magnetic barriers, multiple layers of second magnetic barriers can be stably arranged on the outside of the rotor lamination according to a preset geometric relationship, and cooperate with the subsequent magnetic bridge structure to form a continuous magnetic circuit.

[0030] In this way, after constructing the second magnetic barrier using the above construction method, the geometric boundary of the second magnetic barrier can be uniformly parameterized and defined. The width and positional relationship of each layer of magnetic barriers remain consistent, which facilitates the structural design and reuse calculation of rotor laminations. At the same time, it reduces the layout deviation caused by the irregularity of the magnetic barrier boundary and makes the size control of the multi-layer magnetic barriers clearer.

[0031] Optionally, based on non-concentric circle parameters, a first magnetic barrier is constructed, including:

[0032] On the outside of the rotor lamination, the non-concentric circle parameters corresponding to the first magnetic barrier are preset. The non-concentric circle parameters include the second center, the second radius, the second width, and the length parameters.

[0033] Based on the second center and the second radius, construct the third arc; based on the third arc, the second width and length parameters, construct the bottom structure of the first magnetic barrier.

[0034] Determine the positions of the endpoints at both ends of the bottom structure, as well as the angle between the endpoint positions and the partition line; the partition line is the dividing line that divides the rotor laminations into multiple regions, and each region is used to accommodate n+1 layers of magnetic barriers;

[0035] Based on the endpoint positions and included angles, construct the side structure of the first magnetic barrier;

[0036] The first magnetic barrier is determined based on the third circular arc, the bottom structure, and the side structure.

[0037] In this way, by setting the first magnetic barrier as a non-concentric circular profile and using the angle between the endpoint position and the partition line to constrain the direction of the side structure, the first magnetic barrier can be adapted to the regional arrangement relationship of the multi-layer magnetic barriers. Since there is a clear parametric relationship between the bottom structure, the side structure, and the third arc, the geometry of the first magnetic barrier can be stably determined, thus providing a consistent modeling basis for the magnetic barrier arrangement of the rotor laminations and facilitating subsequent dimensional matching, thereby shortening the design cycle.

[0038] Optionally, at least one of the first dimensional parameter, the second dimensional parameter, the third dimensional parameter, the adjustment distance, and the rotation angle is adjusted to obtain the target structural parameters for determining the rotor lamination structure, including:

[0039] Determine the width parameter of the target magnetic bridge corresponding to the middle part of the multi-layer magnetic barrier, and the length of the target magnetic bridge covers at least a part of the multi-layer magnetic barrier;

[0040] The target structural parameters for determining the rotor lamination structure are obtained by adjusting at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter.

[0041] Based on the above structural design of the target magnetic bridge, a constrained continuous magnetic circuit is formed between the target magnetic bridge and the multi-layer magnetic barriers. As a result, the rotor lamination structure after parameter adjustment can express the matching relationship between the magnetic bridge coverage and the magnetic barrier size in a more explicit way, so that the target structural parameters have determinism that can be directly used for drawing and simulation.

[0042] Therefore, after adopting the above implementation method, the magnetic bridge width, coverage length and related shape parameters of the rotor lamination can be determined in a coordinated manner, reducing the uncertainty caused by repeated trial calculations of multiple parameters, and making the structure of the rotor lamination more suitable for the compact arrangement and stable design of micro synchronous reluctance motors.

[0043] Optionally, the length of the target magnetic bridge covers all magnetic barriers in the multi-layer magnetic barrier except for the third magnetic barrier, which is the magnetic barrier in the multi-layer magnetic barrier that is farthest from the center of the rotor lamination.

[0044] In this way, after adopting the above structural design, the target magnetic bridge can provide continuous support and magnetic flux connection for the multi-layer magnetic barriers except for the third magnetic barrier, while the third magnetic barrier remains in an independent arrangement with the furthest distance from the center. This makes the hierarchical relationship of the magnetic barriers clear, the geometric boundary of the rotor lamination easier to control, and provides a stable data basis for subsequent magnetic circuit distribution and structural parameter adjustment.

[0045] Optionally, the first magnetic barrier includes a first left magnetic barrier and a first right magnetic barrier, which are distributed on both sides of the target magnetic bridge; adjusting the position of the first magnetic barrier to determine the adjustment distance and rotation angle of the first magnetic barrier includes:

[0046] Determine the positions of the first left magnetic barrier and the first right magnetic barrier;

[0047] Adjust the position of either the first left magnetic barrier or the first right magnetic barrier to move it, and determine the adjustment distance of the first magnetic barrier;

[0048] Rotate the moved magnetic barrier to determine the rotation angle of the first magnetic barrier.

[0049] In this way, by splitting the first magnetic barrier into a first left magnetic barrier and a first right magnetic barrier, and adjusting the displacement and rotation of either magnetic barrier around the target magnetic bridge, the spatial position and angular relationship of the first magnetic barrier can be quantitatively characterized and used as the basis for subsequent rotor lamination parameter correction. Therefore, the relative arrangement between the first magnetic barrier and the target magnetic bridge can be precisely controlled, resulting in a more consistent magnetic circuit distribution of the rotor laminations, reducing local magnetic circuit distortion, and giving the structural adjustment process repeatable parametric characteristics.

[0050] Optionally, at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter is adjusted to obtain the target structural parameters for determining the rotor lamination structure, including:

[0051] Parametric simulation analysis was performed on the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter to obtain the torque fluctuation results corresponding to the synchronous reluctance motor.

[0052] If the torque fluctuation result does not meet the preset conditions, adjust at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the distance, the rotation angle, and the width parameter, and re-perform the parametric simulation analysis until the torque fluctuation result obtained from the re-parametric simulation analysis meets the preset conditions.

[0053] The parameters corresponding to the torque fluctuation results meeting the preset conditions are used as the target structural parameters.

[0054] In this way, by establishing a correspondence between geometric dimensions, magnetic barrier positions, and magnetic bridge width and torque fluctuations through parametric simulation, and using the target structural parameters that meet the preset conditions as output, the rotor lamination structure can be quantitatively screened and converged during the design stage, thereby obtaining the target structural parameters suitable for small and micro synchronous reluctance motors.

[0055] Therefore, after determining the target structural parameters using simulation, the simulation optimization results can directly correspond to the structural parameters required for manufacturing. This allows the design process to optimize parameters around specific indicators, ensuring that the generated target structural parameters can accurately achieve the expected performance, reducing the number of repeated trials and errors, and making the obtained rotor lamination structure closer to the predetermined low fluctuation requirements.

[0056] Optionally, at least one of the following parameters may be adjusted: the first dimension parameter, the second dimension parameter, the third dimension parameter, the distance, the rotation angle, and the width parameter, including:

[0057] The first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter are prioritized to obtain multiple parameter sets with different priority levels. Each parameter set has a different degree of influence on the torque fluctuation of the synchronous reluctance motor.

[0058] Based on the torque fluctuation results, the values ​​of at least some parameters in each parameter set are adjusted step by step according to priority level.

[0059] By prioritizing parameters, we can prioritize adjusting the parameters that have the greatest impact on performance, enabling us to quickly improve performance metrics in the first few iterations and avoid wasting time tuning parameters with lower priority, thus significantly accelerating the convergence speed of the entire optimization process.

[0060] Therefore, by adjusting the parameters using the aforementioned priority method, a correspondence can be established between the parameter adjustment order and the torque fluctuation response. This gives the correction of each parameter a clear order and constraint boundary, thus forming the target structural parameters for hierarchical optimization. Furthermore, this makes the torque fluctuation adjustment process more targeted, reduces the number of ineffective adjustments, and makes it easier for the rotor lamination structure of the synchronous reluctance motor to converge to the design result that satisfies operational stability.

[0061] Optionally, the method also includes:

[0062] After determining the target structural parameters of the rotor lamination structure, the fillet parameters of the rotor lamination are adjusted to make the corners rounded, thus obtaining the target structural parameters that include the rounded corner features.

[0063] In this way, by performing corner rounding after the target structural parameters are determined, the geometric abrupt changes at the corners of the rotor laminations are weakened, and the local stress concentrations and magnetic flux abrupt changes at the corners are smoothed out. Therefore, the target structural parameters simultaneously include magnetic circuit design parameters and corner rounding geometric parameters. The resulting rotor lamination structure is easier to match with the aforementioned magnetic barrier layout and magnetic bridge dimensions, and ensures that subsequent manufacturing parameters remain consistent with simulation parameters, thereby making the rotor lamination design results more stable.

[0064] Secondly, this application provides a synchronous reluctance motor rotor lamination, the rotor lamination having multiple regions, each region having n+1 layers of magnetic barriers;

[0065] In the second magnetic barrier corresponding to the first n layers, the radial outer side of each second magnetic barrier is a concentric circular arc, the radial outer side of the first magnetic barrier corresponding to the n+1th layer is a circular arc, and the radial inner side and the two circumferential sides of the first magnetic barrier are straight lines.

[0066] The structure of the rotor laminations is determined using the method described above.

[0067] Based on the above analysis, the rotor lamination of the synchronous reluctance motor provided in this application consists of multiple regions. Within each region, the first n layers of second magnetic barriers form relatively regular outer boundaries with concentric circular arcs, allowing magnetic flux to be distributed along a relatively smooth path near the outer circular region. The first magnetic barrier located in the (n+1)th layer adopts a combined profile of outer circular arcs, inner straight lines, and straight lines on both circumferential sides. During the design phase, its position is adjusted based on the location of the first magnetic barrier closest to the center of the rotor lamination to determine the adjustment distance and rotation angle, ensuring a relative positional relationship between this final-stage magnetic barrier and the aforementioned second magnetic barriers that meets the requirements of magnetic circuit distribution.

[0068] Because the boundary forms and relative positions of each magnetic barrier layer are parameterized, the magnetic flux in each region of the rotor is distributed along the low-resistivity channel formed by the retained iron core under the action of the stator's rotating magnetic field, and a controllable magnetic reluctance difference is generated between different magnetic barrier layers, thereby making the torque output path more stable. Based on the above rotor lamination structure, the first magnetic barrier near the center of the rotor lamination is no longer arranged solely based on experience, but its position is adjusted to limit local magnetic circuit changes within a controllable range, making the magnetic flux distribution more balanced. This, in turn, suppresses torque fluctuations, radial magnetic pull fluctuations, and the resulting operational instability during high-speed rotor operation.

[0069] Furthermore, since the rotor lamination adopts a layered form of n+1 magnetic barriers, and the outer second magnetic barrier adopts a concentric circular arc and the last stage first magnetic barrier adopts a combination of arc edge and straight edge contour, the structure takes into account both the compactness of the arrangement and the magnetic circuit modulation capability under small and micro size. At the same time, it is easy to process by stamping or laser forming, so it can form a more suitable rotor structure in small high-speed motors for cleaning appliances.

[0070] Optionally, the first magnetic barrier includes an asymmetric magnetic barrier, which is a structure formed by translating and rotating the reference magnetic barrier.

[0071] Based on the above structural design, compared with the local magnetic flux congestion and magnetic circuit repetitive saturation phenomenon that are easily formed in the existing magnetic barrier under symmetrical structure, the design of the asymmetric magnetic barrier in this application makes its local geometric center offset. Therefore, during the rotor rotation, the spatial harmonic components of the magnetic circuit can be weakened, the torque output waveform becomes smoother, and the torque pulsation and the resulting vibration and noise are also reduced.

[0072] At the same time, the asymmetric magnetic barrier, in conjunction with the outer magnetic bridge and the preceding magnetic barrier layer, can further optimize the local magnetic flux closure path while maintaining the overall strength and manufacturability of the rotor laminations. This allows the miniature synchronous reluctance motor to still obtain a relatively stable reluctance torque output in a confined space, which is beneficial for cleaning appliances to achieve lower noise, lower vibration and better energy efficiency under high-speed operation conditions.

[0073] Thirdly, this application provides a synchronous reluctance motor rotor lamination design device, the device comprising:

[0074] The first determining module is used to determine the first dimension parameters of the rotor laminations, the second dimension parameters of the external magnetic bridge, and the third dimension parameters of the multi-layer magnetic barriers in the synchronous reluctance motor, wherein there are magnetic bridge paths between the multi-layer magnetic barriers.

[0075] The second determining module is used to determine the first magnetic barrier that is closest to the center of the rotor lamination in the multi-layer magnetic barrier, and adjust the position of the first magnetic barrier to determine the adjustment distance and rotation angle of the first magnetic barrier. The adjusted first magnetic barrier does not intersect with other magnetic barriers in the multi-layer magnetic barrier.

[0076] The adjustment module is used to adjust at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, and the rotation angle to obtain the target structural parameters for determining the rotor lamination structure.

[0077] Fourthly, this application provides a synchronous reluctance motor, the synchronous reluctance motor comprising:

[0078] The rotor laminations are designed using the methods described above.

[0079] It should be noted that the third and fourth aspects of this application are the technical solutions corresponding to the first and second aspects of this application, and the similar beneficial effects achieved by each aspect and the corresponding feasible implementation method will not be repeated here.

[0080] The permanent magnet synchronous reluctance motor rotor lamination design method, apparatus, rotor lamination, and motor provided in this application determine the first dimensional parameters of the rotor lamination, the second dimensional parameters of the external magnetic bridge, and the third dimensional parameters of the multi-layer magnetic barriers. Within the multi-layer magnetic barriers, the first magnetic barrier closest to the center of the rotor lamination is identified. The position of the first magnetic barrier is adjusted to determine the adjustment distance and rotation angle. Then, at least one of the relevant parameters is adjusted to obtain the target structural parameters for determining the rotor lamination structure. This allows for the design of the structural relationships of each part of the rotor lamination and the layout of the multi-layer magnetic barriers under small-scale constraints, simplifying the rotor lamination structure design process and shortening the design cycle to quickly meet the rotor lamination structure design requirements of small-scale synchronous reluctance motors. Therefore, by collaboratively designing and optimizing the rotor lamination structure, the adaptability of the rotor lamination structure, the rationality of the magnetic circuit distribution, and the design efficiency can be considered under limited size conditions, thereby improving the magnetic circuit distribution, reducing torque ripple, and improving the operational stability of the synchronous reluctance motor. Attached Figure Description

[0081] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0082] Figure 1 This is a schematic diagram of the structure of a synchronous reluctance motor rotor lamination provided in an embodiment of this application;

[0083] Figure 2 This is a schematic diagram of an application scenario provided by an embodiment of this application;

[0084] Figure 3 A statistical diagram illustrating the torque fluctuation comparison of a synchronous reluctance motor provided in an embodiment of this application;

[0085] Figure 4 A flowchart illustrating a synchronous reluctance motor rotor lamination design method provided in this application embodiment;

[0086] Figure 5 A schematic diagram illustrating a scenario for determining a first size parameter and a second size parameter, provided for an embodiment of this application;

[0087] Figure 6 A design drawing for constructing a magnetic barrier is provided in an embodiment of this application;

[0088] Figure 7 A design drawing of an intermediate magnetic bridge provided in an embodiment of this application;

[0089] Figure 8 A design drawing of an asymmetric magnetic bridge provided in an embodiment of this application;

[0090] Figure 9 A design drawing of a rotor lamination provided in an embodiment of this application;

[0091] Figure 10 A scene diagram of the dq axis provided in an embodiment of this application;

[0092] Figure 11 A flowchart illustrating a method for designing and optimizing rotor laminations of a synchronous reluctance motor, provided in an embodiment of this application;

[0093] Figure 12 A schematic diagram of a synchronous reluctance motor rotor lamination design device provided in this application embodiment;

[0094] Figure 13 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0095] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0096] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application.

[0097] To facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with essentially the same function and effect. For example, the first size parameter and the second size parameter are only used to distinguish different size parameters and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0098] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0099] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0100] Currently, high-speed cleaning products (such as robotic vacuum cleaners and vacuum cleaners) generally use permanent magnet motors as drive devices. However, permanent magnet motors are highly dependent on rare earth permanent magnet materials (such as neodymium iron boron), which leads to high overall manufacturing costs. Furthermore, in actual operating conditions, there is a risk that the permanent magnets may demagnetize due to high temperatures or complex alternating magnetic fields, affecting the long-term reliability of the equipment.

[0101] Furthermore, the scarcity of rare-earth permanent magnet materials further increases the production costs of related end products. Therefore, the development of novel motor technologies without rare-earth permanent magnets has significant engineering application value and economic benefits in the field of clean appliances.

[0102] Synchronous reluctance motors (SynRMs) are ideal alternatives to permanent magnet motors because their rotors use a pure iron core structure and do not require any permanent magnets. This not only significantly reduces material costs but also fundamentally eliminates the risk of demagnetization failure.

[0103] However, currently, synchronous reluctance motors are mainly used in high-power applications such as washing machines and industrial motors in the home appliance industry. Their application in small and micro motors faces problems such as high design complexity, complex rotor lamination design, large torque pulsation, and poor structural adaptability, which has prevented them from being used in cleaning appliances.

[0104] Therefore, most small high-speed drive motors in existing cleaning appliances use permanent magnet synchronous motors, or, in some cost-reduction applications, synchronous reluctance motors are used as a substitute. The rotor of a synchronous reluctance motor typically constructs magnetic circuit differences by setting multiple layers of magnetic barriers and magnetic bridge paths between them on the rotor laminations, thereby outputting torque under the action of the stator's rotating magnetic field. Its performance largely depends on the matching relationship between the rotor lamination size, magnetic barrier size, and magnetic bridge layout.

[0105] However, existing design methods for synchronous reluctance motors are mainly geared towards higher power motors. Under the constraint of small and micro-sized dimensions, the available space for rotor laminations is limited, and it is difficult to simultaneously meet the requirements of magnetic circuit distribution and structural compactness between multiple magnetic barriers and magnetic bridge paths. At the same time, the existing design process often relies on experience to select rotor shape parameters, magnetic bridge parameters, and magnetic barrier parameters, and then gradually corrects them through repeated simulations. The parameters are strongly coupled and the adjustment path is unclear, resulting in long design cycles and high costs.

[0106] To address the aforementioned issues, this application proposes a design method for rotor laminations of a synchronous reluctance motor. This method involves determining the first dimensional parameters of the rotor lamination, the second dimensional parameters of the external magnetic bridge, and the third dimensional parameters of the multi-layered magnetic barriers. Within the multi-layered magnetic barriers, the method identifies the first magnetic barrier closest to the center of the rotor lamination. The position of this first magnetic barrier is adjusted to determine the adjustment distance and rotation angle. Further parameter adjustments are made to at least one of the relevant parameters to obtain the target structural parameters for determining the rotor lamination structure. This method enables the design of the structural relationships of each part of the rotor lamination and the layout of the multi-layered magnetic barriers under small-scale constraints, simplifying the rotor lamination structure design process and shortening the design cycle to quickly meet the rotor lamination structure design requirements of small-scale synchronous reluctance motors. Therefore, by collaboratively designing and optimizing the rotor lamination structure, it is possible to balance the adaptability of the rotor lamination structure, the rationality of the magnetic circuit distribution, and the design efficiency under limited size conditions. This improves the magnetic circuit distribution, reduces torque ripple, and enhances the operational stability of the synchronous reluctance motor.

[0107] Optionally, this application provides a method for designing rotor laminations for synchronous reluctance motors, applied to rotor laminations of synchronous reluctance motors. For example, Figure 1 This is a schematic diagram of the structure of a synchronous reluctance motor rotor lamination provided in an embodiment of this application, as shown below. Figure 1 As shown, the rotor lamination 100 includes multiple regions, and each region has n+1 layers of magnetic barriers.

[0108] In the second magnetic barrier corresponding to the first n layers, the radial outer side of each second magnetic barrier is a concentric circular arc, the radial outer side of the first magnetic barrier corresponding to the n+1th layer is a circular arc, and the radial inner side and circumferential sides of the first magnetic barrier are straight lines.

[0109] In this embodiment of the application, the rotor lamination 100 of the synchronous reluctance motor is a ferromagnetic stamped lamination for the rotor of the synchronous reluctance motor. It is used to form the magnetic circuit skeleton of the rotor and define multiple magnetic barrier regions so as to cooperate with the rotating magnetic field of the stator to output reluctance torque and suppress torque pulsation.

[0110] The rotor lamination 100 is usually located in the radial main body position in the rotor core, and forms a complete rotor structure with the rotating shaft, lamination fastening structure and adjacent laminations.

[0111] In one possible embodiment, the rotor lamination 100 may be a disc-shaped, near-disc-shaped, or an annular sheet with partial notches. The material may be electrical pure iron, silicon steel sheet, or low-carbon alloy magnetic steel. It may also be a cold-rolled silicon steel lamination with insulating coating. The manufacturing form may be a stamped sheet, a laser-cut lamination, or an in-mold formed sheet. The embodiments of this application do not specifically limit the shape and material of the rotor lamination 100.

[0112] Optionally, the outer diameter, inner diameter, and thickness of the rotor lamination 100 can be set according to the installation space of the micro motor. The lamination outline is generally consistent with the rotor core shape, and the dimensions of each area and the spacing of the magnetic barrier layer must meet the requirements of lamination assembly, mechanical strength, and insulation gap.

[0113] In this application, multiple regions are magnetic circuit partitions disposed in the circumferential direction of the rotor lamination 100. These partitions divide the rotor lamination 100 into several repeating or nearly repeating magnetic barrier layout units, so as to configure each layer of magnetic barriers separately and realize magnetic flux distribution, such as... Figure 1 The four areas shown.

[0114] Multiple regions are evenly distributed or arranged symmetrically along the circumference of the rotor lamination 100, and are separated from each other by circumferential partitions or retained core parts, so that each region forms an electromagnetically independent yet cohesive working unit.

[0115] In one possible embodiment, the region can be a sector-shaped region, a near-sector-shaped region, or a locally repeating unit region, or it can be an arc-shaped partition, a trapezoidal partition, or a non-equiangular partition distributed around the center of the rotor lamination; the circumferential span, radial extension length, and included angle between regions can be determined according to the number of rotor poles, the air gap magnetic flux density distribution, and the processing technology of the rotor lamination 100, and the region boundaries usually retain sufficient structural continuity to maintain the overall strength of the rotor.

[0116] Each region has n+1 layers of magnetic barriers. The magnetic barriers are non-magnetic or low-permeability channels formed inside the rotor laminations 100. They are used to change the magnetic flux path and establish anisotropic magnetic reluctance differences, thereby cooperating with the stator magnetic field to generate synchronous reluctance torque.

[0117] In terms of structural relationship, the n+1 layers of magnetic barriers are usually arranged sequentially from the side closest to the center of the rotor lamination 100 outwards. The second magnetic barriers corresponding to the first n layers form a relatively regular magnetic reluctance channel, and the first magnetic barrier corresponding to the n+1 layer forms the final magnetic barrier for further optimizing the magnetic circuit. The magnetic barriers are separated by retaining the iron core to ensure mechanical strength.

[0118] In one possible embodiment, n can be an integer of 1, 2, 3, or larger. The number of magnetic barrier layers can be selected based on the target torque, slot-pole fit, and the dimensions of the rotor lamination 100. The magnetic barriers can be formed by stamping, laser grooving, or etching. The interior of the magnetic barriers can be filled with air, an insulating medium, or remain as a cavity. The radial width, arc length, interlayer spacing, and proportional relationship to the rotor outer diameter of each magnetic barrier layer can be set according to a preset magnetic circuit balance relationship, so that the magnetic flux is deflected step by step in the multi-layer path and magnetoresistive modulation is achieved. This application does not specifically limit this aspect.

[0119] It should be noted that the radial outer edges of the second magnetic barriers corresponding to the first n layers are all concentric circular arcs. The second magnetic barrier is used to form a continuous or nearly continuous circular arc boundary on the radial outer edge side so that the outer contours of adjacent magnetic barrier layers maintain a coaxial relationship around the center of the rotor lamination 100 and smooth the magnetic flux entry path.

[0120] In one possible embodiment, the concentric arc of the second magnetic barrier can be a complete arc, a partial arc, or a segmented fitted arc. Alternatively, depending on the local machining accuracy requirements, it can be a curve with equal or approximately equal radii centered at the same rotor lamination. The arc radius of the second magnetic barrier is usually matched with the rotor outer diameter and air gap radius. Its arc length, radial thickness, and spacing with adjacent magnetic barriers can be evenly arranged between layers to maintain the consistency of magnetic flux distribution at the outer edge of each region.

[0121] The outer radial side of the first magnetic barrier corresponding to the (n+1)th layer is an arc, and its inner radial side and circumferential sides are straight lines. The first magnetic barrier is used to form the profile of the final magnetic barrier near the center region of the rotor lamination 100 and to constrain the local magnetic flux.

[0122] The radial outer edge of the first magnetic barrier is set as an arc to connect with the curved boundary of the outer magnetic barrier layer, while the radial inner edge and the two circumferential sides are set as straight lines to form an opening or wedge-shaped profile that is easy to adjust parametrically, so that the first magnetic barrier has a clear directionality in the circumferential direction.

[0123] In one possible embodiment, the outer arc of the first magnetic barrier can be transitioned to the straight edge by rounded corners or broken lines. The radial dimension, circumferential width and corner angle of the first magnetic barrier can be adjusted according to the position of the first magnetic barrier that is closest to the center of the rotor lamination 100, and a spatial constraint of non-intersection or partial avoidance is maintained between it and the second magnetic barrier.

[0124] Based on the above analysis, the rotor lamination 100 of the synchronous reluctance motor provided in this application is composed of multiple regions. Within each region, the first n layers of second magnetic barriers form relatively regular outer boundaries with concentric circular arcs, allowing magnetic flux to be distributed along a relatively smooth path near the outer circular region. The first magnetic barrier located in the (n+1)th layer adopts a combined profile of outer circular arcs, inner straight lines, and straight lines on both circumferential sides. During the design phase, its position is adjusted based on the position of the first magnetic barrier closest to the center of the rotor lamination to determine the adjustment distance and rotation angle, ensuring a relative positional relationship between this final-stage magnetic barrier and the aforementioned second magnetic barriers that meets the requirements of magnetic circuit distribution.

[0125] Because the boundary forms and relative positions of each magnetic barrier layer are parameterized, the magnetic flux in each region of the rotor is distributed along the low reluctance channel formed by the retained iron core under the action of the stator's rotating magnetic field, and a controllable reluctance difference is generated between different magnetic barrier layers, thereby making the torque output path more stable. Based on the structure of the rotor lamination 100, the first magnetic barrier near the center of the rotor lamination 100 is no longer arranged solely based on experience, but its position is adjusted to limit local magnetic circuit changes within a controllable range, making the magnetic flux distribution more balanced. This, in turn, suppresses torque fluctuations, radial magnetic pull fluctuations, and the resulting operational instability during high-speed rotor operation.

[0126] Furthermore, since the rotor lamination 100 adopts a layered form of n+1 layers of magnetic barriers, and the outer second magnetic barrier adopts a concentric circular arc and the last stage first magnetic barrier adopts a combination of arc edge and straight edge contour, the structure takes into account both the compactness of the arrangement and the magnetic circuit modulation capability under small and micro size. At the same time, it is easy to process by stamping or laser forming, so it can form a more suitable rotor structure in small high-speed motors for cleaning appliances.

[0127] Optional, such as Figure 1 As shown, the outer and inner edges of the outer magnetic bridge of the rotor lamination 100 are both concentric arcs, and the radial width of the outer magnetic bridge is equal.

[0128] In this embodiment of the application, the external magnetic bridge may refer to a bridge-shaped structure located on the outer edge of the rotor lamination 100, which connects adjacent magnetic barriers to form a magnetic circuit path.

[0129] In one possible embodiment, the outer and inner edges of the outer magnetic bridge adopt concentric circular arc contours, making the boundary transition along the circumferential direction continuous and the curvature consistent, thereby making the magnetic flux distribution in the bridge body more uniform and reducing local magnetic saturation and magnetic resistance fluctuations caused by boundary angles or curvature abrupt changes.

[0130] In this application, the radial widths of the outer magnetic bridges are equal, which means that the effective bridge widths at all points along the circumference are consistent or approximately consistent. This ensures that the outer magnetic bridges maintain consistent magnetic flux carrying capacity and leakage suppression capacity in each region, avoiding magnetic circuit imbalance caused by changes in bridge width.

[0131] Optionally, the outer magnetic bridge can be made of the same silicon steel material, low-loss electrical steel material, or other high-permeability ferromagnetic alloy material as the rotor lamination 100 body, and the required concentric arc outer and inner boundaries can be obtained by stamping, laser finishing, or integral molding; this application embodiment does not specifically limit this.

[0132] It should be noted that in different implementations, the external magnetic bridge can be in the form of a ring, an arc segment, or a locally widened arc-shaped bridge body to adapt to rotor lamination structures with different diameter grades and different numbers of magnetic barrier layers.

[0133] Based on the above analysis, it can be seen that the concentric arc-shaped outer edge and inner edge with equal radial width can enable the outer magnetic bridge to maintain a relatively stable magnetic circuit bearing state when the rotor rotates at high speed. This is beneficial to reduce air gap magnetic flux density fluctuation and torque pulsation, thereby improving the smoothness and adaptability of synchronous reluctance motor operation.

[0134] It should be noted that during operation, the rotor laminations 100 rotate synchronously with the shaft. After the stator windings are energized, a rotating magnetic field is formed in the air gap. When the magnetic flux passes through the outer circumference of the rotor, the outer magnetic bridge provides a continuous low magnetic reluctance path, and the flux enters the adjacent magnetic barrier region along a smooth path under the guidance of the concentric arc boundary of the outer magnetic bridge. Since the outer and inner edges of the outer magnetic bridge are both concentric arcs, the distribution of magnetic flux on both sides of the bridge body is more uniform. The equal radial width of the outer magnetic bridge ensures that the magnetic flux carrying conditions at each circumferential position are consistent. Therefore, it can also effectively reduce local magnetic saturation, magnetic flux concentration, and magnetic circuit distortion caused by geometric abrupt changes.

[0135] As the rotor continues to rotate under the influence of the stator's rotating magnetic field, the magnetic reluctance difference formed by the outer magnetic bridge and multiple magnetic barriers stabilizes the output torque, thereby reducing torque pulsation and radial force fluctuations caused by discontinuities in the outer peripheral magnetic circuit. Therefore, in the small-scale, high-speed operation scenarios of cleaning appliances, this structural design helps achieve smoother torque output, lower vibration and noise, and better magnetic circuit consistency, thus improving the feasibility of motor design and operational reliability.

[0136] Optionally, the first magnetic barrier includes an asymmetric magnetic barrier, which is a structure formed by translating and rotating the reference magnetic barrier.

[0137] In this embodiment, an asymmetric magnetic barrier can refer to a magnetic barrier structure in which the radial inner side and the circumferential two sides are straight lines. This asymmetric magnetic barrier is not a symmetric structure.

[0138] In one possible embodiment, the reference magnetic barrier can be a symmetrical arc-shaped magnetic barrier, a standard fan-shaped magnetic barrier, or a regular circular arc groove-shaped magnetic barrier, while the asymmetrical magnetic barrier can be a magnetic barrier structure obtained by a combination of translation and rotation based on the reference magnetic barrier.

[0139] The translation direction can be radial inward, radial outward, or circumferential offset, and the rotation direction can be clockwise or counterclockwise; however, this application does not specifically limit these aspects.

[0140] Optionally, in terms of morphology, the asymmetric magnetic barrier can be represented as a translated arc-shaped groove, a rotated oblique groove, or an offset groove formed by local trimming. Its radial inner side, circumferential side sides, and radial outer side can present a combination of straight line segments and arc segments, thereby forming a magnetic permeation path that is different from the reference magnetic barrier in a local area.

[0141] Optionally, in terms of size, the translation of the asymmetric magnetic barrier is usually less than a preset ratio of its characteristic arc length or characteristic width, the rotation angle is usually within the range that can avoid interference with adjacent magnetic barriers, outer magnetic bridges and rotor outer edges, and it should maintain a minimum gap with the surrounding magnetic barriers that is sufficient to meet the requirements of mechanical strength and electromagnetic insulation.

[0142] Based on the above structural design, compared with the local magnetic flux congestion and magnetic circuit repetitive saturation phenomenon that are easily formed in the existing magnetic barrier under symmetrical structure, the design of the asymmetric magnetic barrier in this application makes its local geometric center offset. Therefore, during the rotor rotation, the spatial harmonic components of the magnetic circuit can be weakened, the torque output waveform becomes smoother, and the torque pulsation and the resulting vibration and noise are also reduced.

[0143] At the same time, the asymmetric magnetic barrier, in conjunction with the outer magnetic bridge and the preceding magnetic barrier layer, can further optimize the local magnetic flux closure path while maintaining the overall strength and manufacturability of the rotor lamination 100. This allows the miniature synchronous reluctance motor to still obtain a relatively stable reluctance torque output in a confined space, which is beneficial for cleaning appliances to achieve lower noise, lower vibration and better energy efficiency under high-speed operation conditions.

[0144] For example, the synchronous reluctance motor rotor lamination design method provided in this application can be applied to the design of high-speed, miniaturized cleaning appliance motors. Figure 2 This is a schematic diagram of an application scenario provided in an embodiment of this application, such as... Figure 2 As shown, taking the design of synchronous reluctance motor rotor laminations in a robotic vacuum cleaner or handheld vacuum cleaner as an example, in this scenario, the motor needs to maintain stable performance at high-frequency speeds and meet the requirements of low vibration and low noise.

[0145] Taking a synchronous reluctance motor 200 used in a robotic vacuum cleaner as an example, the synchronous reluctance motor 200 has a power requirement of 100W, a speed range of 3000-5000rpm, and a volume limitation of 25mm outer diameter and 50mm length. Based on the above power requirements and volume limitations, the first dimensional parameters of the rotor lamination 100, the second dimensional parameters of the outer magnetic bridge, and the third dimensional parameters of the multi-layer magnetic barriers can be determined first.

[0146] Specifically, the outer diameter of the rotor lamination 100, i.e., the first dimensional parameter, is preset to 25mm, and the width of the outer magnetic bridge, i.e., the second dimensional parameter, is designed to be 1.5mm. The outer magnetic bridge has a concentric circle structure of equal width. By calculating the electromagnetic load and mechanical strength of the synchronous reluctance motor 200, the minimum width of the outer magnetic bridge is determined to meet the requirements of magnetic circuit continuity while ensuring the mechanical stability of the rotor structure. This yields the structural framework of the rotor lamination 100, which serves as the geometric constraint for subsequent magnetic barrier and magnetic bridge design.

[0147] Furthermore, considering the high-speed, low-vibration requirements and characteristics of the synchronous reluctance motor, the target number of multi-layer magnetic barriers is determined to be n+1. Taking n=2, the number of magnetic barrier layers is 3. Using the direction away from the center of the rotor lamination as a reference, the first two layers of magnetic barriers are defined as the second magnetic barrier, and the radial sides of each second magnetic barrier are concentric arcs. The layer closest to the center of the rotor lamination is defined as the first magnetic barrier, and the radial sides of the first magnetic barrier are non-concentric arcs.

[0148] Subsequently, based on the constructed two-layer second magnetic barrier and the third-layer first magnetic barrier, the dimensional parameters required for constructing each layer of magnetic barriers are extracted and used as the third dimensional parameters for the multi-layer magnetic barriers. Furthermore, after identifying the first magnetic barrier in the multi-layer magnetic barriers that is closest to the center of the rotor lamination, its position is adjusted while ensuring that the adjusted first magnetic barrier does not intersect with other magnetic barriers.

[0149] For example, the first magnetic barrier of the third layer is translated and rotated. The translation adjustment is to translate the first magnetic barrier of the third layer 0.3mm towards the center of the rotor to make its magnetic circuit distribution more balanced with the second magnetic barriers of the first two layers. The rotation adjustment is to rotate the first magnetic barrier of the third layer 10° to optimize its magnetic circuit connection with the magnetic bridge. The first magnetic barrier is an asymmetric magnetic barrier.

[0150] Then, the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter are used as the set of parameters to be adjusted. By adjusting at least one of the parameters in the set of parameters to be adjusted, the target structural parameters for determining the structure of the rotor lamination 100 are obtained. These target structural parameters are used to determine the structure of the rotor lamination 100.

[0151] For example, production drawings are created based on the aforementioned target structural parameters to be used as stamping dies for manufacturing rotor laminations 100.

[0152] Thus, the rotor lamination structure formed by the above design method can be applied to the synchronous reluctance motor 200 of a 100W, 3000-5000rpm, 25mm outer diameter, and 50mm length robotic vacuum cleaner. Through the above steps, the technical solution of this application achieves a high-performance, low-cost synchronous reluctance motor design in the design of robotic vacuum cleaner motors through parametric design and structural optimization coordinated control.

[0153] For example, Figure 3 A statistical diagram illustrating the torque fluctuation comparison of a synchronous reluctance motor provided in this application embodiment is shown below. Figure 3 As shown in Figure A, this illustrates the torque fluctuation trend corresponding to the existing technology for synchronous reluctance motor designs. Figure 3As shown in Figure B, this illustrates the torque fluctuation trend of a synchronous reluctance motor designed using the rotor lamination design method provided in this application. In contrast, in existing synchronous reluctance motor designs, all magnetic barriers in the rotor laminations are arc-shaped.

[0154] Depend on Figure 3 It is known that the torque fluctuation of the existing synchronous reluctance motor is large and the average value is low. Specifically, for example... Figure 3 As shown in Figure A, the average torque is 57.2 mNm, the torque fluctuation is 14.79 mNm, and the torque ripple value is 12.9%. However, the synchronous reluctance motor designed using the rotor lamination design method provided in this application exhibits significantly reduced fluctuation and a higher average value, as detailed below. Figure 3 As shown in Figure B, the average torque is 61.91 mNm, the torque fluctuation is 7.43 mNm, and the torque ripple value is 6%.

[0155] Therefore, the torque ripple of the synchronous reluctance motor designed using the rotor lamination design method provided in this application is optimized to within 7%, which is considered a relatively good level.

[0156] It should be noted that the execution subject of the method in this application embodiment can take many forms, such as: a terminal device with corresponding computing capabilities, a parametric design platform deployed in the cloud, a motor structure design system integrating finite element analysis functions, or a server providing computing services, etc. This application does not limit the specific form of the execution subject.

[0157] The technical solutions of this application and how the technical solutions of this disclosure solve the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings. An example is a terminal device with corresponding computing capabilities.

[0158] Figure 4 This is a flowchart illustrating a synchronous reluctance motor rotor lamination design method provided in an embodiment of this application, as shown below. Figure 4 As shown, the design method for the rotor laminations of this synchronous reluctance motor includes the following steps:

[0159] S401. Determine the first dimension parameters of the rotor laminations, the second dimension parameters of the external magnetic bridge, and the third dimension parameters of the multi-layer magnetic barriers in the synchronous reluctance motor, wherein there are magnetic bridge paths between the multi-layer magnetic barriers.

[0160] In this embodiment, the first dimensional parameter is used to define the basic outline and arrangement space of the rotor lamination, including at least the rotor outer diameter, shaft hole diameter, and minimum structural allowance related to stamping.

[0161] The second dimensional parameter is used to define the width, arc length position, radial thickness, and spacing relationship of the outer magnetic bridge with respect to the outer circle boundary.

[0162] For example, Figure 5 This application provides a schematic diagram of a scenario for determining a first size parameter and a second size parameter, as shown in the embodiments of this application. Figure 5 As shown, the preset rotor outer diameter is R1, and the preset width of the outer magnetic bridge is L1, where L1 = R1 - R2.

[0163] In this application, a multilayer magnetic barrier can refer to multiple cavities or low-permeability regions arranged in layers along the rotor radius within a single pole region, while the third dimensional parameter is used to define the number of magnetic barrier layers, the outline of each layer, the length, thickness, end position of each layer, and the spacing between adjacent layers.

[0164] In one possible embodiment, the multi-layered magnetic barriers can be constructed sequentially in either an outside-in or inside-out order.

[0165] If the structure is built from the outside in, the outline of the outermost magnetic barrier is determined based on the available space between the outer circle of the rotor and the outer magnetic bridge, and the position of the next magnetic barrier is derived based on the width of the reserved magnetic bridge passage. If the structure is built from the inside out, the starting position of the first magnetic barrier is determined based on the width of the remaining iron core outside the shaft hole, and then multiple magnetic barriers are formed by expanding outward layer by layer.

[0166] It should be noted that, regardless of the modeling order, a continuous magnetic bridge path is maintained between adjacent magnetic barriers, and the path width is constrained by the requirements of stamping strength, stacking stability, and magnetic circuit continuity.

[0167] In this embodiment, the magnetic bridge path may refer to the ferromagnetic connection region retained between adjacent magnetic barriers and between the magnetic barrier and the outer peripheral iron core, which is used to balance the reluctance torque and leakage magnetic characteristics.

[0168] For example, the terminal device can receive boundary input conditions of the synchronous reluctance motor, which include at least the rated speed, target output power, upper limit of installation space, stator-rotor mating air gap, shaft diameter, and rotor lamination thickness. Based on these input conditions, an initial geometric framework for the rotor laminations is established in the parametric model.

[0169] Specifically, the first dimension parameter can be determined by entering the outer radius of the rotor lamination, where the outer radius of the rotor is determined by the installation space and the inner diameter of the stator.

[0170] The determination of the second dimension parameter can be carried out around the outer magnetic bridge at the outer edge of each pole. The width of the outer magnetic bridge is set as the minimum continuous core width that meets the requirements of rotor lamination strength and high-speed rotating mechanical stress, and its coverage range in the circumferential direction is recorded simultaneously.

[0171] The determination of the third dimension parameter is based on the multi-layer magnetic barrier model. First, the total number of magnetic barrier layers is set, and then the position, length, thickness and end position of each magnetic barrier relative to the polar axis are given layer by layer to ensure the continuity of the stamping profile.

[0172] Based on the above analysis, it can be seen that by first establishing a unified parameter relationship between the rotor laminations, the outer magnetic bridge, and the multi-layer magnetic barriers, the geometric design that originally relied on repeated modifications based on experience under the constraints of small and micro-sized dimensions can be transformed into a calculable and interconnected parameter model, so that the subsequent correction of the position and angle of the first magnetic barrier has a clear constraint boundary.

[0173] S402. Determine the first magnetic barrier that is closest to the center of the rotor lamination in the multi-layer magnetic barrier, and adjust the position of the first magnetic barrier to determine the adjustment distance and rotation angle of the first magnetic barrier. The adjusted first magnetic barrier does not intersect with other magnetic barriers in the multi-layer magnetic barrier.

[0174] In this embodiment of the application, the first magnetic barrier may refer to the layer of magnetic barriers with the smallest minimum radial distance from its geometric profile to the center of the rotor lamination among the established multi-layer magnetic barriers, that is, the first magnetic barrier closest to the center region.

[0175] Optionally, the method for determining the distance differs depending on the shape of the first magnetic barrier. For example, for an arc-shaped magnetic barrier, the contour can be discretized into several nodes and the node distance can be calculated. For a magnetic barrier represented by a parametric curve, the minimum distance to the center of the circle can be directly obtained through the curve shortest distance solution module.

[0176] The adjustment distance can refer to the displacement of the first magnetic barrier relative to its initial position, at least representing the translational magnitude in the radial direction, and may also include the local coordinate correction along the polar axis.

[0177] The rotation angle can refer to the amount of angular deflection of the first magnetic barrier profile around a predetermined rotation center, which can be the geometric center of the first magnetic barrier, the midpoint of the center reference line, or a reference point specified by the parametric model.

[0178] In one possible embodiment, the distance adjustment can be a negative displacement radially toward the rotor center, bringing the first magnetic barrier closer to the central region; the rotation angle can be a small deflection around the geometric center, causing the first magnetic barrier and the outer magnetic barrier to form a misaligned arrangement.

[0179] It should be noted that there must be a magnetic bridge path between each layer of magnetic barriers, that is, the corresponding corners of each layer of magnetic barriers cannot intersect. This is to provide a magnetic flux conduction path for the iron core between adjacent magnetic barrier layers while ensuring the structural integrity and mechanical strength of the rotor laminations, thereby balancing the load-bearing capacity of the rotor during high-speed operation and the electromagnetic performance of the motor.

[0180] It should also be noted that after identifying the first magnetic barrier that is closest to the center of the rotor lamination among the multiple magnetic barriers, its position is adjusted while ensuring that the adjusted first magnetic barrier does not intersect with other magnetic barriers.

[0181] For example, the terminal device can read the contour data of all magnetic barriers, calculate the Euclidean distance from each sampling point on the contour of each layer of magnetic barriers to the center of the rotor lamination, and select the magnetic barrier corresponding to the smallest distance as the first magnetic barrier. After identifying the first magnetic barrier, a position adjustment model for the first magnetic barrier is established, which includes at least translation and rotation variables.

[0182] Among them, the translation variable can be defined as the radial inward or outward displacement distance along the polar axis where the first magnetic barrier is located, and the rotation variable can be defined as the clockwise or counterclockwise rotation angle relative to the initial placement posture.

[0183] Furthermore, the first magnetic barrier is kept as a rigid profile, and position changes are performed without changing its basic shape and hierarchical affiliation. First, the adjustment distance is scanned according to the set step size, and then the rotation angle is scanned according to the set angle step size, or the two variables are scanned simultaneously to obtain multiple candidate position states.

[0184] During the screening process for candidate position states, geometric determination of non-intersecting constraints is required. For example, for the adjusted first magnetic barrier profile and the adjacent second magnetic barrier profile, the minimum gap between their boundary curves is calculated; when the minimum gap is greater than or equal to the preset safety margin, they are considered non-intersecting; when there is an intersection point at the boundary or the minimum gap is less than zero, they are considered intersecting and the candidate state is eliminated.

[0185] Optionally, if the magnetic barrier is represented by a closed polygon, the existence of overlapping regions can be determined by polygon Boolean operations; if the magnetic barrier is represented by a spline curve, the determination can be completed by combining curve intersection and discrete bounding box pre-screening with precise intersection.

[0186] Optionally, this application also verifies the continuity between the first magnetic barrier and the magnetic bridge path after adjustment, that is, checks whether a continuous ferromagnetic connection area is still maintained between the outer side of the first magnetic barrier and the adjacent magnetic barrier, and between the end of the first magnetic barrier and the surrounding iron core. If an adjustment causes a local iron core bridge to break or the channel width to be lower than the minimum manufacturing width, the corresponding adjustment state shall not be adopted.

[0187] Based on the above analysis, it can be seen that the first magnetic barrier is located near the center of the rotor. Its position and angle changes directly affect the magnetic circuit turning mode of the first magnetic barrier and the local coupling relationship between each layer of magnetic barriers. Under the condition of limited available space in the micro synchronous reluctance motor, constrained translation and rotation of the first magnetic barrier can correct the geometric relationship near the center region without disrupting the multi-layer magnetic barrier hierarchical structure, and provide a directional correction amount for subsequent overall parameter adjustment.

[0188] S403. Adjust at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, and the rotation angle to obtain the target structural parameters for determining the rotor lamination structure.

[0189] In this embodiment, the target structural parameters refer to a set of parameters used to determine the rotor lamination profile after parameter adjustment, including at least the basic dimensions of the rotor lamination, the geometric parameters of the multi-layer magnetic barriers, the dimensions of the outer magnetic bridge, and the position and attitude parameters of the first magnetic barrier. These target structural parameters are used to determine the rotor lamination structure.

[0190] Optionally, at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, and the rotation angle can be adjusted by means of successive adjustment or combined adjustment.

[0191] When using the successive adjustment method, at least some of the parameters among the first dimension parameter, second dimension parameter, third dimension parameter, adjustment distance, and rotation angle can be fixed, and only one of these parameters can be adjusted. This process is repeated until the target structural parameters that meet the requirements are obtained.

[0192] For example, first fix the first and third dimension parameters, adjust the distance and rotation angle, and only change the second dimension parameter to analyze the impact of the change in the width of the outer magnetic bridge on the overall geometric feasibility. After determining the second dimension parameter, adjust the values ​​of other parameters.

[0193] When using the joint adjustment method, at least two of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, and the rotation angle are simultaneously input into the solver as linkage variables, and the solver generates the target structural parameters under the constraints.

[0194] In one possible embodiment, parameter adjustment can also adopt a hierarchical priority order, first processing the second size parameter and rotation angle, then processing the adjustment distance and third size parameter, and finally completing the overall boundary convergence with the first size parameter.

[0195] This approach decomposes the coupling relationship between parameters into three stages: peripheral magnetic circuit correction, first magnetic barrier position correction, and overall profile calibration, ensuring that each adjustment revolves around specific geometric variables.

[0196] In another possible embodiment, a joint solution approach can be used. All parameters are input into the optimization program, and the target structural parameters are automatically searched under constraints of geometric non-intersection, continuous magnetic bridge path, and minimum manufacturing width. The resulting target structural parameters can be directly used to generate rotor lamination patterns, stamping die outlines, or subsequent lamination models.

[0197] Based on the above analysis, it can be seen that this step incorporates the rotor lamination size, outer magnetic bridge size, multi-layer magnetic barrier size, and the position and attitude of the first magnetic barrier into a unified adjustment framework. This makes the design process no longer dependent on single experience adjustments, but obtains the rotor lamination structure through constrained parameter adjustments. Thus, it balances magnetic circuit layout and structural compactness within the limited space of a micro synchronous reluctance motor, and transfers the local correction formed by the adjustment of the first magnetic barrier near the center region to the overall rotor structure.

[0198] In this way, compared with the problem of complex rotor structure design and large amount of calculation in traditional synchronous reluctance motors, this application first establishes an initial parameter system for rotor laminations, external magnetic bridges and multi-layer magnetic barriers, then performs geometrically constrained position and angle corrections around the first magnetic barrier near the center, and then adjusts the relevant dimensional parameters to form target structural parameters that can be directly used to determine the rotor lamination structure.

[0199] The above-described processing steps link the correction of the first magnetic barrier with the overall contour adjustment, enabling the miniature synchronous reluctance motor to achieve a coordinated arrangement of multiple magnetic barriers and magnetic bridge paths within a limited space. This also ensures a clear adjustment sequence and output result for the rotor design process. Therefore, the design method provided in this application can significantly reduce the number of parameters required during the design process, making the design of rotor laminations simpler and easier, thereby greatly shortening the motor design cycle, accelerating product development, and facilitating rapid response to market demands.

[0200] Furthermore, addressing the limitation of synchronous reluctance motors in the application of small and micro-sized cleaning appliances, this application simplifies the design method of the lamination structure, enabling more convenient optimization of the rotor lamination structure and effectively improving the motor's torque ripple. This not only enhances the motor's operational smoothness and quietness but also improves its overall performance and quality, enabling it to meet the drive motor requirements of high-speed cleaning products such as robotic vacuum cleaners and robot vacuums.

[0201] Optionally, the process of determining the third dimension parameter of the multi-layer magnetic barrier includes: determining the target number of layers of the multi-layer magnetic barrier as n+1, where n is an integer greater than or equal to 1, based on the motor characteristics of the synchronous reluctance motor; determining that the radial sides of the second magnetic barrier in the first n layers are concentric arcs, and that the radial sides of the first magnetic barrier are non-concentric arcs, with the direction away from the center of the rotor lamination as the reference; determining the concentric circle parameter corresponding to each second magnetic barrier, and the non-concentric circle parameter corresponding to the first magnetic barrier; and determining the third dimension parameter of the multi-layer magnetic barrier based on the concentric circle parameter and the non-concentric circle parameter.

[0202] In this embodiment of the application, the motor characteristics can refer to the inherent physical properties and performance indicators exhibited by the synchronous reluctance motor during electromagnetic and mechanical operation, mainly including torque pulsation, power factor, speed range and rotor lamination thickness, etc. This embodiment of the application does not limit the specific content corresponding to the motor characteristics.

[0203] The radial sides can refer to the boundary contours of the rotor lamination magnetic barriers distributed along the rotor radius (i.e., from the center to the outer edge), specifically including the upper side near the outer edge of the rotor and the lower side near the center of the rotor.

[0204] Non-concentric arcs can refer to arcs whose geometric center does not coincide with the physical center of the rotor lamination, meaning that the arc segment does not have the same center of curvature as the outer or inner circle of the rotor.

[0205] For example, the terminal device can perform constraint calculations on the number of magnetic barrier layers that can be accommodated based on the motor characteristics of the synchronous reluctance motor, thereby determining the target number of n+1 layers, and setting the last layer closest to the center as the first magnetic barrier, and the remaining n layers as the second magnetic barrier.

[0206] Then, taking the radial direction away from the center as a reference, the corresponding concentric center, inner and outer arc radii, and magnetic barrier radial width are set for each layer of the second magnetic barrier, and the relative positions between each layer are determined according to the gap requirements between adjacent magnetic barriers.

[0207] For the first magnetic barrier, under the premise of satisfying the reserved space and the connection relationship of the magnetic bridge, a different center position is set from that of the second magnetic barrier, and a non-concentric circular arc boundary is formed by combining its radius, width and circumferential extension length parameters.

[0208] Furthermore, based on the parameters such as the center, radius, width, and length of each magnetic barrier, a third dimensional parameter is obtained and used to construct the magnetic barrier profile of the subsequent rotor lamination. Among them, the parameters such as the center, radius, width, and length corresponding to the second magnetic barrier constitute concentric circle parameters, while the parameters such as the center, radius, width, and length corresponding to the first magnetic barrier constitute non-concentric circle parameters.

[0209] It should be noted that the parameters of concentric circles and non-concentric circles can be generated by geometric modeling or can be deduced and corrected from the electromagnetic simulation results. This application does not impose specific limitations on this.

[0210] Optionally, taking the construction of a 3-layer magnetic barrier as an example, the first two layers of the second magnetic barrier are designed as symmetrical structures, while the third layer of the first magnetic barrier is designed as an asymmetrical structure, and the radial inner side and circumferential side of the third layer of the first magnetic barrier are straight lines. Magnetic bridge paths are preserved between the multiple layers of magnetic barriers to form a continuous magnetic circuit.

[0211] Based on the above analysis, this application determines the number and structure of magnetic barriers by measuring motor performance, and then constrains the boundary morphology of the second and first magnetic barriers respectively, so that the geometric relationship of the multi-layer magnetic barriers can be expressed parametrically, and the layered structure is uniformly mapped to a third dimension parameter, thereby providing a directly callable dimension basis for the overall design of rotor laminations.

[0212] Therefore, after determining the third dimension parameter using the above method, the number of layers, arc shape, and parameter relationship of the multi-layer magnetic barrier can be represented by a unified set of dimension parameters. This enables the optimized design of magnetic circuit performance and structural adaptability within a limited space, which helps to coordinate with the design of other structures such as the external magnetic bridge and rotor laminations, and provides a clear source of parameters and boundary constraints for subsequent structural adjustments.

[0213] Optionally, based on concentric circle parameters and non-concentric circle parameters, the third size parameters of the multi-layer magnetic barrier are determined, including: constructing n layers of second magnetic barriers based on concentric circle parameters, and constructing a first magnetic barrier based on non-concentric circle parameters; and determining the third size parameters of the multi-layer magnetic barrier based on the size parameters required to construct the n layers of second magnetic barriers and the first magnetic barrier.

[0214] In practical implementation, the terminal device can establish the geometric model of the first n layers of the second magnetic barrier based on the preset concentric circle parameters. Each layer of the second magnetic barrier can be formed by two radial sides of the concentric circle arc. The center of the arc can be taken from the same reference circle center. The radius can be set to increase or decrease according to the layer sequence. The width is used to limit the opening size of the magnetic barrier.

[0215] Subsequently, a geometric model of the first magnetic barrier is established based on the non-concentric circle parameters. The first magnetic barrier can adopt an arc-shaped boundary with a different center than the aforementioned second magnetic barrier. Its bottom structure can be defined by the arc segment and length parameters, and its side structure can be determined by combining the endpoint position and the angle between the partition line, thereby creating a spatially differentiated distribution between the first and second magnetic barriers.

[0216] After completing the geometric modeling of the n-layer second magnetic barrier and the first magnetic barrier, the dimensional parameters such as the center, radius, width and length required to construct each magnetic barrier are summarized and mapped to obtain the third dimensional parameter used to characterize the overall size of the multi-layer magnetic barrier.

[0217] It should be noted that the third dimensional parameter can be further used for subsequent rotor lamination contour constraints and magnetic barrier spacing verification to ensure that each layer of magnetic barriers meets the preset layout relationship within the limited rotor lamination space. Through the above parameter design, concentric and non-concentric circular structures can be collaboratively determined under the same design framework, thereby forming a multi-layer magnetic barrier parameter set suitable for small and micro synchronous reluctance motors.

[0218] In this way, the local configuration of the layered magnetic barrier is converted into a unified third dimension parameter, which facilitates subsequent structural adjustments and batch design, and ensures that the geometric relationship of the multi-layered magnetic barrier remains consistent and traceable.

[0219] Optionally, based on concentric circle parameters, an n-layer second magnetic barrier is constructed, including: on the outer side of the rotor lamination, pre-setting concentric circle parameters corresponding to the n-layer second magnetic barrier, the concentric circle parameters including a first center, a first radius, and a first width; constructing a first arc based on the first center and the first radius; constructing a second arc based on the first center, the sum of the first radius, and the first width; determining the second magnetic barrier based on the first arc and the second arc, wherein the first centers of the first n layers of the second magnetic barrier do not coincide; the distance between the first arc and the second arc is equal to the first width.

[0220] In this application, after the number of layers of the second magnetic barrier is determined, the terminal device can configure a corresponding first center, first radius and first width for each layer of the second magnetic barrier.

[0221] The first center can be set radially offset according to the interlayer position, the first radius can be determined according to the distance of each magnetic barrier from the center of the rotor lamination, and the first width can be set as a fixed value or a layer difference value according to the thickness of the second magnetic barrier.

[0222] It should be noted that the embodiments of this application do not limit the setting position of the first center, or the specific values ​​corresponding to the first radius and the first width.

[0223] For example, two concentric circle parameters corresponding to the second magnetic barriers are preset on the outer side of the rotor lamination. The concentric circle parameters include a first center, a first radius, and a first width. For each layer of the second magnetic barrier, a first arc is constructed based on the corresponding first center and first radius. Then, a second arc is constructed based on the same first center and the sum of the first radius and the first width. The area between the first arc and the second arc determines the corresponding second magnetic barrier. The distance between the first arc and the second arc is equal to the first width. The first centers of the first two layers of the second magnetic barriers do not coincide.

[0224] The first center, first radius, and first width of the second magnetic barrier in the first two layers are determined by calculation to meet the requirements of magnetic circuit symmetry.

[0225] For example, Figure 6 A design drawing for constructing a magnetic barrier is provided for an embodiment of this application, such as... Figure 6 As shown, taking a second magnetic barrier with two layers as an example, with a preset first center O1, a first radius Rb1, and a first width B1, the first layer of the second magnetic barrier is constructed. Then, the center of the lower arc (second arc) of the first layer of the second magnetic barrier is O1, and the radius is Rb1+B1. The center of the upper arc (first arc) of the first layer of the second magnetic barrier is O1, and the radius is Rb1.

[0226] Similarly, with a preset first center O2, a first radius Rb2, and a first width B2, a second magnetic barrier is constructed. Then, the center of the lower arc (second arc) of the second magnetic barrier is O2, and the radius is Rb2+B2. The center of the upper arc (first arc) of the second magnetic barrier is O2, and the radius is Rb2.

[0227] Understandably, if there are multiple layers of the second magnetic barrier, a similar method can be used to determine the center and radius of the first and second arcs of each layer. The arc-shaped region enclosed between the two arcs constitutes each layer of the second magnetic barrier. The first centers of each layer of the second magnetic barrier do not coincide, resulting in a layered distribution of the magnetic barriers in space. Furthermore, the distance between the first and second arcs is equal to the first width, ensuring that the dimensions of each layer of magnetic barriers are consistent.

[0228] It should be noted that the upper and lower arcs are distinguished by the direction away from the center of the rotor lamination, and the direction closer to the center of the rotor lamination is the lower arc.

[0229] Optionally, the above-mentioned arc can be constructed by modeling with drawing and drafting software or by generating it based on concentric circle parameters using parametric geometry. In practical applications, other implementation methods can also be selected for this modeling method, and this application does not make specific limitations on this.

[0230] Therefore, by using the first center and first radius of different levels to control the positional relationship of each second magnetic barrier, and then using the first width to uniformly limit the radial thickness of each layer of magnetic barriers, multiple layers of second magnetic barriers can be stably arranged on the outside of the rotor lamination according to a preset geometric relationship, and cooperate with the subsequent magnetic bridge structure to form a continuous magnetic circuit.

[0231] In this way, after constructing the second magnetic barrier using the above construction method, the geometric boundary of the second magnetic barrier can be uniformly parameterized and defined. The width and positional relationship of each layer of magnetic barriers remain consistent, which facilitates the structural design and reuse calculation of rotor laminations. At the same time, it reduces the layout deviation caused by the irregularity of the magnetic barrier boundary and makes the size control of the multi-layer magnetic barriers clearer.

[0232] Optionally, a first magnetic barrier is constructed based on non-concentric circle parameters, including: pre-setting non-concentric circle parameters corresponding to the first magnetic barrier on the outside of the rotor lamination, the non-concentric circle parameters including a second center, a second radius, a second width, and a length parameter; constructing a third arc based on the second center and the second radius, and constructing the bottom structure of the first magnetic barrier based on the third arc, the second width, and the length parameter; determining the endpoint positions of both ends of the bottom structure, and the included angle between the endpoint positions and the partition line; the partition line is the dividing line that divides the rotor lamination into multiple regions, and each region is used to accommodate n+1 layers of magnetic barriers; constructing the side structure of the first magnetic barrier based on the endpoint positions and the included angle; and determining the first magnetic barrier based on the third arc, the bottom structure, and the side structure.

[0233] In this step, when constructing the first magnetic barrier, the terminal device can determine the third arc based on the second center and the second radius, and then use the third arc as a reference to form the bottom structure in combination with the second width and length parameters, so that the bottom structure meets the preset contour in both the radial and circumferential directions.

[0234] Furthermore, the terminal device can determine the endpoint positions at both ends of the bottom structure and calculate the angle between the endpoint positions and the partition lines to match the orientation of the side structure with the area division. Then, based on the endpoint positions and the angles, the side structure is extended to form the side structure. The third arc, the bottom structure, and the side structure together form the closed boundary of the first magnetic barrier to determine the shape of the first magnetic barrier.

[0235] For example, after completing the construction of the second magnetic barrier layer 2, the terminal device can preset the non-concentric circle parameters corresponding to the third magnetic barrier layer on the outside of the rotor lamination. The non-concentric circle parameters include the second circle center, second radius, second width, and length parameters. Based on the second circle center and second radius, a third arc is constructed, and the bottom structure of the third magnetic barrier layer 1 is constructed by combining the third arc, second width, and length parameters.

[0236] When forming the bottom structure, first determine the positions of the endpoints at both ends of the bottom structure, and then determine the angle between each endpoint position and the partition line. The partition line is the dividing line that divides the rotor laminations into multiple regions, each region accommodating three layers of magnetic barriers. Next, based on the endpoint positions and the angles, construct the side structure of the third layer of the first magnetic barrier, and combine the third arc, the bottom structure, and the side structure to obtain the third layer of the first magnetic barrier. This third layer of the first magnetic barrier is then adjusted through translation and rotation to coordinate with the first two layers of the second magnetic barriers, forming the initial layout of three layers of magnetic barriers.

[0237] Subsequently, based on the constructed two-layer second magnetic barrier and the third-layer first magnetic barrier, the required size parameters for constructing each layer of magnetic barriers are extracted and used as the third size parameters for the multi-layer magnetic barrier.

[0238] Specifically, such as Figure 6 As shown, a second center O3 and a second radius Rb3 are preset to form the upper arc (third arc) of the first magnetic barrier in the third layer. Furthermore, the center thickness (second width) of the first magnetic barrier is preset to B3, and the bottom edge length (length parameter) is preset to C1 to construct the bottom structure of the first magnetic barrier. The second width refers to the distance between the third arc and the bottom structure.

[0239] After constructing the bottom structure of the first magnetic barrier, the positions of the endpoints at both ends of the bottom structure are determined, so as to... Figure 6Taking the left end point as an example, determine the end point Q. Using Q as the base point and the angle between Q and the partition line as θ, construct the side structure of the first magnetic barrier. Similarly, perform the same operation design for the right end point to obtain the side structure of the other side. Combining the third arc, bottom structure and side structure mentioned above, the first magnetic barrier is obtained.

[0240] In this way, by setting the first magnetic barrier as a non-concentric circular profile and using the angle between the endpoint position and the partition line to constrain the direction of the side structure, the first magnetic barrier can be adapted to the regional arrangement relationship of the multi-layer magnetic barriers. Since there is a clear parametric relationship between the bottom structure, the side structure, and the third arc, the geometry of the first magnetic barrier can be stably determined, thus providing a consistent modeling basis for the magnetic barrier arrangement of the rotor laminations and facilitating subsequent dimensional matching, thereby shortening the design cycle.

[0241] Optionally, at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, and the rotation angle is adjusted to obtain the target structural parameters for determining the rotor lamination structure, including: determining the width parameter of the target magnetic bridge corresponding to the middle part of the multi-layer magnetic barrier, wherein the length of the target magnetic bridge covers at least part of the multi-layer magnetic barrier; and adjusting at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter to obtain the target structural parameters for determining the rotor lamination structure.

[0242] In this embodiment of the application, the width parameter is used to determine the area in the middle part of the magnetic barrier where a magnetic bridge passage can be formed, i.e., the target magnetic bridge.

[0243] The length of the target magnetic bridge can be set to cover at least part of the magnetic barrier layers in the multi-layer magnetic barrier, so that it can maintain the magnetic circuit connection while retaining the adjustment space of the first magnetic barrier. When there are many magnetic barrier layers, the length of the target magnetic bridge can cover several magnetic barrier layers other than the first layer, or only cover part of the magnetic barrier layers, in order to match different rotor shapes and air gap constraints. The embodiments of this application do not specifically limit the number of target magnetic barriers.

[0244] Optionally, the terminal device can determine the area in the middle part that can form a magnetic bridge passage based on the number of layers, the spacing between layers, and the relative position of the magnetic barriers to the center of the circle. Then, the radial thickness, circumferential span, and avoidance conditions of the adjacent magnetic barriers in this area are used as constraints to obtain the width parameters of the target magnetic bridge.

[0245] For example, Figure 7 A design drawing of an intermediate magnetic bridge provided for an embodiment of this application, such as... Figure 7 As shown, in each divided region of the rotor lamination, an intermediate magnetic bridge (target magnetic bridge) is set along the symmetrical line of the partition center, and the width of the intermediate magnetic bridge is designed to be H, that is, the width parameter of the target magnetic bridge is H.

[0246] After obtaining the width parameter of the target magnetic bridge, the terminal device can use it together with the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance and the rotation angle as parameters to be adjusted, update the geometric relationship of the rotor lamination using parametric modeling, and output the target structural parameters.

[0247] It should be noted that the design of relevant parameters in this application can be determined by drawing and drafting software for lamination modeling, finite element simulation or parameter optimization programs, and this application embodiment does not specifically limit this.

[0248] Optionally, the length of the target magnetic bridge can cover all magnetic barriers, or it can cover all magnetic barriers except for the first layer of the second magnetic barrier. This application embodiment does not specifically limit this.

[0249] Based on the above structural design of the target magnetic bridge, a constrained continuous magnetic circuit is formed between the target magnetic bridge and the multi-layer magnetic barriers. As a result, the rotor lamination structure after parameter adjustment can express the matching relationship between the magnetic bridge coverage and the magnetic barrier size in a more explicit way, so that the target structural parameters have determinism that can be directly used for drawing and simulation.

[0250] Therefore, after adopting the above implementation method, the magnetic bridge width, coverage length and related shape parameters of the rotor lamination can be determined in a coordinated manner, reducing the uncertainty caused by repeated trial calculations of multiple parameters, and making the structure of the rotor lamination more suitable for the compact arrangement and stable design of micro synchronous reluctance motors.

[0251] Optionally, the length of the target magnetic bridge covers all magnetic barriers in the multi-layer magnetic barrier except for the third magnetic barrier, which is the magnetic barrier in the multi-layer magnetic barrier that is farthest from the center of the rotor lamination.

[0252] In this application, after the target magnetic bridge covers all magnetic barriers except the third magnetic barrier, the magnetic flux can establish a continuous path between the target magnetic bridge and the covered magnetic barriers. Since the third magnetic barrier is not covered by the target magnetic bridge, it still retains the corresponding outer space and hierarchical relationship, making the geometric hierarchy of the multi-layer magnetic barriers clearly distinguishable.

[0253] It should be noted that the third magnetic barrier corresponds to the second magnetic barrier of the first layer.

[0254] When designing the target magnetic barrier, the outermost position of the third magnetic barrier relative to the center of the rotor lamination can be determined, and then this outermost position can be used as the termination boundary of the target magnetic bridge length. Subsequently, the target magnetic bridge can be extended to the area where the other magnetic barriers are located, and the integrated rotor lamination contour definition can be completed.

[0255] In this way, after adopting the above structural design, the target magnetic bridge can provide continuous support and magnetic flux connection for the multi-layer magnetic barriers except for the third magnetic barrier, while the third magnetic barrier remains in an independent arrangement with the furthest distance from the center. This makes the hierarchical relationship of the magnetic barriers clear, the geometric boundary of the rotor lamination easier to control, and provides a stable data basis for subsequent magnetic circuit distribution and structural parameter adjustment.

[0256] Optionally, the first magnetic barrier includes a first left magnetic barrier and a first right magnetic barrier, which are distributed on both sides of the target magnetic bridge; adjusting the position of the first magnetic barrier to determine the adjustment distance and rotation angle of the first magnetic barrier includes: determining the position of the first left magnetic barrier and the first right magnetic barrier; adjusting the position of either the first left magnetic barrier or the first right magnetic barrier to move it, and determining the adjustment distance of the first magnetic barrier; rotating the moved magnetic barrier to determine the rotation angle of the first magnetic barrier.

[0257] In this embodiment, the positions of the first left magnetic barrier and the first right magnetic barrier are the initial positions of the first magnetic barrier before adjustment, which are usually preset based on the symmetry between the number of magnetic barrier layers and the rotor laminations.

[0258] The adjustment distance is the translational distance of the first magnetic barrier in the radial direction, which is perpendicular to the straight line direction of the rotor lamination rotation axis, based on the initial position. This radial direction is used to describe the translational adjustment direction of the magnetic barrier.

[0259] It should be noted that the first left magnetic barrier and the first right magnetic barrier are used to distinguish the two sub-barriers that correspond to the first magnetic barrier after it is separated by the target magnetic bridge, and are distinguished by the left half and the right half.

[0260] The first left magnetic barrier and the first right magnetic barrier can be formed by stamping the notched area in the rotor lamination. The stamping boundary is integrally formed with the rotor silicon steel sheet. In practical applications, other forming methods can also be selected. This application does not make specific limitations on this.

[0261] In this step, the terminal device can determine the initial coordinates of the first left magnetic barrier and the first right magnetic barrier based on the geometric profile of the rotor lamination, and then select any one of the magnetic barriers to move along the radial direction or the offset direction related to the target magnetic bridge. The amount of movement is used as the adjustment distance of the first magnetic barrier.

[0262] Furthermore, the moved magnetic barrier can rotate around its own center or a preset rotation center by a certain angle. After rotation, a new spatial relationship is formed between it and the target magnetic bridge and adjacent magnetic barriers. The corresponding amount of deflection is the rotation angle of the first magnetic barrier.

[0263] For example, Figure 8 This is a design drawing of an asymmetric magnetic bridge provided in an embodiment of this application. Figure 8As shown, by moving the left half of the first magnetic barrier of the third layer downward, the downward movement distance (adjustment distance) ΔY is determined. During the downward movement of the left half, the endpoint position Q of the left end of the bottom structure also moves downward accordingly. At this time, the endpoint position after the downward movement is determined to be point Q2.

[0264] Using point Q2 as the base, rotate the left half by an angle δ. Optionally, the rotation can be clockwise or counterclockwise by δ. Clockwise rotation can be recorded as +δ, and counterclockwise rotation as -δ, for easy identification of the rotation direction later.

[0265] It should be noted that the embodiments of this application do not specifically limit the direction of rotation, as long as it is ensured that the magnetic barrier after movement and rotation does not intersect with other magnetic barriers, nor with the partition line.

[0266] For example, Figure 9 A design drawing of a rotor lamination provided for an embodiment of this application, such as... Figure 9 As shown, point P corresponding to the first left magnetic barrier after movement and rotation does not intersect the partition line. Thus, after designing the magnetic barrier, the intermediate magnetic bridge, and the asymmetric magnetic bridge, the following result is obtained: Figure 9 The rotor laminations shown.

[0267] In this way, by splitting the first magnetic barrier into a first left magnetic barrier and a first right magnetic barrier, and adjusting the displacement and rotation of either magnetic barrier around the target magnetic bridge, the spatial position and angular relationship of the first magnetic barrier can be quantitatively characterized and used as the basis for subsequent rotor lamination parameter correction. Therefore, the relative arrangement between the first magnetic barrier and the target magnetic bridge can be precisely controlled, resulting in a more consistent magnetic circuit distribution of the rotor laminations, reducing local magnetic circuit distortion, and giving the structural adjustment process repeatable parametric characteristics.

[0268] Optionally, at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter is adjusted to obtain the target structural parameters for determining the rotor lamination structure. This includes: performing parametric simulation analysis on the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter to obtain the torque fluctuation result corresponding to the synchronous reluctance motor; if the torque fluctuation result does not meet the preset conditions, at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter is adjusted, and parametric simulation analysis is performed again until the torque fluctuation result obtained from the re-parametric simulation analysis meets the preset conditions; the parameter corresponding to the torque fluctuation result meeting the preset conditions is used as the target structural parameter.

[0269] In this embodiment of the application, parametric simulation analysis can refer to the analysis process of using the set of parameters to be adjusted of the rotor laminations as variable inputs, and obtaining the electromagnetic performance response results of the motor under different parameter combinations through finite element electromagnetic simulation calculations.

[0270] Torque ripple results can refer to the fluctuation amplitude of the output torque of a motor within one electrical cycle as the rotor position changes, obtained through parametric simulation analysis. It is usually characterized by torque pulsation.

[0271] Optionally, the torque fluctuation result can be peak-to-peak value, root mean square value, or pulsation coefficient, etc. The embodiments of this application do not limit the numerical type corresponding to the torque fluctuation result.

[0272] The preset conditions can refer to the allowable threshold range of torque fluctuation results pre-set according to the actual application requirements of the motor. When the torque fluctuation result obtained from the simulation is within this threshold range, it is determined that the current parameter combination meets the design requirements and can be output as the target structural parameters. For example, the preset condition can be that the torque pulsation is not higher than a set threshold. The embodiments of this application do not specifically limit the content corresponding to the preset conditions.

[0273] For example, the terminal device can establish an electromagnetic simulation model of a synchronous reluctance motor based on the geometric model of the rotor lamination. The first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle and the width parameter are set as the set of parameters to be adjusted. Then, the material magnetic properties, speed boundary conditions and current excitation conditions are applied to obtain the instantaneous torque curve within one electric cycle. The peak-to-peak value, root mean square value or pulsation coefficient are extracted from the instantaneous torque curve as the torque fluctuation result.

[0274] When the torque fluctuation result does not meet the preset conditions, at least one parameter can be adjusted in a preset order, and the simulation calculation can be re-executed to form iterative optimization until the target structural parameters that meet the preset requirements are obtained. The target structural parameters are used to determine the actual structural dimensions of the rotor laminations.

[0275] Among them, such as Figures 5-8 As shown, taking a rotor lamination with 4 regions and 3 layers of magnetic barriers in each region as an example, the set of parameters to be adjusted may include: rotor outer diameter R1, width of outer magnetic bridge L1, first center O1 (0, y1), first radius Rb1, first width B1 of the second magnetic barrier of the first layer, first center O2 (0, y2), first radius Rb2, first width B2 of the second magnetic barrier of the second layer, second center O3 (0, y3), second radius Rb3, second width B3 of the first magnetic barrier of the second layer, length parameter C1, included angle θ, width of middle magnetic bridge H1, downward displacement ΔY and rotation angle δ.

[0276] It should be noted that in constructing rotor laminations, it is also necessary to ensure that there are magnetic bridge pathways between multiple layers of magnetic barriers, that is, the distances corresponding to L2, L3, L4, L5 and L6 are all greater than 0.

[0277] Furthermore, based on parametric simulation analysis, at least some of the parameter values ​​in the aforementioned set of parameters to be adjusted are adjusted, and the torque fluctuation value is calculated through electromagnetic simulation. The preset condition for torque ripple is below 7%. If the torque fluctuation result does not meet this preset condition, the values ​​of at least some of the parameters in the set of parameters to be adjusted are adjusted again, and parametric simulation analysis is performed again. Through multiple rounds of simulation iteration, the torque ripple is gradually converged to the target range of below 7% until the torque fluctuation result meets the preset condition. At this point, the corresponding parameter is determined as the target structural parameter of the rotor lamination structure.

[0278] In this way, by establishing a correspondence between geometric dimensions, magnetic barrier positions, and magnetic bridge width and torque fluctuations through parametric simulation, and using the target structural parameters that meet the preset conditions as output, the rotor lamination structure can be quantitatively screened and converged during the design stage, thereby obtaining the target structural parameters suitable for small and micro synchronous reluctance motors.

[0279] Therefore, after determining the target structural parameters using simulation, the simulation optimization results can directly correspond to the structural parameters required for manufacturing. This allows the design process to optimize parameters around specific indicators, ensuring that the generated target structural parameters can accurately achieve the expected performance, reducing the number of repeated trials and errors, and making the obtained rotor lamination structure closer to the predetermined low fluctuation requirements.

[0280] Optionally, adjusting at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter includes: prioritizing the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter to obtain multiple parameter sets with different priority levels, wherein each parameter set has a different degree of influence on the torque fluctuation of the synchronous reluctance motor; based on the torque fluctuation results, adjusting the values ​​of at least some parameters in each parameter set level by level according to the priority level.

[0281] In this embodiment, the priority level refers to the order of adjustment assigned manually or through an algorithm based on the degree of influence of various parameters on torque ripple. It is typically divided into multiple levels such as high, medium, and low. This embodiment does not specifically limit the number of priority levels.

[0282] The degree of influence can refer to the sensitivity of parameter changes to torque pulsation, which is usually quantified through simulation analysis.

[0283] It should be noted that the influence of the rotor core magnetic barrier of a synchronous reluctance motor on the motor torque and torque fluctuation is mainly on the dq axis magnetic circuit. That is, the greater the inductance difference of the dq axis magnetic circuit, the greater the reluctance torque. The torque fluctuation is mainly related to the leakage magnetic characteristics of the magnetic circuit and the air gap harmonics. The size and shape of the magnetic bridge of the rotor laminations affect these characteristics, thus affecting the magnitude of the torque fluctuation.

[0284] Therefore, the third dimensional parameter corresponding to the multi-layer magnetic barrier has a significant impact on the rotor lamination design structure. Thus, the first, second, and third dimensional parameters, adjustment distance, rotation angle, and width parameters are prioritized based on their influence on torque fluctuations. The greater the influence, the higher the priority, resulting in multiple parameter sets with different priority levels.

[0285] For example, the parameters corresponding to the highest priority include: Rb1, Rb2, Rb3, B1, B2, L2 and L3; the parameters corresponding to the medium priority include R1, L1, B3, y1, y2, y3, H1 and θ; and the parameters corresponding to the low priority include ΔY, δ and C1.

[0286] It should be noted that higher priority parameters usually correspond to structural areas with stronger magnetic circuit coupling of rotor laminations. Prioritizing the adjustment of these areas can quickly reduce torque fluctuation deviations, while lower priority parameters are used for finer compensation based on previous adjustments.

[0287] To facilitate understanding of the dq axis, Figure 10 This is a scene diagram of the dq axis provided in an embodiment of this application, as shown below. Figure 10 As shown, the d-axis (direct axis) in the dq axis is the axis aligned with the direction of the rotor's main magnetic field, representing the effective component that generates the flux linkage / magnetic field. In a synchronous reluctance motor, the d-axis corresponds to the direction of minimum magnetic reluctance, i.e., the path through which magnetic lines of force are most easily traversed.

[0288] In the dq axis, the q-axis (quadrature axis) leads the d-axis by 90 electrical degrees and represents the effective component that generates electromagnetic torque. In a synchronous reluctance motor, the q-axis corresponds to the direction of maximum magnetic reluctance, i.e., the path where magnetic lines of force are most difficult to traverse. However... Figure 10 The angle between the d-axis and q-axis is 45 degrees in physical space because the motor rotor has 2 pairs of magnetic poles (i.e., 4 poles). When the number of pole pairs is 2, a 90-degree electrical angle corresponds to a 45-degree mechanical angle.

[0289] For example, the terminal device can establish a torque fluctuation evaluation model for a synchronous reluctance motor based on parametric simulation. It can change the values ​​of various parameters, including the first, second, and third dimension parameters, adjustment distance, rotation angle, and width, and statistically analyze the impact of different parameter changes on the peak-to-peak value, average value, or waveform distortion of the torque fluctuation to determine the torque fluctuation result. Then, a parameter priority sequence is generated based on the torque fluctuation result.

[0290] Subsequently, the parameter set is grouped according to the priority sequence. First, the values ​​of at least some parameters in the high-priority parameter set are adjusted, and then the adjusted parameters are brought into the simulation model to recalculate the torque fluctuation results. When the torque fluctuation results still do not meet the preset conditions, the parameter set of the next priority level is adjusted until the parameter combination that meets the preset requirements is obtained.

[0291] By prioritizing parameters, we can prioritize adjusting the parameters that have the greatest impact on performance, enabling us to quickly improve performance metrics in the first few iterations and avoid wasting time tuning parameters with lower priority, thus significantly accelerating the convergence speed of the entire optimization process.

[0292] Therefore, by adjusting the parameters using the aforementioned priority method, a correspondence can be established between the parameter adjustment order and the torque fluctuation response. This gives the correction of each parameter a clear order and constraint boundary, thus forming the target structural parameters for hierarchical optimization. Furthermore, this makes the torque fluctuation adjustment process more targeted, reduces the number of ineffective adjustments, and makes it easier for the rotor lamination structure of the synchronous reluctance motor to converge to the design result that satisfies operational stability.

[0293] Optionally, the method further includes: after determining the target structural parameters of the rotor lamination structure, adjusting the fillet parameters of the rotor lamination's corner shape to make the corner shape rounded, and obtaining the target structural parameters containing the rounded corner features.

[0294] In this embodiment, the corner shape can refer to the angle or sharp corner profile formed by the intersection of any two planes or curved surfaces on the rotor lamination structure. For example, the corners or ends of a multilayer magnetic barrier.

[0295] Fillet parameters refer to the geometric parameters used to define the size of a fillet, usually referring to the fillet radius. Fillet parameters determine what fraction of a millimeter or millimeter of arc is used to replace the original sharp corner.

[0296] It should be noted that the fillet radius parameter is an empirical value based on mechanical and process design. Its value needs to balance many factors: too small a fillet radius (such as less than the material thickness or the minimum feature size of the mold) may not be able to eliminate stress concentration and protect the mold; too large a fillet radius may accidentally change the local magnetic circuit, slightly affect performance, or occupy unnecessary space.

[0297] Therefore, the fillet parameters can be determined comprehensively based on factors such as material properties, sheet thickness, and manufacturing capabilities in the embodiments of this application.

[0298] Rounded corner features refer to the smooth, rounded corner geometry formed by applying rounded corner parameters to the original sharp corners on the rotor laminations.

[0299] In practice, after obtaining the target structural parameters, the terminal device can read the coordinates of each corner in the rotor lamination outline and then perform rounding correction on the corresponding corners.

[0300] For example, after the terminal device determines the target structural parameters of the rotor lamination structure, it can establish a geometric model of the rotor lamination based on the target structural parameters, then identify the fillet positions of each side and corner in the model, and adjust the corresponding corner points according to the preset fillet constraints.

[0301] The above adjustment process can be completed by parametric modeling software, finite element preprocessing module or rotor lamination die design program, and the output results can be directly used for rotor lamination drawing generation, die processing or subsequent electromagnetic analysis.

[0302] It should be noted that the specific process of rounded corner adjustment in this application embodiment is not limited. During adjustment, the tangential continuity of the boundary where the corner is located can be maintained, so that the corner transition area can be smoothly connected with the adjacent contour. The adjusted rounded corner radius is written into the target structure parameter file or simulation parameter table, thereby forming target structure parameters that include rounded corner features.

[0303] In this way, by performing corner rounding after the target structural parameters are determined, the geometric abrupt changes at the corners of the rotor laminations are weakened, and the local stress concentrations and magnetic flux abrupt changes at the corners are smoothed out. Therefore, the target structural parameters simultaneously include magnetic circuit design parameters and corner rounding geometric parameters. The resulting rotor lamination structure is easier to match with the aforementioned magnetic barrier layout and magnetic bridge dimensions, and ensures that subsequent manufacturing parameters remain consistent with simulation parameters, thereby making the rotor lamination design results more stable.

[0304] For example, Figure 11 This is a flowchart illustrating a method for designing and optimizing rotor laminations for a synchronous reluctance motor, as provided in an embodiment of this application. Figure 11 As shown, the rotor lamination design and optimization method of this synchronous reluctance motor includes the following steps:

[0305] Step A: Preset the rotor outer diameter and the outer magnetic bridge size, that is, determine the first dimension parameters of the rotor laminations and the second dimension parameters of the outer magnetic bridge in the synchronous reluctance motor.

[0306] Step B: Design the number, shape, and size of the magnetoresistive layers, i.e., determine the third dimension parameter of the multi-layered magnetic barrier.

[0307] Step C: Design the intermediate magnetic bridge, that is, determine the width parameters of the target magnetic bridge corresponding to the middle part of the multi-layer magnetic barrier.

[0308] Step D: Design asymmetric magnetic barriers, that is, determine the first magnetic barrier that is closest to the center of the rotor lamination among the multi-layer magnetic barriers, and determine the adjustment distance and rotation angle of the first magnetic barrier.

[0309] Step E: Obtain the target structural parameters for design and optimization, and perform fillet treatment. The target structural parameters are the structural parameters of the rotor lamination structure determined after adjusting at least one of the following parameters: first dimension parameter, second dimension parameter, third dimension parameter, adjustment distance, rotation angle, and width parameter.

[0310] It should be noted that steps A-E correspond to the design process of the rotor lamination, and the specific implementation method can be referred to the description of the above embodiment, which will not be repeated here.

[0311] Step F: Perform parametric simulation on the target structural parameters to obtain the motor torque curve.

[0312] Step G: Evaluate the motor torque curve. The harmonic order and amplitude can be analyzed. If the harmonic order and amplitude are lower than the preset threshold, the parameter simulation ends and the optimized target structural parameters are obtained. If the harmonic order and amplitude are higher than the preset threshold, at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the distance, the rotation angle, and the width parameter is adjusted, and step F is executed again.

[0313] It should be noted that steps F-G correspond to the optimization process of the rotor laminations, and the specific implementation method can be referred to the description of the above embodiments, which will not be repeated here.

[0314] Optionally, this application also provides a synchronous reluctance motor, the synchronous reluctance motor comprising:

[0315] The rotor laminations are designed using the methods described above.

[0316] This synchronous reluctance motor employs rotor laminations designed using the aforementioned method, ensuring a coordinated match between rotor shape parameters, external magnetic bridge parameters, and multi-layer magnetic barrier parameters. Furthermore, the position and rotation angle of the first magnetic barrier closest to the center are specifically adjusted to improve the magnetic circuit distribution in the region near the center and reduce magnetic circuit distortion. Moreover, the compact arrangement of magnetic barriers and magnetic bridge paths within the limited rotor space allows the motor to achieve relatively stable reluctance torque output even under small size and high-speed operation conditions, thereby reducing torque pulsation, vibration, and noise.

[0317] Furthermore, the synchronous reluctance motor manufactured using the design method of this application employs a single iron core structure for its rotor, eliminating the need for expensive rare-earth permanent magnet materials (such as neodymium iron boron). This not only fundamentally eliminates the risk of high-temperature demagnetization of permanent magnets and improves the performance and reliability of the motor, but also significantly reduces the raw material cost of the motor.

[0318] Therefore, this synchronous reluctance motor is more suitable for the limited installation scenarios of cleaning appliances such as robot vacuum cleaners, handheld vacuum cleaners, and electric toothbrushes, while taking into account design efficiency, stable operation and energy efficiency.

[0319] In the foregoing embodiments, the synchronous reluctance motor rotor lamination design method provided in this application has been introduced. To achieve the functions of the methods provided in the embodiments of this application, the electronic device serving as the execution subject may include hardware structures and / or software modules, implementing the above functions in the form of hardware structures, software modules, or a combination of hardware structures and software modules. Whether a particular function is executed in the form of hardware structures, software modules, or a combination of hardware structures and software modules depends on the specific application and design constraints of the technical solution.

[0320] For example, Figure 12 A schematic diagram of a synchronous reluctance motor rotor lamination design device provided in this application embodiment is shown below. Figure 12 As shown, the synchronous reluctance motor rotor lamination design device 1200 includes:

[0321] The first determining module 1201 is used to determine the first dimension parameters of the rotor lamination, the second dimension parameters of the external magnetic bridge, and the third dimension parameters of the multi-layer magnetic barriers in the synchronous reluctance motor, wherein there are magnetic bridge paths between the multi-layer magnetic barriers.

[0322] The second determining module 1202 is used to determine the first magnetic barrier that is closest to the center of the rotor lamination in the multi-layer magnetic barrier, and adjust the position of the first magnetic barrier to determine the adjustment distance and rotation angle of the first magnetic barrier. The adjusted first magnetic barrier does not intersect with other magnetic barriers in the multi-layer magnetic barrier.

[0323] The adjustment module 1203 is used to adjust at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, and the rotation angle to obtain the target structural parameters for determining the rotor lamination structure.

[0324] Optionally, the first determining module 1201 includes a determining unit, which is used for:

[0325] Based on the characteristics of the synchronous reluctance motor, the target number of multi-layer magnetic barriers is determined to be n+1, where n is an integer greater than or equal to 1.

[0326] Based on the direction away from the center of the rotor lamination, it is determined that the radial sides of the second magnetic barrier in the first n layers are concentric arcs, and the radial sides of the first magnetic barrier are non-concentric arcs.

[0327] Determine the concentric circle parameters corresponding to each second magnetic barrier, and the non-concentric circle parameters corresponding to the first magnetic barrier;

[0328] The third dimension parameter of the multi-layer magnetic barrier is determined based on concentric circle parameters and non-concentric circle parameters.

[0329] Optionally, this determining unit is specifically used for:

[0330] Based on concentric circle parameters, construct n layers of the second magnetic barrier, and based on non-concentric circle parameters, construct the first magnetic barrier;

[0331] Based on the dimensional parameters required to construct the n-layer second and first magnetic barriers, the third dimensional parameters of the multi-layer magnetic barriers are determined.

[0332] Optionally, the determining unit includes a first building subunit, which is used for:

[0333] On the outside of the rotor lamination, there are pre-set concentric circle parameters corresponding to n layers of the second magnetic barrier. The concentric circle parameters include the first center, the first radius, and the first width.

[0334] Based on the first center and the first radius, construct the first arc; based on the first center, the first radius, and the sum of the first width, construct the second arc.

[0335] The second magnetic barrier is determined based on the first and second circular arcs, and the first centers of the first n layers of the second magnetic barrier do not coincide; the distance between the first and second circular arcs is equal to the first width.

[0336] Optionally, the determining unit includes a second building subunit, which is used for:

[0337] On the outside of the rotor lamination, the non-concentric circle parameters corresponding to the first magnetic barrier are preset. The non-concentric circle parameters include the second center, the second radius, the second width, and the length parameters.

[0338] Based on the second center and the second radius, construct the third arc; based on the third arc, the second width and length parameters, construct the bottom structure of the first magnetic barrier.

[0339] Determine the positions of the endpoints at both ends of the bottom structure, as well as the angle between the endpoint positions and the partition lines; the partition lines are the dividing lines that divide the rotor laminations into multiple regions, and each region is used to accommodate n+1 layers of magnetic barriers;

[0340] Based on the endpoint positions and included angles, construct the side structure of the first magnetic barrier;

[0341] The first magnetic barrier is determined based on the third circular arc, the bottom structure, and the side structure.

[0342] Optionally, adjustment module 1203 is specifically used for:

[0343] Determine the width parameter of the target magnetic bridge corresponding to the middle part of the multi-layer magnetic barrier, and the length of the target magnetic bridge covers at least a part of the multi-layer magnetic barrier;

[0344] The target structural parameters for determining the rotor lamination structure are obtained by adjusting at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter.

[0345] Optionally, the length of the target magnetic bridge covers all magnetic barriers in the multi-layer magnetic barrier except for the third magnetic barrier, which is the magnetic barrier in the multi-layer magnetic barrier that is farthest from the center of the rotor lamination.

[0346] Optionally, the first magnetic barrier includes a first left magnetic barrier and a first right magnetic barrier, which are distributed on both sides of the target magnetic bridge; the second determining module 1202 includes a first adjusting unit, which is used for:

[0347] Determine the positions of the first left magnetic barrier and the first right magnetic barrier;

[0348] Adjust the position of either the first left magnetic barrier or the first right magnetic barrier to move it, and determine the adjustment distance of the first magnetic barrier;

[0349] Rotate the moved magnetic barrier to determine the rotation angle of the first magnetic barrier.

[0350] Optionally, adjustment module 1203 is specifically used for:

[0351] Parametric simulation analysis was performed on the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter to obtain the torque fluctuation results corresponding to the synchronous reluctance motor.

[0352] If the torque fluctuation result does not meet the preset conditions, adjust at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the distance, the rotation angle, and the width parameter, and re-perform the parametric simulation analysis until the torque fluctuation result obtained from the re-parametric simulation analysis meets the preset conditions.

[0353] The parameters corresponding to the torque fluctuation results meeting the preset conditions are used as the target structural parameters.

[0354] Optionally, the adjustment module 1203 includes a second adjustment unit, which is used for:

[0355] The first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter are prioritized to obtain multiple parameter sets with different priority levels. Each parameter set has a different degree of influence on the torque fluctuation of the synchronous reluctance motor.

[0356] Based on the torque fluctuation results, the values ​​of at least some parameters in each parameter set are adjusted step by step according to priority level.

[0357] Optionally, the synchronous reluctance motor rotor lamination design device 1200 also includes a processing module, which is used for:

[0358] After determining the target structural parameters of the rotor lamination structure, the fillet parameters of the rotor lamination are adjusted to make the corners rounded, thus obtaining the target structural parameters that include the rounded corner features.

[0359] It should be noted that the specific implementation principle and effect of the above-mentioned synchronous reluctance motor rotor lamination design device 1200 can be found in the relevant description and effect of the above embodiments, and will not be elaborated further here.

[0360] This application also provides an electronic device. Figure 13 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application, such as... Figure 13 As shown, the electronic device may include: a processor 1301 and a memory 1302 communicatively connected to the processor 1301; the memory 1302 stores a computer program; the processor 1301 executes the computer program stored in the memory 1302, causing the processor 1301 to perform the method described in any of the above embodiments.

[0361] The memory 1302 and the processor 1301 can be connected via bus 1303.

[0362] This application also provides a computer-readable storage medium storing computer-executable instructions that, when executed by a processor, are used to implement the methods described in any of the foregoing embodiments of this application.

[0363] This application also provides a chip for executing instructions, which is used to perform the methods described in any of the foregoing embodiments executed by an electronic device as described in any of the foregoing embodiments of this application.

[0364] This application also provides a computer program product, which includes a computer program that, when executed by a processor, can implement the methods described in any of the foregoing embodiments executed by an electronic device as described in any of the foregoing embodiments of this application.

[0365] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules 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 apparatuses or modules may be electrical, mechanical, or other forms.

[0366] The modules described as separate components may or may not be physically separate. The components shown as modules 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 modules can be selected to implement the solution of this embodiment according to actual needs.

[0367] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing unit, or each module can exist physically separately, or two or more modules can be integrated into one unit. The unit composed of the above modules can be implemented in hardware or in the form of hardware plus software functional units.

[0368] The integrated modules implemented as software functional modules described above can be stored in a computer-readable storage medium. These software functional modules, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application.

[0369] It should be understood that the aforementioned processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the application can be directly manifested as being executed by a hardware processor, or executed by a combination of hardware and software modules within the processor.

[0370] The memory may include high-speed random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device, and may also be a USB flash drive, external hard drive, read-only memory, disk or optical disc, etc.

[0371] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0372] The aforementioned storage media can be implemented from any type of volatile or non-volatile storage device or a combination thereof, such as Static Random-Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The storage media can be any available medium accessible to general-purpose or special-purpose computers.

[0373] An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Alternatively, the storage medium can be an integral part of the processor. Both the processor and the storage medium can reside in application-specific integrated circuits (ASICs). Alternatively, the processor and storage medium can exist as discrete components in an electronic device or host device.

[0374] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0375] It should be further noted that although the steps in the flowchart are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowchart may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0376] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0377] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0378] The above are merely specific implementations of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of this application should be covered within the protection scope of the embodiments of this application.

Claims

1. A method for designing rotor laminations for a synchronous reluctance motor, characterized in that, The method includes: The first dimension parameters of the rotor laminations, the second dimension parameters of the external magnetic bridge, and the third dimension parameters of the multi-layer magnetic barriers in the synchronous reluctance motor are determined, wherein there are magnetic bridge paths between the multi-layer magnetic barriers; The first magnetic barrier, which is closest to the center of the rotor lamination among the multi-layered magnetic barriers, is identified, and its position is adjusted to determine the adjustment distance and rotation angle of the first magnetic barrier. The adjusted first magnetic barrier does not intersect with the other magnetic barriers in the multi-layered magnetic barriers. The target structural parameters for determining the rotor lamination structure are obtained by adjusting at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, and the rotation angle.

2. The method according to claim 1, characterized in that, The process of determining the third dimension parameter of the multi-layered magnetic barrier includes: Based on the motor characteristics of the synchronous reluctance motor, the target number of the multi-layer magnetic barrier is determined to be n+1, where n is an integer greater than or equal to 1. Based on the direction away from the center of the rotor lamination, it is determined that the radial sides of the second magnetic barrier in the first n layers are concentric arcs, and the radial sides of the first magnetic barrier are non-concentric arcs. Determine the concentric circle parameters corresponding to each second magnetic barrier, and the non-concentric circle parameters corresponding to the first magnetic barrier; Based on the concentric circle parameters and the non-concentric circle parameters, the third dimension parameter of the multi-layer magnetic barrier is determined.

3. The method according to claim 2, characterized in that, The determination of the third dimension parameter of the multi-layer magnetic barrier based on the concentric circle parameter and the non-concentric circle parameter includes: Based on the concentric circle parameters, n layers of the second magnetic barrier are constructed, and based on the non-concentric circle parameters, the first magnetic barrier is constructed. Based on the size parameters required to construct n layers of the second magnetic barrier and the first magnetic barrier, the third size parameter of the multi-layer magnetic barrier is determined.

4. The method according to claim 3, characterized in that, The construction of n layers of the second magnetic barrier based on the concentric circle parameters includes: On the outer side of the rotor lamination, there are pre-defined concentric circle parameters corresponding to n layers of second magnetic barriers. The concentric circle parameters include a first center, a first radius, and a first width. Based on the first center and the first radius, construct a first arc; based on the first center, the first radius, and the sum of the first width, construct a second arc. The second magnetic barrier is determined based on the first arc and the second arc, and the first centers of the first n layers of the second magnetic barrier do not coincide; the distance between the first arc and the second arc is equal to the first width.

5. The method according to claim 3, characterized in that, The construction of the first magnetic barrier based on the non-concentric circle parameters includes: On the outer side of the rotor lamination, a non-concentric circle parameter corresponding to the first magnetic barrier is preset, the non-concentric circle parameter including a second center, a second radius, a second width, and a length parameter; Based on the second center and the second radius, a third arc is constructed, and based on the third arc, the second width and length parameters are used to construct the bottom structure of the first magnetic barrier; Determine the endpoint positions at both ends of the bottom structure, and the angle between the endpoint positions and the partition line; the partition line is the dividing line that divides the rotor lamination into multiple regions, and each region is used to accommodate n+1 layers of magnetic barriers; Based on the endpoint positions and the included angle, the side structure of the first magnetic barrier is constructed; The first magnetic barrier is determined based on the third arc, the bottom structure, and the side structure.

6. The method according to claim 1, characterized in that, The step of adjusting at least one of the first dimensional parameter, the second dimensional parameter, the third dimensional parameter, the adjustment distance, and the rotation angle to obtain the target structural parameters for determining the rotor lamination structure includes: Determine the width parameter of the target magnetic bridge corresponding to the middle portion of the multi-layered magnetic barrier, wherein the length of the target magnetic bridge covers at least a portion of the multi-layered magnetic barrier; The target structural parameters for determining the rotor lamination structure are obtained by adjusting at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter.

7. The method according to claim 6, characterized in that, The length of the target magnetic bridge covers all magnetic barriers in the multi-layered magnetic barriers except for the third magnetic barrier, which is the magnetic barrier in the multi-layered magnetic barriers that is farthest from the center of the rotor lamination.

8. The method according to claim 6, characterized in that, The first magnetic barrier includes a first left magnetic barrier and a first right magnetic barrier, which are distributed on both sides of the target magnetic bridge; adjusting the position of the first magnetic barrier to determine the adjustment distance and rotation angle of the first magnetic barrier includes: Determine the positions of the first left magnetic barrier and the first right magnetic barrier; The position of either the first left magnetic barrier or the first right magnetic barrier is adjusted and moved to determine the adjustment distance of the first magnetic barrier; The moved magnetic barrier is rotated to determine the rotation angle of the first magnetic barrier.

9. The method according to claim 6, characterized in that, The step of adjusting at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter to obtain the target structural parameters for determining the rotor lamination structure includes: Parametric simulation analysis is performed on the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter to obtain the torque fluctuation results corresponding to the synchronous reluctance motor. If the torque fluctuation result does not meet the preset conditions, adjust at least one of the first size parameter, the second size parameter, the third size parameter, the adjustment distance, the rotation angle, and the width parameter, and re-perform the parametric simulation analysis until the torque fluctuation result obtained from the re-parametric simulation analysis meets the preset conditions. The parameters corresponding to the torque fluctuation results satisfying the preset conditions are used as the target structural parameters.

10. The method according to claim 9, characterized in that, Adjusting at least one of the first size parameter, the second size parameter, the third size parameter, the adjustment distance, the rotation angle, and the width parameter includes: The first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, the rotation angle, and the width parameter are prioritized to obtain multiple parameter sets with different priority levels, wherein each parameter set has a different degree of influence on the torque fluctuation of the synchronous reluctance motor; Based on the torque fluctuation results, the values ​​of at least some parameters in each parameter set are adjusted step by step according to the priority level.

11. The method according to claim 1, characterized in that, The method further includes: After determining the target structural parameters of the rotor lamination structure, the fillet parameters of the rotor lamination are adjusted so that the corner shape is rounded, and the target structural parameters containing rounded corner features are obtained.

12. A rotor lamination for a synchronous reluctance motor, characterized in that, The rotor lamination has multiple regions, and each region has n+1 layers of magnetic barriers; In the second magnetic barrier corresponding to the first n layers, the radial outer side of each second magnetic barrier is a concentric circular arc, the radial outer side of the first magnetic barrier corresponding to the n+1th layer is a circular arc, and the radial inner side and the two circumferential sides of the first magnetic barrier are straight lines. The structure of the rotor lamination is determined by the method described in any one of claims 1-11.

13. The rotor lamination according to claim 12, characterized in that, The first magnetic barrier includes an asymmetric magnetic barrier, which is a structure formed by translating and rotating a reference magnetic barrier.

14. A design device for rotor laminations of a synchronous reluctance motor, characterized in that, The device includes: The first determining module is used to determine the first dimension parameters of the rotor laminations, the second dimension parameters of the external magnetic bridge, and the third dimension parameters of the multi-layer magnetic barriers in the synchronous reluctance motor, wherein the multi-layer magnetic barriers have magnetic bridge paths between them. The second determining module is used to determine the first magnetic barrier that is closest to the center of the rotor lamination among the multi-layer magnetic barriers, and adjust the position of the first magnetic barrier to determine the adjustment distance and rotation angle of the first magnetic barrier. The adjusted first magnetic barrier does not intersect with other magnetic barriers in the multi-layer magnetic barriers. The adjustment module is used to adjust at least one of the first dimension parameter, the second dimension parameter, the third dimension parameter, the adjustment distance, and the rotation angle to obtain the target structural parameters for determining the rotor lamination structure.

15. A synchronous reluctance motor, characterized in that, include: Rotor laminations designed by the method according to any one of claims 1-11.

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