Rotor topology structure

Abstract

The invention relates to the technical field of permanent magnet motors, in particular to a rotor topological structure. The permanent magnet mounting groove group comprises a first permanent magnet mounting groove and a second permanent magnet mounting groove which are symmetrically arranged about the d axis, and the permanent magnet group comprises a first permanent magnet arranged in the first permanent magnet mounting groove and a second permanent magnet arranged in the second permanent magnet mounting groove; an air slot group is arranged between any two adjacent permanent magnet mounting slot groups in the radial direction of the rotating shaft, the air slot group comprises a first air slot and a second air slot which are symmetrically arranged about the d axis, and the first air slot is communicated between the first permanent magnet mounting slots of the two adjacent magnet mounting slot groups; and the second air grooves are communicated between the second permanent magnet mounting grooves of the two adjacent magnet mounting groove groups. The rotor topological structure is provided with the first air slots and the second air slots, so that the permanent magnets and the air slots intersect with each other, the number of slots in the rotor is reduced, the complexity in the industrial manufacturing process is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motor technology, and in particular to a rotor topology. Background Technology

[0002] Due to its advantages such as high power density, high efficiency and high torque density, permanent magnet synchronous motors have been widely used in aerospace, new energy power generation and electric vehicles.

[0003] With the rapid development of the electric vehicle industry, built-in permanent magnet synchronous motors (PMSMs) have gained increasing favor among automakers and are widely used as drive motors in electric vehicles due to their excellent driving and speed regulation performance. However, with the deepening application of PMSMs in new energy vehicles, the single-layer permanent magnet structure is no longer sufficient to meet motor designers' pursuit of higher performance. Therefore, a double-layer permanent magnet rotor topology has been proposed. Compared with the single-layer structure, the double-layer permanent magnet structure can provide higher torque output performance while reducing torque ripple, further improving its operating efficiency and service life, and effectively enhancing the stability and reliability of the motor system.

[0004] However, the traditional double-layer rotor core has a large number of slots, a complex structure, and is difficult to process, which reduces production efficiency.

[0005] Therefore, a rotor topology is urgently needed to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to propose a rotor topology that can reduce processing difficulty, simplify rotor structure, and improve production efficiency.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A rotor topology includes a rotor shaft and a rotor body sleeved on the shaft. The rotor body includes multiple magnetic pole units uniformly distributed along the circumferential direction of the shaft. Any two adjacent magnetic pole units are symmetrically arranged about the q-axis. Each magnetic pole unit includes a first air slot group and multiple magnetic pole structures, which are radially spaced along the shaft. Each magnetic pole structure includes a permanent magnet mounting slot group and a permanent magnet group. The permanent magnet mounting slot group includes a first permanent magnet mounting slot and a second permanent magnet mounting slot symmetrically arranged about the d-axis. The permanent magnet assembly includes a first permanent magnet disposed in the first permanent magnet mounting slot and a second permanent magnet disposed in the second permanent magnet mounting slot. A first air slot assembly is disposed between any two adjacent permanent magnet mounting slot assemblies along the radial direction of the rotation axis. The first air slot assembly includes a first air slot and a second air slot symmetrically arranged about the d-axis. The first air slot is connected between the first permanent magnet mounting slots of two adjacent permanent magnet mounting slot assemblies, and the second air slot is connected between the second permanent magnet mounting slots of two adjacent permanent magnet mounting slot assemblies.

[0009] As a preferred embodiment of the above rotor topology, the magnetic pole unit further includes a second air slot group, which includes a third air slot and a fourth air slot symmetrically arranged about the d-axis. The first permanent magnet mounting slot farthest from the center of the rotating shaft among the plurality of first permanent magnet mounting slots is connected to the third air slot; the second permanent magnet mounting slot farthest from the center of the rotating shaft among the plurality of second permanent magnet mounting slots is connected to the fourth air slot.

[0010] As a preferred embodiment of the above rotor topology, the walls of the third air slot and the fourth air slot are both arc-shaped, and the walls of the third air slot and the fourth air slot are both internally tangentially fitted to the outer circumferential surface of the rotor body.

[0011] As a preferred embodiment of the above rotor topology, the walls of the third air slot and the fourth air slot both extend through the outer diameter of the rotor body to form an opening.

[0012] As a preferred embodiment of the above rotor topology, the first permanent magnet and the second permanent magnet of the permanent magnet assembly are arranged in a V-shape.

[0013] As a preferred technical solution of the above rotor topology, the two first permanent magnets and the two second permanent magnets form a V-shaped structure with an included angle of α, wherein 90°≤α≤180°.

[0014] As a preferred embodiment of the above rotor topology, the rotor body includes six magnetic pole units, each magnetic pole unit being arc-shaped with a central angle of 60°.

[0015] As a preferred technical solution for the above rotor topology, the thickness of the magnetic rib between the first permanent magnet and the second permanent magnet, which are symmetrical about the d-axis, is not less than the thickness of the air gap.

[0016] As a preferred embodiment of the aforementioned rotor topology, the sum of the cross-sectional areas of the first permanent magnet and the second permanent magnet is S, where 236.6m² 2 ≤S≤301.6m 2 .

[0017] As a preferred technical solution for the above rotor topology, the rotor body is formed by stacking multiple silicon steel sheets.

[0018] Beneficial effects of this invention:

[0019] This invention provides a rotor topology. The rotor includes a shaft and a rotor body sleeved on the shaft. The rotor body includes multiple magnetic pole units, which are uniformly distributed along the circumference of the shaft. Any two adjacent magnetic pole units are symmetrically arranged about the q-axis. Each magnetic pole unit includes a first air slot group and multiple magnetic pole structures, which are radially spaced along the shaft. Each magnetic pole structure includes a permanent magnet mounting slot group and a permanent magnet group. The permanent magnet mounting slot group includes a first permanent magnet mounting slot and a second permanent magnet mounting slot symmetrically arranged about the d-axis. The permanent magnet group includes a first permanent magnet disposed in the first permanent magnet mounting slot and a second permanent magnet disposed in the second permanent magnet mounting slot. An air slot group is provided between any two adjacent permanent magnet mounting slot groups along the radial direction of the shaft. Each air slot group includes a first air slot and a second air slot symmetrically arranged about the d-axis. The first air slot connects to the first permanent magnet mounting slots of two adjacent magnetic mounting slot groups, and the second air slot connects to the second permanent magnet mounting slots of two adjacent magnetic mounting slot groups. Compared to existing technologies, this rotor topology achieves the intersection of permanent magnets and air slots by setting a first air slot and a second air slot, reducing the number of slots on the rotor, reducing the complexity of the industrial manufacturing process, and improving production efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the rotor pole structure provided in an embodiment of the present invention;

[0022] Figure 2 This is a magnetic field strength cloud map provided in an embodiment of the present invention;

[0023] Figure 3 This is a magnetic field strength cloud map provided in a prior art embodiment;

[0024] Figure 4 This is a comparison chart of the output torque performance of the embodiments of the present invention and the prior art.

[0025] In the picture:

[0026] 1. Rotating shaft; 2. Magnetic pole unit; 3. First permanent magnet; 4. Second permanent magnet; 5. First air slot; 6. Second air slot; 7. Third air slot; 8. Fourth air slot. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0028] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0031] like Figure 1 As shown, the present invention provides a rotor topology. The rotor includes a shaft 1 and a rotor body sleeved on the shaft 1. The rotor body includes multiple magnetic pole units 2, which are evenly distributed along the circumference of the shaft 1. Any two adjacent magnetic pole units 2 are symmetrically arranged about the q-axis. Each magnetic pole unit 2 includes a first air slot group and multiple magnetic pole structures, which are spaced apart radially along the shaft 1. Each magnetic pole structure includes a permanent magnet mounting slot group and a permanent magnet group. The permanent magnet mounting slot group includes a first permanent magnet mounting slot and a second permanent magnet mounting slot symmetrically arranged about the d-axis. The permanent magnet group includes a first permanent magnet 3 disposed in the first permanent magnet mounting slot and a second permanent magnet 4 disposed in the second permanent magnet mounting slot. A first air slot group is provided between any two adjacent permanent magnet mounting slot groups radially along the shaft 1. The first air slot group includes a first air slot 5 and a second air slot 6 symmetrically arranged about the d-axis. The first air slot 5 connects to the first permanent magnet mounting slots of two adjacent magnetic mounting slot groups, and the second air slot 6 connects to the second permanent magnet mounting slots of two adjacent magnetic mounting slot groups. Compared to existing technologies, this rotor topology, by setting a first air slot 5 and a second air slot 6, enables the permanent magnets and air slots to intersect, reducing the number of slots on the rotor, lowering the complexity of the industrial manufacturing process, and improving production efficiency. At the same time, compared with segmented magnet structures, the permanent magnets in this rotor topology are connected by air slots, eliminating the need for high-temperature adhesive bonding to form an insulating layer, reducing the requirements for process precision, lowering manufacturing costs, avoiding the material loss that would be increased during segmented cutting, and reducing assembly difficulty in the assembly process.

[0032] Optionally, the magnetic pole unit 2 further includes a second air slot group, which includes a third air slot 7 and a fourth air slot 8 symmetrically arranged about the d-axis. The first permanent magnet mounting slot furthest from the center of the rotating shaft 1 among the plurality of first permanent magnet mounting slots is connected to the third air slot 7; the second permanent magnet mounting slot furthest from the center of the rotating shaft 1 among the plurality of second permanent magnet mounting slots is connected to the fourth air slot 8. Further, the walls of both the third air slot 7 and the fourth air slot 8 are arc-shaped, and both are internally tangentially fitted to the outer circumferential surface of the rotor body. Specifically, the walls of both the third air slot 7 and the fourth air slot 8 penetrate the outer diameter of the rotor body to form openings. The structural design of the permanent magnets and air slots inside the rotor improves the magnetic circuit, reduces permanent magnet leakage, and increases the utilization rate of the permanent magnets.

[0033] Optionally, the rotor body is formed by stacking multiple silicon steel sheets. Specifically, the rotor body is formed by stacking multiple silicon steel sheets, and the magnetic pole unit 2 has several air slots inside. The air slots and permanent magnets are symmetrically distributed about the d-axis on the magnetic pole unit 2. By adopting this technical solution, the internal topology of the rotor is made symmetrical about the d-axis, which improves the stability of the rotor during operation, ensures the stability of the magnetic field, and enables a more stable output during application.

[0034] Furthermore, in this embodiment, the rotor body includes six magnetic pole units 2, which are arc-shaped and have a central angle of 60°. Of course, in other embodiments, the number of magnetic pole units 2 is determined according to the actual situation, which will not be elaborated here.

[0035] Optionally, the first permanent magnet 3 and the second permanent magnet 4 of the permanent magnet assembly are arranged in a V-shape. Specifically, compared with the traditional double-layer V-shaped structure, this design breaks away from the inherent structure of the traditional double-layer V-shaped structure where the magnets are arranged in parallel with a consistent angle. The first permanent magnet 3 is no longer connected to air slots at both ends; instead, only one end of the first permanent magnet 3 is connected to the first air slot 5. This makes it easier to manufacture and assemble compared to the traditional double-layer structure. Of course, in other embodiments, this rotor topology is not only applicable to V-shaped structures but also to double-layer straight-line, double-layer U-shaped, and hybrid V-shaped structures. Further, in this embodiment, the two first permanent magnets 3 and the two second permanent magnets 4 form a V-shaped structure with an included angle of α, where 90°≤α≤180°.

[0036] Optionally, the thickness of the magnetic rib between the first permanent magnet 3 and the second permanent magnet 4, which are symmetrical about the d-axis, is not less than the air gap thickness. This arrangement ensures that the designed thickness between the first permanent magnet 3 and the second permanent magnet 4 is not less than the air gap thickness. This design provides stable structural support for the rotor, ensuring that its mechanical strength meets operational requirements.

[0037] Optionally, the sum of the cross-sectional areas of the first permanent magnet 3 and the second permanent magnet 4 is S, where 236.6m 2 ≤S≤301.6m 2 With this configuration, the sum of the cross-sectional areas of the first permanent magnet 3 and the second permanent magnet 4 does not exceed the constraint condition, ensuring that the motor output performance is increased without increasing the amount of permanent magnet material or raising manufacturing costs.

[0038] The rotor topology provided by this invention improves motor performance compared to existing technologies. Existing technology models employ a 6-pole, 54-slot structure. All simulations were conducted under a uniform operating condition of 90A peak current and 1000rpm. The magnetic field strength contour maps of the embodiments and reference models provided by this invention are shown below. Figure 2 and Figure 3 As shown; the output torque performance of the embodiments and reference models provided by the present invention is compared to, for example... Figure 4 As shown, the red curve represents the output torque image of the embodiment provided by the present invention, and the blue curve represents the output torque image of the reference model. Compared with the reference model, the maximum torque of the rotor topology provided by the present invention is increased by 16.47%, and the torque fluctuation is reduced by 16.37%. Therefore, the rotor topology provided by the present invention can effectively improve the motor performance under the same operating conditions.

[0039] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A rotor topology, characterized in that The rotor comprises a rotating shaft (1) and a rotor body sleeved on the rotating shaft (1), the rotor body comprises a plurality of magnetic pole units (2), the plurality of magnetic pole units (2) are uniformly distributed along the circumferential direction of the rotating shaft (1), any two adjacent magnetic pole units (2) are symmetrically arranged about a q-axis, the magnetic pole unit (2) comprises a first air slot group and a plurality of magnetic pole structures, the plurality of magnetic pole structures are arranged at intervals along the radial direction of the rotating shaft (1), the magnetic pole structure comprises a permanent magnet mounting slot group and a permanent magnet group, the permanent magnet mounting slot group comprises a first permanent magnet mounting slot and a second permanent magnet mounting slot which are symmetrically arranged about a d-axis, the permanent magnet group comprises a first permanent magnet (3) arranged in the first permanent magnet mounting slot and a second permanent magnet (4) arranged in the second permanent magnet mounting slot, one first air slot group is arranged between any two adjacent permanent magnet mounting slot groups along the radial direction of the rotating shaft (1), the first air slot group comprises a first air slot (5) and a second air slot (6) which are symmetrically arranged about the d-axis, the first air slot (5) is communicated between the first permanent magnet mounting slots of the two adjacent permanent magnet mounting slot groups, and the second air slot (6) is communicated between the second permanent magnet mounting slots of the two adjacent permanent magnet mounting slot groups.

2. The rotor topology of claim 1, wherein, The magnetic pole unit (2) further comprises a second air slot group, the second air slot group comprises a third air slot (7) and a fourth air slot (8) which are symmetrically arranged about the d-axis, one of the first permanent magnet mounting slots farthest from the center of the rotating shaft (1) is communicated with the third air slot (7), and one of the second permanent magnet mounting slots farthest from the center of the rotating shaft (1) is communicated with the fourth air slot (8).

3. The rotor topology of claim 2, wherein, The slot wall of the third air slot (7) and the slot wall of the fourth air slot (8) are both arc-shaped, and the slot wall of the third air slot (7) and the slot wall of the fourth air slot (8) are both inscribedly matched with the outer circumferential surface of the rotor body.

4. The rotor topology of claim 3, wherein, The slot wall of the third air slot (7) and the slot wall of the fourth air slot (8) both form openings through the outer diameter of the rotor body.

5. The rotor topology of claim 1, wherein, The first permanent magnet (3) and the second permanent magnet (4) of the permanent magnet group are arranged in a V shape.

6. The rotor topology of claim 5, wherein, Two first permanent magnets (3) and two second permanent magnets (4) form a V-shaped structure, and the included angle is α, wherein 90°≤α≤180°.

7. The rotor topology of any of claims 1-5, wherein, The rotor body comprises six magnetic pole units (2), the magnetic pole units (2) are arc-shaped, and the central angle of the magnetic pole units (2) is 60°.

8. The rotor topology of any of claims 1-5, wherein, The magnetic rib thickness between the first permanent magnet (3) and the second permanent magnet (4) which are symmetric about the d-axis is not less than the air gap thickness.

9. The rotor topology of any of claims 1-5, wherein, The sum of the cross-sectional areas of the first permanent magnet (3) and the second permanent magnet (4) is S, wherein 236.6m 2 ≤ S ≤ 301.6m 2 .

10. The rotor topology of any of claims 1-5, wherein, The rotor body is formed by laminating a plurality of silicon steel sheets.

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