Rotor structure and motor
By setting a tangent structure on the surface of the N-pole rare earth magnetic pole of the motor rotor structure and increasing the air gap length, the problems of stress over limit and torque fluctuations in traditional motors at high speeds are solved, and peak torque improvement and NVH performance are achieved Improvement.
Patent Information
- Application Number
- CN202411159681.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-01-03
AI Technical Summary
The rotor stress of the traditional multi-layer magnetic barrier synchronous reluctance motor exceeds the limit strength of the silicon steel sheet at high speed, and the torque fluctuates greatly, resulting in poor NVH performance. After setting the reinforcement rib, the peak torque is low and the torque fluctuates greatly. , it is difficult to effectively improve the motor performance.
Design a rotor structure, including rotor core, reinforcement rib and edge cutting structure, by setting an eccentric elliptical arc surface, an eccentric arc surface or a cutting edge cutting structure on the surface of the N-pole rare earth magnetic pole, an eccentric arc surface or a cutting edge cutting structure, increase the d-axis air gap length , adjust the magnetic field distribution, increase the peak torque and reduce torque fluctuations.
Effectively improve the peak torque of the motor, reduce torque fluctuations, and significantly improve NVH performance. Simulation data shows that the peak torque is increased by 1.1%, torque fluctuation is reduced by 25%, cogging torque is reduced by 18%, POT operating condition level The sub-torque is significantly reduced.
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Figure CN119253892A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of motor equipment, and in particular to a rotor structure and a motor. Background Art
[0002] The traditional multi-layer magnetic barrier synchronous reluctance motor adopts a multi-layer magnetic barrier design to increase the reluctance torque to compensate for the reduction of permanent magnet torque due to the reduction of rare earth usage. However, the rotor stress of the motor exceeds the ultimate strength of the silicon steel sheet at high speed, and the torque fluctuation is large, resulting in poor NVH (noise, vibration and roughness) performance. Currently, the maximum stress of the rotor structure is reduced by setting reinforcing ribs on this rotor structure. Under the same simulation conditions, the maximum stress of the rotor is effectively reduced.
[0003] However, since the setting of the reinforcement ribs will cause a certain amount of magnetic leakage in the rotor structure, the peak torque of the motor is lower than that of the traditional solution, and there is still a problem of high torque fluctuation, resulting in poor NVH performance of the motor.
[0004] Therefore, providing a rotor structure and motor that can increase the peak torque of the rotor, reduce torque fluctuations, and improve the NVH performance of the motor on the basis of setting reinforcing ribs has become a technical problem that urgently needs to be solved in this field. Summary of the Invention
[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a rotor structure and a motor to solve the problems of low peak torque, large torque fluctuation and poor NVH performance of the rotor structure with reinforcing ribs.
[0006] The above technical objectives of the present invention are achieved through the following technical solutions:
[0007] A rotor structure includes a rotor core, reinforcing ribs, and a trimming structure; a plurality of magnetic poles are arranged circumferentially around the rotor core, the plurality of magnetic poles including an N-pole rare earth magnetic pole and an S-pole rare earth magnetic pole spaced apart from each other, each magnetic pole having a plurality of layers of permanent magnet units arranged symmetrically about the d-axis; the reinforcing ribs are arranged between the symmetrical permanent magnet units; the trimming structure comprises an outer surface of the N-pole rare earth magnetic pole having a trimming structure corresponding to the permanent magnet units, the trimming structure being an eccentric elliptical arc surface, an eccentric circular arc surface, or a cut straight line segment connected to the outer surface of the S-pole rare earth magnetic pole.
[0008] Furthermore, the distance between the center of the ellipse forming the eccentric elliptical arc surface and the outer circle center of the rotor core is D1, the radius of the major axis of the ellipse is X, and the radius of the minor axis of the ellipse is Y, wherein 44mm≤D1≤45mm, 34.5mm≤X≤35.5mm, and 15.5mm≤Y≤16mm.
[0009] Furthermore, the distance between the center of the eccentric circle forming the eccentric arc surface and the center of the outer circle of the rotor core is D2, and the radius of the eccentric circle is R, wherein 11.5 mm ≤ D2 ≤ 12.5 mm, and 72.5 mm ≤ R ≤ 73 mm.
[0010] Furthermore, the distance between the cut straight line segment and the center of the outer circle of the rotor core is D3, wherein 60 mm ≤ D3 ≤ 60.8 mm.
[0011] Furthermore, the cutting straight line segment is arranged perpendicular to the d-axis.
[0012] Furthermore, the multi-layer permanent magnet units are arranged at intervals along the radial direction of the rotor core. The permanent magnet units include permanent magnet slots and permanent magnets arranged in the permanent magnet slots. The permanent magnets are arc-shaped.
[0013] Furthermore, a magnetic barrier is provided on the rotor core, and the magnetic barrier is provided on one side of the permanent magnet slot.
[0014] Furthermore, the distances between the plurality of permanent magnets and the d-axis gradually increase in a direction approaching the rotation center of the rotor core.
[0015] Furthermore, each magnetic pole is provided with a weight-reducing hole, the weight-reducing holes are symmetrically arranged about the d-axis, and the weight-reducing holes are arranged at intervals in the circumferential direction of the rotor core.
[0016] Furthermore, a motor includes a stator structure and a rotor structure. The rotor structure is rotatably disposed in the stator structure, and an air gap is formed between the rotor structure and the stator structure.
[0017] The beneficial effects of the embodiments of the present invention are:
[0018] First, the present application provides a rotor structure, which reduces the thickness of the N-pole rare earth pole by setting a cutting edge structure on the outer surface of the N-pole rare earth pole of the rotor structure, thereby increasing the d-axis air gap length and the magnetic field strength of the N-pole rare earth pole, thereby increasing the peak torque of the rotor structure, reducing torque fluctuations, and improving the NVH performance of the motor.
[0019] In one embodiment, the cutting edge structure in the present application may be an eccentric elliptical arc surface, an eccentric circular arc surface, or a cutting straight line segment. By adjusting the appropriate distance between the eccentric ellipse, the eccentric circle, the cutting straight line and the outer circle center of the rotor core, the air gap is increased to an appropriate length so that the air gap is neither too long nor too short, thereby improving the air gap magnetic field and further increasing the peak torque. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application.
[0021] Figure 1A cross-sectional view of a rotor structure according to an embodiment of the present application;
[0022] Figure 2 This is a schematic structural diagram of the reinforcing ribs of the rotor structure shown in one embodiment of the present application;
[0023] Figure 3 A schematic structural diagram of an N-pole rare earth magnetic pole and an S-pole rare earth magnetic pole of a rotor structure shown in one embodiment of the present application;
[0024] Figure 4 This is a schematic structural diagram of an eccentric elliptical cut N-pole rare earth magnetic pole of a rotor structure shown in one embodiment of the present application;
[0025] Figure 5 A schematic structural diagram of an N-pole rare earth magnetic pole of a rotor structure shown in one embodiment of the present application;
[0026] Figure 6 This is a peak torque comparison diagram of a rotor structure shown in an embodiment of the present application;
[0027] Figure 7 This is a cogging torque comparison diagram of a rotor structure shown in an embodiment of the present application;
[0028] Figure 8 This is a POT torque harmonic comparison diagram of a rotor structure shown in an embodiment of the present application;
[0029] Figure 9 This is a schematic structural diagram of an N-pole rare earth magnetic pole and an S-pole rare earth magnetic pole of a rotor structure shown in another embodiment of the present application;
[0030] Figure 10 This is a schematic structural diagram of an eccentrically cut N-pole rare earth magnetic pole of a rotor structure shown in another embodiment of the present application;
[0031] Figure 11 This is a schematic structural diagram of an N-pole rare earth magnetic pole of a rotor structure shown in another embodiment of the present application;
[0032] Figure 12 A cross-sectional view of a rotor core of a rotor structure according to another embodiment of the present application;
[0033] Figure 13 This is a schematic structural diagram of an N-pole rare earth magnetic pole and an S-pole rare earth magnetic pole of a rotor structure shown in other embodiments of the present application;
[0034] Figure 14 This is a schematic structural diagram of a rotor structure shown in other embodiments of the present application, in which a straight line cuts an N-pole rare earth magnetic pole;
[0035] Figure 15 This is a schematic structural diagram of the N-pole rare earth magnetic pole of the rotor structure shown in other embodiments of the present application;
[0036] Figure 16 A cross-sectional view of a rotor core of a rotor structure shown in another embodiment of the present application;
[0037] Figure 17 This is a structural diagram of a permanent magnet unit of a rotor structure according to an embodiment of the present application;
[0038] Figure 18 Schematic diagram of the magnetization direction of the arc-shaped permanent magnet.
[0039] Figure numerals: 1. rotor core; 11. magnetic pole; 12. N-pole rare earth pole; 13. S-pole rare earth pole; 14. permanent magnet unit; 141. permanent magnet slot; 142. permanent magnet; 143. first permanent magnet unit; 144. second permanent magnet unit; 15. rotor outer arc surface; 16. outer circle of rotor core; 2. reinforcing rib; 3. cutting edge structure; 31. eccentric elliptical arc surface; 32. eccentric circular arc surface; 33. cutting straight line segment; 4. eccentric ellipse; 5. eccentric circle; 6. cutting straight line; 7. magnetic barrier; 8. weight reduction hole. DETAILED DESCRIPTION
[0040] In the description of this application, it should be noted that the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.
[0041] The present invention aims to provide a rotor structure to solve the problems of low peak torque, large torque fluctuation and poor NVH performance of the motor in rotor structures with reinforcement ribs. The present invention also provides a motor.
[0042] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.
[0043] See also Figure 1 -2, a rotor structure, including a rotor core 1, reinforcement ribs 2 and a trimming structure 3.
[0044] The rotor core 1 is circumferentially provided with a plurality of magnetic poles 11, the plurality of magnetic poles 11 including an N-pole rare earth magnetic pole 12 and an S-pole rare earth magnetic pole 13 spaced apart from each other. An asymmetric magnetic pole structure is formed on the rotor core 1, in which the N-pole rare earth magnetic pole 12 and the S-pole rare earth magnetic pole 13 are spaced apart from each other.
[0045] A multi-layer permanent magnet unit 14 is provided in each magnetic pole 11 , and the multi-layer permanent magnet unit 14 is symmetrically distributed about the d-axis. The permanent magnet unit 14 includes a first permanent magnet unit and a second permanent magnet unit that are symmetrically distributed.
[0046] Among them, for the rotor structure, the d-axis refers to the magnetic field axis of the rotor structure's magnetic poles. Symmetry about the d-axis means that the first permanent magnet unit and the second permanent magnet unit of the multi-layer permanent magnet unit 14 are symmetrical about the axis of the symmetry center line of the magnetic pole 11 in which they are located, which is used to enhance the magnetic field strength and improve the efficiency of the rotor structure operation.
[0047] A reinforcing rib 2 is provided on the rotor structure. The reinforcing rib 2 is provided between the symmetrical first permanent magnet unit and the second permanent magnet unit to reduce the maximum stress of the rotor structure.
[0048] In order to increase the peak torque of the rotor structure and reduce torque fluctuation, the above-mentioned rotor structure adopts an asymmetric magnetic pole 11 design. By setting a cutting edge structure 3, the surface of the N-pole rare earth magnetic pole 12 is eccentrically cut and modified to increase the d-axis air gap length, while the surface of the S-pole rare earth magnetic pole 13 remains unchanged.
[0049] The outer surface of the N rare earth magnetic pole 12 has a cutting structure 3 corresponding to the permanent magnet unit 14 . The cutting structure 3 is an eccentric elliptical arc surface 31 , an eccentric circular arc surface 32 or a cutting straight line segment 33 connected to the outer surface of the S rare earth magnetic pole 13 .
[0050] Specifically, the present invention cuts the outer surface of the N-pole rare earth magnetic pole 12 through a cutting structure, so that the outer surface of the N-pole rare earth magnetic pole 12 is divided into the cutting edge structure 3 and the rotor outer arc surface 15 .
[0051] By cutting the outer surface of the rotor core 1, the thickness of the N-pole rare earth pole 12 can be reduced, the d-axis air gap length can be increased, the air gap magnetic density can be adjusted, the air gap magnetic field waveform can be improved, the radial magnetic force of the motor can be reduced, and the utilization rate of the permanent magnet unit 14 of the motor can be improved. The d-axis weak magnetic reverse field entering the permanent magnet unit 14 under the same stator structure current conditions in the motor can be lowered, thereby enhancing the anti-demagnetization performance of the permanent magnet unit 14 and ensuring the stable operation and long service life of the motor.
[0052] At the same time, it can reduce the torque fluctuation caused by the salient pole effect of the motor, reduce the torque fluctuation of the slot torque when the motor is loaded in the entire area, and improve the NVH performance of the motor.
[0053] The above-mentioned d-axis air gap length is adjusted according to the actual motor and rotor structure.
[0054] See also Figure 3-8. In one embodiment, the cutting structure is an eccentric ellipse 4, and the cutting edge structure 3 is an eccentric elliptical arc surface 31. The outer surface of the N-pole rare earth magnetic pole 12 is cut by the eccentric ellipse 4, and the outer surface of the N-pole rare earth magnetic pole 12 is divided into the eccentric elliptical arc surface 31 and the rotor outer arc surface 15.
[0055] In order to ensure uniform distribution of the air gap, the eccentric elliptical arc surface 31 is located on the rotor surface in the middle of the N-pole rare earth pole 12 .
[0056] The distance between the center of the eccentric ellipse 4 and the center of the outer circle 16 of the rotor core is set to D2, the radius of the major axis of the eccentric ellipse 4 is set to X, and the radius of the minor axis of the eccentric ellipse 4 is set to Y, wherein 44mm≤D2≤45mm, 34.5mm≤X≤35.5, and 15.5mm≤Y≤16mm. By limiting the distance between the eccentric ellipse 4 and the center of the outer circle 16 of the rotor core, that is, by limiting the thickness of the eccentric elliptical arc surface 31 along the radial direction of the rotor core 1, the air gap between the rotor structure and the inner circle of the stator structure can be adjusted while avoiding the influence of the motor magnetic field and motor strength degradation caused by the excessive cutting structure 3.
[0057] Preferably, D1=44.7 mm, X=35 mm, and Y=15.8 mm, which is a set of values obtained through multi-objective optimization that greatly improves motor performance.
[0058] Simulation data shows that the peak torque of the rotor topology of this application is improved by 1.1% compared with the rotor structure in the prior art; the torque fluctuation is reduced by 25%; the peak value of the cogging torque of the rotor structure is reduced by 18%; the POT working order torque is significantly reduced, among which T24 is reduced by about 26% and T48 is reduced by about 29%. Figure 6 It can be seen from Figure 8 that the present invention is more effective in reducing torque fluctuation and improving the NVH performance of the motor.
[0059] From the above, it can be seen that the rotor structure of the present invention increases the d-axis air gap length by eccentrically cutting and shaping the surface of the N-pole rare earth pole 12, and maintains the asymmetric pole 11 design of the S-pole rare earth pole 13 surface unchanged, thereby improving the peak torque of the rotor structure, effectively reducing torque fluctuation and cogging torque, and thus improving the NVH performance of the motor.
[0060] See also Figure 9 -12. In another embodiment, the cutting structure is an eccentric circle 5, and the cutting edge structure 3 is an eccentric arc surface 32. The outer surface of the N-pole rare earth magnetic pole 12 is cut by the eccentric circle 5, and the outer surface of the N-pole rare earth magnetic pole 12 is divided into the eccentric arc surface 32 and the rotor outer arc surface 15. To ensure uniform distribution of the air gap, the eccentric arc surface 32 is located on the rotor surface in the middle of the N-pole rare earth magnetic pole 12.
[0061] The distance between the center of the eccentric circle 5 and the center of the outer circle 16 of the rotor core is D2, and the radius of the eccentric circle 5 is R, wherein 11.5 mm ≤ D2 ≤ 12.5 mm, and 72.5 mm ≤ R ≤ 73 mm.
[0062] By limiting the distance between the eccentric circle 5 and the center of the outer circle 16 of the rotor core, that is, by limiting the thickness of the eccentric arc surface 32 along the radial direction of the rotor core 1, the air gap between the rotor structure and the inner circle of the stator structure can be adjusted while avoiding the effects of the motor magnetic field and motor strength degradation caused by the excessive cutting structure 3.
[0063] Preferably, D2 = 12.3 mm, R = 72.8 mm, which is a set of values obtained through multi-objective optimization that greatly improves motor performance.
[0064] See also Figure 13 -16. In other embodiments, the cutting structure is a cutting straight line 6, and the tangent structure 3 is a cutting straight line 6. The outer surface of the N-pole rare earth magnetic pole 12 is cut by the cutting straight line 6, and the outer surface of the N-pole rare earth magnetic pole 12 is divided into a cutting straight line segment 33 and the rotor outer arc surface 15, and the distance between the cutting straight line segment 33 and the outer circle 16 of the rotor core is D3, where 60mm≤D3≤60.8mm.
[0065] By limiting the distance between the cutting line 6 and the center of the outer circle 16 of the rotor core, that is, by limiting the thickness of the cutting line segment 33 along the radial direction of the rotor core 1, the air gap between the rotor structure and the inner circle of the stator structure can be adjusted while avoiding the effects of the motor magnetic field and motor strength degradation caused by an excessively large cutting edge structure 3.
[0066] Preferably, D3=60.3 mm, which is a value that greatly improves motor performance obtained through multi-objective optimization.
[0067] The cutting straight line segment 33 is arranged perpendicular to the d-axis, which ensures that the magnetic lines flow evenly from the outer surface of the N-pole rare earth pole 12 on the one hand, and ensures that the air gap between the rotor structure and the stator structure is evenly distributed on the other hand, thereby preventing noise problems when the motor is running.
[0068] See also Figure 17 -18. Multi-layer permanent magnet units 14 are spaced apart along the radial direction of the rotor core 1. By arranging multi-layer permanent magnet units 14 on the rotor core 1, it is beneficial to generate the power required for rotation through the cooperation between the permanent magnet units 14 and the stator structure of the motor.
[0069] The multi-layer permanent magnet unit 14 includes a permanent magnet slot 141 and a permanent magnet 142 disposed in the permanent magnet slot 141 .
[0070] Specifically, the multi-layer permanent magnet unit 14 is further divided into a first permanent magnet unit 143 and a second permanent magnet unit 144. The first permanent magnet unit 143 and the second permanent magnet unit 144 are symmetrically arranged relative to the d-axis, wherein, for the rotor structure, the d-axis refers to the axis where the symmetry center line of the magnetic pole 11 is located, and the q-axis refers to the axis rotated 90° electrical angle with the d-axis.
[0071] The first permanent magnet unit 143 includes a first permanent magnet slot and a first permanent magnet disposed in the first permanent magnet slot, and the second permanent magnet unit 144 includes a second permanent magnet slot and a second permanent magnet disposed in the second permanent magnet slot, so as to ensure the stability of the provided magnetic field.
[0072] The distances from the first permanent magnets and the second permanent magnets to the d-axis gradually increase in a direction approaching the rotation center of the rotor core 1 , so that the permanent magnets 142 can provide a stronger magnetic field, thereby increasing the output torque of the motor.
[0073] Both the first permanent magnet and the second permanent magnet are rare earth permanent magnets, and both the first permanent magnet and the second permanent magnet are arc-shaped, which is the preferred structural form of the rotor core 1 and the motor of the present application. The arc-shaped permanent magnet 142 can optimize the magnetic line distribution of the present application, thereby reducing the torque fluctuation of the motor.
[0074] The direction of the magnetic lines of force is determined by the direction of magnetization (see Figure 18 ), the magnetization direction is along the radial magnetization direction of the arc-shaped permanent magnet, the magnetic lines of force of the S-pole rare earth pole 13 and the N-pole rare earth pole 12 are in opposite directions, that is, the magnetization directions are opposite, the magnetization direction of the N-pole permanent magnet points to the center of the circle along the radius of the arc-shaped permanent magnet, and the magnetization direction of the S-pole permanent magnet points away from the center of the circle along the radius of the arc-shaped permanent magnet.
[0075] At the same time, a magnetic barrier 7 is also provided on the rotor core 1 (see Figure 17 ), the magnetic barrier 7 has multiple layers, and each magnetic barrier 7 is arranged on one side of the permanent magnet slot 141, which is used to make the rotor core 1 have a larger salient pole ratio, so that the motor composed of the rotor core 1 has a larger proportion of magnetic resistance torque, which can further reduce the torque fluctuation of the motor.
[0076] The rotor core 1 is provided with a weight-reducing hole 8 (see Figure 17 ), specifically, each magnetic pole 11 is provided with a weight-reducing hole 8, the weight-reducing holes 8 are symmetrically arranged about the d axis, and the weight-reducing holes 8 are arranged at intervals in the circumferential direction of the rotor core 1. By setting the weight-reducing holes 8 and setting the weight-reducing holes 8 close to the inner circle center of the rotor core, on the one hand, the weight of the rotor core 1 can be reduced, and on the other hand, the moment of inertia of the rotor structure can be reduced so that it reaches a balance point, thereby reducing the weight of the motor while improving the performance of the motor.
[0077] An embodiment of the present invention further provides a motor having the above-mentioned rotor structure. The motor provided by the embodiment of the present invention has the same technical effects as the above-mentioned rotor structure, which will not be described one by one here.
[0078] The motor provided by the present invention further includes a stator structure. The rotor structure is rotatably disposed in the stator structure. An air gap is formed between the rotor structure and the stator structure to prevent direct contact between the rotor structure and the stator structure.
[0079] By setting a cutting edge structure 3 on the rotor core 1 in the above-mentioned rotor structure, the air gap length on the d-axis can be increased, the air gap magnetic resistance is increased, the air gap magnetic field is optimized, and the magnetic resistance torque is increased to compensate for the leakage magnetic field caused by the setting of the reinforcement rib 2, which leads to a decrease in the permanent magnet torque, thereby improving the utilization rate of the permanent magnet 142, improving the peak torque of the motor, and improving the NVH performance of the motor.
[0080] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0081] It should be noted that, unless there is any conflict, the features in the embodiments of this application can be combined with each other.
[0082] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.
Claims
1. A rotor structure, characterized in that: include: A rotor core, wherein a plurality of magnetic poles are arranged in a circumferential direction of the rotor core, wherein the plurality of magnetic poles include N-pole rare earth magnetic poles and S-pole rare earth magnetic poles arranged at intervals from each other, and each of the magnetic poles is provided with a multi-layer permanent magnet unit, and the multi-layer permanent magnet units are symmetrically distributed about the d-axis; A reinforcing rib, arranged between the symmetrical permanent magnet units; A trimming structure, wherein the outer surface of the N-pole rare earth magnetic pole has a trimming structure corresponding to the permanent magnet unit, and the trimming structure is an eccentric elliptical arc surface, an eccentric circular arc surface or a cutting straight line segment connected to the outer surface of the S-pole rare earth magnetic pole.
2. The rotor structure according to claim 1, characterized in that: The distance between the center of the ellipse forming the eccentric elliptical arc surface and the center of the outer circle of the rotor core is D1, the radius of the major axis of the ellipse is X, and the radius of the minor axis of the ellipse is Y, wherein 44mm≤D1≤45mm, 34.5mm≤X≤35.5mm, and 15.5mm≤Y≤16mm.
3. The rotor structure according to claim 1, characterized in that: The distance between the center of the eccentric circle forming the eccentric arc surface and the center of the outer circle of the rotor core is D2, and the radius of the eccentric circle is R, wherein 11.5 mm ≤ D2 ≤ 12.5 mm, and 72.5 mm ≤ R ≤ 73 mm.
4. The rotor structure according to claim 1, characterized in that: The distance between the cutting straight line segment and the center of the outer circle of the rotor core is D3, wherein 60 mm ≤ D3 ≤ 60.8 mm.
5. The rotor structure according to claim 4, characterized in that: The cutting straight line segment is arranged perpendicular to the d-axis.
6. The rotor structure according to claim 1, characterized in that: The multiple layers of permanent magnet units are arranged at intervals along the radial direction of the rotor core. The permanent magnet units include permanent magnet slots and permanent magnets arranged in the permanent magnet slots. The permanent magnets are arc-shaped.
7. The rotor structure according to claim 6, characterized in that: A magnetic barrier is also arranged on the rotor core, and the magnetic barrier is arranged on one side of the permanent magnet slot.
8. The rotor structure according to claim 6, characterized in that: The distances between the plurality of permanent magnets and the d-axis gradually increase in a direction approaching a rotation center of the rotor core.
9. The rotor structure according to claim 1, characterized in that: Each of the magnetic poles is provided with a weight-reducing hole, the weight-reducing holes are symmetrically arranged about the d-axis, and the weight-reducing holes are arranged at intervals in the circumferential direction of the rotor core.
10. A motor, characterized in that: It comprises a stator structure and a rotor structure according to any one of claims 1 to 9, wherein the rotor structure is rotatably arranged in the stator structure, and an air gap is formed between the rotor structure and the stator structure.