Rotor lamination, rotor structure and permanent magnet motor

Abstract

This invention provides a rotor lamination, a rotor structure, and a permanent magnet motor. The rotor lamination has: multiple magnetic steel slots, which are arranged sequentially and at intervals along the circumference of the rotor lamination; and multiple magnetic flux guiding slot groups, each of which includes one or more magnetic flux guiding slots. For any given magnetic flux guiding slot group, it is located between the corresponding magnetic steel slot and the edge of the rotor lamination. Each magnetic flux guiding slot includes a first slot segment and a second slot segment. The first slot segment extends circumferentially along the rotor lamination, and the extension direction of the second slot segment forms a preset angle with the radial direction of the rotor lamination, the preset angle ranging from 0° to 15°. The rotor lamination of this invention solves the technical problems of high vibration and noise in permanent magnet motors in related technologies.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motors, and more specifically, to a rotor lamination, a rotor structure, and a permanent magnet motor. Background Technology

[0002] Permanent magnet motors are widely used in various devices, but some permanent magnet motors have significant vibration and noise problems during actual use. In particular, fractional slot concentrated winding permanent magnet motors are often accompanied by severe vibration and noise during operation, causing inconvenience to users.

[0003] It is evident that permanent magnet motors in related technologies suffer from significant vibration and noise issues, and no effective solution has yet been proposed to address these problems. Summary of the Invention

[0004] The main objective of this invention is to provide a rotor lamination, rotor structure, and permanent magnet motor to solve the technical problems of high vibration and noise in permanent magnet motors in related technologies.

[0005] To achieve the above objectives, according to one aspect of the present invention, a rotor lamination is provided, the rotor lamination having: a plurality of magnet slots, the plurality of magnet slots being arranged sequentially at intervals along the circumference of the rotor lamination; a plurality of magnetic flux guiding slot groups, each magnetic flux guiding slot group including one or more magnetic flux guiding slots, wherein for any magnetic flux guiding slot group, it is located between the corresponding magnet slot and the edge of the rotor lamination; wherein the magnetic flux guiding slot includes a first slot segment and a second slot segment, the first slot segment extending along the circumference of the rotor lamination, and the extension direction of the second slot segment forming a preset angle with the radial direction of the rotor lamination, the preset angle being in the range of 0° to 15°.

[0006] Furthermore, for any magnetic flux guide slot, the distance from the first slot segment to the edge of the rotor lamination is less than the distance from the second slot segment to the edge of the rotor lamination.

[0007] Furthermore, for any magnetic flux guide slot, the first slot segment and the second slot segment are arranged radially spaced along the rotor lamination; or, for any magnetic flux guide slot, the first slot segment and the second slot segment are connected.

[0008] Furthermore, for any magnetic flux guide slot, the first slot segment and the second slot segment are arranged sequentially along the circumference of the rotor lamination.

[0009] Furthermore, for any magnetic flux guide slot, the maximum dimension of the first slot segment along the circumference of the rotor lamination is greater than the maximum dimension of the second slot segment along the circumference of the rotor lamination.

[0010] Furthermore, in the case where the magnetic flux guide slot group includes multiple magnetic flux guide slots, the multiple magnetic flux guide slots are arranged sequentially at intervals along the circumference of the rotor lamination.

[0011] Furthermore, the structure of the rotor lamination satisfies d2 / d1>1.5 and d4 / d3>2, where d2 is the maximum dimension of the first segment of the first guide groove along the circumference of the rotor lamination, d1 is the maximum dimension of the second segment of the first guide groove along the circumference of the rotor lamination, d4 is the maximum dimension of the first segment of the second guide groove along the circumference of the rotor lamination, and d3 is the maximum dimension of the second segment of the second guide groove along the circumference of the rotor lamination. The first guide groove is the magnetic flux guide groove located at the end of a single magnetic flux guide groove group, and the second guide groove is the magnetic flux guide groove adjacent to the first guide groove in the same magnetic flux guide groove group.

[0012] Furthermore, multiple magnetic flux guide slots belonging to the same magnetic flux guide slot group are symmetrically arranged with respect to a preset axis, which is the axis of symmetry of the magnetic steel slot corresponding to the magnetic flux guide slot group.

[0013] Furthermore, for multiple magnetic flux guiding grooves belonging to the same magnetic flux guiding groove group, along the direction close to the preset axis, the length of the second groove segment of the multiple magnetic flux guiding grooves gradually increases along its extension direction, and the preset axis is the axis of symmetry of the magnetic steel groove corresponding to the magnetic flux guiding groove group.

[0014] Furthermore, the number of magnetic flux guide slots is the same as the number of magnetic steel slots, and the positions of multiple magnetic flux guide slots correspond one-to-one with the positions of multiple magnetic steel slots.

[0015] According to another aspect of the present invention, a rotor structure is provided, the rotor structure comprising a plurality of rotor laminations stacked sequentially, wherein the rotor laminations are the rotor laminations described above.

[0016] According to another aspect of the present invention, a permanent magnet motor is provided, the permanent magnet motor including a rotor structure and a stator structure, wherein the rotor structure is the rotor structure described above.

[0017] The rotor lamination of this invention is provided with: a plurality of magnetic steel slots, which are arranged sequentially at intervals along the circumference of the rotor lamination; a plurality of magnetic flux guiding slot groups, each magnetic flux guiding slot group including one or more magnetic flux guiding slots, wherein any magnetic flux guiding slot group is located between the corresponding magnetic steel slot and the edge of the rotor lamination; wherein the magnetic flux guiding slot includes a first slot segment and a second slot segment, the first slot segment extends along the circumference of the rotor lamination, and the extension direction of the second slot segment forms a preset angle with the radial direction of the rotor lamination, the preset angle being in the range of 0° to 15°. The rotor lamination with this structural design incorporates a magnetic flux guiding slot group. This group includes at least one magnetic flux guiding slot, designed with a specific structure comprising a first slot segment and a second slot segment. The first slot segment extends circumferentially along the rotor lamination, guiding the stator armature magnetic field and effectively reducing its harmonics. The second slot segment extends at an angle of 0° to 15° to the radial direction of the rotor lamination. This means the second slot segment can extend radially along the rotor lamination or be inclined at an angle less than or equal to 15°. This second slot segment guides the rotor permanent magnet magnetic field, weakening its harmonics. By combining the first and second slot segments, the design effectively organizes and optimizes the motor's magnetic field lines, reducing disordered magnetic field distribution and effectively lowering the harmonic content of the magnetic field in the stator-rotor air gap. This, in turn, helps reduce the vibration and noise of the permanent magnet motor, solving the technical problem of high vibration and noise in permanent magnet motors in related technologies. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the first embodiment of the rotor lamination of the present invention;

[0020] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0021] Figure 3 This is a schematic diagram of the structure of a second embodiment of the rotor lamination of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the third embodiment of the rotor lamination of the present invention;

[0023] Figure 5 This is a schematic diagram of the fourth embodiment of the rotor lamination of the present invention;

[0024] Figure 6This is a schematic diagram of the structure of an embodiment of the permanent magnet motor of the present invention;

[0025] Figure 7 This is a schematic diagram comparing the harmonic content and harmonic distortion rate of the permanent magnet motor embodiments (Scheme 1 and Scheme 2) of the present invention with those of the permanent magnet motor (original scheme) in the related art.

[0026] Figure 8 This is a schematic diagram comparing the electromagnetic noise of the permanent magnet motor embodiments (Scheme 1 and Scheme 2) of the present invention with that of the permanent magnet motor (original scheme) in the related art.

[0027] The above figures include the following reference numerals:

[0028] 1. Magnet slot; 2. Magnetic flux guide slot group; 21. Magnetic flux guide slot; 211. First slot section; 212. Second slot section; 10. Rotor structure; 20. Stator structure. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Please refer to Figures 1 to 8 To achieve the above objectives, embodiments of the present invention provide a rotor lamination having: a plurality of magnet slots 1, the plurality of magnet slots 1 being arranged sequentially at intervals along the circumference of the rotor lamination; a plurality of magnetic flux guiding slot groups 2, each magnetic flux guiding slot group 2 including one or more magnetic flux guiding slots 21, wherein any magnetic flux guiding slot group 2 is located between the corresponding magnet slot 1 and the edge of the rotor lamination; wherein the magnetic flux guiding slot 21 includes a first slot segment 211 and a second slot segment 212, the first slot segment 211 extending along the circumference of the rotor lamination, and the extension direction of the second slot segment 212 forming a preset angle with the radial direction of the rotor lamination, the preset angle being in the range of 0° to 15°.

[0031] The rotor lamination with this structural design incorporates a magnetic flux guiding slot group 2, which includes at least one magnetic flux guiding slot 21. This magnetic flux guiding slot 21 is designed with a special structure, specifically comprising a first slot segment 211 and a second slot segment 212. The first slot segment 211 extends circumferentially along the rotor lamination and guides the stator armature magnetic field, effectively reducing harmonics. The second slot segment 212 extends at an angle of 0° to 15° to the radial direction of the rotor lamination; that is, the second slot segment 212 can extend radially along the rotor lamination. The extended structure can also be a structure inclined to the radial direction of the rotor lamination, with an inclination angle of less than or equal to 15°. The second slot segment 212 can guide the magnetic field of the rotor permanent magnet and weaken the harmonics of the rotor permanent magnet magnetic field. By combining the design of the first slot segment 211 and the second slot segment 212, the magnetic field lines of the motor are sorted and optimized, reducing the disordered magnetic field distribution. This can effectively reduce the harmonic content of the magnetic field in the stator and rotor air gap, thereby helping to reduce the vibration and noise of the permanent magnet motor and solving the technical problem of large vibration and noise of permanent magnet motors in related technologies.

[0032] As shown above, the extension direction of the second slot segment 212 forms an angle of 0° to 15° with the radial direction of the rotor lamination, for example... Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, in these embodiments, the extension direction of the second slot segment 212 is consistent with the radial direction of the rotor lamination, i.e., at a 0° angle. In other embodiments, the extension direction of the second slot segment 212 may also deviate to a certain extent from the radial direction of the rotor lamination, for example... Figure 3 As shown, in this embodiment, the extension direction of the second slot segment 212 has a small tilt angle relative to the radial direction of the rotor lamination.

[0033] The so-called extension direction of the first slot segment 211 or the second slot segment 212 is the length direction of the first slot segment 211 or the second slot segment 212, and the slot has a longer length along its extension direction than other directions. In addition, it should be noted that the magnetic flux guide slot 21 is a through hole that penetrates the rotor lamination. When multiple rotor laminations are stacked in sequence, an axial through hole will be formed on the rotor core.

[0034] In a preferred embodiment, for any magnetic flux guide slot 21, the distance from the first slot segment 211 to the edge of the rotor lamination is less than the distance from the second slot segment 212 to the edge of the rotor lamination.

[0035] In other words, the second slot segment 212 is closer to the center of the rotor lamination than the first slot segment 211. In this embodiment, the first slot segment 211 is closer to the edge of the rotor lamination than the second slot segment 212. Therefore, after installation, the first slot segment 211 will be closer to the stator structure, thereby guiding the armature magnetic field of the stator structure and reducing its harmonic content. The second slot segment 212 is closer to the magnet slot 1, thereby better guiding the magnetic field generated by the permanent magnet in the magnet slot 1 and reducing the harmonics of the permanent magnet magnetic field. In this way, the harmonic reduction capabilities of the first slot segment 211 and the second slot segment 212 can be maximized, and the vibration and noise of the permanent magnet motor can be better optimized.

[0036] Regarding the relative positional relationship between the first slot segment 211 and the second slot segment 212, different selection methods can be used in actual implementation:

[0037] For example, for any magnetic flux guide slot 21, the first slot segment 211 and the second slot segment 212 are arranged at radial intervals along the rotor lamination.

[0038] For example, for any magnetic flux guiding slot 21, the first slot segment 211 is connected to the second slot segment 212.

[0039] In this embodiment, as Figures 1 to 3 As shown, in these embodiments, the first slot segment 211 and the second slot segment 212 are separately arranged, such as... Figure 4 and Figure 5 In this embodiment, the first slot 211 is connected to the second slot 212.

[0040] For example, for any magnetic flux guide slot 21, the first slot segment 211 and the second slot segment 212 are arranged sequentially along the circumference of the rotor lamination.

[0041] In the above Figures 1 to 5 In the corresponding embodiment, the first slot segment 211 and the second slot segment 212 are arranged sequentially along the radial direction of the rotor lamination. This better ensures that the first slot segment 211 is closer to the edge of the rotor lamination, and the second slot segment 212 is closer to the magnet slot 1 of the rotor lamination, thereby ensuring the magnetic flux guiding function of the magnetic flux guiding slot 21. In other optional embodiments, the first slot segment 211 and the second slot segment 212 may not be arranged sequentially along the radial direction of the rotor lamination, but rather sequentially along the circumferential direction, that is, the second slot segment 212 is located on one side of the first slot segment 211. Although the magnetic flux guiding capability may be reduced to some extent due to the second slot segment 212 being located next to the first slot segment 211, it is beneficial for optimizing the layout of related structures on the rotor in some cases. Therefore, this scheme of the second slot segment 212 being located next to the first slot segment 211 can also be adopted in actual implementation.

[0042] The embodiments of the present invention do not specify the specific shape of each slot segment. In actual implementation, the specific shapes of each first slot segment 211 and second slot segment 212 can be flexibly set, such as... Figures 1 to 5 As shown, each slot segment can be Figures 1 to 4 The waist-shaped hole in the design refers to a hole with a smooth, rounded edge. It can also be a rectangular hole or a parallelogram hole, among other structures.

[0043] In a preferred embodiment, for any magnetic flux guide slot 21, the maximum dimension of the first slot segment 211 along the circumferential direction of the rotor lamination is greater than the maximum dimension of the second slot segment 212 along the circumferential direction of the rotor lamination.

[0044] like Figure 2 As shown in this embodiment, for any magnetic flux guide slot 21, the size of the first slot segment 211 is larger than the size of the second slot segment 212 along the circumference of the rotor lamination, i.e., d2 > d1, d4 > d3. Although the second slot segment 212 can improve the harmonic effect of the rotor permanent magnet, if its size along the rotor circumference is too large, it will affect the rotor's external magnetic properties and back EMF, reducing motor performance. The first slot segment 211 has a more significant effect on improving the harmonics of the stator armature magnetic field. After adopting the above structural design, the motor performance, electromagnetic noise, and manufacturing difficulty can be balanced, which has good practical value.

[0045] Specifically, when the magnetic flux guide slot group 2 includes multiple magnetic flux guide slots 21, the multiple magnetic flux guide slots 21 are arranged sequentially at intervals along the circumference of the rotor laminations.

[0046] In this embodiment, by setting multiple magnetic flux guide slots 21, which are arranged sequentially along the circumference of the rotor lamination, a reasonable arrangement of the magnetic flux guide slots 21 is achieved. This allows the guiding effect of multiple magnetic flux guide slots 21 on the magnetic flux to be superimposed, which can better weaken harmonics and improve motor vibration and noise problems.

[0047] Preferably, the structure of the rotor lamination satisfies d2 / d1>1.5 and d4 / d3>2, where d2 is the maximum dimension of the first segment 211 of the first guide groove along the circumference of the rotor lamination, d1 is the maximum dimension of the second segment 212 of the first guide groove along the circumference of the rotor lamination, d4 is the maximum dimension of the first segment 211 of the second guide groove along the circumference of the rotor lamination, and d3 is the maximum dimension of the second segment 212 of the second guide groove along the circumference of the rotor lamination. The first guide groove is the magnetic flux guide groove 21 located at the end of a single magnetic flux guide groove group 2, and the second guide groove is the magnetic flux guide groove 21 adjacent to the first guide groove in the same magnetic flux guide groove group 2.

[0048] In this embodiment, multiple magnetic flux guide grooves 21 belonging to the same magnetic flux guide groove group 2 are symmetrically arranged with respect to a preset axis, which is the axis of symmetry of the magnetic steel groove 1 corresponding to the magnetic flux guide groove group 2.

[0049] Specifically, for multiple magnetic flux guide grooves 21 belonging to the same magnetic flux guide groove group 2, along the direction close to the preset axis, the length of the second groove segment 212 of the multiple magnetic flux guide grooves 21 gradually increases along its extension direction, and the preset axis is the axis of symmetry of the magnetic steel groove 1 corresponding to the magnetic flux guide groove group 2.

[0050] In this embodiment, the magnet slot 1 is a V-shaped slot, with the opening direction of the V-shaped slot facing away from the center of the rotor lamination. Multiple magnet guide slots 21 belonging to the same magnet guide slot group 2 have their second slot segment 212 gradually increased in length along its extension direction, close to the preset axis. This makes full use of the space around the magnet slot 1 and increases the length of the second slot segment 212, thereby improving its guiding effect on the magnetic field generated by the permanent magnet. This helps to organize and optimize the magnetic field lines of the rotor, reduce the chaotic magnetic field distribution, better weaken the harmonics of the permanent magnet, and control the vibration and noise of the motor.

[0051] Specifically, the number of magnetic flux guide slot groups 2 is the same as the number of magnetic steel slots 1, and the positions of multiple magnetic flux guide slot groups 2 and multiple magnetic steel slots 1 correspond one-to-one.

[0052] In addition, embodiments of the present invention also provide a rotor structure, which includes a plurality of rotor laminations stacked sequentially, wherein the rotor laminations are the rotor laminations described above.

[0053] Finally, an embodiment of the present invention also provides a permanent magnet motor, which includes a rotor structure 10 and a stator structure 20, wherein the rotor structure is the rotor structure described above.

[0054] In a preferred embodiment, the permanent magnet motor described above is a fractional-slot permanent magnet motor, specifically, it can be a 65 / 8-pole, 10-pole, or other centrally wound motor, with a built-in rotor structure. As a preferred embodiment, the permanent magnet motor operates at speeds ranging from 0 rpm to 10,000 rpm to ensure that, based on the aforementioned structural design, it exhibits low operating vibration intensity and low noise.

[0055] like Figure 7 and Figure 8 As shown, Figure 7 This is a schematic diagram comparing the harmonic content and harmonic distortion rate of the permanent magnet motor embodiments (Scheme 1 and Scheme 2) of the present invention with those of the permanent magnet motor (original scheme) in the related art. Figure 8 This is a schematic diagram comparing the electromagnetic noise of embodiments of the permanent magnet motor of the present invention (Scheme 1 and Scheme 2) with that of a permanent magnet motor in the related art (original scheme). From Figure 7As can be seen, compared with the permanent magnet motor (original scheme) in the related art, the embodiments of the permanent magnet motor of the present invention (Scheme 1 and Scheme 2) show a significant reduction in the content of each harmonic and the harmonic distortion rate. This indicates a significant reduction in harmonics, which has a positive effect on improving the vibration and noise of the permanent magnet motor. Figure 8 As can be seen from the embodiments of the permanent magnet motor of the present invention (Scheme 1 and Scheme 2) are significantly less electromagnetic than the permanent magnet motor (original scheme) in the related art.

[0056] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0057] The rotor lamination of this embodiment of the invention is provided with: a plurality of magnetic steel slots 1, which are arranged sequentially at intervals along the circumference of the rotor lamination; a plurality of magnetic flux guiding slot groups 2, each magnetic flux guiding slot group 2 including one or more magnetic flux guiding slots 21, wherein any magnetic flux guiding slot group 2 is located between the corresponding magnetic steel slot 1 and the edge of the rotor lamination; wherein the magnetic flux guiding slot 21 includes a first slot segment 211 and a second slot segment 212, the first slot segment 211 extends along the circumference of the rotor lamination, and the extension direction of the second slot segment 212 forms a preset angle with the radial direction of the rotor lamination, the preset angle being in the range of 0° to 15°. The rotor lamination with this structural design incorporates a magnetic flux guiding slot group 2, which includes at least one magnetic flux guiding slot 21. This magnetic flux guiding slot 21 is designed with a special structure, specifically comprising a first slot segment 211 and a second slot segment 212. The first slot segment 211 extends circumferentially along the rotor lamination and guides the stator armature magnetic field, effectively reducing harmonics. The second slot segment 212 extends at an angle of 0° to 15° to the radial direction of the rotor lamination; that is, the second slot segment 212 can extend radially along the rotor lamination. The extended structure can also be a structure inclined to the radial direction of the rotor lamination, with an inclination angle of less than or equal to 15°. The second slot segment 212 can guide the magnetic field of the rotor permanent magnet and weaken the harmonics of the rotor permanent magnet magnetic field. By combining the design of the first slot segment 211 and the second slot segment 212, the magnetic field lines of the motor are sorted and optimized, reducing the disordered magnetic field distribution. This can effectively reduce the harmonic content of the magnetic field in the stator and rotor air gap, thereby helping to reduce the vibration and noise of the permanent magnet motor and solving the technical problem of large vibration and noise of permanent magnet motors in related technologies.

[0058] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0059] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0060] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rotor lamination, characterized in that, The rotor lamination is provided with: Multiple magnet slots (1) are arranged sequentially at intervals along the circumference of the rotor laminations; Multiple magnetic flux guide slot groups (2), each of the magnetic flux guide slot groups (2) includes one or more magnetic flux guide slots (21), and for any one of the magnetic flux guide slot groups (2), it is located between the corresponding magnetic steel slot (1) and the edge of the rotor lamination; The magnetic flux guide groove (21) includes a first groove segment (211) and a second groove segment (212). The first groove segment (211) extends circumferentially along the rotor lamination, and the extension direction of the second groove segment (212) forms a preset angle with the radial direction of the rotor lamination. The preset angle ranges from 0° to 15°.

2. The rotor lamination according to claim 1, characterized in that, For any one of the magnetic flux guide slots (21), the distance from the first slot segment (211) to the edge of the rotor lamination is less than the distance from the second slot segment (212) to the edge of the rotor lamination.

3. The rotor lamination according to claim 2, characterized in that, For any one of the magnetic flux guide slots (21), the first slot segment (211) and the second slot segment (212) are arranged radially apart along the rotor lamination; or, for any one of the magnetic flux guide slots (21), the first slot segment (211) and the second slot segment (212) are connected.

4. The rotor lamination according to claim 2, characterized in that, For any one of the magnetic flux guide slots (21), the first slot segment (211) and the second slot segment (212) are arranged sequentially along the circumference of the rotor lamination.

5. The rotor lamination according to claim 1, characterized in that, For any one of the magnetic flux guide slots (21), the maximum dimension of the first slot segment (211) along the circumferential direction of the rotor lamination is greater than the maximum dimension of the second slot segment (212) along the circumferential direction of the rotor lamination.

6. The rotor lamination according to any one of claims 1 to 5, characterized in that, When the magnetic flux guide slot group (2) includes a plurality of magnetic flux guide slots (21), the plurality of magnetic flux guide slots (21) are arranged sequentially at intervals along the circumference of the rotor lamination.

7. The rotor lamination according to claim 6, characterized in that, The structure of the rotor lamination satisfies d2 / d1>1.5, d4 / d3>2, where d2 is the maximum dimension of the first groove segment (211) of the first guide groove along the circumference of the rotor lamination, d1 is the maximum dimension of the second groove segment (212) of the first guide groove along the circumference of the rotor lamination, d4 is the maximum dimension of the first groove segment (211) of the second guide groove along the circumference of the rotor lamination, and d3 is the maximum dimension of the second groove segment (212) of the second guide groove along the circumference of the rotor lamination. The first guide groove is the magnetic flux guide groove (21) located at the end of a single magnetic flux guide groove group (2), and the second guide groove is the magnetic flux guide groove (21) adjacent to the first guide groove in the same magnetic flux guide groove group (2).

8. The rotor lamination according to claim 6, characterized in that, Multiple magnetic flux guide grooves (21) belonging to the same magnetic flux guide groove group (2) are symmetrically arranged with respect to a preset axis, which is the axis of symmetry of the magnetic steel groove (1) corresponding to the magnetic flux guide groove group (2).

9. The rotor lamination according to claim 6, characterized in that, For multiple magnetic flux guide grooves (21) belonging to the same magnetic flux guide groove group (2), along the direction close to the preset axis, the length of the second groove segment (212) of the multiple magnetic flux guide grooves (21) gradually increases along its extension direction, and the preset axis is the axis of symmetry of the magnetic steel groove (1) corresponding to the magnetic flux guide groove group (2).

10. The rotor lamination according to claim 1, characterized in that, The number of magnetic flux guide slot groups (2) is the same as the number of magnetic steel slots (1), and the positions of the multiple magnetic flux guide slot groups (2) and the multiple magnetic steel slots (1) correspond one-to-one.

11. A rotor structure, characterized in that, The rotor structure includes a plurality of rotor laminations stacked sequentially, wherein the rotor laminations are the rotor laminations according to any one of claims 1 to 10.

12. A permanent magnet motor, characterized in that, The permanent magnet motor includes a rotor structure (10) and a stator structure (20), wherein the rotor structure is the rotor structure as described in claim 11.

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