Rotor punching sheet, rotor structure and permanent magnet motor

Abstract

The utility model provides a rotor punching sheet, a rotor structure and a permanent magnet motor, and the rotor punching sheet is provided with a plurality of magnetic steel grooves which are sequentially arranged at intervals along the circumferential direction of the rotor punching sheet; a plurality of magnetic bundle guide groove groups, each magnetic bundle guide groove group comprises one or more magnetic bundle guide grooves, and any magnetic bundle guide groove group is located between the corresponding magnetic steel groove and the edge of the rotor punching sheet; wherein the magnetic bundle guide groove comprises a first groove section and a second groove section, the first groove section extends along the circumferential direction of the rotor punching sheet, a preset included angle is formed between the extension direction of the second groove section and the radial direction of the rotor punching sheet, and the value range of the preset included angle is 0-15 degrees. The rotor punching sheet provided by the utility model solves the technical problems of large vibration and noise of a permanent magnet motor in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of permanent magnet motor, specifically, a rotor lamination, rotor structure and permanent magnet motor. BACKGROUND

[0002] The permanent magnet motor in the related art is widely applied in various devices, but some permanent magnet motors have big vibration and noise problems in actual use, especially for the fractional-slot concentrated winding permanent magnet motor, which often accompanies serious vibration and noise in the working process, which brings inconvenience to the user.

[0003] It can be seen that the permanent magnet motor in the related art has the technical problem of big vibration and noise, and currently no effective solution has been proposed for this technical problem. SUMMARY

[0004] The main purpose of the utility model is to provide a rotor lamination, rotor structure and permanent magnet motor to solve the technical problem of big vibration and noise of the permanent magnet motor in the related art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a rotor lamination is provided, which is provided with: a plurality of magnetic steel grooves, the plurality of magnetic steel grooves are sequentially and spacedly arranged along the circumference of the rotor lamination; a plurality of magnetic flux guide groove groups, each magnetic flux guide groove group includes one or more magnetic flux guide grooves, and for any one magnetic flux guide groove group, it is located between the corresponding magnetic steel groove and the edge of the rotor lamination; wherein the magnetic flux guide groove includes a first groove section and a second groove section, the first groove section is arranged along the circumference of the rotor lamination, and the extension direction of the second groove section forms a preset angle with the radial direction of the rotor lamination, and the value range of the preset angle is 0° to 15°.

[0006] Further, for any one magnetic flux guide groove, the distance from the first groove section to the edge of the rotor lamination is less than the distance from the second groove section to the edge of the rotor lamination.

[0007] Further, for any one magnetic flux guide groove, the first groove section and the second groove section are spacedly arranged along the radial direction of the rotor lamination; or for any one magnetic flux guide groove, the first groove section and the second groove section are communicated.

[0008] Further, for any one magnetic flux guide groove, the first groove section and the second groove section are sequentially arranged along the circumference of the rotor lamination.

[0009] Further, for any one magnetic flux guide groove, the maximum size of the first groove section along the circumference of the rotor lamination is greater than the maximum size of the second groove section along the circumference of the rotor lamination.

[0010] Further, in the case that the magnetic flux guiding groove group comprises a plurality of magnetic flux guiding grooves, the plurality of magnetic flux guiding grooves are sequentially and spacedly arranged along the circumferential direction of the rotor lamination.

[0011] Further, the structure of the rotor lamination satisfies d2 / d1>1.5 and d4 / d3>2, wherein d2 is the maximum size of the first slot section of the first guiding groove along the circumferential direction of the rotor lamination, d1 is the maximum size of the second slot section of the first guiding groove along the circumferential direction of the rotor lamination, d4 is the maximum size of the first slot section of the second guiding groove along the circumferential direction of the rotor lamination, and d3 is the maximum size of the second slot section of the second guiding groove along the circumferential direction of the rotor lamination, the first guiding groove is the magnetic flux guiding groove located at the end in the single magnetic flux guiding groove group, and the second guiding groove is the magnetic flux guiding groove adjacent to the first guiding groove in the same magnetic flux guiding groove group.

[0012] Further, the plurality of magnetic flux guiding grooves belonging to the same magnetic flux guiding groove group are symmetrically arranged relative to a preset axis, and the preset axis is the axis of symmetry of the magnetic steel slot corresponding to the magnetic flux guiding groove group.

[0013] Further, for the plurality of 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 slot section of the plurality of magnetic flux guiding grooves along the extension direction thereof gradually increases, and the preset axis is the axis of symmetry of the magnetic steel slot corresponding to the magnetic flux guiding groove group.

[0014] Further, the number of the magnetic flux guiding groove groups is the same as the number of the magnetic steel slots, and the plurality of magnetic flux guiding groove groups and the plurality of magnetic steel slots correspond one by one in position.

[0015] According to another aspect of the present application, a rotor structure is provided, which comprises a plurality of rotor laminations stacked in sequence, wherein the rotor lamination is the rotor lamination described above.

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

[0017] The rotor punching sheet of the embodiment of the utility model is provided with: multiple magnetic steel grooves, multiple magnetic steel grooves are sequentially and spacedly arranged along the circumference of the rotor punching sheet;Multiple magnetic flux guide groove groups, each magnetic flux guide groove group comprises one or more magnetic flux guide grooves, for any one magnetic flux guide groove group, it is located between the corresponding magnetic steel groove and the edge of the rotor punching sheet;Among them, the magnetic flux guide groove comprises a first groove section and a second groove section, the first groove section is arranged along the circumference of the rotor punching sheet and extends, the extension direction of the second groove section forms a preset angle with the radial direction of the rotor punching sheet, and the preset angle is in the range of 0° to 15°. The rotor punching sheet with the structure design is provided with the magnetic flux guide groove group, the magnetic flux guide groove group comprises at least one magnetic flux guide groove, the magnetic flux guide groove is designed as a special structure, specifically, it comprises a first groove section and a second groove section, the first groove section is arranged along the circumference of the rotor punching sheet and extends, it can guide the stator armature magnetic field, effectively reduce the harmonic of the stator armature magnetic field, the extension direction of the second groove section forms an angle of 0° to 15° with the radial direction of the rotor punching sheet, that is, the second groove section can be a structure extending along the radial direction of the rotor punching sheet, or can be a structure inclined to the radial direction of the rotor punching sheet, and the angle of inclination is less than or equal to 15°, the second groove section can guide the rotor permanent magnet magnetic field, weaken the rotor permanent magnet magnetic field harmonic, through the combination of the above-mentioned first groove section and the above-mentioned second groove section, the effect of arranging and optimizing the magnetic field magnetic force line of the motor is achieved, the distribution of the disordered magnetic field is reduced, the harmonic content of the magnetic field of the stator-rotor air gap can be effectively reduced, thereby the vibration and noise of the permanent magnet motor are reduced, and the technical problem of large vibration and noise of the permanent magnet motor in the related art is solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings accompanying the specification of this application form a part of it, serve to provide further understanding of the present application, and together with the specification explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 It is a structural schematic view of the first embodiment of the rotor punching sheet of the utility model;

[0020] Figure 2 It is a partial enlarged schematic view of Figure 1 ;

[0021] Figure 3 It is a structural schematic view of the second embodiment of the rotor punching sheet of the utility model;

[0022] Figure 4 It is a structural schematic view of the third embodiment of the rotor punching sheet of the utility model;

[0023] Figure 5 It is a structural schematic view of the fourth embodiment of the rotor punching sheet of the utility model;

[0024] Figure 6 Structure diagram of an embodiment of the permanent magnet motor of the utility model;

[0025] Figure 7 Comparison diagram of harmonic content and harmonic distortion rate of the embodiment (scheme one and scheme two) of the permanent magnet motor of the utility model and the permanent magnet motor (original scheme) in the related art;

[0026] Figure 8 Comparison diagram of electromagnetic noise of the embodiment (scheme one and scheme two) of the permanent magnet motor of the utility model and the permanent magnet motor (original scheme) in the related art.

[0027] Among them, the above-mentioned drawings include the following reference signs:

[0028] 1, magnetic steel slot; 2, magnetic flux guide groove group; 21, magnetic flux guide groove; 211, first groove section; 212, second groove section; 10, rotor structure; 20, stator structure. DETAILED DESCRIPTION

[0029] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0030] Please refer to Figures 1 to 8 In order to achieve the above-mentioned purpose, the embodiment of the utility model provides a rotor punching sheet, which is provided with: a plurality of magnetic steel slots 1, the plurality of magnetic steel slots 1 are sequentially and spacedly arranged along the circumference of the rotor punching sheet; a plurality of magnetic flux guide groove groups 2, each magnetic flux guide groove group 2 includes one or more magnetic flux guide grooves 21, for any one magnetic flux guide groove group 2, it is located between the corresponding magnetic steel slot 1 and the edge of the rotor punching sheet; wherein the magnetic flux guide groove 21 includes a first groove section 211 and a second groove section 212, the first groove section 211 is arranged along the circumferential direction of the rotor punching sheet, the extension direction of the second groove section 212 and the radial direction of the rotor punching sheet form a preset angle, the value range of the preset angle is 0° to 15°.

[0031] The rotor lamination adopting the structural design is provided with a magnetic flux guiding groove group 2, the magnetic flux guiding groove group 2 comprises at least one magnetic flux guiding groove 21, the magnetic flux guiding groove 21 is designed as a special structure, specifically, the magnetic flux guiding groove 21 comprises a first groove section 211 and a second groove section 212, the first groove section 211 is arranged along the circumferential direction of the rotor lamination, can guide the stator armature magnetic field, effectively reduces the harmonic of the stator armature magnetic field, the extension direction of the second groove section 212 forms an angle of 0° to 15° with the radial direction of the rotor lamination, that is, the second groove section 212 can be a structure extending along the radial direction of the rotor lamination, or can be a structure inclined to the radial direction of the rotor lamination, and the angle of inclination is less than or equal to 15°, the second groove section 212 can guide the rotor permanent magnet magnetic field, weaken the rotor permanent magnet magnetic field harmonic, through the combination of the above-mentioned first groove section 211 and the above-mentioned second groove section 212, the effect of arranging and optimizing the magnetic field magnetic force line of the motor is achieved, the distribution of the disordered magnetic field is reduced, the harmonic content of the magnetic field of the stator-rotor air gap can be effectively reduced, thereby being beneficial to reducing the vibration and noise of the permanent magnet motor, and solving the technical problem of large vibration and noise of the permanent magnet motor in the related art.

[0032] As described above, the extension direction of the second groove section 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 the embodiments, the extension direction of the second groove section 212 is consistent with the radial direction of the rotor lamination, that is, forms an angle of 0°. In other embodiments, the extension direction of the second groove section 212 can also have a certain deviation with the radial direction of the rotor lamination, for example Figure 3 As shown in the embodiment, the extension direction of the second groove section 212 has a small inclination angle relative to the radial direction of the rotor lamination.

[0033] The extension direction of the first groove section 211 or the second groove section 212, that is, the length direction of the first groove section 211 or the second groove section 212, the groove has a greater length along the extension direction than along other directions. In addition, it should be noted that the magnetic flux guiding groove 21 is a through hole arranged through the rotor lamination, and when a plurality of rotor laminations are stacked in sequence, a through hole penetrating along the axial direction will be formed on the rotor core.

[0034] As a preferred embodiment, for any one magnetic flux guiding groove 21, the distance from the first groove section 211 to the edge of the rotor lamination is less than the distance from the second groove section 212 to the edge of the rotor lamination.

[0035] That is, the second slot section 212 is closer to the center of the rotor lamination relative to the first slot section 211. In the present embodiment, the first slot section 211 is closer to the edge of the rotor lamination relative to the second slot section 212, and thus, after installation, the first slot section 211 is closer to the stator structure, thereby guiding the armature magnetic field of the stator structure and reducing the harmonic content therein. The second slot section 212 is closer to the magnetic steel slot 1, thereby better guiding the magnetic field generated by the permanent magnet in the magnetic steel slot 1 and reducing the harmonic content of the permanent magnet magnetic field, so that the ability of the first slot section 211 and the second slot section 212 to weaken the harmonic can be better exerted, and the vibration and noise of the permanent magnet motor can be better optimized.

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

[0037] For example, for any magnetic flux guiding slot 21, the first slot section 211 and the second slot section 212 are arranged in the radial direction of the rotor lamination.

[0038] For another example, for any magnetic flux guiding slot 21, the first slot section 211 and the second slot section 212 are in communication.

[0039] In the present embodiment, as shown in Figures 1 to 3 In these embodiments, the first slot section 211 and the second slot section 212 are arranged separately, as shown in Figure 4 and Figure 5 In these embodiments, the first slot section 211 and the second slot section 212 are in communication.

[0040] For another example, for any magnetic flux guiding slot 21, the first slot section 211 and the second slot section 212 are arranged in sequence in the circumferential direction of the rotor lamination.

[0041] In the above Figures 1 to 5 corresponding embodiments, the first slot section 211 and the second slot section 212 are arranged in sequence in the radial direction of the rotor lamination, which can better ensure that the first slot section 211 is closer to the edge of the rotor lamination and the second slot section 212 is closer to the magnetic steel slot 1 of the rotor lamination, thereby ensuring the magnetic flux guiding effect of the magnetic flux guiding slot 21. In other optional embodiments, the first slot section 211 and the second slot section 212 can also not be arranged in sequence in the radial direction of the rotor lamination, but can be arranged in sequence in the circumferential direction, i.e., the second slot section 212 is located on one side of the first slot section 211. At this time, although the second slot section 212 is located beside the first slot section 211, the magnetic flux guiding ability may decrease to some extent, but in some cases, it is beneficial to optimize the layout of the relevant structure on the rotor, and thus this scheme of the second slot section 212 being located beside the first slot section 211 can also be used in actual implementation.

[0042] The embodiments of this utility model 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 this utility model also provide a rotor structure, which includes a plurality of rotor laminations stacked sequentially, wherein the rotor laminations are the aforementioned rotor laminations.

[0053] Finally, an embodiment of this utility model 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 this utility model with the permanent magnet motor (original scheme) in related technologies. Figure 8 This is a comparative schematic diagram showing the electromagnetic noise of embodiments of the permanent magnet motor of this utility model (Scheme 1 and Scheme 2) and a permanent magnet motor in related technologies (original scheme). From Figure 7It can be seen from the above description that the embodiment (scheme one and scheme two) of the permanent magnet motor of the utility model compared with the permanent magnet motor (original scheme) in the related art, the harmonic content and the harmonic distortion rate are obviously reduced, it can be seen that the harmonic is obviously reduced, and it has positive significance for improving the vibration and noise of the permanent magnet motor. Figure 8 It can be seen from the above description that the embodiment (scheme one and scheme two) of the permanent magnet motor of the utility model compared with the permanent magnet motor (original scheme) in the related art, the electromagnetic noise is obviously reduced.

[0056] From the above description, it can be seen that the above-mentioned embodiment of the utility model realizes the following technical effects:

[0057] The rotor punching sheet of the embodiment of the utility model is provided with: a plurality of magnetic steel grooves 1, the plurality of magnetic steel grooves 1 are sequentially and spacedly arranged along the circumference of the rotor punching sheet; a plurality of magnetic flux guiding groove groups 2, each magnetic flux guiding groove group 2 includes one or more magnetic flux guiding grooves 21, for any one magnetic flux guiding groove group 2, it is located between the corresponding magnetic steel groove 1 and the edge of the rotor punching sheet; wherein the magnetic flux guiding groove 21 includes a first groove section 211 and a second groove section 212, the first groove section 211 is arranged in extension along the circumference of the rotor punching sheet, the extension direction of the second groove section 212 forms a preset angle with the radial direction of the rotor punching sheet, and the preset angle is in the range of 0° to 15°. The rotor punching sheet with this structure design is provided with the magnetic flux guiding groove group 2, the magnetic flux guiding groove group 2 includes at least one magnetic flux guiding groove 21, the magnetic flux guiding groove 21 is designed as a special structure, specifically, it includes the first groove section 211 and the second groove section 212, the first groove section 211 is arranged in extension along the circumference of the rotor punching sheet, which can guide the stator armature magnetic field, effectively reduce the harmonic of the stator armature magnetic field, and the extension direction of the second groove section 212 forms an angle of 0° to 15° with the radial direction of the rotor punching sheet, that is, the second groove section 212 can be a structure extending along the radial direction of the rotor punching sheet, or can be a structure inclined to the radial direction of the rotor punching sheet, and the angle of inclination is less than or equal to 15°, the second groove section 212 can guide the rotor permanent magnet magnetic field, weaken the rotor permanent magnet magnetic field harmonic, by combining the design of the above-mentioned first groove section 211 and the above-mentioned second groove section 212, the effect of arranging and optimizing the magnetic field magnetic force line of the motor is achieved, the distribution of the disordered magnetic field is reduced, the harmonic content of the magnetic field of the stator-rotor air gap can be effectively reduced, thereby being beneficial to reducing the vibration and noise of the permanent magnet motor, and solving the technical problem of large vibration and noise of the permanent magnet motor in the related art.

[0058] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical" and "horizontal" as can be perceived herein relative to the accompanying drawings refer to the orientation of the components being described. However, it is to be understood that the exemplary embodiments described herein can assume different alternative orientations, except where expressly specified to the contrary. It is also to be understood that the specific devices illustrated in the attached drawings, and described in the following specification are exemplary embodiments only and should not be typically construed as limiting the scope of the present application.

[0059] It is also important to note that the term "or" as used herein is intended to mean any possible combination of the features, steps or elements it modifies, including one as well as one or more. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0060] It is to be understood that the terminology used herein is for the purpose of describing the exemplary embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0061] The preferred embodiments of the present application have been described herein above with the intent of illustrating the principles of operation of the application by reference to one or more preferred embodiments. Any change in making materials or changes in the order of any steps are considered to be within the scope of the present application.

Claims

1. A rotor lamination, characterized by The rotor lamination is provided with: a plurality of magnetic steel grooves (1), a plurality of the magnetic steel grooves (1) are sequentially and spaced apart along the circumference of the rotor lamination; a plurality of magnetic flux guiding groove groups (2), each of the magnetic flux guiding groove groups (2) comprises one or more magnetic flux guiding grooves (21), for any one of the magnetic flux guiding groove groups (2), it is located between the corresponding magnetic steel groove (1) and the edge of the rotor lamination; wherein the magnetic flux guiding groove (21) comprises a first groove section (211) and a second groove section (212), the first groove section (211) is arranged along the circumferential direction of the rotor lamination, the extension direction of the second groove section (212) forms a preset angle with the radial direction of the rotor lamination, and the preset angle is in the range of 0° to 15°.

2. The rotor lamination of claim 1, wherein, For any one of the magnetic flux guiding grooves (21), the distance from the first groove section (211) to the edge of the rotor lamination is less than the distance from the second groove section (212) to the edge of the rotor lamination.

3. The rotor lamination of claim 2, wherein, For any one of the magnetic flux guiding grooves (21), the first groove section (211) and the second groove section (212) are spaced apart along the radial direction of the rotor lamination; or for any one of the magnetic flux guiding grooves (21), the first groove section (211) and the second groove section (212) are in communication.

4. The rotor lamination of claim 2, wherein, For any one of the magnetic flux guiding grooves (21), the first groove section (211) and the second groove section (212) are sequentially arranged along the circumferential direction of the rotor lamination.

5. The rotor lamination of claim 1, wherein, For any one of the magnetic flux guiding grooves (21), the maximum size of the first groove section (211) along the circumferential direction of the rotor lamination is greater than the maximum size of the second groove section (212) along the circumferential direction of the rotor lamination.

6. The rotor lamination of any of claims 1-5, wherein, In the case where the magnetic flux guiding groove group (2) comprises a plurality of magnetic flux guiding grooves (21), a plurality of the magnetic flux guiding grooves (21) are sequentially and spaced apart along the circumference of the rotor lamination.

7. The rotor lamination of claim 6, wherein, The structure of the rotor lamination satisfies d2 / d1>1.5, d4 / d3>2, wherein d2 is the maximum size of the first groove section (211) of the first guiding groove along the circumferential direction of the rotor lamination, d1 is the maximum size of the second groove section (212) of the first guiding groove along the circumferential direction of the rotor lamination, d4 is the maximum size of the first groove section (211) of the second guiding groove along the circumferential direction of the rotor lamination, and d3 is the maximum size of the second groove section (212) of the second guiding groove along the circumferential direction of the rotor lamination, the first guiding groove is the magnetic flux guiding groove (21) located at the end in a single magnetic flux guiding groove group (2), and the second guiding groove is the magnetic flux guiding groove (21) adjacent to the first guiding groove in the same magnetic flux guiding groove group (2).

8. The rotor lamination of claim 6, wherein, A plurality of the magnetic flux guiding grooves (21) belonging to the same magnetic flux guiding groove group (2) are symmetrically arranged relative to a preset axis, and the preset axis is the symmetry axis of the magnetic steel groove (1) corresponding to the magnetic flux guiding groove group (2).

9. The rotor lamination of claim 6, wherein, For a plurality of the 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 section (212) of the plurality of the magnetic flux guide grooves (21) gradually increases along the extension direction of the second groove section (212), 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 of claim 1, wherein, The number of the magnetic flux guide groove groups (2) is the same as the number of the magnetic steel grooves (1), and a plurality of the magnetic flux guide groove groups (2) correspond one by one to a plurality of the magnetic steel grooves (1).

11. A rotor structure, characterized by The rotor structure comprises a plurality of rotor laminations stacked in sequence, wherein the rotor laminations are the rotor laminations of any one of claims 1 to 10.

12. A permanent magnet electric machine characterized by, The permanent magnet motor comprises a rotor structure (10) and a stator structure (20), wherein the rotor structure is the rotor structure of claim 11. The permanent magnet motor comprises a rotor structure (10) and a stator structure (20), wherein the rotor structure is the rotor structure of claim 11.

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