CN212343465U - Rotor structure and motor with same - Google Patents

Abstract

The utility model provides a rotor structure and have its motor. The rotor structure comprises a rotor core, the rotor core comprises at least one first punching sheet group and a plurality of second punching sheet groups, and the plurality of second punching sheet groups and the first punching sheet groups are arranged in a staggered and laminated mode along the axial direction of the rotor core; the first punching sheet group comprises at least one first punching sheet, the first punching sheet comprises a plurality of first outer rotor punching sheets and a first inner rotor punching sheet, the first outer rotor punching sheets are arranged at intervals along the circumferential direction of the first inner rotor punching sheet, each first outer rotor punching sheet is arranged at a distance from the first inner rotor punching sheet, and a first mounting groove for mounting magnetic steel is formed between every two adjacent first outer rotor punching sheets. The first outer rotor punching sheet of the first punching sheet group is arranged to be arranged at a distance from the first inner rotor punching sheet, so that the situation of magnetic leakage generated in the first punching sheet group can be avoided, the integral magnetic leakage quantity of the rotor core is reduced, and the efficiency of the motor is effectively improved.

Description

Rotor structure and motor with same

Technical Field

The utility model relates to an electrical equipment technical field particularly, relates to a rotor structure and have its motor.

Background

Along with the rapid development of the permanent magnet motor technology, the permanent magnet motor is more and more emphasized by people, and compared with other motors such as the traditional electrically excited motor, the permanent magnet motor has the advantages of high output density, high efficiency, convenience in maintenance, simple structure and the like. In the permanent magnet motor, in order to promote the performance of the motor, the motor is required to obtain better magnetic performance generally, and in several common structures, a surface-mounted rotor and an embedded radial rotor are compared, so that the magnetic flux area can be effectively increased by a built-in tangential rotor structure, the effective air gap magnetic flux is improved, and the performance of the motor is further promoted.

Traditional embedded rotor punching, outer magnetism bridge and interior magnetism bridge of separating all are connection structure, link whole rotor punching as a whole, form the magnet steel groove in a plurality of grooves in the centre, and the magnet steel inserts in the magnet steel groove and fixes through glue, forms final rotor. Although the rotor structure and the production process are simple, magnetic flux leakage is serious, the performance of the magnetic steel cannot be fully exerted, then the form of adhering the magnetic steel by using artificial glue is adopted, the glue amount is not controllable, the glue can be failed under the high-temperature condition, the magnetic steel falls off, and the reliability of the motor is lowered.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a rotor structure and a motor having the same, so as to solve the problem of magnetic leakage of the motor in the prior art.

In order to achieve the above object, according to an aspect of the present invention, there is provided a rotor structure including: the rotor core comprises at least one first punching sheet group and a plurality of second punching sheet groups, and the plurality of second punching sheet groups and the first punching sheet groups are arranged in a staggered and laminated mode along the axial direction of the rotor core; the first punching sheet group comprises at least one first punching sheet, the first punching sheet comprises a plurality of first outer rotor punching sheets and a first inner rotor punching sheet, the first outer rotor punching sheets are arranged at intervals along the circumferential direction of the first inner rotor punching sheet, each first outer rotor punching sheet is arranged at a distance from the first inner rotor punching sheet, and a first mounting groove for mounting magnetic steel is formed between every two adjacent first outer rotor punching sheets.

Furthermore, the second punching sheet group comprises at least one second punching sheet, the second punching sheet comprises a plurality of second outer rotor punching sheets and a second inner rotor punching sheet, the plurality of second outer rotor punching sheets are arranged at intervals along the circumferential direction of the second inner rotor punching sheet, each second outer rotor punching sheet is connected with the second inner rotor punching sheet in a grounded manner, a second mounting groove for mounting magnetic steel is formed between the adjacent second outer rotor punching sheets, and the second mounting groove and the first mounting groove are arranged oppositely and in a communicated manner in the axial direction of the rotor core.

Furthermore, one of the second punching sheet groups forms a first end of the rotor core, the other of the second punching sheet groups forms a second end of the rotor core, and the first punching sheet group is located between the first end of the rotor core and the second end of the rotor core.

Furthermore, the number of the first punching sheet groups is multiple, the multiple first punching sheet groups and the multiple second punching sheet groups are alternately arranged, and the number of the first punching sheets in at least one of the multiple first punching sheet groups is greater than that of the second punching sheets in the second punching sheet group.

Furthermore, the number of the second punching sheets of the second punching sheet group positioned at the first end of the rotor core is one, and the number of the second punching sheets of the second punching sheet group positioned at the second end of the rotor core is one.

Furthermore, the number of the second punching sheets of the second punching sheet groups is one.

Furthermore, a plurality of first injection molding holes are formed in the first inner rotor punching sheet and are arranged at intervals along the circumferential direction of the first inner rotor punching sheet, a plurality of second injection molding holes are formed in the second inner rotor punching sheet and are arranged at intervals along the circumferential direction of the second inner rotor punching sheet, and the first injection molding holes and the second injection molding holes are arranged in a one-to-one correspondence mode.

Furthermore, a plurality of first buckling points are arranged on the first inner rotor punching sheet, the first buckling points are arranged at intervals along the circumferential direction of the first inner rotor punching sheet, the first buckling points and the first injection molding holes are alternately arranged along the circumferential direction of the first inner rotor punching sheet, and/or a plurality of second buckling points are arranged on the second inner rotor punching sheet, the second buckling points are arranged at intervals along the circumferential direction of the second inner rotor punching sheet, and the second buckling points and the second injection molding holes are alternately arranged along the circumferential direction of the first inner rotor punching sheet.

Furthermore, one part of the first outer rotor punching sheets is provided with a third injection molding hole, the other part of the first outer rotor punching sheets is provided with a first positioning hole, and the first outer rotor punching sheets provided with the first positioning holes and the first outer rotor punching sheets provided with the third injection molding holes are alternately arranged.

Furthermore, one part of the second outer rotor punching sheets is provided with a fourth injection molding hole, the other part of the second outer rotor punching sheets is provided with a second positioning hole, the second outer rotor punching sheets provided with the second positioning holes and the second outer rotor punching sheets provided with the fourth injection molding holes are alternately arranged, the second positioning holes and the first positioning holes are coaxially arranged, and the fourth injection molding holes and the third injection molding holes are coaxially arranged.

Furthermore, the outer peripheral face of the first inner rotor punching sheet is provided with a plurality of first limiting bulges, the first limiting bulges are arranged at intervals along the circumferential direction of the first inner rotor punching sheet, and the first limiting bulges are abutted to the end portions of the magnetic steel.

Furthermore, injection molding parts are filled between the adjacent first limiting bulges and the opposite magnetic steel and first outer rotor punching sheets.

Further, the distance is arranged between two adjacent first outer rotor punching sheets, and/or the distance is arranged at one end, far away from the second inner rotor punching sheet, of the adjacent second outer rotor punching sheet.

According to another aspect of the present invention, there is provided a motor, including a rotor structure, the rotor structure is the above-mentioned rotor structure.

Use the technical scheme of the utility model, with the first external rotor towards the piece of first towards piece group set to have the distance ground setting mode with first inner rotor towards the piece, set up the condition that can avoid producing the magnetic leakage in first towards piece group like this, reduced rotor core's whole magnetic leakage volume then, improved the efficiency of motor effectively.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of an embodiment of a first punching sheet group according to the invention;

fig. 2 shows a schematic structural view of an embodiment of a second punching sheet set according to the invention;

fig. 3 shows an exploded structural schematic view of an embodiment of a rotor structure according to the invention;

fig. 4 shows a schematic structural view of a first embodiment of a rotor structure according to the invention;

FIG. 5 is a schematic sectional view taken along line A-A in FIG. 4;

fig. 6 shows a schematic structural view of a second embodiment of a rotor structure according to the invention;

fig. 7 is a schematic sectional view along direction B-B in fig. 6.

Wherein the figures include the following reference numerals:

10. a rotor core; 11. a first punching sheet group; 111. a first punching sheet; 1111. a first outer rotor punching sheet; 1112. a first inner rotor punching sheet; 112. a first mounting groove;

12. a second punching sheet group; 121. a second punching sheet; 1211. a second outer rotor sheet; 1212. a second inner rotor punching sheet; 122. a second mounting groove;

20. magnetic steel;

31. a first injection molding hole; 32. a second injection molding hole; 33. a third injection molding hole; 34. a fourth injection molding hole;

41. a first buckling point; 42. a second fastening point;

51. a first positioning hole; 52. a second positioning hole; 53. a first limit protrusion; 54. and a second limiting bulge.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.

Referring to fig. 1 to 7, according to an embodiment of the present application, a rotor structure is provided.

The rotor structure includes a rotor core 10. The rotor core 10 includes at least one first punching sheet group 11 and a plurality of second punching sheet groups 12. The plurality of second punching blade groups 12 and the first punching blade groups 11 are stacked in a staggered manner in the axial direction of the rotor core 10. The first punching sheet set 11 includes at least one first punching sheet 111, and the first punching sheet 111 includes a plurality of first outer rotor punching sheets 1111 and one first inner rotor punching sheet 1112. The plurality of first outer rotor punching sheets 1111 are arranged at intervals along the circumferential direction of the first inner rotor punching sheet 1112. Each first outer rotor punching 1111 is disposed at a distance from the first inner rotor punching 1112. A first mounting groove 112 for mounting the magnetic steel 20 is formed between the adjacent first outer rotor punching sheets 1111.

In this embodiment, the first outer rotor punching sheet of the first punching sheet set 11 is set to have a distance from the first inner rotor punching sheet 1112, so that the situation of magnetic flux leakage generated in the first punching sheet set 11 can be avoided, the overall magnetic flux leakage of the rotor core is reduced, and the efficiency of the motor is effectively improved.

The second punching sheet group 12 includes at least one second punching sheet 121. The second punching sheet 121 includes a plurality of second outer rotor punching sheets 1211 and a second inner rotor punching sheet 1212. The plurality of second outer rotor punching sheets 1211 are arranged at intervals along the circumferential direction of the second inner rotor punching sheet 1212, each second outer rotor punching sheet 1211 is connected with the second inner rotor punching sheet 1212 and is grounded, a second mounting groove 122 for mounting the magnetic steel 20 is formed between the adjacent second outer rotor punching sheets 1211, and the second mounting groove 122 and the first mounting groove 112 are arranged in the axial direction of the rotor core 10 in an opposite and communicated manner. Through designing two kinds of rotor punching, the second is towards the complete disconnection of magnetic bridge outside the piece and is that each outer rotor punching is single individuality, the inboard of second punching is separated the magnetic bridge and is connected completely (as shown in A department in fig. 2), the complete disconnection of magnetic bridge is separated outward to first punching, the inboard of first punching is separated the magnetic bridge and is also all disconnected (as shown in D department in fig. 1) and do not have inboard to separate the magnetic bridge promptly, two kinds of axial intervals are folded and are pressed and form rotor core, because the disconnection that separates the magnetic bridge, rotor core's magnetic leakage can be less by a wide margin, the corresponding rotor magnetic field can corresponding reinforcing, the power density of motor also can correspond the improvement. The injection molding grooves are formed at the disconnected positions of the outer magnetic isolation bridges (as shown in a position B in fig. 2 and a position E in fig. 6), injection molding holes are reserved on the outer rotor core and the inner rotor core, the magnetic steel is fixed without glue when being inserted into the magnetic steel grooves formed by the first mounting groove 112 and the second mounting groove 122, the iron core and the magnetic steel are injected into a whole through later-stage injection molding materials, the process consistency is good, the strength is high, and the motor runs reliably.

As shown in fig. 3, one of the second punching blade groups 12 forms a first end of the rotor core 10, another one of the second punching blade groups 12 forms a second end of the rotor core 10, and the first punching blade group 11 is located between the first end of the rotor core 10 and the second end of the rotor core 10. The second punching sheet group 12 with the inner magnetic isolation bridge is arranged at the end part of the rotor core, so that the overall strength of the rotor structure can be effectively improved.

The number of the first punching sheet groups 11 is multiple, the multiple first punching sheet groups 11 and the multiple second punching sheet groups 12 are alternately arranged, and the number of the first punching sheets 111 in at least one of the multiple first punching sheet groups 11 is greater than the number of the second punching sheets 121 in the second punching sheet group 12. The magnetic leakage of the rotor core can be reduced by the arrangement, and the efficiency of the motor is improved.

In one embodiment of the present application, the number of the second punching sheets 121 of the second punching sheet group 12 located at the first end of the rotor core 10 is one, and the number of the second punching sheets 121 of the second punching sheet group 12 located at the second end of the rotor core 10 is one. The arrangement can minimize the magnetic leakage of the motor and maximize the efficiency of the motor. Of course, the number of the second punching sheets 121 of the plurality of second punching sheet groups 12 may be one.

As shown in fig. 1, the first inner rotor punching sheet 1112 is provided with a plurality of first injection holes 31. A plurality of first injection holes 31 are provided at intervals along the circumferential direction of the first inner rotor lamination 1112. As shown in fig. 2, a plurality of second injection holes 32 are provided on the second inner rotor punching sheet 1212. The plurality of second injection molding holes 32 are arranged along the circumferential direction of the second inner rotor stamped piece 1212 at intervals, and the plurality of first injection molding holes 31 and the plurality of second injection molding holes 32 are arranged in a one-to-one correspondence manner. The rotor structure can be connected into a whole through the first injection molding hole 31 and the second injection molding hole 32 in the injection molding process of the rotor structure.

As shown in fig. 1 and 2, a plurality of first fastening points 41 are disposed on the first inner rotor punching sheet 1112. The plurality of first fastening points 41 are arranged along the circumferential direction of the first inner rotor punching sheet 1112 at intervals, and the plurality of first fastening points 41 and the plurality of first injection holes 31 are alternately arranged along the circumferential direction of the first inner rotor punching sheet 1112. A plurality of second buckling points 42 are arranged on the second inner rotor punching sheet 1212. The plurality of second fastening points 42 are arranged at intervals along the circumferential direction of the second inner rotor punching sheet 1212, and the plurality of second fastening points 42 and the plurality of second injection molding holes 32 are alternately arranged along the circumferential direction of the first inner rotor punching sheet 1112. The arrangement can conveniently fold and press each inner rotor iron core, and the connection reliability of the rotor iron cores is improved.

In order to further improve the reliability of the rotor structure, one part of the first outer rotor punching sheets 1111 is provided with a third injection molding hole 33, the other part of the first outer rotor punching sheets 1111 is provided with a first positioning hole 51, and the first outer rotor punching sheets 1111 provided with the first positioning hole 51 and the first outer rotor punching sheets 1111 provided with the third injection molding hole 33 are alternately arranged. One of the second outer rotor sheets 1211 is provided with a fourth injection hole 34, the other second outer rotor sheet 1211 is provided with a second positioning hole 52, the second outer rotor sheets 1211 provided with the second positioning hole 52 and the second outer rotor sheets 1211 provided with the fourth injection hole 34 are alternately arranged, the second positioning hole 52 is coaxially arranged with the first positioning hole 51, and the fourth injection hole 34 is coaxially arranged with the third injection hole 33.

The outer peripheral surface of the first inner rotor punching sheet 1112 is provided with a plurality of first limiting protrusions 53, the plurality of first limiting protrusions 53 are arranged at intervals along the circumferential direction of the first inner rotor punching sheet 1112, and the plurality of first limiting protrusions 53 are abutted to the end of the magnetic steel 20. The magnetic steel installation stability can be improved by the arrangement. The second inner rotor punching sheet is provided with second limiting protrusions 54 corresponding to the first limiting protrusions 53 one to one. The stability of magnet steel can further be improved to this setting.

Injection molding parts 60 are filled between the adjacent first limiting protrusions 53 and the opposite magnetic steel 20 and the first outer rotor punching sheet 1111. The arrangement can avoid magnetic leakage between adjacent magnetic poles.

In this application, two adjacent first outer rotor punching sheets 1111 are arranged with a distance therebetween, and one end of the adjacent second outer rotor punching sheet 1211, which is far away from the second inner rotor punching sheet 1212, is arranged with a distance therebetween. The arrangement can reduce the material used by the rotor core and reduce the production cost of the rotor core.

The rotor structure in the above-mentioned embodiment can also be used for electrical equipment technical field, promptly according to the utility model discloses an on the other hand provides a motor, including rotor structure, rotor structure is the rotor structure in the above-mentioned embodiment.

Specifically, the rotor core is formed by axially laminating a second punching sheet and a first punching sheet at an interval, the outer magnetic isolation bridge of the second punching sheet is of a full-disconnection structure, the inner magnetic isolation bridge of the first punching sheet is of a full-connection structure, the outer magnetic isolation bridge of the first punching sheet is of a full-disconnection structure, and the inner side of the first punching sheet is not provided with a magnetic isolation bridge structure. And the outer side magnetic isolation bridge of the second punching sheet and the first punching sheet is provided with an injection molding groove at the disconnection position, injection molding holes are formed in the outer rotor iron core and the inner rotor iron core, and the magnetic steel is inserted into the magnetic steel groove and then is injected into the iron core and the magnetic steel into a whole by using injection molding materials, so that the plastic-coated rotor with high power density and high reliability is formed.

As shown in fig. 2, the outer magnetic isolation bridge of the bridge punching sheet is of a full-disconnection structure, the inner magnetic isolation bridge is of a full-connection structure, the rotor punching sheet is an integral body, each fan-shaped punching sheet of the outer ring is provided with a square self-buckling wedge (as shown in C in fig. 2) and a through hole, and the inner ring is punched with a through hole and a circular buckling point. The square self-buckling wedge has the effects that the outer ring punching sheets are connected into a whole through overlying, and the circular buckling point has the effects that the inner ring punching sheets are connected into a whole through overlying. The outer ring through holes can realize two functions, wherein one half of the through holes are positioning holes for positioning and using during subsequent injection molding and magnetization, and the other half of the through holes are injection molding holes, namely fourth injection molding holes, for subsequent filling of plastic package materials, so that the connection strength of the whole plastic-coated rotor is improved. The self-fastening wedges, fastening points and through holes shown in fig. 2 are all uniformly distributed on the rotor punching sheet, and the number and the shape shown in the figure are only used as reference and can be adjusted according to actual use and production requirements.

As shown in fig. 1, the outer magnetic isolation bridge of the first punching sheet is of a full-break structure, the inner side of the first punching sheet is not provided with a magnetic isolation bridge structure, the first punching sheet is of a block structure, each fan-shaped punching sheet of the outer ring of the first punching sheet is provided with a square self-buckling wedge and a through hole, and the inner ring is provided with a through hole and a circular buckling point. First towards the piece and the contrast of second towards the piece, only inboard magnetic bridge department structure is different, and the accessible increases the mold insert realization on same pair mould, need not additionally to open system punch press mould.

As shown in fig. 3 to 5, at least one second punching sheet is arranged on the front end surface and the rear end surface of the rotor core, and the middle of the rotor core is formed by laminating a plurality of first punching sheets at intervals.

As shown in fig. 6 and 7, after the rotor core is formed by stacking the punching sheets, the punching sheets are fixed on an injection mold through a positioning hole of the outer ring, magnetic steel is inserted into a corresponding magnetic steel groove, then injection molding is performed by using a plastic package material, the injection molding groove and the injection molding hole reserved on the core are filled with the plastic package material, and the magnetic steel and the rotor core are connected into a whole to form the final plastic-coated rotor.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (14)

1. A rotor structure, comprising:

the rotor core (10) comprises at least one first punching sheet group (11) and a plurality of second punching sheet groups (12), and the second punching sheet groups (12) and the first punching sheet groups (11) are arranged in a staggered and laminated mode along the axial direction of the rotor core (10);

the first punching sheet group (11) comprises at least one first punching sheet (111), the first punching sheet (111) comprises a plurality of first outer rotor punching sheets (1111) and one first inner rotor punching sheet (1112), the first outer rotor punching sheets (1111) are arranged along the circumferential direction of the first inner rotor punching sheet (1112) at intervals, each first outer rotor punching sheet (1111) and the first inner rotor punching sheet (1112) are arranged at intervals, and a first mounting groove (112) for mounting magnetic steel (20) is formed between the adjacent first outer rotor punching sheets (1111).

2. The rotor structure of claim 1,

the second punching sheet group (12) comprises at least one second punching sheet (121), the second punching sheet (121) comprises a plurality of second outer rotor punching sheets (1211) and one second inner rotor punching sheet (1212), the second outer rotor punching sheets (1211) are arranged along the circumferential interval of the second inner rotor punching sheet (1212), each second outer rotor punching sheet (1211) is connected with the second inner rotor punching sheet (1212) in a grounding manner, a second mounting groove (122) for mounting the magnetic steel (20) is formed between the adjacent second outer rotor punching sheets (1211), and the second mounting groove (122) and the first mounting groove (112) are arranged in a manner that the axial direction of the rotor iron core (10) is opposite to each other and is communicated with each other.

3. A rotor structure according to claim 2, characterized in that one of the second plurality of punching blade sets (12) forms a first end of the rotor core (10) and another of the second plurality of punching blade sets (12) forms a second end of the rotor core (10), the first punching blade set (11) being located between the first end of the rotor core (10) and the second end of the rotor core (10).

4. The rotor structure according to claim 2 or 3, wherein the first punching sheet group (11) is a plurality of punching sheets, the first punching sheet groups (11) and the second punching sheet groups (12) are alternately arranged, and the number of the first punching sheets (111) in at least one of the first punching sheet groups (11) is greater than the number of the second punching sheets (121) in the second punching sheet group (12).

5. A rotor structure according to claim 3, characterized in that the number of the second punching sheets (121) of the second punching sheet group (12) located at the first end of the rotor core (10) is one, and the number of the second punching sheets (121) of the second punching sheet group (12) located at the second end of the rotor core (10) is one.

6. The rotor structure according to claim 2, characterized in that the number of the second punching sheets (121) of the second punching sheet group (12) is one.

7. The rotor structure according to claim 2, characterized in that a plurality of first injection holes (31) are provided on the first inner rotor lamination (1112), a plurality of the first injection holes (31) are provided at intervals along the circumferential direction of the first inner rotor lamination (1112), a plurality of second injection holes (32) are provided on the second inner rotor lamination (1212), a plurality of the second injection holes (32) are provided at intervals along the circumferential direction of the second inner rotor lamination (1212), and a plurality of the first injection holes (31) and a plurality of the second injection holes (32) are provided in one-to-one correspondence.

8. The rotor structure of claim 7, characterized in that a plurality of first fastening points (41) are disposed on the first inner rotor lamination (1112), a plurality of the first fastening points (41) are disposed at intervals along a circumferential direction of the first inner rotor lamination (1112), and a plurality of the first fastening points (41) and a plurality of the first injection holes (31) are alternately disposed along the circumferential direction of the first inner rotor lamination (1112), and/or a plurality of second fastening points (42) are disposed on the second inner rotor lamination (1212), a plurality of the second fastening points (42) are disposed at intervals along the circumferential direction of the second inner rotor lamination (1212), and a plurality of the second fastening points (42) and a plurality of the second injection holes (32) are alternately disposed along the circumferential direction of the first inner rotor lamination (1112).

9. The rotor structure according to claim 2, wherein a portion of the first outer rotor punching sheets (1111) is provided with a third injection molding hole (33), and another portion of the first outer rotor punching sheets (1111) is provided with a first positioning hole (51), and the first outer rotor punching sheets (1111) provided with the first positioning hole (51) and the first outer rotor punching sheets (1111) provided with the third injection molding hole (33) are alternately arranged.

10. The rotor structure according to claim 9, wherein a portion of the second outer rotor lamination sheets (1211) is provided with a fourth injection hole (34), another portion of the second outer rotor lamination sheets (1211) is provided with a second positioning hole (52), the second outer rotor lamination sheets (1211) provided with the second positioning hole (52) are alternately arranged with the second outer rotor lamination sheets (1211) provided with the fourth injection hole (34), the second positioning hole (52) is coaxially arranged with the first positioning hole (51), and the fourth injection hole (34) is coaxially arranged with the third injection hole (33).

11. The rotor structure according to claim 2, characterized in that the outer peripheral surface of the first inner rotor punching sheet (1112) is provided with a plurality of first limiting protrusions (53), the plurality of first limiting protrusions (53) are arranged at intervals along the circumferential direction of the first inner rotor punching sheet (1112), and the plurality of first limiting protrusions (53) are abutted against the end of the magnetic steel (20).

12. The rotor structure according to claim 11, characterized in that injection molded parts (60) are filled between the adjacent first limiting protrusions (53) and the opposite magnetic steel (20) and first outer rotor punching sheet (1111).

13. The rotor structure according to claim 2, characterized in that two adjacent first outer rotor sheets (1111) are arranged with a distance therebetween, and/or one end of the adjacent second outer rotor sheet (1211) far away from the second inner rotor sheet (1212) is arranged with a distance therebetween.

14. An electrical machine comprising a rotor structure, characterized in that the rotor structure is a rotor structure according to any one of claims 1 to 13.

Images