CN216929717U - Rotor structure and motor formed by same - Google Patents

Abstract

The utility model discloses a rotor structure, which comprises a rotor inner iron core and a plurality of rotor outer iron cores, wherein the rotor outer iron core comprises at least two triangular punching sheets and at least one convex punching sheet which are overlapped together, the outer ends of the triangular punching sheets and the convex punching sheets are the same circular arcs, and a connecting line between the outer ends and the inner ends of the triangular punching sheets is a straight line; bulges are symmetrically arranged on the connecting line of the two sides of the outer end and the inner end of the bulge stamped sheet, and the radial size of each bulge is smaller than that of the outer end in the bulge stamped sheet; and a mounting groove for mounting the magnetic shoe is formed between the two adjacent rotor outer iron cores, and the outer end of the magnetic shoe is abutted to the protrusion. The utility model provides a rotor structure and a motor formed by the same, which effectively increase the radial width and circumferential length increase of injection molding framework ribs; meanwhile, the contact area between the injection molding framework rib and the upper end surface and the lower end surface of the rotor structure is increased, so that the strength of the injection molding framework rib is further increased.

Description

Rotor structure and motor formed by same

Technical Field

The utility model relates to the field of motor equipment, in particular to a rotor structure and a motor formed by the same.

Background

In order to improve the magnetic performance of the motor, a fully-separated embedded rotor core structure is produced. The fully-separated embedded rotor core is surrounded by a plurality of rotor outer cores, and a magnetic shoe is arranged between each rotor outer core. Fig. 1 is a schematic diagram of a conventional rotor outer core, which is formed by stacking a plurality of rotor outer core laminations shown in fig. 2; the plurality of rotor outer cores are distributed along the circumferential direction of the rotor inner core, and after the positions of the rotor outer core 11, the rotor inner core 12 and the magnetic shoes 13 are determined, the rotor structure shown in fig. 3 is formed through injection molding. Wherein, FIG. 4 is a schematic view of an injection molding framework.

The existing rotor magnetizing process comprises a first magnetizing process and a second magnetizing process; if a first magnetizing process is adopted, namely the magnetic shoe is magnetized first to distinguish N/S poles, the polarity of the magnetic shoe needs to be distinguished from N-S-N-S … … when the magnetic shoe is assembled in the injection molding process of the rotor, and therefore the efficiency of the magnetic shoe installation process is low. Therefore, in the prior art, a post-magnetizing process is preferably considered, and in the existing rotor structure, as shown in fig. 1 to 4, in the injection molding process, injection molding material filled in the gap between the adjacent rotor outer core 11 and the magnetic shoe 13 therebetween forms an injection molding framework rib 14, as shown in fig. 3, because the outermost end of the rotor outer core stamped sheet is provided with a T-shaped protrusion, the outermost end of the injection molding framework rib protrudes out of the rotor outer core, so that in the finally formed rotor structure, the upper end and the lower end of the injection molding framework rib cannot be completely overlapped with the upper end and the lower end of the rotor structure in the axial direction, that is, a step is formed between the upper end and the lower end of the rotor structure and the injection molding framework rib, as shown in a in fig. 4. Because the step exists, the contact area between the injection molding framework rib and the upper end surface and the lower end surface of the rotor structure is smaller, and the problem that the upper end and the lower end of the injection molding framework rib are broken easily occurs in the subsequent magnetizing process.

Meanwhile, as shown in the attached figures 3-4, the T-shaped bulges compress the circumferential width of the injection molding framework ribs, so that the radial width and the circumferential length of the injection molding framework ribs are smaller, and further the fastening force of the injection molding framework ribs to the rotor outer iron core stamped sheet is smaller; the phenomenon that the rotor injection molding framework rib is broken easily occurs in the rotor magnetizing process. If the injection molding framework rib is broken, the magnetic shoe is moved outwards to damage the rotor structure.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving, at least to some extent, one of the problems in the related art. Therefore, the utility model aims to provide a rotor structure and a motor formed by the same, wherein the radial width and the circumferential length of an injection molding framework rib are effectively increased by changing the shape of a punching sheet in an outer iron core of a rotor; meanwhile, the contact area between the injection molding framework rib and the upper end surface and the lower end surface of the rotor structure is increased, so that the strength of the injection molding framework rib is further increased.

In order to achieve the above object, the present invention provides a rotor structure comprising

The rotor comprises a rotor inner iron core and a plurality of rotor outer iron cores, wherein the plurality of rotor outer iron cores are arranged at intervals along the circumferential direction of the rotor inner iron core;

the outer iron core of the rotor comprises at least two triangular punching sheets and at least one convex punching sheet which are superposed together, wherein the ends, far away from the inner iron core of the rotor, of the triangular punching sheets and the convex punching sheets are defined as outer ends, the ends, close to the inner iron core of the rotor, of the triangular punching sheets and the convex punching sheets are defined as inner ends, the outer ends of the triangular punching sheets and the convex punching sheets are identical circular arcs, and a connecting line between the outer ends and the inner ends of the triangular punching sheets is a straight line; bulges are symmetrically arranged on the connecting line of the two sides of the outer end and the inner end of the bulge stamped sheet, and the radial size of each bulge is smaller than that of the outer end in the bulge stamped sheet; and a mounting groove for mounting the magnetic shoe is formed between the two adjacent rotor outer cores, and the outer end of the magnetic shoe is abutted with the bulge.

Furthermore, the upper end and the lower end of the rotor outer iron core are triangular stamped sheets.

Furthermore, the number of the protruding stamped sheets in the rotor outer iron core is N, the N protruding stamped sheets are distributed in a centrosymmetric manner, and the symmetric center is the axial center of the rotor outer iron core; n is an even number greater than 0.

Furthermore, the number of the raised punching sheets in the outer iron core of the rotor is M, and one raised punching sheet is located at the axial center of the outer iron core of the rotor; the rest protruding punching sheets are distributed in a centrosymmetric manner, and the symmetric center is the axial center of the rotor outer iron core; m is an odd number greater than 0.

Further, a gap is formed between the protrusions of the two adjacent rotor outer cores.

Furthermore, the protruding stamped sheet is a T-shaped stamped sheet, a protrusion in the T-shaped stamped sheet is an arc in the radial direction, and the central point of the arc coincides with the central point of an outer end arc in the protruding stamped sheet.

Furthermore, the protruding punching sheet is a convex point punching sheet, and the protrusion in the convex point punching sheet is a convex point.

Furthermore, a plurality of limiting lugs are arranged on the outer peripheral surface of the inner core of the rotor, the limiting lugs are arranged at intervals along the circumferential direction of the inner core of the rotor, and the limiting lugs are abutted with the inner ends of the magnetic shoes.

Further, injection molding parts are filled between the adjacent limiting convex blocks and the corresponding magnetic shoes and the rotor outer iron core; and injection molding pieces between the adjacent rotor outer iron cores and the magnetic shoes positioned in the adjacent rotor outer iron cores are provided with injection molding framework ribs.

A motor comprises a rotor structure, wherein the rotor structure is the rotor structure.

Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:

(1) the radial dimension of bellied radial dimension is less than the radial dimension of outer end in the protruding towards the piece in this application outer iron core of rotor, and moulds plastics the skeleton muscle and form between the outer iron core of rotor of magnetic shoe and its both sides, and the protruding position moves in makes the radial width and the circumference length increase of the skeleton muscle of moulding plastics for the intensity increase of the skeleton muscle of moulding plastics.

(2) According to the rotor outer core, the triangular punching sheets and the protruding punching sheets are overlapped to form the rotor outer core, the triangular punching sheets are arranged at the upper end and the lower end of the rotor outer core, in a finally formed rotor structure, injection molding framework ribs are embedded in the upper end face and the lower end face of the rotor structure, and the outer ends of the injection molding framework ribs are flush with the upper end face and the lower end face of the rotor structure; this has just increased the area of contact of the skeleton muscle of moulding plastics and rotor structure's upper and lower terminal surface for the intensity of the skeleton muscle of moulding plastics further increases.

(3) The method comprises the steps that the protruding stamped steel is arranged in the outer iron core of the rotor, and the protrusions are uniformly distributed in the axial direction of the outer iron core of the rotor; when the rotor is in the process of moulding plastics, the magnetic shoe receives the outside pressure of injection molding material in radial direction, and the arch of being connected with the magnetic shoe looks at can provide even thrust inwards for the magnetic shoe in axial direction, prevents that it from taking place to move outwards in radial direction.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

In the drawings:

FIG. 1 is a schematic view of a prior art outer core of a rotor;

FIG. 2 is a schematic view of a rotor outer core sheet in the prior art;

FIG. 3 is a cross-sectional view of the rotor formed by the outer core of the rotor of FIG. 1;

FIG. 4 is a schematic view of the rotor of FIG. 3 in its entirety;

FIG. 5 is a schematic diagram of a triangular punch in the present application;

FIG. 6 is a schematic view of an injection molded armature of the present application;

FIG. 7 is a schematic view of an injection molded rotor of the present application;

FIG. 8 is a schematic cross-sectional view of an injection molded rotor of the present application;

fig. 9 is a schematic view of an outer core of a rotor in embodiment 1;

FIG. 10 is a schematic view of a bump sheet in example 1;

fig. 11 is a schematic view of an outer core of a rotor in embodiment 2;

FIG. 12 is a schematic view of a bump sheet in embodiment 2;

reference numbers: 11-rotor outer core; 12-rotor inner core; 13-magnetic shoe; 14-injection molding framework ribs; 15-a limit bump; a 16-T shaped projection; 17-bumps.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.

It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the utility model. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

Referring to FIGS. 4-12, a rotor structure is provided according to an embodiment of the present application.

The rotor structure includes a rotor inner core 12 and a plurality of rotor outer cores 11, and the plurality of rotor outer cores 11 are arranged at intervals in the circumferential direction of the rotor inner core 12. Wherein, the inner iron core of the rotor can be an integrally formed structure; a plurality of limiting lugs 15 are arranged on the outer peripheral surface of the rotor inner core 12, the limiting lugs 15 are arranged at intervals along the circumferential direction of the rotor inner core, and the limiting lugs 15 are abutted with the inner ends of the magnetic shoes 13.

The rotor outer iron core comprises at least two triangular punching sheets and at least one convex punching sheet which are overlapped together, wherein one end of each of the triangular punching sheets and the convex punching sheet, which is far away from the rotor inner iron core, is defined as an outer end, one end of each of the triangular punching sheets and the convex punching sheet, which is close to the rotor inner iron core, is defined as an inner end, the outer ends of the triangular punching sheets and the convex punching sheets are identical circular arcs, and a connecting line between the outer end and the inner end of each of the triangular punching sheets is a straight line; the two side connecting lines of the outer end and the inner end of each protruding stamped sheet are symmetrically provided with protrusions, and the radial size of each protrusion is smaller than that of the outer end of each protruding stamped sheet; and a mounting groove for mounting the magnetic shoe is formed between the two adjacent rotor outer cores, and the outer end of the magnetic shoe is abutted with the bulge. Therefore, the inner end of the magnetic shoe is abutted with the limiting lug, and the outer end of the magnetic shoe is abutted with the bulge; the limiting convex block and the protrusion are used for fastening the magnetic tile.

The punching sheet overlapped into the rotor outer iron core in the application comprises two structures, one structure is a triangular punching sheet, and as shown in the attached figure 5, a connecting line between the outer end and the inner end of the triangular punching sheet is a straight line. In another type, there are protruding stamped pieces, for example, as shown in fig. 10 and 12, the connecting lines of the two sides of the outer end and the inner end of the protruding stamped pieces are symmetrically provided with protrusions, and in the rotor structure, the protrusions between the adjacent rotor outer cores do not contact, and a gap is left in the middle.

The number of the protruding punching sheets in the application needs to be determined according to the height of the magnetic shoe, and the protrusions in the protruding punching sheets can abut against the magnetic shoe, so that the outward pressure on the protruding punching sheets in the subsequent magnetizing process is prevented, and the outward moving phenomenon is prevented. Specifically, when the height of the magnetic shoe is lower than a set value, the protruding stamped steel is arranged at the axial center of the outer iron core of the rotor, the magnetic shoe can be fastened only through one protrusion, and at the moment, one protruding stamped steel is located at the axial center of the outer iron core of the rotor. When the height of the magnetic shoe is higher than a set value, a plurality of convex punching sheets can be arranged according to the height of the magnetic shoe, for example, N convex punching sheets are arranged, and N is an even number greater than 0; under the condition, the N protruding punching sheets are distributed in a centrosymmetric mode, and the symmetric center is the axial center of the rotor outer iron core. Then, for example, M protruding punching sheets are arranged, and M is an odd number larger than 0; in this case, one of the protruding punching sheets is located at the axial center of the rotor outer core; the rest protruding punching sheets are distributed in a centrosymmetric mode, and the symmetric center is the axial center of the rotor outer iron core.

With continued reference to fig. 6-8, in the magnetizing process of the present application, the fastening force to the magnetic shoe 13 includes an internal thrust provided by the protrusion and an internal thrust provided by the injection molding framework rib 14, and in the injection molding process, the injection molding material filled in the gap between the adjacent rotor outer core 11 and the magnetic shoe 13 therebetween forms the injection molding framework rib 14. The intensity of the framework muscle of moulding plastics among this application rotor structure compares the intensity of the framework muscle of moulding plastics among the rotor structure of attached 3-4 and has obtained the reinforcing, embodies in following two aspects:

first aspect, the line between triangle towards piece outer end and the inner is the straight line in this application, and bellied radial dimension is less than the radial dimension of outer end in the protruding piece of punching, compares the outer iron core of rotor among the prior art, and the arch of the outer iron core of rotor is located inside the piece in this application, rather than being located towards the piece outer end, and this just makes the radial width and the circumference length increase of the skeleton muscle of moulding plastics for the intensity increase of the skeleton muscle of moulding plastics. As shown in fig. 8, the radial width of the injection molded framework rib refers to B in fig. 8, and the circumferential length refers to a in fig. 8; compare current rotor structure in the attached figure 3, the radial width and the circumference length of this application skeleton muscle of moulding plastics all increase to some extent.

In a second aspect, the upper end and the lower end of the rotor outer core in the application are both triangular stamped sheets without protrusions, and in a finally formed rotor structure, as shown in fig. 6-8, it can be seen that the injection molding framework ribs 14 are embedded inside the upper end face and the lower end face of the rotor structure, and the outer ends of the injection molding framework ribs are flush with the upper end face and the lower end face of the rotor structure, so that the contact area between the injection molding framework ribs and the upper end face and the lower end face of the rotor structure is increased, and the strength of the injection molding framework ribs is further increased.

Through above-mentioned two aspects, not only strengthened the radial width and the circumference length of the skeleton muscle of moulding plastics itself, also strengthened the combined area of terminal surface about skeleton muscle of moulding plastics and the rotor structure for the intensity of the skeleton muscle of moulding plastics has obtained the promotion, and it is unusual to solve behind the rotor to fill magnetism the skeleton muscle of moulding plastics and split or fracture.

Example 1

As shown in fig. 9-10, the outer core of the rotor includes at least two triangular punching sheets and a T-shaped punching sheet which are stacked together, the outer ends of the triangular punching sheets and the T-shaped punching sheet are the same circular arcs, and the connecting line between the outer end and the inner end of the triangular punching sheet is a straight line; t-shaped bulges 16 are symmetrically arranged on the connecting line of the two sides of the outer end and the inner end of the T-shaped stamped sheet, and the radial dimension of the T-shaped bulges 16 is smaller than that of the outer end in the T-shaped stamped sheet; and a mounting groove for mounting the magnetic shoe is formed between two adjacent rotor outer cores, and the outer end of the magnetic shoe is abutted with the T-shaped bulge 16 in the radial direction. The T-shaped punching sheet is located at the axial center of the rotor outer iron core.

In this embodiment, the T-shaped protrusion is an arc in the radial direction, and the center point of the arc coincides with the center point of the outer end arc in the T-shaped stamped sheet. And a gap is reserved between the T-shaped bulges of the two adjacent rotor outer iron cores.

In the magnetization process in this application, including the protruding interior thrust that provides of T type and the interior thrust that the skeleton muscle provided of moulding plastics of fastening force to the magnetic shoe, at the in-process of moulding plastics, the material of moulding plastics that the outer iron core of adjacent rotor and the magnetic shoe space between them department filled forms the skeleton muscle of moulding plastics.

The line between triangle towards piece outer end and the inner is the straight line in this embodiment, and the bellied radial dimension of T type is less than the radial dimension of outer end in the T type towards the piece, compares outer iron core of rotor among the prior art, and the T type arch of outer iron core of rotor is located towards inside the piece in this application, rather than being located towards the piece outer end, and this just makes the radial width and the circumference length increase of the skeleton muscle of moulding plastics for the intensity increase of the skeleton muscle of moulding plastics.

The upper and lower both ends of the outer iron core of rotor are the triangle towards the piece in this embodiment, do not contain the T type arch, and in the rotor structure who finally forms, can see out that the skeleton muscle of moulding plastics is embedded inside terminal surface about the rotor structure, and the terminal surface flushes about the outer end of the skeleton muscle of moulding plastics and the rotor structure, and this has just increased the area of contact of terminal surface about skeleton muscle of moulding plastics and the rotor structure for the intensity of the skeleton muscle of moulding plastics further increases.

Example 2

As shown in fig. 11-12, the outer core of the rotor includes at least two triangular punching sheets and two salient point punching sheets which are overlapped together, the outer ends of the triangular punching sheets and the salient point punching sheets are the same circular arcs, and the connecting line between the outer ends and the inner ends of the triangular punching sheets is a straight line; the salient points 17 are symmetrically arranged on the connecting line of the outer end and the inner end of the salient point stamped sheet, and the radial dimension of the salient points 17 is smaller than that of the outer end in the salient point stamped sheet; an installation groove for installing the magnetic shoe is formed between two adjacent rotor outer cores, and the outer end of the magnetic shoe is abutted with the salient point 17 in the radial direction. The two salient point punching sheets are distributed in a centrosymmetric mode, and the symmetric center is the axial center of the rotor outer iron core.

In the magnetization process in this application, including the inner thrust that the bump provided and the inner thrust that the skeleton muscle provided of moulding plastics to the fastening force of magnetic shoe, at the in-process of moulding plastics, the material of moulding plastics that adjacent outer iron core of rotor and the magnetic shoe space between them department was filled forms the skeleton muscle of moulding plastics.

The line between triangle towards piece outer end and the inner in this embodiment is the straight line, and the radial dimension of bump is less than the radial dimension of bump towards piece inner outer end in the bump towards the piece, compares the outer iron core of rotor among the prior art, and the bump of the outer iron core of rotor is located towards inside the piece in this application, rather than being located towards the piece outer end, and this just makes the radial width and the circumference length increase of the skeleton muscle of moulding plastics for the intensity increase of the skeleton muscle of moulding plastics.

The upper and lower both ends of the outer iron core of rotor are the triangle towards the piece in this embodiment, do not contain the bump, and in the rotor structure of final formation, can see out that the skeleton muscle of moulding plastics is embedded inside terminal surface about the rotor structure, and the terminal surface flushes about the outer end of the skeleton muscle of moulding plastics and the rotor structure, and this has just increased the area of contact of terminal surface about skeleton muscle of moulding plastics and the rotor structure for the intensity of the skeleton muscle of moulding plastics further increases.

The rotor structure in the above embodiments may also be used in the technical field of motor equipment, that is, according to another aspect of the present invention, there is provided a motor, including a rotor structure, where the rotor structure is the rotor structure in the above embodiments.

It is to be understood that the foregoing examples, while indicating the preferred embodiments of the utility model, are given by way of illustration and description, and are not to be construed as limiting the scope of the utility model; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims (10)

1. A rotor structure, comprising:

the rotor comprises a rotor inner iron core and a plurality of rotor outer iron cores, wherein the plurality of rotor outer iron cores are arranged at intervals along the circumferential direction of the rotor inner iron core;

the rotor outer iron core comprises at least two triangular punching sheets and at least one convex punching sheet which are overlapped together, wherein one end of each triangular punching sheet and one end of each convex punching sheet, which are far away from the rotor inner iron core, are defined as outer ends, one end of each triangular punching sheet and one end of each convex punching sheet, which are close to the rotor inner iron core, are defined as inner ends, the outer ends of the triangular punching sheets and the outer ends of the convex punching sheets are same circular arcs, and a connecting line between the outer ends and the inner ends of the triangular punching sheets is a straight line; bulges are symmetrically arranged on the connecting line of the two sides of the outer end and the inner end of the bulge stamped sheet, and the radial size of each bulge is smaller than that of the outer end in the bulge stamped sheet; and a mounting groove for mounting the magnetic shoe is formed between the two adjacent rotor outer iron cores, and the outer end of the magnetic shoe is abutted to the protrusion.

2. The rotor structure of claim 1, wherein the upper and lower ends of the rotor outer core are triangular stamped pieces.

3. The rotor structure according to claim 2, wherein the number of the protruding stamped sheets in the outer core of the rotor is N, the N protruding stamped sheets are distributed in a central symmetry manner, and a symmetry center is an axial center of the outer core of the rotor; n is an even number greater than 0.

4. The rotor structure as claimed in claim 2, wherein the number of the protruding stamped pieces in the rotor outer core is M, and one of the protruding stamped pieces is located at the axial center of the rotor outer core; the rest protruding punching sheets are distributed in a centrosymmetric manner, and the symmetric center is the axial center of the rotor outer iron core; m is an odd number greater than 0.

5. A rotor structure according to claim 1, wherein a gap is provided between the projections of two adjacent rotor outer cores.

6. The rotor structure as claimed in claim 5, wherein the protruding stamped sheet is a T-shaped stamped sheet, the protrusion in the T-shaped stamped sheet is a circular arc in the radial direction, and the center point of the circular arc coincides with the center point of the outer end circular arc in the protruding stamped sheet.

7. A rotor structure according to claim 5, wherein the protruding stampings are bump stampings, and the protrusions in the bump stampings are bumps.

8. The rotor structure according to claim 1, wherein a plurality of limiting projections are provided on an outer peripheral surface of the rotor inner core, the plurality of limiting projections are provided at intervals in a circumferential direction of the rotor inner core, and the plurality of limiting projections abut against inner ends of the magnetic shoes.

9. The rotor structure of claim 8, wherein injection molding is filled between adjacent limiting lugs and the opposite magnetic shoes and the rotor outer core; and injection molding pieces between the adjacent rotor outer iron cores and the magnetic shoes positioned in the adjacent rotor outer iron cores are provided with injection molding framework ribs.

10. An electrical machine comprising a rotor structure, characterized in that the rotor structure is a rotor structure according to any one of claims 1-9.

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