CN219627459U - Rotor core, motor, compressor and refrigeration equipment - Google Patents

Abstract

The utility model discloses a rotor core, a motor, a compressor and refrigeration equipment, wherein the rotor core comprises a plurality of segmented cores which are sequentially arranged in the circumferential direction, each segmented core comprises a plurality of rotor punching sheets which are stacked in the axial direction of the rotor core, the plurality of rotor punching sheets comprise k types of rotor punching sheets, k is more than or equal to 2, and the same type of rotor punching sheet has the same structure; a plurality of connecting structures are arranged on each rotor punching sheet at intervals, each connecting structure comprises N rivets and M through holes, N is more than or equal to M is more than or equal to 1, and N+M is more than or equal to 3; in the axial direction of the rotor core, M rivets of the upper rotor punching sheet are connected with M through holes of the lower rotor punching sheet, and the rest rivets of the upper rotor punching sheet are connected with the rest rivets of the lower rotor punching sheet. The technical scheme of the utility model ensures the production efficiency of the rotor core and the rotor core is not scattered, and reduces the eddy current loss generated by the rivet, thereby improving the motor efficiency.

Description

Rotor core, motor, compressor and refrigeration equipment

Technical Field

The utility model relates to the technical field of motor equipment, in particular to a rotor core, a motor, a compressor and refrigeration equipment.

Background

In the related art, a rivet structure is arranged on the rotor punching sheet, and the connection between two adjacent punching sheets is connected with each other through a rivet and a rivet. However, the rivet may cause an increase in eddy current loss, which in turn may reduce motor efficiency. In order to reduce the efficiency loss caused by the rivet points, glue can be used for adhesion before punching, but the glue is expensive and the production efficiency of a production line is low, so that the glue is not applied to an air conditioner compressor motor.

Disclosure of Invention

The utility model mainly aims to provide a rotor core, which aims to reduce eddy current loss generated by riveting and improve motor efficiency while ensuring the production efficiency of the rotor core and preventing the rotor core from scattering.

In order to achieve the above purpose, the rotor core provided by the utility model comprises a plurality of segmented cores which are sequentially arranged in the circumferential direction, wherein each segmented core comprises a plurality of rotor punching sheets which are stacked in the axial direction of the rotor core, each rotor punching sheet comprises k types of rotor punching sheets, k is more than or equal to 2, and the same type of rotor punching sheet has the same structure; a plurality of connecting structures are arranged on each rotor punching sheet at intervals, each connecting structure comprises N rivets and M through holes, N is more than or equal to M is more than or equal to 1, and N+M is more than or equal to 3; in the axial direction of the rotor core, M rivets of the upper rotor punching sheet are connected with M through holes of the lower rotor punching sheet, and the rest rivets of the upper rotor punching sheet are connected with the rest rivets of the lower rotor punching sheet.

Optionally, the rotor punching sheet is provided with a magnet slot penetrating through the rotor core along the axial direction of the rotor core, the magnet slot divides the rotor punching sheet into a first yoke section and a second yoke section which are arranged along the direction of the central outward edge of the rotor core, and the first yoke section and/or the second yoke section are provided with the connecting structure.

Optionally, the connection structures on the first yoke section located on two sides of the central line of the rotor punching sheet are symmetrical with respect to the central line of the rotor punching sheet, and the connection structures on the second yoke section are located on the central line of the rotor punching sheet.

Optionally, a first magnetism isolating groove is further formed in the rotor punching sheet, and the first magnetism isolating groove is communicated with the magnet groove.

Optionally, at least two adjacent connecting structures are arranged on at least one upper rotor punching sheet, and the at least two connecting structures are all set as rivets and form a rivet group; the lower rotor punching sheet is provided with corresponding through holes corresponding to the rivets of the rivet group, and the through holes form a through hole group; or the lower rotor punching sheet is provided with a corresponding rivet group corresponding to the rivet group.

Optionally, the rivets of the rivet port group on the second yoke section are symmetrical with respect to the center line of the rotor punching sheet; or the through holes of the through hole group on the second yoke section are symmetrical with respect to the center line of the rotor punching sheet.

The utility model also provides a motor comprising the rotor core.

The utility model also provides a compressor comprising the motor.

The utility model also proposes a refrigeration device comprising a motor as described above or a compressor as described above.

According to the technical scheme, the plurality of segmented iron cores are sequentially arranged in the circumferential direction, each segmented iron core comprises the plurality of rotor punching sheets which are stacked in the axial direction of the rotor iron core, and compared with solid and massive materials, the rotor iron core formed by the rotor punching sheets can generate higher resistance. Thus, less vortex is generated, thereby ensuring less vortex loss. The rotor punching sheets comprise k types of rotor punching sheets, wherein k is more than or equal to 2, and the rotor punching sheets of the same type have the same structure; a plurality of connecting structures are arranged on each rotor punching sheet at intervals, each connecting structure comprises N rivets and M through holes, N is more than or equal to M is more than or equal to 1, and N+M is more than or equal to 3; in the axial direction of the rotor core, M rivets of the upper rotor punching sheet are connected with M through holes of the lower rotor punching sheet, and the rest rivets of the upper rotor punching sheet are connected with the rest rivets of the lower rotor punching sheet. Compared with the split iron core formed by adopting the same number of rivets, namely adopting the rotor punching sheet with N+M rivets, the contact area between the rivets and the rivets in the axial direction of the same connecting structure is reduced through the connection between the through holes and the rivets, namely, the original connection between the rivets and the rivets is changed into the connection between the rivets and the through holes and then the rivet is connected with the rivets, so that the interlayer vortex conduction degree of the scheme of the connection between the rivets and the through holes is lower, the eddy current loss can be further reduced, the cost of the scheme is lower, and the rotor iron core is ensured not to be scattered and the production and processing efficiency is not influenced; compared with the scheme that the segmented iron cores are formed by reducing the number of the rivets on the rotor punching sheets, the scheme does not influence the riveting firmness between the rotor punching sheets and the overall rigidity of the rotor iron cores formed by the rotor punching sheets is good.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural view of an embodiment of a segmented core of the present utility model;

fig. 2 is a schematic structural view of a first rotor sheet when n+m=3;

fig. 3 is a schematic structural view of a second rotor sheet when n+m=3;

fig. 4 is a schematic structural view of a first rotor sheet when n+m=4;

fig. 5 is a schematic structural view of a second rotor sheet when n+m=4;

fig. 6 is a schematic structural diagram of a third rotor sheet when n+m=4.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a rotor core.

Referring to fig. 1 to 6, in an embodiment of the present utility model, the rotor core (not shown) includes a plurality of segmented cores 10 arranged in sequence in the circumferential direction, and eddy currents are a kind of magnetic loss, which is referred to as eddy current loss when the motor power is lost. There are many factors affecting eddy current loss, including the thickness of the magnetic material, the frequency of the induced electromotive force, and the magnetic flux density. When the cross-sectional area of the material is reduced, this results in a reduction of eddy currents, and therefore, it is necessary to keep the material thin, and the cross-sectional area of the rotor core can be reduced as much as possible in a block manner as compared with a monolithic manner, thereby reducing the eddy current flow and loss. Each of the segmented cores 10 includes a plurality of rotor laminations 1 stacked in the axial direction of the rotor core, and heat is often generated after the generation of eddy currents, and the segmented core 10 formed of an integral iron block emits large eddy currents, which are sufficient to completely melt the core. By forming the segmented core 10 from the lamination of the rotor sheet 1, eddy currents and heat generated thereby can be reduced, and the rotor core formed from the rotor sheet 1 can generate higher electrical resistance than solid and massive materials. Thus, less vortex is generated, thereby ensuring less vortex loss.

Referring to fig. 2 to 6, specifically, the plurality of rotor sheets 1 includes k types of rotor sheets 1, k is greater than or equal to 2, and the rotor sheets 1 of the same type have the same structure; a plurality of connecting structures 13 are arranged on each rotor punching sheet 1 at intervals, wherein the connecting structures 13 comprise N rivets 131 and M through holes 132, N is more than or equal to M is more than or equal to 1, and N+M is more than or equal to 3; the same structure of the rotor sheet 1 of the same kind means that the overall shape and size of the rotor sheet 1 are the same, and also means that the positions of the connecting structures 13 on the rotor sheet 1 are the same, that is, the rotor sheet 1 of the same kind is in the same arrangement form of the rivets 131 or the through holes 132 on the plurality of connecting structures 13, so that the lamination effect is ensured, the material of the rotor sheet 1 can be made of common silicon steel materials, the silicon steel materials mainly comprise steel and silicon combination, on one hand, the resistance is improved along with the combination of the silicon and the steel and the occurrence of magnetic field penetrating materials, on the other hand, the silicon steel materials can minimize the possibility of corrosion, and the hysteresis loss of the steel is also improved.

In connection with fig. 1, specifically, M rivets 131 of the upper rotor sheet 1 are connected with M through holes 132 of the lower rotor sheet 1 in the axial direction of the rotor core, and the remaining rivets 131 of the upper rotor sheet 1 are connected with the remaining rivets 131 of the lower rotor sheet 1. In the related art, a rivet 131 structure is disposed on the rotor punching sheet 1, and the connection between two adjacent rotor punching sheets 1 is connected with each other through the rivet 131 and the rivet 131. However, the rivet 131 causes an increase in eddy current loss, which in turn reduces motor efficiency. In order to reduce the efficiency loss caused by the rivet 131, the rotor punching sheets 1 can be adhered by glue, but the glue is expensive and the production efficiency of a production line is low; or the number of the rivets 131 is reduced, for example, three or more rivets 131 are originally adopted for connection, and a smaller number of rivets 131 are adopted instead, for example, one rivet 131 or two rivets 131 are adopted for connection, but the riveting firmness between the rotor punching sheets 1 is affected, so that the overall rigidity of the rotor iron core is poor, and the rotor iron core generates larger vibration and noise problems in the use process. In the scheme, N rivets 131 and M through holes 132 are arranged on each type of rotor punching sheet 1, M rivets 131 of the upper rotor punching sheet 1 are connected with M through holes 132 of the lower rotor punching sheet 1, and the rest of rivets 131 of the upper rotor punching sheet 1 are connected with the rest of rivets 131 of the lower rotor punching sheet 1. Compared with the adoption of the same number of the rivets 131, namely, the segmented iron core 10 formed by the rotor punching sheet 1 with the n+M rivets 131 is connected with the rivets 131 through the through holes 132, the contact area between the rivets 131 and the rivets 131 in the axial direction of the same connecting structure 13 is reduced, namely, the original connection between the rivets 131 and the rivets 131 is changed into the connection between the rivets 131 and the through holes 132 and then the connection between the rivets 131 and the rivets 131 is changed into the connection between the rivets 131 and the through holes 132, so that the interlayer vortex conduction degree of the scheme of the connection between the rivets 131 and the through holes 132 is lower, the vortex loss can be reduced, the number of the rivets 131 is reduced, the vortex loss of the rivets 131 is reduced, and the motor efficiency is improved.

According to the technical scheme, the plurality of segmented iron cores 10 are sequentially arranged in the circumferential direction, each segmented iron core 10 comprises the plurality of rotor punching sheets 1 which are stacked in the axial direction of the rotor iron core, and compared with solid and massive materials, the rotor iron core formed by the rotor punching sheets 1 can generate higher resistance. Thus, less vortex is generated, thereby ensuring less vortex loss. The rotor punching sheets 1 comprise k types of rotor punching sheets 1, wherein k is more than or equal to 2, and the rotor punching sheets 1 of the same type have the same structure; a plurality of connecting structures 13 are arranged on each rotor punching sheet 1 at intervals, wherein the connecting structures 13 comprise N rivets 131 and M through holes 132, N is more than or equal to M is more than or equal to 1, and N+M is more than or equal to 3; in the axial direction of the rotor core, M rivets 131 of the upper rotor sheet 1 are connected with M through holes 132 of the lower rotor sheet 1, and the remaining rivets 131 of the upper rotor sheet 1 are connected with the remaining rivets 131 of the lower rotor sheet 1. The rivet 131 is connected with the through hole 132 through the rivet 131, and the rivet 131 is connected with the rivet 131, so that compared with the method for reducing the number of the rivets 131 by adopting glue adhesion, the cost of the scheme is lower, and the rotor core is ensured not to be scattered and the production and processing efficiency is not influenced; compared with the scheme of forming the segmented iron core 10 by reducing the number of the rivets 131 on the rotor punching sheet 1, the scheme does not influence the riveting firmness between the rotor punching sheets 1 and has better overall rigidity of the rotor iron core formed by the rotor punching sheets 1.

Further, the rotor punching sheet 1 is provided with a magnet slot 15 penetrating through the rotor core along the axial direction of the rotor core, and the magnet slot 15 is located between the plurality of connection structures 13. In one embodiment, the rotor core is applied to a permanent magnet motor having a stator with wound coils and a rotor with permanent magnets. The rotor core is internally provided with magnet slots 15 for placement of permanent magnets, and the positions of the permanent magnets in the rotor core may be surface-mounted, such as surface-mounted and insert-mounted, or built-in, such as radial, tangential and hybrid. The magnet slots 15 are located between the plurality of connection structures 13, so that the lamination effect is not affected, and the connection acting force is more uniform.

Further, the rotor punching sheet 1 is further provided with a first magnetism isolating slot 16, and the first magnetism isolating slot 16 is communicated with the magnet slot 15. The magnet slots 15 are provided with permanent magnets, and first magnetism isolating slots 16 extending in the rotation axis direction of the rotor core are provided at circumferential end portions of the magnet slots 15 to prevent short-circuiting of magnetic fluxes of the permanent magnets, and the first magnetism isolating slots 16 are provided at both ends of the rotor sheet 1, for example, the magnet slots 15 are in a straight shape. In one embodiment, the first magnetism isolating grooves 16 are formed symmetrically with respect to the center of the permanent magnet, and the first magnetism isolating grooves 16 function as so-called active magnetic barriers for preventing efficiency degradation due to the winding of magnetic flux around the ends of the permanent magnet, in addition to facilitating the insertion of the permanent magnet; in another embodiment, the first magnetism isolating grooves 16 at both ends are asymmetric with respect to the center of the permanent magnet, so that the strength of the magnetic field generated at the outer periphery of the rotor can be relaxed, and the torque fluctuation due to the rotation can be suppressed.

Specifically, the magnet slot 15 is V-shaped, and the first magnetism isolating slot 16 is located at two ends of the V-shape. The V-shaped magnet groove 15 is formed by connecting two linear magnet grooves 15, and a first magnetism isolating groove 16 is formed at the sharp angle of the V-shaped, so that two permanent magnets positioned in the V-shaped magnet groove 15 are separated, smoothness of a magnetic circuit can be effectively ensured, and the efficiency of the permanent magnet motor is improved.

In other embodiments, two linear magnet slots 15 may form a V-shape.

Further, the magnet slot 15 divides the rotor sheet 1 into a first yoke section 11 and a second yoke section 12 disposed along the direction of the central outward edge of the rotor core, and at least one connecting structure 13 is disposed on the first yoke section 11.

Referring to fig. 2 to 4, in an embodiment, k=2, that is, the segmented core 10 is formed by two different types of rotor laminations 1, and the rotor laminations 1 include a first yoke segment 11 and a second yoke segment 12 located on two sides of a magnet slot 15, and at least one connecting structure 13 is provided on the first yoke segment 11. For example, the first yoke section 11 of the first rotor punching sheet 1 is provided with a rivet 131, and the second yoke section 12 is provided with two rivets 131 and a through hole 132; the first yoke section 11 of the second rotor sheet 1 is provided with a through hole 132, the second yoke section 12 is provided with three rivets 131, at least two different rotor sheets 1 are needed, otherwise, the condition that one rivet 131 of the upper rotor sheet 1 is connected with one through hole 132 of the lower rotor sheet 1, and the rest of rivets 131 of the upper rotor sheet 1 are connected with the rest of rivets 131 of the lower rotor sheet 1 cannot be satisfied.

The types of the rotor punching sheet 1 are related to the ordering of the through holes 132 or the rivets 131 of the plurality of connecting structures 13, but when the rotor punching sheets 1 of different types are stacked to form the segmented core 10, it is required that the M rivets 131 of the upper rotor punching sheet 1 are connected with the M through holes 132 of the lower rotor punching sheet 1, and the remaining rivets 131 of the upper rotor punching sheet 1 are connected with the remaining rivets 131 of the lower rotor punching sheet 1.

It will be appreciated that N and M are both positive integers greater than 1.

The position of connection structure 13 on rotor punching 1 can influence the effect of range upon range of, in order to avoid the condition such as the limit of warping appears in the piecemeal iron core 10, leads to combining insecurely, influences the quality of rotor core, rotor punching 1 includes first yoke section 11 and second yoke section 12, is equipped with at least on the first yoke section 11 connection structure 13. The rotor punching sheet 1 is approximately in a fan shape, and the situation that edges of the segmented iron core 10 are warped is avoided by ensuring that at least one rivet 131 or through hole 132 is arranged on the first yoke segment 11.

In an embodiment, two types of rotor sheets 1 may be stacked, wherein a rivet 131 is arranged on the first yoke section 11 of the first type of rotor sheet 1, and a rivet 131 and a through hole 132 are arranged on the second yoke section 12; the positions of the rivets 131 and the through holes 132 on the second yoke section 12 of the second type rotor sheet 1 are different.

Referring to fig. 2 to fig. 4, in another embodiment, three types of rotor sheets 1 may be stacked, the center line 14 of the rotor sheet 1 is perpendicular to the axis of the rotor core, and is located on the plane of the rotor sheet 1, the V-shaped magnet slot 15 is separated into two parts, namely, a left part and a right part, by the center line 14 of the rotor sheet 1 in the previous scheme, a connection structure 13 is respectively provided on the first yoke section 11 and the second yoke section 12, and one connection is provided on the left part and the right part, and the connection structure 13 is located on the second yoke section 12 and on the center line 14 of the rotor sheet 1, and is a rivet 131, so that the connection of the second yoke section 12 is firm, so that the riveting force between the rotor sheets 1 is more uniform, the situation of edge warping is avoided, the number of through holes 132 and the rivet 131 is two, and the through holes 132 are sequentially arranged to respectively obtain three types of rotor sheets 1, and the three types of rotor sheets 1 can be sequentially stacked to form a split-core 10.

Further, in order to make the riveting force between the rotor punching sheets 1 more uniform, at least one upper rotor punching sheet 1 is provided with at least two adjacent connecting structures 13, and the at least two connecting structures are all provided with rivets 131 and form a rivet group; the lower rotor punching sheet 1 is provided with corresponding through holes 132 corresponding to the rivets 131 of the rivet set, and the through holes 132 form a through hole set; or, the lower rotor punching sheet 1 is provided with a corresponding rivet group corresponding to the rivet group. In this way, the rotor punching sheet 1 can be well limited, that is, the rotor punching sheet 1 is provided with a plurality of connection modes of connecting the rivet button 131 and connecting the rivet button 131 and the through hole 132, specifically, the connection structure 13 on the first yoke section 11 is arranged on the central line 14 of the rotor punching sheet 1, and the connection structures 13 on the second yoke section 12, which are positioned on two sides of the central line 14 of the rotor punching sheet 1, are symmetrical with respect to the central line 14 of the rotor punching sheet 1. The connecting structures 12 may be arranged singly or in groups, and when the number of connecting structures 13 is an odd number greater than three, such as n+m=5, the connecting structures 13 on the rotor sheet 1 are arranged on the center line 14 of the rotor sheet 1 in order to ensure that the riveting force on the rotor sheet 1 is more uniform. I.e. the connection structures 13, whether through holes 132 or rivets 131, on the teeth of the second yoke section 12 are arranged along the centre line 14 of the rotor blade 1; thereby the tooth root is uniformly stressed, and the structural stability is improved.

Further, the rotor punching sheet 1 further includes a second magnetism isolating slot 17, the second magnetism isolating slot 17 is disposed between the magnet slot 15 and the outer contour 18 of the rotor punching sheet 1, the second magnetism isolating slot 17 can improve noise indexes such as cogging torque of the permanent magnet motor, and can provide a smooth magnetic circuit for reluctance torque of the permanent magnet motor, so that the duty ratio of the reluctance torque is improved, and efficiency of the permanent magnet motor can be improved.

Specifically, the second magnetism isolating grooves 17 are provided in plural at intervals along the circumferential direction of the rotor core. Therefore, the noise of the permanent magnet motor in the working process is reduced, noise indexes such as cogging torque and the like are optimized, meanwhile, a smooth magnetic circuit is provided for reluctance torque of the permanent magnet motor, the duty ratio of the reluctance torque is improved, the rotor core has the effect of improving the noise index, meanwhile, the efficiency of the permanent magnet motor is improved, and the permanent magnet motor rotor is simple in structure and easy to manufacture and produce.

Further, the rotor core formed by the rotor sheets 1 is excellent in overall rigidity for the purpose of securing caulking between the rotor sheets 1. The rivet buttons 131 of the rivet port group on the second yoke section 12 are symmetrical with respect to the central line of the rotor punching sheet 1; or the through holes 132 of the through hole group on the second yoke segment 12 are symmetrical with respect to the center line of the rotor punching sheet 1, in order to ensure the riveting effect, if the connecting structure 13 is present on the first yoke segment 11, the connecting structure 13 is symmetrical with respect to the center line of each pole of magnet, in this embodiment, the center line of the rotor punching sheet 1. The above description describes that, in order to avoid the situation that the split iron core 10 has a raised edge, the combination is not firm, and the quality of the rotor iron core is affected, because the problems of burrs, rust, and uneven lamination of the punched sheet are reflected on the performance of the motor in the manufacturing process. In order to ensure a lamination effect between the rotor laminations 1. Therefore, the loss at the tooth part of the second yoke section 12 can be minimized, the minimum motor loss can be obtained under the condition of ensuring the excellent motor precision, and the smaller electromagnetic efficiency attenuation degree of the motor can be ensured. N is more than or equal to M is more than or equal to 2, and at least one rivet 131 is arranged in the tooth part area of the second yoke section 12 of the rotor punching sheet 1, so that the connection firmness of the intersection area is ensured. In order not to affect the efficiency of the production process and to ensure that the rivet 131 and the through hole 132 are mated, the size of the through hole 132 is not smaller than the size of the rivet 131.

In one embodiment, the rivets 131 on the rotor sheet 1 are in the form of circular rivets 131, which is beneficial to generating eddy currents in the motor and can control the temperature rise well.

In another embodiment, the rivet 131 on the rotor sheet 1 is in the form of square rivet 131, also called v-rivet 131, and the accuracy requirement of the punch is not as high as that of round rivet 131.

The utility model also provides a motor, which comprises a stator and a rotor, wherein the rotor comprises a rotor iron core, and the specific structure of the rotor iron core refers to the embodiment, and as the motor adopts all the technical schemes of all the embodiments, the motor at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted. Wherein, the motor is a permanent magnet motor and mainly comprises a stator, a rotor, an end cover and other parts; the stator is laminated from laminations to reduce the iron loss generated during operation of the motor and incorporates three-phase ac windings, known as armatures. The stator winding surrounds the stator core, and the frequency of the input current of the stator winding is controlled to control the rotation frequency of the magnetic field and further control the rotation speed. The rotor includes a rotor core with permanent magnet material mounted thereon. According to the different positions of the permanent magnet materials on the motor rotor, the permanent magnet motor can be divided into a surface-mounted permanent magnet motor and a built-in permanent magnet synchronous motor.

The utility model also provides a compressor, and the compressor adopts all the technical schemes of all the embodiments, so that the compressor has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.

The utility model also provides a refrigeration device, which adopts all the technical schemes of all the embodiments, so that the refrigeration device at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (9)

1. The rotor core is characterized by comprising a plurality of segmented cores which are sequentially arranged in the circumferential direction, wherein each segmented core comprises a plurality of rotor punching sheets which are stacked in the axial direction of the rotor core, each rotor punching sheet comprises k types of rotor punching sheets, k is more than or equal to 2, and the same type of rotor punching sheet has the same structure; a plurality of connecting structures are arranged on each rotor punching sheet at intervals, each connecting structure comprises N rivets and M through holes, N is more than or equal to M is more than or equal to 1, and N+M is more than or equal to 3; in the axial direction of the rotor core, M rivets of the upper rotor punching sheet are connected with M through holes of the lower rotor punching sheet, and the rest rivets of the upper rotor punching sheet are connected with the rest rivets of the lower rotor punching sheet.

2. The rotor core according to claim 1, wherein the rotor sheet is provided with a magnet slot penetrating the rotor core in an axial direction of the rotor core, the magnet slot dividing the rotor sheet into a first yoke section and a second yoke section provided in a direction along a center-to-outer edge of the rotor core, and the first yoke section and/or the second yoke section is provided with the connecting structure.

3. The rotor core of claim 2, wherein the connection structures on the first yoke segment on both sides of the centerline of the rotor core segment are symmetrical about the centerline of the rotor core segment, and wherein the connection structures on the second yoke segment are disposed on the centerline of the rotor core segment.

4. A rotor core as claimed in claim 3, wherein the rotor sheet is further provided with a first magnetism isolating slot, the first magnetism isolating slot being in communication with the magnet slot.

5. The rotor core of claim 2, wherein at least one upper rotor sheet is provided with at least two adjacent connecting structures, wherein each of the at least two connecting structures is provided as a rivet and forms a rivet group; the lower rotor punching sheet is provided with corresponding through holes corresponding to the rivets of the rivet group, and the through holes form a through hole group; or the lower rotor punching sheet is provided with a corresponding rivet group corresponding to the rivet group.

6. The rotor core of claim 5, wherein the rivets of the rivet set on the second yoke segment are symmetrical about a centerline of the rotor blank; or the through holes of the through hole group on the second yoke section are symmetrical with respect to the center line of the rotor punching sheet.

7. An electric machine comprising the rotor core as claimed in any one of claims 1 to 6.

8. A compressor comprising an electric motor as claimed in claim 7.

9. A refrigeration apparatus comprising a motor as claimed in claim 7 or a compressor as claimed in claim 8.