Rotor, motor, compressor and refrigeration equipment

Abstract

The invention discloses a rotor, a motor, a compressor and refrigeration equipment, the rotor comprises a permanent magnet and a rotor iron core, the rotor iron core is provided with a plurality of structural groups, each structural group comprises a mounting groove and n slits, n is a positive integer, the permanent magnet is arranged in the mounting groove, and the slits are arranged in the mounting groove. The slits are located between the mounting grooves and the outer peripheral surface of the rotor core, the width of each slit is Ln, the width of each mounting groove is b, the total width of the n slits is Sigma Ln, Sigma Ln = L1 + L2 +... + Ln, and the relationship between Sigma Ln and b is 0.1 < = Sigma Ln / b < = 0.5. According to the technical scheme, the magnetic line trend can be optimized, magnetic leakage is reduced, the permanent magnet utilization rate is improved, and the motor efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor, a motor, a compressor and a refrigeration device. Background Art

[0002] Permanent magnet motors have the advantages of low loss and high efficiency. Today, as energy conservation and environmental protection are increasingly valued, they are used more and more widely. For example, in applications such as fans, pumps, compressors, etc. that run continuously, at a constant speed and in a single direction, ordinary asynchronous motors waste electricity due to efficiency and power factor, and are gradually being replaced by permanent magnet motors. At the same time, many industrial machines need to set and adjust their operating speeds at will, but the speed control accuracy requirements are not high. Permanent magnet synchronous motors are gradually becoming the main products in this occasion due to their small size, high efficiency and energy saving.

[0003] Permanent magnet synchronous generators can be divided into two types based on the rotor structure: permanent magnet surface mounted type and permanent magnet embedded type. Compared with surface mounted permanent magnet synchronous motors, embedded permanent magnet generators have a long service life and can prevent sudden short circuits and demagnetization of three phases. However, for high-power permanent magnet synchronous generators with embedded permanent magnets, the permanent magnet magnetic fields between adjacent poles are easily directly connected, which will cause magnetic leakage and result in low utilization of permanent magnet materials. Summary of the invention

[0004] The main purpose of the present invention is to provide a rotor, aiming to reduce magnetic leakage and improve the utilization rate of permanent magnets.

[0005] To achieve the above object, the rotor proposed in the present invention comprises:

[0006] permanent magnets; and

[0007] The rotor core is provided with a plurality of structural groups, the structural groups include mounting grooves and n slits, n is a positive integer, the permanent magnet is arranged in the mounting groove, the slit is located between the mounting groove and the outer peripheral surface of the rotor core, and the width of the slit is L n , the width of the mounting groove is b, and the total width of the n slits is ∑L n , the ∑L n =L1+L2+…+L n , the ∑L n The relationship with b is 0.1≤∑L n / b≤0.5.

[0008] Optionally, the width L of the slit n The value range is: 0.4mm≤L n ≤2mm.

[0009] Optionally, the width b of the mounting groove is in the range of 5 mm ≤ b ≤ 18 mm; and / or

[0010] The thickness of the mounting groove is h, and the value range of h is: 1.2mm≤h≤4.2mm.

[0011] Optionally, the number of poles of the rotor core is 6, 8 or 10.

[0012] Optionally, the mounting groove is arranged in a V shape; or

[0013] The installation groove is arranged in a straight line shape.

[0014] Optionally, the installation groove is in an axisymmetric shape, and the n slits in each group of the structural groups are in an axisymmetric shape relative to the symmetry axis of the installation groove; or

[0015] The n slits in each structure group may also be in an asymmetric pattern.

[0016] Optionally, the slit is arranged in a long strip shape; or

[0017] The slits are arranged in a fan shape.

[0018] Optionally, the rotor core is provided with a plurality of rivet holes, and the rivet holes are evenly arranged on the surface of the rotor core along the circumferential direction of the rotor core; and / or

[0019] The rotor core is provided with a plurality of flow holes, and the flow holes are evenly arranged on the surface of the rotor core along the circumferential direction of the rotor core.

[0020] The present invention further provides a motor, comprising a stator and the above-mentioned rotor, wherein the rotor is rotatably disposed inside the stator.

[0021] Optionally, the stator is provided with stator slots, and the number of the stator slots is 9, 12 or 15.

[0022] The present invention also provides a compressor, comprising the motor as claimed in claim 10 or 11.

[0023] The present invention also provides a refrigeration device, comprising the above-mentioned compressor.

[0024] The above rotor has at least the following beneficial effects:

[0025] The technical solution of the present invention adopts a permanent magnet and a rotor core. The rotor core is provided with multiple groups of structural groups. The structural groups include a mounting groove and n slits, where n is a positive integer. The permanent magnet is arranged in the mounting groove. The slit is located between the mounting groove and the outer peripheral surface of the rotor core. The width of the slit is L. n , the width of the mounting groove is b, and the total width of the n slits is ∑L n,∑L n =L1+L2+…+L n ,∑L n The relationship with b is 0.1≤∑L n / b≤0.5. Specifically, since the magnetic permeability of air is quite different from that of the main material of the rotor punching sheet, opening some slits at appropriate positions is beneficial to improving the distribution of magnetic flux lines. The inventors have found that by setting the slits between the mounting slot and the outer peripheral surface of the rotor core, not only can the original distribution of magnetic flux lines be changed and the efficiency of the motor be improved, but also the influence of the motor armature magnetic field on the rotor main magnetic field can be reduced, the motor load magnetic density can be improved, the air gap magnetic density waveform of the motor can be optimized, and the harmonic content can be reduced, thereby improving the radial force of the motor and reducing the vibration noise and iron loss of the motor. Moreover, the total width ∑L of the n slits is set to n The ratio of the slit width to the mounting slot width b is limited to between 0.1 and 0.5. The slit size and the width of the magnet slot are reasonably set to optimize the direction of the magnetic lines of force, reduce magnetic leakage, increase the utilization rate of the magnet, and improve the efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 It is a schematic structural diagram of a rotor according to an embodiment of the present invention;

[0028] Figure 2 It is a structural schematic diagram of an embodiment of a rotor core of a rotor of the present invention;

[0029] Figure 3 It is a structural schematic diagram of another embodiment of the rotor core of the rotor of the present invention;

[0030] Figure 4 It is a structural schematic diagram of another embodiment of the rotor core of the rotor of the present invention;

[0031] Figure 5 It is a structural schematic diagram of another embodiment of the rotor core of the rotor of the present invention;

[0032] Figure 6 The performance test data diagram of the motor and compressor using the rotor of this solution;

[0033] Figure 7 The figure is a performance test data diagram of a motor using the rotor of this solution.

[0034] Description of Figure Numbers:

[0035] Label name Label name 100 permanent magnet 212 Slit 200 Rotor core 220 Rivet holes 210 Structure Group 230 Flow hole 211 Mounting slot

[0036] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] The present invention provides a rotor.

[0042] Reference Figure 1 , Figure 2 , Figure 6 and Figure 7 In one embodiment of the present invention, the rotor includes a permanent magnet 100 and a rotor core 200. The rotor core 200 is provided with a plurality of structure groups 210. The structure group 210 includes a mounting groove 211 and n slits 212, where n is a positive integer. The permanent magnet 100 is provided in the mounting groove 211. The slit 212 is located between the mounting groove 211 and the outer peripheral surface of the rotor core 200. The width of the slit 212 is L. n , the width of the mounting groove 211 is b, and the total width of the n slits 212 is ∑L n ,∑L n =L1+L2+…+L n ,∑L n The relationship with b is 0.1≤∑L n / b≤0.5.

[0043] Specifically, further, since the magnetic permeability of air is quite different from that of the main material of the rotor punching sheet, opening some slits 212 at appropriate positions is beneficial to improving the distribution of magnetic flux lines. The inventors have found that setting the slits 212 between the mounting slot 211 and the outer peripheral surface of the rotor core 200 can not only change the original distribution of magnetic flux lines and improve the efficiency of the motor; it can also reduce the influence of the motor armature magnetic field on the rotor main magnetic field, improve the motor load magnetic density, optimize the motor air gap magnetic density waveform, reduce the harmonic content, and thus improve the radial force of the motor and reduce the vibration noise and iron loss of the motor. And the total width ∑L of the n slits 212 is set to n The ratio of the width b of the installation slot 211 is limited to between 0.1 and 0.5. The size of the slit 212 and the width of the magnet slot are reasonably set to optimize the direction of the magnetic lines of force, reduce magnetic leakage, increase the utilization rate of the magnet, and improve the efficiency of the motor.

[0044] Furthermore, the rotor core 200 includes a plurality of rotor punchings, which are stacked in the axial direction of the rotor core 200 , and adjacent rotor punchings are interconnected and press-fitted, thereby forming the rotor core 200 as a whole.

[0045] Furthermore, the rotor punching sheets are made of soft magnetic material. Soft magnetic material can achieve a larger magnetization intensity with a smaller external magnetic field. Soft magnetic material has low coercive force and high magnetic permeability, which is beneficial to reducing the loss of the rotor core 200, that is, reducing the iron loss of the motor, and thus helping to improve the performance of the motor.

[0046] Specifically, the rotor punching sheet can be a silicon steel sheet. By forming the rotor core 200 with multiple layers of stacked silicon steel sheets, the magnetic flux density between the two magnetic poles of the rotor core 200 can be increased. During the processing, an insulating layer is provided on the surface of each layer of the rotor punching sheet to prevent the eddy current generated by the rotor assembly during operation from causing power loss. Of course, the present invention is not limited to this. In some other embodiments, the rotor punching sheet can also be made of other materials.

[0047] Optionally, in this embodiment, the width L of the slit 212 is n The value range is: 0.4mm≤L n ≤2mm, which is conducive to reducing the difficulty of processing and can also maintain a certain strength inside the rotor core 200; if L n <0.4mm will greatly increase the difficulty of rotor punching processing, and it is difficult to ensure processing accuracy and meet design requirements. n >2mm will cause the size of the rotor core 200 to be too large, affecting the size of the rotor, and the width L of the slit 212 n If it is too large, there will be no space for the magnetic field to pass through.

[0048] Optionally, in this embodiment, the value range of the width b of the installation groove 211 is: 5mm≤b≤18mm. Specifically, the width b of the installation groove 211 is adapted to the width of the permanent magnet 100, that is, it is adapted to the thickness of the permanent magnet in the magnetization direction. The width b of the installation groove 211 is limited to between 5mm and 8mm, which can limit the thickness of the permanent magnet 100 in the magnetization direction, ensure the utilization rate of the permanent magnet 100, improve the cost performance of the permanent magnet 100, and avoid the demagnetization of the permanent magnet 100 during operation. It should be noted that after the outer diameter of the rotor is determined, it is not the case that the more the amount of permanent magnet 100 is used, the better. After the amount of permanent magnet 100 reaches a certain level, the amount of permanent magnet 100 continues to increase. After the rotor is assembled, the permanent magnet 100 cannot be saturated and magnetized. If the rotor is assembled with magnetism, it will absorb iron chips, which cannot meet the production requirements of no iron chips and the product requirements of no iron chips inside the compressor. If the permanent magnet 100 is not saturated in magnetization, the utilization rate of the permanent magnet 100 is reduced, and there is a problem of demagnetization during operation. The thickness of the permanent magnet 100 in the magnetization direction needs to meet the anti-demagnetization requirements, and the contribution of the thickness direction to the increase in magnetic load is far less than the contribution of the width. The increase in thickness reduces the cost performance of the permanent magnet 100; if the width b of the mounting groove 211 is less than 5mm, the thickness of the permanent magnet 100 in the magnetization direction is set too small, and the anti-demagnetization ability of the permanent magnet 100 cannot meet the requirements; if the width b of the mounting groove 211 is greater than 8mm, the thickness of the permanent magnet 100 in the magnetization direction is set too large, the permanent magnet 100 cannot be saturated in magnetization, and the cost performance of the permanent magnet 100 is reduced.

[0049] Optionally, in the present embodiment, the thickness of the mounting groove 211 is h, and the value range of h is: 1.2mm≤h≤4.2mm; specifically, the thickness of the mounting groove 211 is adapted to the thickness of the permanent magnet 100. When the thickness h of the mounting groove is less than 12mm, that is, the thickness of the permanent magnet 100 is small, the magnetic flux density will be small, and the output power of the motor will be small, thereby reducing the efficiency of the motor; when the thickness h of the mounting groove 211 is greater than 4.2, that is, the thickness of the permanent magnet 100 is large, magnetic circuit saturation will occur, resulting in increased magnetic circuit loss, thereby reducing the efficiency of the motor. The present solution limits the thickness of the mounting groove 211 to between 1.2mm and 4.2mm, so that the output power of the motor can meet the requirements of the compressor, while not making the thickness of the permanent magnet 100 too large, thereby reducing the magnetic circuit loss and improving the efficiency of the motor.

[0050] Optionally, in the second embodiment, the width b of the installation groove 211 is in the range of 5 mm ≤ b ≤ 18 mm; the thickness of the installation groove 211 is h, and the value range of h is 1.2 mm ≤ h ≤ 4.2 mm.

[0051] Optionally, the number of poles of the rotor core 200 is 6, 8 or 10. By further limiting the number of poles of the rotor core 200, the performance of the motor with a number of slot poles that satisfies the above relationship is higher, and the anti-demagnetization ability of the motor is improved to meet the reliability of the use requirements of the compressor, thereby improving the reliability of the compressor operation.

[0052] Optionally, in the present embodiment, the mounting groove 211 is arranged in a V-shape; by arranging a V-shaped mounting groove 211 on the rotor punching and optimizing the angle parameters of the V-shaped mounting groove 211, the amount of the permanent magnet 100 embedded in the rotor punching proposed by the present invention is significantly improved compared with the prior art, thereby improving the torque density of the motor, and then effectively improving the back electromotive force of the motor and the efficiency of the motor. Through this V-shaped mounting groove 211 structure, the amount of the embedded permanent magnet 100 is significantly increased, thereby improving the torque density of the motor, and meeting the requirements of high efficiency and miniaturization of the motor.

[0053] Furthermore, the structure of the mounting groove 211 is symmetrical along the magnetic pole center line of the rotor core 200 and can be implemented as a preferred solution of the embodiment of the present invention.

[0054] Optionally, in the second embodiment, the mounting groove 211 is arranged in a "I"-shaped mounting groove 211; it should be noted that the technical solution of the present invention can be implemented by using a "I"-shaped mounting groove 211 in addition to a V-shaped mounting groove 211, and the permanent magnet 100 is placed orthogonal to the diameter direction of the rotor core. Of course, since the V-shaped mounting groove 211 can increase the amount of embedded permanent magnets 100, thereby improving the torque density of the motor and meeting the requirements of high efficiency and miniaturization of the motor, its technical effect is better than that of a linear groove, so it can be implemented as a preferred solution. However, its structure is more complicated than the "I"-shaped mounting groove 211, and the process cost is higher than the "I"-shaped mounting groove 211, so it can be selected according to actual needs during specific implementation.

[0055] Optionally, referring to FIG. Figures 1 to 4 , the mounting groove 211 is an axisymmetric shape, and the n slits 212 of each structural group 210 are an axisymmetric shape relative to the symmetry axis of the mounting groove 211; this can make the processing technology simpler, can further reduce the influence of the motor armature magnetic field on the rotor main magnetic field, can further reduce the influence of the motor armature magnetic field on the rotor main magnetic field, improve the motor load magnetic density, optimize the motor air gap magnetic density waveform, thereby improving the radial force of the motor and reducing the noise of the motor, and improving the cost performance of the motor. Of course, the present invention is not limited to this. In other embodiments, refer to Figure 5 The n slits 212 of each structural group 210 may also be distributed asymmetrically, and the slits 212 may not use the same size parameters. As long as the structure can organize the magnetic flux lines without destroying the mechanical strength of the punching sheet, it should be regarded as the protection scope of the claims.

[0056] Optionally, in one embodiment, referring to Figure 1 , Figure 2 , Figure 4 and Figure 5 The slit 212 is arranged in a long strip shape; the length direction of the slit 212 extends along the permanent magnet 100 toward the outer wall of the rotor core 200.

[0057] Optionally, refer to Figure 3 The slit 212 may also be arranged in a fan shape.

[0058] Optionally, refer to Figures 1 to 5, the lengths of the multiple slits 212 located on both sides of the symmetry axis gradually decrease in the direction away from the symmetry axis; this can ensure that the multiple slender slits 212 can effectively reduce the influence of the motor armature magnetic field on the rotor main magnetic field, and at the same time optimize the air gap magnetic flux waveform, thereby ensuring a good noise reduction effect. The air gap generated between the slits 212 can make the improvement effect on the magnetic field generated by the permanent magnet 100 more obvious. Of course, the present invention is not limited to this. In other embodiments, the lengths of the multiple slits 212 located on both sides of the symmetry axis can also remain unchanged in the direction away from the symmetry axis.

[0059] Furthermore, the distances between the plurality of slits 212 and the outer peripheral edge of the rotor core 200 are substantially equal or completely equal.

[0060] Furthermore, the plurality of slits 212 are arranged in parallel.

[0061] Furthermore, in one embodiment, the distance from each slit 212 to the outer peripheral edge of the rotor core 200 is greater than twice the thickness of a single rotor core 200, so that the connection between the outer peripheral edge of the rotor core 200 and the slit 212 can have a certain strength to prevent the distance between the slit 212 and the outer peripheral edge from being too small to cause the connection to break, thereby avoiding affecting the reliability of the rotor core 200.

[0062] Optionally, in this embodiment, a plurality of rivet holes 220 are provided on the rotor core 200 , and the rivet holes 220 are evenly arranged on the surface of the rotor core 200 along the circumferential direction of the rotor core 200 .

[0063] Optionally, in this embodiment, a plurality of flow holes 230 are provided on the rotor core 200, and the flow holes 230 are evenly arranged on the surface of the rotor core 200 along the circumferential direction of the rotor core 200; the flow holes 230 are arranged around the shaft hole of the rotor core 200. The arrangement of the flow holes not only does not affect the efficiency of the motor operation, but also effectively increases the flow area of ​​the compressor. The requirement of the mechanical strength of the rotor can be met by increasing the number of the flow holes 230, and it can also avoid the situation where the magnetic field lines of the rotor main pole magnetic field form a closed loop through the flow holes 230, resulting in a significant increase in the magnetic resistance on the rotor side. Therefore, the rotor refrigerant flow area can be increased as much as possible while ensuring the performance and reliability of the motor, thereby promoting the circulation of the refrigerant in the compressor and achieving the purpose of cooling the rotor.

[0064] The present invention further provides a motor, comprising a stator and a rotor, wherein the rotor is rotatably disposed inside the stator.

[0065] Optionally, the stator is provided with stator slots, and the number of the stator slots is 9, 12 or 15; by reasonably setting the number of stator slots, it is helpful to reduce the number of turns of the winding in each stator slot, thereby reducing the demagnetization reverse magnetic field intensity generated by the motor being energized, and increasing the motor's anti-demagnetization ability.

[0066] Furthermore, the stator core of the stator is also formed by stacking multiple stator punchings. By setting the stator punchings and rotor punchings to be multiple, when processing the stator core and the rotor core, only multiple stator punchings or rotor punchings need to be processed, and then the multiple stator punchings and rotor punching parts are assembled into the stator core and the rotor core. Compared with processing a complete stator core and rotor core, the difficulty of processing the stator punching parts and the rotor punching parts is reduced, which facilitates the automated production of the stator core and the rotor core through an automated production line, thereby reducing production costs.

[0067] In one embodiment, the rotor core and the stator core can be made of different materials or shapes, so as to meet the requirements of different processing technologies of the stator and the rotor, which is conducive to selecting suitable punching sheets to form the rotor core and the stator core according to the performance requirements of the motor, thereby ensuring good performance of the electrode, and also improving the wide application range of the motor. In another embodiment, the stator punching sheets stacked into the stator core and the rotor punching sheets stacked into the rotor core are the same, which is conducive to the mass production of punching sheets and reduces manufacturing costs.

[0068] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiment. Since the compressor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0069] The present invention also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0070] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A rotor, characterized in that: include: permanent magnet; and The rotor core is provided with a plurality of structural groups, the structural groups include mounting grooves and n slits, n is a positive integer, the permanent magnet is arranged in the mounting groove, the slit is located between the mounting groove and the outer peripheral surface of the rotor core, and the width of the slit is L n , the width of the mounting groove is b, and the total width of the n slits is ∑L n , the ∑L n =L1+L2+…+L n , the ∑L n The relationship with b is 0.1≤∑L n / b≤0.

5.

2. The rotor according to claim 1, characterized in that The width L of the slit n The value range is: 0.4mm≤L n ≤2mm.

3. The rotor according to claim 1, characterized in that The width b of the mounting groove has a value range of: 5 mm ≤ b ≤ 18 mm; and / or The thickness of the mounting groove is h, and the value range of h is: 1.2mm≤h≤4.2mm.

4. The rotor according to claim 1, characterized in that The number of poles of the rotor core is 6, 8 or 10.

5. The rotor according to claim 1, characterized in that The mounting groove is arranged in a V shape; or The installation groove is arranged in a "I" shape.

6. The rotor according to claim 5, characterized in that The installation groove is in an axisymmetric shape, and the n slits in each structure group are in an axisymmetric shape relative to the symmetry axis of the installation groove; or The n slits in each structure group may also be in an asymmetric pattern.

7. The rotor according to claim 6, characterized in that The slit is arranged in a long strip shape; or The slits are arranged in a fan shape.

8. The rotor according to any one of claims 1 to 7, characterized in that The rotor core is provided with a plurality of rivet holes, and the rivet holes are evenly arranged on the surface of the rotor core along the circumferential direction of the rotor core; and / or The rotor core is provided with a plurality of flow holes, and the flow holes are evenly arranged on the surface of the rotor core along the circumferential direction of the rotor core.

9. A motor, characterized in that: The invention comprises a stator and a rotor as claimed in any one of claims 1 to 8, wherein the rotor is rotatably arranged inside the stator.

10. The motor according to claim 9, characterized in that The stator is provided with stator slots, and the number of the stator slots is 9, 12 or 15.

11. A compressor, characterized in that: Comprising a motor as claimed in claim 9 or 10.

12. A refrigeration device, characterized in that: Comprising the compressor of claim 11.

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