Rotor punching sheet, rotor assembly having same, motor, compressor and air conditioner

Abstract

The present invention relates to the technical field of compressors (40). Disclosed are a rotor punching sheet (1), a rotor assembly (20) having same, a motor (30), a compressor (40) and an air conditioner. The rotor punching sheet (1) comprises a punching sheet body (11), wherein permanent magnet slots (12) and fastener mounting holes (13) are formed in the punching sheet body (11), the permanent magnet slots (12) are suitable for accommodating permanent magnets (121), and the fastener mounting holes (13) are suitable for mounting fasteners. The fastener mounting holes (13) are configured to be multiple, the sum of the cross-sectional areas of the multiple fastener mounting holes (13) is S1, the permanent magnet slots (12) are configured to be multiple, and the sum of the cross-sectional areas of the multiple permanent magnet slots (12) is S2, S1 and S2 satisfying: 0.25≤S1 / S2≤0.85.

Description

Rotor laminations and rotor assemblies having them, motors, compressors and air conditioners.

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410496072.3, filed on April 24, 2024, entitled "Rotor laminations and rotor assemblies having the same, motors, compressors and air conditioners", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of compressor technology, and in particular to a rotor lamination and a rotor assembly having thereon, a motor, a compressor, and an air conditioner. Background Technology

[0004] As the core component of a compressor, the motor's structural design directly affects the compressor's overall performance, including its impact on vibration and noise, energy efficiency, and reliability. With increasing demands for quality of life, people are placing higher demands on the noise reduction capabilities of compressors. As the driving source of the compressor, optimizing and improving multiple motors helps to enhance noise reduction from the source. To improve user experience, the greater the motor's rigidity and the lower its noise, the better. The motor generates electricity through the cooperation of the stator and rotor; strengthening the rotor can effectively reduce motor noise. However, in current technology, due to unreasonable rotor structure design, it is difficult to achieve a balance between rigidity and magnetic properties. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, one object of the present invention is to provide a rotor lamination. The rotor lamination of the present invention satisfies 0.25≤S1 / S2≤0.85, where S1 is the sum of the cross-sectional areas of multiple fastener mounting holes, and S2 is the sum of the cross-sectional areas of multiple permanent magnet slots. Thus, the rotor lamination of the present invention improves rotor stiffness while reducing the impact on the maximum surface magnetism of the rotor, ensuring the rotor's magnetic properties, and reducing compressor noise by increasing rotor stiffness.

[0007] The present invention also proposes a rotor assembly having the above-mentioned rotor laminations.

[0008] The present invention also proposes an electric motor having the above-described rotor assembly.

[0009] The present invention also proposes a compressor having the above-mentioned motor.

[0010] The present invention also proposes an air conditioner having the above-mentioned compressor.

[0011] The rotor lamination according to the present invention includes: a lamination body, wherein a permanent magnet slot and a fastener mounting hole are formed on the lamination body, the permanent magnet slot is adapted to accommodate a permanent magnet, and the fastener mounting hole is adapted to install a fastener; wherein the fastener mounting hole is configured to be a plurality of holes and the sum of the cross-sectional areas of the plurality of fastener mounting holes is S1, the permanent magnet slot is configured to be a plurality of holes and the sum of the cross-sectional areas of the plurality of permanent magnet slots is S2, and satisfies: 0.25≤S1 / S2≤0.85.

[0012] According to the present invention, the rotor lamination has multiple fastener mounting holes formed on the lamination body, into which fasteners can be inserted. Multiple lamination bodies are stacked to form a rotor core. By setting multiple fasteners to cooperate with the multiple fastener mounting holes respectively, the multiple lamination bodies are fixed neatly. The sum of the cross-sectional areas of the multiple fastener mounting holes is S1. Multiple permanent magnet slots are formed on the lamination body, and the sum of the cross-sectional areas of the multiple permanent magnet slots is S2. The lamination body of the present application satisfies 0.25≤S1 / S2≤0.85, which can improve rotor stiffness, reduce compressor noise, and ensure rotor surface magnetism, thus ensuring rotor magnetic performance.

[0013] According to some embodiments of the present invention, the permanent magnet slots are configured to be a plurality of slots spaced apart in the circumferential direction, each of the permanent magnets being loaded with a permanent magnet to form a magnetic pole; wherein the number of the magnetic poles is P and satisfies: P≥8.

[0014] According to some embodiments of the present invention, the permanent magnet slots are arranged in m intervals around the circumference of the lamination body, and each magnetic pole is provided with k permanent magnet slots; and satisfying: m=k*P, where k is a positive integer.

[0015] According to some embodiments of the present invention, the fastener mounting holes are provided between at least a pair of adjacent permanent magnet slots.

[0016] According to some embodiments of the present invention, the lamination body is provided with a through hole in the thickness direction. The through holes are constructed in multiple ways and are spaced apart along the circumference of the lamination body. The sum of the areas of the multiple through holes is S3 and satisfies: 0.2≤S1 / S3≤0.4.

[0017] According to some embodiments of the present invention, the lamination body is provided with a rotor inner hole that extends through the thickness direction, the flow passage is provided on the outer periphery of the rotor inner hole, the minimum distance between the flow passage and the rotor inner hole is L1, the minimum width of the permanent magnet slot at the position where the permanent magnet is installed is L2, and satisfies: L1≥L2.

[0018] According to some embodiments of the present invention, the minimum distance between the fastener mounting hole and the permanent magnet groove is L3 and satisfies L3≥L2.

[0019] The rotor assembly according to another embodiment of the present invention is briefly described below.

[0020] The rotor assembly according to the present invention includes rotor laminations, wherein the rotor laminations are configured as a plurality of laminations stacked in the thickness direction, and each rotor lamination is configured as a rotor lamination as described in any of the above embodiments; a rotor end plate, wherein the rotor end plate is disposed at at least one end of the plurality of rotor laminations in the thickness direction; and a balance block, wherein the balance block is disposed on the side of the rotor end plate opposite to the rotor laminations and is fixedly connected to the plurality of rotor laminations by fasteners.

[0021] Since the rotor assembly according to the present invention includes rotor laminations as described in any of the above embodiments, and multiple rotor laminations are stacked to form a rotor core, the rotor core of the rotor assembly of the present application has higher strength and generates less noise when the rotor assembly rotates. Furthermore, rotor end plates are provided at one end or both ends of the rotor core thickness direction to limit the stacked rotor laminations and ensure tight stacking of the lamination bodies. A balance block is provided on the side of the rotor end plate away from the rotor laminations, and rivets pass through the balance block and the rotor laminations to fix the multiple stacked rotor laminations. By providing the balance block, the center of gravity position of the rotor assembly during rotation is adjusted, ensuring stable rotation of the rotor assembly and reducing compressor noise.

[0022] The following is a brief description of a motor according to another embodiment of the present invention.

[0023] The motor according to the present invention includes the rotor assembly in the above embodiments. Here, the motor housing is constructed as a permanent magnet motor consisting of a stator and a rotor. Since the motor according to the present invention is provided with the rotor assembly in the above embodiments, the rotor assembly has high strength, which is beneficial to reducing the noise of the motor. In addition, the surface magnetic flux of the rotor assembly is high, which ensures the operating efficiency of the motor.

[0024] The compressor according to another embodiment of the present invention is briefly described below.

[0025] The motor according to the present invention has the motor described in the above embodiments. Since the motor according to the present invention has the motor described in the above embodiments, the compressor according to the present invention generates less noise and has higher motor operating efficiency after being equipped with the motor described in the above embodiments, thus ensuring that the compressor has a higher cooling capacity.

[0026] An air conditioner according to another embodiment of the present invention is briefly described below.

[0027] The air conditioner according to the present invention includes the compressor in the above embodiments. Since the air conditioner according to the present invention is equipped with the compressor in the above embodiments, the noise generated by the air conditioner compressor is low, the cooling capacity of the compressor is high, the noise reduction performance of the air conditioner is better, and the cooling effect of the air conditioner is good.

[0028] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] Figure 1 is a schematic diagram of rotor laminations according to an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of rotor laminations according to another embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of rotor laminations according to another embodiment of the present invention;

[0032] Figure 4 is a schematic diagram of the structure of a rotor assembly according to an embodiment of the present invention;

[0033] Figure 5 is a schematic diagram of the axial end face of a rotor assembly according to an embodiment of the present invention;

[0034] Figure 6 is a schematic diagram of the axial end face of a motor according to an embodiment of the present invention;

[0035] Figure 7 is a schematic diagram of a compressor structure according to an embodiment of the present invention;

[0036] Figure 8 is a diagram showing the rotor stiffness and maximum surface magnetic flux variation of the rotor according to an embodiment of the present invention;

[0037] Figure 9 is a graph showing the changes in rotor stiffness and compressor cooling capacity according to an embodiment of the present invention. Embodiments of the present invention

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] The rotor laminations according to embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0040] The rotor lamination 1 according to the present invention includes a lamination body 11, on which permanent magnet slots 12 and fastener mounting holes 13 are formed. The permanent magnet slots 12 are adapted to accommodate permanent magnets 121, and the fastener mounting holes 13 are adapted to install fasteners. The fastener mounting holes 13 are configured to be multiple, and the sum of the cross-sectional areas of the multiple fastener mounting holes 13 is S1. The permanent magnet slots 12 are configured to be multiple, and the sum of the cross-sectional areas of the multiple permanent magnet slots 12 is S2, and satisfies: 0.25≤S1 / S2≤0.85.

[0041] As shown in Figures 1 to 3, a plurality of permanent magnet slots 12 are formed on the lamination body 11. The plurality of permanent magnet slots 12 are spaced apart around the center of the lamination body 11. A plurality of permanent magnets 121 can be inserted into the permanent magnet slots 12 to form a plurality of magnetic poles. A plurality of fastener mounting holes 13 are formed on the lamination body 11. The fastener mounting holes 13 can be used to install fasteners. The fasteners can be constructed as rivets 16, and the fastener mounting holes 13 can be constructed as rivet holes through which rivets 16 can pass. The lamination body 11 is fixed, and multiple fastener mounting holes 13 are circumferentially spaced on the lamination body 11 and located radially inside multiple permanent magnet slots 12. The sum of the cross-sectional areas of the multiple fastener mounting holes 13 is S1, and the sum of the cross-sectional areas of the multiple permanent magnet slots 12 is S2. For example, n fastener mounting holes 13 are provided on the lamination body 11, and the cross-sections of the n fastener mounting holes 13 are S11, S12, ..., S1n, respectively, and the sum of their cross-sectional areas is S1 = S11 + S12. +……+S1n, m permanent magnet slots 12 are provided on the lamination body 11, and the cross-sectional areas of the m permanent magnet slots 12 are S21, S22, ..., S2m, respectively. The sum of their cross-sectional areas is S2 = S21 + S22 + ... + S2m. The value of S1 / S2 satisfies 0.25 ≤ S1 / S2 ≤ 0.85, as shown in Figure 8. When 0.1 ≤ S1 / S2 ≤ 0.025, the rotor stiffness increases with the increase of the value of S1 / S2, and the rotor stiffness increases rapidly. The maximum surface magnetic field is in the decreasing stage and the rate of decrease is gradual. When 0.85≤S1 / S2≤1.15, the rotor stiffness increases slowly, while the maximum surface magnetic field of the rotor decreases rapidly. When 0.25≤S1 / S2≤0.85, the rotor stiffness increases significantly, and the maximum surface magnetic field of the rotor decreases slowly. Therefore, the rotor lamination 1 of this application can reduce the impact on the maximum surface magnetic field of the rotor while increasing the rotor stiffness, thus ensuring the magnetic performance of the rotor. By increasing the rotor stiffness, the noise of the compressor 40 is reduced.

[0042] According to the present invention, the rotor lamination 1 has a plurality of fastener mounting holes 13 formed on the lamination body 11, and fasteners can be inserted into the fastener mounting holes 13. The plurality of lamination bodies 11 are stacked to form a rotor core 203. By setting a plurality of fasteners to cooperate with the plurality of fastener mounting holes 13 respectively, the plurality of lamination bodies 11 are fixed neatly. The sum of the cross-sectional areas of the plurality of fastener mounting holes 13 is S1. A plurality of permanent magnet slots 12 are formed on the lamination body 11, and the sum of the cross-sectional areas of the plurality of permanent magnet slots 12 is S2. The lamination body 11 of the present application satisfies 0.25≤S1 / S2≤0.85, which can improve rotor stiffness, reduce rotor noise, and ensure rotor surface magnetism and rotor magnetic performance.

[0043] According to some embodiments of the present invention, the permanent magnet slots 12 are configured to be multiple and spaced apart in the circumferential direction, and each permanent magnet slot 12 is filled with a permanent magnet 121 to form a magnetic pole; wherein the number of magnetic poles is P and satisfies: P≥8.

[0044] As shown in Figures 1 to 3, multiple permanent magnet slots 12 are arranged circumferentially on the lamination body 11. One or more permanent magnets 121 can be inserted into the multiple permanent magnet slots 12 to form multiple magnetic poles. The number of magnetic poles P satisfies P≥8. Compared with the rotor of the motor 30 with 4 or 6 magnetic poles in the prior art, this application increases the number of magnetic poles on the lamination body 11. When the rotor in the motor 30 is matched with the stator 301, the power density of the rotor is improved due to the increase in magnetic poles, while the circumferential dimension of the lamination body 11 is fixed.

[0045] According to some embodiments of the present invention, the permanent magnet slots 12 are configured to be m spaced apart in the circumferential direction of the lamination body 11, and each magnetic pole is provided with k permanent magnet slots 12; and satisfy: m=k*P, where k is a positive integer.

[0046] Specifically, when a permanent magnet 121 is inserted into the permanent magnet slot 12, the number of magnetic poles generated is P=8. When k=1, the number of permanent magnet slots 12 is m=8. When k=2, the number of permanent magnet slots 12 is m=16. When k is other positive integers, the number of permanent magnet slots 12 changes accordingly. With a fixed number of magnetic poles, by limiting the number of magnetic poles, the number of permanent magnet slots 12 is a positive integer multiple of the number of magnetic poles. When the rotor and stator 301 rotate together, the strength of the rotor is improved, and deformation of the lamination body 11 is avoided.

[0047] According to some embodiments of the present invention, fastener mounting holes 13 are provided between at least a pair of adjacent permanent magnet slots 12.

[0048] As shown in Figures 1 to 3, the permanent magnet slot 12 is constructed in a V-shape. The first slot and the second slot are inclined relative to each other. The permanent magnet slots 12 are arranged in pairs. Fastener mounting holes 13 are provided between at least one pair of adjacent permanent magnet slots 12. Fasteners are inserted into the fastener mounting holes 13 to fix the multiple stacked lamination bodies 11, ensuring that the lamination bodies 11 are tightly stacked and reducing the noise generated during rotor rotation.

[0049] According to some embodiments of the present invention, a flow passage 14 is provided on the lamination body 11, which extends through the thickness direction. The flow passage 14 is constructed in multiple ways and is spaced apart along the circumference of the lamination body 11. The sum of the areas of the multiple flow passages 14 is S3 and satisfies: 0.2≤S1 / S3≤0.4.

[0050] Specifically, multiple flow holes 14 are provided on the lamination body 11. These multiple flow holes 14 are arranged circumferentially around the center of the lamination body 11. By providing multiple flow holes 14, the rotor and stator 301 in the motor 30 rotate in coordination to generate current, which drives the pump body in the compressor 40 to spray oil-containing gas. The oil-containing gas flows through the flow holes 14 and, under the action of centrifugal force, can enter the permanent magnet slot 12 to dissipate heat from the permanent magnet 121, preventing the permanent magnet 121 from overheating. The sum of the cross-sectional areas of the multiple flow holes 14 is S3. For example, t flow holes 14 can be provided on the lamination body 11, and the areas of the t flow holes 14 are S31, S32, ..., S3t, respectively. Define S3 = S31 + S32 + ... + S3t, as shown in Figure 9. When 0.1 ≤ S1 / S3 ≤ 0.2, as S... As the value of 1 / S3 increases, the rotor stiffness increases more rapidly. The cooling capacity of compressor 40 decreases as S1 / S3 increases, but the rate of decrease is relatively slow. When 0.4≤S1 / S3≤0.6, the increase in rotor stiffness is slow as the value of S1 / S3 increases, but the rate of decrease in cooling capacity of compressor 40 increases. Therefore, when 0.2≤S1 / S3≤0.4, the rotor stiffness is in an upward state as the value of S1 / S3 increases, and the decrease in cooling capacity of compressor 40 is slow. Thus, when 0.2≤S1 / S3≤0.4, the increase in rotor stiffness can be guaranteed, reducing the noise of compressor 40, while ensuring that the cooling capacity of compressor 40 is at a higher value, improving the cooling efficiency of compressor 40. In addition, by setting multiple flow holes 14, the permanent magnet 121 can be cooled, ensuring the safe use of permanent magnet 121.

[0051] According to some embodiments of the present invention, a rotor inner hole 15 extending in the thickness direction is provided on the lamination body 11, and a flow passage 14 is provided on the outer periphery of the rotor inner hole 15. The minimum distance between the flow passage 14 and the rotor inner hole 15 is L1, and the minimum width of the permanent magnet slot 12 at the position where the permanent magnet 121 is installed is L2, and satisfies: L1≥L2. Setting the minimum distance between the flow passage 14 and the peripheral wall of the rotor inner hole 15 to always be no less than the minimum width of the permanent magnet 121 installed in the permanent magnet slot 12 can increase the magnetic circuit width of the rotor lamination body 1, thereby improving the rotor surface magnetism.

[0052] According to some embodiments of the present invention, the minimum distance between the fastener mounting hole 13 and the permanent magnet slot 12 is L3 and satisfies L3≥L2. The fastener mounting hole 13 can be constructed as a rivet hole, and the fastener can be constructed as a rivet 16. Multiple lamination bodies 11 are stacked to form a rotor core 203, and the multiple lamination bodies 11 are fixed into a whole by the rivet 16 cooperating with the rivet hole. The minimum distance L3 between the rivet hole and the permanent magnet slot 12 is always greater than the minimum width of the position of the permanent magnet 121 installed in the permanent magnet slot 12, which is beneficial to enhance the rotor stiffness and reduce the noise of the compressor 40.

[0053] The rotor assembly 20 according to the present invention is briefly described below.

[0054] The rotor assembly 20 according to the present invention includes rotor laminations 1, rotor end plates 201, and balance blocks 202. The rotor laminations 1 are configured as a plurality of stacked laminations in the thickness direction, and each rotor lamination 1 is configured as the rotor lamination 1 described in any of the above embodiments. The rotor end plates 201 are disposed at at least one end of the plurality of rotor laminations 1 in the thickness direction. The balance blocks 202 are disposed on the side of the rotor end plates 201 away from the rotor laminations 1 and are fixedly connected to the plurality of rotor laminations 1 by fasteners.

[0055] Since the rotor assembly 20 according to the present invention includes the rotor laminations 1 as described in any of the above embodiments, and multiple rotor laminations 1 are stacked to form a rotor core 203, the rotor core 203 of the rotor assembly 20 of the present application has higher strength, and the noise generated when the rotor assembly 20 rotates is lower. Furthermore, a rotor end plate 201 is provided at one end or both ends of the rotor core 203 in the thickness direction to limit the stacked rotor laminations 1 and ensure that the lamination bodies 11 are tightly stacked. A balance block 202 is provided on the side of the rotor end plate 201 away from the rotor laminations 1, and rivets 16 pass through the balance block 202 and the rotor laminations 1 to fix the multiple stacked rotor laminations 1. By providing the balance block 202, the center of mass position of the rotor assembly 20 during rotation is adjusted, ensuring the rotation stability of the rotor assembly 20 and reducing the noise generated by the rotor assembly 20.

[0056] The motor 30 according to the present invention is briefly described below.

[0057] The motor 30 according to the present invention includes the rotor assembly 20 in the above embodiments. The housing structure of the motor 30 is a permanent magnet motor composed of a stator 301 and a rotor. Since the motor 30 according to the present invention is provided with the rotor assembly 20 in the above embodiments, the rotor assembly 20 has high strength, which is beneficial to reducing the noise of the motor 30. In addition, the rotor assembly 20 has high surface magnetism, which ensures the operating efficiency of the motor 30.

[0058] The structure of the stator 301 and the rotor after assembly is shown in Figure 6. The stator 301 includes a stator core 303 and a stator winding 302, and the rotor is constructed as the rotor assembly 20 described in the above embodiment.

[0059] The compressor 40 according to the present invention is briefly described below.

[0060] The motor 30 according to the present invention has the motor 30 described in the above embodiments. Since the motor 30 according to the present invention has the motor 30 described in the above embodiments, after the compressor 40 according to the present invention is equipped with the motor 30 described in the above embodiments, the noise generated by the compressor 40 during operation is small, the operating efficiency of the motor 30 is high, and the compressor 40 has a high cooling capacity.

[0061] In some embodiments, the compressor 40 structure of this application is shown in FIG7. A base 402 is provided at the bottom of the compressor housing 401 for supporting and fixing the compressor housing 401. The motor 30 described in the above embodiment is provided inside the compressor housing 401.

[0062] The air conditioner according to the present invention is briefly described below.

[0063] The air conditioner according to the present invention includes the compressor 40 in the above embodiments. Since the air conditioner according to the present invention is equipped with the compressor 40 in the above embodiments, the air conditioner compressor 40 generates less noise, has a higher cooling capacity, better noise reduction performance, and better cooling effect.

[0064] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A rotor lamination, characterized in that, include: A lamination body has permanent magnet slots and fastener mounting holes formed on it. The permanent magnet slots are adapted to accommodate permanent magnets, and the fastener mounting holes are adapted to install fasteners. The fastener mounting holes are configured to be multiple, and the sum of the cross-sectional areas of the multiple fastener mounting holes is S1. The permanent magnet slots are configured to be multiple, and the sum of the cross-sectional areas of the multiple permanent magnet slots is S2, and the following condition is met: 0.25≤S1 / S2≤0.

85.

2. The rotor lamination according to claim 1, characterized in that, The permanent magnet slots are configured to be multiple slots spaced apart in the circumferential direction, and each slot contains a permanent magnet to form a magnetic pole; wherein the number of magnetic poles is P and satisfies: P≥8.

3. The rotor lamination according to claim 2, characterized in that, The permanent magnet slots are arranged at intervals of m in the circumferential direction of the lamination body, and each magnetic pole is provided with k permanent magnet slots; and satisfy: m=k*P, where k is a positive integer.

4. The rotor lamination according to claim 3, characterized in that, The fastener mounting holes are provided between at least one pair of adjacent permanent magnet slots.

5. The rotor lamination according to any one of claims 1-4, characterized in that, The lamination body is provided with a through hole in the thickness direction. The through holes are constructed in multiple ways and are spaced apart along the circumference of the lamination body. The sum of the areas of the multiple through holes is S3 and satisfies: 0.2≤S1 / S3≤0.

4.

6. The rotor lamination according to claim 5, characterized in that, The lamination body is provided with a rotor inner hole that extends through the thickness direction. The flow passage is provided on the outer periphery of the rotor inner hole. The minimum distance between the flow passage and the rotor inner hole is L1. The minimum width of the permanent magnet slot at the position where the permanent magnet is installed is L2, and satisfies: L1≥L2.

7. The rotor lamination according to claim 5 or 6, characterized in that, The minimum distance between the fastener mounting hole and the permanent magnet groove is L3 and satisfies L3≥L2.

8. A rotor assembly, characterized in that, include: Rotor laminations, wherein the rotor laminations are configured as a plurality of laminations stacked in the thickness direction, and each of the rotor laminations is configured as the rotor lamination according to any one of claims 1-7; A rotor end plate, wherein the rotor end plate is disposed at at least one end of the plurality of rotor laminations in the thickness direction; A balance block is disposed on the side of the rotor end plate away from the rotor laminations and is fixedly connected to a plurality of rotor laminations by fasteners.

9. An electric motor, characterized in that, Includes the rotor assembly as described in claim 8.

10. A compressor, characterized in that, Includes the motor as described in claim 9.

11. An air conditioner, characterized in that, Includes the compressor as described in claim 10.

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