Rotor, motor and compressor

Abstract

The utility model discloses a rotor, motor and compressor relates to motor equipment technical field, rotor includes permanent magnet and rotor iron core, rotor iron core has rotation axis, rotor iron core includes a plurality of laminations, the plurality of laminations are laminated along rotation axis, each lamination forms a plurality of magnetic slot, and the plurality of magnetic slot forms the permanent magnet. The magnetic slots of the plurality of laminations are communicated with each other along the direction of the rotating axis so as to form an accommodating slot for accommodating the permanent magnet; each lamination forms a magnetic bridge or a communication groove at one magnetic groove, the magnetic bridge is located at the edge of the lamination and blocks the magnetic groove, and the communication groove is communicated with the magnetic groove and the external space; the number of the laminations is defined as N, the number of the magnetic grooves in every two adjacent containing grooves is 2N, the number of the magnetic bridges is M, and the ratio of M to 2N ranges from 0.2 to 0.5. The utility model aims to reduce the magnetic flux leakage of the rotor iron core on the basis of ensuring the structural strength through the rotor iron core so as to improve the motor efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of motor equipment, and particularly relates to a rotor, a motor and a compressor. Background Art

[0002] The rotor core is formed by laminating laminations of a certain size in the axial direction, and magnetic slots for placing permanent magnets are formed in the laminations, so that the permanent magnets are built into the rotor core to form a rotor. In a common rotor core, magnetic bridges will be formed at the magnetic slots, but the magnetic bridges will cause magnetic leakage of the permanent magnets. To reduce magnetic leakage, part of the magnetic bridges will be disconnected to form a slotted connection between the magnetic slots and the external space. However, the disconnection of the magnetic bridges will also affect the overall structural strength of the rotor core. At present, it is impossible to obtain less magnetic leakage and higher motor efficiency on the basis of ensuring that the rotor core has sufficient structural strength. Summary of the Utility Model

[0003] The main object of the utility model is to propose a rotor, a motor and a compressor, aiming to reduce the magnetic leakage of the rotor core on the basis of ensuring the structural strength, so as to improve the motor efficiency.

[0004] To achieve the above object, the utility model proposes a rotor, which includes a permanent magnet and a rotor core. The rotor core has a rotation axis, and the rotor core includes:

[0005] A plurality of laminations, the plurality of laminations are stacked along the rotation axis, each lamination forms a plurality of magnetic slots, and the magnetic slots of the plurality of laminations are communicated with each other along the rotation axis direction to form a receiving groove for accommodating the permanent magnet;

[0006] Each lamination forms a magnetic bridge or a communication groove at one magnetic slot. The magnetic bridge is located at the edge of the lamination and blocks the magnetic slot, and the communication groove communicates the magnetic slot and the external space;

[0007] Define the number of the laminations as N, the number of the magnetic slots in two adjacent receiving grooves is 2N, and the number of the magnetic bridges is M. The ratio of M to 2N is between 0.2 and 0.5.

[0008] In one embodiment, the rotor core includes a first lamination and a second lamination. A part of the plurality of laminations is the first lamination, and the first lamination includes a plurality of magnetic bridges, and each magnetic bridge correspondingly blocks one magnetic slot;

[0009] Another part of the plurality of laminations is the second lamination, and the second lamination is provided with a plurality of communication grooves, and each communication groove communicates one magnetic slot and the external space.

[0010] In one embodiment, the first laminated sheet and the second laminated sheet are alternately laminated along the direction of the rotation axis; alternatively, three second laminated sheets are included between every two first laminated sheets.

[0011] In one embodiment, the rotor core further includes a third laminated sheet, and a part of the plurality of laminated sheets is the third laminated sheet;

[0012] For two adjacent magnetic slots in the third laminated sheet, one magnetic slot is communicated with the communication slot, and the other magnetic slot is blocked by the magnetic bridge.

[0013] In one embodiment, the plurality of third laminated sheets are sequentially laminated along the direction of the rotation axis;

[0014] For the plurality of magnetic slots corresponding to the same accommodation slot, the magnetic bridge and the communication slot are alternately arranged along the direction of the rotation axis.

[0015] In one embodiment, at least two connected third laminated sheets are respectively provided at both ends of the second laminated sheet along the direction of the rotation axis.

[0016] In one embodiment, the ratio among the first laminated sheet, the second laminated sheet, and the third laminated sheet is 1:4:2;

[0017] The second laminated sheet and the third laminated sheet are connected to each other and symmetrically arranged at both ends of the first laminated sheet along the direction of the rotation axis.

[0018] In one embodiment, the ratio among the first laminated sheet, the second laminated sheet, and the third laminated sheet is 2:2:3;

[0019] The third laminated sheets are connected to each other, and the first laminated sheet and the second laminated sheet are connected to each other and located at both ends of the third laminated sheet along the direction of the rotation axis.

[0020] In one embodiment, the plurality of laminated sheets are connected by rivets or riveting along the direction of the rotation axis.

[0021] The present utility model also provides a motor, including the above rotor.

[0022] The present utility model also provides a compressor, including the above motor.

[0023] The rotor of the technical solution of the present utility model includes a permanent magnet and a rotor core. The rotor core has a rotation axis. The rotor core includes a plurality of laminations, and the plurality of laminations are stacked in sequence along the rotation axis. Each lamination forms a plurality of magnetic slots, and each lamination forms a magnetic bridge or a communication slot at one magnetic slot. The magnetic bridge is located at the edge of the lamination and blocks the magnetic slot, and the communication slot communicates the magnetic slot with the external space; the magnetic slots of the plurality of laminations communicate with each other along the rotation axis direction to form a receiving slot for accommodating the permanent magnet. Define the number of laminations as N, the number of magnetic slots in two adjacent receiving slots is 2N, and the number of magnetic bridges is M. The ratio of M to 2N is between 0.2 and 0.5. By stacking and connecting the laminations with magnetic bridges or communication slots in sequence along the rotation axis, the rotor core has different numbers of magnetic bridges and communication slots on the periphery of the receiving slot. The magnetic bridges can ensure that the rotor core has a certain structural strength, and the communication slots can reduce the magnetic leakage at the magnetic slots of the rotor core. By limiting the ratio of the magnetic bridges to the number of magnetic slots in two adjacent receiving slots to between 0.2 and 0.5, not only can the structural strength of the rotor core be ensured, but also as many communication slots as possible can be set to reduce magnetic leakage and improve the efficiency of the motor. Moreover, different ratios can be set according to different models of motors to improve the applicability of the rotor. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0025] Figure 1 It is a relationship image of motor efficiency, average structural strength of magnetic bridges and fracture rate in an embodiment of the present utility model;

[0026] Figure 2 It is a schematic structural diagram of the first lamination in an embodiment of the present utility model;

[0027] Figure 3 It is a schematic structural diagram of the second lamination in an embodiment of the present utility model;

[0028] Figure 4 It is a schematic structural diagram of the third lamination in an embodiment of the present utility model;

[0029] Figure 5 It is a schematic structural diagram of the first lamination in another embodiment of the present utility model;

[0030] Figure 6 It is a schematic structural diagram of the rotor core in an embodiment of the present utility model;

[0031] Figure 7 is Figure 6 a schematic cross-sectional view of the rotor core in

[0032] Figure 8 a schematic cross-sectional view of the rotor core in another embodiment of the present utility model;

[0033] Figure 9 a schematic cross-sectional view of the rotor core in yet another embodiment of the present utility model;

[0034] Figure 10 a schematic cross-sectional view of the rotor core in still another embodiment of the present utility model;

[0035] Figure 11 a schematic structural view of the rotor core in still another embodiment of the present utility model;

[0036] Figure 12 is Figure 11 a schematic cross-sectional view of the rotor core in

[0037] Figure 13 a schematic cross-sectional view of the rotor core in still another embodiment of the present utility model.

[0038] Explanation of the reference numerals in the drawings:

[0039] 100, rotor core; 1a, magnetic slot; 1b, magnetic bridge; 1c, connecting slot; 1d, rivet hole; 1e, rivet buckle bend; 1, first lamination; 2, second lamination; 3, third lamination; 31, third positive lamination; 32, third negative lamination.

[0040] The realization of the object, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0041] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0042] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0044] To achieve the above object, please refer to Figures 1 to 7 As shown, the present utility model provides a rotor, which includes a permanent magnet and a rotor core 100. The rotor core 100 has a rotation axis. The rotor core 100 includes a plurality of laminations stacked along the rotation axis. Each lamination forms a plurality of magnetic slots 1a. The magnetic slots 1a of the plurality of laminations communicate with each other along the rotation axis direction to form a receiving groove for receiving the permanent magnet. Each lamination forms a magnetic bridge 1b or a communication groove 1c at a magnetic slot 1a. The magnetic bridge 1b is located at the edge of the lamination and blocks the magnetic slot 1a. The communication groove 1c communicates the magnetic slot 1a with the external space. Define the number of laminations as N, the number of magnetic slots 1a in two adjacent receiving grooves as 2N, and the number of magnetic bridges 1b as M. The ratio of M to 2N is between 0.2 and 0.5.

[0045] In this embodiment, as Figure 6 shown, the rotor core 100 is applied to the rotor of an electric motor. The rotor core 100 includes a plurality of stacked laminations, which are also called rotor punching sheets. The rotor punching sheets are silicon steel sheets and are circular in shape. The rotor core 100 has a rotation axis, which coincides with the rotation axis of the rotor relative to the stator and the rotation axis of the electric motor having the rotor. By sequentially stacking a plurality of laminations along the rotation axis, the rotor core 100 forms a core structure with a cylindrical outer surface.

[0046] Meanwhile, on each lamination, a plurality of magnetic slots 1a are formed by stamping or cutting. The plurality of magnetic slots 1a are centrally symmetrically distributed around the rotation axis on one lamination, and each magnetic slot 1a is arranged to penetrate the lamination along the direction of the rotation axis. Each magnetic slot 1a of two adjacent laminations is correspondingly arranged and correspondingly communicated, so that the plurality of magnetic slots 1a in the direction of the rotation axis of the entire rotor core 100 together form a receiving groove for receiving a permanent magnet. The permanent magnet can be a rare earth permanent magnet, such as a neodymium iron boron permanent magnet, or a non-rare earth permanent magnet, such as a ferrite permanent magnet, which is not limited herein. It is preferably to use a mixture of rare earth permanent magnets and ferrite permanent magnets, which can not only ensure that the rotor outputs sufficient magnetic flux, but also reduce the use of high-grade permanent magnets such as rare earth materials and reduce costs.

[0047] Further, in an embodiment of the present invention, the arrangement of the above-mentioned magnetic slots 1a on the lamination can be in a straight line shape, that is, around the rotation axis of the lamination, it is arranged in a long strip shape at the edge of the lamination; it can also be in a V shape, that is, one end of the magnetic slot 1a starts from the rotation axis of the lamination and extends towards the edge of the lamination, and the extending directions of the slot bodies of every two magnetic slots 1a form an included angle to form a V shape; it can also be a Spoke structure, that is, one end of the magnetic slot 1a starts from the rotation axis of the lamination and extends towards the edge of the lamination, and a plurality of magnetic slots 1a are arranged around the rotation axis in a spoke-like radial pattern. Of course, it can also be a combination of at least two of the above structural forms. At the same time, the shape of the permanent magnet is the same as the shape of the above-mentioned magnetic slot 1a and is embedded in the magnetic slot 1a to jointly form a rotor with the rotor core 100.

[0048] In this embodiment, as Figures 2 to 5 shown, at one end (side) of the magnetic slot 1a facing or adjacent to the edge of the lamination, the magnetic slot 1a can be an open structure, that is, a part of the structure of the lamination is broken so that the magnetic slot 1a is connected to the external space to form an open structure. At this time, a communication groove 1c is formed at the broken part of the lamination to connect the magnetic slot 1a and the external space; or, at one end (side) of the magnetic slot 1a facing or adjacent to the edge of the lamination, a magnetic bridge 1b is arranged on the lamination to block the magnetic slot 1a so that the magnetic slot 1a is a closed slot structure; or, in the same lamination, one of the two adjacent magnetic slots 1a can be provided with a magnetic bridge 1b, and the other of the two adjacent magnetic slots 1a can be provided with a communication groove 1c.

[0049] It can be understood that on the same lamination, magnetic bridges 1b can be formed at the edges of each magnetic slot 1a adjacent to the lamination, so that each magnetic slot 1a on the lamination is a closed slot structure. Alternatively, communication slots 1c can be formed at the edges of each magnetic slot 1a adjacent to the lamination, so that each magnetic slot 1a is connected to the external space to form an open slot. When multiple laminations are stacked relative to each other along the rotation axis to form the rotor core 100, part of the side wall of the rotor core 100 is the magnetic bridge 1b and part is the communication slot 1c.

[0050] Among them, the setting of the magnetic bridge 1b can enhance the structural strength of each lamination, thereby enhancing the overall structural strength of the rotor core 100. However, due to the existence of the magnetic bridge 1b, when the permanent magnet is arranged in the magnetic slot 1a, the magnetic lines of force generated by the permanent magnet can diffuse outward through the magnetic bridge 1b, resulting in magnetic leakage. Magnetic leakage will reduce the magnetic concentration ability of the permanent magnet and reduce the magnetic flux of the entire rotor, thereby reducing the performance of the motor with this rotor.

[0051] Based on this, setting the communication slot 1c on the lamination can prevent the magnetic lines of force generated by the permanent magnet in the magnetic slot 1a from diffusing outward through the communication slot 1c, thereby effectively improving the magnetic concentration ability of the rotor, enhancing the magnetic flux of the rotor, and improving the torque performance of the motor with this rotor.

[0052] At the same time, define the number of laminations as N, the number of magnetic slots 1a in two adjacent receiving slots as 2N, and the number of magnetic bridges 1b as M. The ratio of M to 2N is between 0.2 and 0.5, and the ratio of M to 2N can also be defined as the fracture rate.

[0053] From Figure 1 it can be seen that 400 Mpa is the maximum strength requirement for the rotor magnetic bridge 1b. When the average strength of the rotor magnetic bridge 1b exceeds 400 Mpa, the rotor magnetic bridge 1b has a risk of fracture, and the entire rotor core 100 has a risk of failure. Therefore, on the basis of ensuring the structural strength of the rotor core 100, that is, on the basis that the average strength of the rotor magnetic bridge 1b does not exceed 400 Mpa, select the maximum value of the ratio of M to 2N (fracture rate) as 0.5. And considering that the motor with this rotor core 100 has a higher efficiency, the minimum value of the ratio of M to 2N (fracture rate) is 0.2. Moreover, as the ratio of M to 2N (fracture rate) continuously increases, that is, on the basis of keeping the number of magnetic slots 1a fixed, the number of magnetic bridges 1b continuously decreases and the number of communication slots 1c continuously increases, the magnetic leakage of the rotor core 100 gradually decreases, and the efficiency of the motor continuously increases.

[0054] The rotor of this technical solution includes a permanent magnet and a rotor core 100. The rotor core 100 has a rotation axis. The rotor core 100 includes a plurality of laminations, and the plurality of laminations are sequentially stacked along the rotation axis. A plurality of magnetic slots 1a are formed on each lamination. Each lamination forms a magnetic bridge 1b or a communication slot 1c at a magnetic slot 1a. The magnetic bridge 1b is located at the edge of the lamination and seals the magnetic slot 1a. The communication slot 1c connects the magnetic slot 1a and the external space. The magnetic slots 1a of the plurality of laminations are connected to each other along the rotation axis direction to form a receiving slot for accommodating the permanent magnet. Define the number of laminations as N, the number of magnetic slots 1a in two adjacent receiving slots is 2N, and the number of magnetic bridges 1b is M. The ratio of M to 2N is between 0.2 and 0.5. By sequentially stacking and connecting the laminations with magnetic bridges 1b or communication slots 1c along the rotation axis, the rotor core 100 has different numbers of magnetic bridges 1b and communication slots 1c on the periphery of the receiving slot. The magnetic bridge 1b can ensure that the rotor core 100 has a certain structural strength, and the communication slot 1c can reduce the magnetic leakage at the magnetic slot 1a of the rotor core 100. By limiting the ratio of the magnetic bridge 1b to the number of magnetic slots 1a in two adjacent receiving slots to between 0.2 and 0.5, not only can the communication slots 1c be set as many as possible to reduce magnetic leakage and improve the motor efficiency on the basis of ensuring the structural strength of the rotor core 100, but also different ratios can be set according to different types of motors to improve the applicability of the rotor core 100.

[0055] In one embodiment, as Figure 2 、 Figure 3 and Figure 5 shown, the rotor core 100 includes a first lamination 1 and a second lamination 2. A part of the plurality of laminations is the first lamination 1, and the first lamination 1 includes a plurality of magnetic bridges 1b. Each magnetic bridge 1b correspondingly seals a magnetic slot 1a. Another part of the plurality of laminations is the second lamination 2, and the second lamination 2 is provided with a plurality of communication slots 1c. Each communication slot 1c connects a magnetic slot 1a and the external space.

[0056] In this embodiment, among the plurality of laminations forming the rotor core 100, a part is the first lamination 1 and another part is the second lamination 2. Among them, the first lamination 1 forms a magnetic bridge 1b at the edge of each magnetic slot 1a so that the magnetic bridge 1b seals the magnetic slot 1a, and the second lamination 2 forms a communication slot 1c at the edge of each magnetic slot 1a so that the magnetic slot 1a is connected to the external space.

[0057] It can be understood that dividing the laminations into a first lamination 1 provided with a plurality of magnetic bridges 1b and a second lamination 2 provided with a plurality of connecting grooves 1c can facilitate the combination and arrangement of the first lamination 1 and the second lamination 2, so that a plurality of first laminations 1 and a plurality of second laminations 2 are located at different positions of the same rotor core 100, so as to reasonably arrange the magnetic bridges 1b and the connecting grooves 1c for the plurality of magnetic slots 1a in the same receiving groove, or reasonably arrange the magnetic bridges 1b and the connecting grooves 1c for the plurality of magnetic slots 1a in two adjacent receiving grooves, so that the ratio of M to 2N (breaking rate) is maintained at 0.2 - 0.5 (including the end values at both 0.2 and 0.5), so that on the basis of having a certain structural strength, the rotor core 100 can also reduce magnetic leakage and has a better magnetic focusing effect, so as to improve the efficiency of the motor having the rotor core 100.

[0058] In one embodiment, as Figure 6 and Figure 7 shown, the first lamination 1 and the second lamination 2 are alternately stacked along the rotation axis direction.

[0059] It can be understood that a plurality of first laminations 1 and a plurality of second laminations 2 are alternately stacked in sequence along the rotation axis direction, that is, one second lamination 2 is provided between two adjacent first laminations 1, and one first lamination 1 is provided between two adjacent second laminations 2, and for the adjacent first lamination 1 and the second lamination 2, their magnetic slots 1a are correspondingly arranged and communicated with each other, and the magnetic bridge 1b of the first lamination 1 is correspondingly arranged with the connecting groove 1c of the second lamination 2. Taking seven laminations as an example, there are three first laminations 1 and four second laminations 2, so that in every two adjacent receiving grooves, the number M of all the magnetic bridges 1b is 6, the number 2N of all the magnetic slots 1a is 14, and the ratio of M to 2N (breaking rate) is 6 / 14 = 0.43. On the basis of ensuring that the rotor core 100 has a certain structural strength, the magnetic leakage of the rotor core 100 can also be reduced.

[0060] In one embodiment, as Figure 8 shown, three second laminations 2 are included between every two first laminations 1.

[0061] It can be understood that three second laminations 2 are arranged between every two first laminations 1. Taking seven laminations as an example, one first lamination 1 is arranged at each end of the three second laminations 2 along the rotation axis, and one second lamination 2 is arranged on the side of the first lamination 1 away from the three second laminations 2, so that the seven laminations include two first laminations 1 and five second laminations 2, so that in every two adjacent accommodation grooves, the number M of all magnetic bridges 1b is 4, and the number 2N of all magnetic grooves 1a is 14. The ratio (breaking rate) of M to 2N is 4 / 14 = 0.285. On the basis of ensuring a certain structural strength of the rotor core 100, the magnetic leakage of the rotor core 100 can also be reduced.

[0062] In one embodiment, as Figure 4 and Figure 9 shown, the rotor core 100 further includes a third lamination 3, and a part of the multiple laminations is the third lamination 3; for two adjacent magnetic grooves 1a in the third lamination 3, one magnetic groove 1a is communicated with the communication groove 1c, and the other magnetic groove 1a is blocked by the magnetic bridge 1b.

[0063] In this embodiment, the multiple laminations are divided into three parts, one part is the first lamination 1, one part is the second lamination 2, and one part is the third lamination 3. In the two adjacent magnetic grooves 1a of the third lamination 3, one magnetic groove 1a is provided with a magnetic bridge 1b at the edge of the lamination, and the other magnetic groove 1a is provided with a communication groove 1c at the edge of the lamination.

[0064] It can be understood that compared with the structure where all the magnetic grooves 1a in the first lamination 1 are correspondingly provided with magnetic bridges 1b, and all the magnetic grooves 1a in the second lamination 2 are correspondingly provided with communication grooves 1c, in the third lamination 3, a part of the magnetic grooves 1a are provided with magnetic bridge 1b structures, and the other part is provided with communication groove 1c structures, so that on the basis of ensuring a certain structural strength of the third lamination 3 itself, the magnetic leakage can be effectively reduced, and multiple third laminations 3 can also be alternately stacked to form a rotor core 100 with alternately arranged magnetic bridges 1b and communication grooves 1c, and the ratio (breaking rate) of M to 2N is between 0.2 and 0.5 (including the endpoint values at both 0.2 and 0.5). Of course, it can also be formed by alternately stacking the third lamination 3 and the first lamination 1, or the third lamination 3 and the second lamination 2, or the third lamination 3, the first lamination 1 and the second lamination 2 together to form a rotor core 100 with different arrangements and combinations, and different breaking rates, so as to adapt to motors of different sizes, rotors with different magnetic strengths, etc., and improve the versatility and adaptability of the rotor core 100.

[0065] In one embodiment, as Figure 9As shown, a plurality of third laminations 3 are stacked in sequence along the direction of the rotation axis; for the plurality of magnetic slots 1a, magnetic bridges 1b, and communication slots 1c corresponding to the same receiving slot, they are arranged alternately along the direction of the rotation axis.

[0066] It can be understood that a plurality of third laminations 3 are stacked in sequence along the direction of the rotation axis to form a rotor core 100, and the magnetic bridges 1b and communication slots 1c in the same receiving slot are also arranged alternately in sequence along the direction of the rotation axis, that is, on both sides of the rotation axis of a magnetic bridge 1b are communication slots 1c, and on both sides of the rotation axis of a communication slot 1c are magnetic bridges 1b.

[0067] Among them, the third lamination 3 includes a third positive lamination 31 and a third negative lamination 32. The third negative lamination 32 is formed by flipping the third positive lamination 31 by one face to form the third lamination 3, so that the position where the magnetic bridge 1b was originally set on the third positive lamination 31 forms a communication slot 1c on the flipped third negative lamination 32, and the position where the communication slot 1c was originally set on the third positive lamination 31 forms a magnetic bridge 1b on the flipped third negative lamination 32. For example, when the first third positive lamination 31 is used as the installation substrate, the third negative lamination 32 and the third positive lamination 31 are stacked in sequence to make the plurality of magnetic slots 1a, magnetic bridges 1b, and communication slots 1c corresponding to the same receiving slot arranged alternately along the direction of the rotation axis. Taking seven third laminations 3 as an example, which includes three third positive laminations 31 and four third negative laminations 32, or three third negative laminations 32 and four third positive laminations 31, so that in every two adjacent receiving slots, the number M of all magnetic bridges 1b is 7, the number 2N of all magnetic slots 1a is 14, and the ratio (breaking rate) of M to 2N is 7 / 14 = 0.5. On the basis of ensuring a certain structural strength of the rotor core 100, the magnetic leakage of the rotor core 100 can also be reduced.

[0068] In an embodiment, as Figure 10 shown, at least two connected third laminations 3 are respectively provided at both ends of the second lamination 2 along the direction of the rotation axis.

[0069] In this embodiment, at least two connected third laminations 3 are respectively provided on the upper and lower surfaces of the second lamination 2, that is, at both ends along the direction of the rotation axis, that is, at least two connected third laminations 3 are connected to each surface.

[0070] It can be understood that, taking the number of laminations as 5 as an example, that is, two third laminations 3 are arranged on one side surface of a second lamination 2, the number 2N of all magnetic slots 1a is 10, and the ratio (breaking rate) of M to 2N is 4 / 10 = 0.4. Taking the number of laminations as 7 as an example, that is, three third laminations 3 are arranged on one side surface of a second lamination 2, the number 2N of all magnetic slots 1a is 14, and the ratio (breaking rate) of M to 2N is 6 / 14 = 0.428. On the basis of ensuring a certain structural strength of the rotor core 100, the magnetic leakage of the rotor core 100 can also be reduced, and the motor efficiency can be further improved.

[0071] At the same time, the third laminations 3 arranged on the same side of the second lamination 2 are of the same type, that is, all third positive laminations 31 are on one side of the second lamination 2, and all third negative laminations 32 are on the other side of the second lamination 2. With such an arrangement, it can be ensured that the magnetic bridges 1b in two adjacent receiving slots are centrosymmetric in position, so that the rotor core 100 has a stable torque to ensure the dynamic balance performance of the rotor core 100 and the rotor having the rotor core 100.

[0072] In an embodiment, as Figure 11 and Figure 12 shown, the ratio among the first lamination 1, the second lamination 2, and the third lamination 3 is 1:4:2; the second lamination 2 and the third lamination 3 are connected to each other and symmetrically arranged at both ends of the first lamination 1 along the rotation axis direction.

[0073] It can be understood that limiting the ratio among the first lamination 1, the second lamination 2, and the third lamination 3 to 1:4:2 can further increase the number of communication slots 1c, reduce the breaking rate, and effectively reduce the magnetic leakage of the rotor core 100. Specifically, taking seven laminations as an example, which include one first lamination 1, four second laminations 2, and two third laminations 3, so that in every two adjacent receiving slots, the number M of all magnetic bridges 1b is 4, the number 2N of all magnetic slots 1a is 14, and the ratio (breaking rate) of M to 2N is 4 / 14 = 0.285. On the basis of ensuring a certain structural strength of the rotor core 100, the magnetic leakage of the rotor core 100 can be reduced as much as possible.

[0074] Meanwhile, by reasonably arranging the positions of the first lamination 1, the second lamination 2, and the third lamination 3, the rotor core 100 in this embodiment has better connection strength. For example, the first lamination 1 is arranged at the middle position, two second laminations 2 are respectively arranged on both sides of the first lamination 1, and the third lamination 3 is arranged on the side of the second lamination 2 away from the first lamination 1. Moreover, one side of the first lamination 1 is set as the third positive lamination 31, and the other side of the first lamination 1 is set as the third lamination 3, so as to ensure that the second lamination 2 structure without the magnetic bridge 1b is located between at least part of the first lamination 1 and the third lamination 3 with the magnetic bridge 1b, effectively improving the connection strength of the rotor core 100 in this embodiment, and also having good symmetry to ensure the dynamic balance performance of the rotor core 100 and the rotor with the rotor core 100.

[0075] In one embodiment, as Figure 13 shown, the ratio among the first lamination 1, the second lamination 2, and the third lamination 3 is 2:2:3; the third laminations 3 are connected to each other, and the first lamination 1 and the second lamination 2 are connected to each other and located at both ends of the third lamination 3 along the rotation axis direction.

[0076] It can be understood that limiting the ratio among the first lamination 1, the second lamination 2, and the third lamination 3 to 2:2:3 makes the number of the communication grooves 1c further increase, reduces the fracture rate, and effectively reduces the magnetic leakage of the rotor core 100. Specifically, taking seven laminations as an example, which includes one first lamination 1, four second laminations 2, and two third laminations 3, so that in every two adjacent receiving grooves, the number M of all the magnetic bridges 1b is 7, and the number 2N of all the magnetic grooves 1a is 14. The ratio (fracture rate) of M to 2N is 7 / 14 = 0.5. On the basis of ensuring a certain structural strength of the rotor core 100, the magnetic leakage of the rotor core 100 is reduced as much as possible.

[0077] Meanwhile, by reasonably arranging the positions of the first lamination 1, the second lamination 2, and the third lamination 3, the rotor core 100 in this embodiment has better connection strength. For example, three continuously connected third laminations 3 are arranged at the central position, and the third laminations 3 are arranged by sequentially stacking the third positive lamination 31 and the third negative lamination 32 to ensure the symmetry of the rotor core 100. On this basis, one first lamination 1 and one second lamination 2 are respectively arranged on both sides to connect the second lamination 2 and the third lamination 3 through the first lamination 1, ensure the structural strength of the overall rotor core 100, and further reduce the number of the magnetic bridges 1b and increase the number of the communication grooves 1c through the second lamination 2, thereby reducing the magnetic leakage.

[0078] In one embodiment, as Figure 2 and Figure 5 shown, multiple laminations are connected in the direction of the rotation axis by means of rivets or snap fasteners.

[0079] It can be understood that on each lamination, a magnetic pole region is formed between two adjacent magnetic slots 1a. A rivet hole 1d or a rivet buckle bend 1e is provided on the magnetic pole region. When connecting by rivets, the lamination is provided with the rivet hole 1d, and a continuous rivet can be passed through the rivet holes 1d on multiple laminations along the direction of the rotation axis to connect the multiple laminations. When connecting by a rivet buckle, the lamination is provided with the rivet buckle bend 1e to form a rivet buckle hole on the lamination. When two adjacent laminations are connected to each other, the rivet buckle bend 1e of one lamination can extend into the rivet buckle hole of the other lamination to realize the connection between the two laminations, so that multiple laminations are stacked and riveted to form the rotor core 100, further ensuring the structural strength. Among them, adjacent first lamination 1 and second lamination 2, or adjacent second lamination 2 and third lamination 3, or adjacent first lamination 1 and third lamination 3, or adjacent two second laminations 2, or adjacent two third laminations 3, etc., are all connected by rivets or rivet buckles to realize the connection between the laminations, thereby improving the connection strength of the multiple laminations and the rotor core 100.

[0080] The present utility model also provides a motor, which includes a stator assembly and the above-mentioned rotor assembly. The stator assembly includes a stator core and a coil wound around the stator core. The rotor assembly is disposed in the center of the stator assembly, and an air gap is formed between the rotor assembly and the stator assembly. The specific structure of the rotor assembly refers to the foregoing embodiments. Since this motor adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0081] The present utility model also provides a compressor, which includes the above-mentioned motor. The specific structure of the motor refers to the foregoing embodiments. Since this compressor adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0082] The above description is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A rotor, characterized in that, It includes a permanent magnet and a rotor core, the rotor core having a rotation axis, and the rotor core comprising: a plurality of laminations, the plurality of laminations being stacked along the rotation axis, each lamination forming a plurality of magnetic slots, the magnetic slots of the plurality of laminations being interconnected along the direction of the rotation axis to form a receiving slot for receiving the permanent magnet; each lamination is formed with a magnetic bridge or a communication slot at one of the magnetic slots, the magnetic bridge being located at the edge of the lamination and blocking the magnetic slot, and the communication slot communicating the magnetic slot with the external space; defining the number of the laminations as N, the number of the magnetic slots in two adjacent receiving slots being 2N, and the number of the magnetic bridges being M, the ratio of M to 2N being between 0.2 and 0.

5.

2. The rotor according to claim 1, wherein The rotor core includes a first lamination and a second lamination, a part of the plurality of laminations being the first lamination, the first lamination including a plurality of the magnetic bridges, each magnetic bridge correspondingly blocking one of the magnetic slots; another part of the plurality of laminations being the second lamination, the second lamination being provided with a plurality of the communication slots, each communication slot communicating one of the magnetic slots with the external space.

3. The rotor according to claim 2, characterized in that, The first lamination and the second lamination are alternately stacked along the direction of the rotation axis; or, three of the second laminations are included between every two of the first laminations.

4. The rotor according to claim 2, wherein The rotor core further includes a third lamination, and still another part of the plurality of laminations being the third lamination; for two adjacent magnetic slots in the third lamination, one of the magnetic slots is communicated with the communication slot, and the other magnetic slot is blocked by the magnetic bridge.

5. The rotor according to claim 4, wherein, The plurality of third laminations are sequentially stacked along the direction of the rotation axis; for the magnetic slots corresponding to the same receiving slot, the magnetic bridges and the communication slots are alternately arranged along the direction of the rotation axis.

6. The rotor according to claim 4, wherein, At both ends of the second lamination along the direction of the rotation axis, at least two connected third laminations are respectively provided.

7. The rotor according to claim 4, characterized in that, The ratio among the first lamination, the second lamination and the third lamination is 1:4:2; The second lamination and the third lamination are connected to each other and symmetrically arranged at both ends of the first lamination along the direction of the rotation axis.

8. The rotor according to claim 4, characterized in that The ratio among the first lamination, the second lamination and the third lamination is 2:2:3; The third laminations are connected to each other, and the first lamination and the second lamination are connected to each other and located at both ends of the third lamination along the direction of the rotation axis.

9. The rotor according to any one of claims 1 to 8, characterized in that, The plurality of laminations are connected along the direction of the rotation axis by means of rivets or snap fasteners.

10. A motor, characterized in that, It includes a rotor as described in any one of claims 1 to 9.

11. A compressor, characterized in that, It includes a motor as described in claim 10.

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