Rotor core, rotor, motor and compressor

Abstract

The invention discloses a rotor iron core, a rotor, a motor and a compressor, and relates to the technical field of motors, and the rotor iron core comprises a plurality of first rotor punching sheets which are stacked along the axial direction of the rotor iron core; the first rotor punching sheet comprises a shaft hole formed in the center of the first rotor punching sheet and a plurality of mounting grooves distributed in the circumferential direction of the shaft hole, a plurality of circulation holes are formed between the mounting grooves and the shaft hole, and at least part of the circulation holes are communicated with at least part of the mounting grooves through first channels; the circulation holes and the first passages are arranged on the center lines of the corresponding mounting grooves, at least part of the circulation holes are communicated with the shaft hole through second passages, and the second passages are arranged on the center lines of the corresponding circulation holes; according to the technical scheme provided by the invention, the loss of the rotor core can be reduced so as to improve the motor efficiency.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and in particular to a rotor core, rotor, electric motor, and compressor. Background Technology

[0002] The motor is the core component of the compressor, and its energy consumption directly affects the compressor's operating efficiency and service life. However, the motor design of traditional compressors has high losses, especially under high-load operating conditions, which makes the losses more significant and reduces motor efficiency. Summary of the Invention

[0003] The main objective of this invention is to provide a rotor core, rotor, motor, and compressor, which aims to reduce rotor core losses in order to improve motor efficiency.

[0004] To achieve the above objectives, the present invention proposes a rotor core comprising a plurality of first rotor laminations stacked along its axial direction;

[0005] The first rotor lamination includes a shaft hole located at the center of the first rotor lamination and a plurality of mounting slots arranged circumferentially along the shaft hole. A plurality of flow holes are provided between the mounting slots and the shaft hole. At least a portion of the flow holes are connected to at least a portion of the mounting slots through a first passage. The flow holes and the first passage are located on the center line of the corresponding mounting slots. At least a portion of the flow holes are connected to the shaft hole through a second passage. The second passage is located on the center line of the corresponding flow holes.

[0006] In one embodiment, the width of the first passage at the mounting groove is d1, and the width of the first passage at the flow hole is d2, where d1 ≤ d2.

[0007] In one embodiment, the width of the second passage at the flow hole is d3, the width of the second passage at the shaft hole is d4, d4≤d3, and d2≤d3.

[0008] In one embodiment, the number of pole pairs of the rotor core is P, and the number of the first passages is K1, where K1 = P; or, K1 = 2P.

[0009] In one embodiment, the number of pole pairs of the rotor core is P, and the number of the second passage is K2, where K2 = P; or, K2 = 2P.

[0010] In one embodiment, the number of first passages on the plurality of first rotor laminations is the same, and the number of second passages on the plurality of first rotor laminations is the same.

[0011] In one embodiment, the plurality of first rotor laminations includes at least first laminations and second laminations stacked along the axial direction of the rotor core;

[0012] The number of second passages on the first lamination is less than the number of second passages on the second lamination.

[0013] In one embodiment, the number of first passages on the first lamination is less than or equal to the number of first passages on the second lamination.

[0014] In one embodiment, a plurality of first laminations are provided, and at least one first lamination is provided at each end of the rotor core, and the second lamination is located between the two first laminations respectively provided at both ends of the rotor core.

[0015] In one embodiment, the number of the first laminations is 2N1, the number of the second laminations is N2, and 0.5≤N2 / N1≤8.

[0016] In one embodiment, multiple second laminations are provided and arranged between two first laminations located at both ends of the rotor core.

[0017] In one embodiment, the rotor core further includes a lamination assembly and a first lamination disposed at the end of the lamination assembly;

[0018] The lamination assembly includes stacked first laminations and second laminations, and the number of first laminations located at the end of the lamination assembly is equal to the number of first laminations located within the lamination assembly.

[0019] In one embodiment, each of the first and second laminations is provided in the lamination assembly;

[0020] Alternatively, within the lamination assembly, both the first lamination and the second lamination may be provided in multiple quantities.

[0021] In one embodiment, the lamination assembly is provided in multiple sets.

[0022] In one embodiment, the rotor core further includes at least one second rotor lamination stacked with the first rotor lamination, the second rotor lamination not having the first passage and the second passage.

[0023] In one embodiment, the mounting groove includes a first groove segment that is radially parallel to the rotor core and two second groove segments connected to opposite sides of the first groove segment, and the flow hole communicates with the first groove segment.

[0024] In one embodiment, a first permanent magnet is installed in the first slot section, and the length of the first permanent magnet is Lm1. A second permanent magnet is installed in the second slot section, and the length of the second permanent magnet is Lm2, where 1.02≤Lm1 / Lm2≤1.3.

[0025] In one embodiment, the first rotor lamination is provided with an air groove located between two adjacent mounting grooves, the area of ​​the air groove being S, where 3≤S≤3.9.

[0026] The present invention also proposes a rotor comprising a rotor core as described above.

[0027] The present invention also proposes an electric motor comprising a rotor as described above.

[0028] The present invention also proposes a compressor comprising the motor described above.

[0029] In the technical solution of the present invention, at least a portion of the mounting groove and at least a portion of the flow hole are connected through a first passage, and at least a portion of the flow hole and the shaft hole are connected through a second passage, thereby adjusting the magnetic field saturation phenomenon between the mounting groove and the flow hole, and between the flow hole and the shaft hole, reducing leakage magnetic flux at the corresponding positions, reducing magnetic resistance and magnetic flux loss, and at the same time, effectively ensuring the structural strength of the rotor core, thereby improving motor efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the structure of a first rotor lamination of the rotor core provided by the present invention;

[0032] Figure 2 This is a schematic diagram of another embodiment of the first rotor lamination provided by the present invention;

[0033] Figure 3 This is a schematic diagram of another embodiment of the first rotor lamination provided by the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of another embodiment of the first rotor lamination provided by the present invention;

[0035] Figure 5 This is a schematic diagram of the structure of an embodiment of the second rotor lamination provided by the present invention;

[0036] Figure 6 A schematic diagram of a structure of an embodiment of the first and second laminations stacked together according to the present invention;

[0037] Figure 7A schematic diagram of another embodiment of the stacked first and second laminations provided by the present invention;

[0038] Figure 8 A schematic diagram of a structure of an embodiment of the stacked first rotor lamination and second rotor lamination provided by the present invention;

[0039] Figure 9 A schematic diagram of another embodiment of the stacked first rotor lamination and second rotor lamination provided by the present invention.

[0040] Explanation of icon numbers:

[0041] 100. Rotor core; 101. Shaft hole; 11. First rotor lamination; 111. First passage; 112. Second passage; 113. First lamination; 114. Second lamination; 12. Flow hole; 13. Mounting slot; 131. First slot segment; 132. Second slot segment; 14. Air slot; 15. Lamination assembly; 16. Second rotor lamination.

[0042] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0044] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0045] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0046] The motor is the core component of the compressor, and its energy consumption directly affects the compressor's operating efficiency and service life. However, the motor design of traditional compressors has high losses, especially under high-load operating conditions, which makes the losses more significant and reduces motor efficiency.

[0047] To solve this technical problem, the present invention proposes a rotor core 100.

[0048] Please see Figures 1 to 9 In one embodiment of the present invention, the rotor core 100 includes a plurality of first rotor laminations 11 stacked along its axial direction; each first rotor lamination 11 includes a shaft hole 101 located at the center of the first rotor lamination 11 and a plurality of mounting grooves 13 arranged circumferentially along the shaft hole 101. A plurality of flow holes 12 are provided between the mounting grooves 13 and the shaft hole 101. At least a portion of the flow holes 12 are connected to at least a portion of the mounting grooves 13 through a first passage 111. The flow holes 12 and the first passage 111 are located on the center line of the corresponding mounting grooves 13. At least a portion of the flow holes 12 are connected to the shaft hole 101 through a second passage 112. The second passage 112 is located on the center line of the corresponding flow holes 12. This helps to reduce the loss of the rotor core 100 and improve the motor efficiency.

[0049] In the technical solution of the present invention, at least a portion of the mounting groove 13 and at least a portion of the flow hole 12 are connected through a first passage 111, and at least a portion of the flow hole 12 and the shaft hole 101 are connected through a second passage 112. This is to adjust the magnetic field saturation phenomenon between the mounting groove 13 and the flow hole 12, and between the flow hole 12 and the shaft hole 101, reduce the leakage magnetic field at the corresponding position, reduce magnetic resistance and magnetic flux loss, and at the same time, effectively ensure the structural strength of the rotor core 100, thereby improving the motor efficiency.

[0050] Specifically, the flow hole 12, the mounting groove 13, and the first passage 111 connecting the flow hole 12 and the mounting groove 13 are located on the same center line, which is the center line of the mounting groove 13 connected to the first passage 111. Similarly, the flow hole 12, the shaft hole 101, and the second passage 112 connecting the flow hole 12 and the shaft hole 101 are located on the same center line, which is the center line of the flow hole 12 connected to the second passage 112. This center line can coincide with the center line of the corresponding mounting groove 13, thereby ensuring a uniform distribution of the magnetic field on the rotor core 100. The mounting slot 13 is used to fix the permanent magnet, and the flow hole 12 is used to reduce the weight of the rotor core 100 and improve the heat dissipation of the rotor core 100. It can also optimize the magnetic circuit of the rotor core 100 to a certain extent. The setting of the first passage 111 and the second passage 112 can further reduce the weight of the rotor core 100. The number of them is specifically related to the number of poles of the rotor core 100 and also to the loss of the rotor core 100. That is, while ensuring the structural strength of the rotor core 100, it can be set according to the specific number of poles and the required reduction of loss.

[0051] Please see Figure 1 In an embodiment of the present invention, the width of the first passage 111 at the mounting groove 13 is d1, and the width of the first passage 111 at the flow hole 12 is d2, where d1≤d2. This configuration ensures reliable assembly of the permanent magnet within the mounting groove 13 while maintaining the connectivity between the first passage 111 and the mounting groove 13 and the flow hole 12. At the same time, it avoids increased magnetic leakage due to excessive width of the first passage 111 at the mounting groove 13, thus helping to reduce losses, ensure normal output torque of the motor, and improve motor efficiency.

[0052] Please see Figure 1 In an embodiment of the present invention, the width of the second passage 112 at the flow hole 12 is d3, and the width of the second passage 112 at the shaft hole 101 is d4, where d4≤d3 and d2≤d3. This arrangement ensures the connectivity between the second passage 112 and the shaft hole 101 and the flow hole 12, while also ensuring reliable assembly of the rotating shaft within the shaft hole 101. At the same time, it avoids the rotor core 100 from shaking due to excessive width of the second passage 112 at the shaft hole 101, thus ensuring normal operation of the motor and improving motor efficiency.

[0053] Specifically, in one embodiment of the present invention, the number of pole pairs of the rotor core 100 is P, and the number of the first passages 111 is K1, where K1 = P; as Figure 3 and Figure 4As shown, the rotor has 6 poles and 3 pole pairs. Therefore, there are 6 mounting slots 13 and 3 first passages 111. The three first passages 111 are evenly spaced along the circumference of the rotor core 100, improving the structural stability of the first rotor laminations 11. Simultaneously, this reduces magnetic leakage inside the mounting slots 13 connected to the first passages 111, decreasing rotor core 100 losses and thus enhancing efficiency. The number of flow holes 12 can be greater than or equal to 3.

[0054] In another embodiment of the present invention, the rotor core 100 has P pole pairs, and the number of the first passages 111 is K1, where K1 = 2P; Figure 1 and Figure 2 As shown, the rotor has 6 poles and 3 pole pairs. There are 6 mounting slots 13 and 6 first passages 111. These 6 first passages 111 are evenly spaced along the circumference of the rotor core 100 and correspond one-to-one with each mounting slot 13. This improves the structural stability of the first rotor laminations 11 and reduces magnetic leakage inside the mounting slots 13 connected to the first passages 111, reducing rotor core 100 losses and thus enhancing efficiency. There are 6 flow holes 12 to improve heat dissipation and reduce the overall weight of the rotor core 100. The number of pole pairs in the rotor core 100 includes, but is not limited to, 3, 4, 5, and 6.

[0055] Specifically, in one embodiment of the present invention, the number of pole pairs of the rotor core 100 is P, and the number of the second passages 112 is K2, where K2 = P; as Figure 1 and Figure 4 As shown, the rotor has 6 poles and 3 pole pairs. Therefore, the number of second passages 112 is 3. These three second passages 112 are evenly spaced along the circumference of the rotor core 100, improving the structural stability of the first rotor lamination 11 and helping to reduce the loss of the rotor core 100, thereby further enhancing efficiency. The number of flow holes 12 can be greater than or equal to 3.

[0056] In another embodiment of the present invention, the rotor core 100 has P pole pairs, and the number of the second passages 112 is K2, where K2 = 2P; Figure 2 and Figure 3 As shown, the rotor has 6 poles and 3 pole pairs. At this time, the number of second passages 112 is 6. The 6 second passages 112 are evenly spaced along the circumference of the rotor core 100 and are connected to each flow hole 12 and shaft hole 101 respectively. Each flow hole 12 corresponds to each mounting slot 13, which improves the structural stability of the second rotor lamination 16, reduces the loss of the rotor core 100, and enhances the efficiency improvement effect. It also facilitates the heat dissipation effect of the rotor core 100 and reduces the overall weight of the rotor core 100.

[0057] Optionally, in an embodiment of the present invention, the number of first passages 111 on the plurality of first rotor laminations 11 is the same, and the number of second passages 112 on the plurality of first rotor laminations 11 is the same, which facilitates the faster forming of the rotor core 100.

[0058] Among them, such as Figure 1 As shown, when the number of second passages 112 is less than the number of mounting slots 13 of the first rotor lamination 11, and the number of first passages 111 is equal to the number of mounting slots 13 of the first rotor lamination 11, the specific efficiency improvement comparison analysis is shown in the following table:

[0059]

[0060] It can be seen that "original motor" specifically refers to a motor that does not use rotor laminations with first passage 111 and second passage 112, while "improved motor" refers to a motor that uses first rotor laminations 11 with first passage 111 and second passage 112. For a specific speed, compared with the original motor, the improved motor has a significantly improved motor efficiency during operation. That is, by improving the structure of the first rotor laminations 11, the first rotor laminations 11 can achieve high stability and low loss characteristics at high speed, thereby significantly improving motor efficiency.

[0061] In this embodiment, the second passages 112 on two adjacent first rotor laminations 11 can be at least partially staggered to enhance the overall structural strength of the rotor core 100 and improve motor efficiency. However, in other embodiments, it is sufficient to align the mounting slots 13 on two adjacent first rotor laminations 11 to ensure the installation of the permanent magnets.

[0062] Please see Figure 3 and Figure 4 In an embodiment of the present invention, the plurality of first rotor laminations 11 include at least first laminations 113 and second laminations 114 stacked along the axial direction of the rotor core 100;

[0063] The number of second passages 112 on the first lamination 113 is less than the number of second passages 112 on the second lamination 114. Specifically, the number of first passages 111 on the first lamination 113 is equal to the number of first passages 111 on the second lamination 114, or the number of first passages 111 on the first lamination 113 is less than the number of first passages 111 on the second lamination 114. This ensures that the formed rotor core 100 has a high overall holding force, i.e., better structural strength, and also reduces rotor core 100 losses and leakage flux to a certain extent, thereby improving motor efficiency. However, in other embodiments, the rotor laminations can be stacked with laminations that do not have first passages 111 and / or second passages 112 to form the rotor core 100.

[0064] Specifically, in an embodiment of the present invention, multiple first laminations 113 are provided, and at least one first lamination 113 is provided at each end of the rotor core 100. A second lamination 114 is located between two first laminations 113 located at each end of the rotor core 100. Taking an example where the number of first passages 111 on the first lamination 113 is equal to the number of first passages 111 on the second lamination 114, since the number of second passages 112 on the first lamination 113 is less than the number of second passages 112 on the second lamination 114, the structural strength of the first lamination 113 is higher than that of the second lamination 114. Therefore, placing the second lamination 114 between the first laminations 113 at both ends ensures the structural strength at both ends of the rotor core 100. Of course, in other embodiments, at least one second lamination 114 is provided at each end of the rotor core 100, and the first lamination 113 is located between two second laminations 114 located at each end of the rotor core 100.

[0065] Specifically, in the embodiments of the present invention, the number of the first laminations 113 is 2N1, and the number of the second laminations 114 is N2, where 0.5≤N2 / N1≤8. It can be understood that in order to ensure the structural stability of the rotor core 100, both ends of the rotor core 100 are provided with an equal number of first laminations 113, so that the specific number of the first laminations 113 is 2N1. The second laminations 114 are provided so that the number of their second passages 112 is greater than the number of their second passages 112 on the first laminations 113, and the number of their first passages 111 is greater than or equal to the number of their first passages 111 on the first laminations 113. This further reduces the loss and leakage flux of the rotor core 100, while also reducing the weight of the rotor core 100, effectively improving the efficiency and performance of the motor.

[0066] Specifically, when the N2 / N1 ratio is too small, the efficiency improvement effect may not be significantly improved due to the insufficient number of second laminations 114. When the N2 / N1 ratio is too large, the total number of first laminations 113 is less than the number of second laminations 114, which may affect the overall structural strength of the rotor core 100 due to the excessive number of second laminations 114. Therefore, the ratio is limited to 0.5 ≤ N2 / N1 ≤ 8 to further improve the efficiency of the motor using the rotor core 100 while ensuring the structural strength of the rotor core 100. The specific values ​​of N2 / N1 include, but are not limited to, 0.5, 0.8, 1, 2, 3, 4, 5, 6, 7, and 8.

[0067] Please see Figure 6 In an embodiment of the present invention, multiple second laminations 114 are provided and arranged between the two first laminations 113 at both ends of the rotor core 100; that is, multiple second laminations 114 are stacked in the axial direction of the first rotor laminations 11 and are all located between the first laminations 113 at both ends of the rotor core 100 to form the rotor core 100; wherein, according to 0.5≤N2 / N1≤8, the number of first laminations 113 and second laminations 114 on the rotor core 100 is reasonably designed to obtain a rotor core 100 with high stability and low loss characteristics under high-speed operation.

[0068] Please see Figure 7 In an embodiment of the present invention, the rotor core 100 further includes a lamination assembly 15 and a first lamination 113 disposed at the end of the lamination assembly 15. The lamination assembly 15 includes stacked first laminations 113 and second laminations 114, and the number of first laminations 113 at the end of the lamination assembly 15 is equal to the number of first laminations 113 within the lamination assembly 15, thereby ensuring the symmetrical arrangement of the two first laminations 113 at both ends of the rotor core 100, which facilitates the improvement of the rotor's structural stability. The specific number of lamination assemblies 15 mainly depends on the axial thickness of the rotor core 100 and the performance requirements of the motor. One set or multiple sets of lamination assemblies 15 can be provided. However, in other embodiments, the positions of the first laminations 113 and the second laminations 114 can be interchanged.

[0069] Specifically, in one embodiment of the present invention, each of the first lamination 113 and the second lamination 114 is provided in the lamination assembly 15; forming a lamination assembly 15 with high stability and low loss characteristics, which facilitates the assembly of the rotor core 100; when multiple lamination assemblies 15 are provided, each lamination assembly 15 is stacked sequentially along the axial direction of the rotor core 100, and a first lamination 113 is provided at the end of the stacked lamination assembly, to ensure the symmetry of the rotor core 100 structure. Also, because the number of first passages 111 on the first lamination 113 is less than or equal to the number of first passages 111 on the second lamination 114, and the number of second passages 112 on the first lamination 113 is less than the number of second passages 112 on the second lamination 114, the structural strength at both ends of the rotor core 100 is ensured.

[0070] Specifically, in another embodiment of the present invention, multiple first laminations 113 and second laminations 114 are provided in the lamination assembly 15 to form a lamination assembly 15 with high stability and low loss characteristics, which facilitates the assembly of the rotor core 100. When multiple lamination assemblies 15 are provided, each lamination assembly 15 is stacked sequentially along the axial direction of the rotor core 100, and multiple first laminations 113 are provided at the end of the stacked lamination assembly to ensure the symmetry of the rotor core 100 structure. Also, because the number of first passages 111 on the first laminations 113 is less than or equal to the number of first passages 111 on the second laminations 114, and the number of second passages 112 on the first laminations 113 is less than the number of second passages 112 on the second laminations 114, the structural strength at both ends of the rotor core 100 is ensured. In this case, the specific number of lamination assemblies 15 is (total number of laminations - number of first laminations 113 at the end) / 2.

[0071] Please see Figure 5 , Figures 8 to 9 In an embodiment of the present invention, the rotor core 100 further includes at least one second rotor lamination 16 stacked with the first rotor lamination 11. The second rotor lamination 16 does not have the first passage 111 and the second passage 112. In this way, the overall structural strength of the rotor core 100 can be ensured. At the same time, by utilizing the structural improvement of the first rotor lamination 11, the high stability and low loss characteristics of the rotor core 100 under high-speed operation are improved, thereby significantly improving the motor efficiency.

[0072] The stacking of the first rotor lamination 11 and the second rotor lamination 16 can be referenced to the stacking method of the first lamination 113 and the second lamination 114. That is, the first lamination 113 or the second lamination 114 can be replaced to further improve the structural strength of the rotor core 100.

[0073] Please see Figure 1In an embodiment of the present invention, the mounting groove 13 includes a first groove segment 131 that is radially parallel to the rotor core 100 and two second groove segments 132 connected to opposite sides of the first groove segment 131. The flow hole 12 communicates with the first groove segment 131. That is, the first groove segment 131 extends in a direction parallel to the radial direction of the rotor core 100, and the second groove segments 132 are set at an angle to the first groove segment 131, and their extension direction can intersect with the radial direction of the rotor core 100. The first passage 111 connects the flow hole 12 and the first groove segment 131, which facilitates the achievement of structural symmetry, ensures the uniform distribution of the magnetic field on the rotor lamination, thereby improving the running stability of the motor, reliably reducing noise, and also facilitating the optimization of the magnetic circuit on the first rotor lamination 11, improving motor efficiency and motor performance. The mounting groove 13, including the first groove segment 131 and two second groove segments 132, can increase the magnetic flux and magnetic field strength to a certain extent, and also helps to improve the structural strength of the first rotor lamination 11 and extend the service life of the rotor core 100. However, in other embodiments, the mounting groove 13 includes only the first groove segment 131; or, the first groove segment 131 and the two second groove segments 132 are all connected to the first passage 111, in which case the shape of the flow hole 12 is adapted to the formation of the mounting groove 13.

[0074] Optionally, in an embodiment of the present invention, a first permanent magnet is installed in the first slot 131, and the length of the first permanent magnet is Lm1. A second permanent magnet is installed in the second slot 132, and the length of the second permanent magnet is Lm2, where 1.02≤Lm1 / Lm2≤1.3. The length direction of the first permanent magnet is parallel to the radial direction of the rotor core 100, which helps to generate a constant magnetic flux and ensure the stability of the magnetic field during high-speed operation. The length direction of the second permanent magnet is at an angle to the radial direction of the rotor core 100, which helps to improve starting performance. By limiting 1.02≤Lm1 / Lm2≤1.3, the length of the first permanent magnet is always greater than the length of the second permanent magnet, which improves the running stability of the motor. With the two symmetrically arranged second permanent magnets, the starting reliability of the motor can also be enhanced. At the same time, it is also easier for the motor to adapt to different working conditions and load requirements. This arrangement helps to improve the efficiency and performance of the motor.

[0075] Optionally, in an embodiment of the present invention, the first rotor lamination 11 is provided with an air groove 14 located between two adjacent mounting grooves 13. The area of ​​the air groove 14 is S, where 3 ≤ S ≤ 3.9. Specifically, when the area of ​​the air groove 14 is less than 3, it is not conducive to reducing leakage flux. When the area of ​​the air groove 14 is greater than 3.9, it is easy to reduce the structural strength of the rotor lamination. Therefore, limiting the area of ​​the air groove 14 to between 3 and 3.9 can reduce leakage flux and reduce the impact on output torque. At the same time, it can effectively protect the structural strength of the rotor core 100, thereby improving motor efficiency and motor performance.

[0076] Specifically, the area S of the air trough 14 can take values ​​including but not limited to 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, and 3.9. Furthermore, the cross-sectional shape of the air trough 14 can be circular or trapezoidal.

[0077] The present invention also proposes a rotor, which includes a rotor core 100. The specific structure of the rotor core 100 is as described in the above embodiments. Since this rotor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0078] The present invention also proposes an electric motor, which includes a rotor. The specific structure of the rotor is as described in the above embodiments. Since this electric motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. Each first rotor lamination 11 is stacked through riveting holes to form a rotor core 100. Permanent magnets are installed in mounting grooves 13, and the stator is fixed to the outer periphery of the rotor core 100.

[0079] This invention also proposes a compressor, which includes a motor. The specific structure of the motor is as described in the above embodiments. Since this compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here. The compressor can be applied to equipment such as air conditioners and refrigerators.

[0080] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A rotor core, characterized in that, It includes multiple first rotor laminations stacked along its axial direction; The first rotor lamination includes a shaft hole located at the center of the first rotor lamination and a plurality of mounting slots arranged circumferentially along the shaft hole. A plurality of flow holes are provided between the mounting slots and the shaft hole. At least a portion of the flow holes are connected to at least a portion of the mounting slots through a first passage. The flow holes and the first passage are located on the center line of the corresponding mounting slots. At least a portion of the flow holes are connected to the shaft hole through a second passage. The second passage is located on the center line of the corresponding flow holes.

2. The rotor core as described in claim 1, characterized in that, The width of the first passage at the mounting groove is d1, and the width of the first passage at the flow hole is d2, where d1 ≤ d2.

3. The rotor core as described in claim 2, characterized in that, The width of the second passage at the flow hole is d3, and the width of the second passage at the shaft hole is d4, where d4≤d3 and d2≤d3.

4. The rotor core as described in claim 1, characterized in that, The rotor core has P pole pairs and the number of the first passages is K1, where K1 = P; Alternatively, K1 = 2P.

5. The rotor core as described in claim 1, characterized in that, The rotor core has P pole pairs and the number of the second passage is K2, where K2 = P; Alternatively, K2 = 2P.

6. The rotor core as described in claim 1, characterized in that, The number of first passages on the plurality of first rotor laminations is the same, and the number of second passages on the plurality of first rotor laminations is the same.

7. The rotor core as described in claim 1, characterized in that, The plurality of first rotor laminations include at least first laminations and second laminations stacked along the axial direction of the rotor core; The number of second passages on the first lamination is less than the number of second passages on the second lamination.

8. The rotor core as described in claim 7, characterized in that, The number of first passages on the first lamination is less than or equal to the number of first passages on the second lamination.

9. The rotor core as described in claim 7, characterized in that, The first lamination is provided in multiple ways, and at least one first lamination is provided at each end of the rotor core. The second lamination is located between the two first laminations respectively provided at both ends of the rotor core.

10. The rotor core as described in claim 9, characterized in that, The number of the first lamination is 2N1, the number of the second lamination is N2, and 0.5≤N2 / N1≤8.

11. The rotor core as described in claim 9, characterized in that, The second lamination is provided in multiples and is arranged between the two first laminations located at both ends of the rotor core.

12. The rotor core as described in claim 9, characterized in that, The rotor core also includes a lamination assembly and a first lamination disposed at the end of the lamination assembly; The lamination assembly includes stacked first laminations and second laminations, and the number of first laminations located at the end of the lamination assembly is equal to the number of first laminations located within the lamination assembly.

13. The rotor core as described in claim 12, characterized in that, Within the lamination assembly, one first lamination and one second lamination are each provided; Alternatively, within the lamination assembly, both the first lamination and the second lamination may be provided in multiple quantities.

14. The rotor core as described in claim 13, characterized in that, The lamination assembly is provided in multiple sets.

15. The rotor core as described in claim 1, characterized in that, The rotor core also includes at least one second rotor lamination stacked with the first rotor lamination, the second rotor lamination not having the first passage and the second passage.

16. The rotor core as described in claim 1, characterized in that, The mounting slot includes a first slot section that is radially parallel to the rotor core and two second slot sections connected to opposite sides of the first slot section. The flow hole communicates with the first slot section.

17. The rotor core as described in claim 16, characterized in that, A first permanent magnet is installed in the first slot, and the length of the first permanent magnet is Lm1. A second permanent magnet is installed in the second slot, and the length of the second permanent magnet is Lm2. 1.02≤Lm1 / Lm2≤1.

3.

18. The rotor core as described in claim 1, characterized in that, The first rotor lamination has an air groove located between two adjacent mounting grooves, and the area of ​​the air groove is S, where 3 ≤ S ≤ 3.

9.

19. A rotor, characterized in that, Includes the rotor core as described in any one of claims 1 to 18.

20. An electric motor, characterized in that, Includes the rotor as described in claim 19.

21. A compressor, characterized in that, Including the motor as described in claim 20.

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