Rotor core, rotor, motor and compressor

Abstract

The utility model 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 laminated 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 utility model, the loss of the rotor iron core can be reduced so as to improve the motor efficiency.

Description

Technical Field

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

[0002] The motor is the core part of the compressor, and its energy consumption directly affects the operation efficiency and service life of the compressor; however, the motor design of traditional compressors has relatively high losses, especially under high-load working conditions, the losses are more significant, thus reducing the motor efficiency. Summary of the Utility Model

[0003] The main object of the utility model is to provide a rotor core, a rotor, a motor and a compressor, aiming to reduce the loss of the rotor core so as to improve the motor efficiency.

[0004] To achieve the above object, the rotor core proposed by the utility model comprises a plurality of first rotor punching sheets stacked along its axial direction;

[0005] The first rotor punching sheet comprises a shaft hole arranged at the center of the first rotor punching sheet, and a plurality of mounting grooves arranged circumferentially along the shaft hole. A plurality of flow holes are arranged between the mounting grooves and the shaft hole. At least part of the flow holes are communicated with at least part of the mounting grooves through a first passage. The flow holes and the first passage are arranged on the center line of the corresponding mounting groove. At least part of the flow holes are communicated with the shaft hole through a second passage. The second passage is arranged on the center line of the corresponding flow hole.

[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, and d1≤d2.

[0007] In one embodiment, 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, and 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, and 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 passages is K2, and K2 = P; or K2 = 2P.

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

[0011] In one embodiment, the plurality of first rotor punching sheets at least include a first punching sheet and a second punching sheet stacked along the axial direction of the rotor core;

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

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

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

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

[0016] In one embodiment, a plurality of the second punching sheets are provided and are arranged between the two first punching sheets provided at the two ends of the rotor core.

[0017] In one embodiment, the rotor core further includes a punching sheet combination and the first punching sheet provided at the end of the punching sheet combination;

[0018] The punching sheet combination includes the stacked first punching sheet and the second punching sheet, and the number of the first punching sheets at the end of the punching sheet combination is equal to the number of the first punching sheets within the punching sheet combination.

[0019] In one embodiment, within the punching sheet combination, one first punching sheet and one second punching sheet are provided respectively;

[0020] Alternatively, within the punching sheet combination, a plurality of first punching sheets and a plurality of second punching sheets are provided respectively.

[0021] In one embodiment, a plurality of groups of the punching sheet combinations are provided.

[0022] In one embodiment, the rotor core further includes at least one second rotor punching sheet stacked with the first rotor punching sheet, and the second rotor punching sheet does not have the first passage and the second passage.

[0023] In one embodiment, the installation groove includes a first groove section parallel to the radial direction of the rotor core and two second groove sections connected to opposite sides of the first groove section, and the circulation hole is communicated with the first groove section.

[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, an air slot is provided on the first rotor punching sheet between two adjacent installation slots, and the area of the air slot is S, where 3 ≤ S ≤ 3.9.

[0026] The present utility model also provides a rotor, which includes the rotor core as described above.

[0027] The present utility model also provides a motor, which includes the rotor as described above.

[0028] The present utility model also provides a compressor, which includes the motor as described above.

[0029] In the technical solution of the present utility model, at least part of the installation slots and at least part of the circulation holes are connected through a first passage, and at least part of the circulation holes and the shaft hole are connected through a second passage, so as to adjust the magnetic field saturation phenomenon between the installation slots and the circulation holes, and between the circulation holes and the shaft hole, reduce the magnetic leakage at the corresponding positions, reduce the magnetic resistance and magnetic flux loss, and at the same time, effectively ensure the structural strength of the rotor core, thereby improving the motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 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, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0031] Figure 1 FIG. 1 is a schematic structural diagram of a first rotor punching sheet of a rotor core provided by the present utility model;

[0032] Figure 2 FIG. 2 is a schematic structural diagram of another embodiment of the first rotor punching sheet provided by the present utility model;

[0033] Figure 3 FIG. 3 is a schematic structural diagram of still another embodiment of the first rotor punching sheet provided by the present utility model;

[0034] Figure 4 FIG. 4 is a schematic structural diagram of yet another embodiment of the first rotor punching sheet provided by the present utility model;

[0035] Figure 5 FIG. 5 is a schematic structural diagram of a first embodiment of a second rotor punching sheet provided by the present utility model;

[0036] Figure 6 Schematic structural diagram of an embodiment of the first punching sheet and the second punching sheet arranged in a stacked manner provided by the present utility model;

[0037] Figure 7 Schematic structural diagram of another embodiment of the first punching sheet and the second punching sheet arranged in a stacked manner provided by the present utility model;

[0038] Figure 8 Schematic structural diagram of an embodiment of the first rotor punching sheet and the second rotor punching sheet arranged in a stacked manner provided by the present utility model;

[0039] Figure 9 Schematic structural diagram of another embodiment of the first rotor punching sheet and the second rotor punching sheet arranged in a stacked manner provided by the present utility model.

[0040] Explanation of the reference numerals in the drawings:

[0041] 100, rotor core; 101, shaft hole; 11, first rotor punching sheet; 111, first passage; 112, second passage; 113, first punching sheet; 114, second punching sheet; 12, flow hole; 13, installation groove; 131, first groove section; 132, second groove section; 14, air groove; 15, punching sheet combination; 16, second rotor punching sheet.

[0042] 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

[0043] 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.

[0044] 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 positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0045] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "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 various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or is unable to 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.

[0046] The motor is the core part of the compressor, and its energy consumption directly affects the operating efficiency and service life of the compressor; however, the motor design of traditional compressors has relatively high losses, especially under high-load working conditions, and the losses are more significant, thus reducing the motor efficiency.

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

[0048] Please refer to Figures 1 to 9 , in an embodiment of the present utility model, the rotor core 100 includes a plurality of first rotor punching sheets 11 laminated along its axial direction; the first rotor punching sheet 11 includes a shaft hole 101 provided at the center of the first rotor punching sheet 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 part of the flow holes 12 communicate with at least part of the mounting grooves 13 through a first passage 111. The flow holes 12 and the first passage 111 are provided on the center line of the corresponding mounting groove 13. At least part of the flow holes 12 communicate with the shaft hole 101 through a second passage 112. The second passage 112 is provided on the center line of the corresponding flow hole 12; thus, it helps to reduce the loss of the rotor core 100 to improve the motor efficiency.

[0049] In the technical solution of the present utility model, at least part of the mounting grooves 13 communicate with at least part of the flow holes 12 through the first passage 111, and at least part of the flow holes 12 communicate with the shaft hole 101 through the second passage 112, so as to adjust the magnetic field saturation phenomenon between the mounting grooves 13 and the flow holes 12, and between the flow holes 12 and the shaft hole 101, reduce the magnetic leakage at the corresponding positions, reduce the 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 circulation hole 12, the installation groove 13, and the first passage 111 connecting the circulation hole 12 and the installation groove 13 are located on the same center line, which is the center line of the installation groove 13 connected by the first passage 111. The circulation hole 12, the shaft hole 101, and the second passage 112 connecting the circulation hole 12 and the shaft hole 101 are located on the same center line, which is the center line of the circulation hole 12 connected by the second passage 112, and this center line can coincide with the center line of the corresponding installation groove 13 to ensure the uniform distribution of the magnetic field on the rotor core 100. Among them, the installation groove 13 is used to fix the permanent magnet, the circulation hole 12 is used to reduce the weight of the rotor core 100 and improve the heat dissipation effect of the rotor core 100, and can also optimize the magnetic circuit of the rotor core 100 to a certain extent. The settings of the first passage 111 and the second passage 112 can further reduce the weight of the rotor core 100, and their quantity is specifically associated with the number of poles of the rotor core 100 and is also related to the loss of the rotor core 100, that is, it can be set according to the specific number of poles and the required loss reduction on the basis of ensuring the structural strength of the rotor core 100.

[0051] Please refer to Figure 1 , in the embodiment of the present invention, the width of the first passage 111 at the installation groove 13 is d1, and the width of the first passage 111 at the circulation hole 12 is d2, d1 ≤ d2. With such a setting, on the basis of ensuring the connection effect of the first passage 111 on the installation groove 13 and the circulation hole 12, the reliable assembly of the permanent magnet in the installation groove 13 is ensured. At the same time, the magnetic leakage is avoided from increasing due to the excessive width of the first passage 111 at the installation groove 13, which helps to reduce the loss, ensure the normal output torque of the motor, and improve the motor efficiency.

[0052] Please refer to Figure 1 , in the embodiment of the present invention, the width of the second passage 112 at the circulation hole 12 is d3, and the width of the second passage 112 at the shaft hole 101 is d4, d4 ≤ d3, and d2 ≤ d3. With such a setting, on the basis of ensuring the connection effect of the second passage 112 on the shaft hole 101 and the circulation hole 12, the reliable assembly of the rotating shaft in the shaft hole 101 is ensured. At the same time, the shaking of the rotor core 100 is avoided due to the excessive width of the second passage 112 at the shaft hole 101, ensuring the normal operation of the motor and improving the motor efficiency.

[0053] Specifically, in an 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, K1 = P; as Figure 3 and Figure 4As shown, the number of poles of the rotor is 6 and the number of pole pairs is 3. At this time, 6 installation grooves 13 are provided, and the number of the first passages 111 is 3. Among them, the three first passages 111 are evenly spaced along the circumferential direction of the rotor core 100, improving the structural stability of the first rotor punching sheet 11. At the same time, the magnetic leakage inside the installation groove 13 connected to the first passage 111 is improved, the loss of the rotor core 100 is reduced, and thus the efficiency improvement effect is enhanced. The number of the circulation holes 12 can be greater than or equal to 3.

[0054] In another 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, and K1 = 2P; as Figure 1 and Figure 2 As shown, the number of poles of the rotor is 6 and the number of pole pairs is 3. At this time, 6 installation grooves 13 are provided, and the number of the first passages 111 is 6. Among them, the 6 first passages 111 are evenly spaced along the circumferential direction of the rotor core 100 and are in one-to-one correspondence with the respective installation grooves 13, improving the structural stability of the first rotor punching sheet 11. At the same time, the magnetic leakage inside the installation groove 13 connected to the first passage 111 is improved, the loss of the rotor core 100 is reduced, and thus the efficiency improvement effect is enhanced. The number of the circulation holes 12 is 6, which is convenient for enhancing the heat dissipation effect of the rotor core 100 and reducing the overall weight of the rotor core 100. The number of pole pairs of 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, and K2 = P; as Figure 1 and Figure 4 As shown, the number of poles of the rotor is 6 and the number of pole pairs is 3. At this time, the number of the second passages 112 is 3. Among them, the three second passages 112 are evenly spaced along the circumferential direction of the rotor core 100, improving the structural stability of the first rotor punching sheet 11. At the same time, it helps to reduce the loss of the rotor core 100, and thus further enhances the efficiency improvement effect. The number of the circulation holes 12 can be greater than or equal to 3.

[0056] In another 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, and K2 = 2P; as Figure 2 and Figure 3 As shown, the number of poles of the rotor is 6 and the number of pole pairs is 3. At this time, the number of the second passages 112 is 6. Among them, the 6 second passages 112 are evenly spaced along the circumferential direction of the rotor core 100 and are respectively communicated with the respective circulation holes 12 and the shaft hole 101. Each circulation hole 12 is in one-to-one correspondence with each installation groove 13, improving the structural stability of the second rotor punching sheet 16. At the same time, the loss of the rotor core 100 is reduced, and thus the efficiency improvement effect is enhanced. It is also convenient for enhancing the heat dissipation effect of the rotor core 100 and reducing the overall weight of the rotor core 100.

[0057] Optionally, in the embodiments of the present utility model, the number of the first passages 111 on the plurality of first rotor laminations 11 is the same, and the number of the second passages 112 on the plurality of first rotor laminations 11 is the same, which is convenient for accelerating the forming of the rotor core 100.

[0058] Among them, as Figure 1 shown, when the number of the second passages 112 is less than the number of the mounting grooves 13 of the first rotor lamination 11, and the number of the first passages 111 is equal to the number of the mounting grooves 13 of the first rotor lamination 11, taking this as an example, the specific efficiency improvement comparison and analysis are as follows in the following table:

[0059]

[0060] It can be seen that the "original motor" specifically refers to a motor that does not adopt a rotor lamination with the first passage 111 and the second passage 112, and the "improved motor" refers to a motor that adopts the first rotor lamination 11 with the first passage 111 and the second passage 112; for a specific rotational speed, compared with the original motor, the motor efficiency of the modified motor is significantly improved during operation, that is, through the structural improvement of the first rotor lamination 11, the high stability and low loss characteristics of the first rotor lamination 11 under high-speed operation can be achieved, thereby significantly improving the motor efficiency.

[0061] Among them, the second passages 112 on two adjacent first rotor laminations 11 can be at least partially staggered, which is convenient for enhancing the overall structural strength of the rotor core 100 and improving the motor efficiency. However, in other embodiments, only the mounting grooves 13 on two adjacent first rotor laminations 11 need to be docked to ensure the installation of the permanent magnet.

[0062] Please refer to Figure 3 and Figure 4 , in the embodiments of the present utility model, the plurality of first rotor laminations 11 at least include a first lamination 113 and a second lamination 114 stacked along the axial direction of the rotor core 100;

[0063] The number of the second passages 112 on the first punching sheet 113 is less than the number of the second passages 112 on the second punching sheet 114, wherein the number of the first passages 111 on the first punching sheet 113 is equal to the number of the first passages 111 on the second punching sheet 114, or the number of the first passages 111 on the first punching sheet 113 is less than the number of the first passages 111 on the second punching sheet 114; thus, it can not only ensure that the overall holding force of the formed rotor core 100 is relatively high, that is, it has better structural strength, but also reduce the loss of the rotor core 100 to a certain extent, reduce magnetic leakage, and further improve the motor efficiency. However, in other embodiments, the rotor punching sheet can be laminated with a punching sheet without the first passage 111 and / or the second passage 112 to form the rotor core 100.

[0064] Specifically, in the embodiment of the present invention, a plurality of the first punching sheets 113 are provided, at least one of the first punching sheets 113 is provided at each end of the rotor core 100, and the second punching sheet 114 is located between the two first punching sheets 113 respectively arranged at the two ends of the rotor core 100. Taking the number of the first passages 111 on the first punching sheet 113 being equal to the number of the first passages 111 on the second punching sheet 114 as an example, since the number of the second passages 112 on the first punching sheet 113 is less than the number of the second passages 112 on the second punching sheet 114, at this time, the structural strength of the first punching sheet 113 is higher than that of the second punching sheet 114. The second punching sheet 114 is arranged between the first punching sheets 113 at both ends to ensure the structural strength at both ends of the rotor core 100. Of course, in other embodiments, at least one of the second punching sheets 114 is provided at each end of the rotor core 100, and the first punching sheet 113 is located between the two second punching sheets 114 respectively arranged at the two ends of the rotor core 100.

[0065] Specifically, in the embodiment of the present invention, the number of the first punching sheets 113 is 2N1, the number of the second punching sheets 114 is N2, and 0.5 ≤ N2 / N1 ≤ 8. It can be understood that in order to ensure the structural stability of the rotor core 100, the same number of the first punching sheets 113 are provided at both ends of the rotor core 100, so that the specific number of the first punching sheets 113 is 2N1. The arrangement of the second punching sheets 114 can further reduce the loss and magnetic leakage of the rotor core 100 because the number of the second passages 112 on the second punching sheets 114 is more than the number of the second passages 112 on the first punching sheets 113, and the number of the first passages 111 on the second punching sheets 114 is more than or equal to the number of the first passages 111 on the first punching sheets 113, while reducing the weight of the rotor core 100, and effectively improving the motor efficiency and performance.

[0066] Specifically, when the ratio of N2 / N1 is too small, it is likely that the effect of improving efficiency cannot be significantly enhanced due to the too small number of the second punching sheets 114. When the ratio of N2 / N1 is too large, the total number of the first punching sheets 113 is less than the number of the second punching sheets 114, and it is likely that the overall structural strength of the rotor core 100 is affected due to the too large number of the second punching sheets 114. Therefore, it is defined that 0.5 ≤ N2 / N1 ≤ 8, and on the basis of ensuring the structural strength of the rotor core 100, the efficiency of the motor adopting the rotor core 100 is further improved. 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 refer to Figure 6 , in the embodiment of the present utility model, a plurality of the second punching sheets 114 are provided and arranged between the two first punching sheets 113 provided at both ends of the rotor core 100; that is, in the axial direction of the first rotor punching sheet 11, a plurality of the second punching sheets 114 are stacked and are all located between the respective first punching sheets 113 provided at both ends of the rotor core 100 to form the rotor core 100; wherein, according to 0.5 ≤ N2 / N1 ≤ 8, the numbers of the first punching sheets 113 and the second punching sheets 114 on the rotor core 100 are reasonably designed to obtain the rotor core 100 having high stability and low loss characteristics under high-speed operation.

[0068] Please refer to Figure 7 , in the embodiment of the present utility model, the rotor core 100 further includes a punching sheet combination 15 and the first punching sheet 113 provided at the end of the punching sheet combination 15; the punching sheet combination 15 includes the stacked first punching sheets 113 and the second punching sheets 114, and the number of the first punching sheets 113 at the end of the punching sheet combination 15 is equal to the number of the first punching sheets 113 within the punching sheet combination 15, so as to ensure the symmetric arrangement of the two first punching sheets 113 at both ends of the rotor core 100 and facilitate improving the structural stability of the rotor. The specific number of the punching sheet combinations 15 mainly depends on the thickness of the rotor core 100 in the axial direction and the performance requirements of the motor. Among them, one group or multiple groups of the punching sheet combinations 15 can be provided. However, in other embodiments, the positions of the first punching sheets 113 and the second punching sheets 114 can be interchangeably arranged.

[0069] Specifically, in an embodiment of the present utility model, within the punching sheet assembly 15, one first punching sheet 113 and one second punching sheet 114 are provided respectively, forming a punching sheet assembly 15 with high stability and low loss characteristics, which is convenient for the assembly of the rotor core 100. When multiple punching sheet assemblies 15 are provided, each punching sheet assembly 15 is stacked axially along the rotor core 100 in sequence, and one first punching sheet 113 is provided at the end of the stacked punching sheet assembly aggregate, ensuring the symmetry of the structure of the rotor core 100. Also, since the number of first passages 111 on the first punching sheet 113 is less than or equal to the number of first passages 111 on the second punching sheet 114, and the number of second passages 112 on the first punching sheet 113 is less than the number of second passages 112 on the second punching sheet 114, the structural strength at both ends of the rotor core 100 can be ensured.

[0070] Specifically, in another embodiment of the present utility model, within the punching sheet assembly 15, multiple first punching sheets 113 and multiple second punching sheets 114 are provided respectively, forming a punching sheet assembly 15 with high stability and low loss characteristics, which is convenient for the assembly of the rotor core 100. When multiple punching sheet assemblies 15 are provided, each punching sheet assembly 15 is stacked axially along the rotor core 100 in sequence, and multiple first punching sheets 113 are provided at the end of the stacked punching sheet assembly aggregate, ensuring the symmetry of the structure of the rotor core 100. Also, since the number of first passages 111 on the first punching sheet 113 is less than or equal to the number of first passages 111 on the second punching sheet 114, and the number of second passages 112 on the first punching sheet 113 is less than the number of second passages 112 on the second punching sheet 114, the structural strength at both ends of the rotor core 100 can be ensured. At this time, the specific number of groups of the punching sheet assembly 15 is (total number of punching sheets - number of first punching sheets 113 at the end) / 2 groups.

[0071] Please refer to Figure 5 、 Figures 8 to 9 In an embodiment of the present utility model, the rotor core 100 further includes at least one second rotor punching sheet 16 laminated with the first rotor punching sheet 11. The second rotor punching sheet 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 improving the structure of the first rotor punching sheet 11, the high stability and low loss characteristics of the rotor core 100 during high-speed operation can be improved, thereby significantly enhancing the motor efficiency.

[0072] The lamination of the first rotor punching sheet 11 and the second rotor punching sheet 16 can specifically refer to the lamination method of the first punching sheet 113 and the second punching sheet 114, that is, it can replace the first punching sheet 113 or the second punching sheet 114 to further improve the structural strength of the rotor core 100.

[0073] Please refer to Figure 1, in an embodiment of the present utility model, the installation groove 13 includes a first groove section 131 parallel to the radial direction of the rotor core 100 and two second groove sections 132 connected to opposite sides of the first groove section 131. The circulation hole 12 communicates with the first groove section 131, that is, the first groove section 131 extends in a direction parallel to the radial direction of the rotor core 100. The second groove section 132 is arranged at an angle with the first groove section 131, and its extending direction can intersect with the radial direction of the rotor core 100. The first passage 111 communicates the circulation hole 12 and the first groove section 131, which is convenient for realizing the symmetry of the structure, ensuring the uniform distribution of the magnetic field on the rotor punching sheet, thereby improving the running stability of the motor, reliably reducing noise, and also facilitating the optimization of the magnetic circuit on the first rotor punching sheet 11, improving the motor efficiency and motor performance; wherein, the installation groove 13 includes the first groove section 131 and two second groove sections 132, which can increase the magnetic flux to a certain extent, improve the magnetic field strength, and is also beneficial to improving the structural strength of the first rotor punching sheet 11 and extending the service life of the rotor core 100. However, in other embodiments, the installation groove 13 only includes the first groove section 131; or, the first groove section 131 and the two second groove sections 132 are both connected to the first passage 111. At this time, the shape of the circulation hole 12 is adapted to the formation of the installation groove 13.

[0074] Optionally, in an embodiment of the present utility model, a first permanent magnet is installed in the first groove section 131, and the length of the first permanent magnet is Lm1. A second permanent magnet is installed in the second groove section 132, and the length of the second permanent magnet is Lm2. 1.02 ≤ Lm1 / Lm2 ≤ 1.3. Among them, the length direction of the first permanent magnet is arranged parallel to the radial direction of the rotor core 100, which helps to generate a constant magnetic flux and is convenient for ensuring the stability of the magnetic field during high-speed operation. The length direction of the second permanent magnet is arranged at an angle with the radial direction of the rotor core 100, which is convenient for improving the 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, improving the running stability of the motor. Cooperating with the two symmetrically arranged second permanent magnets can also enhance the starting reliability of the motor. At the same time, it is also convenient for the motor to adapt to different working conditions and load requirements. Such a setting helps to improve the motor efficiency and motor performance.

[0075] Optionally, in an embodiment of the present utility model, an air groove 14 is provided on the first rotor punching sheet 11 between two adjacent installation grooves 13. The area of the air groove 14 is S, and 3 ≤ S ≤ 3.9. Specifically, when the area of the air groove 14 is less than 3, it is not conducive to reducing magnetic leakage. When the area of the air groove 14 is greater than 3.9, it is easy to reduce the structural strength of the rotor punching sheet. Therefore, limiting the area of the air groove 14 between 3 and 3.9 can not only reduce magnetic leakage and reduce the influence on the output torque, but also effectively ensure the structural strength of the rotor core 100, thereby improving the motor efficiency and motor performance.

[0076] Specifically, the specific values of the area S of the air groove 14 include, but are not limited to, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9. And, the cross-sectional shape of the air groove 14 can be circular or trapezoidal.

[0077] The present utility model also provides a rotor, which includes a rotor core 100. The specific structure of the rotor core 100 refers to the above embodiments. Since this rotor adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0078] The present utility model also provides a motor, which includes a rotor. The specific structure of the rotor refers to the above embodiments. Since this motor adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. Among them, each first rotor punching 11 is laminated through riveting holes to form a rotor core 100, a permanent magnet is installed in the installation groove 13, and a stator is fixed on the outer periphery of the rotor core 100.

[0079] The present utility model also provides a compressor, which includes a motor. The specific structure of the motor refers to the above embodiments. Since this compressor adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. Among them, the compressor can be applied in equipment such as air conditioners and refrigerators.

[0080] The above are only exemplary embodiments of the present utility model, and do 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 core, characterized in that: comprising a plurality of first rotor punching sheets stacked along the axial direction thereof; The first rotor punching sheet includes an axial hole arranged at the center of the first rotor punching sheet, and a plurality of mounting grooves arranged circumferentially along the axial hole. A plurality of flow holes are arranged between the mounting groove and the axial hole. At least part of the flow holes are connected to at least part of the mounting groove through a first passage. The flow holes and the first passage are arranged on the center line of the corresponding mounting groove. At least part of the flow holes are connected to the axial hole through a second passage. The second passage is arranged on the center line of the corresponding flow hole.

2. The rotor core according to 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 circulation hole is d2, where d1≤d2.

3. The rotor core according to claim 2, characterized in that: The width of the second passage at the circulation hole is d3, the width of the second passage at the shaft hole is d4, d4≤d3, and d2≤d3.

4. The rotor core according to claim 1, characterized in that: The number of pole pairs of the rotor core is P, the number of the first paths is K1, K1=P; Alternatively, K1=2P.

5. The rotor core according to claim 1, characterized in that: The number of pole pairs of the rotor core is P, the number of the second paths is K2, K2=P; Alternatively, K2=2P.

6. The rotor core according to claim 1, characterized in that: The number of first passages on the plurality of first rotor punchings is the same, and the number of second passages on the plurality of first rotor punchings is the same.

7. The rotor core according to claim 1, characterized in that: The plurality of first rotor punching sheets at least include first punching sheets and second punching sheets stacked in the axial direction of the rotor core; The number of the second passages on the first punch is less than the number of the second passages on the second punch.

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

9. The rotor core according to claim 7, characterized in that: A plurality of the first punching sheets are provided, and at least one first punching sheet is provided at each of the two ends of the rotor core. The second punching sheet is located between two first punching sheets provided at the two ends of the rotor core.

10. The rotor core according to claim 9, characterized in that: The number of the first punching sheets is 2N1, the number of the second punching sheets is N2, and 0.5≤N2 / N1≤8.

11. The rotor core according to claim 9, characterized in that: A plurality of second punching sheets are provided and arranged between two first punching sheets provided at two ends of the rotor core.

12. The rotor core according to claim 9, characterized in that: The rotor core further comprises a punching sheet assembly and the first punching sheet arranged at the end of the punching sheet assembly; The punching sheet assembly includes the first punching sheets and the second punching sheets stacked together, and the number of the first punching sheets located at the end of the punching sheet assembly is equal to the number of the first punching sheets located in the punching sheet assembly.

13. The rotor core according to claim 12, characterized in that: In the punching sheet assembly, each of the first punching sheet and the second punching sheet is provided with one; Alternatively, in the punching sheet assembly, a plurality of the first punching sheets and a plurality of the second punching sheets are provided.

14. The rotor core according to claim 13, characterized in that: The punching sheet assembly is provided in multiple groups.

15. The rotor core according to claim 1, characterized in that: The rotor core further includes at least one second rotor punching laminated with the first rotor punching, wherein the second rotor punching does not have the first passage and the second passage.

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

17. The rotor core according to claim 16, characterized in that: 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. 1.02≤Lm1 / Lm2≤1.

3.

18. The rotor core according to claim 1, characterized in that: The first rotor punching sheet is provided with an air slot located between two adjacent mounting slots, and the area of ​​the air slot is S, 3≤S≤3.

9.

19. A rotor, characterized in that: Comprising the rotor core according to any one of claims 1 to 18.

20. A motor, characterized in that: Comprising a rotor as claimed in claim 19.

21. A compressor, characterized in that: Comprising the motor as claimed in claim 20.

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