A damping rotor core, a damping rotor and a permanent magnet motor

Abstract

The present invention discloses a damping rotor core, a damping rotor and a permanent magnet motor. The damping rotor core includes: an outer rotor core, which includes a plurality of outer rotor punching sheet groups having different limiting structures, and the different limiting structures of the plurality of outer rotor punching sheet groups form a groove body with a notch on the inner side; an inner rotor core, which includes a plurality of inner rotor punching sheet groups having different limiting structures, and the different limiting structures of the plurality of inner rotor punching sheet groups form a boss corresponding to the groove body on the outer side of the inner rotor core; the boss is assembled into the groove body from the notch, and is limited in the axial direction and the tangential direction through the groove body; a damping body, which is injection molded in the gap between the outer rotor core and the inner rotor core. The present invention has the advantage of improving the stability between the inner and outer rotor cores by arranging a groove body and a boss at corresponding positions of the outer rotor core and the inner rotor core, and cooperating with the damping body to form limits in the axial direction and the tangential direction.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular, to a shock-absorbing rotor core, a shock-absorbing rotor, and a permanent magnet motor. Background Art

[0002] In the permanent magnet motor industry, in order to improve the motor noise and reduce the motor vibration, it is usually adopted to fill shock-absorbing materials inside the rotor to achieve the purpose of reducing vibration and thus improving the motor noise.

[0003] In the existing shock-absorbing rotor technology, the rotor core is usually divided into an inner rotor core and an outer rotor core, and symmetrically placed convex parts are provided at the corresponding places of the two parts, and shock-absorbing materials are filled in the gaps without convex parts, so as to complete the production of the shock-absorbing rotor.

[0004] However, for the shock-absorbing rotor under this technical solution, the limiting structure is usually only provided by the shock-absorbing material in the axial direction, while ignoring the limiting structure in the tangential direction. When the shock-absorbing material fails, due to the rotation of the motor, the shock-absorbing material may still fall off in the tangential direction, resulting in the separation of the inner and outer iron cores or the misalignment of the inner and outer rotor iron cores due to the aging of the shock-absorbing material in the inner rotor core, thus causing a series of motor failures and product failures. Summary of the Invention

[0005] The purpose of the present invention is to provide a shock-absorbing rotor core, a shock-absorbing rotor, and a permanent magnet motor, aiming to solve the problem that the limiting structure between the inner and outer rotor iron cores of the existing motor is not comprehensive and stable enough.

[0006] In a first aspect, an embodiment of the present invention provides a shock-absorbing rotor core, including:

[0007] An outer rotor core, including a plurality of outer rotor punching groups with different limiting structures, and the different limiting structures of the plurality of outer rotor punching groups form a groove body with a notch on the inner side of the outer rotor core;

[0008] An inner rotor core, including a plurality of inner rotor punching groups with different limiting structures, and the different limiting structures of the plurality of inner rotor punching groups form a boss corresponding to the groove body on the outer side of the inner rotor core;

[0009] The boss is assembled into the groove body from the notch, and is limited in the axial direction and the tangential direction through the groove body;

[0010] A shock-absorbing body, injection-molded in the gap between the outer rotor core and the inner rotor core.

[0011] Further, a plurality of the groove bodies are provided and are circumferentially and arrayed on the inner side, and a plurality of the bosses are provided and correspond to the plurality of groove bodies one by one.

[0012] Further, the outer rotor punching sheet group includes a first outer rotor punching sheet group composed of a plurality of first outer rotor punching sheets, and a first convex edge is provided inside the first outer rotor punching sheet group to form an axial primary limit.

[0013] Further, the outer rotor punching sheet group further includes a second outer rotor punching sheet group composed of a plurality of second outer rotor punching sheets stacked on top of each other. The second outer rotor punching sheet group is stacked on the first outer rotor punching sheet group, and a double convex edge corresponding to the first convex edge is provided inside the second outer rotor punching sheet group to form a tangential primary limit.

[0014] Further, the outer rotor punching sheet group further includes a third outer rotor punching sheet group composed of a plurality of third outer rotor punching sheets stacked on top of each other. The third outer rotor punching sheet group is stacked on the second outer rotor punching sheet, and a second convex edge corresponding to the double convex edge is provided inside the third outer rotor punching sheet group to form a tangential secondary limit.

[0015] Further, the outer rotor punching sheet group further includes a fourth outer rotor punching sheet group composed of a plurality of fourth outer rotor punching sheets stacked on top of each other. The fourth outer rotor punching sheet group is stacked on the first outer rotor punching sheet group, and the inner side of the fourth outer rotor punching sheet group is circular.

[0016] Further, the inner rotor punching sheet group includes a first inner rotor punching sheet group composed of a plurality of first inner rotor punching sheets stacked on top of each other, and the outer side of the first inner rotor punching sheet group is circular.

[0017] Further, the inner rotor punching sheet group further includes a second inner rotor punching sheet group composed of a plurality of second inner rotor punching sheets stacked on top of each other. The second inner rotor punching sheet group is stacked on the first inner rotor punching sheet group; the second convex tabs provided on the outer side of each second inner rotor punching sheet in the second inner rotor punching sheet group are stacked to form the convex platform.

[0018] Further, a first through hole is provided in the groove body in the axial direction, and a second through hole corresponding to the first through hole is provided in the convex platform in the axial direction.

[0019] Further, the shock absorber includes a limiting shaft formed in the first through hole and the second through hole to form a tangential tertiary limit.

[0020] Further, the shock absorber further includes a first limiting block formed at the notch position in the circumferential direction to form an axial secondary limit.

[0021] Further, the shock absorber further includes a first limiting ring formed between two adjacent groove bodies in the axial direction to form an axial tertiary limit.

[0022] Further, the shock absorber body further includes a second limiting block formed between two adjacent groove bodies in the circumferential direction to form a tangential four-level limit.

[0023] Further, the shock absorber body further includes a second limiting ring formed between the end face of the outer rotor iron core and the end face of the inner rotor iron core to form an axial four-level limit.

[0024] An embodiment of the present invention further provides a shock-absorbing rotor, including the shock-absorbing rotor iron core as described above, and further including a magnetic tile attached to the outside of the outer rotor iron core and a plastic sealing body sleeved on the outside of the outer rotor iron core.

[0025] An embodiment of the present invention further provides a permanent magnet motor, including the shock-absorbing rotor iron core as described above.

[0026] An embodiment of the present invention discloses a shock-absorbing rotor iron core, a shock-absorbing rotor and a permanent magnet motor. The shock-absorbing rotor iron core includes: an outer rotor iron core, including a plurality of outer rotor punching sheet groups with different limiting structures, and the different limiting structures of the plurality of outer rotor punching sheet groups form a groove body with a notch on the inner side of the outer rotor iron core; an inner rotor iron core, including a plurality of inner rotor punching sheet groups with different limiting structures, and the different limiting structures of the plurality of inner rotor punching sheet groups form a boss corresponding to the groove body on the outer side of the inner rotor iron core; the boss is assembled into the groove body from the notch, and is limited in the axial direction and the tangential direction through the groove body; a shock absorber body, injection-molded in the gap between the outer rotor iron core and the inner rotor iron core. By arranging a groove body and a boss at corresponding positions of the outer rotor iron core and the inner rotor iron core, and cooperating with the shock absorber body to form limits in the axial direction and the tangential direction, the embodiment of the present invention has the advantage of improving the stability between the inner and outer rotor iron cores. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is an exploded structural schematic diagram of the shock-absorbing rotor provided by the embodiment of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the outer rotor iron core provided by the embodiment of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the inner rotor iron core provided by the embodiment of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the shock absorber body provided by the embodiment of the present invention;

[0032] Figure 5 Structural schematic diagram of the first outer rotor punching sheet provided by an embodiment of the present invention;

[0033] Figure 6 Structural schematic diagram of the second outer rotor punching sheet provided by an embodiment of the present invention;

[0034] Figure 7 Structural schematic diagram of the third outer rotor punching sheet provided by an embodiment of the present invention;

[0035] Figure 8 Structural schematic diagram of the fourth outer rotor punching sheet provided by an embodiment of the present invention;

[0036] Figure 9 Structural schematic diagram of the first inner rotor punching sheet provided by an embodiment of the present invention;

[0037] Figure 10 Structural schematic diagram of the second inner rotor punching sheet provided by an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1. Outer rotor iron core; 10. Groove body; 101. First through hole; 11. First outer rotor punching sheet; 111. Axial primary limit; 12. Second outer rotor punching sheet; 121. Tangential primary limit; 13. Third outer rotor punching sheet; 131. Tangential secondary limit; 14. Fourth outer rotor punching sheet;

[0040] 2. Inner rotor iron core; 20. Boss; 201. Second through hole; 21. First inner rotor punching sheet; 22. Second inner rotor punching sheet; 221. Second tab;

[0041] 3. Shock absorber; 31. Tangential tertiary limit; 32. Axial secondary limit; 33. Axial tertiary limit; 34. Tangential quaternary limit; 35. Axial quaternary limit;

[0042] 4. Magnetic tile;

[0043] 5. Plastic sealing body. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0045] It should be understood that, as used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or their groups.

[0046] It should also be understood that the terminology used in this specification of the present invention is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in this specification of the present invention and the appended claims, unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0047] It should be further understood that the term " / and" used in this specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0048] As Figure 1-3 shown, the damping rotor core includes:

[0049] An outer rotor core 1, including a plurality of outer rotor punching sheet groups having different limiting structures, and different limiting structures of the plurality of outer rotor punching sheet groups form a groove body 10 with a notch on the inner side of the outer rotor core 1;

[0050] An inner rotor core 2, including a plurality of inner rotor punching sheet groups having different limiting structures, and different limiting structures of the plurality of inner rotor punching sheet groups form a boss 20 corresponding to the groove body 10 on the outer side of the inner rotor core 2;

[0051] The boss 20 is assembled into the groove body 10 from the notch, and is axially and tangentially limited by the groove body 10;

[0052] A damping body 3 is injection molded in the gap between the outer rotor core 1 and the inner rotor core 2.

[0053] In this embodiment, the outer rotor core 1 is composed of a plurality of outer rotor punching sheet groups with different limiting structures stacked, and the inner rotor core 2 is composed of a plurality of inner rotor punching sheet groups with different limiting structures stacked.

[0054] Wherein, the groove body 10 formed on the inner side of the outer rotor core 1 serves as a limiting structure. After the boss 20 on the inner rotor core 2 is assembled into the groove body 10 from the notch of the groove body 10, the groove body 10 limits the boss 20 on the inner rotor core 2 axially and tangentially to ensure the stability between the outer rotor core 1 and the inner rotor core 2.

[0055] The specific assembly process is as follows: First, the boss 20 of the inner rotor core 2 and the groove body 10 of the outer rotor core 1 are alternately placed. Then, the inner rotor core 2 is rotated so that its boss 20 first enters the groove body 10 from the gap of the groove body 10, and the inner rotor core 2 is axially adjusted so that its boss 20 is snapped into the inner space of the groove body 10. At this time, the inner rotor core 2 cannot be displaced in the tangential direction. Then, after injecting a high-temperature resistant damping material into the gap between the outer rotor core 1 and the inner rotor core 2 and forming it into a damping body 3, the inner rotor core 2 cannot be displaced in the axial direction either. Based on this, through the mutual restraint of the damping body 3, the outer rotor core 1 and the inner rotor core 2, the limit in both the axial direction and the tangential direction is achieved simultaneously, ensuring that the damping rotor core will not disassemble, so as to ensure the safety and stability of the motor during use.

[0056] It should be understood that the groove body 10 in this embodiment is a double-seven-shaped limit groove body with a notch formed by combining two "7"-shaped structures, that is, the cross-sectional shape of the notch of the groove body 10 is a square with a notch. Thus, after the boss 20 is assembled inside the groove body 10 and cooperates with the damping body 3 to form mutual restraint, the limiting effect of the outer rotor core 1 and the inner rotor core 2 in the axial direction and the tangential direction is effectively improved.

[0057] Combined with Figure 2 and Figure 3 , in one embodiment, a plurality of groove bodies 10 are provided and are circumferentially arrayed on the inner side, and a plurality of bosses 20 are provided and correspond to the plurality of groove bodies 10 one by one.

[0058] In this embodiment, by providing a plurality of groove bodies 10 corresponding to a plurality of bosses 20 for cooperation, the stability between the outer rotor core 1 and the inner rotor core 2 can be improved. Preferably, in this embodiment, 6 rows of groove bodies 10 and corresponding 6 rows of bosses 20 are provided in the circumferential direction, and the number of groove bodies 10 and bosses 20 in each row is 3, and this design has a good limiting effect.

[0059] The following is a more specific description of the limiting structure between the outer rotor core 1 and the inner rotor core 2:

[0060] In one embodiment, the outer rotor punching set includes a first outer rotor punching set, a second outer rotor punching set, a third outer rotor punching set, and a fourth outer rotor punching set;

[0061] Among them, the first outer rotor punching set is composed of a plurality of first outer rotor punchings 11 (refer to Figure 5 ), and the first convex edges are formed by stacking the first convex pieces arranged on the inner sides of the plurality of first outer rotor punchings 11 to form an axial primary limit 111;

[0062] Among them, the second outer rotor punching set is composed of a plurality of second outer rotor punchings 12 (refer to Figure 6) It is composed of superposition, and the double convex edges corresponding to the first convex edge are formed by the superposition of the convex points arranged on the inner sides of multiple second outer rotor punching sheets 12, so as to form the tangential first-level limit 121;

[0063] Among them, the third outer rotor punching sheet group is composed of multiple third outer rotor punching sheets 13 (refer to Figure 7 ) It is composed of superposition, and the second convex edge corresponding to the double convex edge is formed by the superposition of the convex points arranged on the inner sides of multiple third outer rotor punching sheets 13, so as to form the tangential second-level limit 131;

[0064] Among them, the fourth outer rotor punching sheet group is composed of multiple fourth outer rotor punching sheets 14 (refer to Figure 8 ) It is composed of superposition, and the inner side of each fourth outer rotor punching sheet 14 is circular.

[0065] In this embodiment, when the first outer rotor punching sheet group, the second outer rotor punching sheet group, and the third outer rotor punching sheet group are superposed and punched, the first convex edge, the double convex edge, and the second convex edge on them correspond to each other, so as to form the groove body 10 after punching.

[0066] The specific punching process of the groove body 10 is as follows: First, punch multiple first outer rotor punching sheets 11 to form the first outer rotor punching sheet group, and form the axial first-level limit 111 by the first convex edge on the first outer rotor punching sheet group; then punch multiple second outer rotor punching sheets 12 on the first outer rotor punching sheet group, so that the double convex edge on the formed second outer rotor punching sheet group forms the tangential first-level limit 121; then punch multiple third outer rotor punching sheets 13 on the second outer rotor punching sheet group, so that the second convex edge on the formed third outer rotor punching sheet group forms the tangential second-level limit 131; then punch multiple first outer rotor punching sheets 11 on the third outer rotor punching sheet group again, so that the currently formed first outer rotor punching sheet group forms a limit with the first outer rotor punching sheet group obtained by the first punching in the axial direction, that is, the axial first-level limit 111 composed of the front and rear parts. After punching, the groove body 10 can be formed by the first convex edge, the double convex edge, and the second convex edge, and the punching process of the fourth outer rotor punching sheet group is the punching process between the adjacent groove bodies 10 in the axial direction. Based on this, according to the quantity requirement of the groove body 10, repeating the above punching process can obtain the outer rotor iron core 1 with the groove body 10 jointly composed of the axial first-level limit 111, the tangential first-level limit 121, and the tangential second-level limit 131.

[0067] Combined with Figure 9 and Figure 10, in one embodiment, the inner rotor punching sheet group includes a plurality of first inner rotor punching sheet groups and a plurality of second inner rotor punching sheet groups; the first inner rotor punching sheet group is composed of a plurality of first inner rotor punching sheets 21 stacked, and the outer side of the first inner rotor punching sheet group is circular; the second inner rotor punching sheet group is composed of a plurality of second inner rotor punching sheets 22 stacked; the second tabs 221 provided on the outer side of each second inner rotor punching sheet 22 in the second inner rotor punching sheet group are stacked to form a boss 20.

[0068] In this embodiment, the specific punching process of the boss 20 is as follows: first punch a plurality of first inner rotor punching sheets 21 to form a first inner rotor punching sheet group, and then punch a plurality of second inner rotor punching sheets 22 on the first inner rotor punching sheet group to form a stack of the first inner rotor punching sheet group and the second inner rotor punching sheet group. At this time, a plurality of second tabs 221 on the outer side of the obtained second inner rotor punching sheet group can form the boss 20; based on this, according to the quantity requirement of the boss 20, the inner rotor core 2 with the boss 20 can be obtained by alternately punching the first inner rotor punching sheet group and the second inner rotor punching sheet group.

[0069] Based on the obtained outer rotor core 1 and inner rotor core 2, after assembling the inner rotor core 2 into the outer rotor core 1 according to the assembly process of the above embodiment, the boss 20 is finally stuck in the recess of the concave structure with axial and tangential limits formed by the first outer rotor punching sheet group and the second outer rotor punching sheet group. At this time, the outer rotor core 1 and the inner rotor core 2 cannot rotate relative to each other, which can be regarded as the boss 20 being combined with the groove body 10 in place, so as to facilitate the subsequent injection molding of the shock absorber 3.

[0070] In one embodiment, a first through hole 101 is provided on the groove body 10 along the axial direction, and a second through hole 201 corresponding to the first through hole 101 is provided on the boss 20 along the axial direction.

[0071] In this embodiment, it can also be known whether the boss 20 is combined with the groove body 10 in place by judging whether the axes of the first through hole 101 and the second through hole 201 coincide, that is, if the axes coincide, it is regarded as being combined in place. At the same time, the first through hole 101 and the second through hole 201 also serve as positioning feeding holes, and the plastic shock-absorbing material is injected into the gap between the outer rotor core 1 and the inner rotor core 2 through the positioning feeding holes and formed into the shock absorber 3.

[0072] The following specifically introduces the injection-molded shock absorber 3:

[0073] The shock absorber 3 includes a limiting shaft formed in the first through hole 101 and the second through hole 201 to form a tangential three-stage limit 31;

[0074] The shock absorber 3 further includes a first limiting block formed at the notch position in the circumferential direction to form an axial two-stage limit 32;

[0075] The shock-absorbing body 3 further includes a first limiting ring formed between two adjacent groove bodies 10 in the axial direction to form an axial three-stage limit 33;

[0076] The shock-absorbing body 3 further includes a second limiting block formed between two adjacent groove bodies 10 in the circumferential direction to form a tangential four-stage limit 34;

[0077] The shock-absorbing body 3 further includes a second limiting ring formed between the end face of the outer rotor iron core 1 and the end face of the inner rotor iron core 2 to form an axial four-stage limit 35.

[0078] The shock-absorbing body 3 based on injection molding avoids excessive direct contact between the outer rotor iron core 1 and the inner rotor iron core 2, enhances the effect of shock absorption, and realizes the anti-loosening effect of the outer rotor iron core 1 and the inner rotor iron core 2 through the formed multi-stage limiting structure, ensuring the more reliable and long-term operation of the motor and improving the reliability of the motor.

[0079] The embodiment of the present invention further provides a shock-absorbing rotor, as Figure 1 shown, including the shock-absorbing rotor iron core as described above, and further including a magnetic tile 4 attached to the outer side of the outer rotor iron core 1 and a plastic sealing body 5 sleeved on the outer side of the outer rotor iron core 1.

[0080] In this embodiment, a plurality of ribs can be arranged on the outer side of the outer rotor iron core 1 in the circumferential direction, and the adjacent ribs directly form magnetic tile positions. A plurality of magnetic tiles 4 are attached to the corresponding magnetic tile positions along the circumferential direction, and then plastic sealing material is injected at the joint between the magnetic tile 4 and the outer side of the outer rotor iron core 1 and formed into a plastic sealing body 5. Finally, the outer rotor iron core 1, the inner rotor iron core 2 and the magnetic tile 4 are formed into one body through the plastic sealing body 5 and the shock-absorbing body 3 to complete the production of the shock-absorbing rotor.

[0081] The embodiment of the present invention further provides a permanent magnet motor, including the shock-absorbing rotor iron core as described above.

[0082] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described devices, apparatuses and units can refer to the corresponding processes in the foregoing method embodiments, and will not be described herein again.

[0083] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A damping rotor core, characterized in that, Comprising: An outer rotor iron core, including a plurality of outer rotor punching sheet groups with different limiting structures, and different limiting structures of the plurality of outer rotor punching sheet groups form a grooved body with a notch on the inner side of the outer rotor iron core; wherein, the grooved body is a double-seven-shaped limiting groove body with a notch formed by combining two "7"-shaped structures. An inner rotor iron core, including a plurality of inner rotor punching sheet groups with different limiting structures, and different limiting structures of the plurality of inner rotor punching sheet groups form a boss corresponding to the grooved body on the outer side of the inner rotor iron core. The inner rotor iron core is used to rotate after the boss is staggeredly placed into the grooved body, so as to drive the boss to enter the grooved body from the notch of the grooved body, and perform axial adjustment to make the boss snap into the inner space of the grooved body, thereby forming a limit on the boss in the axial direction and the tangential direction. A shock absorber body, injection-molded in the gap between the outer rotor iron core and the inner rotor iron core.

2. The shock-absorbing rotor core according to claim 1, wherein: A plurality of the grooved bodies are provided and are circumferentially arrayed on the inner side, and a plurality of the bosses are provided and correspond to the plurality of grooved bodies one by one.

3. The shock-absorbing rotor core according to claim 1, characterized in that: The outer rotor punching sheet group includes a first outer rotor punching sheet group formed by stacking a plurality of first outer rotor punching sheets, and a first convex edge is provided on the inner side of the first outer rotor punching sheet group to form an axial primary limit.

4. The shock-absorbing rotor core according to claim 3, wherein: The outer rotor punching sheet group further includes a second outer rotor punching sheet group formed by stacking a plurality of second outer rotor punching sheets, the second outer rotor punching sheet group is stacked on the first outer rotor punching sheet group, and a double convex edge corresponding to the first convex edge is provided on the inner side of the second outer rotor punching sheet group to form a tangential primary limit.

5. The shock-absorbing rotor core according to claim 4, characterized in that: The outer rotor punching sheet group further includes a third outer rotor punching sheet group formed by stacking a plurality of third outer rotor punching sheets, the third outer rotor punching sheet group is stacked on the second outer rotor punching sheet, and a second convex edge corresponding to the double convex edge is provided on the inner side of the third outer rotor punching sheet group to form a tangential secondary limit.

6. The damping rotor core according to claim 5, wherein: The outer rotor punching sheet group further includes a fourth outer rotor punching sheet group formed by stacking a plurality of fourth outer rotor punching sheets, the fourth outer rotor punching sheet group is stacked on the first outer rotor punching sheet group, and the inner side of the fourth outer rotor punching sheet group is circular.

7. The damping rotor core according to claim 1, wherein: The inner rotor punching sheet group includes a first inner rotor punching sheet group formed by stacking a plurality of first inner rotor punching sheets, and the outer side of the first inner rotor punching sheet group is circular.

8. The damping rotor core according to claim 7, wherein: The inner rotor punching sheet group further includes a second inner rotor punching sheet group formed by stacking a plurality of second inner rotor punching sheets, the second inner rotor punching sheet group is stacked on the first inner rotor punching sheet group; second convex tabs provided on the outer side of each second inner rotor punching sheet in the second inner rotor punching sheet group are stacked to form the boss.

9. The damping rotor core according to claim 1, characterized in that: A first through hole is provided on the grooved body in the axial direction, and a second through hole corresponding to the first through hole is provided on the boss in the axial direction.

10. The shock-absorbing rotor core according to claim 9, characterized in that: The shock absorber body includes a limiting shaft formed in the first through hole and the second through hole to form a tangential tertiary limit.

11. The shock-absorbing rotor core according to claim 1, wherein: The shock absorber body further includes a first limiting block formed at the notch position in the circumferential direction to form an axial secondary limit.

12. The shock-absorbing rotor core according to claim 1, wherein: The shock absorber body further includes a first limiting ring formed between two adjacent grooved bodies in the axial direction to form an axial tertiary limit.

13. The shock-absorbing rotor core according to claim 1, wherein: The shock-absorbing body further includes a second limiting block formed between two adjacent groove bodies in the circumferential direction to form a tangential four-level limit.

14. The shock-absorbing rotor core according to claim 1, wherein: The shock-absorbing body further includes a second limiting ring formed between the end face of the outer rotor core and the end face of the inner rotor core to form an axial four-level limit.

15. A shock-absorbing rotor, characterized in that: It includes a shock-absorbing rotor core as described in any one of claims 1 to 14, and further includes a magnetic tile attached to the outside of the outer rotor core and a plastic-sealed body injection-molded between the outside of the outer rotor core and the magnetic tile.

16. A permanent magnet motor, characterized in that: It includes a shock-absorbing rotor as described in claim 15.

Images