Damping motor rotor, motor and air conditioner

Abstract

This invention provides a vibration-damping motor rotor, a motor, and an air conditioner. The vibration-damping motor rotor includes: an inner core, comprising a core base circle and a plurality of first protrusions protruding radially outward along the inner core, the first protrusions being evenly spaced around the central axis of the inner core, and each first protrusion having an axial limiting groove; an outer core assembly; a plastic sheath covering the outer surface of the outer core assembly, the plastic sheath having a central through hole accommodating the inner core, a filling channel forming between the central through hole and the radially outer side wall of the inner core, and a plurality of axial limiting protrusions forming on the wall of the central through hole, each axial limiting protrusion being inserted into a corresponding axial limiting groove; and a vibration-damping structure including a first vibration-damping part, the first vibration-damping part being injection-molded and filled into the filling channel formed between the outer core assembly and the inner core. In this invention, the outer core assembly and the inner core are mechanically engaged axially, thereby effectively improving the axial strength of the rotor.

Description

Technical Field

[0001] This invention belongs to the field of motor design technology, specifically relating to a shock-absorbing motor rotor, a motor, and an air conditioner. Background Technology

[0002] To reduce motor vibration and noise, and increase motor stability, lifespan, and user comfort, vibration-damping rotors are commonly used in motors. Embedded tangential vibration-damping rotors are widely used because they reduce motor vibration and noise while ensuring the utilization rate of the magnets, thus improving motor performance. Embedded vibration-damping rotors typically add a damping structure between the inner and outer rotor cores. This structure absorbs the motor's vibration energy, thereby reducing vibration and noise. However, traditional embedded tangential vibration-damping rotors often face the problem of excessive stress on the damping structure at the intersection of the inner rotor core and the plastic-coated bosses. This can lead to significant deformation or even cracking of the damping structure, resulting in reduced vibration damping effectiveness and even increased noise. Furthermore, vibration-damping rotors are prone to delamination during operation, placing higher demands on the overall strength of the rotor.

[0003] Patent CN 216356157 U discloses a vibration-damping rotor assembly with a special shaft and inner rotor core. The vibration-damping rotor comprises a shaft, a vibration-damping structure, inner and outer rotor cores, and magnetic tiles. The shaft has an annular boss that contacts the vibration-damping structure, driving its rotation. Simultaneously, the shaft can also drive the inner rotor core to rotate the vibration-damping structure. Compared to traditional vibration-damping rotor solutions, this patented vibration-damping rotor assembly enhances the overall strength of the rotor and reduces material costs through structural design of the shaft and inner rotor core. However, it still suffers from problems such as the vibration-damping structure being prone to breakage and the overall structural strength of the rotor being relatively low.

[0004] Patent CN 112737169 A discloses a vibration-damping rotor structure, characterized by comprising: a body structure including an outer iron core, a magnet, and a support frame, wherein the outer iron core and the magnet are both mounted on the support frame; the support frame has a through hole; the inner wall of the through hole is provided with a plurality of first protrusions, which are spaced apart along a direction surrounding a predetermined axis; the outer wall of the inner iron core is provided with a plurality of second protrusions, which are spaced apart along a direction surrounding the predetermined axis; at least a portion of the vibration-damping element is made of an elastomeric material. Compared to traditional vibration-damping rotor designs, this patented vibration-damping rotor can reduce structural vibration and noise through the design of the outer iron core and vibration-damping structure, but it still suffers from problems such as significant magnetic leakage and axial delamination.

[0005] Patent CN110311491A discloses a low-leakage magnetic flexible rotor structure, characterized by comprising: two outer rotor cores, an inner rotor core, a plastic coating, and magnetic tiles; the inner rotor core includes a generally cylindrical main body and multiple radially protruding portions generally evenly distributed on the sides of the main body; the first and second outer rotor cores are arranged circumferentially; the first outer rotor core has a notch formed on its inner circumferential surface; the notch is adapted to mate with the radially protruding portions of the inner rotor core; the outer rotor core, inner rotor core, and magnetic tiles are injection molded into a single unit by the plastic coating, which is made of silicone rubber. Compared to traditional vibration-damping rotor solutions, this patent uses silicone rubber for the rotor's plastic coating, thereby reducing tangential vibration and noise. Simultaneously, the structural design of the inner and outer rotor cores increases the rotor's axial strength. However, it also suffers from lower tangential rotor strength and the susceptibility of the vibration-damping rubber to cracking. Summary of the Invention

[0006] Therefore, the present invention provides a shock-absorbing motor rotor, a motor, and an air conditioner, which can solve the technical problem of low axial strength of the shock-absorbing motor rotor in the prior art.

[0007] To address the above problems, the present invention provides a vibration-damping motor rotor, comprising:

[0008] The inner core includes a core base circle and a plurality of first protrusions that protrude radially outward along the inner core. Each first protrusion is evenly spaced around the central axis of the inner core and has an axial limiting groove.

[0009] External core assembly; -

[0010] A plastic cover is wrapped around the outer surface of the outer core assembly. The plastic cover has a central through hole for accommodating the inner core. A filling channel is formed between the central through hole and the radial outer side wall of the inner core. A plurality of axial limiting bosses are formed on the hole wall of the central through hole. Each of the axial limiting bosses is inserted into the axial limiting groove in a corresponding manner.

[0011] The shock-absorbing structure includes a first shock-absorbing part, which is injection molded into a filling channel formed between the outer iron core assembly and the inner iron core.

[0012] In some implementations...

[0013] The axial thickness of the axial limiting boss is d3, where 2mm ≤ d3 ≤ 5mm; and / or,

[0014] There is a first gap between the top surface of the axial limiting boss and the bottom wall of the axial limiting groove, and the first damping part has a portion that fills the first gap; and / or, the axial limiting boss is inserted into the axial limiting groove with a clearance fit, and the first damping part has a portion that fills the gap between the two.

[0015] In some implementations...

[0016] Multiple second protrusions are also formed on the wall of the central through hole. Each second protrusion extends through both ends of the central through hole along its axial direction, and each second protrusion and each first protrusion are staggered in the circumferential direction of the inner iron core.

[0017] In some implementations...

[0018] The sides of the second boss and the opposite side of the first boss are parallel to each other.

[0019] In some implementations...

[0020] The outer core assembly has multiple first through holes penetrating both ends of it, and the first through holes penetrate the plastic casing. The inner core has multiple second through holes penetrating both ends of it. The damping structure further includes a second damping part, which includes an end plate corresponding to the end of the rotor of the damping motor, a first damping column passing through the first through hole, and a second damping column passing through the second through hole. Each first damping column and the second damping column are connected between the two end plates, and the first damping part is connected between the two end plates.

[0021] In some implementations...

[0022] The first through hole and the second through hole are both evenly spaced around the central axis of the inner iron core.

[0023] In some implementations...

[0024] Projected along the axial direction of the inner core, each of the first bosses is fan-shaped, and the outer arc length of the fan-shaped ring is greater than the inner arc length. The central angle of the fan-shaped ring is θ, 10°≤θ≤90°; and / or, the chord length corresponding to the inner arc is d1, d1=2π×R2 / n×(20%~50%), where n is the number of the first bosses in the inner core, and R2 is the radius of the base circle of the core.

[0025] In some implementations...

[0026] Projected along the axial direction of the inner core, the chord length corresponding to the outer ring arc is d4, and the radial height of the first boss is d2, where d2 = R1 - R2.

[0027]

[0028] Where R1 is the radius corresponding to the outer ring arc; and / or,

[0029] The radial width of the second through hole is d5, where d5 ≤ 0.5 × d1.

[0030] In some implementations...

[0031] The inner core includes a first core segment, a second core segment, and a third core segment stacked sequentially along its axial direction. The first boss is constructed on the outer circumferential wall of the first core segment and the second core segment. The axial limiting groove is located on the second core segment. The first core segment and the third core segment are formed by stacking multiple first laminations, and the second core segment is formed by stacking multiple second laminations.

[0032] The present invention also provides an electric motor, including the above-described shock-absorbing motor rotor.

[0033] The present invention also provides an air conditioner, including the motor described above.

[0034] The present invention provides a shock-absorbing motor rotor, a motor, and an air conditioner, which have the following beneficial effects:

[0035] The central through hole of the plastic-coated core has an axial limiting boss on its wall. This axial limiting boss can be inserted into the axial limiting groove on the first boss of the inner core, thereby realizing the mechanical engagement of the outer core assembly and the inner core in the axial direction, effectively improving the axial strength of the rotor, and effectively reducing the probability of axial delamination of the shock absorption structure. Attached Figure Description

[0036] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0037] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0038] Figure 1This is a three-dimensional structural schematic diagram of the rotor of the shock-absorbing motor in an embodiment of the present invention;

[0039] Figure 2 for Figure 1 A schematic diagram of the exploded structure of the rotor of the vibration damping motor;

[0040] Figure 3 for Figure 2 A three-dimensional structural diagram of the inner iron core;

[0041] Figure 4 for Figure 3 Schematic diagram of the laminations of the first and third core sections;

[0042] Figure 5 for Figure 3 A schematic diagram of the laminations in the second core section;

[0043] Figure 6 for Figure 2 Cross-sectional view of the damping structure in the middle;

[0044] Figure 7 for Figure 1 A cross-sectional view of the rotor of the vibration-damping motor in the image;

[0045] Figure 8 for Figure 7 Cross-sectional view of AA in the middle;

[0046] Figure 9 for Figure 8 A magnified view of a section at point A in the middle;

[0047] Figure 10 for Figure 7 Cross-sectional view of BB in the middle.

[0048] The reference numerals in the attached figures are as follows:

[0049] 1. Inner core; 101. First core segment; 102. Second core segment; 103. Third core segment; 11. First boss; 12. Axial limiting groove; 13. Second through hole; 2. Outer core assembly; 21. Core split; 211. First split; 212. Second split; 22. Magnet; 23. First through hole; 24. Third through hole; 25. Radial outer end limiting protrusion; 26. Radial inner end limiting protrusion; 3. Plastic coating; 31. Axial limiting boss; 32. Second boss; 4. Vibration damping structure; 40. First damping part; 41. End plate; 42. First damping column; 43. Second damping column; 44. Glue filling hole. Detailed Implementation

[0050] 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 some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0052] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0053] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0054] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0055] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0056] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0057] See also Figures 1 to 10 As shown, according to an embodiment of the present invention, a vibration damping motor rotor is provided, comprising:

[0058] The inner core 1 includes a core base circle (not labeled in the figure) and a plurality of first protrusions 11 that protrude radially outward along the inner core 1. Each first protrusion 11 is evenly spaced around the central axis of the inner core 1. In a preferred embodiment, the aforementioned first protrusions 11 extend axially along the inner core 1 to two end faces. Each first protrusion 11 has an axial limiting groove 12, that is, the axial limiting groove 12 is located in the middle region of the length direction of the first protrusion 11. In a feasible embodiment, each first protrusion 11 may be provided with a plurality of the aforementioned axial limiting grooves 12, and the plurality of axial limiting grooves 12 are spaced apart along the length direction of the first protrusion 11.

[0059] Outer core assembly 2;

[0060] Plastic wrapping 3 is wrapped around the outer surface of the outer iron core assembly 2. Plastic wrapping 3 has a central through hole (not marked in the figure) for accommodating the inner iron core 1. A filling channel (not marked in the figure) is formed between the central through hole and the radial outer side wall of the inner iron core 1. A plurality of axial limiting bosses 31 are formed on the hole wall of the central through hole. Each of the axial limiting bosses 31 is inserted into the axial limiting groove 12 in a corresponding manner.

[0061] The shock-absorbing structure 4 includes a first shock-absorbing part 40, which is injection molded into the filling channel formed between the outer iron core assembly 2 and the inner iron core 1. It can typically be formed by injection molding rubber.

[0062] In this technical solution, the wall of the central through hole of the plastic coating 3 has an axial limiting boss 31. The axial limiting boss 31 can be inserted into the axial limiting groove 12 on the first boss 11 of the inner iron core 1, thereby realizing the mechanical engagement of the outer iron core assembly 2 and the inner iron core 1 in the axial direction, effectively improving the axial strength of the rotor, and effectively reducing the probability of axial delamination of the shock absorption structure 4.

[0063] See details Figure 7 As shown, in order to ensure the structural stability of the axial limiting boss and good vibration and noise reduction performance, in some embodiments, the axial thickness of the axial limiting boss 31 is d3, where 2mm≤d3≤5mm.

[0064] In one specific embodiment, the top surface of the axial limiting boss 31 (i.e., the side opposite to the bottom wall of the axial limiting groove 12) and the bottom wall of the axial limiting groove 12 have a first gap. The first damping part 40 has a portion filling the first gap, and the radial thickness of this portion is preferably not less than 0.5 mm. This forms a rigid engagement between the outer core and the inner core 1 in the axial direction, achieving reliable axial limiting and also having a high radial buffering effect. This ensures that the radial electromagnetic force waves generated by the air gap and transmitted from the outer rotor core to the inner rotor core can be fully buffered and absorbed, achieving vibration reduction and noise reduction effects. In another preferred embodiment, the axial limiting boss 31 is inserted into the axial limiting groove 12 with a clearance fit, and the first damping part 40 has a portion filling the gap between them, i.e., see [reference] Figure 7 As shown, the upper, lower, front, rear and left sides of each axial limiting boss 31 are filled with corresponding damping material, thus forming a damping and buffering connection between the outer iron core and the inner iron core 1, resulting in better damping and noise reduction.

[0065] In a preferred embodiment, a plurality of second protrusions 32 are formed on the wall of the central through hole, each second protrusion 32 extending through both ends of the central through hole along its axial direction, and each second protrusion 32 and each first protrusion 11 are staggered in the circumferential direction of the inner iron core 1.

[0066] In this technical solution, the first boss 11 and the second boss 32 are arranged in an alternating manner in the circumferential direction. After the first damping part 40 is filled between them, the first boss 11 and the second boss 32 are engaged in the circumferential direction, thereby further improving the tangential force bearing capacity of the rotor while ensuring the axial strength of the rotor, further ensuring the connection reliability between the inner core 1 and the outer core assembly 2, and thus ensuring the synchronous rotation of the inner and outer core assemblies.

[0067] In some embodiments, the second boss 32 is parallel to the opposite side of the first boss 11.

[0068] In this technical solution, the parallel arrangement of the opposing sides of the two bosses increases the contact area between the first boss 11, the second boss 32 and the damping structure 4 under load, increases the force-bearing area of ​​the bosses under load, reduces the maximum stress and maximum deformation of the damping structure 4, avoids the breakage of the damping structure 4, and increases the stability of the damping rotor.

[0069] In some embodiments, the outer core assembly 2 has a plurality of first through holes 23 penetrating both ends of the outer core assembly 2, the first through holes 23 penetrating the plastic casing 3, the inner core 1 has a plurality of second through holes 13 penetrating both ends of the inner core assembly 1, and the damping structure 4 further includes a second damping part, the second damping part including an end plate 41 corresponding to the end of the damping motor rotor, a first damping column 42 passing through the first through holes 23, and a second damping column 43 passing through the second through holes 13, each of the first damping columns 42 and the second damping columns 43 being connected between the two end plates 41, and the first damping part 40 being connected between the two end plates 41.

[0070] In this technical solution, the end plates 41 at both ends of the rotor are connected into a whole by the first damping column 42 and the second damping column 43 passing through both ends of the rotor. At the same time, the two ends of the first damping part 40 are also connected to the two end plates 41 mentioned above, so that the damping structure 4 forms an organic damping whole similar to a rat cage. This effectively increases the radial inner end wrapping connection strength of the damping structure 4 to the inner and outer iron cores and magnetic tiles 22, and solves the problem of easy delamination of the damping rotor.

[0071] In some embodiments, the first through hole 23 and the second through hole 13 are evenly spaced around the central axis of the inner iron core 1 to further improve the dynamic balance of the rotor mass.

[0072] See details Figure 9 As shown, in some embodiments, along the axial projection of the inner core 1, each of the first bosses 11 is fan-shaped, and the outer arc length of the fan-shaped ring is greater than the inner arc length. The central angle of the fan-shaped ring is θ, 10°≤θ≤90°. As mentioned above, the parallel structure design of the corresponding first bosses 11 and second bosses 32 can reduce the stress and strain of the damping structure 4 under motor load, realize the reliable engagement of the two bosses in the tangential direction, and avoid the detachment and breakage of the damping structure 4.

[0073] The chord length corresponding to the inner ring arc is d1, where d1 = 2π × R2 / n × (20% ~ 50%), n is the number of the first bosses 11 of the inner iron core 1, and R2 is the radius of the base circle of the iron core.

[0074] In some implementations...

[0075] Projected along the axial direction of the inner core 1, the chord length corresponding to the outer ring arc is d4, and the radial height of the first boss 11 is d2, where d2 = R1 - R2.

[0076]

[0077] Wherein, R1 is the radius corresponding to the outer ring arc. This ensures the mechanical strength of the first boss 11 and improves its ability to withstand the radial and tangential electromagnetic forces of the motor.

[0078] To ensure the strength of the first boss 11, in some embodiments, the radial width of the second through hole 13 is d5, where d5 ≤ 0.5 × d1, and the second through hole 13 is symmetrical about the central symmetry line of the first boss 11. The aforementioned second through hole 13 is filled with damping adhesive to increase the rotor's vibration damping and noise reduction performance and tangential strength.

[0079] In some embodiments, the inner core 1 includes a first core segment 101, a second core segment 102, and a third core segment 103 stacked sequentially along its axial direction. The first boss 11 is formed on the outer circumferential wall of the first core segment 101 and the second core segment 102. The axial limiting groove 12 is located on the second core segment 102. The first core segment 101 and the third core segment 103 are formed by stacking multiple first laminations, and the second core segment 102 is formed by stacking multiple second laminations. By stacking different laminations to form corresponding core segments and then assembling them again to form the inner core 1 of this application, manufacturing is simple.

[0080] See details Figure 5 and Figure 8As shown, the outer core assembly 2 includes multiple core segments 21 and magnetic tiles 22. Each core segment 21 specifically includes multiple first segments 211 and second segments 212 spaced apart along the circumference. Adjacent first segments 211 and second segments 212 form magnetic slots. Each magnetic tile 22 is disposed within each magnetic slot, thus making the shock-absorbing motor rotor of the present invention an embedded tangential shock-absorbing rotor. See details [link to documentation]. Figure 8 As shown, the outer radial ends of the first split 211 and the second split 212 are provided with radially outer end limiting protrusions 25 for limiting the radially outer end of the magnetic tile 22, while the inner radial end of the second split 212 is provided with radially inner end limiting protrusions 26 for limiting the radially inner end of the magnetic tile 22. Meanwhile, the inner radial end of the first split 211 does not have a corresponding magnetic tile limiting structure. This increases the distance between the inner radial ends of the two splits, reduces the leakage flux of the motor, and increases the power density of the motor.

[0081] In some embodiments, each of the core segments 21 also has a plurality of third through holes 24 extending through both ends thereto, and the third through holes 24 are located radially outside the first through holes 23, with part of the plastic coating 3 filling the third through holes 24.

[0082] In this technical solution, by filling part of the plastic coating 3 into the third through hole 24, the wrapping connection of the plastic coating 3 to the outer iron core assembly 2 is made more reliable. It should be noted that there are multiple glue-filling holes 44 at the end of the shock-absorbing structure 4, which are located between the inner iron core 1 and the outer iron core (i.e., the aforementioned filling channel position), for filling with shock-absorbing glue to improve the rotor's vibration and noise reduction and overall connection strength. The inner and outer iron cores are integrated into a whole through the two end faces of the shock-absorbing structure 4, increasing the axial strength of the shock-absorbing structure 4. The first shock-absorbing part 40 reduces the rotor's vibration and noise by absorbing the kinetic energy in the tangential direction of the rotor.

[0083] The material of the aforementioned shock-absorbing structure 4 can be one of EPDM, silicone rubber, or neoprene rubber; the plastic coating 3 can be PBT or PA66 material, with an appropriate amount of glass fiber added to the material to increase strength.

[0084] According to an embodiment of the present invention, an electric motor is also provided, including the above-described shock-absorbing motor rotor.

[0085] According to an embodiment of the present invention, an air conditioner is also provided, including the motor described above.

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A vibration-damping motor rotor, characterized in that, include: The inner core (1) includes a core base circle and a plurality of first protrusions (11) that protrude radially outward along the inner core (1). Each first protrusion (11) is evenly spaced around the central axis of the inner core (1). Each first protrusion (11) has an axial limiting groove (12) that extends through both sides of each first protrusion (11) along the circumferential direction of the inner core (1). Outer core assembly (2); A plastic wrapping (3) is wrapped around the outer surface of the outer core assembly (2). The plastic wrapping (3) has a central through hole for accommodating the inner core (1). A filling channel is formed between the central through hole and the radial outer side wall of the inner core (1). A plurality of axial limiting bosses (31) are formed on the hole wall of the central through hole. Each of the axial limiting bosses (31) is inserted into each of the axial limiting grooves (12) in a corresponding manner. The shock-absorbing structure (4) includes a first shock-absorbing part (40), which is injection molded into the filling channel formed between the outer iron core assembly (2) and the inner iron core (1); The axial limiting boss (31) is fitted into the axial limiting groove (12) with a clearance fit, and the first damping part (40) has a portion that fills the gap between the two.

2. The vibration-damping motor rotor according to claim 1, characterized in that, The axial thickness of the axial limiting boss (31) is d3. .

3. The vibration-damping motor rotor according to claim 1 or 2, characterized in that, Multiple second protrusions (32) are also formed on the wall of the central through hole. Each second protrusion (32) extends through both ends of the central through hole along its axial direction. Each second protrusion (32) and each first protrusion (11) are intersected in the circumferential direction of the inner iron core (1).

4. The vibration-damping motor rotor according to claim 3, characterized in that, The sides of the second boss (32) and the first boss (11) are parallel to each other.

5. The vibration-damping motor rotor according to claim 3, characterized in that, The outer core assembly (2) has a plurality of first through holes (23) penetrating its two ends, the first through holes (23) penetrating the plastic casing (3), the inner core (1) has a plurality of second through holes (13) penetrating its two ends, the shock-absorbing structure (4) further includes a second shock-absorbing part, the second shock-absorbing part includes an end plate (41) corresponding to the end of the rotor of the shock-absorbing motor, a first shock-absorbing column (42) passing through the first through hole (23), and a second shock-absorbing column (43) passing through the second through hole (13), each of the first shock-absorbing columns (42) and the second shock-absorbing columns (43) being connected between the two end plates (41), and the first shock-absorbing part (40) being connected between the two end plates (41).

6. The vibration-damping motor rotor according to claim 5, characterized in that, The first through hole (23) and the second through hole (13) are both evenly spaced around the central axis of the inner iron core (1).

7. The vibration-damping motor rotor according to claim 6, characterized in that, Projected along the axial direction of the inner core (1), each of the first bosses (11) is fan-shaped, and the outer arc length of the fan-shaped ring is greater than the inner arc length, and the central angle of the fan-shaped ring is θ. ; and / or, the chord length corresponding to the inner ring arc is d1, , where n is the number of the first bosses (11) in the inner core (1) and R2 is the radius of the base circle of the core.

8. The vibration-damping motor rotor according to claim 7, characterized in that, Projected along the axial direction of the inner core (1), the chord length corresponding to the outer ring arc is d4, and the radial height of the first boss (11) is d2. , ； Where R1 is the radius corresponding to the outer ring arc; and / or, The radial width of the second through hole (13) is d5. .

9. The vibration-damping motor rotor according to claim 1, characterized in that, The inner core (1) includes a first core segment (101), a second core segment (102) and a third core segment (103) stacked sequentially along its axial direction. The first boss (11) is constructed on the outer circumferential wall of the first core segment (101) and the second core segment (102). The axial limiting groove (12) is located on the second core segment (102). The first core segment (101) and the third core segment (103) are formed by stacking multiple first laminations, and the second core segment (102) is formed by stacking multiple second laminations.

10. An electric motor, characterized in that, The rotor of the shock-absorbing motor includes any one of claims 1 to 9.

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

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