Rotor assembly and motor

Abstract

The invention provides a rotor assembly and a motor, the rotor assembly comprises an iron core part, the iron core part comprises a plurality of sub-iron cores and a plurality of magnetic shoes, the sub-iron cores and the magnetic shoes are alternately arranged to form the annular iron core part, the adjacent magnetic shoes and sub-iron cores are attached together, and the magnetic shoes and the sub-iron cores are arranged from the radial center to the radial outer edge. The distance between every two adjacent sub-iron cores is increased and then decreased, and the distance between every two adjacent magnetic shoes is decreased and then increased; or, the distance between every two adjacent sub-iron cores becomes smaller and then becomes larger, and the distance between every two adjacent magnetic shoes becomes larger and then becomes smaller, so that the technical problem of low structural strength of the spliced rotor in the prior art can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a rotor assembly and a motor. Background Art

[0002] With the upgrade of energy efficiency in the home appliance industry, the use of permanent magnet motors in the home appliance industry has increased significantly. The stator of the permanent magnet motor is a wound stator, and the rotor is a permanent magnet rotor. The permanent magnet rotor has a rotor core and a magnetic tile injection molding, wherein the rotor core is formed by punching multiple rotor stampings by a die and stacking them. In order to improve the power density of the permanent magnet motor, an embedded magnetic tile rotor is used to increase the amount of rotor magnetic material and thus increase the motor magnetic flux, for example, the magnetic tile is radially inserted into the radial slot of the rotor core. After the embedded rotor magnetic tile design, there are more magnetic tile grooves on the rotor stamping. The more magnetic tiles are used, the larger the magnetic tile grooves are. The magnetic tile grooves are waste for the rotor stamping, which results in a very low material utilization rate for the embedded rotor stamping.

[0003] In order to improve the material utilization rate of embedded rotor punchings, the industry has begun to gradually split the rotor core into smaller identical cores. After splitting into smaller cores, the high punching arrangement improves the material utilization rate of the punchings, but after the rotor is split into pieces, the strength of the rotor is reduced. When the rotor runs at high speed, it is easy to crack due to the large centrifugal force.

[0004] How to improve the structural strength of spliced ​​rotors is a technical problem that urgently needs to be solved. Summary of the invention

[0005] The present invention provides a rotor assembly and a motor, which can solve the technical problem of low structural strength of a spliced ​​rotor in the prior art.

[0006] First, the present invention provides a rotor assembly, including an iron core portion, wherein the iron core portion includes a plurality of sub-iron cores and a plurality of magnetic tiles, wherein the sub-iron cores and the magnetic tiles are alternately arranged to form a ring-shaped iron core portion, and adjacent magnetic tiles are fitted together with the sub-iron cores. From the radial center to the radial outer edge, the distance between two adjacent sub-iron cores first increases and then decreases, and the distance between two adjacent magnetic tiles first decreases and then increases; or, the distance between two adjacent sub-iron cores first decreases and then increases, and the distance between two adjacent magnetic tiles first increases and then decreases.

[0007] In some embodiments, in the circumferential direction, both sides of the sub-core facing each other are first concave arc surfaces, and both sides of the magnetic tile facing each other are first convex arc surfaces;

[0008] or,

[0009] Both sides of the sub-iron core facing away from each other are second convex arc surfaces, and both sides of the magnetic tile facing away from each other are second concave arc surfaces.

[0010] In some embodiments, the two ends of the magnetic tile in the radial direction are respectively an outer end and an inner end. When the two opposite sides of the magnetic tile are first convex arc surfaces, the outer end and the inner end of the magnetic tile have the same size in the circumferential direction.

[0011] In some embodiments, the sub-core is provided with a first injection hole penetrating the sub-core in the axial direction.

[0012] In some embodiments, at least one end surface of the sub-core in the axial direction is provided with a non-circular positioning hole.

[0013] In some embodiments, a first protrusion is provided at one end of the sub-core facing radially inward, and a first gap is formed between two adjacent first protrusions;

[0014] or,

[0015] A first groove is disposed at one end of the sub-core facing the inner side in the radial direction.

[0016] In some embodiments, the end of the sub-core facing radially inward is a connecting end, and a second gap is formed between two adjacent connecting ends.

[0017] In some embodiments, the rotor assembly further includes a first axial hole for passing the rotating shaft, and the space between the core portion and the first axial hole is filled with injection molding material.

[0018] In some embodiments, when a first injection molding hole is provided, injection plastic is provided in the first injection molding hole, both end surfaces of the rotor assembly are provided with plastic, the outer end of the magnetic tile in the radial direction is provided with injection plastic and this part of the injection plastic at least partially covers two sub-cores adjacent to the magnetic tile; the injection plastic is integrally injection molded to form a first squirrel cage structure.

[0019] In some embodiments, an inner core is disposed radially inwardly of the core portion, the inner core is provided with a second axial hole for passing the rotating shaft, and injection molding material is filled between the inner core and the core portion.

[0020] In some embodiments, a second injection hole in the axial direction is provided on the inner core.

[0021] In some embodiments, when a first injection molding hole is provided, injection plastic is provided in the first injection molding hole, injection plastic is provided in the second injection molding hole, injection plastic is provided at both end surfaces of the rotor assembly, injection plastic is provided at the outer end of the magnetic tile in the radial direction, and this part of the injection plastic at least partially covers the two sub-cores adjacent to the magnetic tile; the injection plastic is integrally injection molded to form a second squirrel cage structure.

[0022] In some embodiments, a first axial limiting structure is provided on the inner end surface of the sub-core in the radial direction;

[0023] and / or,

[0024] A second axial limiting structure is arranged on the outer peripheral surface of the inner iron core.

[0025] The present invention also provides a motor, comprising the rotor assembly.

[0026] In the present invention, from the radial center to the radial outer edge, the distance between two adjacent sub-iron cores first increases and then decreases, and the distance between two adjacent magnetic tiles first decreases and then increases; or, the distance between two adjacent sub-iron cores first decreases and then increases, and the distance between two adjacent magnetic tiles first increases and then decreases, and then in the radial direction, the sub-iron cores and the magnetic tiles are mutually locked. When the rotor rotates, the mutual locking between the sub-iron cores and the magnetic tiles improves the firmness of the rotor assembly and the structural strength of the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0028] Figure 1 is a cross-sectional view of a rotor core of an embodiment of the present invention when it is axially cut to a sub-core;

[0029] Figure 2 is a cross-sectional view of the rotor core of the embodiment of the present invention when the rotor core is not axially cut to the sub-core;

[0030] Figure 3 The embodiment of the present invention Figure 2 Schematic diagram after removing the injection plastic inside the core;

[0031] Figure 4 This is an enlarged view of point A in Figure 3 of an embodiment of the present invention;

[0032] Figure 5 is an axial cross-sectional view of a rotor core when an inner core is provided in an embodiment of the present invention;

[0033] Figure 6 is a schematic diagram of a case where a plurality of sub-cores form a ring shape when a sub-core is provided with a first protrusion according to an embodiment of the present invention;

[0034] Figure 7 is a schematic diagram of a single sub-core when a first protrusion is provided in an embodiment of the present invention;

[0035] Figure 8is a schematic diagram of a case where a plurality of sub-cores form a ring shape when a sub-core is provided with a first groove in an embodiment of the present invention;

[0036] Fig. 9 is a schematic diagram of a single sub-core when a first groove is provided in an embodiment of the present invention;

[0037] Fig.10 is a schematic structural diagram of a magnetic tile in the axial direction of an embodiment of the present invention;

[0038] Fig.11 is a schematic diagram of a rotor core and a rotating shaft arranged together in an embodiment of the present invention;

[0039] The accompanying drawings are marked as follows:

[0040] 1. Sub-core; 100. injection molding material; 101. positioning hole; 102. first concave arc surface; 2. magnetic tile; 201. first convex arc surface; 3. rotating shaft; 301. inner core; 401. first injection molding hole; 402. second injection molding hole; 501. first protrusion; 502. first groove; 601. first interval; 602. second interval; 701. large mouth; 702. small mouth; 801. first axial hole; 802. second axial hole; 901. first concave-convex surface; 902. second concave-convex surface. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0043] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0044] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0045] See also Figure 1-11 As shown, the present invention provides a rotor assembly, including an iron core portion, wherein the iron core portion includes a plurality of sub-iron cores 1 and a plurality of magnetic tiles 2, wherein the sub-iron cores 1 and the magnetic tiles 2 are alternately arranged to form the annular iron core portion, and adjacent magnetic tiles 2 are fitted together with the sub-iron cores 1. From the radial center to the radial outer edge, the distance between two adjacent sub-iron cores 1 first increases and then decreases, and the distance between two adjacent magnetic tiles 2 first decreases and then increases; or, the distance between two adjacent sub-iron cores 1 first decreases and then increases, and the distance between two adjacent magnetic tiles 2 first increases and then decreases.

[0046] In the present application, “radial direction” refers to the radial direction of the rotor assembly, “circumferential direction” refers to the circumferential direction of the rotor assembly, and “axial direction” refers to the axial direction of the rotor assembly.

[0047] Through the above-mentioned arrangement, the present application enables two adjacent sub-cores 1 to lock the magnetic tiles 2 between the two sub-cores 1 in the radial direction, and similarly, two adjacent magnetic tiles 2 to lock the sub-core 1 between the two magnetic tiles 2; that is, all sub-cores 1 and all magnetic tiles 2 form a self-locking structure, so that all sub-cores 1 and the magnetic tiles 2 cannot move in the radial direction. In this way, on the one hand, the sub-cores 1 and the magnetic tiles 2 are more stable when moved after being spliced ​​together; on the other hand, when rotating after injection molding, under the action of centrifugal force, the sub-cores 1 and the magnetic tiles 2 have a tendency to move outward in the radial direction. Due to the above-mentioned self-locking structure, the sub-cores 1 and the magnetic tiles 2 are locked with each other, and in the radial direction, the structure of the core part is more solid and stable, and thus the structural strength and quality of the rotor assembly are also higher.

[0048] The rotor assembly of the present application includes a plurality of sub-cores 1. When the sub-cores 1 are produced, less waste is produced, thereby improving the material utilization rate of the core punching sheets.

[0049] Preferably, Figure 6-Figure 10 As shown, in the circumferential direction, both opposite sides of the sub-core 1 are first concave arc surfaces 102, and both opposite sides of the magnetic tile 2 are first convex arc surfaces 201;

[0050] or,

[0051] The two opposite sides of the sub-iron core 1 are both second convex arc surfaces, and the two opposite sides of the magnetic tile 2 are both second concave arc surfaces.

[0052] The two opposite sides of the sub-core 1 are both first concave arc surfaces 102, and the two opposite sides of the magnetic tile 2 are both first convex arc surfaces 201; in this way, the sub-core 1 and the magnetic tile 2 fit more closely, which improves the firmness of the rotor assembly and makes the self-locking of the rotor assembly more firm; the contact surface between the sub-core 1 and the magnetic tile 2 is an arc surface, which is beneficial to reduce magnetic resistance; because the two adjacent sub-cores 1 do not contact at both ends in the radial direction, it is beneficial to reduce leakage magnetic flux, improve magnetic field utilization, and improve motor power density. The self-locking formed by the above-mentioned structural method can be called "◎" self-locking, and "◎" self-locking refers to a circular self-locking formed by a component covering another component in a reciprocating manner.

[0053] The two opposite sides of the sub-iron core 1 are both second convex arc surfaces, and the two opposite sides of the magnetic tile 2 are both second concave arc surfaces; this is beneficial to increase the usage of the magnetic tile 2.

[0054] Preferably, Figure 7 and Fig.10 As shown, the two ends of the magnetic tile 2 in the radial direction are respectively an outer end and an inner end. When the two opposite sides of the magnetic tile 2 are the first convex arc surface 201, the outer end and the inner end of the magnetic tile 2 have the same size in the circumferential direction.

[0055] By making the two ends of the magnetic tile 2 the same size, on the one hand, it is convenient for the production and installation of the magnetic tile 2; on the other hand, in the axial direction, the shape of the magnetic tile 2 is shuttle-shaped, and the magnetic flux lines formed by the magnetic tile 2 are more uniform in the sub-core 1.

[0056] Specifically, Figure 7 and Fig.10 As shown, X1<Y1, X1<Z1, X2>Y2, X2>Z2, Y2=Z2.

[0057] Preferably, Figure 7 As shown, the sub-core 1 is provided with a first injection hole 401 penetrating the sub-core 1 in the axial direction.

[0058] The first injection hole 401 is provided on the sub-core 1, which is beneficial to improve the stability of the core after injection molding. Further, the first injection hole 401 is provided on the symmetry line of the sub-core 1 in the circumferential direction.

[0059] Preferably, Figure 1 and Figure 7 As shown, at least one end face of the sub-core 1 in the axial direction is provided with a non-circular positioning hole 101 .

[0060] The setting of the positioning hole 101 facilitates the assembly of the sub-core 1 and the magnetic tile 2. It is only necessary to set the sub-core 1 on the positioning block, so that all the sub-cores 1 form a ring, and then insert the magnetic tile 2 between two adjacent sub-cores 1. It is very quick and accurate. Further, the positioning hole 101 is rectangular, which is easy to process. The positioning hole 101 is set on the symmetry line of the sub-core 1 in the circumferential direction. The positioning hole 101 can pass through the sub-core 1.

[0061] Preferably, Figure 6-Figure 9 As shown, a first protrusion 501 is provided at one end of the sub-core 1 facing the radial inner side, and a first gap 601 is formed between two adjacent first protrusions 501;

[0062] or,

[0063] A first groove 502 is provided at one end of the sub-core 1 facing the radial inner side.

[0064] A first protrusion 501 is provided at one end of the sub-core 1 facing radially inward, and a first gap 601 is formed between two adjacent first protrusions 501; or, a first groove 502 is provided at one end of the sub-core 1 facing radially inward. By setting the first gap 601 or the first groove 502, when injection molding is performed, the injection plastic 100 enters the first gap 601 or the first groove 502, thereby limiting the injection plastic 100 and the core part in the circumferential direction, preventing the core part from rotating relative to the injection plastic 100, thereby improving the firmness of the connection between the injection plastic 100 and the core part.

[0065] Preferably, Figure 4 As shown, the end of the sub-core 1 facing radially inward is a connection end, and a second interval 602 is formed between two adjacent connection ends.

[0066] The injection plastic 100 enters between two adjacent sub-cores 1, making the connection between the injection plastic 100 and the core part more secure in the circumferential direction. A second gap 602 is formed between two adjacent connecting ends, that is, the length of the magnetic tile 2 in the radial direction is smaller than the length of the sub-core 1 in the radial direction, and the magnetic tile 2 is not flush with the sub-core 1 on the radial inner side, so that a second gap 602 is formed between the connecting ends of the two adjacent sub-cores 1.

[0067] When the distance between two adjacent sub-cores 1 from the inside to the outside in the radial direction first increases and then decreases, the end of the second interval 602 close to the center of the core portion is a small opening 702, and the end away from the center of the core portion is a large opening 701. After the injection plastic 100 enters the second interval 602, a clamping structure is formed between the injection plastic 100 and the second interval 602 in the radial direction, and the injection plastic 100 forms a radial limit for the sub-cores 1, thereby improving the stability of the rotor assembly during rotation and helping to prevent the sub-cores 1 from moving outward under the action of centrifugal force.

[0068] Preferably, Figure 2 As shown, the rotor assembly further includes a first shaft hole 801 for passing the rotating shaft 3 , and the space between the core portion and the first shaft hole 801 is filled with injection molding material 100 .

[0069] By filling the injection plastic 100 between the first shaft hole 801 and the iron core part, the iron core part and the rotating shaft 3 are conveniently fixed together. There are two ways to form the first shaft hole 801. In the first way, the rotating shaft 3 is first inserted into the iron core part and coaxial with the magnet part, and then injection molding is performed. After the rotating shaft 3 is pulled out, the first shaft hole 801 is formed. In this case, the rotating shaft 3 is generally not pulled out again. In order to prevent the rotating shaft 3 and the injection plastic 100 from rotating relative to each other in the circumferential direction, a rotation-stop groove can be provided on the rotating shaft 3. The injection plastic 100 enters the rotation-stop groove to improve the connection between the injection plastic 100 and the rotating shaft 3. The second method is to use a mold. The diameter of the mold is slightly smaller than the diameter of the shaft 3. The mold is set inside the core and coaxial with the core. The injection plastic 100 is poured. After the injection plastic 100 solidifies, the mold is pulled out and then the shaft 3 is inserted. The shaft 3 and the injection plastic 100 have an interference fit. This method facilitates the replacement of the shaft 3. Similarly, to prevent the injection plastic 100 from rotating relative to the shaft 3, a stop key can be set on the shaft 3, and a keyway is machined in the shaft hole. When the shaft 3 is inserted, the stop key is inserted into the keyway accordingly.

[0070] Preferably, Figure 6 , Figure 7 and Fig.11 As shown, when a first injection hole 401 is provided, an injection plastic 100 is provided in the first injection hole 401, both end faces of the rotor assembly are provided with plastic, the outer end of the magnetic tile 2 in the radial direction is provided with the injection plastic 100 and this part of the injection plastic 100 at least partially covers the two sub-cores 1 adjacent to the magnetic tile 2; the injection plastic 100 is integrally injection-molded to form a first squirrel cage structure.

[0071] The squirrel cage structure is formed by the injection molding material 100, thereby improving the overall firmness of the rotor assembly, facilitating high-speed operation of the rotor assembly, and further improving the performance of the motor.

[0072] The “part of the injection plastic 100 ” in “the part of the injection plastic 100 at least covers a part of the two sub-cores 1 adjacent to the magnetic tile 2 ” refers to the injection plastic 100 disposed at the outer end of the magnetic tile 2 in the radial direction.

[0073] Preferably, Figure 5 and Fig.11 As shown, an inner core 301 is arranged radially inside the core portion, and the inner core 301 is provided with a second axial hole 802 for passing the rotating shaft 3 , and the space between the inner core 301 and the core portion is filled with injection molding material 100 .

[0074] By providing the inner iron core 301, the rotating shaft 3 is inserted into the second shaft hole 802 on the inner iron core 301 to form a rotor assembly with the iron core part, thereby improving the firmness of the connection between the rotating shaft 3 and the magnet part, facilitating the production and sale of the rotor assembly as a minimum unit, and improving the applicability of the rotor assembly.

[0075] Preferably, Figure 5 As shown, the inner core 301 is provided with a second injection hole 402 in the axial direction.

[0076] The inner core 301 is provided with a second injection hole 402, through which injection molding can be performed. During the injection molding process, air can also flow out from the second injection hole 402, thereby improving the smoothness of the injection molding process and avoiding the phenomenon that the injection material 100 does not flow long enough to cause insufficient covering of the core part.

[0077] Preferably, Figure 5 , Figure 7 and Fig.11 As shown, when a first injection molding hole 401 is provided, an injection plastic 100 is provided in the first injection molding hole 401, and an injection plastic 100 is provided in the second injection molding hole 402. Both end surfaces of the rotor assembly are provided with injection plastic 100, and the outer end of the magnetic tile 2 in the radial direction is provided with injection plastic 100, and this part of the injection plastic 100 at least partially covers the two sub-cores 1 adjacent to the magnetic tile 2; the injection plastic 100 is integrally injection-molded to form a second squirrel cage structure.

[0078] By forming the injection molding material 100 into the second squirrel cage structure, the structural strength of the rotor assembly is improved.

[0079] The “part of the injection plastic 100 ” in “the part of the injection plastic 100 at least covers a part of the two sub-cores 1 adjacent to the magnetic tile 2 ” refers to the injection plastic 100 disposed at the outer end of the magnetic tile 2 in the radial direction.

[0080] Preferably, Fig.11 As shown, the sub-core 1 is provided with a first axial limiting structure on the inner end surface in the radial direction;

[0081] and / or,

[0082] A second axial limiting structure is provided on the outer circumferential surface of the inner iron core 301 .

[0083] By setting a first axial limiting structure on the inner side surface of the sub-core 1 and a second axial limiting structure on the inner core 301, after injection molding, an axial limit is formed between the injection material 100 and the inner core 301, and an axial limit is formed between the injection material 100 and the sub-core 1. In this way, axial relative movement between the sub-core 1 and the injection material 100, and between the injection material 100 and the inner core 301 is prevented, thereby improving the firmness and structural strength of the rotor assembly.

[0084] Furthermore, the first axial limiting structure is a first concave-convex surface 901 , which is annular, and the second axial limiting structure is a second concave-convex surface 902 , which is annular.

[0085] The present invention also provides a motor, comprising the rotor assembly mentioned above.

[0086] When the motor provided with the rotor assembly is running at high speed, the rotor assembly is more solid and runs more stably. Due to the self-locking structure formed between the sub-iron core 1 and the magnetic tile 2, the motor can rotate at a higher speed, and the rotor will not loosen or crack due to the high speed. The injection molding material 100 is a polymer material.

[0087] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0088] The above description is only 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 principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A rotor assembly, comprising an iron core portion, wherein the iron core portion comprises a plurality of sub-iron cores (1) and a plurality of magnetic tiles (2), characterized in that: The sub-iron cores (1) and the magnetic tiles (2) are alternately arranged to form the annular iron core portion, and the adjacent magnetic tiles (2) and the sub-iron cores (1) are fitted together. From the radial center to the radial outer edge, the distance between two adjacent sub-iron cores (1) first increases and then decreases, and the distance between two adjacent magnetic tiles (2) first decreases and then increases; or, the distance between two adjacent sub-iron cores (1) first decreases and then increases, and the distance between two adjacent magnetic tiles (2) first increases and then decreases.

2. The rotor assembly according to claim 1, characterized in that In the circumferential direction, the two opposite sides of the sub-iron core (1) are both first concave arc surfaces (102), and the two opposite sides of the magnetic tile (2) are both first convex arc surfaces (201); or, The two opposite sides of the sub-iron core (1) are both second convex arc surfaces, and the two opposite sides of the magnetic tile (2) are both second concave arc surfaces.

3. The rotor assembly according to claim 2, characterized in that: The two ends of the magnetic tile (2) in the radial direction are respectively an outer end and an inner end. When the two opposite sides of the magnetic tile (2) are first convex arc surfaces (201), the outer end and the inner end of the magnetic tile (2) have the same size in the circumferential direction.

4. The rotor assembly according to claim 1, characterized in that: The sub-core (1) is provided with a first injection hole (401) penetrating the sub-core (1) in the axial direction.

5. The rotor assembly according to claim 1, characterized in that: At least one end surface of the sub-core (1) in the axial direction is provided with a non-circular positioning hole (101).

6. The rotor assembly according to claim 1, characterized in that A first protrusion (501) is provided at one end of the sub-core (1) facing the inner side in the radial direction, and a first gap (601) is formed between two adjacent first protrusions (501); or, A first groove (502) is provided at one end of the sub-core (1) facing the radial inner side.

7. The rotor assembly according to claim 1, characterized in that One end of the sub-core (1) facing radially inward is a connection end, and a second gap (602) is formed between two adjacent connection ends.

8. The rotor assembly according to any one of claims 1 to 7, characterized in that: The rotor assembly further comprises a first shaft hole (801) for passing the rotating shaft (3), and an injection molding material (100) is filled between the iron core portion and the first shaft hole (801).

9. The rotor assembly according to claim 8, characterized in that When a first injection molding hole (401) is provided, an injection molding material (100) is provided in the first injection molding hole (401), both end surfaces of the rotor assembly are provided with plastic, and the outer end of the magnetic tile (2) in the radial direction is provided with an injection molding material (100), and the injection molding material (100) at least partially covers two sub-cores (1) adjacent to the magnetic tile (2); the injection molding material (100) is integrally injection-molded to form a first squirrel cage structure.

10. The rotor assembly according to any one of claims 1 to 7, characterized in that: An inner iron core (301) is arranged radially inside the iron core portion, the inner iron core (301) is provided with a second axial hole (802) for passing the rotating shaft (3), and an injection molding material (100) is filled between the inner iron core (301) and the iron core portion.

11. The rotor assembly according to claim 10, characterized in that The inner iron core (301) is provided with a second injection hole (402) in the axial direction.

12. The rotor assembly according to claim 11, characterized in that When a first injection molding hole (401) is provided, an injection molding material (100) is provided in the first injection molding hole (401), an injection molding material (100) is provided in the second injection molding hole (402), both end surfaces of the rotor assembly are provided with injection molding materials (100), the outer ends of the magnetic tiles (2) in the radial direction are provided with injection molding materials (100), and the injection molding materials (100) at least partially cover two sub-cores (1) adjacent to the magnetic tiles (2); the injection molding materials (100) are integrally injection-molded to form a second squirrel cage structure.

13. The rotor assembly according to claim 10, characterized in that The sub-core (1) is provided with a first axial limiting structure on the inner end surface in the radial direction; and / or, A second axial limiting structure is provided on the outer peripheral surface of the inner iron core (301).

14. A motor, characterized in that: A rotor assembly comprising any one of claims 1-13.

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