Rotor assembly and motor

Abstract

The utility model provides a rotor assembly and a motor. The rotor assembly comprises a rotor iron core, a plurality of magnetic shoes, a first injection molding piece, a positioning assembly and a first connecting piece. The rotor iron core is provided with a first through hole, and the first through hole penetrates through the rotor iron core in the axial direction of the rotor iron core. The plurality of magnetic shoes are distributed along the circumferential direction of the rotor iron cores and are arranged on the side walls of the plurality of rotor iron cores; the first injection molding part is arranged in the first through hole and extends from the first side of the rotor core to the second side of the rotor core; the positioning assembly is arranged on the first side of the rotor iron core and / or the second side of the rotor iron core; the first connecting piece is connected with the positioning assembly and is connected with the first injection molding piece; wherein the first side of the rotor core and the second side of the rotor core are two sides, deviating from each other in the axial direction, of the rotor core. According to the invention, the first injection molding part is arranged, so that the first injection molding part can fix the rotor core formed by stacking the plurality of punching sheets, and the plurality of punching sheets are prevented from moving in the axial direction or the radial direction.

Description

Technical Field

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

[0002] At present, a rotor core is provided in a rotor assembly. The rotor core is formed by stacking a plurality of punching sheets, and magnetic tiles are provided on the rotor core. In the related art, plastic packaging is usually provided on the outside of the rotor core and the magnetic tiles to fix the rotor core and the magnetic tiles. However, when the plastic packaging is provided on the outside of the sub-core and the magnetic tiles, the strength and stiffness of the plastic packaging will decrease under hot operating conditions, thereby causing relative displacement between the plurality of punching sheets of the rotor core. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology.

[0004] To this end, a first aspect of the present invention provides a rotor assembly.

[0005] A second aspect of the present invention provides a motor.

[0006] In view of this, the first aspect of the utility model provides a rotor assembly, including a rotor core, a plurality of magnetic tiles, a first injection molded part, a positioning assembly and a first connecting member. The rotor core is provided with a first through hole, and the first through hole penetrates the rotor core along the axial direction of the rotor core; the plurality of magnetic tiles are distributed along the circumferential direction of the rotor core and are arranged on the side walls of the plurality of rotor cores; the first injection molded part is arranged in the first through hole, extending from the first side of the rotor core to the second side of the rotor core; the positioning assembly is arranged on the first side of the rotor core and / or the second side of the rotor core; the first connecting member is connected to the positioning assembly and to the first injection molded part; wherein the first side of the rotor core and the second side of the rotor core are two sides of the rotor core that are opposite to each other in the axial direction.

[0007] In this technical solution, the rotor assembly includes a rotor core, a plurality of magnetic tiles and a first injection molded part. The rotor core is provided with a first through hole, and the first through hole penetrates the rotor core along the axial direction of the rotor core to realize the arrangement of the first through hole. The plurality of magnetic tiles are distributed along the circumferential direction of the rotor core and are arranged on the side walls of the plurality of rotor cores to realize the installation and fixation of the plurality of magnetic tiles. The rotor assembly can be rotated by arranging the plurality of magnetic tiles. The first injection molded part is arranged in the first through hole, extending from the first side of the rotor core to the second side of the rotor core to realize the arrangement of the first injection molded part. By arranging the first injection molded part from the first side of the rotor core to the second side, the first injection molded part can fix the rotor core. The first side of the rotor core and the second side of the rotor core are two sides of the rotor core that are opposite to each other in the axial direction, so as to facilitate the axial fixation of the rotor core. The positioning assembly is arranged on the first side of the rotor core and / or the second side of the rotor core to realize the installation and fixation of the positioning assembly. The first connector is connected to the positioning assembly and the first injection molded part to achieve installation and fixation of the first connector. The positioning assembly and the first injection molded part are connected together by the first connector, thereby achieving indirect connection between the positioning assembly and the first injection molded part. The indirect connection method is convenient for adjusting the position between the positioning assembly and the first injection molded part. In addition, by setting the first connector, the positioning assembly is prevented from being directly connected to the first injection molded part, thereby reducing the volume and weight of the positioning assembly, thereby reducing the cost of the positioning assembly. The present application sets the first injection molded part so that the first injection molded part can fix the rotor core formed by stacking multiple punching sheets, avoid the multiple punching sheets from moving in the axial or radial direction, and prevent the position of the magnetic tile from moving due to the movement of the rotor core. Therefore, the first injection molded part can not only improve the stability of the rotor core after installation, but also improve the stability of the magnetic tile after installation, and reduce the probability of relative displacement between the magnetic tile and the rotor core.

[0008] In addition, the rotor assembly in the above technical solution provided by the utility model may also have the following additional technical features:

[0009] In some technical solutions of the present invention, optionally, there are multiple first connecting members, and the multiple first connecting members are arranged at intervals along the circumferential direction of the rotor core.

[0010] In this technical solution, there are multiple first connecting members, and the multiple first connecting members are arranged at intervals along the circumference of the rotor core to realize the arrangement of the multiple first connecting members. By setting up multiple first connecting members, the positioning assembly and the first injection molded part can be connected together at multiple positions to improve the stability of the connection between the positioning assembly and the first injection molded part.

[0011] In some technical solutions of the present utility model, optionally, the first connecting members are arranged in a ring shape along the circumference of the rotor core.

[0012] In this technical solution, the first connecting member is arranged in a ring shape along the circumference of the rotor core. The first connecting member is arranged in a ring shape so that it is continuously arranged along the circumference of the rotor core, thereby improving the stability of the connection between the positioning assembly and the first injection molded part.

[0013] In some technical solutions of the utility model, the positioning assembly may optionally include a first positioning member and a second positioning member. The first positioning member is arranged on the first side of the rotor core and connected to the first injection molded part; the second positioning member is arranged on the second side of the rotor core and connected to the first injection molded part.

[0014] In this technical solution, the positioning assembly includes a first positioning member and a second positioning member. The first positioning member is arranged on the first side of the rotor core and is connected to the first injection molded part to realize the installation and fixation of the first positioning member. Since the first positioning member will not move along the axial direction of the rotor core after being fixed, the first positioning member can further limit the axial movement of the rotor core. The second positioning member is arranged on the second side of the rotor core and is connected to the first injection molded part to realize the installation and fixation of the second positioning member. Since the second positioning member will not move along the axial direction of the rotor core after being fixed, the second positioning member can further limit the axial movement of the rotor core. By arranging the first positioning member and the second positioning member, the first positioning member and the second positioning member can clamp the rotor core, further improving the stability of the rotor core after plastic sealing.

[0015] In some technical solutions of the present invention, optionally, the magnetic shoe contacts the first positioning member on a first side of the rotor core in the axial direction; and the magnetic shoe contacts the second positioning member on a second side of the rotor core in the axial direction.

[0016] In this technical solution, the magnetic tile contacts the first positioning member on the first side in the axial direction of the rotor core to achieve installation between the magnetic tile and the first positioning member. The magnetic tile contacts the second positioning member on the second side in the axial direction of the rotor core to achieve installation between the magnetic tile and the second positioning member. Since multiple magnetic tiles are arranged on the side wall of the rotor core, by making the magnetic tiles contact the first positioning member and the second positioning member respectively, the first positioning member and the second positioning member can limit the axial movement of the multiple magnetic tiles, thereby preventing the magnetic tiles from moving along the axial direction of the rotor core when the rotor assembly is running, thereby further improving the stability of the magnetic tiles after installation.

[0017] In some technical solutions of the present invention, optionally, the rotor assembly also includes a second injection-molded part, which is located on the side of the magnetic tile away from the axis of the rotor core, contacts a portion of the side wall of the magnetic tile, and the second injection-molded part is connected to the first positioning part on the first side in the axial direction of the rotor core, and the second injection-molded part is connected to the second positioning part on the second side in the axial direction of the rotor core.

[0018] In this technical solution, the rotor assembly also includes a second injection molded part. The second injection molded part is located on the side of the magnetic tile away from the axis of the rotor core, and contacts part of the side wall of the magnetic tile, that is, the second injection molded part is located on the outside of the magnetic tile, and the second injection molded part is connected to the first positioning member on the first side in the axial direction of the rotor core, and the second injection molded part is connected to the second positioning member on the second side in the axial direction of the rotor core, that is, the second injection molded part is connected to the first positioning member and the second positioning member at both ends in the axial direction of the rotor core, respectively, to achieve the installation and fixation of the second injection molded part, so that the second injection molded part can limit the movement of the magnetic tile in the radial direction of the rotor core, thereby further improving the stability of the magnetic tile after installation.

[0019] In some technical solutions of the present invention, optionally, the first connecting member is in contact with the wall surface of the first side of the rotor core; or the first connecting member is in contact with the wall surface of the second side of the rotor core.

[0020] In this technical solution, the first connecting member is in contact with the wall surface of the first side of the rotor core; or the first connecting member is in contact with the wall surface of the second side of the rotor core to achieve the installation and fixation of the first connecting member, so that the first connecting member can connect the positioning assembly and the first injection molded part.

[0021] In some technical solutions of the present utility model, optionally, the rotor core is provided with a counterweight hole, and the counterweight hole is staggered with the first connecting member.

[0022] In this technical solution, the rotor core is provided with a counterweight hole, and the counterweight hole is staggered with the first connecting member to realize the arrangement of the counterweight hole, so as to adjust the weight distribution of the rotor assembly by adding counterweight material into the counterweight hole, and avoid the unbalanced force generated by the rotor assembly during rotation due to the weight difference of the rotor assembly. Therefore, by setting the counterweight hole, the stability of the rotor assembly during rotation can be improved, and the vibration and noise generated during rotation of the rotor assembly can be reduced. The staggered arrangement of the counterweight hole and the first connecting member can avoid the interference of the first connecting member with the weight reduction hole when the counterweight material is added into the counterweight hole.

[0023] In some technical solutions of the present utility model, optionally, the first injection molded part is provided with a second through hole, and the second through hole penetrates the first injection molded part along the axial direction of the rotor core.

[0024] In this technical solution, the first injection molded part is provided with a second through hole, and the second through hole penetrates the first injection molded part along the axial direction of the rotor core to realize the arrangement of the second through hole. By setting the second through hole in the first injection molded part, the weight of the first injection molded part can be reduced, and then the overall weight of the rotor assembly can be reduced, thereby reducing the production cost of the rotor assembly.

[0025] In some technical solutions of the present utility model, optionally, the wall thickness of the first injection-molded part in the radial direction of the rotor core is greater than or equal to 0.5 mm and less than or equal to 4 mm.

[0026] In this technical solution, the wall thickness of the first injection molded part in the radial direction of the rotor core is greater than or equal to 0.5 mm and less than or equal to 4 mm, so as to achieve adjustment of the wall thickness of the first injection molded part in the radial direction of the rotor core. By setting the wall thickness of the first injection molded part in the radial direction of the rotor core to 0.5 mm to 4 mm, the weight of the first injection molded part can be further reduced while ensuring the connection strength of the first injection molded part, thereby reducing the production cost of the rotor assembly.

[0027] In some technical solutions of the present utility model, optionally, there are multiple first through holes, the rotor core is provided with an axial hole, and the first through holes are arranged around the axial hole.

[0028] In this technical solution, there are multiple first through holes, and the rotor core is provided with an axial hole. The first through holes are arranged around the axial hole to realize the arrangement of the first through holes and the axial hole. By arranging multiple first through holes around the axial hole, multiple first injection-molded parts can be arranged around the axial hole, so that the distribution of multiple first injection-molded parts is more uniform, so that multiple injection-molded parts can fix the rotor core at multiple positions, thereby improving the stability of the rotor core after installation.

[0029] In some technical solutions of the present utility model, optionally, the rotor core is provided with a plurality of weight-reducing holes, and the plurality of weight-reducing holes are arranged around the shaft hole.

[0030] In this technical solution, the rotor core is provided with a plurality of weight-reducing holes, and the plurality of weight-reducing holes are arranged around the shaft hole. The arrangement of the plurality of weight-reducing holes can reduce the weight of the rotor core, so as to achieve lightweighting of the rotor assembly. Moreover, the arrangement of the plurality of weight-reducing holes around the shaft hole can also improve the stability of the rotor assembly during rotation.

[0031] In some technical solutions of the present utility model, optionally, a plurality of weight-reducing holes and a plurality of first through holes are arranged alternately.

[0032] In this technical solution, multiple weight-reducing holes and multiple first through holes are arranged alternately to realize the arrangement of multiple weight-reducing holes and multiple first through holes, so that the multiple weight-reducing holes and the multiple first through holes are independent of each other, avoiding interference between the multiple weight-reducing holes and the multiple first through holes, thereby reducing the weight of the rotor core and improving the stability of the rotor core after installation.

[0033] In some technical solutions of the utility model, optionally, multiple first through holes are arranged along the outer periphery of the multiple weight-reducing holes; in the radial direction of the rotor core, the multiple first through holes are opposite to the multiple weight-reducing holes, or the multiple first through holes are opposite to the gaps between the multiple weight-reducing holes.

[0034] In this technical solution, multiple first through holes are arranged along the outer periphery of multiple weight-reducing holes, so as to realize the arrangement of multiple weight-reducing holes and multiple first through holes. In the radial direction of the rotor core, multiple first through holes are opposite to multiple weight-reducing holes, or multiple first through holes are opposite to the gaps between multiple weight-reducing holes, that is, multiple first through holes and multiple weight-reducing holes are arranged in the same direction or staggered in the radial direction, which reduces the weight of the rotor core and improves the stability of the rotor core after installation.

[0035] In some technical solutions of the present invention, optionally, the first through hole is opposite to the gap between two adjacent magnetic tiles among the multiple magnetic tiles; or the first through hole is opposite to the center line of the magnetic tile in the circumferential direction of the rotor core.

[0036] In this technical solution, the first through hole is opposite to the gap between two adjacent magnetic tiles among the multiple magnetic tiles, or the first through hole is opposite to the center line of the magnetic tile in the circumferential direction of the rotor core, so as to realize the arrangement of the first through hole, so that the first injection-molded part can be opposite to the gap between two adjacent magnetic tiles among the multiple magnetic tiles, and the first through hole is opposite to the center line of the magnetic tile in the circumferential direction of the rotor core, so that the first injection-molded part can have different arrangements, so that the first injection-molded part can fix the rotor core under different arrangements.

[0037] The second aspect of the utility model provides a motor, comprising a rotor assembly in any of the above technical solutions. Therefore, the motor has all the beneficial effects of the rotor assembly, which will not be described in detail here.

[0038] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0040] Figure 1 One of the schematic diagrams of a rotor assembly according to an embodiment of the utility model is shown;

[0041] Figure 2 A schematic structural diagram showing a rotor assembly provided with a counterweight hole according to an embodiment of the utility model is shown;

[0042] Figure 3 A schematic diagram showing a rotor core provided with a counterweight hole according to an embodiment of the utility model is shown;

[0043] Figure 4One of the structural schematic diagrams of the first injection molded part and the second injection molded part according to an embodiment of the utility model is shown;

[0044] Figure 5 A second structural schematic diagram of a first injection molded part and a second injection molded part according to an embodiment of the utility model is shown;

[0045] Figure 6 A second schematic diagram of a rotor assembly according to an embodiment of the utility model is shown;

[0046] Figure 7 A third structural schematic diagram of a first injection molded part and a second injection molded part according to an embodiment of the utility model is shown;

[0047] Figure 8 A schematic structural diagram showing a rotor assembly according to an embodiment of the utility model without a counterweight hole is shown;

[0048] Fig. 9 A third schematic diagram of a rotor assembly according to an embodiment of the present utility model is shown;

[0049] Fig.10 A schematic structural diagram showing a rotor core without a counterweight hole according to an embodiment of the utility model is shown;

[0050] Fig.11 One of the schematic diagrams of a weight-reducing hole according to an embodiment of the utility model is shown;

[0051] Fig.12 A fourth structural schematic diagram of a first injection molded part and a second injection molded part according to an embodiment of the utility model is shown;

[0052] Fig.13 One of the structural schematic diagrams showing a rotor assembly provided with weight-reducing holes according to an embodiment of the utility model is shown;

[0053] Fig.14 A fifth structural schematic diagram of a first injection molded part and a second injection molded part according to an embodiment of the utility model is shown;

[0054] Fig.15 A fourth schematic diagram of a rotor assembly according to an embodiment of the present utility model is shown;

[0055] Fig.16 A sixth structural schematic diagram of a first injection molded part and a second injection molded part according to an embodiment of the utility model is shown;

[0056] Fig.17 A second schematic diagram of a weight-reducing hole according to an embodiment of the utility model is shown;

[0057] Fig.18 A seventh structural schematic diagram of a first injection molded part and a second injection molded part according to an embodiment of the utility model is shown;

[0058] Fig.19 A second structural schematic diagram showing a rotor assembly provided with weight-reducing holes according to an embodiment of the utility model;

[0059] Fig. 20 An eighth structural schematic diagram of a first injection molded part and a second injection molded part according to an embodiment of the utility model is shown;

[0060] Fig.21 A fifth schematic diagram of a rotor assembly according to an embodiment of the present utility model is shown;

[0061] Fig. 22 A ninth structural schematic diagram of a first injection molded part and a second injection molded part according to an embodiment of the utility model is shown;

[0062] Fig.23 A schematic block diagram of a motor according to an embodiment of the utility model is shown.

[0063] in, Figures 1 to 23 The corresponding relationship between the reference numerals and component names in the figure is:

[0064] 100 rotor assembly, 110 rotor core, 112 first through hole, 114 counterweight hole, 116 shaft hole, 118 weight reduction hole, 120 magnetic tile, 122 gap, 130 first injection molded part, 132 second through hole, 140 first positioning part, 150 second positioning part, 160 first connecting part, 170 second injection molded part, 180 positioning assembly, 200 motor. DETAILED DESCRIPTION

[0065] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0066] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0067] Refer to the following Figures 1 to 23 A rotor assembly 100 and a motor 200 according to some embodiments of the present invention are described.

[0068] like Figure 1 and Figure 2As shown, Figure 1 One of the schematic diagrams of a rotor assembly 100 according to an embodiment of the present utility model is shown; Figure 2 The structure schematic diagram of the rotor assembly 100 according to an embodiment of the utility model is provided with a counterweight hole 114; this embodiment provides a rotor assembly 100, including a rotor core 110, a plurality of magnetic tiles 120, a first injection molded part 130, a positioning assembly 180 and a first connecting member 160. Figure 3 As shown, Figure 3 A schematic diagram is shown in which a rotor core 110 is provided with a counterweight hole 114 according to an embodiment of the utility model; the rotor core 110 is provided with a first through hole 112, and the first through hole 112 penetrates the rotor core 110 along the axial direction of the rotor core 110; a plurality of magnetic tiles 120 are distributed along the circumferential direction of the rotor core 110 and are arranged on the side walls of the plurality of rotor cores 110; a first injection molded part 130 is arranged in the first through hole 112, extending from the first side of the rotor core 110 to the second side of the rotor core 110; a positioning assembly 180 is arranged on the first side of the rotor core 110 and / or the second side of the rotor core 110; a first connecting member 160 is connected to the positioning assembly 180 and is connected to the first injection molded part 130; wherein, the first side of the rotor core 110 and the second side of the rotor core 110 are two sides of the rotor core 110 that are opposite to each other in the axial direction.

[0069] In this embodiment, the rotor assembly 100 includes a rotor core 110, a plurality of magnetic tiles 120, and a first injection molded part 130. The rotor core 110 is provided with a first through hole 112, and the first through hole 112 penetrates the rotor core 110 along the axial direction of the rotor core 110 to achieve the arrangement of the first through hole 112. The plurality of magnetic tiles 120 are distributed along the circumferential direction of the rotor core 110 and are arranged on the side walls of the plurality of rotor cores 110 to achieve the installation and fixation of the plurality of magnetic tiles 120. By arranging the plurality of magnetic tiles 120, the rotor assembly 100 can be rotated. The first injection molded part 130 is disposed in the first through hole 112, extending from the first side of the rotor core 110 to the second side of the rotor core 110, so as to realize the arrangement of the first injection molded part 130. By arranging the first injection molded part 130 from the first side to the second side of the rotor core 110, the first injection molded part 130 can fix the rotor core 110. The first side of the rotor core 110 and the second side of the rotor core 110 are two sides of the rotor core 110 that are axially opposite to each other, so as to facilitate the axial fixing of the rotor core 110. The positioning assembly 180 is disposed on the first side of the rotor core 110 and / or the second side of the rotor core 110, so as to realize the installation and fixing of the positioning assembly 180. The first connecting member 160 is connected to the positioning assembly 180 and to the first injection molded part 130 to achieve the installation and fixation of the first connecting member 160. The positioning assembly 180 and the first injection molded part 130 are connected together by utilizing the first connecting member 160, thereby achieving an indirect connection between the positioning assembly 180 and the first injection molded part 130. The indirect connection method facilitates the adjustment of the position between the positioning assembly 180 and the first injection molded part 130. In addition, by setting the first connecting member 160, the positioning assembly 180 is avoided from being directly connected to the first injection molded part 130, thereby reducing the volume and weight of the positioning assembly 180, thereby reducing the cost of the positioning assembly 180. The present application sets a first injection molded part 130 so that the first injection molded part 130 can fix the rotor core 110 formed by stacking multiple punching sheets, avoid axial or radial movement of the multiple punching sheets, and prevent the position of the magnetic tile 120 from moving due to the movement of the rotor core 110. Therefore, the first injection molded part 130 can not only improve the stability of the rotor core 110 after installation, but also improve the stability of the magnetic tile 120 after installation, and reduce the probability of relative displacement between the magnetic tile 120 and the rotor core 110.

[0070] Specifically, the present application arranges the first injection molded part 130 in the first through hole 112, extending from the first side of the rotor core 110 to the second side of the rotor core 110, that is, the first injection molded part 130 passes through the axial direction of the rotor core 110, thereby ensuring the effective combination between the rotor core 110 and the first injection molded part 130, and then effectively connecting the magnetic tile 120 and the rotor core 110, so that the punching sheets of the rotor core 110 can be prevented from moving relative to each other when the motor 200 is in a hot state, thereby preventing the magnetic tile 120 and the rotor core 110 from being separated in the radial and circumferential directions due to the centrifugal force of rotation; and also preventing the magnetic tile 120 and the rotor core 110 from having a large relative displacement in the axial direction due to falling. Specifically, the first injection molded part 130 is a plastic package.

[0071] Specifically, in Figure 3 , arrow A indicates the axial direction of the rotor core 110 , arrow B indicates the circumferential direction of the rotor core 110 , and arrow C indicates the radial direction of the rotor core 110 .

[0072] Specifically, the positioning assembly 180 is disposed on a first side of the rotor core 110 .

[0073] Specifically, the positioning assembly 180 is disposed on the second side of the rotor core 110 .

[0074] Specifically, the positioning assembly 180 is disposed on a first side of the rotor core 110 and a second side of the rotor core 110 .

[0075] This embodiment provides a rotor assembly 100. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0076] like Fig.12 and Fig.15 As shown, there are multiple first connection members 160 , and the multiple first connection members 160 are arranged at intervals along the circumferential direction of the rotor core 110 .

[0077] In this embodiment, there are multiple first connecting members 160, and the multiple first connecting members 160 are arranged at intervals along the circumference of the rotor core 110 to realize the arrangement of the multiple first connecting members 160. By setting up multiple first connecting members 160, the positioning assembly 180 can be connected to the first injection molded part 130 at multiple positions to improve the stability of the connection between the positioning assembly 180 and the first injection molded part 130.

[0078] This embodiment provides a rotor assembly 100. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0079] like Figure 2 and Fig. 9As shown, the first connecting members 160 are arranged in a ring shape along the circumference of the rotor core 110 .

[0080] In this embodiment, the first connecting member 160 is arranged in a ring shape along the circumference of the rotor core 110. The first connecting member 160 is arranged in a ring shape so that it is continuously arranged along the circumference of the rotor core 110, thereby improving the stability of the connection between the positioning assembly 180 and the first injection molded part 130.

[0081] like Figure 4 , Figure 5 and Figure 6 As shown, Figure 4 One of the structural schematic diagrams of the first injection molded part 130 and the second injection molded part 170 according to an embodiment of the utility model is shown; Figure 5 The second structural schematic diagram of the first injection molded part 130 and the second injection molded part 170 according to an embodiment of the present utility model is shown; Figure 6 The second schematic diagram of the rotor assembly 100 according to an embodiment of the present utility model is shown; the positioning assembly 180 includes a first positioning member 140 and a second positioning member 150. The first positioning member 140 is arranged on the first side of the rotor core 110 and connected to the first injection molded part 130; the second positioning member 150 is arranged on the second side of the rotor core 110 and connected to the first injection molded part 130.

[0082] In this embodiment, the positioning assembly 180 includes a first positioning member 140 and a second positioning member 150. The first positioning member 140 is disposed on the first side of the rotor core 110 and is connected to the first injection molded part 130 to achieve installation and fixation of the first positioning member 140. Since the first positioning member 140 will not move along the axial direction of the rotor core 110 after being fixed, the first positioning member 140 can further limit the axial movement of the rotor core 110. The second positioning member 150 is disposed on the second side of the rotor core 110 and is connected to the first injection molded part 130 to achieve installation and fixation of the second positioning member 150. Since the second positioning member 150 will not move along the axial direction of the rotor core 110 after being fixed, the second positioning member 150 can further limit the axial movement of the rotor core 110. By providing the first positioning member 140 and the second positioning member 150 , the first positioning member 140 and the second positioning member 150 can clamp the rotor core 110 , thereby further improving the stability of the rotor core 110 after plastic packaging.

[0083] This embodiment provides a rotor assembly 100. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0084] like Figure 6As shown, the magnetic tile 120 contacts the first positioning member 140 on a first side in the axial direction of the rotor core 110 ; and the magnetic tile 120 contacts the second positioning member 150 on a second side in the axial direction of the rotor core 110 .

[0085] In this embodiment, the magnetic tile 120 contacts the first positioning member 140 on the first side in the axial direction of the rotor core 110 to achieve installation between the magnetic tile 120 and the first positioning member 140. The magnetic tile 120 contacts the second positioning member 150 on the second side in the axial direction of the rotor core 110 to achieve installation between the magnetic tile 120 and the second positioning member 150. Since a plurality of magnetic tiles 120 are arranged on the side wall of the rotor core 110, by making the magnetic tiles 120 contact the first positioning member 140 and the second positioning member 150 respectively, the first positioning member 140 and the second positioning member 150 can limit the axial movement of the plurality of magnetic tiles 120, thereby preventing the magnetic tiles 120 from moving along the axial direction of the rotor core 110 when the rotor assembly 100 is in operation, thereby further improving the stability of the magnetic tiles 120 after installation.

[0086] This embodiment provides a rotor assembly 100. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0087] like Figure 4 and Figure 7 As shown, Figure 7 The third structural schematic diagram of the first injection molded part 130 and the second injection molded part 170 according to an embodiment of the utility model is shown; the rotor assembly 100 also includes the second injection molded part 170, the second injection molded part 170 is located on the side of the magnetic tile 120 away from the axis of the rotor core 110, and contacts with part of the side wall of the magnetic tile 120, the second injection molded part 170 is connected to the first positioning member 140 on the first side in the axial direction of the rotor core 110, and the second injection molded part 170 is connected to the second positioning member 150 on the second side in the axial direction of the rotor core 110.

[0088] In this embodiment, the rotor assembly 100 further includes a second injection molded part 170. The second injection molded part 170 is located on the side of the magnetic tile 120 away from the axis of the rotor core 110, and contacts a part of the side wall of the magnetic tile 120, that is, the second injection molded part 170 is located on the outside of the magnetic tile 120, and the second injection molded part 170 is connected to the first positioning member 140 on the first side in the axial direction of the rotor core 110, and the second injection molded part 170 is connected to the second positioning member 150 on the second side in the axial direction of the rotor core 110, that is, the second injection molded part 170 is connected to the first positioning member 140 and the second positioning member 150 at both ends in the axial direction of the rotor core 110, respectively, to achieve the installation and fixation of the second injection molded part 170, so that the second injection molded part 170 can limit the movement of the magnetic tile 120 in the radial direction of the rotor core 110, thereby further improving the stability of the magnetic tile 120 after installation.

[0089] Specifically, by arranging the second injection molded part 170 through the first positioning member 140 and the second positioning member 150 and the first injection molded part 130, a stronger effective connection is formed between the magnetic tile 120 and the rotor core 110, thereby reducing the risk of separation between the magnetic tile 120 and the rotor core 110 when the rotor assembly 100 is running.

[0090] Specifically, the rotor assembly 100 is a rotor with an SPM (Surface Permanent Magnet) structure. By arranging the magnetic tiles 120 on the outer wall of the rotor core 110, there is no need to glue the magnetic tiles 120 and the rotor core 110. The second injection molded part 170 is injection molded with a high-strength plastic material. Multiple magnetic tiles 120 are evenly distributed along the circumference of the core. Then, the magnetic tiles 120 and the rotor core 110 are injection molded as inserts. The plastic material is evenly coated on the magnetic tiles 120, thereby realizing the combination between the rotor core 110 and the magnetic tiles 120. This molding method is efficient and the strength of the rotor assembly 100 is better.

[0091] Specifically, the first injection molded part 130, the first positioning part 140, and the second injection molded part 170 are an integrated injection molding structure. The second injection molded part 170 is opposite to the gap 122 between two adjacent magnetic tiles 120, and extends from the gap 122 to the magnetic tiles 120 on both sides to achieve the arrangement of the second injection molded part 170, so that one second injection molded part 170 can limit the radial direction of two magnetic tiles 120.

[0092] Specifically, by utilizing the first through hole 112 in the axial direction of the rotor core 110, the first injection molded part 130 passes through the rotor core 110 in the axial direction, and a certain glue position is formed on the end surface of the rotor core 110, so that an effective connection is formed between the rotor core 110, the first injection molded part 130 and the second injection molded part 170; and the second injection molded part 170 itself has a relatively good coating on the magnetic tile 120, so the rotor core 110, the first injection molded part 130 and the second injection molded part 170 form a whole, thereby ensuring the reliability of the rotor assembly 100 under various working conditions.

[0093] Specifically, the second injection molded part 170 is a plastic package.

[0094] This embodiment provides a rotor assembly 100. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0095] like Figure 4 and Figure 7 As shown, the first connecting member 160 is in contact with the wall surface of the first side of the rotor core 110 , or the first connecting member 160 is in contact with the wall surface of the second side of the rotor core 110 .

[0096] In this embodiment, the first connecting member 160 is in contact with the wall surface of the first side of the rotor core 110; or the first connecting member 160 is in contact with the wall surface of the second side of the rotor core 110 to achieve the installation and fixation of the first connecting member 160, so that the first connecting member 160 can connect the positioning assembly 180 and the first injection molded part 130.

[0097] Specifically, the first connecting member 160 is in contact with the wall surface of the first side of the rotor core 110 .

[0098] Specifically, the first connecting member 160 is in contact with the wall surface of the second side of the rotor core 110 .

[0099] Specifically, the first positioning member 140 is directly connected to the first injection molded member 130 , so that the stability of the first positioning member 140 after being connected to the first injection molded member 130 can be improved.

[0100] Specifically, the rotor assembly 100 also includes a second connecting member, which is disposed on the second side of the rotor core 110 and fits against the wall surface of the second side of the rotor core 110 . The second connecting member is connected to the second positioning member 150 and to the first injection molded part 130 .

[0101] Specifically, the first injection molded part 130 , the first positioning part 140 , the second injection molded part 170 and the first connecting part 160 are an integrated injection molded structure.

[0102] Specifically, the thickness of the first connecting member 160 along the axial direction of the rotor core 110 is greater than or equal to 0.5 mm and less than or equal to 4 mm.

[0103] Specifically, the thickness of the first connecting member 160 along the axial direction of the rotor core 110 is equal to 0.5 mm.

[0104] Specifically, the thickness of the first connection member 160 along the axial direction of the rotor core 110 is equal to 4 mm.

[0105] Specifically, the thickness of the first connection member 160 along the axial direction of the rotor core 110 is equal to 2 mm.

[0106] Specifically, the thickness of the second connecting member along the axial direction of the rotor core 110 is greater than or equal to 0.5 mm and less than or equal to 4 mm.

[0107] Specifically, the thickness of the second connection member along the axial direction of the rotor core 110 is equal to 0.5 mm.

[0108] Specifically, the thickness of the second connection member along the axial direction of the rotor core 110 is equal to 4 mm.

[0109] Specifically, the thickness of the second connection member along the axial direction of the rotor core 110 is equal to 2 mm.

[0110] This embodiment provides a rotor assembly 100. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0111] like Figure 1 and Figure 3 As shown, the rotor core 110 is provided with a counterweight hole 114 , and the counterweight hole 114 is staggered with the first connecting member 160 .

[0112] In this embodiment, the rotor core 110 is provided with a balancing weight hole 114, and the balancing weight hole 114 is staggered with the first connecting member 160 to achieve the arrangement of the balancing weight hole, so as to adjust the weight distribution of the rotor assembly 100 by adding balancing weight material into the balancing weight hole 114, and avoid the unbalanced force generated by the rotor assembly 100 when rotating due to the weight difference of the rotor assembly 100. Therefore, by providing the balancing weight hole 114, the stability of the rotor assembly 100 during rotation can be improved, and the vibration and noise generated during rotation of the rotor assembly 100 can be reduced, so as to adjust the dynamic balance of the rotor assembly 100. The staggered arrangement of the balancing weight hole 114 and the first connecting member 160 can avoid the interference of the first connecting member 160 with the weight reduction hole 118 when the balancing weight material is added into the balancing weight hole 114.

[0113] Specifically, a third through hole is provided at a position corresponding to the first connecting member 160 and the counterweight hole 114 , that is, a gap is left at a position corresponding to the first connecting member 160 and the counterweight hole 114 to facilitate adding counterweight material into the counterweight hole 114 .

[0114] Specifically, Figure 8 , Fig. 9 and Fig.10 As shown, Figure 8 A schematic structural diagram showing a rotor assembly 100 according to an embodiment of the present utility model without a counterweight hole 114 is shown; Fig. 9 A third schematic diagram of a rotor assembly 100 according to an embodiment of the present utility model is shown; Fig.10 A schematic structural diagram is shown in which a rotor core 110 according to an embodiment of the utility model is not provided with a counterweight hole 114 ; in an embodiment of the present application, a first injection molded part 130 is disposed in the first through hole 112 , and no weight reduction hole 118 is disposed on the rotor core 110 .

[0115] This embodiment provides a rotor assembly 100. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0116] like Figure 4 and Figure 8 As shown, the first injection molded part 130 is provided with a second through hole 132 , and the second through hole 132 penetrates the first injection molded part 130 along the axial direction of the rotor core 110 .

[0117] In this embodiment, the first injection molded part 130 is provided with a second through hole 132, and the second through hole 132 penetrates the first injection molded part 130 along the axial direction of the rotor core 110 to realize the arrangement of the second through hole 132. By setting the second through hole 132 in the first injection molded part 130, the weight of the first injection molded part 130 can be reduced, and then the overall weight of the rotor assembly 100 can be reduced, thereby reducing the production cost of the rotor assembly 100.

[0118] This embodiment provides a rotor assembly 100. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0119] The wall thickness of the first injection molded part 130 in the radial direction of the rotor core 110 is greater than or equal to 0.5 mm and less than or equal to 4 mm.

[0120] In this embodiment, the wall thickness of the first injection molded part 130 in the radial direction of the rotor core 110 is greater than or equal to 0.5 mm and less than or equal to 4 mm, so as to adjust the size of the wall thickness of the first injection molded part 130 in the radial direction of the rotor core 110. By setting the wall thickness of the first injection molded part 130 in the radial direction of the rotor core 110 to 0.5 mm to 4 mm, the weight of the first injection molded part 130 can be further reduced while ensuring the connection strength of the first injection molded part 130, thereby reducing the production cost of the rotor assembly 100.

[0121] Specifically, the wall thickness of the first injection molded part 130 in the radial direction of the rotor core 110 is equal to 0.5 mm.

[0122] Specifically, the wall thickness of the first injection molded part 130 in the radial direction of the rotor core 110 is equal to 2 mm.

[0123] Specifically, the wall thickness of the first injection molded part 130 in the radial direction of the rotor core 110 is equal to 4 mm.

[0124] This embodiment provides a rotor assembly 100. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0125] like Fig.10 As shown, there are a plurality of first through holes 112 , and the rotor core 110 is provided with an axial hole 116 , and the first through holes 112 are arranged around the axial hole 116 .

[0126] In this embodiment, there are multiple first through holes 112, and the rotor core 110 is provided with an axial hole 116. The first through holes 112 are arranged around the axial hole 116 to realize the arrangement of the first through holes 112 and the axial hole 116. By arranging multiple first through holes 112 around the axial hole 116, multiple first injection molded parts 130 can be arranged around the axial hole 116, so that the distribution of the multiple first injection molded parts 130 is more uniform, so that the multiple injection molded parts can fix the rotor core 110 at multiple positions, thereby improving the stability of the rotor core 110 after installation.

[0127] Specifically, the first through hole 112 may be used as a weight-reducing hole 118 , thereby reducing the weight of the rotor core 110 .

[0128] Specifically, the first through hole 112 may be used as a through hole other than the lightening hole 118 .

[0129] This embodiment provides a rotor assembly 100. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0130] like Fig.11 As shown, Fig.11One of the schematic diagrams of the weight-reducing holes 118 according to an embodiment of the present utility model is shown; the rotor core 110 is provided with a plurality of weight-reducing holes 118 , and the plurality of weight-reducing holes 118 are arranged around the shaft hole 116 .

[0131] In this embodiment, the rotor core 110 is provided with a plurality of weight-reducing holes 118, and the plurality of weight-reducing holes 118 are arranged around the shaft hole 116. The arrangement of the plurality of weight-reducing holes 118 can reduce the weight of the rotor core 110, so as to achieve lightweighting of the rotor assembly 100. Moreover, the arrangement of the plurality of weight-reducing holes 118 around the shaft hole 116 can also improve the stability of the rotor assembly 100 during rotation.

[0132] Specifically, the lightening hole 118 is a special-shaped hole.

[0133] Specifically, the first injection molded part 130 may pass through the lightening hole 118 or the first through hole 112 , or the first injection molded part 130 may pass through the lightening hole 118 and the first through hole 112 respectively, to ensure the connection between the rotor core 110 and the plastic.

[0134] This embodiment provides a rotor assembly 100. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0135] like Fig.11 As shown, the plurality of lightening holes 118 and the plurality of first through holes 112 are arranged alternately.

[0136] In this embodiment, the multiple weight-reducing holes 118 and the multiple first through holes 112 are alternately arranged to achieve the arrangement of the multiple weight-reducing holes 118 and the multiple first through holes 112, so that the multiple weight-reducing holes 118 and the multiple first through holes 112 are independent of each other, avoiding interference between the multiple weight-reducing holes 118 and the multiple first through holes 112, thereby reducing the weight of the rotor core 110 and improving the stability of the rotor core 110 after installation.

[0137] Specifically, Fig.11 , Fig.12 , Fig.13 , Fig.14 , Fig.15 and Fig.16 As shown, Fig.12 A fourth structural schematic diagram of the first injection molded part 130 and the second injection molded part 170 according to an embodiment of the present utility model is shown; Fig.13 One of the structural schematic diagrams showing a rotor assembly 100 provided with a weight-reducing hole 118 according to an embodiment of the utility model is shown; Fig.14 A fifth structural schematic diagram of a first injection molded part 130 and a second injection molded part 170 according to an embodiment of the present utility model is shown; Fig.15A fourth schematic diagram of a rotor assembly 100 according to an embodiment of the present utility model is shown; Fig.16 The sixth structural schematic diagram shows a first injection molded part 130 and a second injection molded part 170 according to an embodiment of the utility model; in the rotor assembly 100 of the present application, by setting weight-reducing holes 118 on the rotor core 110, a plurality of weight-reducing holes 118 and a plurality of first through holes 112 are alternately arranged.

[0138] This embodiment provides a rotor assembly 100. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0139] like Fig.17 As shown, Fig.17 A second schematic diagram of the weight-reducing holes 118 according to an embodiment of the utility model is shown; a plurality of first through holes 112 are arranged along the outer periphery of the plurality of weight-reducing holes 118; in the radial direction of the rotor core 110, the plurality of first through holes 112 are opposite to the plurality of weight-reducing holes 118, or the plurality of first through holes 112 are opposite to the gaps 122 between the plurality of weight-reducing holes 118.

[0140] In this embodiment, the plurality of first through holes 112 are arranged along the outer periphery of the plurality of weight-reducing holes 118, so as to realize the arrangement of the plurality of weight-reducing holes 118 and the plurality of first through holes 112. In the radial direction of the rotor core 110, the plurality of first through holes 112 are opposite to the plurality of weight-reducing holes 118, or the plurality of first through holes 112 are opposite to the gaps 122 between the plurality of weight-reducing holes 118, that is, the plurality of first through holes 112 and the plurality of weight-reducing holes 118 are arranged in the same direction in the radial direction or arranged in an interlaced manner, so as to reduce the weight of the rotor core 110 and improve the stability of the rotor core 110 after installation.

[0141] Specifically, Fig.17 , Fig.18 , Fig.19 , Fig. 20 , Fig.21 and Fig. 22 As shown, Fig.17 A second schematic diagram of the weight-reducing hole 118 according to an embodiment of the present utility model is shown; Fig.18 FIG7 shows a seventh structural schematic diagram of a first injection molded part 130 and a second injection molded part 170 according to an embodiment of the present utility model; Fig.19 A second structural schematic diagram showing a rotor assembly 100 provided with a weight-reducing hole 118 according to an embodiment of the utility model; Fig. 20 An eighth structural schematic diagram of a first injection molded part 130 and a second injection molded part 170 according to an embodiment of the present utility model is shown; Fig.21 A fifth schematic diagram of a rotor assembly 100 according to an embodiment of the present utility model is shown; Fig. 22A ninth structural schematic diagram shows a first injection molded part 130 and a second injection molded part 170 according to an embodiment of the utility model; in the rotor assembly 100 of the present application, by setting weight-reducing holes 118 on the rotor core 110, a plurality of first through holes 112 are arranged along the periphery of the plurality of weight-reducing holes 118.

[0142] This embodiment provides a rotor assembly 100. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0143] like Fig.13 As shown, the first through hole 112 is opposite to the gap 122 between two adjacent magnetic tiles 120 among the plurality of magnetic tiles 120; Fig.19 As shown, the first through hole 112 is opposite to the center line of the magnetic tile 120 in the circumferential direction of the rotor core 110 .

[0144] In this embodiment, the first through hole 112 is opposite to the gap 122 between two adjacent magnetic tiles 120 among the multiple magnetic tiles 120, or the first through hole 112 is opposite to the center line of the magnetic tile 120 in the circumferential direction of the rotor core 110, so as to realize the arrangement of the first through hole 112, so that the first injection molded part 130 can be opposite to the gap 122 between two adjacent magnetic tiles 120 among the multiple magnetic tiles 120, and the first through hole 112 is opposite to the center line of the magnetic tile 120 in the circumferential direction of the rotor core 110, so that the first injection molded part 130 can have different arrangements, so that the first injection molded part 130 can fix the rotor core 110 under different arrangements.

[0145] like Fig.23 As shown, Fig.23 A structural block diagram of a motor 200 according to an embodiment of the present invention is shown; in an embodiment of the present application, a motor 200 is provided, comprising a rotor assembly 100 in any of the above embodiments. Therefore, the motor 200 has all the beneficial effects of the rotor assembly 100, which will not be described in detail here.

[0146] In the claims, specification and drawings of the present invention, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, which is only for the purpose of more conveniently describing the present invention and making the description process easier, rather than for indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limitations on the present invention; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on the specific circumstances of the above data.

[0147] In the claims, specification and drawings of the present invention, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0148] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A rotor assembly, characterized in that: include: A rotor core, wherein the rotor core is provided with a first through hole, and the first through hole penetrates the rotor core along the axial direction of the rotor core; A plurality of magnetic tiles, the plurality of magnetic tiles are distributed along the circumference of the rotor core and are arranged on the side walls of the rotor core; a first injection molded part, the first injection molded part being disposed in the first through hole and extending from the first side of the rotor core to the second side of the rotor core; A positioning assembly, wherein the positioning assembly is disposed on a first side of the rotor core and / or a second side of the rotor core; A first connecting member, the first connecting member is connected to the positioning assembly and to the first injection molded part; The first side of the rotor core and the second side of the rotor core are two sides of the rotor core that are opposite to each other in the axial direction.

2. The rotor assembly according to claim 1, characterized in that There are multiple first connecting members, and the multiple first connecting members are arranged at intervals along the circumferential direction of the rotor core.

3. The rotor assembly according to claim 1, characterized in that: The first connecting member is arranged in a ring shape along the circumference of the rotor core.

4. The rotor assembly according to claim 1, characterized in that: The positioning component comprises: A first positioning member, the first positioning member is disposed on a first side of the rotor core and connected to the first injection molded part; A second positioning member is disposed on a second side of the rotor core and connected to the first injection molded part.

5. The rotor assembly according to claim 4, characterized in that: The magnetic shoe contacts the first positioning member at a first side of the rotor core in the axial direction; The magnetic shoe contacts the second positioning member at a second side of the rotor core in the axial direction.

6. The rotor assembly according to claim 4, characterized in that: Also includes: A second injection-molded part, the second injection-molded part is located on the side of the magnetic tile away from the axis of the rotor core, contacts a portion of the side wall of the magnetic tile, the second injection-molded part is connected to the first positioning part on the first side in the axial direction of the rotor core, and the second injection-molded part is connected to the second positioning part on the second side in the axial direction of the rotor core.

7. The rotor assembly according to claim 4, characterized in that The first connecting member is in contact with the wall surface of the first side of the rotor core; or The first connecting member is in contact with the wall surface of the second side of the rotor core.

8. The rotor assembly according to claim 7, characterized in that The rotor core is provided with a counterweight hole, and the counterweight hole is staggered with the first connecting member.

9. The rotor assembly according to claim 1, characterized in that: The first injection molded part is provided with a second through hole, and the second through hole penetrates the first injection molded part along the axial direction of the rotor core.

10. The rotor assembly according to claim 9, characterized in that The wall thickness of the first injection molded part in the radial direction of the rotor core is greater than or equal to 0.5 mm and less than or equal to 4 mm.

11. The rotor assembly according to claim 1, characterized in that The number of the first through holes is plural, the rotor core is provided with an axial hole, and the first through holes are arranged around the axial hole.

12. The rotor assembly according to claim 11, characterized in that The rotor core is provided with a plurality of weight-reducing holes, and the plurality of weight-reducing holes are arranged around the shaft hole.

13. The rotor assembly according to claim 12, characterized in that The plurality of weight-reducing holes and the plurality of the first through holes are arranged alternately.

14. The rotor assembly according to claim 12, characterized in that The plurality of first through holes are arranged along the outer periphery of the plurality of weight-reducing holes; In the radial direction of the rotor core, the plurality of first through holes are opposite to the plurality of weight-reducing holes, or the plurality of first through holes are opposite to the gaps between the plurality of weight-reducing holes.

15. The rotor assembly according to any one of claims 1 to 14, characterized in that The first through hole is opposite to the gap between two adjacent magnetic tiles among the plurality of magnetic tiles; or The first through hole is opposite to a center line of the magnetic shoe in the circumferential direction of the rotor core.

16. A motor, characterized in that: Comprising a rotor assembly as claimed in any one of claims 1 to 15.

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