Rotor assembly, electric motor and electrical apparatus

Abstract

A rotor assembly (100), an electric motor and an electrical apparatus. The rotor assembly (100) comprises: a rotor core (10), which comprises a plurality of core units (11) arranged at intervals along the circumference; and a connector (20), which comprises a connecting main body (22) arranged on inner sides in the radial direction of the plurality of core units (11), and a plurality of connecting structures (21) sequentially arranged at intervals on an outer side in the circumferential direction of the connecting main body (22) and adapted to be in location-fit with the core units (11) in axial and radial directions.

Description

Rotor assemblies, motors and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202310930253.8, entitled “Rotor assembly, motor and electrical equipment” filed by Huaian Welling Motor Manufacturing Co., Ltd. and Foshan Welling Washing Motor Manufacturing Co., Ltd. on July 26, 2023, and Chinese patent application No. 202321992869.X, entitled “Rotor assembly, motor and electrical equipment” filed on July 26, 2023. Technical Field

[0003] The present application relates to the field of motor technology, and in particular to a rotor assembly, a motor, and an electrical device. Background Art

[0004] Brushless DC motors usually use an integrated rotor structure. There is a magnetic isolation bridge inside the integrated rotor structure. The magnetic isolation bridge will cause magnetic leakage problems inside the rotor, resulting in low utilization of permanent magnets and reduced motor performance.

[0005] In the related art, the magnetic leakage problem is solved by arranging the rotor core in blocks. However, the block arrangement of the rotor core results in low structural strength of the rotor core, which cannot meet the requirements of high-speed operation.

[0006] Application Contents

[0007] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0008] To this end, the present application proposes a rotor assembly having high structural strength.

[0009] The present application also proposes a motor.

[0010] The present application further proposes an electrical device.

[0011] According to the rotor assembly of the present application, it includes: a rotor core, which includes a plurality of core units, and the plurality of core units are arranged at circumferential intervals; a connecting member, which includes: a connecting body, which is arranged on the radial inner side of the plurality of core units; and a plurality of connecting structures, which are arranged in sequence at intervals on the circumferential outer side of the connecting body and are suitable for positioning and cooperating with the core units in the axial and radial directions.

[0012] Therefore, it is connected to the core unit through the connecting piece and positioned with the rotor core through the connecting structure, which facilitates the assembly of the connecting piece and the rotor core. At the same time, the connecting structure can provide radial force for the core unit. When the rotor core rotates at high speed, the connecting structure can prevent the core unit from being radially displaced by centrifugal force, thereby improving the reliability of the rotor core rotation and improving the structural strength of the rotor core.

[0013] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a structural schematic diagram 1 of a rotor core according to an embodiment of the present application;

[0015] FIG2 is a second structural diagram of the rotor core according to an embodiment of the present application;

[0016] FIG3 is a schematic structural diagram of a connector according to an embodiment of the present application;

[0017] FIG4 is a schematic diagram of the cooperation between the connector and the rotor core according to an embodiment of the present application;

[0018] FIG5 is a schematic diagram of the arrangement of multiple magnetic members according to an embodiment of the present application;

[0019] FIG6 is a schematic diagram of the coordination of the magnetic member, the connector, and the rotor core according to an embodiment of the present application;

[0020] FIG7 is a first schematic diagram of the coordination of the magnetic member, the rotating shaft, the connecting member, and the rotor core according to an embodiment of the present application;

[0021] FIG8 is a second schematic diagram of the coordination of the magnetic member, the rotating shaft, the connecting member, and the rotor core according to an embodiment of the present application;

[0022] FIG9 is a schematic structural diagram of the rotor assembly according to an embodiment of the present application. Modes for Carrying Out the Invention

[0023] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0024] The following content should be integrated into the writing process as needed to explain the relevant content:

[0025] In the description of this application, it should be understood that the terms "inner", "outer", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0026] The rotor assembly 100 according to an embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0027] In conjunction with Figures 1 to 4, the rotor assembly 100 according to the present application includes: a rotor core 10 and a connecting member 20, the rotor core 10 includes a plurality of core units 11, and the plurality of core units 11 are arranged at intervals in a circumferential manner, the connecting member 20 includes: a connecting body 22 and a plurality of connecting structures 21, the connecting body 22 is arranged on the radial inner side of the plurality of core units 11, and the plurality of connecting structures 21 are arranged in sequence at intervals on the circumferential outer side of the connecting body 22, and are suitable for positioning and cooperating with the core units 11 in the axial direction and the radial direction.

[0028] Multiple core units 11 are spaced apart in sequence and arranged in a circular pattern. The radial inner ends of the multiple core units 11 are spaced apart so that the middle position of the circle formed by the multiple core units 11 is hollowed out. The connecting body 22 is arranged at the hollow position, and the connecting body 22 and the multiple core units 11 are arranged relative to each other in the radial direction. The connecting structure 21 is arranged on the radial outside of the connecting body 22, and the connecting structure 21 can be positioned and matched with the core unit 11. The multiple core units 11 are connected to the connecting body 22 through the connecting structure 21, so that the connecting member 20 can connect the multiple core units 11.

[0029] Among them, the connecting structure 21 can be positioned and matched with the core unit 11 in the axial direction to facilitate the assembly of the connecting part 20. At the same time, the connecting structure 21 can be positioned and matched with the core unit 11 in the radial direction. The connecting structure 21 can provide radial force for the core unit 11. When the rotor core 10 rotates at high speed, the connecting structure 21 can prevent the core unit 11 from being subjected to radial displacement due to centrifugal force, thereby improving the rotation reliability of the rotor assembly 100 and effectively improving the structural strength of the rotor core 10.

[0030] In the related art, the rotor core adopts a magnetic isolation bridge disconnection structure, making the rotor core a split structure to prevent magnetic leakage in the rotor core. However, the structural strength of this structure is low and cannot be applied to the working conditions of high-speed operation of the rotor assembly.

[0031] According to the rotor assembly 100 of the present application, it is connected to the core unit 11 through the connecting member 20, and is positioned and matched with the rotor core 10 through the connecting structure 21, which facilitates the assembly of the connecting member 20 and the rotor core 10. At the same time, the connecting structure 21 can provide radial force for the core unit 11. When the rotor core 10 rotates at high speed, the positioning effect of the connecting structure 21 can prevent radial displacement of the core unit 11 due to centrifugal force, thereby improving the rotation reliability of the rotor assembly 100 and effectively improving the structural strength of the rotor core 10.

[0032] In combination with Figures 1 to 4, in some embodiments of the present application, the core unit 11 is provided with a connecting hole 111 that is arranged through the axial direction, and the connecting structure 21 includes a connecting column 211, which is connected to the connecting body 22 and passes through the connecting hole 111 along the axial direction.

[0033] The connecting hole 111 is arranged close to the radial outer side of the core unit 11, and the connecting column 211 is arranged on the radial outer side of the connecting body 22 and is connected to the connecting body 22. When the connector 20 and the core unit 11 are assembled, the connecting column 211 is passed through the connecting hole 111 and can provide radial force for the core unit 11 to achieve radial positioning and matching of the connecting column 211 and the core unit 11, thereby preventing the core unit 11 from being subjected to centrifugal force and generating radial displacement, thereby ensuring the rotation reliability of the rotor core 10.

[0034] As shown in FIG. 3 , in some embodiments of the present application, the connection structure 21 further includes a connection arm, which extends in a radial direction and is connected to the connection column 211 and the connection body 22 , respectively.

[0035] The connecting body 22 and the connecting column 211 are spaced apart in the radial direction to facilitate plug-in cooperation with the connecting hole 111. The connecting arm extends in the radial direction, the radial inner end of the connecting arm is connected to the connecting body 22, and the radial outer end of the connecting arm is connected to the connecting column 211, thereby connecting the connecting column 211 to the connecting body 22.

[0036] 3 and 4 , in some embodiments of the present application, the connecting arm includes a first connecting arm 212 and a second connecting arm 213 . The first connecting arm 212 and the second connecting arm 213 are spaced apart in the axial direction and are respectively arranged on both axial sides of the core unit 11 .

[0037] The first connecting arm 212 is connected to the connecting column 211 and one axial side of the connecting body 22, and the first connecting arm 212 is arranged on one axial side of the core unit 11, and the second connecting arm 213 is connected to the connecting column 211 and the other axial side of the connecting body 22, and the second connecting arm 213 is arranged on the side of the core unit 11 away from the second connecting arm 213.

[0038] Therefore, the connecting column 211 is passed through the core unit 11, and the connecting body 22 is arranged on the radial inner side of the core unit 11 to realize the positioning and cooperation of the connecting member 20 and the core unit 11 in the radial direction. By arranging the first connecting arm 212 and the second connecting arm 213 at the axial ends of the connecting column 211 and the connecting body 22, and the first connecting arm 212 and the second connecting arm 213 are respectively arranged on the axial sides of the core unit 11, the first connecting arm 212 and the second connecting arm 213 can position the core unit 11 in the axial direction to prevent the rotor core 10 from shaking in the axial direction.

[0039] In combination with Figures 1 to 3, in some embodiments of the present application, the core unit 11 is provided with a positioning groove 112, which is open from the inner end of the core unit 11 and extends outward in the radial direction. The connecting structure 21 includes an extension portion 214 and a positioning portion 215. The extension portion 214 extends outward in the radial direction from the connecting body 22. The positioning portion 215 is provided on the extension portion 214 and is used to position and cooperate with the positioning groove 112, wherein a radial force point is formed between the positioning portion 215 and the wall surface of the positioning groove 112.

[0040] The core unit 11 is constructed as a fan-shaped structure, and the hollow position of the circle formed by multiple core units 11 is constructed as a columnar space. A positioning groove 112 is formed at one end of the core unit 11 close to the connecting piece 20, which is recessed outward in the radial direction, and the positioning groove 112 is spaced apart from the outer side wall of the core unit 11, so that the positioning groove 112 is constructed as a groove structure with an open inner end and a closed outer end.

[0041] The connecting body 22 is arranged in the columnar space. The connecting body 22 can be constructed as a column to adapt to the columnar space. The radial inner end of the extension part 214 is connected to the outer peripheral wall of the connecting body 22. A positioning part 215 is provided on the extension part 214. The positioning part 215 can be radially abutted with the inner wall surface of the positioning groove 112, so that a radial force point is formed between the positioning part 215 and the inner wall surface of the positioning groove 112, which facilitates the positioning and matching of the positioning part 215 and the positioning groove 112, thereby facilitating the positioning and matching of the core unit 11 and the connecting member 20, thereby improving the structural strength of the rotor assembly 100 and effectively improving the rotation reliability of the rotor assembly 100.

[0042] The positioning groove 112 and the connecting hole 111 can be collinear and spaced apart in the radial direction, the extension portion 214 and the positioning portion 215 can be arranged between the first connecting arm 212 and the second connecting arm 213 in the radial direction, and the extension portion 214 and the positioning portion 215 are spaced apart from the connecting column 211 in the radial direction to facilitate the processing and assembly of the connecting member 20.

[0043] In some embodiments of the present application, the positioning portion 215 is disposed at the outer end of the extending portion 214 .

[0044] The positioning portion 215 is arranged at one end of the extension portion 214 away from the connecting body 22 to facilitate the processing of the connecting piece 20. The width dimension of the positioning portion 215 is larger than the width dimension of the extension portion 214. For example, the extension portion 214 can be constructed as a square columnar body, and the positioning portion 215 can be constructed as a cylindrical body. The diameter dimension of the positioning portion 215 is larger than the width of the extension portion 214. The shape of the positioning groove 112 is constructed to be adapted to the positioning portion 215 and the extension portion 214, that is, the outer end of the positioning groove 112 (the closed end of the positioning groove 112) can be constructed as a cylindrical groove structure whose size and shape are adapted to the positioning portion 215. The positioning portion 215 can be stopped and matched with the inner wall surface of the cylindrical groove structure to form a radial force point, so that the connecting piece 20 can be positioned and matched with the core unit 11.

[0045] When the rotational speed of the rotor assembly 100 is relatively high, the connecting member 20 can provide the core unit 11 with a radially inward pulling force to offset the centrifugal force acting on the core unit 11, thereby preventing the core unit 11 from being disengaged from the connecting structure 21 when the centrifugal force is relatively high, thereby improving the structural strength of the rotor core 10.

[0046] It should be noted that the extension portion 214, the positioning portion 215 and the positioning groove 112 can be constructed as positioning matching structures of other shapes. As long as the positioning effect of the positioning portion 215, the extension portion 214 and the positioning groove 112 can be guaranteed, the specific structural shape is not limited here.

[0047] 1 , 2 , 5 and 6 , in some embodiments of the present application, an accommodating groove 30 is defined between any two adjacent core units 11 and the connecting body 22 , and the accommodating groove 30 is used to arrange the magnetic member 40 .

[0048] Adjacent core units 11 are spaced apart to prevent the inner and outer ends of the rotor core 10 from forming a magnetic isolation bridge. The connector 20 can connect multiple core units 11. At the same time, the connector 20 can be made of non-magnetic material or weakly magnetic material, so that the connector 20 can also play a magnetic isolation role, effectively preventing magnetic leakage in the rotor core 10, improving the utilization rate of the magnetic parts 40, and improving the performance of the motor.

[0049] The connecting body 22 is arranged at the inner end of the core unit 11, so that a receiving groove 30 is defined between every two adjacent core units 11 and the connecting body 22. The magnetic part 40 and the receiving groove 30 are adapted to each other, and the magnetic part 40 can be installed in the receiving groove 30. The connecting body 22 and the magnetic part 40 are arranged relative to each other in the radial direction. The connecting body 22 can limit the magnetic part 40 in the radial direction, thereby improving the assembly stability of the magnetic part 40.

[0050] In addition, a radial limiting portion 113 is formed at the outer end of the core unit 11. The radial limiting portions 113 formed on every two adjacent core units 11 extend relative to each other. The radial limiting portions 113 can be engaged with the outer end of the magnetic part 40 in the radial direction to limit the magnetic part 40 in the radial direction and prevent the magnetic part 40 from falling out of the installation groove.

[0051] The magnetic member 40 may be configured as a magnetic tile.

[0052] In some embodiments of the present application, the number of magnetic members 40 is an even number.

[0053] There are multiple magnetic parts 40, and the number of magnetic parts 40 is the same as the number of core units 11 and is an even number. When the number of magnetic parts 40 and core units 11 is n, the rotor core 10 can form n / 2 pairs of magnetic poles to prevent unilateral magnetic pull from being generated in the rotor assembly 100, ensuring that the motor is subjected to stable force during operation, thereby ensuring the operating effect of the motor.

[0054] 7 and 8 , in some embodiments of the present application, the rotor assembly 100 further includes a rotating shaft 50 , and the connecting body 22 is sleeved on the rotating shaft 50 and connected to the rotating shaft 50 .

[0055] The rotating shaft 50 extends in the axial direction, and the connecting body 22 is sleeved on the radial outer side of the rotating shaft 50. The connecting body 22 is connected to the rotating shaft 50 so that the connecting body 22, the rotating shaft 50 and the core unit 11 can rotate synchronously.

[0056] As shown in FIG. 7 , in some embodiments of the present application, the rotating shaft 50 and the connecting body 22 are spaced apart in the radial direction, the rotor core 10 and the rotating shaft 50 are integrally plastic-wrapped, and part of the plastic is filled between the rotating shaft 50 and the connecting body 22 .

[0057] When the magnetic part 40 and the rotating shaft 50 are assembled with the rotor core 10, the rotating shaft 50 is spaced apart from the inner wall of the connecting body 22. The magnetic part 40, the rotor core 10 and the connecting part 20 can be placed in a mold and the rotor core 10, the connecting part 20 and the rotating shaft 50 can be integrally overmolded. The rotor core 10, the connecting part 20 and the rotating shaft 50 can be connected by overmolding. At the same time, the space between the connecting body 22 and the rotating shaft 50 can be filled with overmolding material to connect the rotating shaft 50 and the connecting part 20, thereby improving the structural strength of the rotor assembly 100 and thus improving the rotation reliability of the rotor assembly 100.

[0058] 9 , in some embodiments of the present application, the overmolding material forms overmolding portions 60 on both axial sides of the rotor core 10 , respectively. The overmolding portions 60 are used to fix the core unit 11 , the connector 20 , and the magnetic member 40 .

[0059] The connecting member 20 and the rotor core 10 can be integrally overmolded with plastic to improve the roundness of the rotor core 10 composed of multiple segmented cores, and the overmolding forms a plastic-coated portion 60 at the axial ends of the connecting member 20 and the rotor core 10. The plastic-coated portion 60 can fix the connecting member 20 and the rotor core 10 in the axial direction. The magnetic member 40 is arranged between the rotor core 10 and the connecting member 20. The plastic-coated portion 60 can be simultaneously covered on the magnetic member 40, thereby fixing the connecting member 20, the magnetic member 40 and the rotor core 10, improving the stability of the magnetic member 40, and improving the structural strength of the rotor assembly 100.

[0060] By positioning the connector 20 with the core unit 11, when the rotor core 10 rotates at high speed, the connector 20 can generate a radial force on the core unit 11 to offset the centrifugal force acting on the core unit 11, thereby preventing the core unit 11 from moving radially when the centrifugal force is large, thereby preventing the overmolded portion 60 from cracking due to the displacement stress of the core unit 11.

[0061] In addition, the plastic coating may form a plastic coating layer on the radially outer side of the rotor core 10 to fix the rotor core 10 and improve the structural strength of the rotor core 10 .

[0062] In some embodiments of the present application, the connecting member 20 is an integrally formed member.

[0063] The connector 20 can be constructed as an integrally formed part to facilitate the processing of the connector 20 and the assembly of the connector 20 and the core unit 11, thereby reducing the difficulty of assembling the rotor assembly 100 and improving the convenience of assembly.

[0064] In some embodiments of the present application, the connecting member 20 is constructed as a cast aluminum member.

[0065] The cast aluminum part has high structural strength, which can ensure the positioning effect of the connecting part 20 on the core unit 11, reduce the risk of the connecting part 20 being damaged by the displacement stress of the core unit 11, thereby ensuring the structural strength of the rotor assembly 100. In addition, the cast aluminum part is non-magnetic, so that the connecting part 20 can have a magnetic isolation effect, preventing the formation of a magnetic isolation bridge between the inner and outer ends of the rotor core 10. At the same time, the cost of the cast aluminum part is low, which can effectively reduce the production cost of the rotor assembly 100.

[0066] In some embodiments of the present application, a buckle point 70 is provided on the core unit 11 .

[0067] The core unit 11 is formed by stacking a plurality of silicon steel sheets. The plurality of stacked silicon steel sheets can be connected via fastening points 70 , wherein the fastening points 70 can be constructed as rivet fastening points.

[0068] The motor according to the present application includes the rotor assembly 100 described above.

[0069] Since the motor is provided with the above-mentioned rotor assembly 100, it is connected to the core unit 11 through the connecting member 20, and is positioned and matched with the rotor core 10 through the connecting structure 21, which facilitates the assembly of the connecting member 20 and the rotor core 10. At the same time, the connecting structure 21 can provide radial force for the core unit 11. When the rotor core 10 rotates at high speed, the positioning effect of the connecting structure 21 can prevent radial displacement of the core unit 11 due to centrifugal force, thereby improving the rotation reliability of the rotor assembly 100 and effectively improving the structural strength of the rotor core 10.

[0070] The electrical equipment according to the present application includes the above-mentioned motor.

[0071] Since the electrical equipment is provided with the above-mentioned motor, it is connected to the core unit 11 through the connecting piece 20, and is positioned and matched with the rotor core 10 through the connecting structure 21, which facilitates the assembly of the connecting piece 20 and the rotor core 10. At the same time, the connecting structure 21 can provide radial force for the core unit 11. When the rotor core 10 rotates at high speed, the positioning effect of the connecting structure 21 can prevent radial displacement of the core unit 11 due to centrifugal force, thereby improving the rotation reliability of the rotor assembly 100 and effectively improving the structural strength of the rotor core 10.

[0072] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" 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 application. In this specification, the illustrative expressions 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 suitable manner in any one or more embodiments or examples.

[0073] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotor assembly, comprising: A rotor core, the rotor core comprising a plurality of core units, wherein the plurality of core units are arranged at intervals in a circumferential manner; A connecting piece, the connecting piece comprising: A connecting body, the connecting body being arranged radially inward of the plurality of core units; A plurality of connection structures are arranged in sequence and spaced apart on the circumferential outer side of the connection body, and are suitable for positioning and matching with the core unit in the axial direction and the radial direction.

2. The rotor assembly according to claim 1, wherein: The core unit is provided with a connecting hole extending through the core unit in the axial direction; The connection structure comprises a connection column, which is connected to the connection body and penetrates the connection hole along the axial direction.

3. The rotor assembly according to claim 2, wherein: The connection structure further includes a connection arm, which extends in a radial direction and is respectively connected to the connection column and the connection body.

4. The rotor assembly according to claim 3, wherein: The connecting arm includes a first connecting arm and a second connecting arm. The first connecting arm and the second connecting arm are arranged at intervals in the axial direction and are respectively arranged on both sides of the axial direction of the core unit.

5. The rotor assembly according to any one of claims 1 to 4, wherein: The core unit is provided with a positioning groove, the positioning groove is opened from the inner end of the core unit and extends outward along the radial direction; The connection structure comprises an extension portion and a positioning portion, wherein the extension portion extends outwardly from the connection body in a radial direction, and the positioning portion is arranged on the extension portion and is used for positioning and cooperating with the positioning groove; Wherein, a radial force point is formed between the positioning portion and the wall surface of the positioning groove.

6. The rotor assembly according to any one of claims 1 to 5, wherein: An accommodating groove is defined between any two adjacently arranged core units and the connecting body, and the accommodating groove is used for arranging the magnetic member.

7. The rotor assembly according to any one of claims 1 to 6, wherein: The rotor assembly also includes a rotating shaft, and the connecting body is sleeved on the rotating shaft and connected to the rotating shaft.

8. The rotor assembly according to claim 7, wherein: The rotating shaft and the connecting body are spaced apart in the radial direction, the rotor core and the rotating shaft are integrally coated with plastic, and part of the plastic is filled between the rotating shaft and the connecting body.

9. The rotor assembly according to claim 8, wherein: The coating material forms coating parts on both axial sides of the rotor core, respectively, and the coating parts are used to fix the core unit, the connecting member and the magnetic member.

10. The rotor assembly according to any one of claims 1 to 9, wherein: The connecting piece is an integrally formed piece.

11. The rotor assembly according to claim 10, wherein: The connecting piece is configured as a cast aluminum part.

12. An electric machine comprising a rotor assembly according to any one of claims 1-11.

13. An electrical device comprising the motor according to claim 12.

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