Rotor assembly, electric machine and electric appliance

Abstract

The application discloses a rotor assembly, a motor and an electrical appliance. The rotor assembly comprises a connecting piece and a rotor core. The connecting piece comprises a body part and a plurality of connecting parts. The plurality of connecting parts are connected to the body part and are arranged at intervals along the circumference of the body part. The rotor core comprises a plurality of core units. The plurality of core units are arranged at intervals along the direction surrounding the connecting piece. The plurality of core units are connected to the plurality of connecting parts correspondingly, and the core units and the connecting parts are constrained to each other in the radial direction of the rotor assembly. The connecting piece further comprises a first limiting part. At least one connecting part is connected to the first limiting part at at least one end in the axial direction of the rotor assembly. The first limiting part protrudes from the end of the core unit in the axial direction and abuts against the end surface of the end of the core unit in the axial direction. The rotor assembly has high structural strength and can meet the demand of high-speed operation.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a rotor assembly, motor, and electrical equipment. Background Technology

[0002] To reduce magnetic leakage, the rotor core of an electric motor typically employs a segmented structure to minimize magnetic bridges, thereby increasing the utilization rate of permanent magnets and improving motor performance. However, the segmented rotor core has lower structural strength, posing a risk of deformation and cracking during high-speed operation, thus failing to meet the demands of high-speed operation. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a rotor assembly with high structural strength that can meet the requirements of high-speed operation.

[0004] The present invention also provides a motor and electrical equipment having the above-described rotor assembly.

[0005] According to a first aspect of the present invention, a rotor assembly includes a connector, which includes a body portion and a plurality of connecting portions, the plurality of connecting portions being connected to the body portion and arranged at circumferential intervals along the body portion; a rotor core, which includes a plurality of core units, the plurality of core units being arranged at intervals along a direction surrounding the connector, the plurality of core units being correspondingly connected to the plurality of connecting portions, and the core units and the connecting portions constraining each other in the radial direction of the rotor assembly; wherein the connector further includes a first limiting portion, at least one end of at least one of the connecting portions along the axial direction of the rotor assembly being connected to the first limiting portion, the first limiting portion protruding from the end of the core unit along the axial direction and abutting against the end face of the core unit at the end along the axial direction.

[0006] According to a first aspect of the present invention, the rotor assembly has at least the following advantages: by providing a connector connected to multiple core units, and the connector and the core units mutually constraining each other in the radial direction of the rotor assembly, the multiple core units are connected as a whole. Simultaneously, the connector is provided with a first limiting portion abutting against one end face of the core unit along the axial direction, which enables the connector and the core unit to mutually limit each other in the axial direction, enhancing the bonding strength between the connector and the rotor core, thereby enhancing the overall structural strength of the rotor assembly. When the rotor assembly operates at high speed, the connector can apply a force to the core unit to counteract centrifugal force, ensuring a tight bond between the core unit and the connector, effectively reducing the risk of deformation and cracking of the rotor assembly, thus meeting the requirements of high-speed operation.

[0007] According to some embodiments of the present invention, the maximum distance between the two ends of the first limiting portion along the circumferential direction is greater than the maximum distance between the two ends of the connecting portion along the circumferential direction.

[0008] According to some embodiments of the present invention, along the circumferential direction, the two ends of the first limiting portion protrude from the two ends of the connecting portion, respectively.

[0009] According to some embodiments of the present invention, the first limiting portion is located at one end of the connecting portion away from the body portion, and the first limiting portion protrudes outward along the radial direction from the end of the connecting portion.

[0010] According to some embodiments of the present invention, the body portion is provided with a plurality of grooves, and there is one groove between each two adjacent connecting portions. The grooves are recessed inward along the radial direction. The body portion further includes positioning portions located on both sides of the grooves along the circumferential direction. The positioning portions are used to position the permanent magnet.

[0011] According to some embodiments of the present invention, the maximum depth of the groove along the radial direction is D, which satisfies: 1.5mm≤D≤3mm.

[0012] According to some embodiments of the present invention, the connecting portion includes an extension portion and a second limiting portion. One end of the extension portion is connected to the outer peripheral wall of the main body portion, and the other end extends outward along the radial direction. The second limiting portion is connected to one end of the extension portion away from the main body portion. The maximum distance between the two ends of the second limiting portion along the circumferential direction is greater than the maximum distance between the two ends of the extension portion along the circumferential direction. The core unit is provided with a limiting groove for accommodating the second limiting portion and at least a portion of the extension portion.

[0013] According to some embodiments of the present invention, the second limiting portion protrudes from two wall surfaces opposite to each other along the circumferential direction at both ends of the extension portion.

[0014] According to some embodiments of the present invention, the rotor assembly further includes a plastic-coated body and a plurality of permanent magnets, an mounting groove is provided between two adjacent core units, and the plurality of permanent magnets are correspondingly mounted in the plurality of mounting grooves, wherein the plastic-coated body covers the connector, the rotor core and the plurality of permanent magnets.

[0015] According to some embodiments of the present invention, the rotor assembly further includes a rotating shaft, the body portion is provided with a through hole, the rotating shaft passes through the through hole and is fixedly connected to the body portion.

[0016] The motor according to a second aspect of the present invention includes the rotor assembly of the first aspect of the present invention.

[0017] The motor according to a second aspect embodiment of the present invention has at least the following beneficial effects: Because the motor employs the aforementioned rotor assembly, and by providing connectors that connect to multiple core units, and by mutually constraining the connectors and core units radially in the rotor assembly, the multiple core units are connected as a whole. Simultaneously, the connectors are provided with a first limiting portion abutting against the end face of one axial end of the core unit, enabling mutual axial positioning between the connectors and the core units, enhancing the bonding strength between the connectors and the rotor core, thereby strengthening the overall structural strength of the rotor assembly. When the rotor assembly operates at high speed, the connectors can apply a force to the core units to counteract centrifugal force, ensuring a tight bond between the core units and the connectors, effectively reducing the risk of deformation and cracking of the rotor assembly, thus meeting the requirements for high-speed operation.

[0018] An electrical device according to a third aspect of the present invention includes a motor according to a second aspect of the present invention.

[0019] The electrical device according to a third aspect embodiment of the present invention has at least the following beneficial effects: Because the electrical device uses the aforementioned motor, by providing a connector that connects to multiple iron core units, and by mutually constraining the connector and the iron core units radially in the rotor assembly, the multiple iron core units are connected as a whole. Simultaneously, the connector is provided with a first limiting portion abutting against the end face of one axial end of the iron core unit, which enables mutual axial positioning between the connector and the iron core unit, enhancing the bonding strength between the connector and the rotor core, thereby strengthening the overall structural strength of the rotor assembly. When the rotor assembly operates at high speed, the connector can apply a force to the iron core unit to counteract centrifugal force, ensuring a tight bond between the iron core unit and the connector, effectively reducing the risk of deformation and cracking of the rotor assembly, thus meeting the requirements of high-speed operation.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the rotor assembly in an embodiment of the present invention; Figure 2 This is an axial sectional view of the rotor assembly in an embodiment of the present invention; Figure 3 This is a front view rotated sectional view of the rotor assembly in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the connector cooperating with the rotor core and shaft in an embodiment of the present invention; Figure 5This is an axial sectional view of the connection between the connector and the rotor core and shaft in an embodiment of the present invention; Figure 6 This is an axial view of the connector in an embodiment of the present invention; Figure 7 This is a schematic diagram of the connector structure in an embodiment of the present invention; Figure 8 This is an axial view of the core unit in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the plastic-coated body in another embodiment of the present invention.

[0022] Figure label: Connector 100; Body 110; Groove 111; Positioning part 112; Through hole 113; Connecting part 120; Extension part 121; Second limiting part 122; First limiting part 130; Rotor core 200; Core unit 210; Limiting groove 211; Material passage hole 212; Mounting groove 220; 300mm plastic coating; Permanent magnet 400; 500 shaft. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0025] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of this invention, unless otherwise explicitly defined, terms such as setting, installing, connecting, assembling, and cooperating should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0027] Reference Figures 1 to 9 As shown, a first aspect of the present invention provides a rotor assembly applied in a motor of an electrical device, such as a washing machine, dryer, or dishwasher. Typically, the motor also includes a stator assembly, and the rotor assembly is rotatably disposed within the inner bore of the stator assembly and is capable of rotating relative to the stator assembly.

[0028] The following section uses the motor in a washing machine as an example to describe the specific structure of the motor rotor assembly in detail. Of course, the rotor assembly of this embodiment is also applicable to the motors of other electrical appliances such as dryers and dishwashers. Reference Figure 1 and Figure 2 As shown, it can be understood that the rotor assembly includes a rotor core 200, multiple permanent magnets 400, and a plastic-coated body 300.

[0029] The direction of the rotation axis of the rotor assembly is defined as the axial direction of the rotor assembly. The direction around the rotation axis of the rotor assembly is the circumferential direction. The direction perpendicular to the rotation axis of the rotor assembly and pointing from the rotation axis to the outer periphery of the rotor assembly, and its reverse direction, are defined as the radial direction of the rotor assembly. Along the radial direction of the rotor assembly, the side closer to the rotation axis of the rotor assembly is called the inner side, and the side farther away from the rotation axis of the rotor assembly is called the outer side.

[0030] Reference Figure 4 and Figure 5 The rotor core 200 comprises multiple core units 210, which are not directly connected to each other, i.e., the rotor core 200 has a split structure. The outer contour of the core unit 210 is roughly fan-shaped, and the multiple core units 210 are arranged at equal intervals along the circumference of the rotor assembly, i.e., the multiple core units 210 are arranged in a ring, and mounting slots 220 are defined between adjacent core units 210. The number of mounting slots 220 is equal to the number of core units 210.

[0031] Continue to refer to Figure 2The number of permanent magnets 400 is equal to the number of mounting slots 220. Multiple permanent magnets 400 are installed in multiple mounting slots 220, meaning that the permanent magnets 400 are installed between two adjacent core units 210. Along the circumference of the rotor assembly, multiple core units 210 and multiple permanent magnets 400 are arranged alternately. In this embodiment, the number of core units 210 and permanent magnets 400 is eight. Of course, the number of core units 210 and permanent magnets 400 can also be ten, twelve, or more; no specific limitation is made here.

[0032] Continue to refer to Figure 1 and Figure 2 To integrate the core unit 210 and the permanent magnet 400 into a single unit, a plastic coating 300 covers the rotor core 200 and the multiple permanent magnets 400; that is, the plastic coating 300 covers the multiple core units 210 and the multiple permanent magnets 400. Specifically, the plastic coating 300 covers a portion of the structure of the two axially opposed end faces of the core unit 210 along the rotor assembly, the two radially opposed wall faces of the core unit 210 along the rotor assembly, the two axially opposed end faces of the permanent magnets 400 along the rotor assembly, and the two radially opposed wall faces of the permanent magnets 400 along the rotor assembly. Thus, by integrating the multiple core units 210 and the multiple permanent magnets 400 into a single unit through the plastic coating 300, the overall structural strength and stability of the rotor assembly are improved.

[0033] Reference Figure 1 , Figure 2 and Figure 4 To improve the bonding strength between the plastic coating 300 and the rotor core 200, the core unit 210 is typically provided with a feed hole 212. The feed hole 212 extends along the axial direction of the rotor assembly through two opposite end faces of the core unit 210. Part of the plastic coating 300 fills the feed hole 212. This increases the constraint between the plastic coating 300 and the core unit 210, which is beneficial for further improving the structural strength and stability of the rotor assembly.

[0034] It is easy to understand that the plastic-coated body 300 is coated onto the rotor core 200 and the permanent magnet 400 through injection molding.

[0035] In related technologies, when a magnetic bridge exists in the rotor core 200 connecting two adjacent core units 210, although it can improve the structural strength of the rotor core 200, the magnetic bridge will increase leakage flux, leading to a decrease in the utilization rate of the permanent magnet 400 and affecting the performance of the motor. Therefore, some solutions adopt a segmented rotor core 200 structure, where the multiple core units 210 of the rotor core 200 are arranged in blocks, and there is no magnetic bridge between two adjacent core units 210, thereby reducing leakage flux and improving motor performance.

[0036] However, for washing machine motors, the motor speed is relatively high during spin-drying. When the motor operates at high speed, the rotor assembly, which uses a segmented rotor core 200, is at risk of deformation and cracking under centrifugal force. That is, relying solely on the limiting effect of the plastic-coated body 300, under centrifugal force, the core unit 210 and the permanent magnet 400 may cause the plastic-coated body 300 to deform and crack, leading to loosening or even detachment of the core unit 210 and the permanent magnet 400 from the plastic-coated body 300. The structural strength of the rotor assembly is insufficient to meet the demands of high speed, severely affecting motor operation and posing a safety hazard.

[0037] Therefore, referring to Figure 4 and Figure 5 As shown, the rotor assembly also includes a connector 100, which comprises a body portion 110 and a plurality of connecting portions 120. The body portion 110 is generally annular in shape, and the plurality of connecting portions 120 are all connected to the outer peripheral wall of the body portion 110 and extend outward along the radial direction of the body portion 110. The plurality of connecting portions 120 are arranged at equal intervals along the circumference of the body portion 110. The radial direction of the body portion 110 is the radial direction of the rotor assembly, and the circumference of the body portion 110 is the circumference of the rotor assembly.

[0038] Continue to refer to Figure 4 and Figure 5 The main body 110 of the connector 100 is located within the space surrounded by multiple core units 210, and multiple connecting portions 120 of the connector 100 extend correspondingly to the multiple core units 210. At this time, the multiple core units 210 are arranged at intervals along the direction surrounding the connector 100. The number of connecting portions 120 is equal to the number of core units 210. The multiple connecting portions 120 are correspondingly connected to the multiple core units 210, and the core units 210 and their corresponding connecting portions 120 are mutually constrained in the radial direction of the rotor assembly. That is, the core units 210 cannot detach from the connector 100 radially outward along the rotor assembly. The connecting portions 120 and the core units 210 can be connected by a dovetail structure, a T-shaped structure, or other structures, as long as the connecting portions 120 and the core units 210 are mutually constrained in the radial direction of the rotor assembly.

[0039] Therefore, by providing the connector 100, multiple core units 210 are connected to the connector 100 as a whole, which helps to improve the structural strength and stability of the rotor core 200. Furthermore, when the rotor assembly rotates, the connector 120 can apply a tensile force to the core unit 210 in the opposite direction to the centrifugal force, and the magnitude of the tensile force is equal to the centrifugal force. Thus, the tensile force applied by the connector 120 to the core unit 210 cancels out the centrifugal force, preventing the core unit 210 from undergoing radial displacement relative to the connector 100 due to centrifugal force. Even when the rotor assembly rotates at high speed, it can prevent the core unit 210 from detaching from the connector 100, thereby improving the structural strength and stability of the rotor assembly and enhancing the rotational reliability of the rotor assembly.

[0040] The connector 100 can be made of a non-magnetic material, such as plastic or stainless steel, which effectively reduces magnetic leakage. In this embodiment, the connector 100 is a plastic part, and the material of the connector 100 can be the same as or different from the material of the plastic-coated body 300. The connector 100 can be connected to the rotor core 200 through injection molding, which simplifies the manufacturing process.

[0041] Reference Figures 4 to 6 It is understood that the rotor assembly also includes a shaft 500, and a through hole 113 is provided in the middle of the body portion 110. The shaft 500 passes through the through hole 113 and is fixedly connected to the body portion 110. In this example, the connector 100 is a plastic part, the body portion 110 wraps around the outer periphery of the shaft 500, and the body portion 110 is fixedly connected to the shaft 500, that is, the shaft 500 cannot move or rotate relative to the body portion 110. Therefore, multiple core units 210, shafts 500, and connectors 100 are connected into a whole, which helps to improve the structural strength of the rotor assembly.

[0042] Reference Figures 3 to 5 As shown, it can be understood that the connector 100 also includes a first limiting portion 130. At least one end of the connecting portion 120 along the axial direction of the rotor assembly is connected to the first limiting portion 130. The first limiting portion 130 protrudes from the end of the core unit 210 along the axial direction of the rotor assembly and abuts against the end face of the core unit 210 corresponding to the connecting portion 120 along the axial direction of the rotor assembly. Therefore, the first limiting portion 130 and the corresponding core unit 210 form a constraint in at least one direction of the axial direction of the rotor assembly.

[0043] Reference Figure 3Specifically, in this embodiment, each connecting portion 120 is connected to a first limiting portion 130 at both ends along the axial direction of the rotor assembly, and the first limiting portion 130 is located at the end of the connecting portion 120 opposite to the body portion 110. In each connecting portion 120, the first limiting portions 130 at both ends respectively abut against the two end faces of the corresponding core unit 210 opposite to each other along the axial direction of the rotor assembly. Therefore, under the limiting action of the two first limiting portions 130, the corresponding core unit 210 and the connecting member 100 form a constraint in the axial direction of the rotor assembly, which helps to improve the bonding strength between the connecting member 100 and the corresponding core unit 210 and avoids axial displacement of the core unit 210 relative to the connecting member 100. That is to say, in this embodiment, all core units 210 and connecting members 100 form a constraint in the axial direction of the rotor assembly, effectively preventing all core units 210 from axially displacing relative to the connecting member 100. Therefore, it can effectively improve the bonding strength between the connector 100 and the rotor core 200, and further improve the structural strength and structural stability of the rotor assembly.

[0044] Of course, in other embodiments, only a portion of the connecting parts 120 is connected to a first limiting part 130 at one end along the axial direction of the rotor assembly. For example, all connecting parts 120 are connected to a first limiting part 130 at the same end along the axial direction of the rotor assembly, thus constraining the rotor core 200 and the connector 100 in one direction along the axial direction of the rotor assembly; or, only a portion of the connecting parts 120 are connected to a first limiting part 130 at both ends along the axial direction of the rotor assembly, thus constraining a portion of the core unit 210 and the connector 100 in the axial direction of the rotor assembly; or, a portion of the connecting parts 120 are connected to a first limiting part 130 at one end along the axial direction of the rotor assembly, and another portion of the connecting parts 120 are connected to a first limiting part 130 at the other end along the axial direction of the rotor assembly, thus constraining a portion of the core unit 210 and the connector 100 in one direction along the axial direction of the rotor assembly, and constraining another portion of the core unit 210 and the connector 100 in the other direction along the axial direction of the rotor assembly, and so on. The above embodiments can effectively improve the bonding strength between the connector 100 and the rotor core 200. These are only some embodiments, and not all embodiments will be described here. Therefore, by providing the first limiting part 130, the bonding strength between the connector 100 and the rotor core 200 can be effectively improved, further enhancing the structural strength and stability of the rotor assembly.

[0045] Reference Figure 1 and Figure 2It is understandable that the plastic coating 300 also covers the connector 100. Specifically, the plastic coating 300 covers the two opposite walls of the connector 120 along the axial direction of the rotor assembly, the first limiting part 130, and the two opposite walls of the body part 110 along the axial direction of the rotor assembly. Therefore, the rotor core 200, connector 100, shaft 500, multiple permanent magnets 400, and plastic coating 300 are formed into a whole, effectively improving the overall structural strength of the rotor assembly.

[0046] Reference Figure 9 In other embodiments, the plastic-coated body 300 has multiple recesses on two end faces that are opposite to each other along the axial direction of the rotor assembly. It is only necessary to ensure that the plastic-coated body 300 covers the core unit 210, the permanent magnet 400 and the connector 100, which is beneficial for weight reduction and reducing the amount of plastic used, thus reducing costs.

[0047] Therefore, by providing a connector 100 connected to multiple core units 210, and by mutually constraining the connector 100 and the core units 210 in the radial direction of the rotor assembly, the multiple core units 210 are connected into a whole. Simultaneously, the connector 100 is provided with a first limiting portion 130 abutting against the end face of one axial end of the core unit 210, which enables the connector 100 and the core unit 210 to mutually limit each other in the axial direction, enhancing the bonding strength between the connector 100 and the rotor core 200, thereby strengthening the overall structural strength of the rotor assembly. When the rotor assembly operates at high speed, the connector 100 can apply a tensile force to the core unit 210 to counteract centrifugal force, ensuring a tight bond between the core unit 210 and the connector 100, effectively reducing the risk of deformation and cracking of the rotor assembly, i.e., reducing the risk of deformation and cracking of the plastic coating 300, thus meeting the requirements of high-speed operation. It is suitable for use in washing machine motors and can meet the requirements of high-speed operation under spin-drying conditions. It also effectively improves safety.

[0048] It is easy to understand that the rotor assembly of this embodiment, due to its high structural strength, can be used in motors with high-speed operating conditions, and of course, it can also be used in motors without high-speed operating conditions, such as dishwasher motors, dryer motors, etc. No specific limitation is made here on the applicable equipment of the rotor assembly.

[0049] It is easy to understand that in the process of producing rotor components, multiple iron core units 210 and rotating shaft 500 are first positioned by molds. Molten plastic is injected into the mold through injection molding process. After the plastic cools, it forms a connector 100, which connects the connector 100 to the multiple iron core units 210 and is wrapped in plastic around the outer periphery of the rotating shaft 500. The connector 100, the multiple iron core units 210 and the rotating shaft 500 form a whole. Then, multiple permanent magnets 400 are inserted into multiple mounting slots 220 of the whole consisting of connector 100, multiple iron core units 210 and rotating shaft 500, and positioned by another mold. Then, molten plastic is injected into the mold by injection molding process. After the plastic cools, it forms a plastic-coated body 300, which encapsulates connector 100, rotor iron core 200 and multiple permanent magnets 400. Thus, plastic-coated body 300, connector 100, rotor iron core 200, multiple permanent magnets 400 and rotating shaft 500 form a whole, namely rotor assembly, which has the advantages of high structural strength and good structural stability.

[0050] Reference Figure 6 and Figure 7 As shown, it can be understood that the first limiting portion 130 is connected to the end face of the connecting portion 120 along the axial direction of the rotor assembly. The maximum distance between the two ends of the first limiting portion 130 along the circumferential direction of the rotor assembly is greater than the maximum distance between the two ends of the connecting portion 120 along the circumferential direction of the rotor assembly. The maximum distance between the two ends of the first limiting portion 130 along the circumferential direction of the rotor assembly can be understood as the maximum width of the first limiting portion 130. Similarly, the maximum distance between the two ends of the connecting portion 120 along the circumferential direction of the rotor assembly can be understood as the maximum width of the connecting portion 120. That is to say, in the circumferential direction of the rotor assembly, the maximum width of the first limiting portion 130 is greater than the maximum width of the connecting portion 120. Therefore, the first limiting part 130 can protrude from the side wall of the connecting part 120 along the circumference of the rotor assembly, and the structure of the first limiting part 130 protruding from the connecting part 120 abuts against the end face of the corresponding iron core unit 210, which is beneficial to increase the contact area between the first limiting part 130 and the corresponding iron core unit 210, enhance the limiting effect, thereby improve the bonding strength between the connecting member 100 and the corresponding iron core unit 210, and improve the structural strength of the rotor assembly.

[0051] Reference Figure 6 and Figure 7As shown, it can be understood that both ends of the first limiting portion 130 protrude from both ends of the connecting portion 120 along the circumference of the rotor assembly, that is, the first limiting portion 130 protrudes from the two side walls of the connecting portion 120 along the circumference of the rotor assembly. Generally speaking, the connecting portion 120 is connected to the corresponding iron core unit 210 at the middle position along the circumference of the rotor assembly. Therefore, the first limiting portion 130 can form a limiting relationship with the corresponding iron core unit 210 on both sides of the connecting portion 120. The limiting effect between the first limiting portion 130 and the iron core unit 210 is more stable and balanced, effectively preventing the iron core unit 210 from axially displacing relative to the connecting member 100, and improving the structural strength and structural stability of the rotor assembly.

[0052] Reference Figure 6 and Figure 7 As shown, it can be understood that the first limiting portion 130 protrudes radially outward from the end of the connecting portion 120 along the rotor assembly, and the structure of the first limiting portion 130 protruding from the connecting portion 120 abuts against the end face of the corresponding core unit 210. Therefore, the contact area between the first limiting portion 130 and the corresponding core unit 210 can be further increased, enhancing the limiting effect, thereby improving the bonding strength between the connecting member 100 and the corresponding core unit 210, which is beneficial to improving the structural strength of the rotor assembly.

[0053] Reference Figure 2 and Figure 6 As shown, it can be understood that the body portion 110 is provided with a plurality of grooves 111, which are provided on the outer peripheral wall of the body portion 110 and recessed inward along the radial direction of the rotor assembly. Generally, the grooves 111 penetrate two end faces of the body portion 110 that are opposite to each other along the axial direction of the rotor assembly. The number of grooves 111 is equal to the number of connecting portions 120, with one groove 111 between every two adjacent connecting portions 120. At the same time, between two adjacent connecting portions 120, two positioning portions 112 are formed on the outer peripheral wall of the body portion 110, respectively located on both sides of the grooves 111 along the circumferential direction of the rotor assembly. The positioning portions 112 may be provided to protrude outward along the radial direction of the rotor assembly relative to the outer peripheral wall of the body portion 110, or they may be a part of the outer peripheral wall of the body portion 110. One end of the permanent magnet 400 near the rotation axis of the rotor assembly abuts against the two positioning parts 112, or a portion of the structure of the plastic-coated body 300 is filled between the end of the permanent magnet 400 near the rotation axis of the rotor assembly and the positioning part 112, thereby realizing the radial positioning of the permanent magnet 400 in the rotor assembly by the positioning part 112, and improving the installation stability of the permanent magnet 400.

[0054] A portion of the plastic-coated body 300 fills the groove 111 to enhance the bonding strength between the plastic-coated body 300, the permanent magnet 400, and the connector 100. Compared to a scheme where two grooves 111 are located on either side of the positioning portion 112 along the circumference of the rotor assembly, this embodiment increases the cross-sectional area of ​​a single groove 111 by placing the groove 111 between the two positioning portions 112, thus increasing the flow area of ​​the groove 111. The cross-sectional area is the area on a section perpendicular to the rotation axis of the rotor assembly.

[0055] Because the stress is relatively high near the outer periphery of the connector 100 in the rotor assembly, that is, the stress is relatively high in the structure of the second plastic-coated body 300 at the groove 111, the molten plastic can quickly pass through the groove 111 with a large flow area during injection molding of the plastic-coated body 300, avoiding the formation of weld lines in the groove 111. This reduces the risk of cracking of the plastic-coated body 300 at the groove 111, improves the structural stability of the plastic-coated body 300, and thus improves the structural strength of the rotor assembly.

[0056] Reference Figure 6 As shown, it can be understood that the maximum radial depth of the groove 111 is D, satisfying: 1.5mm ≤ D ≤ 3mm. The maximum radial depth of the groove 111 is the maximum distance in the radial direction between the groove wall of the groove 111 and the radially outward wall of the positioning part 112 on the rotor assembly. Making D ≥ 1.5mm ensures that the flow area of ​​the groove 111 is large enough so that the molten plastic can quickly pass through the groove 111, avoiding the formation of weld lines in the groove 111 and improving the structural stability of the plastic coating 300; making D ≤ 3mm avoids the disadvantage of the groove 111 being too large, which would lead to a decrease in the structural strength of the body part 110. Therefore, making 1.5mm ≤ D ≤ 3mm, while ensuring that the structural strength of the connector 100 meets the requirements, increases the flow area of ​​the groove 111 so that the molten plastic can quickly pass through the groove 111, avoiding the formation of weld lines in the groove 111, improving the structural stability of the plastic coating 300, and thus improving the structural strength of the rotor assembly.

[0057] Reference Figure 7 and Figure 8As shown, the connecting portion 120 includes an extension portion 121 and a second limiting portion 122. Specifically, the extension portion 121 is elongated and arranged radially along the rotor assembly. One end of the extension portion 121 near the rotation axis of the rotor assembly is connected to the outer peripheral wall of the body portion 110, and the other end of the extension portion 121 away from the rotation axis of the rotor assembly extends radially outward along the rotor assembly. The second limiting portion 122 is connected to the end of the extension portion 121 away from the body portion 110. The maximum distance between the two ends of the second limiting portion 122 along the circumferential direction of the rotor assembly is greater than the maximum distance between the two ends of the extension portion 121 along the circumferential direction of the rotor assembly. The maximum distance between the two ends of the second limiting part 122 along the circumference of the rotor assembly can be understood as the maximum width of the second limiting part 122. Similarly, the maximum distance between the two ends of the extension part 121 along the circumference of the rotor assembly can be understood as the maximum width of the extension part 121. That is, the maximum width of the second limiting part 122 is greater than the maximum width of the extension part 121, so that the second limiting part 122 protrudes from the side wall of the extension part 121 along the circumference of the rotor assembly. The combination of the extension part 121 and the second limiting part 122 can be an L-shaped structure, a T-shaped structure, a dovetail structure, etc. Correspondingly, the core unit 210 is provided with a limiting groove 211. The limiting groove 211 passes through two end faces of the core unit 210 that are opposite to each other along the axial direction of the rotor assembly. The opening of the limiting groove 211 faces the rotation axis of the rotor assembly. The inner contour of the limiting groove 211 is the same as part of the outer contour of the connecting part 120. The second limiting part 122 and part of the extension part 121 are accommodated in the limiting groove 211. Alternatively, the second limiting part 122 and the entire extension 121 can be accommodated in the limiting groove 211. Therefore, with the cooperation of the second limiting part 122 and the limiting groove 211, the connector 100 and the core unit 210 can be mutually constrained in the radial direction of the rotor assembly, which is beneficial to the combination of the core unit 210 and the connector 100, thereby improving the structural strength and structural stability of the rotor assembly.

[0058] It is easy to understand that the maximum width of the connecting part 120 is the same as the maximum width of the second limiting part 122.

[0059] Reference Figure 2 and Figure 7 As shown, it can be understood that the two ends of the second limiting portion 122 protrude from the two opposing walls of the extension portion 121 along the circumference of the rotor assembly. That is, the connecting portion 120 is approximately T-shaped. Therefore, the second limiting portion 122 can mutually constrain the core unit 210 on both sides of the extension portion 121 along the circumference of the rotor assembly, resulting in a more balanced force, which is beneficial to improving the connection stability between the connecting portion 120 and the core unit 210, thereby improving the bonding strength between the core unit 210 and the connector 100, and further improving the structural strength and structural stability of the rotor assembly.

[0060] The motor of the second aspect of the present invention includes a stator assembly and a rotor assembly of the first aspect of the present invention, wherein the rotor assembly is rotatably disposed in the inner hole of the stator assembly and is rotatable relative to the stator assembly.

[0061] Since the motor adopts all the technical solutions of the rotor assembly of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0062] The electrical device according to the third aspect of the present invention includes the motor according to the second aspect of the present invention. The electrical device here may be a washing machine, dryer, dishwasher, etc., which will not be described in detail here.

[0063] Since the electrical equipment adopts all the technical solutions of the motor in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments.

[0064] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A rotor assembly, characterized in that, include: A connector includes a body portion and a plurality of connecting portions, wherein the plurality of connecting portions are connected to the body portion and are arranged at intervals along the circumferential direction of the body portion; The rotor core includes a plurality of core units, which are spaced apart along the direction surrounding the connector. The plurality of core units are correspondingly connected to a plurality of connectors, and the core units and the connectors are mutually constrained in the radial direction of the rotor assembly. The connector further includes a first limiting part, at least one end of the connector along the axial direction of the rotor assembly is connected to the first limiting part, the first limiting part protrudes from the end of the core unit along the axial direction and abuts against the end face of the core unit along the axial direction.

2. The rotor assembly according to claim 1, characterized in that: The maximum distance between the two ends of the first limiting portion along the circumferential direction is greater than the maximum distance between the two ends of the connecting portion along the circumferential direction.

3. The rotor assembly according to claim 2, characterized in that: Along the circumferential direction, the two ends of the first limiting portion protrude from the two ends of the connecting portion, respectively.

4. The rotor assembly according to claim 1, characterized in that: The first limiting portion is located at one end of the connecting portion away from the main body portion, and the first limiting portion protrudes outward from the end of the connecting portion along the radial direction.

5. The rotor assembly according to claim 1, characterized in that: The main body is provided with a plurality of grooves, with one groove between each two adjacent connecting parts. The grooves are recessed inward along the radial direction. The main body also includes positioning parts located on both sides of the grooves along the circumferential direction. The positioning parts are used to position the permanent magnet.

6. The rotor assembly according to claim 5, characterized in that: The maximum depth of the groove along the radial direction is D, which satisfies: 1.5mm≤D≤3mm.

7. The rotor assembly according to claim 1, characterized in that: The connecting portion includes an extension portion and a second limiting portion. One end of the extension portion is connected to the outer peripheral wall of the main body portion, and the other end extends outward along the radial direction. The second limiting portion is connected to one end of the extension portion away from the main body portion. The maximum distance between the two ends of the second limiting portion along the circumferential direction is greater than the maximum distance between the two ends of the extension portion along the circumferential direction. The core unit is provided with a limiting groove to accommodate the second limiting portion and at least part of the extension portion.

8. The rotor assembly according to claim 7, characterized in that: The second limiting portion protrudes from the two wall surfaces of the extension portion that are opposite to each other along the circumferential direction at both ends.

9. The rotor assembly according to claim 1, characterized in that: The rotor assembly also includes a plastic-coated body and a plurality of permanent magnets. An installation slot is provided between two adjacent core units, and the plurality of permanent magnets are installed in the plurality of installation slots. The plastic-coated body covers the connector, the rotor core and the plurality of permanent magnets.

10. The rotor assembly according to claim 1, characterized in that: The rotor assembly also includes a rotating shaft, and the body portion has a through hole, through which the rotating shaft passes and is fixedly connected to the body portion.

11. An electric motor, characterized in that, Includes the rotor assembly as described in any one of claims 1 to 10.

12. Electrical equipment, characterized in that, Includes the motor as described in claim 11.

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