Rotor assembly, motor and electrical equipment

Abstract

The utility model discloses a rotor assembly, motor and electrical equipment, the rotor assembly comprises a first plastic-coated body, a rotor core and a plurality of permanent magnets, the first plastic-coated body comprises a body part, a plurality of connecting parts, a first limiting part and a plurality of second limiting parts, the plurality of connecting parts are connected with the body part and are arranged at intervals along the circumferential direction of the body part, and the plurality of second limiting parts are arranged at intervals along the circumferential direction of the body part. At least one end, in the axial direction of the rotor assembly, of at least one connecting part is connected with a first limiting part; the rotor iron core comprises a plurality of iron core units, the plurality of iron core units are arranged at intervals along the direction around the first plastic-coated body, the plurality of iron core units are correspondingly connected to the plurality of connecting parts, and the iron core units and the connecting parts are mutually restrained in the radial direction of the rotor assembly; wherein the first limiting part abuts against the end face of one end, in the axial direction, of the iron core unit, and the multiple second limiting parts located at the same end abut against the end faces of the ends, in the axial direction, of the multiple permanent magnets correspondingly. The rotor assembly is high in structural strength and convenient to assemble.

Description

Technical Field

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

[0002] In related technologies, the rotor core of the motor adopts a segmented structure. By reducing the number of magnetic bridges, leakage flux is reduced, thereby improving the utilization rate of permanent magnets and enhancing motor performance. To improve the structural strength of the rotor core and prevent risks such as deformation and cracking during high-speed operation, non-magnetic components are used to connect the segmented rotor core. However, when installing permanent magnets, it is difficult to insert them into the rotor core, leading to increased assembly difficulty and decreased efficiency. Utility Model Content

[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 and convenient assembly.

[0004] This utility model also provides a motor and electrical equipment having the above-mentioned rotor assembly.

[0005] A rotor assembly according to a first aspect of the present invention includes a first plastic-coated body, comprising a main body, a plurality of connecting portions, and a first limiting portion. The plurality of connecting portions are connected to the main body and arranged at intervals along the circumferential direction of the main body. At least one of the connecting portions is connected to at least one end of the rotor assembly along the axial direction of the first limiting portion. The first plastic-coated body further includes a plurality of second limiting portions located at at least one end along the axial direction, and the plurality of second limiting portions located at the same end are arranged at intervals along the circumferential direction. A rotor core includes a plurality of core units, and the plurality of core units are arranged around the rotor assembly. The first plastic-coated body is arranged at directional intervals, and multiple iron core units are correspondingly connected to multiple connecting parts. The iron core units and the connecting parts are mutually constrained in the radial direction of the rotor assembly. An installation groove is provided between two adjacent iron core units. Multiple permanent magnets are correspondingly installed in the multiple installation grooves. The first limiting part protrudes from the end of the iron core unit along the axial direction and abuts against the end face of the iron core unit along the axial direction. Multiple second limiting parts located at the same end abut against the end faces of multiple permanent magnets along the axial direction.

[0006] The rotor assembly according to the first aspect of this utility model has at least the following beneficial effects: A first plastic-coated body is connected to multiple iron core units via multiple connecting portions, and the iron core units are axially limited by a first limiting portion. Multiple second limiting portions axially limit multiple permanent magnets mounted in the mounting slots of the rotor iron core, thereby combining the first plastic-coated body with the multiple iron core units and the multiple permanent magnets, which helps to improve the overall structural strength of the rotor assembly. Simultaneously, during assembly, the multiple iron core units and multiple permanent magnets can be alternately arranged and assembled circumferentially first, and then the first plastic-coated body can be combined with the multiple iron core units and multiple permanent magnets through injection molding, thus eliminating the subsequent step of inserting the permanent magnets into the mounting slots of the rotor iron core, simplifying the assembly process, reducing assembly difficulty, and thereby improving production efficiency.

[0007] According to some embodiments of the present invention, the maximum distance between the two ends of the second limiting portion along the circumferential direction is greater than or equal to the maximum distance between the two ends of the permanent magnet along the circumferential direction.

[0008] According to some embodiments of the present invention, along the circumferential direction, the two ends of the second limiting portion protrude from the two ends of the permanent magnet, and the part of the second limiting portion protruding from the permanent magnet abuts against the end face of one end of the core unit along the axial direction.

[0009] According to some embodiments of the present invention, when the first plastic-coated body is provided with a plurality of second limiting portions at both ends along the axial direction, and two corresponding second limiting portions along the axial direction respectively abut against the end faces of the permanent magnet at both ends along the axial direction, the first plastic-coated body further includes a plurality of third limiting portions, the plurality of third limiting portions respectively correspondingly connected between two corresponding second limiting portions along the axial direction, and the third limiting portions abut against the side wall of the permanent magnet away from the main body.

[0010] According to some embodiments of the present invention, the core unit is provided with a first positioning part and a second positioning part at both ends along the radial direction, and the first positioning part and the second positioning part respectively abut against the two end faces of the permanent magnet that are opposite to each other along the radial direction.

[0011] According to some embodiments of the present invention, 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.

[0012] According to some embodiments of the present invention, the connecting portion includes an extension portion and a fourth 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 fourth 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 fourth 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 fourth limiting portion and at least part of the extension portion.

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

[0014] According to some embodiments of the present invention, the main body is provided with a plurality of grooves, and there is one groove between each two adjacent connecting parts. The grooves are recessed inward along the radial direction. The main body also includes a third positioning part located on both sides of the grooves along the circumferential direction. The third positioning part is used to position the permanent magnet.

[0015] 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.

[0016] According to some embodiments of the present invention, the rotor assembly further includes a rotating shaft, and the first plastic-coated body covers the outer periphery of the rotating shaft and is fixedly connected to the rotating shaft.

[0017] According to some embodiments of the present invention, the rotor assembly further includes a second plastic-coated body, which covers the first plastic-coated body, the rotor core, and the plurality of permanent magnets.

[0018] The motor according to a second aspect embodiment of the present invention includes the rotor assembly of the first aspect embodiment of the present invention.

[0019] The motor according to the second aspect embodiment of this utility model has at least the following beneficial effects: Since the motor adopts the aforementioned rotor assembly, the first plastic-coated body is connected to multiple iron core units through multiple connecting parts, and the iron core units are axially limited by the first limiting part. Multiple second limiting parts axially limit the multiple permanent magnets installed in the mounting slots of the rotor iron core, thereby combining the first plastic-coated body with the multiple iron core units and the multiple permanent magnets, which is beneficial to improving the overall structural strength of the rotor assembly. Simultaneously, during assembly, the multiple iron core units and multiple permanent magnets can be alternately arranged and assembled circumferentially first, and then the first plastic-coated body can be combined with the multiple iron core units and multiple permanent magnets through injection molding, thereby eliminating the subsequent step of inserting the permanent magnets into the mounting slots of the rotor iron core, simplifying the assembly process, reducing assembly difficulty, and thus improving production efficiency.

[0020] The electrical equipment according to the third aspect of the present invention includes the motor according to the second aspect of the present invention.

[0021] The electrical device according to the third aspect of this utility model has at least the following beneficial effects: Since the electrical device uses the aforementioned motor, the first plastic-coated body is connected to multiple iron core units through multiple connecting parts, and the iron core units are axially limited by the first limiting part. Multiple second limiting parts axially limit the multiple permanent magnets installed in the mounting slots of the rotor iron core, thereby combining the first plastic-coated body with the multiple iron core units and the multiple permanent magnets, which helps to improve the overall structural strength of the rotor assembly. Simultaneously, during assembly, the multiple iron core units and multiple permanent magnets can be alternately arranged and assembled circumferentially first, and then the first plastic-coated body can be combined with the multiple iron core units and multiple permanent magnets through injection molding, thereby eliminating the subsequent step of inserting the permanent magnets into the mounting slots of the rotor iron core, simplifying the assembly process, reducing assembly difficulty, and thus improving production efficiency.

[0022] Additional aspects and advantages of this 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

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram of the rotor assembly in an embodiment of the present invention;

[0025] Figure 2 This is an axial cross-sectional view of the rotor assembly in an embodiment of the present invention (with one of the permanent magnets hidden).

[0026] Figure 3 This is a front view rotated sectional view of the rotor assembly in an embodiment of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the first plastic body assembled with the rotor core, the shaft, and multiple permanent magnets in this embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the structure of the first plastic-coated body in an embodiment of this utility model;

[0029] Figure 6 This is an axial sectional view of the first plastic-coated body in an embodiment of this utility model;

[0030] Figure 7 This is a schematic diagram of the core unit in an embodiment of this utility model.

[0031] Figure label:

[0032] First plastic body 100; main body 110; groove 111; third positioning part 112; through hole 113; connecting part 120; extension part 121; fourth limiting part 122; first limiting part 130; second limiting part 140; third limiting part 150;

[0033] Rotor core 200; core unit 210; limiting groove 211; material passage hole 212; mounting groove 220; first positioning part 230; second positioning part 240;

[0034] Permanent magnet 300;

[0035] 400mm pivot;

[0036] The second package contains 500 plastic parts. Detailed Implementation

[0037] The following describes embodiments of the present invention in detail. Examples of the embodiments 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 only to explain the present invention and are not to be construed as limiting the present invention.

[0038] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 limitations on this utility model.

[0039] In the description of this utility model, "several" means one or more, "multiple" 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. If "first" or "second" is used in the description, it is only for the purpose of 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.

[0040] In the description of this utility model, 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 utility model in conjunction with the specific content of the technical solution.

[0041] Reference Figures 1 to 7As shown, the first aspect of this utility model provides a rotor assembly applied in the 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 hole of the stator assembly and is capable of rotating relative to the stator assembly.

[0042] 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.

[0043] Reference Figure 1 and Figure 2 As shown, it can be understood that the rotor assembly includes a rotor core 200, multiple permanent magnets 300 and a first plastic body 100.

[0044] 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.

[0045] Continue to refer to Figure 2 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 segmented structure. The outer contour of each 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.

[0046] Continue to refer to Figure 2 The number of permanent magnets 300 is equal to the number of mounting slots 220. Multiple permanent magnets 300 are installed in multiple mounting slots 220, meaning that the permanent magnets 300 are installed between two adjacent core units 210. Along the circumference of the rotor assembly, multiple core units 210 and multiple permanent magnets 300 are arranged alternately. In this embodiment, the number of core units 210 and permanent magnets 300 is eight. Of course, the number of core units 210 and permanent magnets 300 can also be ten, twelve, or more; no specific limit is placed on the number of core units 210 and permanent magnets 300 here.

[0047] Reference Figure 2 and Figure 7As shown, it can be understood that the core unit 210 has a first positioning part 230 and a second positioning part 240 respectively provided at both ends of the rotor assembly along the radial direction. The first positioning part 230 is located at the outer end of the core unit 210, and the second positioning part 240 is located at the inner end of the core unit 210. In this embodiment, the core unit 210 has a first positioning part 230 and a second positioning part 240 provided on both sides of the rotor assembly along the circumference. The first positioning parts 230 on both sides protrude from two opposing walls of the core unit 210 along the circumference of the rotor assembly, and the second positioning parts 240 on both sides protrude from two opposing walls of the core unit 210 along the circumference of the rotor assembly. The second positioning part 240 located on one side of the core unit 210 along the circumference of the rotor assembly consists of three single-unit structures arranged at equal intervals along the axial direction of the rotor assembly. When the permanent magnet 300 is installed in the mounting groove 220, the first positioning part 230 and the second positioning part 240 respectively abut against two wall surfaces of the permanent magnet 300 that are opposite to each other along the radial direction of the rotor assembly, thereby achieving the positioning of the permanent magnet 300 in the radial direction of the rotor assembly.

[0048] Reference Figure 5 As shown, it can be understood that the first plastic body 100 includes a body portion 110 and a plurality of connecting portions 120. The body portion 110 is generally annular in structure, 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.

[0049] Reference Figure 2 and Figure 4 The body 110 of the first plastic body 100 is located within the space surrounded by multiple iron core units 210, and multiple connecting portions 120 of the first plastic body 100 extend correspondingly to the multiple iron core units 210. At this time, the multiple iron core units 210 are arranged at intervals along the direction surrounding the first plastic body 100. The number of connecting portions 120 is equal to the number of iron core units 210. The multiple connecting portions 120 are correspondingly connected to the multiple iron core units 210, and the iron core units 210 and their corresponding connecting portions 120 are mutually constrained in the radial direction of the rotor assembly. That is, the iron core units 210 cannot detach from the first plastic body 100 radially outward along the rotor assembly. The connecting portions 120 and the iron 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 iron core units 210 are mutually constrained in the radial direction of the rotor assembly.

[0050] Therefore, by setting the first plastic-coated body 100, multiple core units 210 are connected to the first plastic-coated body 100 as a whole, which helps to improve the structural strength and structural stability of the rotor core 200. Furthermore, when the rotor assembly rotates, the connecting part 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 connecting part 120 to the core unit 210 cancels out the centrifugal force, preventing the core unit 210 from undergoing radial displacement relative to the first plastic-coated body 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 first plastic-coated body 100, thereby improving the structural strength and structural stability of the rotor assembly and enhancing the rotational reliability of the rotor assembly.

[0051] Reference Figure 4 and Figure 5 It is understood that the rotor assembly also includes a shaft 400, and a through hole 113 is provided in the middle of the body portion 110. The shaft 400 passes through the through hole 113 and is fixedly connected to the body portion 110. In this example, the first plastic-coated body 100 is a plastic part, and the body portion 110 is plastic-coated around the outer periphery of the shaft 400. The body portion 110 is fixedly connected to the shaft 400, meaning that the shaft 400 cannot move or rotate relative to the body portion 110. Therefore, the multiple core units 210, the shaft 400, and the first plastic-coated body 100 are connected into a whole, which helps to improve the structural strength of the rotor assembly.

[0052] Reference Figures 3 to 5 As shown, it can be understood that the first plastic body 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.

[0053] Reference Figure 3 and Figure 5Specifically, 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 first plastic coating 100 form a constraint in the axial direction of the rotor assembly, which helps to improve the bonding strength between the first plastic coating 100 and the corresponding core unit 210 and avoids axial displacement of the core unit 210 relative to the first plastic coating 100. That is to say, in this embodiment, all core units 210 and the first plastic coating 100 form a constraint in the axial direction of the rotor assembly, effectively preventing all core units 210 from axially displacing relative to the first plastic coating 100. Therefore, it can effectively improve the bonding strength between the first plastic body 100 and the rotor core 200, and further improve the structural strength and structural stability of the rotor assembly.

[0054] Of course, in other embodiments, only a portion of the connecting part 120 is connected to a first limiting part 130 at the end along the axial direction of the rotor assembly. For example, all connecting portions 120 may be connected to a first limiting portion 130 at the same end along the axial direction of the rotor assembly, thereby constraining the rotor core 200 and the first plastic-coated body 100 in one direction along the axial direction of the rotor assembly; or, only a portion of the connecting portions 120 may be connected to a first limiting portion 130 at both ends along the axial direction of the rotor assembly, thereby constraining a portion of the core unit 210 and the first plastic-coated body 100 in the axial direction of the rotor assembly; or, a portion of the connecting portions 120 may be connected to a first limiting portion 130 at one end along the axial direction of the rotor assembly, and another portion of the connecting portions 120 may be connected to a first limiting portion 130 at the other end along the axial direction of the rotor assembly, thereby constraining a portion of the core unit 210 and the first plastic-coated body 100 in one direction along the axial direction of the rotor assembly, and constraining another portion of the core unit 210 and the first plastic-coated body 100 in the other direction along the axial direction of the rotor assembly, and so on. All of the above embodiments can effectively improve the bonding strength between the first plastic-coated body 100 and the rotor core 200. The above are only some embodiments, and all embodiments will not be exhaustively described here. Therefore, by providing the first limiting part 130, the bonding strength between the first plastic body 100 and the rotor core 200 can be effectively improved, further enhancing the structural strength and structural stability of the rotor assembly.

[0055] Reference Figures 3 to 5It is understood that the first plastic body 100 also includes a second limiting part 140. At least one end of the first plastic body 100 along the axial direction of the rotor assembly is connected to a plurality of second limiting parts 140. The plurality of second limiting parts 140 located at the same end of the first plastic body 100 are arranged at equal intervals along the circumference of the rotor assembly. The plurality of second limiting parts 140 located at the same end respectively abut against the end face of one end of the plurality of permanent magnets 300 along the axial direction of the rotor assembly.

[0056] Reference Figures 3 to 5 Specifically, in this embodiment, the first plastic-coated body 100 has multiple second limiting portions 140 connected to both ends along the axial direction of the rotor assembly, and the number of second limiting portions 140 at the same end is equal to the number of permanent magnets 300. At one end of the first plastic-coated body 100, a second limiting portion 140 is connected between every two adjacent connecting portions 120. Two second limiting portions 140 arranged correspondingly along the axial direction of the rotor assembly abut against two opposite end faces of the corresponding permanent magnets 300 along the axial direction of the rotor assembly. Therefore, under the limiting action of the two second limiting portions 140, the corresponding permanent magnets 300 and the first plastic-coated body 100 form a constraint along the axial direction of the rotor assembly, thereby improving the bonding strength between the first plastic-coated body 100 and the permanent magnets 300 and preventing axial displacement of the permanent magnets 300 relative to the first plastic-coated body 100. In other words, in this embodiment, all permanent magnets 300 and the first plastic-coated body 100 form a constraint on each other along the axial direction of the rotor assembly, effectively preventing axial displacement of all permanent magnets 300 relative to the first plastic-coated body 100. Therefore, the bonding strength between the first plastic-coated body 100 and the permanent magnets 300 can be effectively improved, making the rotor core 200, multiple permanent magnets 300, shaft 400 and the first plastic-coated body 100 form a whole, thereby improving the structural strength and structural stability of the rotor assembly.

[0057] Continue to refer to Figure 3 The second limiting part 140 covers the entire end face of one end of the permanent magnet 300 along the axial direction of the rotor assembly, so as to increase the contact area between the second limiting part 140 and the permanent magnet 300, enhance the limiting effect, and further improve the bonding strength between the permanent magnet 300 and the first plastic body 100.

[0058] Of course, the second limiting part 140 can also limit the permanent magnet 300 by covering only a portion of the end face of one end of the permanent magnet 300 along the axial direction of the rotor assembly.

[0059] In other embodiments, only one end of the first plastic-coated body 100 along the axial direction of the rotor assembly is connected to a plurality of second limiting portions 140, and the number of second limiting portions 140 is equal to the number of permanent magnets 300. The plurality of second limiting portions 140 respectively abut against the end face of the plurality of permanent magnets 300 at the same end along the axial direction of the rotor assembly. This allows the plurality of permanent magnets 300 and the first plastic-coated body 100 to form a constraint in one direction of the axial direction of the rotor assembly, and also effectively improves the bonding strength between the first plastic-coated body 100 and the plurality of permanent magnets 300.

[0060] In this embodiment, the first plastic body 100 is a plastic part, which effectively reduces magnetic leakage. The first plastic body 100 can be connected to the rotor core 200, multiple permanent magnets 300 and the rotating shaft 400 through injection molding, which simplifies the manufacturing process.

[0061] Reference Figure 1 and Figure 3 It is understood that the rotor assembly also includes a second plastic-coated body 500, which covers the first plastic-coated body 100, the rotor core 200, and the plurality of permanent magnets 300. Specifically, the second plastic-coated body 500 covers a portion of the structure of the core unit 210 along the axial direction opposite to the rotor assembly, the core unit 210 along the radial direction opposite to the rotor assembly, the first plastic-coated body 100 along the axial direction opposite to the rotor assembly, and the permanent magnets 300 along the radial direction opposite to the rotor assembly. Thus, the structural strength of the rotor assembly is further enhanced by the second plastic-coated body 500.

[0062] Reference Figure 2 and Figure 7 To improve the bonding strength between the second plastic body 500 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 along the axial direction of the rotor assembly. Part of the structure of the second plastic body 500 fills the feed hole 212. This increases the constraint between the second plastic body 500 and the core unit 210, which is beneficial to further improving the structural strength and stability of the rotor assembly.

[0063] Therefore, by setting a first plastic body 100 connected to multiple iron core units 210, the first plastic body 100 is connected to multiple iron core units 210 respectively through multiple connecting parts 120. The connecting parts 120 and the iron core units 210 constrain each other in the radial direction of the rotor assembly, so that the multiple iron core units 210 are connected into a whole. At the same time, the first plastic body 100 limits the iron core units 210 in the axial direction through the first limiting part 130, and limits the permanent magnets 300 installed in the mounting slots 220 of the rotor iron core 200 in the axial direction through multiple second limiting parts 140. Thus, the first plastic body 100 is combined with the multiple iron core units 210 and the multiple permanent magnets 300, thereby enhancing the bonding strength between the first plastic body 100 and the rotor iron core 200 and the multiple permanent magnets 300, thereby enhancing the overall structural strength of the rotor assembly. When the rotor assembly operates at high speed, the first plastic sheath 100 applies a tensile force to the core unit 210 to counteract centrifugal force, ensuring a tight bond between the core unit 210 and the first plastic sheath 100. This effectively reduces the risk of deformation and cracking of the rotor assembly, and consequently reduces the risk of deformation and cracking of both the first and second plastic sheaths 100 and 500, thus meeting the requirements for high-speed operation. It is suitable for use in washing machine motors and can meet the requirements of high-speed operation during spin-drying. Furthermore, it effectively improves safety.

[0064] 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.

[0065] It is easy to understand that during the production of the rotor assembly, multiple core units 210, multiple permanent magnets 300, and the rotating shaft 400 are first positioned using a mold. This involves arranging and assembling the core units 210 and permanent magnets 300 alternately along the circumference. The first positioning part 230 and the second positioning part 240 respectively abut against two opposing walls of the permanent magnets 300 along the radial direction of the rotor assembly, positioning the permanent magnets 300 within the mounting groove 220 and preventing them from detaching from the mounting groove 220 due to magnetic attraction. Molten plastic is injected into the mold using an injection molding process. After the plastic cools, a first plastic envelope 100 is formed, which combines with the core units 210 and the permanent magnets 300 and encapsulates the outer circumference of the rotating shaft 400. This eliminates the need for the subsequent step of inserting the permanent magnets 300 into the mounting groove 220 of the rotor core 200, simplifying the assembly process, reducing assembly difficulty, and thus improving production efficiency. Then, another mold is used to position the first plastic body 100, multiple rotor cores 200, multiple permanent magnets 300 and the rotating shaft 400 as a whole. Then, molten plastic is injected into the mold through injection molding. After the plastic cools, a second plastic body 500 is formed. The second plastic body 500 encapsulates the first plastic body 100, rotor cores 200 and multiple permanent magnets 300. Thus, the second plastic body 500, the first plastic body 100, rotor cores 200, multiple permanent magnets 300 and the rotating shaft 400 form a whole, namely the rotor assembly, which has the advantages of high structural strength and good structural stability.

[0066] It is easy to understand that the materials of the first package of plastic body 100 and the second package of plastic body 500 can be the same or different.

[0067] Reference Figure 4 As shown, it can be understood that the maximum distance between the two ends of the second limiting portion 140 along the circumferential direction of the rotor assembly is greater than or equal to the maximum distance between the two ends of the permanent magnet 300 along the circumferential direction of the rotor assembly. That is, the second limiting portion 140 can cover the entire end face of one end of the permanent magnet 300 along the axial direction of the rotor assembly, so as to increase the contact area between the second limiting portion 140 and the permanent magnet 300, enhance the limiting effect, and further improve the bonding strength between the permanent magnet 300 and the first plastic body 100.

[0068] Reference Figure 4As shown, it can be understood that, along the circumference of the rotor assembly, the two ends of the second limiting portion 140 protrude from the two ends of the permanent magnet 300, and the portion of the second limiting portion 140 protruding from the permanent magnet 300 abuts against the end face of one end of the two iron core units 210 adjacent to the permanent magnet 300 along the axial direction of the rotor assembly. That is, the second limiting portion 140 abuts against both the permanent magnet 300 and the two iron core units 210 adjacent to the permanent magnet 300. Therefore, the second limiting portion 140 also forms a constraint with the two iron core units 210 located on both sides of the permanent magnet 300 along the circumference of the rotor assembly in the axial direction of the rotor assembly, further improving the bonding strength between the first plastic-coated body 100 and the multiple iron core units 210.

[0069] Reference Figures 3 to 5 As shown, in this embodiment, the first plastic-coated body 100 further includes a plurality of third limiting portions 150, the number of which is equal to the number of permanent magnets 300. A third limiting portion 150 is connected between every two second limiting portions 140 arranged axially along the rotor assembly. The third limiting portion 150 is located at the end of the second limiting portion 140 facing away from the main body 110, and the plurality of third limiting portions 150 abut against the side wall of the plurality of permanent magnets 300 facing away from the main body 110. Therefore, the third limiting portion 150 and the permanent magnets 300 form a constraint in the radial direction of the rotor assembly. The third limiting portion 150 can restrict the permanent magnets 300 from shifting outward along the radial direction of the rotor assembly, thereby further enhancing the bonding strength between the first plastic-coated body 100 and the permanent magnets 300 and improving the structural strength of the rotor assembly.

[0070] Reference Figure 5 and Figure 6 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 first plastic body 100 and the corresponding iron core unit 210, and improve the structural strength of the rotor assembly.

[0071] Reference Figure 5 and Figure 6 As 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 first plastic body 100, and improving the structural strength and structural stability of the rotor assembly.

[0072] Reference Figure 5 and Figure 6 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 first plastic body 100 and the corresponding core unit 210, which is beneficial to improving the structural strength of the rotor assembly.

[0073] Reference Figure 2 , Figure 6 and Figure 7As shown, it can be understood that the connecting portion 120 includes an extension portion 121 and a fourth 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 fourth limiting portion 122 is connected to the end of the extension portion 121 opposite to the body portion 110. The maximum distance between the two ends of the fourth 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 fourth limiting part 122 along the circumference of the rotor assembly can be understood as the maximum width of the fourth 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 fourth limiting part 122 is greater than the maximum width of the extension part 121, so that the fourth 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 fourth 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 fourth limiting part 122 and part of the extension part 121 are accommodated in the limiting groove 211. Alternatively, the fourth limiting part 122 and the entire extension 121 can be accommodated in the limiting groove 211. Therefore, with the cooperation of the fourth limiting part 122 and the limiting groove 211, the first plastic body 100 and the iron core unit 210 can be mutually constrained in the radial direction of the rotor assembly, which is beneficial to the combination of the iron core unit 210 and the first plastic body 100, thereby improving the structural strength and structural stability of the rotor assembly.

[0074] It is easy to understand that the maximum width of the connecting part 120 is the same as the maximum width of the fourth limiting part 122.

[0075] Reference Figure 2 , Figure 6 and Figure 7 As shown, it can be understood that the fourth limiting portion 122 protrudes from the two opposite walls of the extension portion 121 along the circumference of the rotor assembly at both ends of the fourth limiting portion 122. That is, the connecting portion 120 is approximately T-shaped. Therefore, the fourth 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 distribution. This is beneficial to improving the connection stability between the connecting portion 120 and the core unit 210, thereby increasing the bonding strength between the core unit 210 and the first plastic body 100, and further improving the structural strength and structural stability of the rotor assembly.

[0076] Reference Figure 2 and Figure 5 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 third 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 third 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 300 near the rotation axis of the rotor assembly abuts against two third positioning parts 112, or a portion of the structure of the second plastic body 500 is filled between the end of the permanent magnet 300 near the rotation axis of the rotor assembly and the third positioning part 112, thereby realizing the radial positioning of the permanent magnet 300 in the rotor assembly by the third positioning part 112, and improving the installation stability of the permanent magnet 300.

[0077] Part of the structure of the second plastic body 500 fills the groove 111 to enhance the bonding strength between the second plastic body 500, the permanent magnet 300, and the first plastic body 100. Compared to a scheme where two grooves 111 are located on either side of the third 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 third 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.

[0078] Because the stress is relatively high near the outer periphery of the first plastic body 100 in the rotor assembly, that is, the stress is relatively high in the structure of the second plastic body 500 at the groove 111, the molten plastic can quickly pass through the groove 111 with a large flow area during injection molding of the second plastic body 500. This avoids the formation of weld lines in the groove 111, thereby reducing the risk of cracking of the second plastic body 500 at the groove 111, improving the structural stability of the second plastic body 500, and thus improving the structural strength of the rotor assembly.

[0079] Reference Figure 6As 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 third 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 second plastic body 500; 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, by making 1.5mm ≤ D ≤ 3mm, while ensuring that the structural strength of the first plastic body 100 meets the requirements, the flow area of ​​the groove 111 is increased 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 second plastic body 500, and thus improving the structural strength of the rotor assembly.

[0080] The motor of the second aspect of this utility model includes a stator assembly and a rotor assembly of the first aspect of this utility model. The rotor assembly is rotatably disposed in the inner hole of the stator assembly and is capable of rotating relative to the stator assembly.

[0081] 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.

[0082] The electrical device according to the third aspect of this utility model includes the motor according to the second aspect of this utility model. The electrical device here may be a washing machine, dryer, dishwasher, etc., which will not be described in detail here.

[0083] 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.

[0084] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model 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 utility model.

Claims

1. A rotor assembly, characterized in that, include: The first plastic-coated body includes a main body, a plurality of connecting parts and a first limiting part. The plurality of connecting parts are connected to the main body and are arranged at intervals along the circumferential direction of the main body. At least one of the connecting parts is connected to the first limiting part at at least one end along the axial direction of the rotor assembly. The first plastic-coated body also includes a plurality of second limiting parts located at at least one end along the axial direction. The plurality of second limiting parts located at the same end are arranged at intervals along the circumferential direction. The rotor core includes multiple core units, which are arranged at intervals along the direction surrounding the first plastic-coated body. The multiple core units are correspondingly connected to multiple connecting parts, and the core units and the connecting parts constrain each other in the radial direction of the rotor assembly. An installation groove is provided between two adjacent core units. Multiple permanent magnets are correspondingly installed in multiple mounting slots; 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. The multiple second limiting parts located at the same end abut against the end faces of the multiple permanent magnets along the axial direction.

2. The rotor assembly according to claim 1, characterized in that: The maximum distance between the two ends of the second limiting part along the circumferential direction is greater than or equal to the maximum distance between the two ends of the permanent magnet along the circumferential direction.

3. The rotor assembly according to claim 2, characterized in that: Along the circumferential direction, the two ends of the second limiting part protrude from the two ends of the permanent magnet, and the part of the second limiting part protruding from the permanent magnet abuts against the end face of one end of the core unit along the axial direction.

4. The rotor assembly according to claim 1, characterized in that: The first plastic-coated body has a plurality of second limiting portions at both ends along the axial direction. Two second limiting portions corresponding to each other along the axial direction abut against the end faces of the permanent magnet at both ends along the axial direction. The first plastic-coated body also includes a plurality of third limiting portions. The plurality of third limiting portions are respectively connected between two second limiting portions corresponding to each other along the axial direction, and the third limiting portions abut against the side wall of the permanent magnet away from the main body.

5. The rotor assembly according to claim 1, characterized in that: The core unit is provided with a first positioning part and a second positioning part at both ends along the radial direction, and the first positioning part and the second positioning part respectively abut against the two end faces of the permanent magnet that are opposite to each other along the radial direction.

6. 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.

7. The rotor assembly according to claim 1, characterized in that: The connecting portion includes an extension portion and a fourth 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 fourth limiting portion is connected to the end of the extension portion away from the main body portion. The maximum distance between the two ends of the fourth 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 fourth limiting portion and at least part of the extension portion.

8. The rotor assembly according to claim 7, characterized in that: The fourth limiting portion protrudes from the two opposite walls of the extension portion along the circumferential direction at both ends.

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

10. The rotor assembly according to claim 9, characterized in that: The maximum depth of the groove along the radial direction is D, which satisfies: 1.5mm≤D≤3mm.

11. The rotor assembly according to claim 1, characterized in that: The rotor assembly also includes a shaft, and the first plastic-coated body covers the outer periphery of the shaft and is fixedly connected to the shaft.

12. The rotor assembly according to claim 1, characterized in that: The rotor assembly further includes a second plastic coating that covers the first plastic coating, the rotor core, and the plurality of permanent magnets.

13. An electric motor, characterized in that, Includes the rotor assembly as described in any one of claims 1 to 12.

14. Electrical equipment, characterized in that, Includes the motor as described in claim 13.

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