Rotor assembly, electric motor, and washing apparatus

Abstract

Provided in the present application are a rotor assembly, an electric motor, and a washing apparatus. The rotor assembly comprises: a rotor, comprising a rotor core and a plurality of permanent magnets, the rotor core being provided with a plurality of magnet slots, and the plurality of permanent magnets being respectively arranged in the plurality of magnet slots; and a plastic encapsulation member, wherein the rotor is encapsulated inside the plastic encapsulation member, the plastic encapsulation member comprises an end plate located at one end of the rotor in an axial direction of the rotor, and the end plate is provided with a plurality of first reinforcing ribs arranged spaced apart from each other in a circumferential direction of the rotor. At least one of the first reinforcing ribs extends in the radial direction of the rotor, the flow direction of a plastic encapsulation material can be affected during injection molding, and the distribution of weld lines is changed, such that part of the weld lines are expanded to the radial reinforcing rib, thereby reducing the extent to which the radial weld lines are expanded to the inner ring of the plastic encapsulation member, and reducing the extent to which the weld lines formed during the injection molding weaken the strength of the plastic encapsulation member, and thus achieving the purpose of improving the structural strength of the plastic encapsulation member.

Description

Rotor assembly, motor and washing apparatus

[0001] The present application claims priority to the Chinese Patent Application No. 202411845025.1, filed on December 13, 2024, and entitled "Rotor assembly, motor and washing apparatus", and the Chinese Patent Application No. 202423099460.2, filed on December 13, 2024, and entitled "Rotor assembly, motor and washing apparatus", the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of motor apparatus, in particular, to a rotor assembly, a motor and a washing apparatus. BACKGROUND

[0003] At present, the driving motor is one of the core components of the drum washing machine, and the motor speed reaches tens of thousands of revolutions per minute during dehydration. The rotor assembly of the motor is usually composed of a rotor core, a permanent magnet and a plastic package. The rotor assembly in the related art usually integrates the rotor core and the permanent magnet into one body by injection molding. However, the rotor assembly will produce a fusion line defect during the molding process, which reduces the strength of the rotor assembly. Under high-speed operation of the motor, the plastic package is prone to structural damage, i.e., cracking, due to the large centrifugal force it bears, which causes the motor to be stuck and unable to work normally. TECHNICAL SOLUTION

[0004] Embodiments of the present application aim to at least solve one of the technical problems existing in the prior art.

[0005] To this end, a first aspect of embodiments of the present application provides a rotor assembly.

[0006] A second aspect of embodiments of the present application provides a motor.

[0007] A third aspect of embodiments of the present application provides a washing apparatus.

[0008] Therefore, according to a first aspect of embodiments of the present application, a rotor assembly is provided, which comprises: a rotor, the rotor comprising a rotor core and a plurality of permanent magnets, the rotor core being provided with a plurality of magnet grooves, and the plurality of permanent magnets being respectively arranged in the plurality of magnet grooves; and a plastic package, the rotor being plastic-sealed in the interior of the plastic package, the plastic package comprising an end plate, the end plate being located at one end of the rotor along the axial direction of the rotor, the end plate being provided with a plurality of first reinforcing ribs, the plurality of first reinforcing ribs being arranged at intervals along the circumferential direction of the rotor, and at least one first reinforcing rib extending along the radial direction of the rotor.

[0009] In some embodiments, the end plate is provided with a plurality of pin holes, each pin hole is opposite to one permanent magnet along the axial direction of the rotor; and at least one first reinforcing rib is opposite to one pin hole along the radial direction of the rotor.

[0010] In some embodiments, the end plate is further provided with a mounting hole, the rotor assembly further comprises a rotating shaft, the rotating shaft is arranged in the rotor core and the mounting hole, and the plurality of first reinforcing ribs are located between the plurality of pin holes and the mounting hole.

[0011] In some embodiments, an end of the at least one first reinforcing rib away from the pin hole extends into the mounting hole.

[0012] In some embodiments, an end of the at least one first reinforcing rib away from the pin hole extends beyond the hole wall of the mounting hole.

[0013] In some embodiments, the end plate is further provided with a second reinforcing rib, the second reinforcing rib is located on the inner side of the plurality of first reinforcing ribs along the radial direction of the rotor, and is connected with the at least one first reinforcing rib, and at least a part of the second reinforcing rib extends along the circumferential direction of the rotor.

[0014] In some embodiments, the end plate is further provided with a glue inlet, and at least a part of the second reinforcing rib is located on the side of the mounting hole away from the glue inlet and is opposite to the glue inlet along the radial direction of the rotor.

[0015] In some embodiments, an end of the second reinforcing rib away from the plurality of pin holes extends into the mounting hole.

[0016] In some embodiments, an end of the second reinforcing rib away from the plurality of pin holes extends beyond the hole wall of the mounting hole.

[0017] In some embodiments, the second reinforcing rib is an annular rib, and the annular rib is connected with each first reinforcing rib.

[0018] In some embodiments, the end plate is further provided with a third reinforcing rib, and the third reinforcing rib and the second reinforcing rib are located on opposite sides of the mounting hole, respectively.

[0019] In some embodiments, the end surface of the end plate is recessed on the side of the rotor to form a weight-reducing groove along the axial direction of the rotor, and the plurality of first reinforcing ribs are arranged in the weight-reducing groove.

[0020] In some embodiments, the end plate comprises a first end plate and a second end plate, the first end plate and the second end plate are located at two ends of the rotor along the axial direction of the rotor, and at least one of the first end plate and the second end plate is provided with the plurality of first reinforcing ribs.

[0021] In some embodiments, the plastic package includes a molded plastic part; and / or the number of the first reinforcing ribs is greater than or equal to 4; and / or the width of the first reinforcing ribs in the circumferential direction of the rotor is greater than or equal to 1 mm.

[0022] According to a second aspect of the present application, there is provided an electric machine comprising the rotor assembly according to any one of the above technical solutions, thus having all the beneficial technical effects of the rotor assembly, which will not be repeated here.

[0023] According to a third aspect of the present application, there is provided a washing device comprising the rotor assembly or the electric machine according to any one of the above technical solutions, thus having all the beneficial technical effects of the rotor assembly or the electric machine, which will not be repeated here.

[0024] Additional aspects and advantages of the present application will be described in the following description, and will become apparent from the following description, or can be learned from the practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0026] FIG. 1 shows one of the structural schematic diagrams of a rotor assembly according to one embodiment of the present application;

[0027] FIG. 2 shows another of the structural schematic diagrams of a rotor assembly according to one embodiment of the present application;

[0028] FIG. 3 shows a third of the structural schematic diagrams of a rotor assembly according to one embodiment of the present application;

[0029] FIG. 4 shows a fourth of the structural schematic diagrams of a rotor assembly according to one embodiment of the present application;

[0030] FIG. 5 shows a fifth of the structural schematic diagrams of a rotor assembly according to one embodiment of the present application;

[0031] FIG. 6 shows one of the exploded views of a rotor assembly according to one embodiment of the present application;

[0032] FIG. 7 shows another of the exploded views of a rotor assembly according to one embodiment of the present application;

[0033] FIG. 8 shows a structural schematic diagram of an electric machine according to one embodiment of the present application;

[0034] FIG. 9 shows one of the distribution schematic diagrams of the weld lines after injection molding of a rotor assembly in the related art;

[0035] FIG. 10 shows another of the distribution schematic diagrams of the weld lines after injection molding of a rotor assembly in the related art;

[0036] Fig. 11 shows one of the schematic diagrams of the distribution of the weld lines of the rotor assembly after injection molding according to one embodiment of the present application;

[0037] Fig. 12 shows another of the schematic diagrams of the distribution of the weld lines of the rotor assembly after injection molding according to one embodiment of the present application.

[0038] In the figures, the correspondence between the reference numerals and the component names in Figs. 1-8 is as follows:

[0039] 100 rotor assembly, 110 rotor, 111 rotor core, 112 permanent magnet, 113 magnet slot, 120 plastic package, 121 end plate, 122 first reinforcing rib, 123 thimble hole, 124 mounting hole, 125 glue inlet, 126 second reinforcing rib, 127 third reinforcing rib, 128 lightening groove, 130 rotating shaft, 140 first end plate, 150 second end plate, 200 motor. Embodiments of the present application

[0040] In order to enable a clearer understanding of the above-mentioned purposes, features and advantages of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0041] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, and therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0042] Some embodiments of the rotor assembly 100, the motor 200 and the washing equipment according to the present application are described below with reference to Figs. 1-12.

[0043] In one embodiment according to the present application, as shown in Figs. 1, 2, 3, 4, 5, 6 and 7, a rotor assembly 100 is proposed, which comprises: a rotor 110, the rotor 110 comprising a rotor core 111 and a plurality of permanent magnets 112, the rotor core 111 being provided with a plurality of magnet slots 113, and the plurality of permanent magnets 112 being respectively arranged in the plurality of magnet slots 113; a plastic package 120, the rotor 110 being plastic-sealed inside the plastic package 120, the plastic package 120 comprising an end plate 121, the end plate 121 being located at one end of the rotor 110 along the axial direction of the rotor 110, the end plate 121 being provided with a plurality of first reinforcing ribs 122, the plurality of first reinforcing ribs 122 being arranged at intervals along the circumferential direction of the rotor 110, and at least one first reinforcing rib 122 extending along the radial direction of the rotor 110.

[0044] The rotor assembly 100 provided by the embodiment of the present application comprises a rotor 110 and a plastic package 120. Specifically, the rotor 110 comprises a rotor core 111 and a plurality of permanent magnets 112. The rotor core 111 is provided with a plurality of magnet grooves 113. Each permanent magnet 112 is inserted into one magnet groove 113, that is, the plurality of magnet grooves 113 correspond to the plurality of permanent magnets 112 one by one. Exemplarily, the rotor core 111 is formed by stacking and riveting a certain number of silicon steel sheets. Each silicon steel sheet is provided with a plurality of magnetic grooves. After the plurality of silicon steel sheets are stacked, the plurality of magnetic grooves extending through the rotor 110 in the axial direction form one magnet groove 113. Exemplarily, the plurality of magnet grooves 113 are distributed at intervals in the circumferential direction of the rotor 110.

[0045] It can be understood that after the plurality of permanent magnets 112 are inserted into the plurality of magnet grooves 113, the rotor core 111 and the plurality of permanent magnets 112 are placed in an injection mold together to perform an injection molding process. The injection molding process is to wrap the rotor core 111 and the plurality of permanent magnets 112 integrally with the plastic package 120 to ensure the strength of the whole rotor assembly 100. However, during the injection molding process, the plastic package 120 will generate a welding line. Due to the existence of the welding line, the strength of the plastic package 120 will be reduced. When the motor 200 operates at a high speed, the plastic package 120 is easy to crack under the action of a large centrifugal force.

[0046] Moreover, according to the flow direction of the plastic material (mass plastic material) during the injection molding process, the welding line formed generally extends in the radial direction of the rotor 110, and the welding line formed in the related art generally extends to the inner ring of the plastic package 120, so that the plastic package 120 is easy to crack from the inner ring to the outside under the action of a large centrifugal force.

[0047] The plastic package 120 comprises an end plate 121. The end plate 121 is located at one end of the rotor 110 in the axial direction. Exemplarily, the number of the end plate 121 is two. The two end plates 121 are respectively located at the two ends of the rotor 110 in the axial direction, that is, a first end plate 140 and a second end plate 150. Exemplarily, the plastic package 120 further comprises a connecting piece. The connecting piece is located between the first end plate 140 and the second end plate 150, and the two ends of the connecting piece are connected to the first end plate 140 and the second end plate 150 respectively.

[0048] The end plate 121 is provided with a plurality of first reinforcing ribs 122. The plurality of first reinforcing ribs 122 are arranged at intervals in the circumferential direction of the rotor 110. At least a part of at least one first reinforcing rib 122 extends in the radial direction of the rotor 110, that is, at least one first reinforcing rib 122 is a radial reinforcing rib.

[0049] Since the welding lines generally extend along the radial direction, by arranging the at least one radial reinforcing rib, the flow direction of the plastic material during the injection molding process can be affected, the distribution of the welding lines can be changed, and the welding lines can be distributed on the outer ring as much as possible. The final effect is that the radial welding lines are extended to the radial reinforcing rib, thereby reducing the degree of extension of the radial welding lines to the inner circle of the plastic part 120, reducing the degree of weakening of the strength of the plastic part 120 caused by the welding lines formed during the injection molding process, and further achieving the purpose of improving the structural strength of the plastic part 120. The problem of insufficient strength of the rotor assembly 100 caused by the welding lines is significantly improved, and the cracking of the plastic part 120 under the action of a large centrifugal force during high-speed operation of the motor 200 is avoided, thereby improving the stability and reliability of the motor 200.

[0050] At the same time, since the end plate 121 is provided with a plurality of first reinforcing ribs 122, the stress of the end face area and the side wall area of the central hole (mounting hole 124) of the end plate 121 under the overspeed working condition of the motor 200 can be reduced, which is beneficial to improving the strength of the whole rotor assembly 100.

[0051] Exemplarily, each first reinforcing rib 122 extends along the radial direction of the rotor 110, that is, the plurality of first reinforcing ribs 122 are radial reinforcing ribs.

[0052] Exemplarily, the plurality of first reinforcing ribs 122 are uniformly distributed.

[0053] As shown in FIGS. 1, 2, 3, 4, 5 and 7, in some embodiments, exemplarily, the end plate 121 is provided with a plurality of ejector pin holes 123, and each ejector pin hole 123 is opposite to one permanent magnet 112 along the axial direction of the rotor 110; wherein at least one first reinforcing rib 122 is opposite to one ejector pin hole 123 along the radial direction of the rotor 110.

[0054] In this embodiment, it is defined that the end plate 121 is provided with a plurality of ejector pin holes 123, and specifically, each ejector pin hole 123 is opposite to one permanent magnet 112 along the axial direction of the rotor 110. Exemplarily, the rotor injection mold comprises a plurality of ejector pins, each of which is inserted into one ejector pin hole 123, so as to ensure the position of the plurality of permanent magnets 112 in the axial direction of the rotor 110 during the injection molding process. When the injection is completed and cooled, the plurality of ejector pins are taken out of the plurality of ejector pin holes 123.

[0055] Due to the flow direction of the over-molded material in the injection molding process, the radial extending weld line formed generally passes through or is located near the pin hole 123. By arranging at least one first reinforcing rib 122 on the inner ring and opposite to one of the pin holes 123 in the radial direction of the rotor 110, the flow of the over-molded material is affected, the distribution of the weld line is improved, and the weld line is distributed on the outer ring as much as possible. The final effect is that the radial weld line extends to the first reinforcing rib, reduces the degree of extension of the radial weld line to the inner ring of the over-molded part 120, reduces the degree of weakening of the strength of the over-molded part 120 caused by the weld line formed in the injection molding process, and further improves the structural strength of the over-molded part 120 to avoid cracking of the motor 200 during high-speed operation.

[0056] Exemplarily, along the radial direction of the rotor 110, each first reinforcing rib 122 is opposite to one pin hole 123.

[0057] As shown in FIGS. 1, 2, 3, 4, 5 and 8, in some embodiments, the end plate 121 is further provided with a mounting hole 124, and the rotor assembly 100 further includes a rotating shaft 130, which is arranged through the rotor core 111 and the mounting hole 124. The plurality of first reinforcing ribs 122 are located between the plurality of pin holes 123 and the mounting hole 124.

[0058] In this embodiment, it is defined that the rotor assembly 100 further includes a rotating shaft 130, specifically, the rotating shaft 130 is arranged through the rotor core 111 and the mounting hole 124. Exemplarily, the rotor core 111 is further provided with a shaft hole located radially inward of the plurality of magnet slots 113 and mounted with the mounting hole 124. The rotating shaft 130 is arranged through the shaft hole and the mounting hole 124.

[0059] Due to the radial weld line formed in the related art generally extending to the inner ring of the over-molded part 120, the over-molded part 120 is prone to cracking from the inner ring to the outer ring under the action of a larger centrifugal force. By arranging the plurality of first reinforcing ribs 122 radially inward of the plurality of pin holes 123, the structural strength of the inner ring of the over-molded part 120 is improved, and the extension of the radial weld line to the inner ring of the over-molded part 120 is hindered, thereby the structural strength of the over-molded part 120 can be significantly improved, the situation that the motor 200 is stuck due to the cracking of the over-molded part 120 under high-speed operation of the motor 200 is avoided, and the reliability of the motor 200 is improved.

[0060] As shown in FIGS. 1 and 2, in some embodiments, exemplarily, an end of the at least one first reinforcing rib 122 away from the pin hole 123 extends into the mounting hole 124.

[0061] In this embodiment, since the plurality of first reinforcing ribs 122 are located between the plurality of pin holes 123 and the mounting hole 124, i.e., the mounting hole 124 is a center hole, i.e., the inner ring area of the overmold 120, at least one first reinforcing rib 122 extends to the mounting hole 124 from the end away from the pin hole 123, i.e., at least one first reinforcing rib 122 extends radially to the inner ring area of the overmold 120, thereby further improving the structural strength of the inner ring area of the overmold 120 while hindering the radial weld line from extending to the inner ring of the overmold 120, avoiding the situation that the motor 200 is stuck due to the cracking of the overmold 120 under high speed operation.

[0062] As shown in FIG. 3, in some embodiments, exemplarily, the end of at least one first reinforcing rib 122 away from the pin hole 123 exceeds the hole wall of the mounting hole 124.

[0063] In this embodiment, the end of at least one first reinforcing rib 122 away from the pin hole 123 exceeds the hole wall of the mounting hole 124, i.e., at least one first reinforcing rib 122 extends radially to the inner ring area of the overmold 120 and protrudes from the hole wall of the mounting hole 124, which is beneficial to further improve the structural strength of the inner ring area of the overmold 120 and significantly improve the problem of insufficient strength of the overmold 120 due to the existence of the weld line.

[0064] As shown in FIGS. 1, 2, 4, 5, 6 and 7, in some embodiments, exemplarily, the end plate 121 is further provided with a second reinforcing rib 126, which is located radially inside the plurality of first reinforcing ribs 122 and connected with at least one first reinforcing rib 122, and at least a portion of the second reinforcing rib 126 extends circumferentially along the rotor 110.

[0065] In this embodiment, it is defined that the end plate 121 is further provided with a second reinforcing rib 126, specifically, the second reinforcing rib 126 is located radially inside the plurality of first reinforcing ribs 122, and at least a portion of the second reinforcing rib 126 extends circumferentially along the rotor 110, thereby further improving the structural strength of the inner ring area of the overmold 120, hindering the radial weld line from extending to the inner ring of the overmold 120, reducing the extent of the radial weld line extending to the inner ring of the overmold 120, thereby reducing the extent of weakening the strength of the overmold 120 by the weld line formed during the injection molding process, improving the overall structural strength of the overmold 120, avoiding the cracking of the overmold 120 under the action of large centrifugal force during high speed operation of the motor 200, and improving the stability and reliability of the motor 200.

[0066] Since the second reinforcing rib 126 is connected with the at least one first reinforcing rib 122, the strength of the at least one first reinforcing rib 122 is improved, and the stress of the end plate 121 end surface area and the mounting hole 124 side wall area under the overspeed working condition is reduced under the cooperation of the at least one radial reinforcing rib and the circumferential reinforcing rib, so that the plastic package 120 is prevented from cracking under the overspeed working condition of the motor 200, and the reliability of the motor 200 under the overspeed working condition is improved.

[0067] FIGS. 9 and 10 are schematic diagrams of the distribution of the weld lines on the glue-in side end ring and the non-glue-in side end ring of the rotor assembly in the related art after injection molding, as shown in FIGS. 9 and 10, the weld lines extend to the inner ring without penetration. FIGS. 11 and 12 are schematic diagrams of the distribution of the weld lines on the glue-in side end ring (the first end plate 140) and the non-glue-in side end ring (the second end plate 150) of the rotor assembly 100 of the present application after injection molding, as shown in FIGS. 11 and 12, the weld lines extend to the inner ring rib position (the first reinforcing rib 122 and the second reinforcing rib 126) without penetration. Compared with the rotor assembly in the related art, the structural strength of the plastic package 120 is significantly improved by arranging the first reinforcing rib 122 and the second reinforcing rib 126, and cracking is avoided.

[0068] As shown in FIGS. 1, 2 and 6, in some embodiments, the end plate 121 is also provided with a glue inlet 125, and at least a part of the second reinforcing rib 126 is located on the side of the mounting hole 124 away from the glue inlet 125 and opposite to the glue inlet 125 in the radial direction of the rotor 110.

[0069] In this embodiment, it can be understood that according to the distribution of the weld lines after injection molding, there is a through radial weld line at the directly opposite position of the glue inlet 125, which significantly reduces the strength of the plastic package 120.

[0070] At least a part of the second reinforcing rib 126 is located on the side of the mounting hole 124 away from the glue inlet 125 and opposite to the glue inlet 125 in the radial direction of the rotor 110, that is, the second reinforcing rib 126 is arranged at the directly opposite position of the glue inlet 125, so as to further improve the distribution of the weld lines and the structural strength of the end plate 121 at this position, and thus improve the overall strength of the plastic package 120, solve the problem of insufficient strength of the plastic package 120 due to the existence of the weld lines, and prevent the plastic package 120 from cracking under the action of a large centrifugal force when the motor 200 operates at a high speed.

[0071] As shown in FIGS. 1, 4, 5 and 7, in some embodiments, the second reinforcing rib 126 extends to the inside of the mounting hole 124 at the end away from the plurality of needle holes 123.

[0072] In this embodiment, since the mounting hole 124 is the central hole, that is, the inner ring area of ​​the plastic-coated part 120, the end of the second reinforcing rib 126 away from the plurality of ejector pin holes 123 extends into the mounting hole 124. In other words, the second reinforcing rib 126 extends radially into the inner ring area of ​​the plastic-coated part 120, thereby preventing the radial weld line from extending into the inner ring of the plastic-coated part 120, while also helping to further improve the structural strength of the inner ring area of ​​the plastic-coated part 120.

[0073] As shown in Figure 1, in some embodiments, exemplarily, one end of the second reinforcing rib 126, away from the plurality of pin holes 123, extends beyond the wall of the mounting hole 124.

[0074] In this embodiment, the end of the second reinforcing rib 126 away from the ejector pin hole 123 extends beyond the wall of the mounting hole 124. That is, the second reinforcing rib 126 extends radially to the inner ring area of ​​the plastic-coated part 120 and protrudes from the wall of the mounting hole 124. This is beneficial to further improve the structural strength of the inner ring area of ​​the plastic-coated part 120 and significantly improve the problem of insufficient strength of the plastic-coated part 120 due to the presence of weld lines.

[0075] As shown in Figures 4, 5 and 7, in some embodiments, for example, the second reinforcing rib 126 is a ring rib, which connects each of the first reinforcing ribs 122.

[0076] In this embodiment, the second reinforcing rib 126 is defined as a ring rib. Specifically, the ring rib is connected to each of the first reinforcing ribs 122, thereby further improving the structural strength of the inner ring area of ​​the plastic-coated part 120. At the same time, it can also improve the strength of each of the first reinforcing ribs 122, which in turn helps to improve the overall strength of the plastic-coated part 120 and avoid cracking.

[0077] As shown in Figures 1, 2 and 6, in some embodiments, exemplary, the end plate 121 is further provided with a third reinforcing rib 127, and the third reinforcing rib 127 and the second reinforcing rib 126 are respectively located on opposite sides of the mounting hole 124.

[0078] In this embodiment, the end plate 121 is further provided with a third reinforcing rib 127. Specifically, the third reinforcing rib 127 and the second reinforcing rib 126 are located on opposite sides of the mounting hole 124. Since the second reinforcing rib 126 is located on the side of the mounting hole 124 away from the glue inlet 125, that is, the third reinforcing rib 127 is located on the side of the mounting hole 124 close to the glue inlet 125, it not only improves the distribution of weld lines directly opposite the glue inlet 125, but also helps to maintain the symmetry of the structure of the plastic-coated part 120, so that the overall mass distribution of the rotor assembly 100 is in the central axis, which helps to improve the reliability of the rotor assembly 100.

[0079] For example, the third reinforcing rib 127 has the same shape as the second reinforcing rib 126, that is, the third reinforcing rib 127 and the second reinforcing rib 126 are symmetrically distributed on opposite sides of the mounting hole 124.

[0080] As shown in Figures 1, 3, 4 and 7, in some embodiments, exemplary, along the axial direction of the rotor 110, the end plate 121 is recessed on the side facing the rotor 110 to form a weight-reducing groove 128, and a plurality of first reinforcing ribs 122 are disposed in the weight-reducing groove 128.

[0081] In this embodiment, a portion of the end plate 121 faces the side where the rotor 110 is located and is recessed along the axial direction to form a weight-reducing groove 128, thereby reducing the amount of plastic coating material used, which in turn helps to reduce the production cost of the rotor assembly 100 and the motor 200.

[0082] Multiple first reinforcing ribs 122 are arranged at intervals along the circumference of the rotor 110 in the weight reduction groove 128, thereby improving the distribution of radial weld lines, reducing the extent to which radial weld lines extend to the inner ring of the plastic-coated part 120, and improving the structural strength of the plastic-coated part 120, while avoiding an increase in the overall axial dimension of the rotor assembly 100 due to the setting of multiple first reinforcing ribs 122.

[0083] For example, multiple first reinforcing ribs 122 and the wall of the weight-reducing groove 128 enclose multiple weight-reducing cavities.

[0084] As shown in Figures 1, 2, 3, 6 and 7, in some embodiments, exemplarily, the end plate 121 includes a first end plate 140 and a second end plate 150. Along the axial direction of the rotor 110, the first end plate 140 and the second end plate 150 are respectively located at both ends of the rotor 110, and at least one of the first end plate 140 and the second end plate 150 is provided with a plurality of first reinforcing ribs 122.

[0085] In this embodiment, the end plate 121 is defined as including a first end plate 140 and a second end plate 150. Specifically, the first end plate 140 and the second end plate 150 are located at opposite ends of the rotor 110 along its axial direction. In some embodiments, the first end plate 140 is provided with a plurality of first reinforcing ribs 122, or the second end plate 150 is provided with a plurality of first reinforcing ribs 122, or both the first end plate 140 and the second end plate 150 are provided with a plurality of first reinforcing ribs 122. The specific configuration can be adjusted according to actual needs.

[0086] For example, the first end plate 140 is a glue inlet side end ring, that is, the first end plate 140 is provided with a glue inlet 125, and the second end plate 150 is a non-glue inlet side end ring.

[0087] In some embodiments, the plastic-coated part 120 includes, by way of example, a bulk molding compound; and / or the number of first reinforcing ribs 122 is greater than or equal to 4; and / or the width of the first reinforcing ribs 122 in the circumferential direction of the rotor 110 is greater than or equal to 1 mm.

[0088] In this embodiment, the plastic-coated part 120 includes a bulk molding compound, that is, the rotor 110 is encapsulated using BMC (Bulk Molding Compound) material. It is understood that BMC material has the characteristics of being easy to mold and having low cost, which helps to reduce the production cost of the motor 200 and the washing equipment.

[0089] The number of first reinforcing ribs 122 is greater than or equal to 4. For example, the number of first reinforcing ribs 122 can be 4, 5, 6, 7, 8, 9 or 10, which can be set according to actual needs.

[0090] Along the circumference of the rotor 110, the width of the first reinforcing rib 122 is greater than or equal to 1 mm. During the injection molding process, the partially formed weld line extends to the first reinforcing rib 122. This reduces the extent to which the radial weld line extends to the inner ring of the plastic-coated part 120, ensuring the strength of the first reinforcing rib 122 and preventing cracking. This is beneficial for further improving the overall structural strength of the plastic-coated part 120 and enhancing the reliability of the motor 200.

[0091] For example, the width of the second reinforcing rib 126 is greater than or equal to 1 mm along the radial direction of the rotor 110, thereby improving the distribution of weld lines while ensuring the structural strength of the second reinforcing rib 126.

[0092] The rotor plastic-coated part 120 is injection molded from BMC material and includes a glue-injected side end ring (first end plate 140) and a non-glue-injected side end ring (second end plate 150). Both end rings have three stepped surfaces: a first stepped surface (end face of end plate 121), a second stepped surface (wall of weight-reducing groove 128), and a third stepped surface (end face of rotor core 111). A plurality of permanent magnet ejector pin holes 123 are evenly distributed on the first stepped surface, the number matching that of the permanent magnets 112, with each ejector pin hole 123 axially aligned with a permanent magnet 112.

[0093] Several radial reinforcing ribs (first reinforcing ribs 122) are evenly distributed on both end rings, extending from the first stepped surface of the end ring (end plate 121) and connecting to the second stepped surface. The number of ribs is consistent with the number of permanent magnet ejector pin holes 123, and their circumferential positions correspond one-to-one with the ejector pin holes 123. Effect: By setting reinforcing ribs (first reinforcing ribs 122) on the end rings, the flow direction of BMC during injection molding is affected, the distribution of weld lines on the gate side end face and / or the non-gate side end face is changed, and the extent to which radial weld lines extend into the inner ring is reduced, thereby reducing the degree of strength reduction of the end ring.

[0094] On the inner ring of the second step surface of the glue inlet end ring (first end plate 140), directly opposite the glue inlet 125, an annular reinforcing rib (second reinforcing rib 126) is provided. The annular reinforcing rib connects to the radial reinforcing ribs (first reinforcing rib 122) on both sides. A weld line running radially through the glue inlet end face exists directly opposite the glue inlet 125, causing a significant decrease in strength. By providing the annular reinforcing rib, the distribution of the weld line can be improved, and the strength of the end ring at this location can be increased. Simultaneously, to maintain the structural symmetry of the rotor's plastic-coated part and ensure its mass distribution along the central axis, a similar annular reinforcing rib (third reinforcing rib 127) is also provided directly opposite the annular reinforcing rib (second reinforcing rib 126).

[0095] In another embodiment, an annular reinforcing rib (second reinforcing rib 126) is provided at a position directly opposite to the glue inlet 125 on the inner ring of the second step surface of the glue inlet side end ring (first end plate 140). The annular reinforcing rib is a complete circle, connecting all radial reinforcing ribs (first reinforcing rib 122), and forming several weight-reducing cavities at the second step surface, the number of which is the same as that of the radial reinforcing ribs.

[0096] The second step of the non-glue-infeed end ring (second end plate 150) extends towards the inner ring to form a radial reinforcing rib (first reinforcing rib 122). The number of radial reinforcing ribs on the non-glue-infeed end ring is the same as the number of radial reinforcing ribs on the glue-infeed end ring, and they are evenly distributed circumferentially. There is a radial weld line on the non-glue-infeed side, which is a weak point in strength. Setting a reinforcing rib (first reinforcing rib 122) here helps to improve the strength of the rotor (rotor assembly 100).

[0097] As shown in Figure 8, according to the second aspect of this application, an electric motor 200 is provided, including a rotor assembly 100 as provided in any of the above embodiments, and thus possesses all the beneficial technical effects of the rotor assembly 100, which will not be repeated here.

[0098] For example, motor 200 is a brushless DC motor.

[0099] According to a third aspect of this application, a washing device is provided, including a rotor assembly 100 or a motor 200 as provided in any of the above embodiments, and thus possessing all the beneficial technical effects of the rotor assembly 100 or the motor 200, which will not be repeated here.

[0100] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0101] In the description of the application, the terms "one embodiment", "some embodiments”, "certain embodiments”, etc. do not necessarily refer to the same embodiment or example, but instead can refer to one or more possible embodiments or examples that do not necessarily refer to prior art. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0102] The above only is the preferred embodiment of the present application, and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor assembly, wherein, include: The rotor includes a rotor core and a plurality of permanent magnets. The rotor core is provided with a plurality of magnet slots, and the plurality of permanent magnets are respectively disposed in the plurality of magnet slots. A plastic-coated component, wherein the rotor is encapsulated inside the plastic-coated component, the plastic-coated component includes an end plate along the axial direction of the rotor, the end plate being located at one end of the rotor, the end plate having a plurality of first reinforcing ribs, the plurality of first reinforcing ribs being arranged at intervals along the circumference of the rotor, and at least one first reinforcing rib extending radially along the rotor.

2. The rotor assembly according to claim 1, wherein, The end plate is provided with a plurality of pin holes, and each pin hole is opposite to one of the permanent magnets along the axial direction of the rotor; Along the radial direction of the rotor, at least one of the first reinforcing ribs is opposite to one of the pin holes.

3. The rotor assembly according to claim 2, wherein, The end plate is also provided with mounting holes, and the rotor assembly further includes: A rotating shaft passes through the rotor core and the mounting hole, and a plurality of first reinforcing ribs are located between a plurality of pin holes and the mounting hole.

4. The rotor assembly according to claim 3, wherein, At least one end of the first reinforcing rib, away from the pin hole, extends into the mounting hole.

5. The rotor assembly according to claim 4, wherein, At least one end of the first reinforcing rib, away from the pin hole, extends beyond the wall of the mounting hole.

6. The rotor assembly according to any one of claims 3 to 5, wherein, The end plate is also provided with a second reinforcing rib along the radial direction of the rotor. The second reinforcing rib is located inside the plurality of first reinforcing ribs and is connected to at least one of the first reinforcing ribs. At least a portion of the second reinforcing rib extends along the circumferential direction of the rotor.

7. The rotor assembly according to claim 6, wherein, The end plate is also provided with a glue inlet. Along the radial direction of the rotor, at least a portion of the second reinforcing rib is located on the side of the mounting hole away from the glue inlet and is opposite to the glue inlet.

8. The rotor assembly according to claim 6 or 7, wherein, The second reinforcing rib extends into the mounting hole from one end away from the plurality of pin holes.

9. The rotor assembly according to claim 8, wherein, The end of the second reinforcing rib that is away from the plurality of pin holes extends beyond the wall of the mounting hole.

10. The rotor assembly according to any one of claims 6 to 9, wherein, The second reinforcing rib is a ring rib, which connects each of the first reinforcing ribs.

11. The rotor assembly according to any one of claims 6 to 10, wherein, The end plate is also provided with a third reinforcing rib, which and the second reinforcing rib are respectively located on opposite sides of the mounting hole.

12. The rotor assembly according to any one of claims 1 to 11, wherein, Along the axial direction of the rotor, the end plate is recessed on one side of the rotor to form a weight-reducing groove, and a plurality of first reinforcing ribs are disposed in the weight-reducing groove.

13. The rotor assembly according to any one of claims 1 to 12, wherein, The end plate includes a first end plate and a second end plate. Along the axial direction of the rotor, the first end plate and the second end plate are respectively located at both ends of the rotor. At least one of the first end plate and the second end plate is provided with a plurality of the first reinforcing ribs.

14. The rotor assembly according to any one of claims 1 to 13, wherein, The plastic-coated component includes a bulk molding compound; and / or The number of the first reinforcing ribs is greater than or equal to 4; and / or The width of the first reinforcing rib in the circumferential direction of the rotor is greater than or equal to 1 mm.

15. An electric motor, wherein, Includes the rotor assembly as described in any one of claims 1 to 14.

16. A washing device, wherein, include: The rotor assembly as described in any one of claims 1 to 14; or The motor as described in claim 15.

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