Rotor assembly, motor and washing equipment

Abstract

The utility model provides a rotor assembly, a motor and a washing device, the rotor assembly comprises a rotor, the rotor comprises a rotor iron core and a plurality of permanent magnets, the rotor iron core is provided with a plurality of magnet grooves, and the plurality of permanent magnets are respectively arranged in the plurality of magnet grooves; the rotor is plastically packaged in the plastic-coated part, the plastic-coated part comprises an end plate, the end plate is located at one end of the rotor in the axial direction of the rotor, the end plate is provided with a plurality of first reinforcing ribs, the plurality of first reinforcing ribs are arranged at intervals in the circumferential direction of the rotor, and at least one first reinforcing rib extends in the radial direction of the rotor; in the injection molding process, the flow direction of a plastic-coated material can be influenced, the distribution of the weld lines can be changed, and part of the weld lines are expanded to the radial reinforcing ribs, so that the degree of expanding the radial weld lines to the inner ring of the plastic-coated part is reduced, and the degree of weakening the strength of the plastic-coated part by the weld lines formed in the injection molding process is reduced; therefore, the purpose of improving the structural strength of the plastic-coated part is achieved.

Description

Technical Field

[0001] This utility model relates to the field of motor equipment technology, and more specifically, to a rotor assembly, a motor, and a washing device. Background Technology

[0002] Currently, the drive motor is one of the core components of a drum washing machine. During spin-drying, the motor speed reaches tens of thousands of revolutions per minute. The rotor assembly of the motor is usually composed of a rotor core, permanent magnets, and a plastic-coated component. In related technologies, the rotor assembly is usually integrated with the rotor core and permanent magnets by injection molding. However, weld line defects can occur during the molding process, reducing the strength of the rotor assembly. Under high-speed motor operation, the plastic-coated component is prone to structural damage due to the large centrifugal force it experiences, i.e., the plastic-coated component cracks, causing the motor to seize up and malfunction. Utility Model Content

[0003] The embodiments of this utility model are intended to solve at least one of the technical problems existing in the prior art.

[0004] Therefore, a first aspect of the embodiments of the present invention provides a rotor assembly.

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

[0006] A third aspect of the embodiments of this utility model provides a washing device.

[0007] In view of the above, according to a first aspect of the present invention, a rotor assembly is provided, the rotor assembly comprising: a rotor, the rotor including a rotor core and a plurality of permanent magnets, the rotor core having a plurality of magnet slots, the plurality of permanent magnets being respectively disposed in the plurality of magnet slots; and a plastic-coated component, the rotor being plastic-encapsulated inside the plastic-coated component, the plastic-coated component including an end plate, the end plate being located at one end of the rotor along the axial direction 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.

[0008] The rotor assembly provided in this embodiment of the utility model includes a rotor and a plastic-coated component. Specifically, the rotor includes a rotor core and multiple permanent magnets. The rotor core has multiple magnet slots, and each permanent magnet is inserted into one magnet slot, i.e., the multiple magnet slots correspond one-to-one with the multiple permanent magnets. Optionally, the rotor core is formed by stacking and riveting a certain number of silicon steel sheets. Each silicon steel sheet has multiple magnet slots. After the multiple silicon steel sheets are stacked, the multiple magnet slots that run through the rotor axis form a magnet slot. Optionally, the multiple magnet slots are distributed at intervals along the circumference of the rotor.

[0009] Understandably, after multiple permanent magnets are inserted into multiple magnet slots, they are placed together with the rotor core into an injection mold for injection molding. The injection molding process uses a plastic-coated component to encapsulate the rotor core and multiple permanent magnets as a whole to ensure the overall strength of the rotor assembly. However, during the injection molding process, weld lines are generated in the plastic-coated component. The presence of weld lines reduces the strength of the plastic-coated component, making it prone to cracking under the action of large centrifugal forces when the motor is running at high speed.

[0010] Moreover, depending on the flow direction of the plastic coating material (bulk molding compound) during the injection molding process, the weld line formed generally extends radially along the rotor, and the weld line formed in related technologies generally extends to the inner ring of the plastic coating part, causing the plastic coating part to easily crack from the inner ring outward under the action of a large centrifugal force.

[0011] The plastic-coated part includes an end plate located at one end of the rotor axial direction. Optionally, there are two end plates, located at opposite ends of the rotor axial direction, namely a first end plate and a second end plate. Optionally, the plastic-coated part also includes a connector located between the first end plate and the second end plate, with its two ends connected to the first end plate and the second end plate, respectively.

[0012] The end plate is provided with a plurality of first reinforcing ribs, and the plurality of first reinforcing ribs are arranged at intervals along the circumference of the rotor, wherein at least a portion of at least one first reinforcing rib extends along the radial direction of the rotor, that is, at least one first reinforcing rib is a radial reinforcing rib.

[0013] Since weld lines generally extend radially, by setting at least one radial reinforcing rib, the flow direction of the coating material can be affected during injection molding, changing the distribution of weld lines and making them distributed as much as possible on the outer ring. The final effect is that the radial weld lines extend to the radial reinforcing rib, thereby reducing the extent to which the radial weld lines extend to the inner ring of the coating part. This reduces the degree to which the weld lines formed during injection molding weaken the strength of the coating part, thereby achieving the purpose of improving the structural strength of the coating part. This significantly improves the problem of insufficient strength of the rotor assembly due to the presence of weld lines, avoids cracking of the coating part under large centrifugal force when the motor is running at high speed, and improves the stability and reliability of the motor.

[0014] Meanwhile, the presence of multiple first reinforcing ribs on the end plate can reduce the stress on the end face area and the side wall area of ​​the center hole (mounting hole) under motor overspeed conditions, which is beneficial to improving the overall strength of the rotor assembly.

[0015] Optionally, each first reinforcing rib extends radially along the rotor, meaning that all first reinforcing ribs are radial reinforcing ribs.

[0016] Optionally, multiple first reinforcing ribs are evenly distributed.

[0017] In addition, the rotor assembly provided by the above-described technical solution of this utility model also has the following additional technical features:

[0018] In some technical solutions, the end plate is optionally provided with a plurality of ejector pin holes, each ejector pin hole being opposite to a permanent magnet along the axial direction of the rotor; wherein, along the radial direction of the rotor, at least one first reinforcing rib is opposite to one of the ejector pin holes.

[0019] In this technical solution, the end plate is provided with multiple ejector pin holes. Specifically, along the axial direction of the rotor, each ejector pin hole is opposite to a permanent magnet. Optionally, the rotor injection mold includes multiple ejector pins, each ejector pin being inserted into an ejector pin hole, thereby ensuring the position of the multiple permanent magnets in the axial direction of the rotor during the injection molding process. After the injection molding is completed and cooled, the multiple ejector pins are removed from the multiple ejector pin holes.

[0020] Due to the flow direction of the coating material during injection molding, the radially extending weld lines generally pass through or are located near the ejector pin holes. By setting at least one first reinforcing rib in the inner ring and opposite one of the ejector pin holes in the rotor radial direction, the flow of the coating material is affected, the distribution of weld lines is improved, and the weld lines are distributed as much as possible in the outer ring. The final effect is that the radial weld lines extend to the first reinforcing rib, reducing the extent to which the radial weld lines extend to the inner ring of the coating part, reducing the degree to which the weld lines formed during injection molding weaken the strength of the coating part, thereby improving the structural strength of the coating part and preventing the motor from cracking when running at high speed.

[0021] Optionally, each first reinforcing rib is opposite a pin hole along the radial direction of the rotor.

[0022] In some technical solutions, the end plate is optionally provided with mounting holes, and the rotor assembly also includes a rotating shaft that passes through the rotor core and the mounting holes, with multiple first reinforcing ribs located between multiple ejector pin holes and the mounting holes.

[0023] In this technical solution, the rotor assembly is further defined as including a rotating shaft. Specifically, the rotating shaft passes through the rotor core and the mounting hole. Optionally, the rotor core is also provided with a shaft hole, which is located radially inside the plurality of magnet slots and is installed with the mounting hole. The rotating shaft passes through the shaft hole and the mounting hole.

[0024] Because the radial weld lines formed in related technologies generally extend into the inner ring of the plastic-coated part, the plastic-coated part is prone to cracking outward from the inner ring under large centrifugal forces. By placing multiple first reinforcing ribs radially inside multiple ejector pin holes, the structural strength of the inner ring of the plastic-coated part is improved while preventing the radial weld lines from extending into the inner ring of the plastic-coated part. This significantly improves the structural strength of the plastic-coated part, avoids motor seizure due to cracking of the plastic-coated part under high-speed conditions, and improves the reliability of the motor.

[0025] In some technical solutions, optionally, at least one end of the first reinforcing rib away from the ejector pin hole extends into the mounting hole.

[0026] In this technical solution, since multiple first reinforcing ribs are located between multiple ejector pin holes and mounting holes, i.e., the mounting hole is the central hole, which is also the inner ring area of ​​the plastic-coated part, at least one end of the first reinforcing rib away from the ejector pin hole extends into the mounting hole. In other words, at least one first reinforcing rib extends radially into the inner ring area of ​​the plastic-coated part. This can further enhance the structural strength of the inner ring area of ​​the plastic-coated part while preventing the radial weld line from extending into the inner ring of the plastic-coated part, thus avoiding the situation where the motor jams due to cracking of the plastic-coated part under high-speed operating conditions.

[0027] In some technical solutions, optionally, at least one end of the first reinforcing rib away from the ejector pin hole extends beyond the wall of the mounting hole.

[0028] In this technical solution, at least one end of the first reinforcing rib, away from the ejector pin hole, extends beyond the wall of the mounting hole. That is, at least one first reinforcing rib extends radially to the inner ring area of ​​the plastic-coated part and protrudes from the wall of the mounting hole. This is beneficial to further improve the structural strength of the inner ring area of ​​the plastic-coated part and significantly improve the problem of insufficient strength of the plastic-coated part due to the presence of weld lines.

[0029] In some technical solutions, the end plate may optionally be 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 first reinforcing rib. At least a portion of the second reinforcing rib extends along the circumferential direction of the rotor.

[0030] In this technical solution, the end plate is further provided with a second reinforcing rib. Specifically, the second reinforcing rib is located radially inside the plurality of first reinforcing ribs, and at least a portion of the second reinforcing rib extends along the circumferential direction of the rotor. This can further enhance the structural strength of the inner ring region of the plastic-coated part, prevent the radial weld line from extending into the inner ring of the plastic-coated part, reduce the extent to which the radial weld line extends into the inner ring of the plastic-coated part, thereby reducing the degree to which the weld line formed during the injection molding process weakens the strength of the plastic-coated part, improving the overall structural strength of the plastic-coated part, preventing the plastic-coated part from cracking under the action of a large centrifugal force when the motor is running at high speed, and improving the stability and reliability of the motor.

[0031] Since the second reinforcing rib is connected to at least one first reinforcing rib, it helps to improve the strength of at least one first reinforcing rib. At the same time, with the cooperation of at least one radial reinforcing rib and a circumferential reinforcing rib, the stress in the end plate end face area and the mounting hole side wall area under overspeed conditions can be reduced, avoiding cracking of the plastic-coated parts under motor overspeed conditions and improving the reliability of the motor under overspeed conditions.

[0032] In some technical solutions, the end plate may optionally be provided with a glue inlet, and at least a portion of the second reinforcing rib is located on the side of the mounting hole away from the glue inlet along the radial direction of the rotor and opposite to the glue inlet.

[0033] In this technical solution, it is understood that, based on the distribution of weld lines formed after injection molding, there are radially penetrating weld lines directly opposite the injection port, resulting in a significant decrease in the strength of the plastic-coated part.

[0034] Along the radial direction of the rotor, at least part of the second reinforcing rib is located on the side of the mounting hole away from the glue inlet, and the second reinforcing rib is opposite to the glue inlet, that is, the second reinforcing rib is set at the position directly opposite the glue inlet, so as to further improve the distribution of weld lines, enhance the structural strength of the end plate at this point, and thus improve the overall strength of the plastic-coated part. This solves the problem of insufficient strength of the plastic-coated part due to the presence of weld lines, and avoids the plastic-coated part from cracking under the action of large centrifugal force when the motor is running at high speed.

[0035] In some technical solutions, optionally, the end of the second reinforcing rib away from the multiple pin holes extends into the mounting hole.

[0036] In this technical solution, since the mounting hole is the central hole, which is also the inner ring area of ​​the plastic-coated part, the end of the second reinforcing rib away from the multiple ejector pin holes extends into the mounting hole. In other words, the second reinforcing rib extends radially into the inner ring area of ​​the plastic-coated part, which can help to further improve the structural strength of the inner ring area of ​​the plastic-coated part while preventing the radial weld line from extending into the inner ring of the plastic-coated part.

[0037] In some technical solutions, optionally, the end of the second reinforcing rib away from the multiple pin holes extends beyond the wall of the mounting hole.

[0038] In this technical solution, the end of the second reinforcing rib away from the ejector pin hole extends beyond the wall of the mounting hole. That is, the second reinforcing rib extends radially to the inner ring area of ​​the plastic-coated part and protrudes from the wall of the mounting hole. This helps to further improve the structural strength of the inner ring area of ​​the plastic-coated part and significantly improves the problem of insufficient strength of the plastic-coated part due to the presence of weld lines.

[0039] In some technical solutions, the second reinforcing rib is optionally a ring rib, which connects each of the first reinforcing ribs.

[0040] In this technical solution, the second reinforcing rib is defined as a ring rib. Specifically, the ring rib is connected to each of the first reinforcing ribs, which can further improve the structural strength of the inner ring area of ​​the plastic-coated part. At the same time, it can also improve the strength of each of the first reinforcing ribs, thereby helping to improve the overall strength of the plastic-coated part and avoid cracking.

[0041] In some technical solutions, the end plate may optionally be provided with a third reinforcing rib, with the third reinforcing rib and the second reinforcing rib located on opposite sides of the mounting hole, respectively.

[0042] In this technical solution, the end plate is further provided with a third reinforcing rib. Specifically, the third reinforcing rib and the second reinforcing rib are located on opposite sides of the mounting hole. Since the second reinforcing rib is located on the side of the mounting hole away from the inlet, that is, the third reinforcing rib is located on the side of the mounting hole closer to the inlet, this improves the distribution of weld lines directly opposite the inlet, while also helping to maintain the symmetry of the plastic-coated part structure. This ensures that the overall mass distribution of the rotor assembly is axially aligned with the central axis, thereby improving the reliability of the rotor assembly.

[0043] Optionally, the third reinforcing rib has the same shape as the second reinforcing rib, that is, the third reinforcing rib and the second reinforcing rib are symmetrically distributed on opposite sides of the mounting hole.

[0044] In some technical solutions, optionally, along the axial direction of the rotor, the end plate is recessed on the side facing the rotor to form a weight-reducing groove, and multiple first reinforcing ribs are provided in the weight-reducing groove.

[0045] In this technical solution, part of the end plate faces the side where the rotor is located and is recessed along the axial direction to form a weight-reducing groove, which can reduce the amount of plastic coating material used, thereby helping to reduce the production cost of rotor assembly and motor.

[0046] Multiple first reinforcing ribs are arranged at intervals along the circumference of the rotor in the weight reduction groove, 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, and improving the structural strength of the plastic-coated part, while avoiding an increase in the overall axial dimension of the rotor assembly due to the setting of multiple first reinforcing ribs.

[0047] In some technical solutions, the end plate may optionally include 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 located at both ends of the rotor, and at least one of the first end plate and the second end plate is provided with a plurality of first reinforcing ribs.

[0048] In this technical solution, the end plates are defined as including a first end plate and a second end plate. Specifically, the first end plate and the second end plate are located at opposite ends of the rotor axial direction. Specifically, the first end plate is provided with multiple first reinforcing ribs, or the second end plate is provided with multiple first reinforcing ribs, or both the first and second end plates are provided with multiple first reinforcing ribs. The specific configuration can be determined according to actual needs.

[0049] Optionally, the first end plate is a glue inlet side end ring, that is, the first end plate is provided with a glue inlet, and the second end plate is a non-glue inlet side end ring.

[0050] In some technical solutions, optionally, the plastic-coated part includes a bulk molding compound; and / or the number of first reinforcing ribs is greater than or equal to 4; and / or the width of the first reinforcing ribs in the rotor circumferential direction is greater than or equal to 1 mm.

[0051] In this technical solution, the plastic-coated parts include bulk molding compound parts, that is, the rotor 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 motors and washing equipment.

[0052] The number of first reinforcing ribs is greater than or equal to 4. Optionally, the number of first reinforcing ribs can be 4, 5, 6, 7, 8, 9 or 10, which can be set according to actual needs.

[0053] Along the circumference of the rotor, the width of the first reinforcing rib is greater than or equal to 1 mm. During the injection molding process, the partially formed weld line extends to the first reinforcing rib. This reduces the extent to which the radial weld line extends to the inner ring of the plastic-coated part, ensuring the strength of the first reinforcing rib and preventing it from cracking. This is beneficial for further improving the overall structural strength of the plastic-coated part and enhancing the reliability of the motor.

[0054] Optionally, the width of the second reinforcing rib is greater than or equal to 1 mm along the radial direction of the rotor, thereby improving the distribution of weld lines while ensuring the structural strength of the second reinforcing rib.

[0055] According to a second aspect of the present invention, an electric motor is provided, comprising a rotor assembly as provided in any of the above technical solutions, and thus possessing all the beneficial technical effects of the rotor assembly, which will not be repeated here.

[0056] Optionally, the motor is a brushless DC motor.

[0057] According to a third aspect of the present invention, a washing device is provided, comprising a rotor assembly or motor as provided in any of the above technical solutions, and thus possessing all the beneficial technical effects of the rotor assembly or motor, which will not be repeated here.

[0058] Additional aspects and advantages of the present invention will be set forth in the description which follows, in part will be obvious from the description, or may be learned by practice of the present invention. Attached Figure Description

[0059] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0060] Figure 1 One of the schematic diagrams of a rotor assembly according to an embodiment of the present invention is shown;

[0061] Figure 2 A second schematic diagram of the rotor assembly according to an embodiment of the present invention is shown;

[0062] Figure 3 A third schematic diagram of the rotor assembly according to an embodiment of the present invention is shown;

[0063] Figure 4 A fourth schematic diagram of the structure of a rotor assembly according to an embodiment of the present invention is shown;

[0064] Figure 5 Fifth schematic diagram of a rotor assembly according to an embodiment of the present invention is shown;

[0065] Figure 6 One of the exploded views of a rotor assembly according to an embodiment of the present invention is shown;

[0066] Figure 7 A second exploded view of a rotor assembly according to an embodiment of the present invention is shown;

[0067] Figure 8 A schematic diagram of the structure of a motor according to an embodiment of the present invention is shown;

[0068] Figure 9 This shows one of the schematic diagrams of weld line distribution after injection molding of rotor assembly in related technologies;

[0069] Figure 10 This is the second schematic diagram showing the weld line distribution after injection molding of a rotor assembly in the relevant technology;

[0070] Figure 11 One of the schematic diagrams showing the weld line distribution after injection molding of a rotor assembly according to an embodiment of the present invention is shown;

[0071] Figure 12 This is shown as a second schematic diagram of the weld line distribution after injection molding of a rotor assembly according to an embodiment of the present invention.

[0072] in, Figures 1 to 8 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0073] 100 Rotor assembly, 110 Rotor, 111 Rotor core, 112 Permanent magnet, 113 Magnet slot, 120 Plastic-coated part, 121 End plate, 122 First reinforcing rib, 123 Ejector pin hole, 124 Mounting hole, 125 Glue inlet, 126 Second reinforcing rib, 127 Third reinforcing rib, 128 Weight reduction slot, 130 Shaft, 140 First end plate, 150 Second end plate, 200 Motor. Detailed Implementation

[0074] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0075] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0076] The following reference Figures 1 to 12 This invention describes a rotor assembly 100, a motor 200, and a washing device provided according to some embodiments of the present invention.

[0077] In one embodiment according to this application, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, a rotor assembly 100 is proposed, comprising: a rotor 110, the rotor 110 including a rotor core 111 and a plurality of permanent magnets 112, the rotor core 111 having a plurality of magnet slots 113, the plurality of permanent magnets 112 being respectively disposed in the plurality of magnet slots 113; and a plastic-coated part 120, the rotor 110 being plastic-coated inside the plastic-coated part 120, the plastic-coated part 120 including an end plate 121 along the axial direction of the rotor 110, the end plate 121 being located at one end of the rotor 110, the end plate 121 having a plurality of first reinforcing ribs 122, the plurality of first reinforcing ribs 122 being arranged at intervals along the circumference of the rotor 110, and at least one first reinforcing rib 122 extending radially along the rotor 110.

[0078] The rotor assembly 100 provided in this embodiment of the present invention includes a rotor 110 and a plastic-coated part 120. Specifically, the rotor 110 includes a rotor core 111 and a plurality of permanent magnets 112. The rotor core 111 is provided with a plurality of magnet slots 113, and each permanent magnet 112 is inserted into a magnet slot 113, that is, the plurality of magnet slots 113 correspond one-to-one with the plurality of permanent magnets 112. Optionally, 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 magnet slots. After the plurality of silicon steel sheets are stacked, the plurality of magnet slots that run through the rotor 110 axially form a magnet slot 113. Optionally, the plurality of magnet slots 113 are distributed at intervals along the circumference of the rotor 110.

[0079] Understandably, after multiple permanent magnets 112 are inserted into multiple magnet slots 113, they are placed together with the rotor core 111 into an injection mold for injection molding. The injection molding process uses a plastic-coated part 120 to completely encapsulate the rotor core 111 and the multiple permanent magnets 112, ensuring the overall strength of the rotor assembly 100. However, during the injection molding process, weld lines are generated in the plastic-coated part 120. The presence of these weld lines reduces the strength of the plastic-coated part 120, making it prone to cracking under significant centrifugal force when the motor 200 is running at high speed.

[0080] Moreover, depending on the flow direction of the plastic coating material (bulk molding compound) during the injection molding process, the weld line formed generally extends radially along the rotor 110, and the weld line formed in related technologies generally extends to the inner ring of the plastic coating part 120, causing the plastic coating part 120 to easily crack from the inner ring outward under the action of a large centrifugal force.

[0081] The plastic-coated part 120 includes an end plate 121 located at one end of the rotor 110 along the axial direction. Optionally, there are two end plates 121, located at opposite ends of the rotor 110 along the axial direction, namely a first end plate 140 and a second end plate 150. Optionally, the plastic-coated part 120 also includes a connector located between the first end plate 140 and the second end plate 150, with both ends connected to the first end plate 140 and the second end plate 150, respectively.

[0082] The end plate 121 is provided with a plurality of first reinforcing ribs 122, and the plurality of first reinforcing ribs 122 are arranged at intervals along the circumference of the rotor 110, wherein at least a portion of at least one first reinforcing rib 122 extends radially along the rotor 110, that is, at least one first reinforcing rib 122 is a radial reinforcing rib.

[0083] Since weld lines generally extend radially, by setting at least one radial reinforcing rib, the flow direction of the coating material can be affected during injection molding, changing the distribution of weld lines and making them distributed as much as possible on the outer ring. The final effect is that the radial weld lines extend to the radial reinforcing rib, thereby reducing the extent to which the radial weld lines extend to the inner ring of the coating part 120, reducing the degree to which the weld lines formed during injection molding weaken the strength of the coating part 120, and thus achieving the purpose of improving the structural strength of the coating part 120. This significantly improves the problem of insufficient strength of the rotor assembly 100 due to the presence of weld lines, avoids cracking of the coating part 120 under large centrifugal force when the motor 200 is running at high speed, and improves the stability and reliability of the motor 200.

[0084] Meanwhile, since multiple first reinforcing ribs 122 are provided on the end plate 121, the stress on the end face area and the side wall area of ​​the center hole (mounting hole 124) of the end plate 121 under the overspeed condition of the motor 200 can be reduced, which is beneficial to improving the overall strength of the rotor assembly 100.

[0085] Optionally, each first reinforcing rib 122 extends radially along the rotor 110, that is, all of the first reinforcing ribs 122 are radial reinforcing ribs.

[0086] Optionally, multiple first reinforcing ribs 122 are evenly distributed.

[0087] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, in some embodiments, optionally, the end plate 121 is provided with a plurality of pin holes 123, each pin hole 123 being opposite to a permanent magnet 112 along the axial direction of the rotor 110; wherein, along the radial direction of the rotor 110, at least one first reinforcing rib 122 is opposite to one of the pin holes 123.

[0088] In this embodiment, the end plate 121 is provided with a plurality of ejector pin holes 123. Specifically, along the axial direction of the rotor 110, each ejector pin hole 123 is opposite to a permanent magnet 112. Optionally, the rotor injection mold includes a plurality of ejector pins, each ejector pin being inserted into an ejector pin hole 123, thereby ensuring the position of the plurality of permanent magnets 112 in the axial direction of the rotor 110 during the injection molding process. After the injection molding is completed and cooled, the plurality of ejector pins are removed from the plurality of ejector pin holes 123.

[0089] Due to the flow direction of the coating material during injection molding, the radially extending weld lines generally pass through or are located near the ejector pin holes 123. By setting at least one first reinforcing rib 122 in the inner ring and opposite one of the ejector pin holes 123 in the radial direction of the rotor 110, the flow of the coating material is affected, the distribution of weld lines is improved, and the weld lines are distributed as much as possible in the outer ring. The final effect is that the radial weld lines extend to the first reinforcing rib, reducing the extent to which the radial weld lines extend to the inner ring of the coating part 120, reducing the degree to which the weld lines formed during injection molding weaken the strength of the coating part 120, thereby improving the structural strength of the coating part 120 and preventing the motor 200 from cracking when running at high speed.

[0090] Optionally, along the radial direction of the rotor 110, each first reinforcing rib 122 is opposite to a pin hole 123.

[0091] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 8As shown, in some embodiments, the end plate 121 is optionally provided with mounting holes 124, and the rotor assembly 100 also includes a rotating shaft 130, which passes through the rotor core 111 and the mounting holes 124, and a plurality of first reinforcing ribs 122 are located between a plurality of pin holes 123 and mounting holes 124.

[0092] In this embodiment, the rotor assembly 100 is further defined as including a rotating shaft 130. Specifically, the rotating shaft 130 passes through the rotor core 111 and the mounting hole 124. Optionally, the rotor core 111 is also provided with a shaft hole located radially inside the plurality of magnet slots 113 and installed with the mounting hole 124. The rotating shaft 130 passes through the shaft hole and the mounting hole 124.

[0093] Because the radial weld lines formed in related technologies generally extend to the inner ring of the plastic-coated part 120, the plastic-coated part 120 is prone to cracking from the inner ring outward under large centrifugal forces. By placing multiple first reinforcing ribs 122 radially inside multiple ejector pin holes 123, the structural strength of the inner ring of the plastic-coated part 120 is improved while preventing the radial weld lines from extending to the inner ring of the plastic-coated part 120. This significantly improves the structural strength of the plastic-coated part 120, avoids the situation where the motor 200 seizes up due to cracking of the plastic-coated part 120 under high-speed conditions, and improves the reliability of the motor 200.

[0094] like Figure 1 and Figure 2 As shown, in some embodiments, optionally, at least one end of the first reinforcing rib 122 away from the pin hole 123 extends into the mounting hole 124.

[0095] In this embodiment, since multiple first reinforcing ribs 122 are located between multiple ejector pin holes 123 and mounting holes 124, i.e., the mounting hole 124 is the central hole, which is also the inner ring area of ​​the plastic coating 120, at least one end of the first reinforcing rib 122 away from the ejector pin hole 123 extends into the mounting hole 124. That is to say, at least one first reinforcing rib 122 extends radially into the inner ring area of ​​the plastic coating 120. This can further improve the structural strength of the inner ring area of ​​the plastic coating 120 while preventing the radial weld line from extending into the inner ring of the plastic coating 120, thus avoiding the situation where the motor 200 jams due to cracking of the plastic coating 120 under high speed conditions.

[0096] like Figure 3 As shown, in some embodiments, optionally, at least one end of the first reinforcing rib 122 away from the pin hole 123 extends beyond the wall of the mounting hole 124.

[0097] In this embodiment, at least one end of the first reinforcing rib 122 away from the ejector pin hole 123 extends beyond the wall of the mounting hole 124. That is, at least one first reinforcing rib 122 extends radially to the inner ring region 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 region 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.

[0098] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in some embodiments, the end plate 121 may optionally be provided with a second reinforcing rib 126 along the radial direction of the rotor 110. The second reinforcing rib 126 is located inside the plurality of first reinforcing ribs 122 and is connected to at least one first reinforcing rib 122. At least a portion of the second reinforcing rib 126 extends along the circumferential direction of the rotor 110.

[0099] In this embodiment, 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 along the circumferential direction of the rotor 110. This can further enhance the structural strength of the inner ring region of the plastic-coated part 120, prevent the radial weld line from extending to the inner ring of the plastic-coated part 120, reduce the extent to which the radial weld line extends to the inner ring of the plastic-coated part 120, thereby reducing the degree to which the weld line formed during the injection molding process weakens the strength of the plastic-coated part 120, improving the overall structural strength of the plastic-coated part 120, preventing the plastic-coated part 120 from cracking under the action of a large centrifugal force when the motor 200 is running at high speed, and improving the stability and reliability of the motor 200.

[0100] Since the second reinforcing rib 126 is connected to at least one first reinforcing rib 122, it helps to improve the strength of at least one first reinforcing rib 122. At the same time, with the cooperation of at least one radial reinforcing rib and a circumferential reinforcing rib, the stress in the end face area of ​​the end plate 121 and the side wall area of ​​the mounting hole 124 under overspeed conditions can be reduced, avoiding cracking of the plastic-coated part 120 under the overspeed conditions of the motor 200 and improving the reliability of the motor 200 under overspeed conditions.

[0101] Figure 9 and Figure 10 These are schematic diagrams showing the distribution of weld lines on the injection-molded end ring and the non-injection-molded end ring of the rotor assembly in related technologies, as follows: Figure 9 and Figure 10 As shown, the fusion line extends to the inner ring without penetrating through. Figure 11 and Figure 12This is a schematic diagram showing the distribution of weld lines on the injection-molded end ring (first end plate 140) and the non-injection-molded end ring (second end plate 150) of the rotor assembly 100 of this utility model after injection molding. Figure 11 and Figure 12 As shown, the weld line extends to the inner ring rib (first reinforcing rib 122 and second reinforcing rib 126) without penetrating. Compared with the rotor assembly in related technologies, by setting the first reinforcing rib 122 and the second reinforcing rib 126, the structural strength of the plastic-coated part 120 can be significantly improved, and cracking can be avoided.

[0102] like Figure 1 , Figure 2 and Figure 6 As shown, in some embodiments, the end plate 121 may optionally be provided with a glue inlet 125. Along the radial direction of the rotor 110, at least a portion 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.

[0103] In this embodiment, it can be understood that, based on the distribution of weld lines formed after injection molding, there is a radially penetrating weld line directly opposite the injection port 125, which causes a significant decrease in the strength of the plastic-coated part 120.

[0104] Along the radial direction of the rotor 110, at least a portion of the second reinforcing rib 126 is located on the side of the mounting hole 124 away from the glue inlet 125, and the second reinforcing rib 126 is opposite to the glue inlet 125. That is, the second reinforcing rib 126 is set at the position directly opposite to the glue inlet 125 to further improve the distribution of weld lines, enhance the structural strength of the end plate 121, and thus improve the overall strength of the plastic-coated part 120. This solves the problem of insufficient strength of the plastic-coated part 120 due to the presence of weld lines, and prevents the plastic-coated part 120 from cracking under the action of large centrifugal force when the motor 200 is running at high speed.

[0105] like Figure 1 , Figure 4 , Figure 5 and Figure 7 As shown, in some embodiments, optionally, one end of the second reinforcing rib 126 away from the plurality of pin holes 123 extends into the mounting hole 124.

[0106] 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.

[0107] like Figure 1As shown, in some embodiments, optionally, 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.

[0108] 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.

[0109] like Figure 4 , Figure 5 and Figure 7 As shown, in some embodiments, optionally, the second reinforcing rib 126 is a ring rib, and the ring rib connects each of the first reinforcing ribs 122.

[0110] 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.

[0111] like Figure 1 , Figure 2 and Figure 6 As shown, in some embodiments, the end plate 121 may optionally be 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.

[0112] 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.

[0113] Optionally, 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.

[0114] like Figure 1 , Figure 3 , Figure 4 and Figure 7As shown, in some embodiments, optionally, 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 provided in the weight-reducing groove 128.

[0115] 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.

[0116] 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.

[0117] Optionally, multiple first reinforcing ribs 122 and the wall of the weight-reducing groove 128 enclose multiple weight-reducing cavities.

[0118] like Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, in some embodiments, the end plate 121 may optionally include 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 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.

[0119] 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. Specifically, 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.

[0120] Optionally, 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.

[0121] In some embodiments, the plastic-coated part 120 may optionally include 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.

[0122] 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.

[0123] The number of first reinforcing ribs 122 is greater than or equal to 4. Optionally, 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.

[0124] 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.

[0125] Optionally, 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.

[0126] 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.

[0127] 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.

[0128] A ring-shaped reinforcing rib (second reinforcing rib 126) is provided directly opposite 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 ring-shaped reinforcing rib connects to the radial reinforcing ribs (first reinforcing rib 122) on the left and right sides. There is a weld line running radially through the glue inlet side end face directly opposite the glue inlet 125, which causes a significant decrease in strength. By providing the ring-shaped reinforcing rib, the distribution of the weld line can be improved, and the strength of the end ring at this location can be increased. At the same time, in order to maintain the structural symmetry of the rotor plastic-coated part and distribute its mass along the central axis, a similar ring-shaped reinforcing rib (third reinforcing rib 127) is also provided directly opposite the ring-shaped reinforcing rib (second reinforcing rib 126).

[0129] 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.

[0130] 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. Setting a reinforcing rib (first reinforcing rib 122) here helps to improve the strength of the rotor (rotor assembly 100).

[0131] like Figure 8 As shown, according to a second aspect of the present invention, 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.

[0132] Optionally, motor 200 is a brushless DC motor.

[0133] According to a third aspect of the present invention, 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.

[0134] 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 utility model according to the specific circumstances.

[0135] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0136] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rotor assembly, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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 claim 3, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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 claim 6, characterized in that, The second reinforcing rib is a ring rib, which connects each of the first reinforcing ribs.

11. The rotor assembly according to claim 6, characterized in that, 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, characterized in that, 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 11, characterized in that, 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 11, characterized in that, 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, characterized in that, Includes the rotor assembly as described in any one of claims 1 to 14.

16. A washing device, characterized in that, 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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