Rotor assembly and motor
By setting a housing hole on the inner iron core and connecting the via glue part of the plastic wrap body, the problem of cracking of the plastic wrap body under extreme conditions is solved, the structural strength and stability of the rotor assembly are improved, and the motor is avoided. die.
Patent Information
- Application Number
- CN202420494678.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-13
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-03-13
AI Technical Summary
Under the extreme conditions of motor operation, the plastic wrap body is prone to cracking, causing the outer core and magnetic tiles to fall off, eat the air gap of the motor, and even cause the motor to get stuck.
By providing a receptacle hole on the inner core and connecting the via glue part of the plastic wrap body to the receptacle hole, the bonding force between the plastic wrap body and the inner core, the outer core, and the magnetic tiles is increased.
It improves the structural strength of the rotor assembly, reduces the risk of cracking, and avoids the phenomenon of motor stuck.
Smart Images
Figure CN222531395U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of motors, and in particular to a rotor assembly and a motor. Background Art
[0002] Some rotor components include an inner iron core, an outer iron core and magnetic tiles. The inner iron core, outer iron core and magnetic tiles are formed as one piece through plastic overmolding. The inner iron core and the outer iron core are not in direct contact, but are connected through the plastic overmolding. Under extreme conditions of motor operation, the plastic overmolding is prone to cracking, causing the outer iron core and magnetic tiles to separate, thereby eating up the air gap of the motor and even causing the motor to get stuck. Utility Model Content
[0003] The present application aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present application proposes a rotor assembly.
[0004] To achieve the above objectives, the present application discloses a rotor assembly, which includes:
[0005] An inner iron core is provided with a receiving hole;
[0006] An outer iron core, wherein a plurality of the outer iron cores are arranged around the inner iron core, and the outer iron cores and the inner iron cores are arranged alternately;
[0007] Magnetic tiles are provided between adjacent outer iron cores; and
[0008] The overmolded body connects the inner iron core, the outer iron core and the magnetic tile, and the overmolded body includes a via-hole glue portion, and the via-hole glue portion is connected to the accommodating hole.
[0009] In some embodiments of the present application, the accommodating hole is open at the end surface of the inner core.
[0010] In some embodiments of the present application, the accommodating hole passes through both axial sides of the inner core.
[0011] In some embodiments of the present application, the accommodating hole extends in an axial direction.
[0012] In some embodiments of the present application, the edge of the receiving hole is in a closed ring shape.
[0013] In some embodiments of the present application, along the radial direction, the minimum distance between the accommodating hole and the circumferential surface of the inner core is L1, satisfying L1 ≥ 0.5 mm.
[0014] In some embodiments of the present application, the inner core is provided with an axial hole, and the axial hole is suitable for installation of a rotating shaft. Along the radial direction, a minimum distance between the accommodating hole and the axial hole is L2, satisfying L2≥1mm.
[0015] In some embodiments of the present application, the minimum radial dimension of the accommodating hole through the center thereof is D, satisfying D≥1.5 mm.
[0016] In some embodiments of the present application, there are multiple accommodating holes, and the multiple accommodating holes are arranged alternately along the circumference of the inner iron core.
[0017] In some embodiments of the present application, the cross-section of the accommodating hole is circular.
[0018] In some embodiments of the present application, the cross-section of the receiving hole is oval-shaped, and the oval-shaped receiving hole is bent around the center of the inner iron core.
[0019] In some embodiments of the present application, the accommodating holes are identical; and / or the plurality of accommodating holes are arranged in a circle.
[0020] A second aspect of the present application discloses a motor, which includes a stator assembly and the above-mentioned rotor assembly, wherein the rotor assembly is rotatably disposed in the stator assembly.
[0021] The technical solution of the present application realizes the connection and fixation of the magnetic tiles, the outer iron core and the inner iron core through the plastic coating. On this basis, by setting a receiving hole on the inner iron core, the through-hole glue part of the plastic coating is connected to the receiving hole, thereby increasing the bonding force between the plastic coating and the inner iron core, the outer iron core and the magnetic tiles, which is beneficial to improve the structural strength of the rotor assembly and reduce the risk of cracking of the rotor assembly.
[0022] Other advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other designs can be obtained based on the structures shown in these drawings without paying any creative work.
[0024] Figure 1 A schematic diagram of a rotor assembly in some embodiments;
[0025] Figure 2 A cross-sectional view of a rotor assembly in some embodiments;
[0026] Figure 3 for Figure 2 Middle AA section view;
[0027] Figure 4 for Figure 2 Middle BB section view;
[0028] Figure 5 for Figure 2 A magnified view of the matching structure of the inner iron core and the plastic-encapsulated body;
[0029] Figure 6 Schematic diagram of the inner core axial direction in some embodiments (4 accommodating holes);
[0030] Figure 7 Schematic diagram of the inner core axial direction in some embodiments (three accommodating holes);
[0031] Figure 8 Schematic diagram of the inner core axial direction in some embodiments (5 accommodating holes);
[0032] Fig. 9 Schematic diagram of the inner core axial direction in some embodiments (six accommodating holes);
[0033] Fig.10 The cross-sectional view of the rotor assembly in some embodiments (the shape of the receiving hole and Figure 2 different);
[0034] Fig.11 for Fig.10 A magnified view of the matching structure of the inner iron core and the plastic-encapsulated body;
[0035] Fig.12 Schematic diagram of the inner core axial direction in some embodiments (4 accommodating holes and the shape is similar to Figures 6 to 9 different);
[0036] Fig.13 Schematic diagram of the inner core axial direction in some embodiments (three accommodating holes and the shape is similar to Figures 6 to 9 different);
[0037] Fig.14 Schematic diagram of the inner core axial direction in some embodiments (5 accommodating holes and the shape is similar to Figures 6 to 9 different);
[0038] Fig.15 Schematic diagram of a motor in some embodiments.
[0039] Description of Figure Numbers:
[0040] Motor 100, rotor assembly 200, inner iron core 1000, axial hole 1100, accommodating hole 1200, end face 1300, circumferential surface 1400, outer iron core 2000, magnetic tile 3000, plastic package 4000, through-hole glue part 4100, gap glue part 4200, upper surface glue part 4310, lower surface glue part 4320, radial glue part 4400.
[0041] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0043] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0044] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0045] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.
[0046] In the related art, the rotor assembly 200 includes an inner core 1000, an outer core 2000, a magnetic tile 3000 and a plastic package 4000. The plastic package 4000 is integrally formed to connect the inner core 1000, the outer core 2000 and the magnetic tile 3000. The plastic package 4000 includes a gap glue portion 4200, an upper surface glue portion 4310, a lower surface glue portion 4320, and a radial glue portion 4400. The gap glue portion 4200 is located between the inner core 1000 and the outer core 2000, and the upper surface glue portion 4310 is connected to the inner core 1000. 0. The outer core 2000 is connected to one side of the axial direction of the magnetic tile 3000, and the upper surface glue part 4310 is connected to the gap glue part 4200. The lower surface glue part 4320 is connected to the other side of the axial direction of the inner core 1000, the outer core 2000 and the magnetic tile 3000, and the lower surface glue part 4320 is connected to the gap glue part 4200. The radial glue part 4400 is located at the outer periphery of the rotor assembly 200, connecting the upper surface glue part 4310 and the lower surface glue part 4320, thereby connecting and fixing the inner core 1000, the outer core 2000 and the magnetic tile 3000. In the rotor assembly 200 of this scheme, under extreme conditions, the plastic body 4000 is prone to cracking during the operation of the motor 100, causing the outer core 2000 and the magnetic tile 3000 to separate from the inner core 1000 under the centrifugal action, eating up the air gap of the motor 100, and the motor 100 is stuck. To this end, the present application makes improvements to improve the structural strength of the rotor assembly 200 and reduce the risk of cracking of the rotor assembly 200 .
[0047] The first aspect of the present application discloses a rotor assembly 200, Figures 1 to 6 As shown, the rotor assembly 200 includes an inner core 1000, an outer core 2000, a magnetic tile 3000 and a plastic package 4000. The inner core 1000 is provided with a receiving hole 1200, and the number of the outer cores 2000 is multiple. The multiple outer cores 2000 are arranged around the inner core 1000, and the outer core 2000 needs to be designed to be spaced a certain distance from the inner core 1000, that is, the outer core 2000 and the inner core 1000 are not in contact, and magnetic tiles 3000 are arranged between adjacent outer cores 2000. The inner core 1000, the outer core 2000 and the magnetic tile 3000 are connected by the plastic package 4000. The plastic package 4000 includes a through-hole glue part 4100, and the through-hole glue part 4100 is connected in the receiving hole 1200.
[0048] The connection and fixation of the magnetic tile 3000, the outer iron core 2000 and the inner iron core 1000 are achieved through the plastic encapsulation body 4000. On this basis, a receiving hole 1200 is set on the inner iron core 1000, and the through-hole glue part 4100 of the plastic encapsulation body 4000 is connected to the receiving hole 1200. In this way, the bonding force between the plastic encapsulation body 4000 and the inner iron core 1000, the outer iron core 2000 and the magnetic tile 3000 is increased, which is beneficial to improve the structural strength of the rotor assembly 200 and reduce the risk of cracking of the rotor assembly 200.
[0049] Specifically, the inner core 1000 is located in the middle of the rotor assembly 200, and the inner core 1000 is provided with an axial hole 1100, and the axial hole 1100 is used for the shaft (not shown in the figure) to pass through and install. The number of the outer cores 2000 is multiple, and multiple means two or more. Figure 2 The number of outer cores 2000 shown is ten, and multiple outer cores 2000 are arranged around the inner core 1000, and the outer cores 2000 and the inner core 1000 are spaced a certain distance apart, that is, the outer cores 2000 are spaced a certain distance apart from the inner core 1000 roughly along the radial direction without direct contact. The materials of the outer cores 2000 and the inner core 1000 include but are not limited to silicon steel sheets, aluminum alloys, etc., and the materials of the magnetic tiles 3000 include but are not limited to ferrite, aluminum nickel cobalt, neodymium iron boron, samarium cobalt, etc. The specific structural shapes of the outer cores 2000, the specific structural shapes of the inner cores 1000, and the structural coordination between the magnetic tiles 3000 and the outer cores 2000 are not limited, and reference may be made to the relevant art.
[0050] An installation cavity is formed between two adjacent outer cores 2000 , and the magnetic tile 3000 is set in the installation cavity to be located between the two adjacent outer cores 2000 , and then the inner core 1000 , the outer core 2000 and the magnetic tile 3000 are connected and fixed by the plastic package 4000 . For example, an inner core 1000, an outer core 2000 and a magnetic tile 3000 are placed in a mold, and materials constituting the overmolded body 4000 are injected into the mold. These materials fill the gaps in the mold (the gaps include but are not limited to the gap between the inner core 1000 and the outer core 2000, the gap between the outer core 2000 and the magnetic tile 3000, the gap between the wall of the mold and the inner core 1000, the gap between the wall of the mold and the outer core 2000, and the gap between the wall of the mold and the magnetic tile 3000). After the materials are cooled and formed, the overmolded body 4000 can be formed. At this time, the overmolded body 4000 is formed with a gap glue portion 4200, an upper surface glue portion 4310, and a lower surface glue portion 43 20 and the radial glue part 4400, the gap glue part 4200 is located to connect the inner core 1000 and the outer core 2000, the upper surface glue part 4310 connects the gap glue part 4200 and the inner core 1000, the outer core 2000, and the magnetic tile 3000, the lower surface glue part 4320 connects the gap glue part 4200 and the inner core 1000, the outer core 2000, and the magnetic tile 3000, the radial glue part 4400 connects the upper surface glue part 4310, the lower surface glue part 4320 and the magnetic tile 3000, and the adjacent outer core 2000, so that the inner core 1000, the outer core 2000 and the magnetic tile 3000 are connected through the plastic body 4000, and the relevant technology can be referred to here.
[0051] It is understandable that the plastic encapsulation body 4000 connects the inner core 1000, the outer core 2000 and the magnetic tile 3000, and the connection here can be a direct connection or an indirect connection. For example, the plastic encapsulation body 4000 directly contacts the inner core 1000, the outer core 2000 and the magnetic tile 3000 to connect and fix the components together. Alternatively, the plastic encapsulation body 4000 is directly connected to the inner core 1000 and the outer core 2000, and the magnetic tile 3000 is fixed between two adjacent outer cores 2000 (the plastic encapsulation body 4000 is not connected to the magnetic tile 3000), so that the connection and fixation of the components can also be achieved.
[0052] The so-called plastic-encapsulated body 4000 is a structure formed by integrally molding a material. The material may be plastic or non-plastic (and non-metallic, such as ceramic, etc.), as long as the connection between the various components can be achieved. In this embodiment, the plastic-encapsulated body 4000 is made of plastic, so that integral molding can be achieved through injection molding, which is convenient, fast and low-cost.
[0053] In this embodiment, the inner core 1000 is further provided with a receiving hole 1200, and the overmolded body 4000 is further formed with a via-hole rubber portion 4100, that is, the overmolded body 4000 includes a via-hole rubber portion 4100 in addition to the gap rubber portion 4200, the upper surface rubber portion 4310, the lower surface rubber portion 4320 and the radial rubber portion 4400. During the molding process of the overmolded body 4000, the material enters the receiving hole 1200. After the overmolded body 4000 is molded, the material in the receiving hole 1200 forms a through-hole glue portion 4100, and the through-hole glue portion 4100 is connected to the receiving hole 1200. This can increase the bonding force between the overmolded body 4000 and the inner iron core 1000, thereby increasing the bonding force between the overmolded body 4000 and the outer iron core 2000 and the magnetic tile 3000. Such a design is conducive to improving the structural strength of the rotor assembly 200. The overmolded body 4000 is not easy to crack under the centrifugal action of the outer iron core 2000 and the magnetic tile 3000, thereby reducing the risk of cracking of the rotor assembly 200 and effectively avoiding the motor 100 from getting stuck.
[0054] Combination Figure 3 As shown, in some embodiments of the present application, the accommodating hole 1200 is open at the end surface 1300 of the inner core 1000, where the end surface 1300 refers to the end surface 1300 of the inner core 1000 along the axial direction, the inner core 1000 has two end surfaces 1300 along the axial direction, there is a peripheral surface 1400 between the two end surfaces 1300, a plurality of outer cores 2000 are arranged around the inner core 1000, that is, a plurality of outer cores 2000 surround the peripheral surface 1400 of the inner core 1000, and the gap glue portion 4200 has sufficient contact area with the outer core 2000 and the inner core 1000. , and the contact area between the upper surface glue part 4310 and / or the lower surface glue part 4320 and the end surface 1300 of the inner iron core 1000 is relatively small. For this reason, in this embodiment, the accommodating hole 1200 is opened at the end surface 1300 of the inner iron core 1000, so that the through-hole glue part 4100 is embedded from the end surface of the inner iron core 1000 and can be connected to the upper surface glue part 4310 and / or the lower surface glue part 4320, thereby strengthening the bonding strength between the upper surface glue part 4310 and / or the lower surface glue part 4320 and the end surface 1300 of the inner iron core 1000, and further improving the structural strength of the rotor assembly 200.
[0055] Combination Figure 3As shown, in some embodiments of the present application, the receiving hole 1200 passes through both axial sides of the inner iron core 1000, that is, the receiving hole 1200 is a through hole structure, and the receiving hole 1200 is open at one end surface 1300 of the inner iron core 1000, and is also open at the other end surface 1300 of the inner iron core 1000, thereby connecting both axial sides of the inner iron core 1000. When the material enters the receiving hole 1200, the bubbles in the receiving hole 1200 can escape from either end of the receiving hole 1200, so that the material fills the receiving hole 1200 as much as possible, effectively avoiding the presence of bubbles in the receiving hole 1200, thereby avoiding the decrease in the strength of the via glue part 4100 after molding. After the overmolded body 4000 is formed, the through-hole glue portion 4100 connects the upper surface glue portion 4310 and the lower surface glue portion 4320, and the through-hole glue portion 4100 realizes the pulling of the upper surface glue portion 4310 and the lower surface glue portion 4320. Through such a setting, an assembled connection structure similar to a chain is formed between the inner iron core 1000 and the outer iron core 2000, thereby further improving the bonding force between the components and greatly enhancing the structural strength of the rotor assembly 200.
[0056] There are many solutions for connecting the accommodating hole 1200 to the two axial sides of the inner core 1000, as long as it can be ensured that the accommodating hole 1200 is open at the two end surfaces 1300 of the inner core 1000. In this embodiment, Figure 3 As shown, the receiving hole 1200 is designed to extend in the axial direction. The so-called extending in the axial direction means that the receiving hole 1200 is roughly in a columnar structure. The other end of the receiving hole 1200 can be seen from any end of the receiving hole 1200. This facilitates the processing of the receiving hole 1200. During the molding process of the overmolded body 4000, the material flows more smoothly in the receiving hole 1200, ensuring the formation of the through-hole glue part 4100. For example, the receiving hole 1200 can be designed to extend in a straight line in the axial direction, and the cross-section of the receiving hole 1200 (i.e., the cross-section perpendicular to the receiving hole 1200, the same below) is consistent in size along the axial direction, so that the structural strength difference of the inner iron core 1000 along the axial direction can be avoided.
[0057] Combination Figure 5 and Figure 6 As shown, in some embodiments of the present application, the edge (contour) of the accommodating hole 1200 is designed to be a closed ring, so as to avoid a significant reduction in the structural strength of the inner core 1000.
[0058] Specifically, the edge (contour) of the receiving hole 1200 is designed to be a closed ring, that is, the edge of any cross section of the receiving hole 1200 perpendicular to the axial direction is a closed ring, so that the peripheral part of the receiving hole 1200 forms a complete wrapping of the receiving hole 1200 (that is, except for the two ends, the inner iron core 1000 forms a complete wrapping of the receiving hole 1200). If the edge of the receiving hole 1200 is a non-closed ring, that is, the receiving hole 1200 has a gap in its radial direction, the formation of the gap will greatly reduce the structural strength of the inner iron core 1000. In this embodiment, by designing the edge of the receiving hole 1200 to be a closed ring, the structural strength of the inner iron core 1000 can be effectively avoided from being greatly reduced.
[0059] Combination Figure 6 As shown, in some embodiments of the present application, the minimum distance between the accommodating hole 1200 and the peripheral surface 1400 of the inner core 1000 along the radial direction is not less than 0.5 mm, thereby avoiding cracks in the portion of the inner core 1000 between the peripheral surface 1400 of the inner core 1000 and the accommodating hole 1200.
[0060] Specifically, the extension direction of the rotation axis of the rotor assembly 200 is the axial direction, and the radial plane of the rotor assembly 200 is the radial direction. The direction passing through the rotation axis in the radial plane is the radial direction. The distance between the accommodating hole 1200 and the circumferential surface 1400 of the inner iron core 1000 is measured along the radial direction. The minimum distance between the accommodating hole 1200 and the circumferential surface 1400 of the inner iron core 1000 is L1. After a large number of experiments by the inventor, it is necessary to satisfy L1≥0.5mm, for example, L1 is 0.5mm, 1mm, 1.5mm, 3mm, 5mm, etc. By limiting L1, the part of the inner iron core 1000 between the accommodating hole 1200 and the circumferential surface 1400 of the inner iron core 1000 is prevented from being too thin, thereby avoiding cracking.
[0061] Similarly, combined Figure 6 As shown, the minimum distance between the receiving hole 1200 and the shaft hole 1100 along the radial direction is not less than 1 mm, so as to avoid the inner core 1000 from being broken between the shaft hole 1100 and the receiving hole 1200 of the inner core 1000 .
[0062] As mentioned above, the inner core 1000 is provided with an axial hole 1100, and the axial hole 1100 is used for the shaft to pass through and install. There is force transmission between the inner core 1000 and the diameter of the axial hole 1100, so it is necessary to optimize the distance between the receiving hole 1200 and the axial hole 1100. The distance between the receiving hole 1200 and the axial hole 1100 is measured along the radial direction. The minimum force between the receiving hole 1200 and the axial hole 1100 is L2. After a large number of experiments by the inventor, it is necessary to satisfy L2 ≥ 1mm, for example, L2 is 1mm, 2mm, 4mm, 6mm, etc. By limiting L2, the force transmission between the inner core 1000 and the shaft is better realized, and the part of the inner core 1000 between the receiving hole 1200 and the axial hole 1100 is prevented from being too thin, thereby avoiding cracking.
[0063] Combination Figure 6 As shown, in some embodiments of the present application, the minimum radial dimension of the receiving hole 1200 through its center is not less than 1.5 mm.
[0064] For example, if the cross-section of the accommodating hole 1200 is circular, then the minimum radial dimension D of the accommodating hole 1200 through its center is the diameter of the accommodating hole 1200, and D ≥ 1.5 mm. For example, D is 1.5 mm, 2 mm, 3 mm, 4 mm, etc. By optimizing the diameter of the accommodating hole 1200, the material of the overmolded body 4000 can easily enter the accommodating hole 1200 during molding, and the formed through-hole glue portion 4100 can achieve a good combination with the inner iron core 1000 to ensure structural strength.
[0065] It is understandable that when the cross-section of the accommodating hole 1200 is non-circular, then it is necessary to satisfy the following conditions: when measuring the accommodating hole 1200 through the center of the accommodating hole 1200 and along its (referring to the accommodating hole 1200) radial direction, the accommodating hole 1200 has a minimum radial dimension D, and the radial dimension also needs to satisfy D≥1.5mm.
[0066] For example, combined with Figures 6 to 9 As shown, the cross section of the receiving hole 1200 is circular, which facilitates the arrangement of the receiving hole 1200. When the cross section of the receiving hole 1200 is circular, stress concentration can be avoided in the inner core 1000 surrounding the receiving hole 1200, thereby ensuring the structural strength of the inner core 1000. The cross section of the receiving hole 1200 is circular, that is, any cross section along the axial direction is circular, and the size of the circular cross section can be equal or unequal.
[0067] Furthermore, the cross section of the receiving hole 1200 may also be non-circular, for example, Figures 10 to 14The cross section of the receiving hole 1200 is an oval shape, and the oval shape needs to be bent to a certain extent around the center of the inner core 1000. It can be understood that the oval shape has a similar rounded profile to the circular shape, which can also avoid stress concentration, and the oval shape receiving hole 1200 is bent to a certain extent around the center of the inner core 1000 (i.e. around the rotation axis of the rotor assembly 200), so that along the circumference of the inner core 1000, relative to the circular cross-section receiving hole 1200, the oval cross-section receiving hole 1200 can occupy more space along the circumference (relatively speaking), so that the number of openings can be reduced.
[0068] In some embodiments of the present application, there are multiple accommodating holes 1200, and the multiple accommodating holes 1200 are designed to be alternately arranged along the circumference of the inner core 1000, that is, the multiple accommodating holes 1200 are alternately arranged around the rotation axis of the rotor assembly 200. In this way, in the circumference of the rotor assembly 200, the bonding force between the various components of the rotor assembly 200 is uniform, and the rotation of the rotor assembly 200 is also smoother. Multiple accommodating holes 1200 means two or more, and it is better to design the number of accommodating holes 1200 to be three or more, and at least three accommodating holes 1200 can meet the bonding force requirements. For example, Figure 7 and Fig.13 The number of the receiving holes 1200 shown is three. Figure 6 and Fig.12 The number of the receiving holes 1200 shown is four. Figure 8 and Fig.14 The number of the receiving holes 1200 shown is five. Fig. 9 The number of the accommodating holes 1200 shown is six. When the diameter of the inner core 1000 is larger, the number of the accommodating holes 1200 can be appropriately increased. When the diameter of the inner core 1000 is smaller, the number of the accommodating holes 1200 can be appropriately reduced.
[0069] It is understandable that the shapes and sizes of the multiple receiving holes 1200 may be the same or different. In the present embodiment, the multiple receiving holes 1200 are designed to be the same, where the same means the same shape and size. This further ensures the uniform distribution of the bonding force between the components, which is beneficial to further improve the structural strength of the rotor assembly 200. The design of the multiple receiving holes 1200 is the same, which also facilitates the opening of the multiple receiving holes 1200. In addition, the multiple receiving holes 1200 can be designed to be cocircular, that is, a circle is drawn through the center of the rotor assembly 200, and the circle passes through the center of each receiving hole 1200. The cocircular setting of the receiving holes 1200 is also beneficial to the uniform distribution of the bonding force between the components.
[0070] The present application also discloses a motor 100, Figure 1 and Fig.15As shown, the motor 100 includes a stator assembly (not shown in the figure) and a rotor assembly 200 of the above embodiment. The rotor assembly 200 can be rotatably arranged inside the stator assembly. The cooperation between the rotor assembly 200 and the stator assembly can be referred to the relevant technology and will not be described in detail here.
[0071] The rotor assembly 200 includes an inner core 1000, an outer core 2000, a magnetic tile 3000 and a plastic package 4000. The inner core 1000 is provided with a receiving hole 1200, and the number of the outer cores 2000 is multiple. The multiple outer cores 2000 are arranged around the inner core 1000, and the outer core 2000 needs to be designed to be spaced a certain distance from the inner core 1000, that is, the outer core 2000 and the inner core 1000 are not in contact, and magnetic tiles 3000 are arranged between adjacent outer cores 2000. The inner core 1000, the outer core 2000 and the magnetic tile 3000 are connected by the plastic package 4000. The plastic package 4000 includes a through-hole glue part 4100, and the through-hole glue part 4100 is connected in the receiving hole 1200.
[0072] The connection and fixation of the magnetic tile 3000, the outer iron core 2000 and the inner iron core 1000 are realized by the overmolding body 4000. On this basis, by setting a receiving hole 1200 on the inner iron core 1000, the through-hole glue part 4100 of the overmolding body 4000 is connected to the receiving hole 1200, so as to increase the bonding force between the overmolding body 4000 and the inner iron core 1000, the outer iron core 2000 and the magnetic tile 3000, thereby facilitating the improvement of the structural strength of the rotor assembly 200 and reducing the risk of cracking of the rotor assembly 200. It can be understood that the rotor assembly 200 of the motor 100 of this embodiment adopts the technical solution of the above embodiment, and therefore at least has the beneficial effects brought by the technical solution of the above embodiment, which will not be repeated here.
[0073] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made based on the concept of the present application and the contents of the present application description and drawings, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.
Claims
1. A rotor assembly (200), characterized in that: include: The inner iron core (1000) is provided with a receiving hole (1200); An outer iron core (2000), wherein a plurality of the outer iron cores (2000) are arranged around the inner iron core (1000), and the outer iron cores (2000) and the inner iron cores (1000) are arranged alternately; A magnetic tile (3000), wherein the magnetic tile (3000) is disposed between adjacent outer iron cores (2000); and The overmolded body (4000) connects the inner iron core (1000), the outer iron core (2000) and the magnetic tile (3000), and the overmolded body (4000) includes a through-hole glue portion (4100), and the through-hole glue portion (4100) is connected to the accommodating hole (1200).
2. The rotor assembly (200) according to claim 1, characterized in that: The accommodating hole (1200) is open at the end surface (1300) of the inner iron core (1000).
3. The rotor assembly (200) according to claim 2, characterized in that: The accommodating hole (1200) passes through two axial sides of the inner iron core (1000).
4. The rotor assembly (200) according to claim 3, characterized in that: The accommodating hole (1200) extends along the axial direction.
5. The rotor assembly (200) according to claim 1, characterized in that: The edge of the accommodating hole (1200) is in the shape of a closed ring.
6. The rotor assembly (200) according to claim 1, characterized in that: In the radial direction, the minimum distance between the accommodating hole (1200) and the peripheral surface (1400) of the inner core (1000) is L1, and L1≥0.5 mm is satisfied; Alternatively, the inner core (1000) is provided with an axial hole (1100), and the axial hole (1100) is suitable for installation of a rotating shaft. Along the radial direction, the minimum distance between the accommodating hole (1200) and the axial hole (1100) is L2, satisfying L2≥1mm.
7. The rotor assembly (200) according to claim 1, characterized in that: The minimum radial dimension of the accommodating hole (1200) through its center is D, satisfying D≥1.5 mm.
8. The rotor assembly (200) according to claim 1, characterized in that: The cross section of the receiving hole (1200) is circular; or The cross section of the accommodation hole (1200) is oval-shaped, and the oval-shaped accommodation hole (1200) is bent around the center of the inner iron core (1000).
9. The rotor assembly (200) according to claim 1, wherein the number of the accommodating holes (1200) is multiple, and the multiple accommodating holes (1200) are alternately arranged along the circumferential direction of the inner iron core (1000).
10. The rotor assembly (200) according to claim 9, characterized in that: The accommodating holes (1200) are identical; and / or the plurality of accommodating holes (1200) are arranged in a circle.
11. A motor (100), characterized in that: It comprises a stator assembly and a rotor assembly (200) according to any one of claims 1 to 10, wherein the rotor assembly (200) is rotatably arranged in the stator assembly.