Rotor core, rotor assembly, and motor

Abstract

The present invention proposes a rotor core, a rotor assembly, and a motor. The rotor core (50) includes a plurality of core units arranged around the rotation axis of the rotor core (10), with a housing space (120) defined between each of two adjacent core units, which is used to house permanent magnets, and one of the core units is a first core unit (100), which is separated from all other core units in the circumferential direction of the rotation axis, and the first core unit (100) includes a plurality of laminated sheets arranged in a stack along a direction parallel to the rotation axis, one of the laminated sheets is a first laminated sheet (110), which has a first slot (111) on its side facing the rotation axis that is recessed toward the direction away from the rotation axis.

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application with the application number 202310843129.8 and the title "Rotor Core, Rotor Assembly, and Motor" filed on July 10, 2023, and all of its contents are incorporated herein by reference.

[0002] This application relates to the technical field of motors, and particularly to rotor cores, rotor assemblies, and motors.

Background Art

[0003] Permanent magnet synchronous motors have characteristics such as high efficiency, high output density, and fast response, and are widely used in the household appliance field. In a conventional rotor core, a limiter extending along the circumferential direction is provided inside the sector unit. The above limiter can limit the position of the permanent magnet. The limiter extends along the circumferential direction and has a limiting wall surface close to the permanent magnet. The limiting wall surface is connected to the rotation axis of the rotor core through an injection molded body. In this design, in the operating state, the rotor core rotates along the circumferential direction, and since the limiting wall surface extends along the circumferential direction, the limiting wall surface is likely to have a relative displacement in the circumferential direction with respect to the injection molded body. As the rotor core rotates, the connection between the limiting wall surface and the injection molded body is likely to loosen or disconnect, affecting the performance of the rotor core.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The main object of this application is to propose a rotor core to at least partially solve one of the technical problems existing in the prior art.

Means for Solving the Problems

[0005] To achieve the above object, the embodiments of this application adopt the following technical solutions. [[ID=3�]]

[0006] A rotor core comprising a plurality of core units arranged around the rotation axis of the rotor core, wherein a housing space is defined between each of two adjacent core units, the housing space is used to house permanent magnets, and one of the core units is designated as the first core unit, and in the circumferential direction of the rotation axis, the first core unit is separated from all other core units. The first core unit includes multiple laminated sheets arranged in a stacked manner along a direction parallel to the axis of rotation, with one of each laminated sheet being designated as the first laminated sheet. The first laminated sheet has a first slot on the side facing the axis of rotation, which is recessed in a direction away from the axis of rotation.

[0007] In some embodiments, the first laminated sheet includes a first side and a second side arranged opposite each other in the circumferential direction of the axis of rotation, and the first slot is defined by three walls: a first wall, a second wall, and a third wall, which are close to the axis of rotation of the first laminated sheet, and in the circumferential direction of the axis of rotation, the first wall is connected to the first side, the second wall is connected to the second side, and the third wall is located between the first wall and the second wall. In the circumferential direction of the axis of rotation, the first slot is defined by one end of the first wall, one end of the second wall, and the third wall. and / or, The first slot includes a first slot portion and a second slot portion. In the circumferential direction of the axis of rotation, the first slot portion is defined by both the first wall surface and the end of the third wall surface near the first side edge, and the second slot portion is defined by both the second wall surface and the end of the third wall surface near the second side edge.

[0008] In some embodiments, the first laminated sheet includes a first side and a second side arranged opposite each other in the circumferential direction of the axis of rotation, the first side having a first projection at the end closer to the axis of rotation, and the first slot being provided on the side of the first projection closer to the axis of rotation.

[0009] In some embodiments, the first laminated sheet has a second slot on a side away from the axis of rotation, which is recessed in a direction approaching the axis of rotation.

[0010] In some embodiments, the first laminated sheet is arranged symmetrically with respect to a first plane, the axis of rotation lies within the first plane, and the first slots are arranged symmetrically with respect to the first plane.

[0011] In some embodiments, each laminated sheet of the first core unit has the same shape and structure. or, The number of laminated sheets in the first core unit is an even number N, and the shape of at least N / 2 laminated sheets is the same as the shape of the first laminated sheet. or, The number of laminated sheets in the first core unit is odd, M, and the shape of at least (M-1) / 2 laminated sheets is the same as the shape of the first laminated sheet.

[0012] In some embodiments, the rotor core has a second plane which is perpendicular to the axis of rotation, and each laminated sheet is arranged symmetrically with respect to the second plane and has at least one first laminated sheet on each side of the second plane in a direction parallel to the axis of rotation.

[0013] In some embodiments, each core unit is cut from one another, and each core unit is identical in shape and structure.

[0014] An embodiment of the second aspect of this application is, One of the above rotor cores, The present invention further provides a rotor assembly including a plurality of permanent magnets provided within a housing space.

[0015] An embodiment of the third aspect of this application is: One of the above rotor assemblies and The motor is further provided, including a stator assembly.

[0016] To more clearly explain the technical solutions in the embodiments of the present application or the prior art, the drawings necessary for the description of the embodiments or the prior art will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on the structures shown in these drawings without creative effort.

Brief Description of the Drawings

[0017] [Figure 1] It is a schematic side view of a rotor core in the prior art. [Figure 2] It is a schematic side view of a rotor core provided in an embodiment of the present application. [Figure 3] It is a perspective schematic view of a first core unit provided in another embodiment of the present application. [Figure 4] It is a schematic side view of a first laminated sheet provided in the embodiment shown in FIG. 2 of the present application. [Figure 5] It is an enlarged schematic view of part A in FIG. 4. [Figure 6] It is a schematic side view of a first laminated sheet provided in yet another embodiment of the present application. [Figure 7] It is an enlarged schematic view of part B in FIG. 6. [Figure 8] It is a schematic side view of a first laminated sheet in yet another embodiment of the present application. [Figure 9] It is a perspective schematic view of a first core unit provided in yet another embodiment of the present application. [Figure 10] It is a perspective schematic view of a first core unit provided in yet another embodiment of the present application. [Figure 11] It is a schematic side view of a rotor assembly provided in an embodiment of the second aspect of the present application.

Modes for Carrying Out the Invention

[0018] The achievement of the objectives, functional features, and advantages of the present application will be further described in conjunction with the embodiments and the drawings.

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments; however, obviously, the embodiments described are only a part of the embodiments of the present application, not all of them. All other embodiments that a person skilled in the art could obtain without creative effort based on the embodiments of the present application are within the scope of protection of the present application.

[0020] In the embodiments of this application, if directional indicators (e.g., up, down, left, right, front, back, etc.) are included, these directional indicators are used solely to describe the relative positional relationships and motion conditions between each component in a specific posture, and if this specific posture changes, these directional indicators will also change accordingly.

[0021] Furthermore, in the embodiments of this application, if there are descriptions of "first," "second," etc., such descriptions are for explanatory purposes only and should not be understood as indicating or implying their relative importance or the number of technical features shown. Therefore, features limited by "first," "second," etc. may explicitly or implicitly include at least one feature. Also, whereever "and / or," "and / or," or "and / or" appears in the text, their meaning includes three parallel arrangements, including, for example, "A and / or B," A or B, or arrangements where A and B are satisfied simultaneously. Furthermore, while technical solutions between each embodiment may be combined, they must be based on what a person skilled in the art could achieve, and if a combination of technical solutions is mutually contradictory or unrealistic, such a combination of technical solutions should be considered nonexistent and not included in the scope of protection claimed in this application.

[0022] Referring to Figure 1, the conventional rotor core 50 has a limiter 52 extending circumferentially inside the sector unit 51. The limiter 52 can restrict the position of the permanent magnets, and the limiter 52 extends circumferentially and has a limiting wall surface 521 close to the permanent magnets, which is connected to the rotation axis of the rotor core 50 via an injection molded body 230. In this design, when the rotor core 50 rotates circumferentially in operation, and because the limiting wall surface 521 extends circumferentially, the limiting wall surface 521 is prone to circumferential relative displacement with respect to the injection molded body 53. As the rotor core 50 rotates, the connection between the limiting wall surface 521 and the injection molded body 53 is prone to loosening or detachment, affecting the operating performance of the rotor core 50.

[0023] In view of the above, with reference to Figures 2 to 10, one embodiment of the present invention provides a rotor core 10 that can improve the connection strength between the rotor core 10 and the injection molded body 230.

[0024] The rotor core 10 includes a plurality of core units arranged around the rotation axis of the rotor core 10, with a housing space 120 defined between two adjacent core units, which is used to house permanent magnets 210, and one of the core units is designated as the first core unit 100, which is separated from all other core units in the circumferential direction of the rotation axis. In some embodiments, the plurality of core units are arranged around the rotation axis to constitute a plurality of units of the rotor core 10. Here, when viewed from a direction parallel to the rotation axis, the core units may be sector-shaped, and in the circumferential direction of the rotation axis, each core unit may be arranged at equal intervals. Exemplarily, referring to Figure 2, in this embodiment the rotor core 10 has 10 core units. A housing space 120 is defined between two adjacent core units, which is used to house permanent magnets 210. There is a gap between two adjacent core units that can accommodate the permanent magnets 210.

[0025] Referring to Figure 2, in this embodiment, the 10 core units can jointly define 10 housing spaces 120, and accordingly, the rotor assembly 300 having the rotor core 10 needs to have 10 permanent magnets 210, and the 10 permanent magnets 210 are provided in a one-to-one correspondence within the 10 housing spaces 120. In another embodiment, there may be a gap between the permanent magnets 210 and the core units, and other material may be filled between both, thereby fixing the relative positions between each permanent magnet 210 or the relative positions between the permanent magnets 210 and the core units. In a further embodiment, multiple permanent magnets 210 may be provided within a single housing space 120. Exemplarily, referring to Figure 2, the maximum radial dimension of the rotor assembly 300 of the permanent magnets 210 may correspond to the maximum radial dimension of the rotor assembly 300 of the housing space 120. According to the above configuration, the accommodation space 120 may be defined by two wall surfaces that face each other in the circumferential direction between two adjacent core units.

[0026] Each core unit of the rotor core 10 may be connected to one another to ensure the integrity of the rotor core 10, or it may be disconnected from one another to avoid magnetic flux leakage at the connection points. Exemplarily, referring to Figure 2, in this embodiment, each core unit is configured to be disconnected from one another. In some other embodiments, some of the core units are connected to one another, while each of the remaining core units is disconnected from the others.

[0027] Referring to Figures 2 and 3, one of the core units is designated as the first core unit 100. In the circumferential direction of the rotation axis, the first core unit 100 is separated from all other core units. The problem that this invention aims to solve is that while the connection / position limiting structure of the rotor core 10 causes a magnetic flux leakage effect, the above structure is necessary to improve handling in the manufacturing process. Therefore, in this invention, the description and illustration of the rotor core 10 correspond to the state of the rotor core 10 in the manufacturing process. In this embodiment, the rotor core 10 is in a state before injection molding, not assembled as a rotor assembly 300. Therefore, in some embodiments, the state in which the first core unit 100 is separated from all other core units can be understood as the first core unit 100 being placed at a distance from the other core units in the manufacturing process, but in a subsequent step, the rotor core 10 being connected and integrated by the injection molding process.

[0028] Referring to Figures 3 to 7, the first core unit 100 includes a plurality of laminated sheets arranged in a stacked manner along a direction parallel to the axis of rotation, one of which is the first laminated sheet 110. Since at least one of the laminated sheets is the first laminated sheet 110, in some embodiments, each laminated sheet of the first core unit 100 may include a plurality of first laminated sheets 110.

[0029] Corresponding to the configuration of the first projection 1121 described above, with reference to Figures 4 and 5, the first laminated sheet 110 has a first slot 111 on the side facing the axis of rotation that is recessed toward the direction away from the axis of rotation. In some embodiments, the first slot 111 may be used to fill an injection molded body 230, thereby fitting the first slot 111 with the injection molded body 230 on the side of the rotor core 10 closer to the axis of rotation to form an engagement structure.

[0030] As can be seen from the combination of embodiments described above, in some embodiments, the rotor core 10 of the embodiment of the present application includes a plurality of core units, which include a first core unit 100, the first core unit 100 having a plurality of laminated sheets, one of which is a first laminated sheet 110. The first laminated sheet 110 has a first slot 111 recessed toward the direction away from the axis of rotation on the side facing the axis of rotation. In the above configuration, the rotor core 10 may have at least one first core unit 100, and the first core unit 100 may have at least one first laminated sheet 110 having a first slot 111. Compared to the design of the straight end structure of the laminated sheet in the prior art, in the embodiment of the present invention, a first slot 111 is provided at one end of the first laminated sheet 110, so that the injection molded body 230 surrounding the first laminated sheet 110 can be filled into the first slot 111, and during the rotation of the rotor core, the first slot 111 and the injection molded body 230 fit together to form an engagement structure, improving the connection strength between the rotor core and the injection molded body 230.

[0031] With reference to Figures 4 to 7, the specific structure of the first slot 111 may, in some embodiments, include a first side 112 and a second side 113 that are positioned opposite each other in the circumferential direction of the rotation axis. The first slot 111 is defined by three walls: a first wall 1111, a second wall 1112, and a third wall 1113, all located near the rotation axis of the first laminated sheet 110. In the circumferential direction of the rotation axis, the first wall 1111 is connected to the first side 112, the second wall 1112 is connected to the second side 113, and the third wall 1113 is located between the first wall 1111 and the second wall 1112. In this embodiment, the first slot 111 is defined in the circumferential direction of the rotation axis by three elements: the first wall surface 1111 and the second wall surface 1112 located on both sides, and the third wall surface 1113 located in the middle.

[0032] Specifically, referring to Figures 4 and 5, in one embodiment, the first slot 111 may be defined in the circumferential direction of the axis of rotation by one end of the first wall surface 1111, one end of the second wall surface 1112, and the third wall surface 1113. In this embodiment, the third wall surface 1113 is recessed in the direction away from the axis of rotation, thereby defining the first slot 111 together with one end of the first wall surface 1111 and one end of the second wall surface 1112. Referring to Figures 6 and 7, in another embodiment, the first slot 111 may include a first slot portion 1114 and a second slot portion 1115. In the circumferential direction of the axis of rotation, the first slot portion 1114 is defined by the first wall surface 1111 and the end of the third wall surface 1113 near the first side edge 112, while the second slot portion 1115 is defined by the second wall surface 1112 and the end of the third wall surface 1113 near the second side edge 113. In this embodiment, the third wall surface 1113 protrudes toward the direction approaching the axis of rotation, and the first wall surface 1111 and the second wall surface 1112 are recessed toward the direction away from the axis of rotation relative to the third wall surface 1113. As a result, the recessed first wall surface 1111 and the end of the third wall surface 1113 near the first side edge 112 may define a first slot portion 1114, or the recessed second wall surface 1112 and the end of the third wall surface 1113 near the second side edge 113 may define a second slot portion 1115. Furthermore, in the above two embodiments, the first slot 111 may have a symmetric structure. Referring to Figure 8, in an embodiment of a further embodiment, the first slot 111 may have an asymmetric slot structure in the circumferential direction of the axis of rotation.

[0033] In some embodiments, the first laminated sheet 110 may have a projection structure on the side facing the axis of rotation. Specifically, referring to Figures 2 to 7, in some embodiments, the first laminated sheet 110 may include a first side 112 and a second side 113 that are arranged opposite each other in the circumferential direction of the axis of rotation. The end of the first side 112 closer to the axis of rotation may have a first projection 1121. The first side 112 has an end closer to the axis of rotation and another end further away from the axis of rotation, and these ends may be located on the same side wall or on different walls.

[0034] In some embodiments, corresponding to the configuration of the first projection 1121, the first slot 111 may be provided on the side of the first projection 1121 closer to the axis of rotation. Because the first projection 1121 has an elongated structure, the provision of the first slot 111 on the first projection 1121 can increase the size of the slot space corresponding to the first slot 111 or increase the circumferential extension length of the first slot 111. In some embodiments, the first projection 1121 can also restrict the displacement of the permanent magnet 210 in the direction approaching the axis of rotation. By abutting the end of the permanent magnet 210 away from the axis of rotation, the first projection 1121 restricts the displacement of the permanent magnet 210 and facilitates the mounting and connection of the permanent magnet 210 to the rotor core 10. Regarding the structure of the first projection 1121, the first projection 1121 may extend along a first circumferential direction. The first projection 1121 is close to the permanent magnet 210 and may have a contact end face for contacting the permanent magnet 210, and the contact end face may be a flat or curved surface.

[0035] The method by which the first projection 1121 contacts the permanent magnet 210 may be direct contact or indirect contact. Specifically, in some embodiments, the first projection 1121 may contact the permanent magnet 210. In some other embodiments, there is a filler between the first projection 1121 and the permanent magnet 210, and the first projection 1121 may contact the filler, and the filler may further contact the permanent magnet 210. For the sake of clarity, the following description will focus on an embodiment in which the first projection 1121 is provided on the first side 112 of the first laminated sheet 110, the first slot 111 may be provided on the side closest to the rotation axis of the first projection 1121, and the first projection 1121 directly contacts the permanent magnet 210. However, different embodiments may be combined in different technical solutions.

[0036] Referring to Figures 3 to 5, corresponding to the configuration of the first projection 1121 described above, the first side 112 and the second side 113 may each be located on both sides in the circumferential direction of the first laminated sheet 110. In some embodiments, the first side 112 and the second side 113 may each be used to demarcate adjacent different accommodation spaces 120. Referring to Figure 4, in some embodiments, the first side 112 (or the second side 113) may be a side of a wall surface on the same side of the first laminated sheet 110. In this embodiment, the first projection 1121 is located on a wall surface on the same side of the first laminated sheet 110. In some other embodiments, the first side 112 or the second side 113 may be a side of a multi-stage wall surface of the first laminated sheet 110. In this embodiment, the first projection 1121 is located on a side formed on a multi-stage wall surface of the first laminated sheet 110.

[0037] In some embodiments, the first laminated sheet 110 is also connected to the injection-molded body 230 on the side away from the axis of rotation. Therefore, referring to Figure 8, in some embodiments, the first laminated sheet 110 may have a second slot on the side away from the axis of rotation that is recessed toward the direction approaching the axis of rotation. In this embodiment, the configuration of the second slot may correspond to the configuration of the first slot 111, but differs in that the second slot and the injection-molded body 230 on the side away from the axis of rotation of the rotor core 10 can fit together to form an engagement structure.

[0038] Therefore, in some embodiments, the first side 112 further has a second projection at the end away from the axis of rotation. With regard to the placement of the second projection, one can refer to the above-described placement of the first projection 1121. Furthermore, in some embodiments, the second slot may be provided on the side of the second projection away from the axis of rotation.

[0039] Referring to Figure 3, in some embodiments, the first laminated sheet 110 is arranged symmetrically with respect to a first plane P1, the axis of rotation is located within the first plane P1, and the first slot 111 is arranged symmetrically with respect to the first plane P1. The first plane P1 extends along a direction parallel to the axis of rotation, and the first plane P1 is the plane corresponding to the central dividing line of the first laminated sheet 110. When the first laminated sheet 110 is arranged symmetrically with respect to the first plane P1, or when the first slot 111 is arranged symmetrically with respect to the first plane P1, the design and manufacturing of the first laminated sheet 110 becomes easier, and the symmetrical design can reduce the corresponding design and manufacturing costs of the first laminated sheet 110.

[0040] Referring to Figure 3, in some other embodiments, the structure of each laminated sheet of the first core unit 100 is not exactly the same. Specifically, when the number of laminated sheets of the first core unit 100 is even N, the shape of at least N / 2 laminated sheets (including the first laminated sheet 110) is the same as the shape of the first laminated sheet 110. Exemplaryly, when the first core unit 100 has 20 laminated sheets, the structure of at least 10 laminated sheets (including the first laminated sheet 110) is the same as the shape of the first laminated sheet 110 (the shape of the first laminated sheet 110 may correspond to the shape of a laminated sheet having the first slot 111). Alternatively, when the number of laminated sheets of the first core unit 100 is odd M, the shape of at least (M-1) / 2 laminated sheets (including the first laminated sheet 110) is the same as the shape of the first laminated sheet 110. For example, if the first core unit 100 has 21 laminated sheets, the structure of at least 10 laminated sheets (including the first laminated sheet 110) is the same as the shape of the first laminated sheet 110. In the above configuration, each laminated sheet of the first core unit 100 has a certain number of slot structures (including the first slot 111), which contributes to increasing the connection strength between the rotor core 10 and the injection molded body 230 across multiple laminated sheets.

[0041] To ensure more reliable fixation and positional restriction of the rotor core 10 relative to the permanent magnet 210, in some embodiments, at least one of two adjacent laminated sheets has a slot structure (including a first slot 111) on the side facing the axis of rotation.

[0042] In some embodiments, at least one first laminated sheet 110 has slot structures on both the side facing the axis of rotation and the side away from the axis of rotation. In the above configuration, the number of laminated sheet structures located at both ends of the permanent magnet 210 and asymmetrical to each other can be reduced, thereby improving the versatility of the laminated sheet, reducing the number of molds for the laminated sheet, and lowering the manufacturing cost of the laminated sheet.

[0043] Referring to Figure 3, in some embodiments, the rotor core may have a second plane P2, which is perpendicular to the axis of rotation, and each laminated sheet is arranged symmetrically with respect to the second plane P2. In some embodiments, there is at least one first laminated sheet 110 on each side of the second plane P2 in a direction parallel to the axis of rotation. In a direction parallel to the axis of rotation, the multiple laminated sheets are distributed symmetrically with respect to the second plane P2 (if the total number of laminated sheets is odd, the second plane P2 may penetrate the intermediate laminated sheets). In a direction parallel to the axis of rotation, the multiple laminated sheets may be distributed on both sides of the second plane P2 (they may be distributed evenly or unevenly), and at least one laminated sheet on each side is the first laminated sheet 110. In the above configuration, the first slot 111 can be located on both sides of the permanent magnet 210 in a direction parallel to the axis of rotation, thereby making the engagement action by the first slot 111 more reliable.

[0044] Referring to Figures 9 to 10, in some embodiments, laminated sheets having a slot structure that is recessed in the direction away from the rotation axis along a direction parallel to the rotation axis, and other laminated sheets without a slot structure, may be alternately laminated, thereby increasing the connection strength between the rotor core 10 and the injection molded body 230, saving some material, and reducing production and manufacturing costs.

[0045] Regarding the arrangement of the multiple core units, in some embodiments, all of the core units may be disconnected from each other. In the above configuration, there are no connecting structures between the multiple core units, thereby reducing the magnetic flux leakage effect. In some embodiments, each core unit may be the same in shape and structure. In the above configuration, the first core unit 100 and multiple core units that are the same (or similar) in shape and structure as the first core unit 100 may be arranged around the rotation axis of the rotor core 10, and the first core unit 100 has a corresponding projection limiting structure, thereby facilitating the mounting of multiple permanent magnets 210 in the housing space 120 along the circumferential direction of the rotation axis.

[0046] Referring to Figure 4, in some embodiments, the rotor core 10 may include positioning holes to facilitate subsequent machining and manufacturing of the rotor assembly 300. The positioning holes may be used to fix the position of the rotor core 10, thereby facilitating the manufacturing of the rotor assembly 300. The shape of the positioning holes may be circular, rectangular, trapezoidal, or polygonal. In some embodiments, the rotor core 10 may further include injection molding holes. The provision of injection molding holes facilitates the injection molding of the rotor core 10, permanent magnets 210, and rotating shaft 220 as a single unit. The gaps between each core unit of the rotor core 10, and the gap between the rotor core 10 and the rotating shaft 220 may be filled with injection molded parts 230.

[0047] Referring to Figure 11, an embodiment of a second aspect of the present application further provides a rotor assembly 200, which includes the rotor core 10 in any of the above embodiments, and further includes a plurality of permanent magnets 210, or a rotating shaft 220, or an injection-molded body 230. The plurality of permanent magnets 210 may be provided within the housing space 120, and various configurations thereof may refer to the above. The rotating shaft 220 may be provided in the center of the rotor core 10, and the axis of the rotating shaft 220 may coincide with the rotation axis. The injection-molded body 230 covers the outside of the rotor core 10, and the injection-molded body 230 may fill the gap between the rotor core 10 and the rotating shaft 220. The injection-molded body 230 may be connected to the rotating shaft 220 and the rotor core 10, respectively. Regarding the connection configuration of the injection-molded bodies 230, in some embodiments, when the units of the rotor core 10 are separated from each other, the injection-molded bodies 230 may cover the outside of the rotor core 10, or the injection-molded bodies 230 may fill the gap between the rotor core 10 and the rotating shaft 220, thereby connecting the injection-molded bodies 230 to the rotating shaft 220 and the rotor core 10, respectively. In some embodiments, the rotating shaft 220 may be connected indirectly to each core unit 100 via the injection-molded bodies 230 rather than directly.

[0048] In the process of specifically manufacturing the rotor assembly 200 described above, first, the relative position between the rotating shaft 220 and the rotor core 10 is determined, and then injection molding is performed on the outside of both combinations to form an injection-molded body 230. The injection-molded body 230 covers the outer wall surface of the rotor core 10 and fills the gap between the rotating shaft 220 and the rotor core 10, thereby achieving the objective of fixing the rotating shaft 220 and the rotor core 10. Before the injection molding step described above, the permanent magnets 210 can also be installed in the housing space 120 to form the rotor assembly 200 as a single unit and to more stably mount the permanent magnets 210.

[0049] A third embodiment of the present application provides a motor which includes a rotor assembly 200 and a stator assembly in any of the above embodiments.

[0050] The foregoing are merely some embodiments of the present application and do not limit the scope of the patent. Any equivalent structural transformations or other direct / indirect applications to related technical fields made using the contents of the specification and drawings of the present application under the concept of the present application shall all be included within the scope of the patent protection of the present application. [Explanation of symbols]

[0051] 50 rotor cores 51 Sector Units 52 Limiter 521 Restrictive wall 53 Injection molded body 10 rotor cores 100 First Core Unit 110 First Laminate Sheet 111 1st slot 1111 First Wall 1112 Second Wall 1113 Third Wall 1114 First Slot Section 1115 Second slot section 112 1st side 1121 1st protrusion 113 Second side 114 2nd slot 120 Containment space P1 1st plane P2 2nd plane 200 Rotor Assembly 210 Permanent Magnets 220 Rotation axis 230 Injection molded body

Claims

1. A rotor core comprising a plurality of core units arranged around the rotation axis of the rotor core, wherein a housing space is defined between each of two adjacent core units, and the housing space is used to house permanent magnets. One of the aforementioned core units is designated as the first core unit. In the circumferential direction of the rotation axis, the first core unit is separated from all other core units. The first core unit includes a plurality of laminated sheets arranged in a stack along a direction parallel to the axis of rotation, One of the aforementioned laminated sheets is designated as the first laminated sheet. The first laminated sheet has a first slot on the side facing the axis of rotation that is recessed in a direction away from the axis of rotation. Rotor core.

2. The first laminated sheet includes a first side and a second side arranged opposite to each other in the circumferential direction of the rotation axis, The first slot is defined by a first wall surface, a second wall surface, and a third wall surface of the first laminated sheet, which are close to the axis of rotation, and in the circumferential direction of the axis of rotation, the first wall surface is connected to the first side, the second wall surface is connected to the second side, and the third wall surface is located between the first wall surface and the second wall surface. In the circumferential direction of the rotation axis, the first slot is defined by one end of the first wall surface, one end of the second wall surface, and the third wall surface. and / or, The first slot includes a first slot portion and a second slot portion, and in the circumferential direction of the rotation axis, the first slot portion is defined by both the first wall surface and the end of the third wall surface near the first side edge, and the second slot portion is defined by both the second wall surface and the end of the third wall surface near the second side edge. The rotor core according to claim 1.

3. The first laminated sheet includes a first side and a second side arranged opposite to each other in the circumferential direction of the rotation axis, The first side has a first projection at the end closest to the axis of rotation, The first slot is provided on the side of the first projection that is close to the axis of rotation. The rotor core according to claim 1 or 2.

4. The first laminated sheet has a second slot on a side away from the axis of rotation, which is recessed in a direction approaching the axis of rotation. A rotor core according to any one of claims 1 to 3.

5. The first laminated sheet is arranged symmetrically with respect to the first plane, The axis of rotation is located in the first plane, The first slot is arranged symmetrically with respect to the first plane. A rotor core according to any one of claims 1 to 4.

6. Each of the laminated sheets in the first core unit has the same shape and structure. or, The number of laminated sheets in the first core unit is an even number N, and the shape of at least N / 2 of the laminated sheets is the same as the shape of the first laminated sheet. or, The number of laminated sheets in the first core unit is odd, and the shape of at least (M-1) / 2 of the laminated sheets is the same as the shape of the first laminated sheet. A rotor core according to any one of claims 1 to 5.

7. It has a second plane, the second plane being perpendicular to the axis of rotation, Each of the laminated sheets is arranged symmetrically with respect to the second plane, and has at least one of the first laminated sheets on each side of the second plane in a direction parallel to the axis of rotation. A rotor core according to any one of claims 1 to 6.

8. Each of the aforementioned core units is separated from each other, Each of the aforementioned core units has the same shape and structure. A rotor core according to any one of claims 1 to 7.

9. A rotor core according to any one of claims 1 to 8, A plurality of permanent magnets provided within the aforementioned containment space, Rotor assembly.

10. The rotor assembly according to claim 9, Stator assembly and, Motor.

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