Rotor core, rotor assembly and motor

Abstract

The invention provides a rotor iron core, a rotor assembly and a motor, the rotor iron core comprises a plurality of iron core units arranged around the rotation axis of the rotor iron core, an accommodating space is defined between two adjacent iron core units, the accommodating space is used for accommodating a permanent magnet, one of the iron core units is a first iron core unit, and the other iron core unit is a second iron core unit in the circumferential direction of the rotation axis. The first iron core unit is disconnected from the other iron core units; the first iron core unit comprises a plurality of laminations which are laminated in the direction parallel to the rotating axis, and one of the laminations is a first lamination; the side edge, facing the rotating axis, of the first lamination is provided with a first groove body sunken in the direction away from the rotating axis. According to the invention, the first groove body is arranged at one end of the first lamination, so that the injection molding body around the first lamination can be filled into the first groove body, the first groove body and the injection molding body are matched to form a clamping structure in the rotation process of the rotor iron core, and the connection tightness between the rotor iron core and the injection molding body is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor core, a rotor assembly and a motor. Background Art

[0002] Permanent magnet synchronous motors have the characteristics of high efficiency, high power density and fast response, and are widely used in the field of household appliances. An existing rotor core is provided with a limiter extending in the circumferential direction on the inner side of the fan-shaped unit. The above-mentioned limiter can limit the permanent magnet, and the limiter has a limiter wall extending in the circumferential direction and close to the permanent magnet, and the limiter wall is connected to the rotation axis of the rotor core through an injection molded body. Under this design, since the rotor core rotates in the circumferential direction and the limiter wall extends in the circumferential direction when in the working state, the limiter wall is easy to produce relative displacement in the circumferential direction with the injection molded body. As the rotor core rotates, the connection between the limiter wall and the injection molded body is easy to loosen or detach, which will affect the performance of the rotor core. Summary of the invention

[0003] The main purpose of the present invention is to provide a rotor core which can enhance the tightness of the connection between the rotor core and the injection molded body.

[0004] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0005] A rotor core comprises a plurality of core units arranged around a rotation axis of the rotor core, a receiving space is defined between each two adjacent core units, the receiving space is used to receive a permanent magnet, one of the core units is a first core unit, and the first core unit is disconnected from the other core units along the circumferential direction of the rotation axis;

[0006] The first core unit includes a plurality of laminations stacked in a direction parallel to the rotation axis, one of the laminations being a first lamination;

[0007] The side of the first laminate facing the rotation axis has a first groove body which is recessed in a direction away from the rotation axis.

[0008] In some embodiments, the first lamination includes a first side and a second side that are arranged opposite to each other along the circumference of the rotation axis, and the first slot body is defined by a first wall surface, a second wall surface, and a third wall surface of the first lamination close to the rotation axis. Along the circumference of the rotation axis, the first wall surface is connected to the first side surface, the second wall surface is connected to the second side surface, and the third wall surface is located between the first wall surface and the second wall surface;

[0009] Along the circumferential direction of the rotation axis, the first slot body is defined by one end of the first wall surface, one end of the second wall surface and the third wall surface.

[0010] and / or,

[0011] The first groove body includes a first groove portion and a second groove portion. Along the circumferential direction of the rotation axis, the first groove portion is defined by the first wall surface and an end of the third wall surface close to the first side edge, and the second groove portion is defined by the second wall surface and an end of the third wall surface close to the second side edge.

[0012] In some embodiments, the first lamination includes a first side and a second side arranged opposite to each other along the circumference of the rotation axis, the first side has a first protrusion at one end close to the rotation axis, and the first groove is arranged on the side of the first protrusion close to the rotation axis.

[0013] In some embodiments, the side of the first laminate away from the rotation axis has a second groove body that is recessed toward the rotation axis.

[0014] In some embodiments, the first laminations are symmetrically arranged with respect to a first plane, the rotation axis is located in the first plane, and the first slot body is symmetrically arranged with respect to the first plane.

[0015] In some embodiments, the shapes and structures of the laminations of the first core unit are the same;

[0016] or,

[0017] The number of laminations of the first core unit is an even number N, and the shapes of at least N / 2 laminations are the same as the shape of the first lamination;

[0018] or,

[0019] The number of laminations of the first core unit is an odd number M, and the shapes of at least (M-1) / 2 laminations are the same as the shape of the first lamination.

[0020] In some embodiments, the rotor core has a second plane, the second plane is perpendicular to the rotation axis, the laminations are symmetrically arranged about the second plane, and along the direction parallel to the rotation axis, there is at least one first lamination on both sides of the second plane.

[0021] In some embodiments, the core units are disconnected from each other, and the shapes and structures of the core units are the same.

[0022] The embodiment of the second aspect of the present invention further provides a rotor assembly, comprising:

[0023] A rotor core according to any of the above;

[0024] A plurality of permanent magnets are arranged in the accommodating space.

[0025] The third aspect of the present invention further provides a motor, comprising:

[0026] A rotor assembly as claimed in any one of the preceding claims; and

[0027] Stator assembly.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The rotor core of the present invention comprises a plurality of core units, including a first core unit, the first core unit having a plurality of laminations, one of which is a first lamination, and the side of the first lamination facing the rotation axis has a first slot body that is recessed in a direction away from the rotation axis. Compared with the flat lamination end structure design in the prior art, the present invention provides a first slot body at one end of the first lamination, so that the injection molded body around the first lamination can be filled into the first slot body, so that during the rotation of the rotor core, the first slot body and the injection molded body cooperate to form a clamping structure, thereby enhancing the tightness of the connection between the rotor core and the injection molded body. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1 It is a side view schematic diagram of a rotor core in the prior art;

[0032] Figure 2 A schematic side view of a rotor core provided in a first embodiment of the present invention;

[0033] Figure 3 It is a three-dimensional schematic diagram of a first core unit provided in a second embodiment of the present invention;

[0034] Figure 4 A side view schematic diagram of a first laminate provided in a first embodiment of the present invention;

[0035] Figure 5 for Figure 4 The enlarged schematic diagram of point A in the middle;

[0036] Figure 6 A schematic side view of a first laminate provided in a third embodiment of the present invention;

[0037] Figure 7 for Figure 6 The enlarged schematic diagram of point B in the middle;

[0038] Figure 8 is a side view schematic diagram of a first laminate in a fourth embodiment of the present invention;

[0039] Fig. 9It is a three-dimensional schematic diagram of a first core unit provided in a fifth embodiment of the present invention;

[0040] Fig.10 It is a three-dimensional schematic diagram of a first core unit provided in a sixth embodiment of the present invention;

[0041] Fig.11 A schematic side view of a rotor assembly is provided for an embodiment of another aspect of the present invention.

[0042] Description of Figure Numbers:

[0043] 50- rotor core; 51- sector unit; 52- limiter; 521- limiter wall; injection molding body 53;

[0044] 10- rotor core;

[0045] 100-a first core unit;

[0046] 110-first lamination; 111-first tank body; 1111-first wall surface; 1112-second wall surface; 1113-

[0047] The third wall; 1114 - the first groove; 1115 - the second groove; 112 - the first side; 1121 - the first protrusion;

[0048] 113 - second side; 114 - second tank body;

[0049] 120-accommodation space;

[0050] P1-first plane; P2-second plane;

[0051] 200 - rotor assembly; 210 - permanent magnet; 220 - rotating shaft; 230 - injection molded body.

[0052] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0055] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "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 limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or", "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, scheme A or B, and schemes that satisfy A or B at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. 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 the present invention.

[0056] See also Figure 1 In an existing rotor core 50, a limiting body 52 extending in the circumferential direction is provided on the inner side of the sector unit 51. The limiting body 52 can limit the permanent magnet, and the limiting body 52 has a limiting wall 521 extending in the circumferential direction and close to the permanent magnet, and the limiting wall 521 is connected to the rotation axis of the rotor core 50 through the injection molding body 230. Under this design, since the rotor core 50 rotates in the circumferential direction and the limiting wall 521 extends in the circumferential direction when in the working state, the limiting wall 521 is easy to produce relative displacement in the circumferential direction with the injection molding body 53. With the rotation movement of the rotor core 50, the connection between the limiting wall 521 and the injection molding body 53 is easy to loosen or detach, thereby affecting the performance of the rotor core 50.

[0057] In view of this, see Figure 2-Figure 10 An embodiment of the present invention provides a rotor core 10 that can improve the connection tightness between the rotor core 10 and the injection molded body 230.

[0058] The rotor core 10 includes a plurality of core units arranged around the rotation axis of the rotor core 10. An accommodation space 120 is defined between two adjacent core units. The accommodation space 120 is used to accommodate the permanent magnet 210. One of the core units is a first core unit 100. The first core unit 100 is disconnected from the other core units along the circumferential direction of the rotation axis. It can be understood that in some embodiments, a plurality of core units are arranged around the rotation axis to form a plurality of unit bodies of the rotor core 10. Among them, when observed in a direction parallel to the rotation axis, the core units can be fan-shaped, and the core units can be arranged at equal intervals along the circumferential direction of the rotation axis. For example, see Figure 2 In this embodiment, the rotor core 10 has ten core units. An accommodation space 120 is defined between two adjacent core units, and the accommodation space 120 is used to accommodate the permanent magnet 210. It can be understood that there is a gap between two adjacent core units that can accommodate the permanent magnet 210.

[0059] See also Figure 2 In this embodiment, ten core units can jointly define ten accommodating spaces 120, so that the rotor assembly 300 having the rotor core 10 needs to be correspondingly provided with ten permanent magnets 210, and the ten permanent magnets 210 are arranged one by one in the ten accommodating spaces 120. In another embodiment, there can also be a gap between the permanent magnet 210 and the core unit, and other materials can be filled between the two, so that the relative position between each permanent magnet 210 is fixed, or the relative position between the permanent magnet 210 and the core unit is fixed. In yet another embodiment, a plurality of permanent magnets 210 can also be correspondingly arranged in a single accommodating space 120. For example, see Figure 2 The maximum radial dimension of the permanent magnet 210 along the rotor assembly 300 may correspond to the maximum radial dimension of the accommodation space 120 along the rotor assembly 300. According to the above configuration, the accommodation space 120 may be defined by two circumferentially opposite wall surfaces between two adjacent core units.

[0060] The core units in the rotor core 10 may be connected to each other to maintain the integrity of the rotor core 10, or may be disconnected from each other to avoid magnetic leakage at the connection. Figure 2 In this embodiment, each core unit is disconnected from each other. In other embodiments, a portion of the core units are connected to each other, and each core unit in another portion of the core units is disconnected from each other core unit.

[0061] See also Figure 2-Figure 3, one of the core units is the first core unit 100. Along the circumferential direction of the axis of rotation, the first core unit 100 is disconnected from the other core units. It should be noted that, since the problem to be solved by the present invention is the leakage magnetic effect caused by the connection / limiting structure of the rotor core 10 and the above structure is required in the manufacturing process to improve manufacturability, the description and illustrations of the rotor core 10 in the present invention 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 being assembled into the rotor assembly 300 and before injection molding. Therefore, in some embodiments, the state in which the first core unit 100 is disconnected from the other core units can be understood as the first core unit 100 being arranged separately from the other core units during the manufacturing process, and the rotor core 10 can be connected as a whole by injection molding in subsequent steps.

[0062] See also Figure 3-Figure 7 The first core unit 100 includes a plurality of laminations stacked in a direction parallel to the rotation axis, and one of the laminations is a first lamination 110. It can be understood that at least one of the laminations is a first lamination 110, so in some embodiments, each lamination in the first core unit 100 may include a plurality of first laminations 110.

[0063] Corresponding to the arrangement of the first protrusion 1121 described above. Figure 4-Figure 5 The side of the first lamination 110 facing the rotation axis has a first slot 111 that is recessed in a direction away from the rotation axis. In some embodiments, the first slot 111 can be used to fill the injection molding 230, so that the first slot 111 can cooperate with the injection molding 230 on the side of the rotor core 10 close to the rotation axis to form a clamping structure.

[0064] According to the combination of the above embodiments, it can be concluded that in some embodiments, the rotor core 10 of the present invention includes a plurality of core units, including a first core unit 100, the first core unit 100 has a plurality of laminations, one of which is a first lamination 110. The side of the first lamination 110 facing the rotation axis has a first slot body 111 that is recessed in a direction away from the rotation axis. It can be understood that the above arrangement can make the rotor core 10 have at least one first core unit 100, and the first core unit 100 includes at least one first lamination 110 having a first slot body 111. Compared with the flat lamination end structure design in the prior art, the present invention sets a first slot body 111 at one end of the first lamination 110, so that the injection molding body 230 around the first lamination 110 can be filled into the first slot body 111, so that during the rotation of the rotor core, the first slot body 111 and the injection molding body 230 cooperate to form a clamping structure, thereby enhancing the tightness of the connection between the rotor core and the injection molding body 230.

[0065] For the specific structure of the first tank body 111. Figure 4-Figure 7 In some embodiments, the first lamination 110 may include a first side 112 and a second side 113 that are arranged opposite to each other along the circumference of the rotation axis. The first slot body 111 is defined by a first wall 1111, a second wall 1112, and a third wall 1113 of the first lamination 110 close to the rotation axis, along the circumference 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. It can be understood that in this embodiment, along the circumference of the rotation axis, the first slot body 111 is defined by the first wall 1111 and the second wall 1112 located on both sides, and the third wall 1113 located in the middle.

[0066] For details, see Figure 4-Figure 5 In one embodiment, along the circumference of the rotation axis, the first slot body 111 can be defined by one end of the first wall 1111, one end of the second wall 1112, and the third wall 1113. It can be understood that in this embodiment, the third wall 1113 is recessed in a direction away from the rotation axis, so that the first slot body 111 can be defined together with one end of the first wall 1111 and one end of the second wall 1112. Figure 6-Figure 7 In another embodiment, the first groove body 111 may include a first groove portion 1114 and a second groove portion 1115. Along the circumferential direction of the rotation axis, the first groove portion 1114 is defined by the first wall surface 1111 and an end of the third wall surface 1113 close to the first side edge 112, and the second groove portion 1115 is defined by the second wall surface 1112 and an end of the third wall surface 1113 close to the second side edge 113. It can be understood that in this embodiment, the third wall surface 1113 is convex in the direction close to the rotation axis, and the first wall surface 1111 and the second wall surface 1112 are concave relative to the third wall surface 1113 in the direction away from the rotation axis. Thus, the relatively concave first wall surface 1111 and the end of the third wall surface 1113 close to the first side edge 112 can jointly define a first groove portion 1114, and the relatively concave second wall surface 1112 and the end of the third wall surface 1113 close to the second side edge 113 can jointly define a second groove portion 1115. Further, the first groove bodies 111 of the above two aspects can be symmetrical structures. Figure 8 In another embodiment, along the circumference of the rotation axis, the first slot body 111 may have an asymmetric slot body structure.

[0067] In some embodiments, the side of the first laminate 110 facing the rotation axis may have a convex structure. Figure 2-Figure 7In some embodiments, the first laminate 110 may include a first side 112 and a second side 113 that are arranged opposite to each other along the circumference of the rotation axis. The first side 112 may have a first protrusion 1121 at one end close to the rotation axis. It is understood that the first side 112 has one end close to the rotation axis and the other end away from the rotation axis, and the two ends may be located on the wall of the same side or on different wall surfaces.

[0068] Regarding the arrangement of the first protrusion 1121. In some embodiments, the first slot body 111 can be arranged on the side of the first protrusion 1121 close to the rotation axis. Since the first protrusion 1121 has an extension structure, the first slot body 111 can be arranged on the first protrusion 1121 to increase the corresponding slot body space of the first slot body 111, or the extension length of the first slot body 111 along the circumferential direction can be expanded. In some embodiments, the first protrusion 1121 can also be used to limit the displacement of the permanent magnet 210 in the direction close to the rotation axis. It can be understood that the first protrusion 1121 is used to abut against one end of the permanent magnet 210 away from the rotation axis, so as to limit the displacement of the permanent magnet 210 and facilitate the installation and connection of the permanent magnet 210 to the rotor core 10. Regarding the structure of the first protrusion 1121. The first protrusion 1121 can extend along the first circumferential direction. The first protrusion 1121 can have an abutting end face close to the permanent magnet 210 and used to abut against the permanent magnet 210, and the abutting end face can be a plane or a curved surface.

[0069] It should be noted that the first protrusion 1121 can be directly or indirectly abutted against the permanent magnet 210. Specifically, in some embodiments, the first protrusion 1121 can be used to contact and abut against the permanent magnet 210; in other embodiments, there is a filler between the first protrusion 1121 and the permanent magnet 210, the first protrusion 1121 can abut against the filler, and the filler can further abut against the permanent magnet 210. For ease of description, the following embodiment is used as an illustration in which the first side 112 of the first laminate 110 is provided with the first protrusion 1121, the first slot 111 can be provided on the side of the first protrusion 1121 close to the rotation axis, and the first protrusion 1121 directly abuts against the permanent magnet 210, and different embodiments can be combined with each other between different technical solutions.

[0070] See also Figure 3-Figure 5 , corresponding to the arrangement of the first protrusion 1121. The first side edge 112 and the second side edge 113 may be located on both sides of the first laminate 110 along the circumferential direction. In some embodiments, the first side edge 112 and the second side edge 113 may be used to define adjacent different accommodation spaces 120. Figure 4In some embodiments, the first side 112 (or the second side 113) may be a side on the wall on the same side of the first stack 110. It is understandable that in this embodiment, the first protrusion 1121 is located on the wall on the same side of the first stack 110. In other embodiments, the first side 112 or the second side 113 may be a side on multiple sections of the wall of the first stack 110. It is understandable that in this embodiment, the first protrusion 1121 is located on the side formed by multiple sections of the wall of the first stack 110.

[0071] In some embodiments, the side of the first laminate 110 away from the rotation axis is also connected to the injection molded body 230. Figure 8 In some embodiments, the side of the first lamination 110 away from the rotation axis may have a second slot body that is recessed toward the rotation axis. It is understandable that in this embodiment, the arrangement of the second slot body may correspond to the arrangement of the first slot body 111, except that the second slot body can cooperate with the injection molding body 230 on the side of the rotor core 10 away from the rotation axis to form a clamping structure.

[0072] Accordingly, in some embodiments, the first side 112 may have a second protrusion at one end away from the rotation axis. The second protrusion may be arranged with reference to the arrangement of the first protrusion 1121. In some embodiments, the second groove may be arranged on the side of the second protrusion away from the rotation axis.

[0073] See also Figure 3 In some embodiments, the first stack 110 is symmetrically arranged about the first plane P1, the rotation axis is located in the first plane P1, and the first slot 111 is symmetrically arranged about the first plane P1. It can be understood that the first plane P1 extends in a direction parallel to the rotation axis, and the first plane P1 is a plane corresponding to the central dividing line of the first stack 110. When the first stack 110 is symmetrically arranged about the first plane P1, or the first slot 111 is symmetrically arranged about the first plane P1, it is more convenient to design and manufacture the first stack 110, and the symmetrical design can reduce the corresponding design cost and processing cost of the first stack 110.

[0074] See also Figure 3In other embodiments, the structures of the laminations in the first core unit 100 are not completely the same. Specifically, when the number of laminations of the first core unit 100 is an even number N, at least N / 2 laminations (including the first lamination 110) have the same shape as the first lamination 110. Exemplarily, when the first core unit 100 has twenty laminations, at least ten laminations (including the first lamination 110) have the same shape as the first lamination 110 (the shape of the first lamination 110 may correspond to the shape of the lamination having the first slot 111). Alternatively, when the number of laminations of the first core unit 100 is an odd number M, at least (M-1)2 / laminations (including the first lamination 110) have the same shape as the first lamination 110. Exemplarily, when the first core unit 100 has twenty-one laminations, at least ten laminations (including the first lamination 110) have the same shape as the first lamination 110. It is understandable that the above arrangement can make each lamination in the first core unit 100 have a certain number of slot structures (including the first slot 111), so that the connection tightness between the rotor core 10 and the injection molded body 230 can be enhanced by multiple laminations.

[0075] In order to make the fixing and limiting effect of the rotor core 10 on the permanent magnet 210 more reliable, in some embodiments, at least one of the two adjacent laminations has a slot structure (including a first slot 111) on the side facing the rotation axis.

[0076] In some embodiments, at least one first laminate 110 has a slot structure on its side facing the rotation axis and on its side away from the rotation axis. The above arrangement can reduce the number of laminate structures located at both ends of the permanent magnet 210 and asymmetric to each other, thereby increasing the versatility of the laminate, reducing the number of molds for the laminate, and reducing the manufacturing cost of the laminate.

[0077] See also Figure 3 In some embodiments, the rotor core may have a second plane P2, the second plane P2 is perpendicular to the rotation axis, and each lamination is symmetrically arranged about the second plane P2. In some embodiments, along the direction parallel to the rotation axis, there is at least one first lamination 110 on both sides of the second plane P2. It can be understood that along the direction parallel to the rotation axis, multiple laminations are symmetrically distributed relative to the second plane P2 (when the total number of laminations is an odd number, the second plane P2 can pass through the lamination located in the middle). It can be understood that along the direction parallel to the rotation axis, multiple laminations can be distributed on both sides of the second plane P2 (can be evenly distributed or unevenly distributed), and at least one lamination on each side is a first lamination 110. The above-mentioned arrangement can enable the first slot body 111 to be correspondingly located on both sides of the permanent magnet 210 along the direction parallel to the rotation axis, so that the clamping effect of the first slot body 111 is more stable.

[0078] See also Figure 9-10 In some embodiments, along a direction parallel to the rotation axis, laminations having a slot structure that is recessed in a direction away from the rotation axis can be alternately stacked with other laminations that do not have a slot structure, thereby strengthening the connection tightness between the rotor core 10 and the injection molded body 230, saving materials to a certain extent, and reducing production costs.

[0079] For the arrangement of multiple core units. In some embodiments, each core unit can be disconnected from each other. It is understandable that the above-mentioned arrangement can make the multiple core units have no connection structure with each other, thereby reducing the leakage magnetic effect. In some embodiments, the shape and structure of each core unit can be the same. It is understandable that the above-mentioned arrangement can make the first core unit 100 and multiple core units with the same (or similar) shape and structure as the first core unit 100 arranged around the rotation axis of the rotor core 10, and the first core unit 100 has a corresponding protruding limiting structure, so that it is convenient to install multiple permanent magnets 210 in the accommodating space 120 along the circumference of the rotation axis.

[0080] See also Figure 4 , in order to facilitate the subsequent processing and manufacturing of the rotor assembly 300. In some embodiments, the rotor core 10 may include a positioning hole. The positioning hole can be used to fix the position of the rotor core 10, so as to facilitate the manufacture of the rotor assembly 300. The shape of the positioning hole can be one of a circle, a rectangle, a trapezoid or a polygon. In some embodiments, the rotor core 10 may also include an injection hole. The provision of the injection hole can facilitate the injection molding of the rotor core 10, the permanent magnet 210 and the rotating shaft 220 into a whole. The gaps between the core units of the rotor core 10 and the gaps between the rotor core 10 and the rotating shaft 220 can be filled with the injection molding body 230.

[0081] See also Fig.11The embodiment of the second aspect of the present invention further provides a rotor assembly 200, which includes the rotor core 10 in any of the above embodiments, and the rotor assembly 200 also includes a plurality of permanent magnets 210 or a rotating shaft 220 or an injection molded body 230. A plurality of permanent magnets 210 can be arranged in the accommodating space 120, wherein different arrangements can refer to the above. The rotating shaft 220 can be arranged in the middle of the rotor core 10, and the axis of the rotating shaft 220 can coincide with the axis of rotation. The injection molded body 230 can be coated on the outside of the rotor core 10, and the injection molded body 230 fills the gap between the rotor core 10 and the rotating shaft 220. The injection molded body 230 can connect the rotating shaft 220 and the rotor core 10 respectively. Regarding the connection mode of the injection molding body 230, in some embodiments, when the rotor core 10 units are arranged disconnected from each other, the injection molding body 230 can be coated on the outside of the rotor core 10, and the injection molding body 230 can fill the gap between the rotor core 10 and the shaft 220, so that the injection molding body 230 can respectively connect the shaft 220 and the rotor core 10. In some embodiments, the shaft 220 may not be directly connected to each core unit 100, but is indirectly connected through the injection molding body 230.

[0082] In the specific processing of the above-mentioned rotor assembly 200, the relative position between the rotating shaft 220 and the rotor core 10 can be first positioned, and then the combination of the two can be injection molded to form an injection molded body 230, so that the injection molded body 230 wraps 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 purpose of fixing the rotating shaft 220 and the rotor core 10. Before the above-mentioned injection molding step, the permanent magnet 210 can also be installed in the accommodating space 120, so that the rotor assembly 200 can be formed in one piece, so that the permanent magnet 210 can be installed more stably.

[0083] An embodiment of the third aspect of the present invention provides a motor, which includes the rotor assembly 200 and the stator assembly in any of the above embodiments.

[0084] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A rotor core, characterized in that: The rotor core comprises a plurality of core units arranged around the rotation axis of the rotor core, wherein an accommodation space is defined between each two adjacent core units, and the accommodation space is used to accommodate a permanent magnet, and one of the core units is a first core unit, and along the circumferential direction of the rotation axis, the first core unit is disconnected from the other core units; The first core unit includes a plurality of laminations stacked in a direction parallel to the rotation axis, one of the laminations being a first lamination; The side of the first laminate facing the rotation axis has a first groove body that is recessed in a direction away from the rotation axis.

2. The rotor core according to claim 1, characterized in that: The first stack includes a first side and a second side that are arranged opposite to each other along the circumference of the rotation axis. The first slot is defined by a first wall, a second wall, and a third wall of the first stack close to the rotation axis. Along the circumference of the rotation axis, 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. Along the circumferential direction of the rotation axis, the first slot body 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 groove body includes a first groove portion and a second groove portion. Along the circumferential direction of the rotation axis, the first groove portion is defined by the first wall surface and an end of the third wall surface close to the first side edge, and the second groove portion is defined by the second wall surface and an end of the third wall surface close to the second side edge.

3. The rotor core according to claim 1, characterized in that: The first laminate includes a first side and a second side which are arranged opposite to each other along the circumference of the rotation axis. The first side has a first protrusion at one end close to the rotation axis. The first groove is arranged on the side of the first protrusion close to the rotation axis.

4. The rotor core according to claim 1, characterized in that: The side of the first laminate away from the rotation axis has a second groove body which is recessed toward the direction approaching the rotation axis.

5. The rotor core according to claim 1, characterized in that: The first stack is symmetrically arranged with respect to a first plane, the rotation axis is located in the first plane, and the first slot is symmetrically arranged with respect to the first plane.

6. The rotor core according to claim 1, characterized in that: The shapes and structures of the laminations of the first core unit are the same; or, The number of the laminations of the first core unit is an even number N, and the shapes of at least N / 2 of the laminations are the same as the shape of the first lamination; or, The number of the laminations of the first core unit is an odd number M, and at least (M-1) / 2 of the laminations have the same shape as that of the first lamination.

7. The rotor core according to claim 1, characterized in that: The rotor core has a second plane, which is perpendicular to the rotation axis. The laminations are symmetrically arranged about the second plane. Along a direction parallel to the rotation axis, there is at least one first lamination on both sides of the second plane.

8. The rotor core according to claim 1, characterized in that: The core units are disconnected from each other, and the shapes and structures of the core units are the same.

9. A rotor assembly, characterized in that: include: The rotor core according to any one of claims 1 to 8; The plurality of permanent magnets are arranged in the accommodation space.

10. A motor, characterized in that: include: The rotor assembly according to claim 9; as well as, Stator assembly.

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