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 M1 first laminations which are arranged in a laminated mode in the direction parallel to the rotating axis, each first lamination is provided with a first side edge and a second side edge which are oppositely arranged in the circumferential direction of the rotating axis, and the end, close to the rotating axis, of at least one first side edge is provided with a first protrusion. The first protrusion is used for abutting against the end, close to the rotating axis, of the permanent magnet. 1 < = N1 < M1. According to the rotor iron core, through various side edge structure designs, the magnetic leakage effect can be reduced, the motor power density and the rotor material utilization rate are improved, and installation and fixation of the permanent magnets are not affected.

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 an internal magnetic bridge, which is used to connect adjacent sector-shaped units in the rotor core to the inner annular portion to form a whole, which is convenient for assembly and manufacturing, and the inner annular portion of the sector-shaped unit can limit the permanent magnet. Under this design, due to the existence of the annular portion or other limiting structures of the rotor core, the extension of the limiting structure makes the distribution of magnetic energy uneven, so that leakage magnetic field is inevitably formed between adjacent magnetic poles, which reduces the power density of the motor, and the core can only be punched as a whole, and the material utilization rate is low. Removing the limiting structure is not conducive to the installation and fixation of the permanent magnet, and the manufacturability is poor. Therefore, if the prior art is to stably position the permanent magnet, a limiting structure must be designed, and the existence of the limiting structure will cause inevitable leakage magnetic field effect.

[0003] Therefore, how to reduce the leakage magnetic field effect of the permanent magnet motor and improve the utilization rate of the core material while taking into account the manufacturability and stably positioning the permanent magnet is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0004] The main purpose of the present invention is to provide a rotor core that can reduce the magnetic leakage effect, improve the power density of the motor and the utilization rate of the rotor material, and does not affect the installation and fixation of the permanent magnets.

[0005] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0006] 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;

[0007] The first core unit includes M1 first laminations stacked in a direction parallel to the rotation axis, each first lamination has a first side and a second side arranged opposite to each other in the circumferential direction of the rotation axis, no more than N1 first laminations and at least one first side has a first protrusion at an end close to the rotation axis, and the first protrusion is used to abut against an end of the permanent magnet close to the rotation axis;

[0008] Among them, 1≤N1<M1.

[0009] In some embodiments, no more than N2 and at least one of the first side edges has a second protrusion at the end away from the rotation axis, and the second protrusion is used to abut against an end of the permanent magnet away from the rotation axis;

[0010] Among them, 1≤N2<M1.

[0011] In some embodiments, at least one first side has a first protrusion at an end close to the rotation axis, and has a second protrusion at an end away from the rotation axis, and the second protrusion is used to abut against an end of the permanent magnet away from the rotation axis.

[0012] In some embodiments, no more than N3 and at least one of the second sides has a third protrusion at an end close to the rotation axis, and the third protrusion is used to abut against an end of the permanent magnet close to the rotation axis;

[0013] Among them, 1≤N3<M1.

[0014] In some embodiments, one of the core units is a second core unit, and along the circumferential direction of the rotation axis, the second core unit is disconnected from the other core units, the first core unit and the second core unit are arranged adjacently and spaced apart, and the second core unit includes M2 second laminations stacked in a direction parallel to the rotation axis, and each second lamination has a third side facing the first side;

[0015] No more than N4 and at least one of the third sides has a fourth protrusion at an end close to the rotation axis, and the fourth protrusion is used to abut against an end of the permanent magnet close to the rotation axis;

[0016] Among them, 1≤N4<M2.

[0017] In some embodiments, one of the core units is a second core unit, and along the circumferential direction of the rotation axis, the second core unit is disconnected from the other core units, the first core unit and the second core unit are arranged adjacently and spaced apart, the second core unit includes a plurality of second laminations stacked in a direction parallel to the rotation axis, and each second lamination has a third side facing the first side;

[0018] Along the circumferential direction of the rotation axis, a minimum dimension L1 of the first protrusion from the third side and a maximum dimension L2 of the first side from the third side satisfy: 0.3≤L1 / L2<0.95.

[0019] In some embodiments, at least one of the first side edges has a second protrusion at an end away from the rotation axis, and the second protrusion is used to abut against an end of the permanent magnet away from the rotation axis;

[0020] One of the core units is a second core unit, the second core unit is disconnected from the other core units along the circumferential direction of the rotation axis, the first core unit and the second core unit are arranged adjacently and spaced apart, the second core unit comprises a plurality of second laminations stacked in a direction parallel to the rotation axis, each second lamination having a third side facing the first side;

[0021] Along the circumferential direction of the rotation axis, a minimum dimension L3 of the second protrusion from the third side and a maximum dimension L4 of the first side from the third side satisfy: 0.5≤L3 / L4<0.95.

[0022] In some embodiments, the total number of first laminations in the first core unit is M3, wherein the ends of the first sides of N3 first laminations close to the rotation axis have first protrusions, and M3>2N3.

[0023] In some embodiments, along a direction parallel to the rotation axis, in every two adjacent first laminates, at most one end of the first side close to the rotation axis has a first protrusion.

[0024] In some embodiments, the rotor core has a first plane, the first plane is perpendicular to the rotation axis, and each first lamination is symmetrically arranged about the first plane. Along the direction parallel to the rotation axis, at least one first side edge on both sides of the first plane has a first protrusion at the end close to the rotation axis.

[0025] In some embodiments, the core units are disconnected from each other, and the shapes and structures of the core units are the same.

[0026] The embodiment of the second aspect of the present invention further provides a rotor assembly, comprising:

[0027] A rotor core according to any of the above;

[0028] A plurality of permanent magnets are arranged in the accommodating space.

[0029] The third aspect of the present invention further provides a motor, comprising:

[0030] A rotor assembly as claimed in any one of the preceding claims; and

[0031] Stator assembly.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The rotor core of the present invention includes a plurality of core units, including a first core unit, the first core unit having a plurality of laminations, and the first core unit including M1 first laminations stacked in a direction parallel to the rotation axis. Each first lamination has a first side and a second side arranged relative to each other in the circumferential direction of the rotation axis, no more than N1, and at least one first side has a first protrusion at the end close to the rotation axis, the first protrusion is used to abut against one end of the permanent magnet close to the rotation axis, and 1≤N1<M1. The extended limiting structure has a limiting function and will cause a certain magnetic leakage effect. Therefore, compared with the limiting structure design in the prior art, the present invention limits the end of at least one first lamination close to the rotation axis to have a first protrusion, and the number of such first laminations is less than the total number of first laminations, so that the rotor core of the present invention can reduce the magnetic leakage effect through a variety of side structure designs, and improve the power density of the motor and the utilization rate of the rotor material, and does not affect the installation and fixation of the permanent magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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.

[0035] Figure 1 It is a side view schematic diagram of a rotor core in the prior art;

[0036] Figure 2 A schematic side view of a rotor core provided in a first embodiment of the present invention;

[0037] Figure 3 It is a three-dimensional schematic diagram of a first core unit provided in a second embodiment of the present invention;

[0038] Figure 4 A schematic side view of a first laminate provided in a third embodiment of the present invention;

[0039] Figure 5 A side view schematic diagram of a first laminate provided in a fourth embodiment of the present invention;

[0040] Figure 6 is a side view schematic diagram of relatively arranged laminations in a first embodiment of the present invention;

[0041] Figure 7 is a side view schematic diagram of relatively arranged laminations in a fifth embodiment of the present invention;

[0042] Figure 8is a side view schematic diagram of relatively arranged laminations in a sixth embodiment of the present invention;

[0043] Fig. 9 is a side view schematic diagram of relatively arranged laminations in a seventh embodiment of the present invention;

[0044] Fig.10 is a side view schematic diagram of relatively arranged laminations in an eighth embodiment of the present invention;

[0045] Fig.11 is a side view schematic diagram of relatively arranged laminations in a ninth embodiment of the present invention;

[0046] Fig.12 is a side view schematic diagram of relatively arranged laminations in a tenth embodiment of the present invention;

[0047] Fig.13 A schematic side view of a rotor core provided in an eleventh embodiment of the present invention;

[0048] Fig.14 is a three-dimensional schematic diagram of a first core unit provided in a twelfth embodiment of the present invention;

[0049] Fig.15 It is a three-dimensional schematic diagram of a first core unit provided in a thirteenth embodiment of the present invention;

[0050] Fig.16 A schematic side view of a rotor assembly is provided for an embodiment of another aspect of the present invention.

[0051] Description of Figure Numbers:

[0052] 50- rotor core; 51- inner magnetic bridge; 52- sector unit; 53- annular portion;

[0053] 10- rotor core;

[0054] 100-core unit; 100a-first core unit; 100b-second core unit;

[0055] 110a-first laminate; 110b-second laminate;

[0056] 111a-first side; 1111a-first protrusion; 1112a-second protrusion; 112a-second side; 1121a-third protrusion;

[0057] 111b-third side; 1111b-fourth protrusion;

[0058] 120-accommodation space;

[0059] P-first plane;

[0060] 200 - rotor assembly; 210 - permanent magnet; 220 - shaft; 230 - coating layer.

[0061] 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

[0062] 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.

[0063] 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.

[0064] 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, or scheme B, or a scheme that satisfies both A and B. 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 the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0065] See also Figure 1, an existing rotor core 50 is provided with an inner magnetic bridge 51, which is used to connect adjacent sector-shaped units 52 in the rotor core 50 to the inner annular portion 53, or to set a circumferentially extending limiting body inside the sector-shaped unit 52. The annular portion 53 or limiting body inside the above-mentioned sector-shaped unit can limit the permanent magnet, and has a wall surface that extends circumferentially and abuts against the permanent magnet. Under this design, due to the existence of the annular portion 53 or other limiting structures of the rotor core, the extension of the limiting structure makes the distribution of magnetic energy uneven, thereby inevitably forming a leakage magnetic phenomenon between adjacent magnetic poles, reducing the power density of the motor, and the core can only be punched as a whole, and the material utilization rate is low. Removing the limiting structure is not conducive to the installation and fixation of the permanent magnet, and the manufacturability is poor. Therefore, if the prior art is to stably position the permanent magnet, a limiting structure must be designed, and the existence of the limiting structure will cause an inevitable leakage magnetic effect. Therefore, in the prior art, if the permanent magnet is to be stably positioned, a limiting structure must be designed, and the existence of the limiting structure will cause an inevitable magnetic leakage effect.

[0066] In view of this, see Figure 2-Figure 15 An embodiment of the present invention provides a rotor core 10 that can reduce the magnetic leakage effect, improve the motor power density and the rotor material utilization rate, and does not affect the manufacturability of the installation and fixation of the permanent magnet 210.

[0067] The rotor core 10 includes a plurality of core units 100 arranged around the rotation axis of the rotor core 10. An accommodation space 120 is defined between two adjacent core units 100. The accommodation space 120 is used to accommodate the permanent magnet 210. One of the core units 100 is a first core unit 100a. The first core unit 100a 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 100 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 100 can be fan-shaped, and the core units 100 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 100. An accommodation space 120 is defined between two adjacent core units 100, 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 100 that can accommodate the permanent magnet 210.

[0068] See also Figure 2In this embodiment, ten core units 100 can jointly define ten accommodating spaces 120, so that the rotor assembly 200 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 100, 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 100 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 200 may correspond to the maximum radial dimension of the accommodation space 120 along the rotor assembly 200. According to the above configuration, the accommodation space 120 may be defined by two circumferentially opposite walls between two adjacent core units 100.

[0069] The core units 100 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 100 is disconnected from each other. In other embodiments, some of the core units 100 may be connected to each other.

[0070] It should be noted that, in some embodiments, the rotor core 10 is not assembled into the rotor assembly 200 and is in a state before injection molding. Therefore, the state in which the first core unit 100a is disconnected from the other core units can be understood as the first core unit 100a is separated 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.

[0071] See also Figure 2-Figure 3 The first core unit 100a includes M1 first laminations 110a stacked in a direction parallel to the rotation axis, each first lamination 110a has a first side 111a and a second side 112a arranged opposite to each other in the circumferential direction of the rotation axis, no more than N1 and at least one first side 111a has a first protrusion 1111a at the end close to the rotation axis, and the first protrusion 1111a is used to abut one end of the permanent magnet 210 close to the rotation axis; wherein 1≤N1<M1.

[0072] In some embodiments, M1 may be the total number of laminations included in the first core unit 100a; in other embodiments, M1 may be the number of some laminations in the first core unit 100a, that is, in this embodiment, the first core unit 100a may include laminations greater than M1, and the remaining laminations may be first laminations 110a or other laminations. For ease of description, the following is an example in which M1 is the total number of laminations included in the first core unit 100a, and different embodiments may be combined with each other in different technical solutions.

[0073] Accordingly, it can be understood that N1 can be expressed as the maximum number of first laminations 110a having the first protrusion 1111a at the end of the first side 111a close to the rotation axis that can be present. Therefore, in some embodiments, the number of first laminations 110a having the first protrusion 1111a at the end of the first side 111a close to the rotation axis can be N1. In other embodiments, the number of first laminations 110a having the first protrusion 1111a at the end of the first side 111a close to the rotation axis can be less than N1 (the actual number is less than the maximum number N1). For ease of description, the following embodiment in which the number of first laminations 110a having the first protrusion 1111a at the end of the first side 111a close to the rotation axis is N1 is used as an example for illustration, and different embodiments can be combined with each other between different technical solutions.

[0074] See also Figure 3-Figure 5 , each first lamination 110a has a first side 111a and a second side 112a which are arranged opposite to each other along the circumferential direction of the rotation axis. It should be noted that the first side 111a and the second side 112a of each first lamination 110a are limitations on the structure of the first lamination 110a, so the first side 111a of each first lamination 110a is located on the same side of the corresponding first lamination 110a and on the same side of the permanent magnet 210; correspondingly, the second side 112a of each first lamination 110a is located on the same side of the corresponding first lamination 110a and on the same side of the permanent magnet 210.

[0075] No more than N1 and at least one first side 111a has a first protrusion 1111a at one end close to the rotation axis. Wherein, 1≤N1<M1. It can be understood that each first lamination 110a includes at least two types, wherein one first lamination 110a has a first protrusion 1111a at the end close to the rotation axis; another first lamination 110a does not have a first protrusion 1111a at the end close to the rotation axis; and the corresponding number of laminations having a first protrusion 1111a structure is greater than or equal to 1, and is less than the total number of first laminations 110a included in the first core unit 100a. It should be noted that the above-mentioned N1 is the maximum number of first side 111a having a first protrusion 1111a. In different embodiments, the first side 111a of a single first laminate 110a may have only one first protrusion 1111a or may have multiple first protrusions 1111a. For ease of description, the following is an embodiment in which the first side 111a of a single laminate has only one first protrusion 1111a as an example. Different embodiments may be combined with different technical solutions. For example, in some embodiments, under the premise that M1 is 5, the number N1 of the first side 111a with the first protrusion 1111a in the first core unit 100a may be one of 1, 2, 3, and 4; in other embodiments, under the premise that M1 is 3, the number N1 of the first side 111a with the first protrusion 1111a in the first core unit may be one of 1 and 2. The above-mentioned setting of the first protrusion 1111a can make the first core unit 100a include two types of first laminations 110a simultaneously along the direction parallel to the rotation axis, namely, a first lamination 110a having the first protrusion 1111a at the end of the first side 111a close to the rotation axis and a first lamination 110a not having the first protrusion 1111a at the end of the first side 111a close to the rotation axis.

[0076] Regarding the abutment effect of the first protrusion 1111a. It is understandable that the first side 111a has an end close to the rotation axis and the other end away from the rotation axis, and the two ends can be located on the wall surface of the same side or on different wall surfaces respectively. The first protrusion 1111a is used to abut one end of the permanent magnet 210 away from the rotation axis. It is understandable that the first protrusion 1111a is used to abut one end of the permanent magnet 210 away from the rotation axis. It is understandable that the first protrusion 1111a is used to limit the displacement of the permanent magnet 210 in the direction close to the rotation axis, thereby limiting the displacement of the permanent magnet 210 and facilitating the installation and connection of the permanent magnet 210 to the rotor core 10. Regarding the structure of the first protrusion 1111a. The first protrusion 1111a can extend along the first circumferential direction. The first protrusion 1111a can have an abutment end face facing the permanent magnet 210 and used to abut the permanent magnet 210, and the abutment end face can be a plane or a curved surface. It should be noted that the way in which the first protrusion 1111a abuts against the permanent magnet 210 can be direct abutment or indirect abutment. Specifically, in some embodiments, the first protrusion 1111a can be used to contact and abut against the permanent magnet 210; in other embodiments, there is a filler between the first protrusion 1111a and the permanent magnet 210, the first protrusion 1111a can abut against the filler, and the filler can further abut against the permanent magnet 210. For ease of description, the following is an embodiment in which the first protrusion 1111a directly abuts against the permanent magnet 210, and different embodiments can be combined with each other between different technical solutions.

[0077] See also Figure 3-Figure 5 , corresponding to the arrangement of the first protrusion 1111a. The first side edge 111a and the second side edge 112a may be located on both sides of the first laminate 110a along the circumferential direction. In some embodiments, the first side edge 111a and the second side edge 112a may be used to define adjacent different accommodation spaces 120. Figure 4 In some embodiments, the first side edge 111a (or the second side edge 112a) may be a side edge on the wall surface on the same side of the first laminate 110a. It can be understood that in this embodiment, the first protrusion 1111a is located on the wall surface on the same side of the first laminate 110a; see Figure 5 In other embodiments, the first side 111a or the second side 112a may be a side on a multi-section wall of the first laminate 110a. It can be understood that in this embodiment, the first protrusion 1111a is located on the side formed by the multi-section wall of the first laminate 110a.

[0078] 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 100, including a first core unit 100a, and the first core unit 100a has a plurality of first laminations 110a arranged in layers. Each first lamination 110a includes at least two types, wherein the end of the first side 111a of one first lamination 110a close to the rotation axis has a first protrusion 1111a, and the end of the first side 111a of another first lamination 110a close to the rotation axis does not have the first protrusion 1111a; the number of laminations having the first protrusion 1111a structure is greater than or equal to 1, and is less than the total number of first laminations 110a included in the first core unit 100a. The first protrusion 1111a can abut against the end of the permanent magnet 210 away from the rotation axis. It can be understood that the above-mentioned setting can make the rotor core 10 have at least one first core unit 100a, and the first core unit 100a includes at least one first lamination 110a with a first protrusion structure and one first lamination 110a without a first protrusion structure. Because the extended limiting structure has a limiting function and affects the conduction of magnetic energy of the rotor core 10. The extended limiting structure has a limiting function and causes a certain magnetic leakage effect. Therefore, compared with the limiting structure design of the rotor core 10 in the prior art, the present invention defines that at least one first lamination 110a has a first protrusion 1111a at the end close to the rotation axis, and the number of such first laminations 110a is less than the total number of first laminations 110a, so that the rotor core 10 of the present invention can reduce the magnetic leakage effect through a variety of side structure designs, and improve the power density of the motor and the utilization rate of the rotor material, and does not affect the installation and fixation of the permanent magnet.

[0079] It is understood that in the above-mentioned embodiment, the first protrusion 1111a can be used to limit the displacement of the permanent magnet 210 in the direction close to the rotation axis. In some embodiments, it is also necessary to limit the displacement of the permanent magnet 210 in other directions to improve manufacturability. Figure 3-Figure 4In some embodiments, no more than N2 and at least one of the first side edges 111a has a second protrusion 1112a at the end away from the rotation axis. Wherein, 1≤N2<M1. Similar to the setting of the first protrusion 1111a, the above-mentioned N2 is the maximum number of the first side edges 111a having the second protrusion 1112a. The second protrusion 1112a is used to abut against the end of the permanent magnet 210 away from the rotation axis. It can be understood that the second protrusion 1112a can be used to limit the displacement of the permanent magnet 210 in the direction away from the rotation axis. It can be understood that, similar to the setting of the first protrusion 1111a, the second protrusion 1112a can be set at the end of the first side edge 111a away from the rotation axis. And in the above-mentioned embodiment, the setting method of the second protrusion 1112a can correspond to the setting of the first protrusion 1111a, the difference is that the second protrusion 1112a and the first protrusion 1111a are set at different positions and the limiting directions are opposite. For the configuration and structure of the second protrusion 1112a in different embodiments, reference may be made to the description of the first protrusion 1111a, which will not be repeated here.

[0080] See also Figure 6-Figure 9 For the above-mentioned embodiment including the second protrusion 1112a, the accommodation space 120 can be defined by two circumferentially opposite wall surfaces between two adjacent core units 100 and the first protrusion 1111a and the second protrusion 1112a that are opposite in the radial direction. In order to make the arrangement of the protrusions convenient for the installation of the permanent magnet 210 and have a good limiting function. In some embodiments, along the radial direction perpendicular to the rotation axis, the minimum distance between the first protrusion 1111a and the second protrusion 1112a can correspond to the length of the permanent magnet 210 along the radial direction perpendicular to the rotation axis, so that the permanent magnet 210 can be easily placed in the accommodation space 120.

[0081] In order to enhance the limiting effect of the first protrusion 1111a on the permanent magnet 210, in some embodiments, two opposing core units 100 may be provided to define the accommodation space 120, and the structures of the two core units 100 can limit the displacement of the permanent magnet 210 in the direction close to the rotation axis. Figure 6 In the embodiment of the first aspect, no more than N3 and at least one of the second side edges 112a close to the rotation axis may be provided with a third protrusion 1121a. Wherein, 1≤N3<M1. Similar to the arrangement of the first protrusion 1111a, the above-mentioned N3 is the maximum number of second side edges 112a having the third protrusion 1121a. The third protrusion 1121a can be used to abut against one end of the permanent magnet 210 close to the rotation axis, and it can be understood that the third protrusion 1121a can be used to limit the displacement of the permanent magnet 210 in the direction close to the rotation axis.

[0082] In order to facilitate the first protrusion 1111a and the third protrusion 1121a to jointly form a limiting effect, for the above-mentioned embodiment in which the first protrusion 1111a extends along the first circumferential direction, in some embodiments, the third protrusion 1121a can extend in the opposite direction of the first circumferential direction. In this embodiment, two adjacent first core units 100a can be provided to define a receiving space 120, and the receiving space 120 is defined by the first side 111a and the second side 112a arranged oppositely along the circumferential direction of the rotation axis. It can be understood that in this embodiment, two protrusions are provided on two opposite sides of the first lamination 110a, and through the two first core units 100a (first laminations 110a) arranged along the circumferential direction, the two protrusion structures can jointly limit the permanent magnet 210 in the receiving space 120. For the configuration and structure of the third protrusion 1121a in different embodiments, reference can be made to the description of the first protrusion 1111a, which will not be repeated here.

[0083] See also Figure 7 In the embodiment of the second aspect, one of the core units 100 may be a second core unit 100b. The second core unit 100b is disconnected from the other core units. Along the circumference of the rotation axis, the first core unit 100a and the second core unit 100b may be arranged adjacently and spaced apart. The second core unit may include M2 ​​second laminations 110b stacked in a direction parallel to the rotation axis, each second lamination 110b having a third side 111b and a fourth side arranged oppositely along the circumference of the rotation axis (or it can be understood that each second lamination 110b has a third side 111b facing the first side 111a), no more than N4 and at least one third side 111b has a fourth protrusion 1111b at the end close to the rotation axis. Wherein, 1≤N4<M2. Similar to the setting of the first protrusion 1111a, the above-mentioned N4 is the maximum number of third sides 111b having the fourth protrusion 1111b.

[0084] It can be understood that in this embodiment, along the circumferential direction of the rotation axis, the second core unit 100b can be arranged adjacent to the first core unit 100a and spaced to define an accommodation space 120, and the first side 111a and the third side 111b in the accommodation space 120 are arranged opposite to each other. It should be noted that in some embodiments, the first lamination 110a can be included in the plurality of laminations of the second core unit 100b.

[0085] Along the circumference of the rotation axis, the fourth protrusion 1111b and the first protrusion 1111a are arranged opposite to each other. The fourth protrusion 1111b can be used to abut against the end of the permanent magnet 210 away from the rotation axis, which can be understood as the fourth protrusion 1111b is used to limit the displacement of the permanent magnet 210 in the direction close to the rotation axis. It can be understood that in this embodiment, similar to the above-mentioned second protrusion 1112a, the second core unit 100b can be provided with a fourth protrusion 1111b on the third side 111b of one end close to the rotation axis. It can be understood that the embodiment of the first aspect above adopts two first core units 100a arranged relatively along the circumferential direction of the rotation axis to define the accommodation space 120, and the first protrusion 1111a and the third protrusion 1121a relative to each other are provided between the accommodation space 120, while in this embodiment, the first core unit 100a and the second core unit 100b arranged relatively along the circumferential direction of the rotation axis can be used to jointly define the accommodation space 120, and the first protrusion 1111a and the fourth protrusion 1111b relative to each other are provided between the accommodation space 120. For the configuration and structure of the fourth protrusion 1111b in different embodiments, reference can be made to the description of the first protrusion 1111a, which will not be repeated here.

[0086] It can be understood that the above-mentioned embodiments of the first aspect and the embodiments of the second aspect respectively correspond to different settings of the limiting structure opposite to the first protrusion 1111a along the circumferential direction of the rotation axis, and the third protrusion 1121a / the fourth protrusion 1111b is used to cooperate with the first protrusion 1111a to jointly limit the displacement of the permanent magnet 210 in the direction close to the rotation axis.

[0087] Referring to the above two embodiments, corresponding to the second protrusion 1112a, different protrusion structures can also be set, and together with the second protrusion 1112a, they can limit the displacement of the permanent magnet 210 in the direction away from the rotation axis. Figure 6 In the embodiment of the third aspect, no more than N3 and at least one of the second side edges 112a away from the rotation axis may be provided with a fifth protrusion. Wherein, 1≤N5<M1. Similar to the arrangement of the third protrusion 1121a, the above-mentioned N5 is the maximum number of second side edges 112a having the fifth protrusion. The fifth protrusion can be used to abut against one end of the permanent magnet 210 away from the rotation axis, which can be understood as the fifth protrusion can be used to limit the displacement of the permanent magnet 210 in the direction away from the rotation axis.

[0088] See also Figure 7In the embodiment of the fourth aspect, one of the core units 100 may be a third core unit. The third core unit is disconnected from the other core units. Along the circumference of the rotation axis, the first core unit 100a and the third core unit may be arranged adjacently and spaced apart. The third core unit includes M3 laminations stacked in a direction parallel to the rotation axis, each lamination having a third side 111b and a fourth side arranged oppositely along the circumference of the rotation axis, and no more than N6 and at least one third side having a sixth protrusion at the end away from the rotation axis. Wherein, 1≤N6<M3. Similar to the setting of the fourth protrusion 1111b, the above-mentioned N6 is the maximum number of third sides having the sixth protrusion. The sixth protrusion can be used to abut against one end of the permanent magnet 210 away from the rotation axis, and it can be understood that the sixth protrusion can be used to limit the displacement of the permanent magnet 210 in the direction away from the rotation axis.

[0089] For the above-mentioned protrusion structures located at the same end and arranged oppositely in the accommodating space 120, in some embodiments, the relatively arranged protrusion structures are connected to each other; in other embodiments, in order to reduce the leakage magnetic effect there, the above-mentioned relatively arranged protrusion structures (such as the first protrusion 1111a and the third protrusion 1121a) may not be connected to each other.

[0090] In order to make the fixed limiting effect of the rotor core 10 on the permanent magnet 210 more reliable, in some embodiments, in the laminations of two adjacent core units 100, at least one protrusion is provided at one end close to the rotation axis, and at least one protrusion is provided at one end away from the rotation axis. The above arrangement can make the end close to the rotation axis and the end away from the rotation axis between the two adjacent core units 100 have limiting structures, and can limit the two ends of the permanent magnet 210.

[0091] For the embodiment in which the end of the first side edge 111a away from the rotation axis has a second protrusion 1112a, see Figure 2-Figure 4In some embodiments, at least one first side 111a has a first protrusion 1111a at the end close to the rotation axis, and has a second protrusion 1112a at the end away from the rotation axis, and the second protrusion 1112a can be used to abut against the end of the permanent magnet away from the rotation axis. It can be understood that in this embodiment, at least one first laminate 110a has a first protrusion 1111a and a second protrusion 1112a at the end close to the rotation axis and the end away from the rotation axis, respectively. Further, in some embodiments, it can also be defined that in every two adjacent core units 100, at least one first side 111a has a first protrusion 1111a at the end close to the rotation axis, and has a second protrusion 1112a at the end away from the rotation axis. It can be understood that a plurality of permanent magnets 210 placed in the accommodating space 120 can each correspond to at least one first laminate 110a having both a first protrusion 1111a and a second protrusion 1112a. The above arrangement can reduce the number of asymmetric lamination structures located at both ends of the permanent magnet 210, thereby increasing the versatility of the laminations, reducing the number of lamination molds, and reducing the manufacturing cost of the laminations.

[0092] See also Figure 8 In other embodiments, along the circumference of the rotation axis, at least one protrusion (which may be the first protrusion 1111a or the third protrusion 1121a or the fourth protrusion 1111b) is provided at one end of the core unit 100 on one side close to the rotation axis, and at least one protrusion (which may be the second protrusion 1112a) is provided at one end of the core unit 100 on the other side away from the rotation axis. It can be understood that in this embodiment, two adjacent core units 100 have at least one protrusion on both sides in the opposite direction, and the two protrusion structures can form a diagonal limiting structure on both sides, so that the permanent magnet 210 can be limited more stably.

[0093] In some embodiments, the extension length of the protrusion structure can be limited to ensure that the protrusion structure can stably abut against the permanent magnet 210 and play a limiting role, and the leakage magnetic field at this location is small.

[0094] Specifically, for the structure at the inner periphery of the core unit 100. In some embodiments, one of the core units may be a second core unit 100b. The second core unit 100b is disconnected from the other core units, and the first core unit 100a and the second core unit 100b are arranged adjacently and spaced along the circumference of the rotation axis. The second core unit may include a plurality of laminations 110, and one of the laminations 110 is a second lamination 110b. Each second lamination 110b has a third side 111b facing the first side 111a. Along the circumference of the rotation axis, the first side 111a faces the third side 111b. It can be understood that the arrangement of the second core unit 100b in this embodiment is similar to that in the previous embodiment, except that the second core unit in this embodiment is used to define the structure at the inner periphery of the core unit 100. Corresponding to the structure at the inner periphery of the core unit 100, the third side 111b and the fourth side of this embodiment may be located at the end of the second lamination 110b close to the rotation axis. Figure 10-11 In this embodiment, along the circumference of the rotation axis, the minimum dimension L1 of the first protrusion 1111a from the third side 111b and the maximum dimension L2 of the first side 111a from the third side 111b can satisfy: 0.3≤L1 / L2<0.95. For example, L1 / L2 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc. Figure 10-11 In some embodiments, L2 may correspond to the maximum arc length of the first side 111a and the third side 111b along the circumferential direction; correspondingly, L1 may correspond to the minimum arc length of the first protrusion 1111a and the third side 111b along the circumferential direction. In this embodiment, the above range can ensure the limiting effect at the inner periphery of the core unit 100 while reducing the leakage magnetic influence.

[0095] Correspondingly, for the structure at the periphery of the core unit 100. In some embodiments, one of the core units may be the second core unit 100b. The second core unit 100b is disconnected from the other core units, and the first core unit 100a and the second core unit 100b are arranged adjacently and spaced along the circumference of the rotation axis. The second core unit may include a plurality of laminations 110, and one of the laminations 110 is the second lamination 110b. Each second lamination 110b has a third side 111b facing the first side 111a. Along the circumference of the rotation axis, the first side 111a faces the third side 111b. It can be understood that the arrangement of the second core unit 100b in this embodiment is similar to that in the previous embodiment, except that the second core unit in this embodiment is used to define the structure at the periphery of the core unit 100. Corresponding to the structure at the periphery of the core unit 100, the third side 111b and the fourth side of this embodiment may be located at the end of the second lamination 110b away from the rotation axis. See also Figure 10-11In this embodiment, along the circumference of the rotation axis, the minimum dimension L3 of the second protrusion 1112a from the third side 111b and the maximum dimension L4 of the first side 111a from the third side 111b can satisfy: 0.5≤L3 / L4<0.95. Exemplarily, L3 / L4 can be 0.5, 0.6, 0.7, 0.8, 0.9, etc. In some embodiments, L4 can correspond to the maximum arc length of the third side 111b and the first side 111a along the circumference; correspondingly, L3 can correspond to the minimum arc length of the second protrusion 1112a and the third side 111b along the circumference. In this embodiment, the above range can ensure the limiting effect at the periphery of the core unit 100 while reducing the leakage magnetic influence.

[0096] The first laminate 110a does not have the first protrusion 1111a at the end of the first side 111a close to the rotation axis. Fig.12 In some embodiments, the end of the first stack 110a away from the rotation axis may have a protruding structure; in other embodiments, the ends of the first stack 110a close to and away from the rotation axis do not have a protruding structure.

[0097] In order to make the limiting effect of the first protrusion 1111a on the permanent magnet 210 more stable, the protrusion structure can be respectively arranged at both ends of the permanent magnet 210. Figure 3 In some embodiments, the rotor core may have a first plane P, and the first plane P is perpendicular to the rotation axis. Each first lamination 110a may be arranged symmetrically about the first plane P. Along the direction parallel to the rotation axis, at least one first side 111a on both sides of the first plane P has a first protrusion 1111a near the end of the rotation axis. It can be understood that along the direction parallel to the rotation axis, multiple first laminations 110a can be symmetrically distributed relative to the first plane P (when the total number of first laminations 110a is an odd number, the first plane P can pass through the first lamination 110a located in the middle). It can be understood that along the direction parallel to the rotation axis, multiple first laminations 110a can be distributed on both sides of the first plane P (can be evenly distributed or unevenly distributed), and at least one first side 111a on both sides has a first protrusion 1111a near the end of the rotation axis. The above arrangement can enable the first protrusion 1111a to be correspondingly located on both sides of the permanent magnet 210 along the direction parallel to the rotation axis, so that the limiting effect of the first protrusion 1111a is more stable. It should be noted that the definition of the first protrusion 1111a in the above embodiment can also be combined with the definition of the second protrusion 1112a, which will not be repeated here.

[0098] For the above-mentioned specific embodiment in which the first protrusions 1111a are arranged on both sides of the first plane P. In some embodiments, along the direction parallel to the rotation axis, the number of first protrusions 1111a on one side of the first plane P may be the same as or different from that on the other side. In some embodiments, the first laminations 110a having the first protrusions 1111a at the end of the first side 111a close to the rotation axis may be respectively located at the two ends of the first core unit 100a along the direction parallel to the rotation axis (one end may have one or more first protrusions 1111a), and the ends of the multiple first laminations 110a between the two ends close to the rotation axis do not have the first protrusions 1111a.

[0099] Further, for embodiments in which the core unit 100 includes second laminations 110b, in some embodiments, each second lamination 110b is symmetrically arranged about the first plane P, and along a direction parallel to the rotation axis, at least one third side edge 111b on both sides of the first plane P has a fourth protrusion 1111b at the end close to the rotation axis.

[0100] In order to further reduce the magnetic leakage effect of the rotor core 10, in some embodiments, the total number of first laminations 110a in the first core unit 100 is M3, wherein the end of the first side 111a of N3 first laminations 110a close to the rotation axis has a first protrusion, and M3>2N3. It can be understood that in this embodiment, the total number of first laminations 110a (M3) of the first core unit 100a in the direction parallel to the rotation axis is greater than twice the number of first laminations 110a with first protrusions 1111a (2N3). That is, among the above-mentioned M3 first laminations 110a, the number of first laminations 110a without first protrusions 1111a at the end of the first side 111a close to the rotation axis is greater than the number of first laminations 110a with first protrusions 1111a. Due to the above-mentioned quantitative relationship, this embodiment also defines that M1 is greater than or equal to 3. It is understandable that the above arrangement can make it possible for most of the first laminations 110a in the direction parallel to the rotation axis to not have the first protrusion 1111a, and for a few (at least one) of the first laminations 110a to have the first protrusion 1111a, thereby ensuring the limiting effect and reducing the magnetic leakage effect of the first protrusion 1111a on the first core unit 100a as a whole. It should be noted that the definition of the first protrusion 1111a in the above embodiment can also be combined with the definition of the second protrusion 1112a, which will not be repeated here.

[0101] The first laminate 110a with the first protrusion 1111a and the first laminate 110a without the first protrusion 1111a may have different arrangements. To reduce the magnetic flux leakage effect caused by the adjacent first protrusions 1111a, see Figure 14-15In some embodiments, along the direction parallel to the rotation axis, in each of two adjacent first laminations 110a, at most one first side edge 111a close to the rotation axis has a first protrusion 1111a. It can be understood that in this embodiment, the types of two adjacent first laminations 110a can include two situations, one situation is that one of the first laminations 110a has a first protrusion 1111a, and the other first lamination 110a does not have a first protrusion 1111a; the other situation is that both first laminations 110a do not have a first protrusion 1111a. The above-mentioned setting can make a certain gap between the multiple first protrusions 1111a along the direction parallel to the rotation axis (or there is only one first protrusion 1111a), so as to avoid the two adjacent first protrusions 1111a causing a greater magnetic leakage effect. It should be noted that the definition of the first protrusion 1111a in the above-mentioned embodiment can also be combined with the definition of the second protrusion 1112a, which will not be repeated here.

[0102] For the arrangement of multiple core units. In some embodiments, each core unit 100 can be disconnected from each other. It is understandable that the above-mentioned arrangement can make the multiple core units 100 have no connection structure with each other, thereby reducing the leakage magnetic effect. In some embodiments, the shape and structure of each core unit 100 can be the same (or similar). It is understandable that the above-mentioned arrangement can make the first core unit 100a and multiple core units with the same (or similar) shape and structure as the first core unit 100a be arranged around the rotation axis of the rotor core 10, and the first core unit 100a 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.

[0103] According to the use requirements of the rotor core 10, in some embodiments, multiple laminations of the core unit 100 can be used in combination with each other. For example, the first core unit 100a can also include a second lamination 110b; similarly, the second core unit 100b or other core units 100 can include the first lamination 110a. In addition, see Fig.13 , viewed in a direction parallel to the rotation axis, a plurality of core units 100 along the circumference of the rotation axis can be used in combination with each other. For example, the rotor core 10 may include the first core unit 100a in the above different embodiments or the second core unit 100b in the above different embodiments.

[0104] See also Figure 4, in order to facilitate the subsequent processing and manufacturing of the rotor assembly 200. 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 200. 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 100 of the rotor core 10, and the gaps between the rotor core 10 and the rotating shaft 220 can be filled with an injection molded body.

[0105] See also Fig.16 The 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 a coating 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 coating 230 can be coated on the outside of the rotor core 10, and the coating 230 fills the gap between the rotor core 10 and the rotating shaft 220. The coating 230 can connect the rotating shaft 220 and the rotor core 10 respectively. Regarding the connection mode of the coating layer 230, in some embodiments, when the rotor core 10 units are arranged disconnected from each other, the coating layer 230 can be coated on the outside of the rotor core 10, and the coating layer 230 can fill the gap between the rotor core 10 and the shaft 220, so that the coating layer 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 coating layer 230.

[0106] In the specific processing of the 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 the coating layer 230, so that the coating layer 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.

[0107] 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.

[0108] 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 comprises M1 first laminations stacked in a direction parallel to the rotation axis, each of the first laminations has a first side and a second side arranged opposite to each other in the circumferential direction of the rotation axis, no more than N1 and at least one of the first side ends close to the rotation axis has a first protrusion, and the first protrusion is used to abut against one end of the permanent magnet close to the rotation axis; Among them, 1≤N1<M1.

2. The rotor core according to claim 1, characterized in that: No more than N2 and at least one of the first side edges has a second protrusion at an end away from the rotation axis, and the second protrusion is used to abut against an end of the permanent magnet away from the rotation axis; Among them, 1≤N2<M1.

3. The rotor core according to claim 1, characterized in that: At least one of the first side edges has the first protrusion at an end portion close to the rotation axis, and has a second protrusion at an end portion away from the rotation axis, wherein the second protrusion is used to abut against an end of the permanent magnet away from the rotation axis.

4. The rotor core according to claim 1, characterized in that: No more than N3 and at least one of the second side edges has a third protrusion at an end close to the rotation axis, and the third protrusion is used to abut against an end of the permanent magnet close to the rotation axis; Among them, 1≤N3<M1.

5. The rotor core according to claim 1, characterized in that: One of the core units is a second core unit, the second core unit is disconnected from the other core units along the circumferential direction of the rotation axis, the first core unit and the second core unit are arranged adjacently and spaced apart, the second core unit comprises M2 second laminations stacked in a direction parallel to the rotation axis, each of the second laminations has a third side facing the first side; No more than N4 and at least one of the third sides has a fourth protrusion at an end close to the rotation axis, and the fourth protrusion is used to abut against an end of the permanent magnet close to the rotation axis; Among them, 1≤N4<M2.

6. The rotor core according to claim 1, characterized in that: One of the core units is a second core unit, the second core unit is disconnected from the other core units along the circumferential direction of the rotation axis, the first core unit and the second core unit are arranged adjacent to each other, the second core unit includes a plurality of second laminations stacked in a direction parallel to the rotation axis, and each of the second laminations has a third side facing the first side; Along the circumferential direction of the rotation axis, a minimum dimension L1 of the first protrusion from the third side and a maximum dimension L2 of the first side from the third side satisfy: 0.3≤L1 / L2<0.

95.

7. The rotor core according to claim 1, characterized in that: At least one of the first side edges has a second protrusion at an end away from the rotation axis, and the second protrusion is used to abut against an end of the permanent magnet away from the rotation axis; One of the core units is a second core unit, the second core unit is disconnected from the other core units along the circumferential direction of the rotation axis, the first core unit and the second core unit are arranged adjacent to each other, the second core unit includes a plurality of second laminations stacked in a direction parallel to the rotation axis, and each of the second laminations has a third side facing the first side; Along the circumferential direction of the rotation axis, a minimum dimension L3 of the second protrusion from the third side and a maximum dimension L4 of the first side from the third side satisfy: 0.5≤L3 / L4<0.

95.

8. The rotor core according to claim 1, characterized in that: The total number of the first laminations in the first core unit is M3, wherein the ends of the first sides of N3 first laminations close to the rotation axis have a first protrusion, and M3>2N3.

9. The rotor core according to claim 1, characterized in that: Along a direction parallel to the rotation axis, in every two adjacent first laminates, at most one end of the first side edges close to the rotation axis has the first protrusion.

10. The rotor core according to claim 1, characterized in that: The rotor core has a first plane, which is perpendicular to the rotation axis. The first laminations are symmetrically arranged about the first plane. Along a direction parallel to the rotation axis, at least one end of the first side edge on both sides of the first plane close to the rotation axis has the first protrusion.

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

12. A rotor assembly, characterized in that: include: The rotor core according to any one of claims 1 to 11; The plurality of permanent magnets are arranged in the accommodation space.

13. A motor, characterized in that: include: The rotor assembly of claim 12; as well as, Stator assembly.

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