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, one of the iron core units is a first iron core unit, and the first iron core unit is disconnected from other iron core units along the circumferential direction of the rotation axis; the first iron core unit comprises a plurality of laminations which are arranged in a laminated mode in the direction parallel to the rotating axis, one of the laminations is the first lamination, and the first lamination comprises a first side edge and a second side edge which are oppositely arranged in the circumferential direction of the rotating axis; the end, close to the rotating axis, of the first side edge is provided with a first protrusion, the first protrusion comprises an abutting part and a spacing part, the spacing part is connected between the abutting part and the first side edge, and the spacing part is used for defining a first gap together with the permanent magnet. According to the rotor core, the magnetic leakage effect can be reduced, the motor power density and the rotor material utilization rate are improved, and mounting and fixing 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 a plurality of sector-shaped units arranged adjacently and spaced along the circumferential direction, and a limiting body or annular portion extending circumferentially is provided on the inner side of the sector-shaped unit. The limiting body or annular portion on the inner side of the above-mentioned sector-shaped unit can limit the permanent magnet, and the above-mentioned limiting structure has a wall surface extending circumferentially and abutting against the permanent magnet. Under this design, if the supporting stability of the limiting structure for the permanent magnet is to be enhanced, it is necessary to increase the circumferential extension length of the limiting structure. At this time, the contact area between the limiting structure and the permanent magnet will increase at the same time, and then the increase in the contact area will increase the leakage magnetic effect. If the circumferential extension length of the limiting structure is shortened, it is easy to cause unstable support of the permanent magnet and reduce the manufacturability of the rotor core.

[0003] Therefore, how to reduce the magnetic leakage effect of the permanent magnet motor while taking into account 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 a plurality of laminations stacked in a direction parallel to the rotation axis, one of the laminations is a first lamination, and the first lamination includes a first side and a second side that are oppositely arranged in a circumferential direction of the rotation axis;

[0008] Among them, the first side has a first protrusion at one end close to the rotation axis, and the first protrusion includes an abutting portion and a spacing portion. The abutting portion is used to abut the end of the permanent magnet close to the rotation axis. The spacing portion is connected between the abutting portion and the first side, and the spacing portion is used to define a first gap together with the permanent magnet.

[0009] In some embodiments, the first protrusion has a first wall surface and a second wall surface facing the end of the permanent magnet close to the rotation axis, the first wall surface is used to abut the end of the permanent magnet close to the rotation axis, and the second wall surface and the end of the permanent magnet close to the rotation axis jointly define a first gap;

[0010] The third wall of the permanent magnet for contacting the first protrusion is parallel to the rotation axis. In the radial direction perpendicular to the rotation axis, the maximum dimension H1 of the first wall from the third wall and the maximum dimension H2 of the second wall from the third wall satisfy: 0≤H1 <H2。

[0011] In some embodiments, along the circumference of the rotation axis, the abutment portion is located at an end of the first protrusion away from the first side.

[0012] In some embodiments, an end of the first side away from the rotation axis has a second protrusion, and the second protrusion is used to abut against an end of the permanent magnet away from the rotation axis.

[0013] In some embodiments, an end of the second protrusion close to the permanent magnet and an end of the permanent magnet far from the rotation axis jointly define a second gap.

[0014] 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.

[0015] In some embodiments, one of the core units is a second core unit, the second core unit is disconnected from the other core units, and the first core unit and the second core unit are arranged adjacently and spaced apart along the circumferential direction of the rotation axis, the second core unit includes a plurality of laminations, one of the laminations is a second lamination, and each second lamination has a third side facing the first side;

[0016] 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.

[0017] In some embodiments, one of the core units is a second core unit, 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 along the circumferential direction of the rotation axis, the second core unit includes a plurality of laminations, one of the laminations is a second lamination, and the second lamination has a third side facing the first side;

[0018] 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.

[0019] In some embodiments, the total number of laminations in the first core unit is M, including N first laminations, and M>2N.

[0020] In some embodiments, along a direction parallel to the rotation axis, at most one laminate among every two adjacent laminates is a first laminate.

[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. A first protrusion for abutting against a limiting permanent magnet is provided at one end of the axis of the first lamination close to the axis of rotation. And the end of the first protrusion close to the permanent magnet and the end of the permanent magnet close to the axis of rotation can jointly define a first gap. Compared with the design in the prior art that the rotor core limiting structure forms a circumferential surface contact with the permanent magnet, the rotor core of the present invention is provided with a first gap between the first protrusion and the permanent magnet, and the first gap is located between the end of the first protrusion for abutting against the permanent magnet and the first side edge, so that the first protrusion can increase the circumferential extension length while only increasing the space occupied by the first gap, while the contact area with the permanent magnet remains unchanged, thereby reducing the leakage magnetic effect caused by the extension of the first protrusion. Therefore, the present invention can reduce the leakage magnetic effect, improve the power density of the motor, and does not affect the installation and fixation of the permanent magnet. 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 A schematic side view of a first laminate provided in a third embodiment of the present invention;

[0036] Figure 6 A side view schematic diagram of a rotor core and a permanent magnet combined in a first embodiment of the present invention;

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

[0038] Figure 8 A side view schematic diagram of a rotor core and a permanent magnet combined in a fourth embodiment of the present invention;

[0039] Fig. 9 for Figure 8 The enlarged schematic diagram of point B in the middle;

[0040] Fig.10 for Figure 6 The enlarged size schematic diagram of A in the middle;

[0041] Fig.11 A side view schematic diagram of relatively arranged laminations in a fourth embodiment of the present invention

[0042] Fig.12 is a side view schematic diagram of relatively arranged laminations in a fifth embodiment of the present invention;

[0043] Fig.13 is a side view schematic diagram of relatively arranged laminations in a sixth embodiment of the present invention;

[0044] Fig.14 is a side view schematic diagram of relatively arranged laminations in a seventh embodiment of the present invention;

[0045] Fig.15 is a side view schematic diagram of relatively arranged laminations in an eighth embodiment of the present invention;

[0046] Fig.16is a side view schematic diagram of relatively arranged laminations in a ninth embodiment of the present invention;

[0047] Fig.17 It is a three-dimensional schematic diagram of a first core unit provided in an eleventh embodiment of the present invention;

[0048] Fig.18 is a three-dimensional schematic diagram of a first core unit provided in a twelfth embodiment of the present invention;

[0049] Fig.19 A schematic side view of a rotor assembly is provided for an embodiment of another aspect of the present invention.

[0050] Description of Figure Numbers:

[0051] 50- rotor core; 51- sector unit; 52- limiter;

[0052] 10- rotor core;

[0053] 100-core unit; 100a-first core unit; 100b-second core unit;

[0054] 110-laminate; 110a-first laminate; 110b-second laminate;

[0055] 111a-first side; 1111a-first protrusion; 11111a-abutting portion; 11112a-spacer; 11113a-first wall; 11114a-second wall; 1112a-second protrusion; 112a-second side; 1121a-third protrusion;

[0056] 111b-third side; 1111b-fourth protrusion;

[0057] 120-accommodation space;

[0058] 130-first gap;

[0059] P-first plane;

[0060] 200 - rotor assembly; 210 - permanent magnet; 2101 - third wall; 220 - rotating 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 a plurality of sector-shaped units 51 arranged at adjacent intervals in the circumferential direction, and a limiting body 52 or an annular portion extending in the circumferential direction is provided inside the sector-shaped unit 51. The limiting body 52 or the annular portion inside the above-mentioned sector-shaped unit can limit the permanent magnet, and both have a wall surface extending in the circumferential direction and abutting against the permanent magnet. Under this design, if the supporting stability of the limiting structure for the permanent magnet is to be enhanced, it is necessary to increase the circumferential extension length of the limiting structure, at which time the contact area between the limiting structure and the permanent magnet will increase at the same time, and the increase in the contact area will increase the leakage magnetic effect. If the circumferential extension length of the limiting structure is shortened, it is easy to cause unstable support of the permanent magnet, and the manufacturability of the rotor core 50 is reduced.

[0066] In view of this, see Figure 2-Figure 18 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 space between two adjacent core units 100 that can accommodate the permanent magnet 210.

[0068] See also Figure 2 In 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] See also Figure 2-Figure 3, one of the core units 100 is the first core unit 100a. Along the circumferential direction of the axis of rotation, the first core unit 100a 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 200 and 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 3-Figure 5 , the first core unit 100a includes a plurality of laminations 110 stacked in a direction parallel to the rotation axis, and one of the laminations is a first lamination 110a. It is understandable that at least one of the laminations 110 is a first lamination 110a, so in some embodiments, each lamination in the first core unit 100a may include a plurality of first laminations 110a. The first lamination 110a includes a first side 111a and a second side 112a arranged opposite to each other in the circumferential direction of the rotation axis. The first side 111a has a first protrusion 1111a at one end close to the rotation axis. 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 may be located on the wall of the same side or on different walls respectively.

[0072] Corresponding to the arrangement of the first protrusion 1111a described above. In some embodiments, the end of the first protrusion 1111a close to and in contact with the permanent magnet 210 and the end of the permanent magnet 210 close to the rotation axis can jointly define the first gap 130. For details, see Figure 6-Figure 9 The first protrusion 1111a includes an abutting portion 11111a and a spacing portion 11112a, the abutting portion 11111a is used to abut against one end of the permanent magnet 210 close to the rotation axis, the spacing portion 11112a is connected between the abutting portion 11111a and the first side 111a, and the spacing portion 11112a is used to define the first gap 130 together with the permanent magnet 210. It can be understood that the abutting portion 11111a is used to abut against the permanent magnet, and the spacing portion 11112a is provided between the abutting portion 11111a and the first side 111a, and the end of the spacing portion 11112a facing the permanent magnet 210 and the end of the permanent magnet 210 facing the rotation axis can jointly define the first gap 130.

[0073] See also Figure 6-Figure 9In some embodiments, along the circumference of the rotation axis, the abutment portion 11111a may be located at the end of the first protrusion 1111a away from the first side 111a. In other embodiments, along the circumference of the rotation axis, the abutment portion 11111a may be located at the middle end of the first protrusion 1111a away from the first side 111a, and the side of the middle end away from the first side 111a may also be connected to the end of the first protrusion 1111a away from the first side 111a.

[0074] In some embodiments, to form the first gap 130, the first protrusion 1111a may have a curved portion and an abutting portion 11111a. The curved portion may extend in the direction of the permanent magnet 210 close to the rotation axis, so that the first gap 130 may be defined together with one end of the permanent magnet 210 close to the rotation axis. Along the circumference of the rotation axis, the first gap 130 is located between the end of the first protrusion 1111a away from the permanent magnet 210 and the first side 111a. It is understood that the first gap 130 may be located between the end of the first protrusion 1111a used to abut the permanent magnet 210 and the first side 111a. The abutting portion 11111a may be used to abut one end of the permanent magnet 210 close to the rotation axis to form a limiting effect on the permanent magnet 210. By setting the above-mentioned first gap 130, the contact area between the first protrusion 1111a and the permanent magnet 210 can be reduced without affecting the limiting function of the first protrusion 1111a. Compared with the limiting form in which the entire wall extending in the circumferential direction contacts the permanent magnet, the first protrusion 1111a of the present invention does not increase the contact area between the first protrusion 1111a and the permanent magnet 210 while increasing the circumferential extension length, thereby avoiding the increase of the leakage magnetic effect to a certain extent.

[0075] For details, see Figure 6-Figure 9 In some embodiments, the first gap 130 may be defined by the first protrusion 1111a having a curved wall surface and the permanent magnet 210. Figure 8-Figure 9 In some embodiments, the first gap 130 may be defined by the permanent magnet 210 having a curved wall surface and the first protrusion 1111 a .

[0076] In some embodiments, the first gap 130 may be filled with injection molding material, so that the injection molding material can further connect the first protrusion 1111a and the permanent magnet 210, thereby enhancing the tightness of the connection of the rotor core 10 and strengthening the rotor bonding force.

[0077] The first protrusion 1111a is used to limit the displacement of the permanent magnet 210 in the direction close to the axis of rotation. It is understandable that the first protrusion 1111a is used to abut one end of the permanent magnet 210 away from the axis of rotation, 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 1111a. The first protrusion 1111a can extend along the first circumferential direction. The first protrusion 1111a can have an abutting end face facing the permanent magnet 210 and used to abut the permanent magnet 210, and the abutting 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.

[0078] 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 same wall surface 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.

[0079] 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, the first core unit 100a having a plurality of laminations, one of which is a first lamination 110a. The first lamination 110a has a first protrusion 1111a at one end close to the rotation axis, and the first protrusion 1111a can abut against one end of the permanent magnet 210 away from the rotation axis. And the end of the first protrusion 1111a close to the permanent magnet 210 and the end of the permanent magnet 210 close to the rotation axis can jointly define a first gap 130. It can be understood that the above arrangement 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 for limiting the permanent magnet 210, and the first gap 130 can be formed between the first protrusion 1111a and the permanent magnet 210. Therefore, compared with the design in the prior art that the limiting structure of the rotor core 10 forms a circumferential surface contact with the permanent magnet 210, the rotor core 10 of the present invention is provided with a first gap 130 between the first protrusion 1111a and the permanent magnet 210, and the first gap 130 is located between the end of the first protrusion 1111a for abutting the permanent magnet 210 and the first side 111a, so that the first protrusion 1111a can increase the circumferential extension length while only increasing the space occupied by the first gap 130, while the contact area with the permanent magnet 210 remains unchanged, thereby reducing the leakage magnetic effect caused by the extension of the first protrusion 1111a. Therefore, the present invention can reduce the leakage magnetic effect and improve the power density of the motor without affecting the installation and fixation of the permanent magnet.

[0080] See also Fig.10 The first protrusion 1111a may have a first wall surface 11113a and a second wall surface 11114a facing the end of the permanent magnet 210 close to the rotation axis. The first wall surface 11113a may be used to abut against the end of the permanent magnet 210 close to the rotation axis. The second wall surface 11114a and the end of the permanent magnet 210 close to the rotation axis may jointly define a first gap 130.

[0081] See also Fig.10, the permanent magnet 210 is used to abut against the third wall surface 2101 of the first protrusion 1111a, and the third wall surface 2101 is parallel to the rotation axis. Along the radial direction perpendicular to the rotation axis, the maximum distance H1 between the first wall surface 11113a and the third wall surface 2101 and the maximum distance H2 between the second wall surface 11114a and the third wall surface 2101 satisfy: 0 ≤ H1 < H2. It can be understood that the first wall surface 11113a is closer to the third wall surface 2101 (permanent magnet 210) and is used to abut against the permanent magnet 210, and the second wall surface 11114a is farther from the third wall surface 2101 (permanent magnet 210) and defines a gap. When the first wall surface 11113a directly abuts against the permanent magnet 210, the value of H1 can be 0; when the first wall surface 11113a indirectly abuts against the permanent magnet 210, the value can be greater than 0.

[0082] See Figure 6-Figure 10 , in some embodiments, the third wall surface 2101 against which the permanent magnet 210 is used to abut the first protrusion 1111a can be parallel to the rotation axis. The first protrusion 1111a extends along the first direction from the first side 111a. The dimension of the first protrusion 1111a from the third wall surface 2101 reaches the maximum value first and then the minimum value along the first direction. It can be understood that in the above embodiments, during the extension of the first protrusion 1111a along the first direction, the first gap 130 is jointly defined by the second wall surface 11114a and the permanent magnet 210 first, and then the first wall surface 11113a contacts the permanent magnet 210, so as to play a limiting role. The above settings can make the extension section close to the first side form a gap with the permanent magnet 210 along the first direction, and the extension section far from the first side 111a contacts the permanent magnet 210, so that the leakage magnetic effect generated during the extension of the first protrusion 1111a is less.

[0083] It can be understood that in the above embodiments, the first protrusion 1111a is used to limit the displacement of the permanent magnet 210 in the direction close to the rotation axis. And in some embodiments, it is also necessary to limit the displacement of the permanent magnet 210 in other directions to improve manufacturability. Therefore, see Figure 4 , in some embodiments, the end of the first side 111a far from the rotation axis can have a second protrusion 1112a. 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 provided at the end of the first side 111a far from the rotation axis. In this embodiment, the setting of the second protrusion 1112a can correspond to the setting of the first protrusion 1111a, and the difference is that the limiting direction of the second protrusion 1112a is opposite to that of the first protrusion 1111a. For the structure of the second protrusion 1112a, reference can be made to the above first protrusion 1111a, which will not be elaborated here.

[0084] It should be noted that the second protrusion 1112a can be provided at the end of the first side 111a away from the rotation axis in the above embodiment. This embodiment can reduce the number of molds and manufacturing costs while providing a distal protrusion limiting structure. Fig.13 In other embodiments, other laminations (e.g., laminations 110 arranged adjacent to and spaced from the first lamination 110a along the circumference of the rotation axis) may also be provided with a protrusion structure at one end of the side away from the rotation axis. It is understandable that, in this embodiment, other laminations may also be provided with a structure similar to the second protrusion 1112a at one end away from the rotation axis.

[0085] In some embodiments, in order to increase the improvement effect of the gap setting on the leakage magnetic effect. Corresponding to the setting of the second protrusion 1112a, in some embodiments, the end of the second protrusion 1112a close to the permanent magnet 210 and the end of the permanent magnet 210 away from the axis of rotation can jointly define a second gap. It can be understood that the setting of the second gap can be similar to the above-mentioned first gap 130, except that the gap is set at the connection between the second protrusion 1112a and the permanent magnet. Through the above-mentioned setting, the contact area between the second protrusion 1112a and the permanent magnet 210 can be reduced without affecting the limiting function of the second protrusion 1112a.

[0086] See also Figure 11-Figure 14 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.

[0087] See also Figure 11-Figure 14 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.

[0088] 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. Fig.11 In the embodiment of the first aspect, the first laminate 110a may further include a second side 112a. The second side 112a is arranged opposite to the first side 111a along the circumference of the rotation axis. The second side 112a may have a third protrusion 1121a at one end close to the rotation axis. The third protrusion 1121a may be used to limit the displacement of the permanent magnet 210 in the direction close to the rotation axis (the third protrusion 1121a may be used to abut against the end of the permanent magnet 210 away from the rotation axis). In order to facilitate the first protrusion 1111a and the third protrusion 1121a to form a limiting effect together, for the embodiment in which the first protrusion 1111a extends along the first circumferential direction, in some embodiments, the third protrusion 1121a may extend in the opposite direction of the first circumferential direction. It can be understood that, similar to the first protrusion 1111a, the third protrusion 1121a may be provided at one end close to the rotation axis, and the third side 111b is opposite to the first side 111a along the circumference of the rotation axis. In this embodiment, two adjacent first core units 100a may be provided to define a housing space 120, and the housing space 120 is defined by a first side 111a and a second side 112a that are arranged oppositely along the circumferential direction of the rotation axis. It is understandable that in this embodiment, two protrusions are provided on two opposite sides of the first laminate 110a, and through the two first core units 100a (first laminate 110a) arranged along the circumferential direction, the two protrusion structures can jointly limit the permanent magnet 210 in the housing space 120.

[0089] 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.

[0090] See also Fig.12 In an 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 circumferential direction 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 100b includes a plurality of laminations, one of each of which is a second lamination 110b. The second lamination 110b includes a third side 111b. An end of the third side 111b close to the rotation axis may have a fourth protrusion 1111b. Along the circumferential direction of the rotation axis, the fourth protrusion 1111b and the first protrusion 1111a are arranged relative to each other. The fourth protrusion 1111b may be used to abut against an end of the permanent magnet 210 away from the rotation axis, and it can be understood that the fourth protrusion 1111b is used to limit the displacement of the permanent magnet 210 in a 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 at one end close to the rotation axis.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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. Fig.11 In an embodiment of the third aspect, the first lamination 110a may further include a second side 112a. Along the circumference of the rotation axis, the second side 112a is arranged opposite to the first side 111a. The end of the second side 112a away from the rotation axis may have a fifth protrusion. The third protrusion 1121a may be used to limit the displacement of the permanent magnet 210 in a direction away from the rotation axis. The setting of the fifth protrusion may be considered to be similar to the setting of the third protrusion 1121a described above, except that the fifth protrusion is provided at the end of the second side 112a away from the rotation axis.

[0095] See also Fig.12In an embodiment of the fourth aspect, one of the core units 100 may be a third core unit 100. The third core unit 100 is disconnected from the other core units. Along the circumference of the rotation axis, the first core unit 100a and the third core unit 100 may be arranged adjacently and spaced apart. The third core unit 100 includes a plurality of laminations, and one of the laminations may be a second lamination 110b. The second lamination 110b includes a third side 111b. The end of the third side 111b away from the rotation axis may have a sixth protrusion. The sixth protrusion is used to limit the displacement of the permanent magnet 210 in a direction away from the rotation axis. The setting of the sixth protrusion can be considered to be similar to the setting of the fourth protrusion 1111b described above, except that the sixth protrusion is provided at the end of the second side 112a away from the rotation axis.

[0096] 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.

[0097] In order to make the fixed limiting effect of the rotor core 10 on the permanent magnet 210 more reliable, in some embodiments, the laminations 110 of two adjacent core units 100 have at least one protrusion at one end close to the rotation axis and at least one protrusion 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.

[0098] 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 laminated sheets 110 structures located at both ends of the permanent magnet 210 , thereby increasing the versatility of the laminated sheets 110 , reducing the number of molds for the laminated sheets 110 , and reducing the manufacturing cost of the laminated sheets 110 .

[0099] See also Fig.13 In other embodiments, along the circumferential direction of the rotation axis, at least one protrusion (which may be the first protrusion 1111a) 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.

[0100] In some embodiments, the circumferential 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.

[0101] Specifically, for the structure at the inner 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. The 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.

[0102] See also Figure 15-16 In some embodiments, 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 satisfy: 0.3≤L1 / L2<0.95. Exemplarily, L1 / L2 may be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc. In some embodiments, L2 may correspond to the maximum arc length of the first side 111a and the third side 111b along the circumference; correspondingly, L1 may correspond to the minimum arc length of the first protrusion 1111a and the third side 111b along the circumference. 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.

[0103] Correspondingly, for the structure at the periphery of the core unit 100. Figure 12-13 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. The 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.

[0104] See also Figure 15-16 In some embodiments, 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 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.

[0105] 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. Therefore, in some embodiments, the rotor core can have a first plane P, and the first plane P is perpendicular to the rotation axis. Each lamination 110 can be arranged symmetrically about the first plane P, and there is at least one first lamination 110a on both sides of the first plane P in the direction parallel to the rotation axis. It can be understood that, in the direction parallel to the rotation axis, the multiple laminations 110 are symmetrically distributed relative to the first plane P (when the total number of laminations 110 is an odd number, the first plane P can pass through the lamination 110 located in the middle). It can be understood that, in the direction parallel to the rotation axis, the multiple laminations 110 can be distributed on both sides of the first plane P (can be evenly distributed or unevenly distributed), and at least one lamination 110 on each side is a first lamination 110a. The above arrangement enables the first protrusion 1111a to be correspondingly located on both sides of the permanent magnet 210 in a direction parallel to the rotation axis, thereby making the limiting effect of the first protrusion 1111a 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.

[0106] 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 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 laminations 110 between the two ends close to the rotation axis do not have the first protrusions 1111a.

[0107] Further, for embodiments in which the core unit 100 includes second laminations 110b, in some embodiments, each lamination 110 is symmetrically arranged about the first plane P, and there is at least one second lamination 110b on both sides of the first plane P along a direction parallel to the rotation axis.

[0108] In order to further reduce the magnetic leakage effect of the rotor core 10, in some embodiments, the total number of laminations 110 in the first core unit 100 is M, including N first laminations 110a, and M>2N. It can be understood that in this embodiment, the total number of laminations 110 (M) in the direction parallel to the rotation axis of the first core unit 100a is greater than twice the number of first laminations 110a with first protrusions 1111a. That is, among the above-mentioned M laminations 110a, the number of laminations 110 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 M is greater than or equal to 3. It is understandable that the above arrangement can make the majority of the laminations 110 in the direction parallel to the rotation axis not have the first protrusion 1111a, and the minority (at least one) of the laminations 110 are the first laminations 110a and have the first protrusion 1111a, so as to ensure the limiting effect and reduce the leakage magnetic 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.

[0109] 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 17-Figure 18 In some embodiments, in the direction parallel to the rotation axis, at most one of every two adjacent laminations 110 is a first lamination 110a. It is understandable that in this embodiment, the types of two adjacent laminations 110 may include two situations, one situation is that one of the laminations 110a has a first protrusion 1111a, and the other lamination 110 does not have a first protrusion 1111a; the other situation is that both laminations 110 do not have a first protrusion 1111a. The above-mentioned setting can make a certain gap between the multiple first protrusions 1111a in 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.

[0110] Further, for the embodiment in which the plurality of laminations 110 include the first lamination 110a and the second lamination 110b (or include the first lamination 110a and other laminations with protrusions), in some embodiments, along the direction parallel to the rotation axis, at most one lamination 110 of every two adjacent laminations 110 has a protrusion (including the first protrusion 1111a) at the end close to the rotation axis. It can be understood that in this embodiment, the scope of the above embodiment is expanded from the first lamination 110a to all laminations with protrusions.

[0111] 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. 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 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.

[0112] According to the use requirements of the rotor core 10, in some embodiments, the multiple laminations 110 of the core unit 100 can be used in combination with each other. For example, the first core unit 100a can also include the second lamination 110b; similarly, the second core unit 100b or other core units 100 can include the first lamination 110a. In addition, when viewed in a direction parallel to the rotation axis, the multiple core units 100 along the circumference of the rotation axis can be used in combination with each other. For example, the rotor core 10 can include the first core unit 100a in the above different embodiments or the second core unit 100b in the above different embodiments.

[0113] 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.

[0114] See also Fig.19The 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.

[0115] 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.

[0116] 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.

[0117] 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 is a first lamination, and the first lamination includes a first side and a second side that are arranged opposite to each other in a circumferential direction of the rotation axis; Among them, the end of the first side close to the rotation axis has a first protrusion, the first protrusion includes a butt joint and a spacer, the butt joint is used to butt joint the end of the permanent magnet close to the rotation axis, the spacer is connected between the butt joint and the first side, and the spacer is used to define a first gap together with the permanent magnet.

2. The rotor core according to claim 1, characterized in that: The first protrusion has a first wall surface and a second wall surface facing the end of the permanent magnet close to the rotation axis, the first wall surface is used to abut the end of the permanent magnet close to the rotation axis, and the second wall surface and the end of the permanent magnet close to the rotation axis jointly define the first gap; The third wall surface of the permanent magnet used to abut the first protrusion is parallel to the rotation axis. Along the radial direction perpendicular to the rotation axis, the maximum dimension H1 of the first wall surface from the third wall surface and the maximum dimension H2 of the second wall surface from the third wall surface satisfy: 0≤H1 <H2。 3. The rotor core according to claim 1, characterized in that: Along the circumferential direction of the rotation axis, the abutment portion is located at an end of the first protrusion away from the first side.

4. The rotor core according to claim 1, characterized in that: An end of the first side away from the rotation axis has a second protrusion, and the second protrusion is used to abut against an end of the permanent magnet away from the rotation axis.

5. The rotor core according to claim 4, characterized in that: An end of the second protrusion close to the permanent magnet and an end of the permanent magnet away from the rotation axis jointly define a second gap.

6. The rotor core according to claim 4, characterized in that: One of the core units is a second core unit, the second core unit is disconnected from the other core units, the first core unit and the second core unit are arranged adjacent to each other in a circumferential direction of the rotation axis, the second core unit includes a plurality of laminations, one of the laminations is a second lamination, and the second lamination 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.

7. 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, the first core unit and the second core unit are arranged adjacent to each other in a spaced relationship along the circumferential direction of the rotation axis, the second core unit comprises a plurality of laminations, one of the laminations is a second lamination, 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.

8. 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.

9. The rotor core according to claim 1, characterized in that: The total number of the laminations in the first core unit is M, including N first laminations, and M>2N.

10. The rotor core according to claim 1, characterized in that: Along a direction parallel to the rotation axis, at most one of every two adjacent laminations is the first lamination.

11. 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 laminations are symmetrically arranged about the first plane. Along a direction parallel to the rotation axis, there is at least one first lamination on both sides of the first plane.

12. 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.

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

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

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