CN220210059U - Rotor core, rotor assembly and motor - Google Patents

Abstract

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

Description

Rotor core, rotor assembly and motor

Technical Field

The utility model relates to the technical field of motors, in particular to a rotor core, a rotor assembly and a motor.

Background

The permanent magnet synchronous motor has the characteristics of high efficiency, high power density and quick response, and is widely used in the field of household appliances. In the existing rotor core, a limiting body extending along the circumferential direction is arranged on the inner side of a fan-shaped unit. The limiting body can limit the permanent magnet, the limiting body is provided with a limiting wall surface which extends along the circumferential direction and is close to the permanent magnet, and the limiting wall surface is connected with the rotating axis of the rotor core through an injection molding body. Under this design, because the rotor core rotates along circumference and spacing wall extends along circumference when operating condition for spacing wall produces along circumference relative displacement with the injection molding easily. Along with the rotary motion of the rotor core, the connection between the limiting wall surface and the injection molding body is easy to loosen or separate, so that the usability of the rotor core can be affected.

Disclosure of Invention

The main purpose of the utility model is to provide a rotor core, which can enhance the connection tightness between the rotor core and an injection molding body.

In order to achieve the above purpose, the embodiment of the present utility model adopts the following technical scheme:

a rotor core includes a plurality of core units arranged around a rotational axis of the rotor core, each adjacent two core units defining an accommodation space therebetween for accommodating a permanent magnet, one of the core units being a first core unit which is disconnected from the other core units in a circumferential direction of the rotational axis;

the first core unit includes a plurality of laminations arranged in a stacked manner in a direction parallel to the rotational axis, one of the laminations being a first lamination;

the side edge of the first lamination facing the rotation axis is provided with a first groove body recessed in a direction away from the rotation axis.

In some embodiments, the first lamination includes a first side and a second side disposed opposite each other along a circumference of the rotation axis, the first slot is defined by a first wall, a second wall, and a third wall of the first lamination proximate the rotation axis, the first wall is connected to the first side, the second wall is connected to the second side, and the third wall is located between the first wall and the second wall along the circumference of the rotation axis;

the first groove body is defined by one end of the first wall surface, one end of the second wall surface and the third wall surface along the circumferential direction of the rotation axis,

and/or the number of the groups of groups,

the first groove body comprises a first groove part and a second groove part, the first groove part is defined by a first wall surface and one end, close to the first side edge, of a third wall surface along the circumferential direction of the rotation axis, and the second groove part is defined by a second wall surface and one end, close to the second side edge, of the third wall surface.

In some embodiments, the first lamination includes a first side and a second side that are disposed opposite each other along a circumference of the rotation axis, an end of the first side near the rotation axis has a first protrusion, and the first slot is disposed on a side of the first protrusion near the rotation axis.

In some embodiments, the side of the first lamination remote from the axis of rotation has a second slot recessed in a direction toward the axis of rotation.

In some embodiments, the first lamination is symmetrically arranged about a first plane, the axis of rotation is located in the first plane, and the first slot is symmetrically arranged about the first plane.

In some embodiments, each lamination shape structure of the first core unit is the same;

or,

the number of laminations of the first core unit is an even number N, and at least N/2 of the laminations have the same shape as the first laminations;

or,

the number of laminations of the first core unit is an odd number M, and at least (M-1)/2 of the laminations have the same shape as the first laminations.

In some embodiments, the rotor core has a second plane perpendicular to the axis of rotation, each lamination being symmetrically arranged about the second plane, with at least one first lamination on either side of the second plane in a direction parallel to the axis of rotation.

In some embodiments, each core unit is disconnected from each other, and the shape and structure of each core unit are the same.

Embodiments of the second aspect of the present utility model also provide a rotor assembly comprising:

the rotor core of any one of the above;

the permanent magnets are arranged in the accommodating space.

Embodiments of the third aspect of the present utility model also provide an electric machine comprising:

a rotor assembly according to any one of the preceding claims; the method comprises the steps of,

a stator assembly.

Compared with the prior art, the utility model has the beneficial effects that:

the rotor core of the utility model comprises a plurality of core units, wherein the core units comprise a first core unit, the first core unit is provided with a plurality of laminations, one of the laminations is a first lamination, and the side edge of the first lamination facing the rotation axis is provided with a first groove body which is recessed in a direction away from the rotation axis. Compared with the flat lamination end structure design in the prior art, the utility model has the advantages that the first groove body is arranged at one end of the first lamination, so that injection molding around the first lamination can be filled into the first groove body, the first groove body and the injection molding are matched to form a clamping structure in the rotating process of the rotor core, and the connection tightness between the rotor core and the injection molding is enhanced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic side view of a prior art rotor core;

fig. 2 is a schematic side view of a rotor core provided in a first embodiment of the present utility model;

fig. 3 is a schematic perspective view of a first core unit according to a second embodiment of the present utility model;

FIG. 4 is a schematic side view of a first laminate provided in a first embodiment of the utility model;

FIG. 5 is an enlarged schematic view of FIG. 4 at A;

FIG. 6 is a schematic side view of a first laminate provided in a third embodiment of the utility model;

FIG. 7 is an enlarged schematic view at B in FIG. 6;

FIG. 8 is a schematic side view of a first laminate in a fourth embodiment of the utility model;

fig. 9 is a schematic perspective view of a first core unit provided in a fifth embodiment of the present utility model;

fig. 10 is a schematic perspective view of a first core unit according to a sixth embodiment of the present utility model;

fig. 11 is a schematic side view of a rotor assembly provided in accordance with an embodiment of another aspect of the present utility model.

Reference numerals illustrate:

50-rotor core; 51-sector units; 52-limiting body; 521-limiting wall surfaces; an injection body 53;

10-rotor core;

100-a first core unit;

110-a first lamination; 111-a first tank; 1111—a first wall; 1112-a second wall; 1113-a third wall; 1114—a first groove portion; 1115-a second groove portion; 112-a first side; 1121-a first bump;

113-a second side; 114-a second tank;

120-accommodation space;

p1-a first plane; p2-a second plane;

200-rotor assembly; 210-permanent magnet; 220-rotating shaft; 230-injection molding.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if a directional indication (such as up, down, left, right, front, and rear … …) is included in the embodiment of the present utility model, the directional indication is merely used to explain a relative positional relationship, a movement condition, and the like between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or", "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B ", including a scheme, a or B scheme, and a or B scheme that is satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1, a conventional rotor core 50 is provided with a stopper 52 extending in a circumferential direction inside a fan-shaped unit 51. The limiting body 52 can limit the permanent magnet, the limiting body 52 has a limiting wall 521 extending along the circumferential direction and close to the permanent magnet, and the limiting wall 521 is connected with the rotation axis of the rotor core 50 through the injection molding body 230. With this design, since the rotor core 50 rotates in the circumferential direction and the stopper wall 521 extends in the circumferential direction in the operating state, the stopper wall 521 is easily displaced relative to the injection molded body 53 in the circumferential direction. With the rotational movement of the rotor core 50, the connection between the limiting wall 521 and the injection molding body 53 is easily loosened or separated, thereby affecting the usability of the rotor core 50.

In view of this, referring to fig. 2 to 10, an embodiment of the present utility model provides a rotor core 10 capable of improving connection tightness between the rotor core 10 and an injection-molded body 230.

The rotor core 10 includes a plurality of core units arranged around a rotation axis of the rotor core 10, an accommodating space 120 is defined between two adjacent core units, the accommodating space 120 is used for accommodating the permanent magnet 210, one of the core units is a first core unit 100, and the first core unit 100 is disconnected from the other core units along the circumferential direction of the rotation axis. It will be appreciated that in some embodiments, a plurality of core units are arranged around the rotation axis to constitute a plurality of unit bodies of the rotor core 10. The iron core units can be sector-shaped when viewed along the direction parallel to the rotation axis, and the iron core units can be arranged at equal intervals along the circumferential direction of the rotation axis. Illustratively, referring to fig. 2, in the present embodiment, the rotor core 10 has ten core units. An accommodating space 120 is defined between two adjacent core units, and the accommodating space 120 is used for accommodating the permanent magnet 210. It will be appreciated that there is a gap between two adjacent core units that can accommodate the permanent magnet 210.

Referring to fig. 2, in the present embodiment, ten core units may collectively define ten accommodation spaces 120, so that the rotor assembly 300 having the rotor core 10 needs to be provided with ten permanent magnets 210 correspondingly, and the ten permanent magnets 210 are provided in the ten accommodation spaces 120 in a one-to-one correspondence. In another embodiment, there may be a space between the permanent magnets 210 and the core unit, and other materials may be filled between the two, so that the relative position between the permanent magnets 210 is fixed, or the relative position between the permanent magnets 210 and the core unit is fixed. In yet another embodiment, a plurality of permanent magnets 210 may be correspondingly disposed in a single accommodation space 120. For example, referring to fig. 2, a maximum dimension of the permanent magnet 210 in a radial direction of the rotor assembly 300 may correspond to a maximum dimension of the accommodation space 120 in a radial direction of the rotor assembly 300. According to the above arrangement, the accommodation space 120 may be defined by two wall surfaces circumferentially opposed between adjacent two core units.

The core units in the rotor core 10 may be connected to each other to maintain the integrity of the rotor core 10, or may be disconnected from each other to avoid magnetic leakage at the connection. Illustratively, referring to fig. 2, in this embodiment, each core unit is disposed apart from each other. In other embodiments, a portion of the core units are connected to each other, and each of the other portion of the core units is disconnected from the other core units.

Referring to fig. 2-3, one of the core units is a first core unit 100. The first core unit 100 is disconnected from the other core units in the circumferential direction of the rotation axis. It should be noted that, since the problem to be solved by the present utility model is the magnetic leakage effect caused by the connection/limit structure of the rotor core 10 and the above-mentioned structure is needed in the manufacturing process to improve the manufacturability, the description and illustration of the present utility model for the rotor core 10 corresponds to the state in the manufacturing process of the rotor core 10, in this embodiment, the rotor core 10 is in the state of not being assembled as the rotor assembly 300 and before injection molding. Thus, in some embodiments, the state in which the first core unit 100 is disconnected from the other core units may be understood as that the first core unit 100 is disposed separately from the other core units during the manufacturing process, and the rotor core 10 may be coupled as a whole using an injection molding process in a later step.

Referring to fig. 3 to 7, the first core unit 100 includes a plurality of laminations arranged one above the other in a direction parallel to the rotational axis, one of the laminations being the first lamination 110. It will be appreciated that at least one of the laminations is a first lamination 110, and thus in some embodiments each lamination in the first core unit 100 may include a plurality of first laminations 110.

Corresponds to the arrangement of the first protrusions 1121 described above. Referring to fig. 4-5, the side of the first lamination 110 facing the axis of rotation has a first slot 111 recessed in a direction away from the axis of rotation. In some embodiments, the first slot 111 may be used to fill the injection molding body 230, so that the first slot 111 may cooperate with the injection molding body 230 on the side of the rotor core 10 near the rotation axis to form a clamping structure.

According to a combination of the above embodiments, it can be derived that in some embodiments, the rotor core 10 of the present utility model comprises a plurality of core units including the first core unit 100, the first core unit 100 having a plurality of laminations, and one of the laminations being the first lamination 110. The side of the first lamination 110 facing the axis of rotation has a first slot 111 recessed in a direction away from the axis of rotation. It will be appreciated that the above arrangement may be such that the rotor core 10 has at least one first core unit 100, and that the first core unit 100 includes at least one first lamination 110 having a first slot 111. Compared with the flat lamination end structure design in the prior art, the utility model arranges the first groove body 111 at one end of the first lamination 110, so that the injection molding body 230 around the first lamination 110 can be filled into the first groove body 111, thereby the first groove body 111 and the injection molding body 230 cooperate to form a clamping structure in the rotating process of the rotor core, and the connection tightness between the rotor core and the injection molding body 230 is enhanced.

For the specific structure of the first tank 111. Referring to fig. 4-7, in some embodiments, the first lamination 110 may include a first side 112 and a second side 113 disposed opposite each other along a circumference of the rotational axis. The first groove 111 is defined by a first wall 1111, a second wall 1112, and a third wall 1113 of the first lamination 110 near the rotation axis, along the circumferential direction of the rotation axis. The first wall 1111 is connected to the first side 112, the second wall 1112 is connected to the second side 113, and the third wall 1113 is located between the first wall 1111 and the second wall 1112. It will be appreciated that in the present embodiment, the first groove 111 is defined by the first wall 1111 and the second wall 1112 on both sides, and the third wall 1113 in the middle, along the circumferential direction of the rotation axis.

In particular, referring to fig. 4-5, in an embodiment of an aspect, the first groove 111 may be defined by an end of the first wall 1111, an end of the second wall 1112, and the third wall 1113 in a circumferential direction of the rotation axis. It will be appreciated that in the present embodiment, the third wall 1113 is recessed in a direction away from the axis of rotation, so that the first slot 111 may be defined together with one end of the first wall 1111 and one end of the second wall 1112. Referring to fig. 6-7, in another embodiment, the first groove 111 may include a first groove 1114 and a second groove 1115, where the first groove 1114 is defined by a first wall 1111 and an end of the third wall 1113 near the first side 112, and the second groove 1115 is defined by a second wall 1112 and an end of the third wall 1113 near the second side 113, along a circumferential direction of the rotation axis. It is to be understood that in the present embodiment, the third wall 1113 is convex in a direction approaching the rotation axis, and the first wall 1111 and the second wall 1112 are concave in a direction away from the rotation axis with respect to the third wall 1113. Such that the relatively concave first wall 1111 and the end of the third wall 1113 proximate the first side 112 may collectively define a first slot 1114, and the relatively concave second wall 1112 and the end of the third wall 1113 proximate the second side 113 may collectively define a second slot 1115. Further, the first groove 111 in the above two aspects may have a symmetrical structure. Referring to fig. 8, in an embodiment of still another aspect, the first groove 111 may have an asymmetric groove structure along the circumferential direction of the rotation axis.

In some embodiments, the side of the first lamination 110 facing the axis of rotation may have a convex configuration. In particular, referring to fig. 2-7, in some embodiments, the first lamination 110 may include a first side 112 and a second side 113 disposed opposite each other along a circumference of the rotational axis. The end of the first side 112 near the rotation axis may have a first protrusion 1121. It will be appreciated that the first side 112 has one end closer to the axis of rotation and another end farther from the axis of rotation, and that the two ends may be on the same side wall or on different walls, respectively.

For the arrangement of the first protrusions 1121. In some embodiments, the first groove 111 may be disposed on a side of the first protrusion 1121 near the rotation axis. Since the first protrusion 1121 has an extension structure, providing the first groove 111 to the first protrusion 1121 may increase a corresponding groove space of the first groove 111, or may increase an extension length of the first groove 111 in the circumferential direction. In some embodiments, the first protrusion 1121 may also be used to limit displacement of the permanent magnet 210 in a direction proximate the axis of rotation. It will be appreciated that the first protrusion 1121 is configured to abut against an end of the permanent magnet 210 remote from the rotational axis, so that the displacement of the permanent magnet 210 can be limited, and the permanent magnet 210 can be easily mounted and coupled to the rotor core 10. For the structure of the first projection 1121. The first protrusion 1121 may extend in a first circumferential direction. The first protrusion 1121 may have an abutment end surface adjacent to the permanent magnet 210 for abutting the permanent magnet 210, and the abutment end surface may be a plane or a curved surface.

The first protrusion 1121 may be in contact with the permanent magnet 210 directly or indirectly. Specifically, in some embodiments, the first protrusion 1121 may be configured to contact and abut the permanent magnet 210; in other embodiments, a filler is provided between the first protrusion 1121 and the permanent magnet 210, the first protrusion 1121 may abut against the filler, and the filler may further abut against the permanent magnet 210. For convenience of description, the following description will be given in terms of an embodiment in which the first side 112 of the first lamination 110 is provided with the first protrusion 1121, and the first groove 111 may be provided on a side of the first protrusion 1121 near the rotation axis, and the first protrusion 1121 directly abuts against the permanent magnet 210, and different embodiments may be combined with each other in different technical solutions.

Referring to fig. 3 to 5, the arrangement corresponding to the first projection 1121 described above. The first side edge 112 and the second side edge 113 may be located at both sides of the first laminate 110 in the circumferential direction, respectively. In some embodiments, the first side edge 112 and the second side edge 113 may be used to define adjacent different accommodating spaces 120, respectively. Referring to fig. 4, in some embodiments, the first side 112 (or the second side 113) may be a side on a wall surface on the same side of the first lamination 110, and it is understood that in this embodiment, the first protrusion 1121 is located on a wall surface on the same side of the first lamination 110; in other embodiments, the first side edge 112 or the second side edge 113 may be a side edge on a multi-segment wall of the first laminate 110, and it is understood that in this embodiment, the first protrusion 1121 is located on a side edge formed by the multi-segment wall of the first laminate 110.

In some embodiments, the side of the first lamination 110 remote from the axis of rotation is also connected to the injection molding body 230. Thus, referring to fig. 8, in some embodiments, the side of the first lamination 110 remote from the axis of rotation may have a second slot recessed in a direction toward the axis of rotation. It can be appreciated that in the present embodiment, the second slot body may be disposed in a manner corresponding to that of the first slot body 111, except that the second slot body can be matched with the injection molding body 230 on the side of the rotor core 10 away from the rotation axis to form a clamping structure.

Accordingly, in some embodiments, the end of the first side 112 remote from the axis of rotation may also have a second protrusion. The arrangement of the second protrusions may be referred to as the arrangement of the first protrusions 1121 described above. And in some embodiments, the second groove body may be disposed on a side of the second protrusion away from the rotation axis.

Referring to fig. 3, in some embodiments, the first lamination 110 is symmetrically arranged about the first plane P1, the rotation axis is located in the first plane P1, and the first slot 111 is symmetrically arranged about the first plane P1. It will be appreciated that the first plane P1 extends in a direction parallel to the axis of rotation, and that the first plane P1 is a plane corresponding to the center split line of the first lamination 110. When the first lamination 110 is symmetrically arranged about the first plane P1, or the first slot 111 is symmetrically arranged about the first plane P1, the design and fabrication of the first lamination 110 are facilitated, and the symmetrical design may reduce the corresponding design cost and fabrication cost of the first lamination 110.

Referring to fig. 3, in other embodiments, the structure of each lamination within the first core unit 100 is not exactly the same. Specifically, when the number of laminations of the first core unit 100 is an even number N, at least N/2 of the laminations (including the first laminations 110) have the same shape as the first laminations 110. Illustratively, when the first core unit 100 has twenty laminations, at least ten laminations (including the first lamination 110) have the same structure as the first lamination 110 (the shape of the first lamination 110 may correspond to the lamination shape having the first slot 111). Alternatively, the number of laminations of the first core unit 100 is an odd number M, and at least (M-1) 2/lamination (including the first lamination 110) has the same shape as the first lamination 110. Illustratively, when the first core unit 100 has twenty-one laminations, at least ten laminations (including the first lamination 110) have the same structure as the first lamination 110. It will be appreciated that the above arrangement may provide each lamination within the first core unit 100 with a certain number of slot structures (including the first slot 111), so that the connection tightness between the rotor core 10 and the injection-molded body 230 may be enhanced by the plurality of laminations.

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

In some embodiments, the side of the at least one first lamination 110 facing the axis of rotation and the side facing away from the axis of rotation are each provided with a slot structure. The above arrangement can reduce the lamination structures which are positioned at both ends of the permanent magnet 210 and are asymmetric to each other, thereby increasing the versatility of the lamination, reducing the number of dies of the lamination, and reducing the manufacturing cost of the lamination.

Referring to fig. 3, in some embodiments, the rotor core may have a second plane P2, the second plane P2 being perpendicular to the axis of rotation, the laminations being symmetrically arranged about the second plane P2. In some embodiments, at least one first lamination 110 is on both sides of the second plane P2 in a direction parallel to the axis of rotation. It will be appreciated that the plurality of laminations are symmetrically distributed with respect to the second plane P2 in a direction parallel to the axis of rotation (the second plane P2 may pass through the centrally located laminations when the total number of laminations is odd). It will be appreciated that a plurality of laminations may be distributed on both sides (either uniformly or unevenly) of the second plane P2 in a direction parallel to the axis of rotation, with at least one lamination on each side being the first lamination 110. The above arrangement can enable the first slot 111 to be correspondingly located at two sides of the permanent magnet 210 along the direction parallel to the rotation axis, so that the clamping effect of the first slot 111 is more stable.

Referring to fig. 9 to 10, in some embodiments, laminations having a slot structure recessed in a direction away from the rotational axis may be alternately stacked with other laminations having no slot structure in a direction parallel to the rotational axis, so that the connection tightness between the rotor core 10 and the injection-molded body 230 may be enhanced, and materials may be saved to some extent, reducing the manufacturing cost.

For an arrangement of a plurality of core units. In some embodiments, the core units may each be disconnected from each other. It will be appreciated that the above arrangement may allow a plurality of core units to have no connection structure to each other, so that the magnetic leakage effect may be reduced. In some embodiments, the shape and structure of each core unit may be identical. It will be appreciated that the above arrangement may enable the first core unit 100 and a plurality of core units having the same (or similar) shape and structure as the first core unit 100 to be arranged around the rotation axis of the rotor core 10, and the first core unit 100 has a corresponding protruding limiting structure, so that the plurality of permanent magnets 210 can be conveniently installed in the accommodating space 120 along the circumferential direction of the rotation axis.

Referring to fig. 4, the rotor assembly 300 is manufactured for ease of subsequent fabrication. In some embodiments, the rotor core 10 may include locating holes. The positioning holes may be used to fix the position of the rotor core 10, so that the manufacturing of the rotor assembly 300 may be facilitated. The shape of the positioning hole can be one of a circle, a rectangle, a trapezoid or a polygon. In some embodiments, rotor core 10 may also include injection molded holes. The injection holes may be provided to facilitate injection molding of the rotor core 10, the permanent magnet 210, and the rotation shaft 220 as a single body. The gap between the core units of the rotor core 10 and the gap between the rotor core 10 and the rotating shaft 220 may be filled with the injection-molded body 230.

Referring to fig. 11, the embodiment of the second aspect of the present utility model further provides a rotor assembly 200, where the rotor assembly 200 includes the rotor core 10 of any of the above embodiments, and the rotor assembly 200 further includes a plurality of permanent magnets 210 or a rotating shaft 220 or an injection-molded body 230. A plurality of permanent magnets 210 may be provided in the accommodating space 120, wherein different arrangements may be referred to above. The rotation shaft 220 may be provided at a middle portion of the rotor core 10, and an axis of the rotation shaft 220 may coincide with the rotation axis. The injection body 230 may be coated outside the rotor core 10, and the injection body 230 fills a gap between the rotor core 10 and the rotating shaft 220. The injection body 230 may connect the rotation shaft 220 and the rotor core 10, respectively. For the connection manner of the injection molding body 230, in some embodiments, when the rotor core 10 units are disconnected from each other, the injection molding body 230 may be coated outside the rotor core 10, and the injection molding body 230 may fill a gap between the rotor core 10 and the rotor core 220, so that the injection molding body 230 may connect the rotor core 10 and the rotor core 220, respectively. In some embodiments, the rotation shaft 220 may not be directly connected to each core unit 100, but indirectly connected through the injection body 230.

In the specific processing process of the rotor assembly 200, the relative position between the rotating shaft 220 and the rotor core 10 may be positioned first, and then injection molding is performed outside the combination of the two to form the injection molding body 230, so that the injection molding body 230 wraps the outer wall surface of the rotor core 10, and fills the gap between the rotating shaft 220 and the rotor core 10, thereby achieving the purpose of fixing the rotating shaft 220 and the rotor core 10. Before the injection molding step, the permanent magnet 210 may be installed in the accommodating space 120, so that the rotor assembly 200 may be integrally formed, and the permanent magnet 210 may be installed more stably.

Embodiments of the third aspect of the present utility model provide an electrical machine comprising a rotor assembly 200 and a stator assembly as in any of the embodiments described above.

The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather as utilizing equivalent structural changes made in the description and drawings of the present utility model or directly/indirectly applied to other related technical fields under the application concept of the present utility model.

Claims (10)

1. A rotor core, characterized by comprising a plurality of core units arranged around a rotation axis of the rotor core, wherein an accommodating space is defined between every two adjacent core units, the accommodating space is used for accommodating 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;

the first core unit includes a plurality of laminations arranged in a stacked manner in a direction parallel to the rotational axis, one of the laminations being a first lamination;

the side edge of the first lamination facing the rotation axis is provided with a first groove body recessed in a direction away from the rotation axis.

2. The rotor core as recited in claim 1, wherein,

the first lamination comprises a first side and a second side which are oppositely arranged along the circumferential direction of the rotation axis, the first groove body is defined by a first wall surface, a second wall surface and a third wall surface of the first lamination, which are close to the rotation axis, the first wall surface is connected with the first side, the second wall surface is connected with the second side, and the third wall surface is positioned between the first wall surface and the second wall surface along the circumferential direction of the rotation axis;

the first groove body is defined by one end of the first wall surface, one end of the second wall surface and the third wall surface along the circumferential direction of the rotation axis,

and/or the number of the groups of groups,

the first groove body comprises a first groove part and a second groove part, the first groove part is defined by the first wall surface and one end, close to the first side edge, of the third wall surface along the circumferential direction of the rotation axis, and the second groove part is defined by the second wall surface and one end, close to the second side edge, of the third wall surface.

3. The rotor core as recited in claim 1, wherein,

the first lamination comprises a first side and a second side which are arranged oppositely along the circumferential direction of the rotation axis, one end of the first side, which is close to the rotation axis, is provided with a first bulge, and the first groove body is arranged on the side, which is close to the rotation axis, of the first bulge.

4. The rotor core as recited in claim 1, wherein,

the side edge of the first lamination away from the rotation axis is provided with a second groove body which is recessed towards the direction close to the rotation axis.

5. The rotor core as recited in claim 1, wherein,

the first lamination is symmetrically arranged about a first plane, the axis of rotation is located in the first plane, and the first slot is symmetrically arranged about the first plane.

6. The rotor core as recited in claim 1, wherein,

the lamination shape structures of the first iron core units are the same;

or,

the number of the laminations of the first iron core unit is even number N, and at least N/2 of the laminations have the same shape as the first laminations;

or,

the number of the laminations of the first core unit is an odd number M, and at least (M-1)/2 of the laminations have the same shape as the first laminations.

7. The rotor core as recited in claim 1, wherein,

the rotor core has a second plane perpendicular to the rotation axis, each lamination being symmetrically arranged about the second plane, and at least one of the first laminations being on both sides of the second plane in a direction parallel to the rotation axis.

8. The rotor core as recited in claim 1, wherein,

each iron core unit is disconnected with each other, and the shape and the structure of each iron core unit are the same.

9. A rotor assembly, comprising:

the rotor core of any one of claims 1-8;

the permanent magnets are arranged in the accommodating space.

10. An electric machine, comprising:

the rotor assembly of claim 9; the method comprises the steps of,

a stator assembly.