CN117639316A

CN117639316A - Rotor core, rotor assembly, motor and ventilation equipment

Info

Publication number: CN117639316A
Application number: CN202311670643.2A
Authority: CN
Inventors: 贾武豪; 毛临书; 金奎�; 徐飞; 程云峰
Original assignee: Guangdong Meizhi Compressor Co Ltd; Guangdong Meizhi Precision Manufacturing Co Ltd; Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Meizhi Compressor Co Ltd; Guangdong Meizhi Precision Manufacturing Co Ltd; Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2023-12-06
Filing date: 2023-12-06
Publication date: 2024-03-01

Abstract

The invention provides a rotor core, a rotor assembly, a motor and ventilation equipment, 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 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 with other core units along the circumferential direction around the rotation axis; the first core unit includes M first laminations arranged in a stacked manner in a direction parallel to the rotational axis, each first lamination having a first side edge located at one side in the circumferential direction, not more than N ₁ The end of at least one first side edge, which is far away from the rotation axis, is provided with a first bulge, and the first bulge is suitable for abutting against one end, which is far away from the rotation axis, of the permanent magnet; wherein N is more than or equal to 1 ₁ < M. The inventionThe exposed rotor core can reduce the magnetic leakage effect and the usage amount of rotor core materials and improve the power density of the motor.

Description

Rotor core, rotor assembly, motor and ventilation equipment

Technical Field

The invention relates to the technical field of motors, in particular to a rotor core, a rotor assembly, a motor and ventilation equipment.

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. According to the different positions of the permanent magnets on the rotor, the permanent magnet motor can be divided into three types of surface-mounted type, built-in type and claw pole type. The built-in permanent magnet motor is provided with a tangential type structure and a radial type structure, the radial type structure mainly adopts rare earth permanent magnet materials, the tangential type structure mainly adopts ferrite permanent magnet materials, and permanent magnets are arranged in parallel at a pole pitch to improve the air gap magnetic flux density, so that a higher performance target is achieved by using lower material cost. The tangential structure can realize higher power density and efficiency under unit cost, and is popular with motor manufacturers in the technical field of ventilation equipment motors, particularly air conditioner fans.

Because the built-in tangential motor has relatively larger magnetic leakage, in the related art, the support positions are arranged at four opposite angles of the lamination of each rotor core, and the magnetic leakage can be reduced in the way of breaking the inner magnetic bridge and the outer magnetic bridge, and certain magnetic leakage still exists. On the basis of guaranteeing the structural strength of the rotor, the magnetic leakage of the magnets at the two ends of the outer iron core can be limited by reducing the number of the supporting positions, the utilization rate of the magnets is improved, the power generated by unit current is improved, and the efficiency of the motor is further improved. And the complete removal of the supporting position structure is unfavorable for the installation and fixation of the permanent magnet, and the manufacturability is poor. If the permanent magnet is to be stably positioned, a supporting position structure must be designed, and meanwhile, the circumferential width of the supporting position is too small, so that the equivalent air gap of the motor is enlarged, the magnetic flux density of the air gap is reduced, the efficiency of the permanent magnet motor is reduced, and the existence of the supporting position structure can cause unavoidable magnetic leakage effect. Therefore, the circumferential width of the support bit needs to be considered from the three aspects of magnetic leakage, armature current increase and demagnetizing resistance.

Therefore, how to reduce the magnetic leakage effect of the motor and the usage amount of the rotor core material and improve the motor efficiency on the premise of considering manufacturability and stably positioning the permanent magnet is a technical problem to be solved in the field.

Disclosure of Invention

The invention mainly aims to provide a rotor core, a rotor assembly, a motor and ventilation equipment, which can reduce the magnetic leakage effect of the motor and the use amount of rotor core materials and improve the motor efficiency on the premise of considering manufacturability and stably positioning permanent magnets.

In order to achieve the above purpose, the embodiment of the present invention 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 around the rotational axis;

the first core unit includes M first laminations arranged in a stacked manner in a direction parallel to the rotational axis, each first lamination having a first side edge located at one side in the circumferential direction, not more than N ₁ The end of at least one first side edge, which is far away from the rotation axis, is provided with a first bulge, and the first bulge is suitable for abutting against one end, which is far away from the rotation axis, of the permanent magnet;

Wherein N is more than or equal to 1 ₁ ＜M。

In some embodiments, not more than N ₁ The end part of at least one first side edge, which is close to the rotation axis, is provided with a second bulge, and the second bulge is suitable for abutting against one end, which is close to the rotation axis, of the permanent magnet;

and/or the number of the groups of groups,

each first lamination has a second side edge arranged circumferentially opposite the first side edge, no more than N ₁ The end part of at least one second side edge far away from the rotation axis is provided with a third bulge, and the third bulge is suitable for abutting against one end of the permanent magnet far away from the rotation axis;

and/or the number of the groups of groups,

each first lamination has a second side edge arranged circumferentially opposite the first side edge, no more than N ₁ The end of at least one second side edge, which is close to the rotation axis, is provided with a fourth bulge, and the fourth bulge is suitable for abutting against one end, close to the rotation axis, of the permanent magnet.

In some embodiments, each first lamination has a second side edge disposed circumferentially opposite the first side edge, N ₂ The end of the first side far from the rotation axis is provided with a first bulge, N ₂ The end of the first side close to the rotation axis is provided with a second bulge, N ₂ The end of the second side far from the rotation axis is provided with a third bulge, N ₂ The end that the second side is close to the axis of rotation has the fourth arch, and second arch and fourth arch all are suitable for the one end that the butt permanent magnet is close to the axis of rotation, and the fourth arch is suitable for the one end that the butt permanent magnet kept away from the axis of rotation, and satisfies: n is more than or equal to 1 ₂ ≤N ₁ ＜M。

In some embodiments, each first lamination includes no more than N ₁ The first pair of side laminates at least comprises a first pair of side laminates, the first pair of side laminates are provided with a first bulge at the end of the first side far away from the rotation axis, and the end of the first side close to the rotation axis of the first side is provided with a second bulge, and the second bulge is suitable for abutting against one end of the permanent magnet close to the rotation axis.

In some embodiments, each of the first laminations has a second side circumferentially opposite the first side, each of the first laminations further comprising a second pair of side laminations having a third projection at an end of the second side distal from the axis of rotation, the second pair of side laminations having a fourth projection at an end of the second side proximal to the axis of rotation, the third projection being adapted to abut an end of the permanent magnet distal from the axis of rotation, the fourth projection being adapted to abut an end of the permanent magnet proximal to the axis of rotation, the first pair of side laminations being stacked adjacent to the second pair of side laminations.

In some embodiments, each first laminate has a second side disposed circumferentially opposite the first side, each first laminate comprising no more than N ₁ The third pair of side laminates at least comprises a third pair of side laminates, the end of the third pair of side laminates, which is far away from the rotation axis, is provided with a first bulge, the end of the third pair of side laminates, which is close to the rotation axis, is provided with a fourth bulge, and the fourth bulge is suitable for abutting against one end, which is close to the rotation axis, of the permanent magnet.

In some embodiments, each of the first laminations further includes a fourth pair of side laminations having a second protrusion at an end of the first side adjacent to the axis of rotation and a third protrusion at an end of the second side remote from the axis of rotation, the second protrusion being for abutting an end of the permanent magnet adjacent to the axis of rotation, the third protrusion being for abutting an end of the permanent magnet remote from the axis of rotation, the third pair of side laminations being stacked adjacent to the fourth pair of side laminations.

In some embodiments, the first lamination has a dimension T in a direction parallel to the axis of rotation, the first protrusion is adapted to abut an end of the permanent magnet remote from the axis of rotation in a first direction, and the first protrusion has a largest dimension L in the first direction ₁ And satisfies: l (L) ₁ ≥T；

And/or;

no more than N ₁ The end part, close to the rotation axis, of at least one first side edge is provided with a second bulge, and the second bulge is suitable for abutting against one end, close to the rotation axis, of the permanent magnet along a second direction; the maximum dimension of the second protrusion along the second direction is L ₂ And satisfies: l (L) ₂ ≥T；

And/or;

each first lamination has a second side edge arranged circumferentially opposite the first side edge, no more than N ₁ A second side edge, at least one end of the second side edge away from the rotation axis having a third protrusion adapted to follow a third party Abutting one end of the permanent magnet far away from the rotation axis; the maximum dimension of the third protrusion along the third direction is L ₃ And satisfies: l (L) ₃ ≥T；

And/or;

each first lamination has a second side edge arranged circumferentially opposite the first side edge, no more than N ₁ The end of at least one second side edge, which is close to the rotation axis, is provided with a fourth bulge, and the fourth bulge is suitable for abutting against one end, close to the rotation axis, of the permanent magnet along a fourth direction; the maximum dimension of the fourth protrusion along the fourth direction is L ₄ And satisfies: l (L) ₄ ≥T。

In some embodiments, the first side has an abutment end adapted to abut one side of the first permanent magnet in a circumferential direction such that an interface is defined at an interface of the abutment end and the first permanent magnet;

the maximum value of the end of the first side away from the rotation axis from the interface surface is greater than or equal to the maximum value of the end of the first side close to the rotation axis from the interface surface along the circumferential direction, and/or each first lamination has a second side arranged opposite to the first side along the circumferential direction, and the maximum value of the end of the second side away from the rotation axis from the interface surface is greater than the maximum value of the end of the second side close to the rotation axis from the interface surface along the circumferential direction.

In some embodiments, the first side has an abutment end adapted to abut one side of the first permanent magnet in the circumferential direction such that the interface of the abutment end and the first permanent magnet defines an interface, the distance of the interface from the first protrusion in the fifth direction reaching a maximum value L ₅ The maximum dimension of the first permanent magnet along the fifth direction is L ₆ And satisfies: l (L) ₆ /3≥L ₅ 。

In some embodiments, at most one of the first side edges of each adjacent two of the first laminations has a first projection at an end thereof remote from the axis of rotation 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 invention also provide a rotor assembly including the rotor core of any of the above embodiments; and a plurality of permanent magnets disposed in the accommodation space.

Embodiments of the third aspect of the present invention also provide an electric machine comprising a rotor assembly of any of the embodiments described above; and a stator assembly.

Embodiments of the fourth aspect of the present invention also provide a ventilation device comprising the motor of any of the above embodiments.

Compared with the related art, the invention has the beneficial effects that:

The rotor core of the present invention includes a plurality of core units including a first core unit having a plurality of first laminations arranged in a stacked manner. Each first lamination includes at least two kinds, wherein the first side of one first lamination has a first protrusion at an end away from the rotation axis, and the first side of the other first lamination has no first protrusion at an end away from the rotation axis. Thereby, the first protrusion may abut against an end of the permanent magnet remote from the rotation axis. It will be appreciated that the above arrangement may be such that the first core units are arranged with two first laminations in any form and staggered according to the design requirements of the rotor core. The extended protruding limiting structure has a limiting function, and the extension along the circumferential direction can improve the magnetic flux density of the air gap, but can influence the conduction of the magnetic energy of the rotor core, so that the magnetic leakage phenomenon is caused. Therefore, compared with the design that four opposite angles of the lamination of each rotor core are provided with the protruding limiting structures in the related art, the rotor core is limited in that the end part of at least one first lamination far away from the rotation axis is provided with the first protruding, and the number of the first lamination is smaller than the total number of the first lamination.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained from the structures shown in the drawings without inventive effort to those skilled in the art.

Fig. 1 is a schematic side view of a rotor core provided in a first embodiment of the present invention;

fig. 2 is a perspective view of a rotor core provided in a second embodiment of the present invention;

FIG. 3 is an enlarged partial schematic view of FIG. 2A;

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

FIG. 5 is a schematic side view of a first laminate provided in a third embodiment of the invention;

FIG. 6 is a schematic side view of a first laminate provided in a fourth embodiment of the invention;

FIG. 7 is a schematic side view of a first pair of side laminates provided in a fifth embodiment of the invention;

FIG. 8 is a schematic side view of a second pair of side laminates provided in a fifth embodiment of the invention;

FIG. 9 is a schematic side view of a third pair of side laminates provided in a sixth embodiment of the invention;

FIG. 10 is a schematic side view of a fourth pair of side laminates provided in a sixth embodiment of the invention;

FIG. 11 is a schematic side view of a first pair of side laminations in combination with a first permanent magnet provided in a fifth embodiment of the present invention;

FIG. 12 is a schematic side view of a second pair of side laminations in combination with a permanent magnet provided in a fifth embodiment of the present invention;

fig. 13 is a schematic side view of a rotor core provided in a fifth embodiment of the present invention;

fig. 14 is a schematic side view of a rotor core provided in a fifth embodiment of the present invention;

FIG. 15 is an enlarged partial schematic view at B in FIG. 14;

fig. 16 is a schematic side view of a rotor core provided in a sixth embodiment of the present invention;

FIG. 17 is an enlarged partial schematic view of FIG. 16C;

FIG. 18 is a schematic side view of a rotor assembly provided by an embodiment of a second aspect of the present invention;

fig. 19 is a schematic side view of a rotor assembly and stator assembly according to an embodiment of the second aspect of the present invention.

Reference numerals illustrate:

1-a rotor core;

100-core units;

10-a first core unit; 11-a first lamination; 111-a first side; 1111-a first bump; 1112-

A second protrusion; 1113-injection molding a stretch hole; 1114—abutment end; 112-a second side; 1121-third protrusions; 1122-fourth projections; 113-a first pair of side laminations; 114-a second pair of side laminates; 115-third pair of side laminates; 116-fourth pair of side laminates; 117-staking holes; 118-test wells; 119-injection molding holes; 120-an inner core; 121-shaft holes; 122-tooth grooves;

20-permanent magnets; 21-a first permanent magnet;

30-accommodating space;

40-a rotor assembly;

a 50-stator assembly; 51-yoke; 511-a first inner wall surface; 512-a second inner wall surface; 52-tooth; 521-winding grooves; 53-bootie; 54-peripheral grooves;

60-injection molding;

70-air gap;

a K-axis of rotation;

a P-interface;

X ₁ -a first direction;

Y ₁ -a second direction;

X ₂ -a third direction;

Y ₂ -a fourth direction;

z-a fifth direction;

w-circumferential direction.

The achievement of the objects, functional features and advantages of the present invention 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 invention 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 invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

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 invention, 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 invention, 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 of" and/or B "includes three parallel schemes, for example, including scheme, or scheme B satisfying both. 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 invention.

Because the built-in tangential motor has relatively larger magnetic leakage, in the related art, the support positions are arranged at four opposite angles of the lamination of each rotor core, and the magnetic leakage can be reduced in the way of breaking the inner magnetic bridge and the outer magnetic bridge, and certain magnetic leakage still exists. On the basis of guaranteeing the structural strength of the rotor, the magnetic leakage of the magnets at the two ends of the outer iron core can be limited by reducing the number of the supporting positions, the utilization rate of the magnets is improved, the power generated by unit current is improved, and the efficiency of the motor is further improved. And the complete removal of the supporting position structure is unfavorable for the installation and fixation of the permanent magnet, and the manufacturability is poor. Specifically, the permanent magnet and the iron core units can be wrapped by the injection molding body to realize circumferential and axial positioning, and in the rotating process of the rotor, the permanent magnet arranged between the iron core units is very easy to loose under the action of centrifugal force, and even is directly separated from and thrown out from the iron core units, so that the injection molding body is broken, and the motor is broken. From the above analysis, if the permanent magnet is to be stably positioned, the supporting structure must be designed, and the circumferential width of the supporting structure is too small, which results in the increase of the equivalent air gap of the motor, and further, the magnetic flux density of the air gap is reduced, the efficiency of the motor is reduced, and the existence of the supporting structure causes unavoidable magnetic leakage effect. Therefore, the circumferential width of the support bit needs to be considered from the three aspects of magnetic leakage, armature current increase and demagnetizing resistance.

In view of this, referring to fig. 1 to 19, in an embodiment of the present invention, there is provided a rotor core 1, the rotor core 1 including a plurality of core units 100 arranged around a rotation axis K of the rotor core 1, each adjacent two core units 100 defining a receiving space 30 therebetween, the receiving space 30 being for receiving a permanent magnet 20, one of the core units 100 being a first core unit 10, the first core unit 10 being disconnected from the other core units 100 in a circumferential direction W around the rotation axis K. It will be appreciated that in some embodiments, a plurality of core units 100 may be arranged circumferentially about the rotation axis K to constitute a plurality of units of the rotor core 1. In some embodiments, each core unit 100 may have a fan shape as viewed in a direction parallel to the rotation axis K, so that each core unit 100 arranged around may have an annular shape as a whole of the rotor core 1. The core units 100 may be arranged at equal intervals or irregularly along the circumferential direction W of the rotation axis K. 1-2, in this class of embodiments, the rotor core 1 has ten core units 100.

An accommodating space 30 is defined between each adjacent two of the core units 100, and the accommodating space 30 is used for accommodating the permanent magnets 20. It will be appreciated that there is a space between two adjacent core units 100 capable of accommodating the permanent magnet 20. For example, referring to fig. 1-2, in this class of embodiments, ten core units 100 may collectively define ten accommodation spaces 30, so that a rotor assembly 40 having the rotor core 1 may correspondingly provide ten permanent magnets 20, and the ten permanent magnets 20 are disposed in the ten accommodation spaces 30 in a one-to-one correspondence. In another embodiment, there may be a space between the permanent magnets 20 and the core unit 100, and other materials may be filled between the two, so that the relative position between the permanent magnets 20 is fixed, or the relative position between the permanent magnets 20 and the core unit 100 is fixed. In yet another embodiment, a plurality of permanent magnets 20 may be correspondingly disposed in a single accommodation space 30. For example, referring to fig. 1-2, the maximum dimension of the permanent magnet 20 along the rotor assembly 40 in a radial direction perpendicular to the rotational axis K may correspond to the maximum dimension of the receiving space 30. According to the above arrangement, the accommodation space 30 may be defined by two wall surfaces opposing each other in the circumferential direction W between the adjacent two core units 100.

Referring to fig. 1-2, one of the core units 100 is a first core unit 10. The first core unit 10 is disconnected from the other core units 100 in the circumferential direction W around the rotation axis K. Thus, in some embodiments, the core units 100 of the rotor core 1 other than the first core unit may be connected to each other to improve the integrity of the rotor core 1, and may be disconnected from each other to avoid magnetic leakage at the connection. 1-2, in this class of embodiments, each core unit 100 is disposed apart from each other.

In some embodiments, the rotor core 1 is not assembled into the rotor assembly 40, and is in a state before injection molding. Therefore, the state in which the first core unit 10 is disconnected from the other core units 100 may be understood as a state in which the first core unit 10 is spaced apart from the other core units 100 during the manufacturing process, and the rotor core 1 may be coupled as a whole by an injection molding process in a later step.

Referring to fig. 3 to 4, the first core unit 10 includes M first laminations 11 arranged in a stacked manner in a direction parallel to the rotational axis K. In some embodiments, M may be the total number of laminations contained by the first core unit 10; in other embodiments, M may be the number of partial laminations in the first core unit 10, that is, the first core unit 10 in this embodiment may include more than M laminations, including M first laminations 11 and other laminations. For convenience of description, the following description will use an embodiment in which M is the total number of laminations included in the first core unit 10 as an illustration, and different embodiments may be combined with each other between different technical solutions.

Referring to fig. 3-4, each first lamination 11 has a first side 111 on one side in the circumferential direction W, not more than N ₁ The first sides 111 and the end of at least one first side 111 remote from the axis of rotation K have a first projection 1111. Wherein N is more than or equal to 1 ₁ < M. That is, each first lamination 11 may have a first side 111 and a second side 112 located opposite to each other in the circumferential direction W, and both sides may be adapted to face one side of its corresponding permanent magnet 20, respectively. It will be appreciated that each first laminate 11 comprises at least two types, one of the first laminate 11The end of the first side 111 remote from the axis of rotation K has a first projection 1111; the end of the first side 111 of the other first lamination 11 facing away from the axis of rotation K does not have a first projection 1111. The above N ₁ Represented as the maximum number of first sides 111 having first protrusions 1111. In different embodiments, the first side 111 of the single first lamination 11 may have only one first protrusion 1111 or may have a plurality of first protrusions 1111, and for convenience of description, the following embodiment in which the end of the first side 111 of the single lamination away from the rotation axis K has only one first protrusion 1111 is taken as an illustration, and different embodiments may be combined with each other between different technical solutions. Exemplary, in some embodiments, the number N of first sides 111 of the first core unit 10 having the first protrusion 1111 at the end far from the rotation axis K is provided with the condition that M is 5 ₁ May be one of 1, 2, 3, 4, and when N ₁ When 1, the number of first sides 111 of the first core unit 10, which do not have the first projections 1111 at the end portion away from the rotation axis K, is 4; in other embodiments, provided that M is 3, the end of the first core unit 10 remote from the axis of rotation K has the number N of first sides 111 of the first protrusion 1111 ₁ May be one of 1 and 2, and when N ₁ At 2, the number of first sides 111 of the first core unit 10, which do not have the first projections 1111 at the end portion away from the rotation axis K, is 1. The above-described arrangement of the first projections 1111 may be such that the first core unit 10 includes two kinds of first laminations 11 simultaneously, that is, the first lamination 11 having the first projections 1111 at the end of the first side 111 remote from the rotation axis K and the first lamination 11 having no first projections 1111 at the end of the first side 111 remote from the rotation axis K, among the plurality of laminations stacked in the direction parallel to the rotation axis K.

It should be noted that, in the present embodiment, the circumferential direction W is denoted as a single direction around the rotation axis K, which may correspond to a clockwise direction or a counterclockwise direction, referring to fig. 1 to fig. 4, and for convenience of description, embodiments in which the circumferential direction W is denoted as the circumferential direction W are described below, and different embodiments may be combined with each other, for example, in other embodiments, the circumferential direction W may also correspond to a clockwise direction, so that, in the present embodiment, the positions of the first side edge 111 and the second side edge 112 shown in fig. 1 to fig. 4 may be interchanged. Furthermore, the definition of the first projection 1111 above indicates that the first projection 1111 is only located at the end of the first side 111 away from the rotation axis K, and the other positions do not have the first projection 1111, and the same applies to other projection structures related to the present invention.

Referring to fig. 1-4, the first projection 1111 is adapted to abut an end of the permanent magnet 20 remote from the rotation axis K. The abutment for the first projection 1111. It will be appreciated that the first side 111 has one end close to the rotation axis K and another end far from the rotation axis K, and the two ends may be located on the same side wall or on different walls respectively, and may represent a wall portion facing the stator assembly 50/the rotation shaft in a radial direction perpendicular to the rotation axis K, or may represent a wall portion of the permanent magnet 20 in the circumferential direction W. The first projection 1111 is adapted to abut an end of the permanent magnet 20 remote from the rotation axis K. It can be appreciated that the first protrusion 1111 can improve the installation stability of the permanent magnet 20 by limiting the radial displacement of the permanent magnet 20 along the perpendicular to the rotation axis K, so that the limit capability of the rotor core 1 to the permanent magnet 20 is greatly enhanced during the operation of the motor, on one hand, the fracture risk of the injection molding material is greatly reduced, and on the other hand, the detachment risk of the permanent magnet 20 and the rotor core 1 is also greatly reduced. According to the technical scheme, on the premise of ensuring the power density of the motor, the limit capability of the rotor core 1 to the permanent magnet 20 is greatly improved, the stability of connection between the permanent magnet 20 and the rotor core 1 is improved, in addition, the first protrusions 1111 can facilitate positioning and mounting of the permanent magnet 20 on the rotor core 1, and the manufacturability of the rotor assembly 40 is improved.

For the structure of the first projection 1111. The first projection 1111 may extend in a circumferential direction W around the rotation axis K to be adapted to abut against the permanent magnet 20. The first protrusion 1111 may have an abutment end 1114 surface facing the permanent magnet 20 and adapted to abut the permanent magnet 20, and the abutment end 1114 surface may be planar or curved. Note that, the first protrusion 1111 may abut against the permanent magnet 20 directly or indirectly. Specifically, in some embodiments, the first protrusion 1111 may be configured to directly contact and abut against the permanent magnet 20; in other embodiments, a filler is disposed between the first protrusion 1111 and the permanent magnet 20, the first protrusion 1111 may abut against the filler, and the filler may further abut against the permanent magnet 20, such that the first protrusion 1111 indirectly abuts against the permanent magnet 20. For convenience of description, the following description will be given taking an embodiment in which the first protrusion 1111 is adapted to directly abut against the permanent magnet 20 as an illustration, and different embodiments may be combined with each other between different technical solutions.

Referring to fig. 4-5, in some embodiments, the first side 111 may be a side on the same side wall of the first laminate 11; referring to fig. 6, in other embodiments, the first side 111 may be a side formed by a combination of wall surfaces of the first lamination 11 facing in different directions.

In some embodiments, the rotor core 1 may also have a functional opening, in particular, see fig. 2, for example, the first core unit 10, in which case the first core unit 10 may each have a plurality of openings extending in a direction parallel to the axis of rotation K and penetrating at least one first lamination 11, wherein, seen in a direction parallel to the axis of rotation K, a rectangular opening may be provided for extending into the connection for securing the end plate, in particular, the opening may be a rivet hole 117 for extending axially into the rivet, and furthermore, the opening may be provided for positioning an adjacent first lamination 11, in particular, in some embodiments, the first lamination 11 may be stamped on an end face perpendicular to the axis of rotation K during machining such that the end face forms a recess, while the side of the first lamination 11 facing away from the end face may form a positioning protrusion, in which way each first lamination 11 may be manufactured, whereby, after lamination, the positioning protrusion of the first lamination 11 may be provided through the recess of the adjacent first lamination 11 to enhance the stability of the connection between the first laminations 11. Alternatively, an aperture formed by a combination of a circular cross-section and a rectangular cross-section may be used to extend into the outer connector, for example, the aperture may be a test aperture 118 for connection to a test end of the rotor dynamic balance correction device. In addition, the approximately circular hole may be an injection hole 119, and the injection hole 119 may extend in a direction parallel to the rotation axis K, whereby the injection body 60 may pass through the injection hole 119 during injection molding to connect both ends of the rotor body in the axial direction. To facilitate filling of the injection molding material, the injection molding hole 119 may be a circular cross-sectional hole or a shaped hole having a circular arc in cross-section; in addition, the rectangular notch hole located on the side of the core unit 100, that is, the first side 111 and the second side 112 opposite thereto, may be an injection molding stretching hole 1113, where the injection molding stretching hole 1113 may be used for injecting injection molding material when the rotor core 1 is filled and molded, so that the injection molding body 60 can realize the clamping and limiting function through the opening after molding, and further improves the stability of connecting the injection molding body 60 to the rotor core 1.

According to the combination of the above embodiments, it can be seen that the rotor core 1 of the present invention comprises a plurality of core units 100 including a first core unit 10, the first core unit 10 having a plurality of first laminations 11 arranged in a stacked manner. Each first lamination 11 comprises at least two types, wherein the end of the first side 111 of one first lamination 11 far from the rotation axis K is provided with a first protrusion 1111, and the end of the first side 111 of the other first lamination 11 far from the rotation axis K is not provided with the first protrusion 1111. Thereby, the first protrusion 1111 may abut against an end of the permanent magnet 20 remote from the rotation axis K. It will be appreciated that the above arrangement allows the first core unit 10 to be provided with two first laminations 11 in any desired manner, depending on the design requirements of the rotor core 1. The extended protruding limiting structure has a limiting function, and the extension along the circumferential direction W can improve the magnetic flux density of the air gap 70, but can influence the conduction of the magnetic energy of the rotor core 1, so that the magnetic leakage phenomenon is caused. Therefore, compared with the design that the four opposite angles of the lamination of each rotor core 1 have the protrusion limiting structure in the related art, the invention limits that the end of at least one first lamination 11 far away from the rotation axis K has the first protrusion 1111, and the number of the first lamination 11 is smaller than the total number of the first lamination 11, so that the rotor core 1 of the invention can reduce the magnetic leakage effect and the usage amount of the rotor core 1 material and improve the power density of the motor while considering manufacturability and stably positioning the permanent magnet 20 through various side structure designs.

In order to further limit the displacement of the permanent magnet 20 and improve the mounting stability of the permanent magnet 20, more protruding structures may be provided in the first lamination 11. In one aspect, referring to FIG. 7, in some embodiments, no more than N ₁ The first sides 111 and the end of at least one of the first sides 111 near the axis of rotation K has a second protrusion 1112, the second protrusion 1112 being adapted to abut against an end of the permanent magnet 20 near the axis of rotation K. It will be appreciated that the second protrusions 1112 may be adapted to limit displacement of the permanent magnet 20 beside the first side 111 in a direction approaching the rotation axis K.

On the other hand, referring to fig. 8, each first lamination 11 has a second side 112 arranged opposite to the first side 111 in the circumferential direction W, not more than N ₁ The second sides 112, and the end of at least one of the second sides 112 remote from the rotation axis K has a third protrusion 1121, the third protrusion 1121 being adapted to abut against an end of the permanent magnet 20 remote from the rotation axis K. It will be appreciated that the third projection 1121 may be adapted to limit displacement of the permanent magnet 20 beside the second side 112 in a direction away from the rotational axis K.

On the other hand, referring to fig. 8, each first lamination 11 has a second side 112 disposed opposite the first side 111 in the circumferential direction W, not more than N ₁ The second sides 112, and at least one end of the second sides 112 near the rotation axis K has a fourth protrusion 1122, and the fourth protrusion 1122 is adapted to abut against an end of the permanent magnet 20 near the rotation axis K. It will be appreciated that the second protrusions 1112 may be adapted to limit displacement of the permanent magnet 20 beside the second side 112 in a direction away from the rotational axis K.

With respect to the definition of the second protrusions 1112, the third protrusions 1121, and the fourth protrusions 1122 of the above-described embodiments, it is understood that the second protrusions 1112, the third protrusions 1121, and the fourth protrusions 1122 may each be adapted to abut the permanent magnet 20, similar to the arrangement of the first protrusions 1111, except that different protrusion structures are arranged at different locations, and may be adapted to abut different sides of the permanent magnet 20. Further, regarding the arrangement of the first core unit 10, each of the first laminations 11 may be arranged to have at most one protrusion structure, respectively, in some embodiments (the protrusion structures in the embodiments of the present invention are all generically indicated as the first protrusion 1111, the second protrusion 1112, the third protrusion 1121, and the fourth protrusion 1122), and the first laminations 11 having different protrusion structures may be arranged in any combination; referring to fig. 5, in other embodiments, there may be a portion (or all) of the first laminate 11 having multiple raised structures at the same time to provide a more stable abutment.

For the above-described embodiment including the second protrusions 1112, in some embodiments, the accommodation space 30 may be defined by two wall surfaces opposing in the circumferential direction W between the adjacent two core units 100, and the first protrusions 1111 and the second protrusions 1112 opposing in the radial direction perpendicular to the rotation axis K. In order to enable the provision of the protrusions to facilitate the installation of the permanent magnet 20, and to have a good limit function. In some embodiments, a minimum distance between the first protrusions 1111 and the second protrusions 1112 in a radial direction perpendicular to the rotation axis K may correspond to a length of the permanent magnet 20 in the radial direction perpendicular to the rotation axis K, so that the permanent magnet 20 may be easily placed in the receiving space 30. Similarly, in some embodiments, the accommodating space 30 may be further defined by two wall surfaces opposing each other in the circumferential direction W between the adjacent two core units 100, and the third projection 1121 and the fourth projection 1122 opposing each other in the radial direction perpendicular to the rotation axis K.

In order to improve the degree of standardization of the manufacture of the rotor core 1 while stably positioning the permanent magnets 20 in all directions, based on the definition of the second side 112 in the above embodiment, see fig. 2, in some embodiments, there may be N ₂ The end of the first side 111 remote from the axis of rotation K has a first projection 1111, and may have N ₂ The end of the first side 111 near the rotation axis K is provided with a second protrusion 1112, and N ₂ The end of the second side 112 remote from the rotation axis K is provided with a third protrusion 1121, and N ₂ The end of each second side 112 near the rotation axis K has a fourth projection 1122. As with the previous embodiments, the second protrusions 1112 and the fourth protrusions 1122 may each be adapted to abut the permanent magnetThe body 20 near an end of the rotation axis K, the fourth projection 1122 may be adapted to abut an end of the permanent magnet 20 remote from the rotation axis K. N is as described above ₂ The method meets the following conditions: n is more than or equal to 1 ₂ ≤N ₁ < M. It is understood that the number of the first protrusions 1111, the second protrusions 1112, the third protrusions 1121, and the fourth protrusions 1122 in the first core unit 10 may be N ₂ And N ₂ A maximum value N less than or equal to the number of first projections 1111 ₁ . The above number arrangement can make the abutment limiting effect of each first lamination 11 in the first core unit 10 formed in each direction relatively balanced, thereby further improving the mounting stability of the permanent magnet 20. Exemplary, in some embodiments, when M is 2, the first core unit 10 includes 2 first laminations 11, where N ₂ Can take a value of 1; when M is 2, the first core unit 10 includes 3 first laminations 11, where N ₂ The value may be 1 or 2.

An embodiment in which the first laminate 11 has a plurality of projection structures at the same time will be described. Referring to fig. 7, in some embodiments, each first lamination 11 may include no more than N ₁ A first pair of side laminates and at least one first pair of side laminates 113. The first pair of side laminations 113 has a first projection 1111 at an end of the first side 111 remote from the axis of rotation K, and the first pair of side laminations 113 has a second projection 1112 at an end of the first side 111 proximate to the axis of rotation K. As in the case of the previous embodiment, the second protrusions 1112 are adapted to abut against the end of the permanent magnet 20 adjacent to the axis of rotation K. It will be appreciated that, among the first laminates 11 having the first protrusions 1111, all or part of the first laminates 11 may further have the second protrusions 1112, and the first protrusions 1111 and the second protrusions 1112 are located on the same side thereof in the circumferential direction W, so that the first laminates 11 of this type can simultaneously have different abutment effects through a plurality of protrusion structures and are advantageous in improving the abutment stability of the first laminates 11.

Based on the definition of the first pair of side laminations 113 and the second side 112 of the above embodiment, in order to further improve the abutment stability of the first lamination 11 and reduce the magnetic leakage effect. Referring to fig. 8, in some embodiments, each first lamination 11 may also include a second pair of side laminations 114. The second pair of side laminations 114 can have a third projection 1121 at the end of the second side 112 remote from the axis of rotation K. In addition, the second pair of side laminations 114 can have a fourth projection 1122 at the end of the second side 112 near the rotational axis K. As with the above described embodiments, the third projection 1121 may be adapted to abut an end of the permanent magnet 20 remote from the rotational axis K, and the fourth projection 1122 may be adapted to abut an end of the permanent magnet 20 proximate to the rotational axis K. It is understood that third protrusions 1121 and fourth protrusions 1122 of second pair of side laminates 114 may be disposed in a substantially symmetrical relationship with first protrusions 1111 and second protrusions 1112 of first pair of side laminates 113. Further, referring to fig. 7-8, in some embodiments, the first protrusions 1111 and the third protrusions 1121 opposite thereto may be disposed in a mirror image relationship, or the second protrusions 1112 and the fourth protrusions 1122 opposite thereto may be disposed in a mirror image relationship, which may make the abutting actions of the two types of first laminates 11 in different directions more uniform, and the manufacturing standardization of the first laminates 11 is higher; in other embodiments, the above-mentioned protruding structures may not be disposed in a mirror image relationship, so that the relative positional relationship between the protruding structures may be adjusted according to the positioning requirement. Thus, the first pair of side laminates 113 and the second pair of side laminates 114 may be arranged in adjacent stacks. It will be appreciated that the above arrangement allows the adjacent stacked first laminations 11 to have staggered protrusion structures, thereby ensuring stable positioning while reducing protrusion structures, i.e. reducing manufacturing materials and magnetic leakage effects. With the arrangement of the above embodiments, the first pair of side laminates 113 and the second pair of side laminates 114 are stacked adjacent to each other, so that both laminates can jointly function as abutment against each direction, and the relative positional relationship of the protrusions can be adjusted according to positioning requirements.

On the other hand, similar to the first pair of side laminates 113 described above, each first laminate 11 may include no more than N in some embodiments, see FIG. 9, based on the definition of the first pair of side laminates 113 and second side 112 of the embodiments described above ₁ A third pair of side laminates 115 and including at least a third pair ofSide laminate 115. The third pair of side laminates 115 may have a first protrusion 1111 at the end of the first side 111 remote from the rotation axis K. In addition, the third pair of side laminations 115 has a fourth projection 1122 at the end of the second side 112 near the rotational axis K. As in the case of the previous embodiment, the fourth projection 1122 is adapted to abut an end of the permanent magnet 20 adjacent the axis of rotation K. It will be appreciated that, among the first laminates 11 having the first protrusions 1111, all or part of the first laminates 11 may further have fourth protrusions 1122, and the first protrusions 1111 and the fourth protrusions 1122 are located at opposite sides of the first laminates 11 in the circumferential direction W, so that the first laminates 11 of this type can simultaneously perform different abutting actions through a plurality of protrusion structures, and are advantageous in improving the abutting stability of the first laminates 11.

In order to further increase the abutment stability of the first lamination 11 and reduce the magnetic leakage effect. Similar to the second pair of side laminates 114 of the previous embodiments, referring to fig. 10, in some embodiments each first laminate 11 may also include a fourth pair of side laminates 116. The fourth pair of side laminations 116 can have a second protrusion 1112 at the end of the first side 111 near the axis of rotation K. In addition, the fourth pair of side laminations 116 can have a third projection 1121 at the end of the second side 112 remote from the axis of rotation K. As with the above described embodiments, the second protrusions 1112 are adapted to abut against the end of the permanent magnet 20 near the rotation axis K, and the third protrusions 1121 are adapted to abut against the end of the permanent magnet 20 remote from the rotation axis K. The relative positions of the first protrusion 1111, the second protrusion 1112, the third protrusion 1121 and the fourth protrusion 1122 in the present embodiment may be referred to the above description about the first pair of side laminations 113 and the second pair of side laminations 114 from the perspective of the first core unit 10 as a whole, and will not be described herein, but the arrangement of the third pair of side laminations 115 and the fourth pair of side laminations 116 in the present embodiment is different in that the respective two protrusion structures of the two types of laminations are located opposite to each other in the circumferential direction W. Thus, similar to the first pair of side laminates 113 and the second pair of side laminates 114 of the above-described embodiments, the third pair of side laminates 115 and the fourth pair of side laminates 116 may be adjacently stacked. Further, in some embodiments, the first pair of side laminations 113, the second pair of side laminations 114, the third pair of side laminations 115, and the fourth pair of side laminations 116 may be stacked in any manner in the first core unit 10, as desired.

In order to achieve a good abutment positioning of the protruding structures, the dimensional selection of the first lamination 11 is described below. Referring to fig. 2, in some embodiments, the dimension T of each first lamination 11 along a direction parallel to the axis of rotation K is defined. It will be appreciated that T is the thickness dimension of each first lamination 11 in a direction parallel to the axis of rotation K, in actual measurement the dimensions of the first laminations 11 can be measured by means of a vernier caliper. When the dimensions of the individual first laminations 11 are not uniform or the dimensions between the individual first laminations 11 are not uniform, the largest dimension of each first lamination 11 in the direction parallel to the axis of rotation K is taken as T, i.e. the dimension of the position where the first lamination 11 is largest in size can be taken as the largest dimension T. Referring to fig. 11, the first protrusion 1111 is adapted to be along the first direction X ₁ Abutting against the end of the permanent magnet 20 remote from the axis of rotation K. It will be appreciated that the first direction X ₁ Corresponds to the direction of the abutment force corresponding to the contact surface of the first projection 1111 with the permanent magnet 20, and is defined as follows: when the contact surface is regular, the first direction X ₁ The direction of the abutting force of the contact surface of the first protrusion 1111 and the permanent magnet 20 to the permanent magnet 20; when the contact surface is irregular, three quartering points (namely, three points capable of dividing the contact surface into four parts along the circumferential direction W) of the contact surface are selected from the contact surface along the circumferential direction W, and the superposition direction (equivalent vector) of the abutment forces corresponding to the three points is taken as the first direction X ₁ 。

For the measuring method of various sizes in the invention, any suitable optical measuring instrument can be adopted for measuring various sizes in some measurement, and the optical measuring instrument can not only analyze and process a plurality of measurement data of precise sizes, angles and the like, but also rapidly and accurately acquire the surface morphology information of the three-dimensional object. Specifically, the optical measuring instrument can capture image data through a camera equipped in the optical measuring instrument, a software system synthesizes the acquired image data into an intuitive image, and finally, the measuring size can be obtained through data analysis of the image.

Based on the above definition, referring to FIG. 11, in some embodiments, a first protrusion 1111 is defined along a first direction X ₁ Is L in maximum dimension ₁ And can satisfy: l (L) ₁ And (5) not less than T. It can be appreciated that L of the first projection 1111 ₁ The size satisfies L ₁ And the bearing is more stable in abutting and positioning effect due to the fact that T is not less than or equal to T.

During processing, the integrally formed first laminate 11 and each of the projection structures may be obtained by punching, so that the L of the first projection 1111 after punching ₁ The size satisfies L ₁ Not less than T, and can be convenient for stamping and forming, and the stamping and forming quality is improved.

Further, similar to first protrusion 1111, referring to fig. 11-12, in some embodiments, based on the definition of second protrusion 1112, third protrusion 1121, and fourth protrusion 1122 in the above embodiments, in some embodiments, second protrusion 1112 is defined along second direction Y ₁ Is L in maximum dimension ₂ Third protrusion 1121 along third direction X ₂ Is L in maximum dimension ₃ Fourth bump 1122 in fourth direction Y ₂ Is L in maximum dimension ₄ And can satisfy: l (L) ₂ T or L ₃ T or L ₄ And (5) not less than T. Wherein the second protrusions 1112 are adapted to be along the second direction Y ₁ The third protrusion 1121 is adapted to abut against an end of the permanent magnet 20 near the rotation axis K in a third direction X ₂ The fourth projection 1122 is adapted to abut against an end of the permanent magnet 20 remote from the rotational axis K in a fourth direction Y ₂ Abutting against one end of the permanent magnet 20 close to the rotation axis K, and for the second direction Y ₁ Third direction X ₂ Fourth direction Y ₂ Is defined as in the first direction X ₁ Is defined in (a). Similar to the first protrusion 1111, it is understood that the above-described for L is satisfied ₂ 、L ₃ 、L ₄ The size of the bearing can be limited to ensure that the bearing has a stable abutting and positioning effect. The above L ₁ 、L ₂ 、L ₃ 、L ₄ Reference may be made to the above-described measurement method of the maximum dimension T of each first lamination 11 in a direction parallel to the axis of rotation K,and will not be described in detail herein.

Referring to fig. 11, in some embodiments, the first side 111 may have an abutment end 1114, and the abutment end 1114 may be adapted to abut one side of the first permanent magnet 21 in the circumferential direction W such that the interface of the abutment end 1114 and the first permanent magnet 21 defines an interface P. It will be appreciated that the abutment end 1114 is a portion of the first side 111 for abutting against the positioning permanent magnet 20, and the abutment surface of the abutment end 1114 and the first permanent magnet 21 may be a plane or a curved surface, because the abutment surface is the above-mentioned interface P when the first side 111 is applied to abutting against and positioning the first permanent magnet 21 (i.e., the permanent magnet 20 to which the rotor core 1 is mounted includes at least the first permanent magnet 21).

Based on the above definition, in one aspect, referring to fig. 11, in some embodiments, the maximum value of the end of the first side 111 away from the rotation axis K from the interface P may be greater than the maximum value of the end of the first side 111 near the rotation axis K from the interface P in the circumferential direction W. On the other hand, in some embodiments, based on the definition of the second side 112 in the above embodiments, in the reverse direction of the circumferential direction W, the maximum value of the end of the second side 112 away from the rotation axis K from the interface P may be greater than or equal to the maximum value of the end of the second side 112 close to the rotation axis K from the interface P. It will be appreciated that the distance between the two above-mentioned aspects indicates the extension distance of the protruding structure located at the first side 111 or the second side 112 with respect to the interface P, that is, the extension distance of the protruding structure at the end portion far from the rotation axis K is greater than or equal to the extension distance of the protruding structure at the end portion close to the rotation axis K for the first side 111/the second side 112, thereby ensuring that the protruding structure has a better restriction effect on the displacement of the permanent magnet 20 in the direction far from the rotation axis K, which is advantageous for improving the stability of the installation of the permanent magnet 20.

In the above-mentioned extending distance of the protrusion structure of the first side 111 or the second side 112 relative to the interface P, in actual measurement, taking the example of comparing the first protrusion 1111 and the second protrusion 1112, one end of the vernier caliper may be abutted against the interface P, the other end may be abutted against the end of the first protrusion 1111 away from the first side 111, further the linear extending distance of the first protrusion 1111 may be measured, and similarly the linear extending distance of the second protrusion 1112 may be measured, and by comparing the above-mentioned two linear extending distances, the magnitude relation of the extending distances of the first protrusion 1111 and the second protrusion 1112 relative to the interface P along the circumferential direction W may be indirectly obtained.

The definition of the interface P is based on the above embodiment. Referring to FIG. 11, in some embodiments, in the fifth direction Z, the distance of the interface P from the first projection 1111 reaches a maximum value L ₅ . It can be understood that the fifth direction Z corresponds to the direction of the line connecting the interface P to the maximum distance between the first protrusions 1111. Based on this, the maximum dimension of the first permanent magnet 21 in the fifth direction Z is defined as L ₆ And can satisfy: l (L) ₆ /3≥L ₅ . Exemplary, when L ₆ At 3mm, L ₅ Can take a value of 1mm; when L ₆ At 6mm, L ₅ The value can be 1mm or 2mm. It will be appreciated that since the protrusion structure of the first protrusion 1111 causes the magnetic leakage phenomenon, and the longer the extension length, the more serious the magnetic leakage, it is necessary to define the extension length, L, of the first protrusion 1111 ₆ And/3 is the maximum value of the extension length of the first protrusion 1111 along the fifth direction Z relative to the interface P. It should be noted that the size limitation of the first protrusion 1111 in the above embodiment may be combined with the limitation of other protrusion structures, which will not be described herein.

In addition, the extension of the first protrusions 1111 may also affect the size of the air gap 70 formed between the rotor assembly 40 and the stator assembly 50. In some embodiments, the stator assembly 50 may be disposed around the rotor core 1, and an air gap 70 is formed between the rotor core 1 and the stator assembly 50, where the first protrusion 1111 is configured to block air magnetic resistance, that is, the longer the extension length of the first protrusion 1111, the smaller the opening size of the corresponding accommodating space 30 of the first protrusion 1111, the smaller the air magnetic resistance at the opening, and the reduced the equivalent air gap 70, which is beneficial to the flow of the magnetic field, but the longer the extension length may cause the magnetic leakage phenomenon. That is, the magnetic resistance at the position of the first protrusion 1111 is smaller than that of the air at the opening of the accommodating space 30, and the magnetic circuit generated by the permanent magnet 20 is preferentially distributed at the position where the magnetic resistance is smaller, so that the above arrangement can pass the direction in which the magnetic circuit preferentially extends from the first protrusion 1111.

To further reduce the magnetic leakage effect of the rotor core 1, in some embodiments, the total number of first laminations 11 in the first core unit 10 is M, wherein the ends of the first sides 111 of the N first laminations 11 near the axis of rotation K have first protrusions 1111, and M > 2N ₂ . Exemplary, when M is 3, N ₂ Can take a value of 1; when M is 5, N ₂ The value may be 1 or 2. It can be appreciated that in the present embodiment, the total number (M) of the first laminations 11 of the first core unit 10 in the direction parallel to the rotational axis K is greater than twice the number (2N ₂ ). That is, among the M first laminations 11 described above, the number of first laminations 11 having no first projection 1111 at the end of the first side 111 near the rotational axis K is greater than the number of first laminations 11 having the first projection 1111. Because of the above number relationship, this embodiment also defines M to be greater than or equal to 3. It will be appreciated that the arrangement described above may be such that most of the first laminations 11 in a direction parallel to the rotational axis K have no first projections 1111 and a few (at least one) of the first laminations 11 have first projections 1111, thereby ensuring both a limiting effect and reducing the magnetic leakage effect of the first projections 1111 on the whole first core unit 10. It should be noted that, the definition of the first protrusion 1111 in the above embodiment may be combined with the definition of other protrusion structures, which will not be repeated here.

In the first core unit 10, both the first lamination 11 having the first protrusion 1111 and the first lamination 11 having no first protrusion 1111 may have different arrangements. To reduce the magnetic leakage effect caused by radially adjacent first projections 1111, see fig. 14-17, in some embodiments, at most one first side 111 of each adjacent two first laminations 11 has a first projection 1111 at an end thereof adjacent to the rotational axis K in a direction parallel to the rotational axis K. It will be appreciated that in this embodiment, the kinds of two adjacent first laminates 11 may include two cases, one of which is that one first laminate 11 has a first protrusion 1111 and the other first laminate 11 does not have a first protrusion 1111; another case is that neither of the first laminates 11 has a first protrusion 1111. The above arrangement may allow a certain gap (or only one first projection 1111) between the plurality of first projections 1111 in the direction parallel to the rotation axis K, so that it is possible to avoid a larger magnetic leakage effect caused by the adjacent two first projections 1111. It should be noted that, the definition of the first protrusion 1111 in the above embodiment may be combined with the definition of other protrusion structures, which will not be repeated here.

In order to make the limiting effect of the first protrusions 1111 on the permanent magnet 20 more stable, protruding structures may be provided at both ends of the permanent magnet 20, respectively. Thus, referring to fig. 14-17, in some embodiments, the rotor core 1 may have a first plane that is perpendicular to the axis of rotation K. Each first lamination 11 may be symmetrically arranged about the first plane. At least one end of the first side 111, which is adjacent to the rotation axis K, has a first projection 1111 on both sides of the first plane in a direction parallel to the rotation axis K. It will be appreciated that the plurality of first laminations 11 may be symmetrically distributed with respect to a first plane along a direction parallel to the axis of rotation K (the first plane may pass through the first laminations 11 at a median position along the axis when the total number of first laminations 11 is odd). It will be appreciated that the plurality of first laminations 11 may be distributed on both sides (either uniformly or unevenly) of the first plane in a direction parallel to the axis of rotation K, with at least one first side 111 having a first projection 1111 at the end thereof adjacent to the axis of rotation K. The above arrangement enables the first protrusions 1111 to be correspondingly located on both sides of the permanent magnet 20 in a direction parallel to the rotation axis K, thereby making the limiting action of the first protrusions 1111 more stable. It should be noted that, the definition of the first protrusion 1111 in the above embodiment may be combined with the definition of other protrusion structures, which will not be repeated here.

For the embodiment in which the first protrusions 1111 are disposed at both sides of the first plane as described above. In some embodiments, the number of first protrusions 1111 on one side of the first plane may be the same as or different from the other side in a direction parallel to the rotation axis K. In some embodiments, the first laminations 11 having the first protrusions 1111 at the end of the first side 111 near the rotation axis K may be respectively located at two ends (one end may have one or more first protrusions 1111) of the first core unit 10 in a direction parallel to the rotation axis K, and the end of the portion of the plurality of first laminations 11 between the two ends near the rotation axis K does not have the first protrusions 1111.

For an arrangement of a plurality of core units 100, referring to fig. 13, in some embodiments, each core unit 100 may be disconnected from each other. It is understood that the above arrangement may make the plurality of core units 100 have no connection structure with each other, so that the magnetic leakage effect may be further reduced. In some embodiments, the shape and structure of each core unit 100 may be identical (or similar). It will be appreciated that the above arrangement may enable the first core unit 10 and the plurality of core units 100 having the same (or similar) shape and structure as the first core unit 10 to be arranged around the rotation axis K of the rotor core 1, and each core unit 100 has a protrusion limit structure similar to the first core unit 10, so that the plurality of permanent magnets 20 can be conveniently mounted in the accommodating space 30 along the circumferential direction W of the rotation axis K.

Structure to description and limitation of the above embodiments on the protrusion structure, in order to simultaneously make a plurality of protrusion structures commonly play a good abutment limiting role and reduce the manufacturing cost of the rotor core 1 as a whole, a specific structure of the rotor core 1 is exemplified as follows. In some embodiments, the core units 100 of the rotor core 1 are all arranged at intervals, and the shape and structure of each core unit 100 are the same, that is, each core unit 100 is formed by a plurality of stacked laminations, and when two adjacent sections of laminations are stacked, the central holes of the two sections of laminations can be aligned. Referring to fig. 2 to 3, referring to the first core unit 10, in a first arrangement, the first lamination 11 stacked on the first layer may be a first pair of side lamination 113, that is, the first lamination 11 has the first protrusion 1111 and the second protrusion 1112 on the same side at the first side 111, and the first lamination 11 stacked on the second layer may be a second pair of side lamination 114, that is, the first lamination 11 has the third protrusion 1121 and the fourth protrusion 1122 on the same side at the second side 112, and thereafter the stacked first lamination 11 is sequentially stacked in the order of the first pair of side lamination 113 and the second pair of side lamination 114; referring to fig. 14-15, in a second arrangement, the first laminate 11 laminated to the first layer may be a third pair of side laminates 115, i.e., the first laminate 11 having a first projection 1111 on the first side 111 and a fourth projection 1122 on the second side 112, both projections being on opposite sides, and adjacent thereto, the first laminate 11 laminated to the second layer may be a fourth pair of side laminates 116, i.e., the first laminate 11 having a second projection 1112 on the first side 111 and a third projection 1121 on the second side 112, both projections being on opposite sides, after which the laminated first laminate 11 is laminated in sequence with the third pair of side laminates 115, the fourth pair of side laminates 116; in addition, referring to fig. 16 to 17, in the third arrangement, in the direction parallel to the rotation axis K, the stacked first laminates 11 may be first opposite laminates 113, during stacking, the first opposite laminates 113 stacked on the first layer may be stacked in the forward direction, and when stacking the second layer, the first opposite laminates 113 are stacked in the reverse direction by 90 ° around the axis perpendicular to the rotation axis K, that is, the adjacent two laminates may have the protruding structures in mirror image after being turned over, and thereafter, the stacked first laminates 11 are stacked in the forward direction and then stacked in the reverse direction. All three arrangements mentioned above enable the protruding structures of two adjacent first laminations 11 to be staggered. The above description is merely exemplary, the axial staggered lamination mode is not limited to the above 3 modes, and the lamination mode may be freely combined, and the four protruding structures are implemented on the outer side surface of the core unit 100 in the axial direction when viewed along the direction parallel to the rotation axis K, so that the permanent magnet 20 may obtain a better spacing supporting effect.

In some embodiments, the laminations of the core unit 100 may also be stacked in sections. Specifically, in some specific embodiments, the extension length of the first protrusion 1111 may be 1.8mm and the extension length of the fourth protrusion 1122 may be 1.4mm, with respect to the vertical direction of the interface P defined at the interface of the abutment end 1114 and the first permanent magnet 21, and furthermore, the size of the fourth protrusion 1122 in the abutment direction (first direction X) may be 0.3mm, the size of the first protrusion 1111 in the abutment direction (first direction X) may be 0.92mm, the T may be 0.3mm, the size Hm of the permanent magnet 20 in the radial direction of the rotation axis K may be 24mm, and the total height of the rotor core 1 stack (required to be stacked in the axial direction) may be l=30 mm, and the first core unit 10 may be divided into 5 segments, and the core stack thickness Δl=20×t of each segment. After stacking, the permanent magnets 20 can be well fixed by staggered arrangement of the protruding structures between the two adjacent first laminations 11, so that the structural strength of the rotor core 1 is guaranteed, magnetic leakage is reduced, and in some embodiments, by adopting the arrangement, the no-load opposite potential of the motor can be improved by 3.5%, and the motor efficiency can be improved by 0.7%. In addition, due to the reduction of the number of the protruding structures, waste materials generated in the punching process of the iron core materials are reduced, and the utilization rate of the materials is further improved, so that the ratio of the efficiency to the cost of the motor is high.

In some embodiments, an end of the first protrusion 1111 or the second protrusion 1112 away from the rotation axis K (an end adapted to face the stator assembly 50) may have a unfilled corner in a direction perpendicular to the rotation axis K, which allows the extension dimension of the first protrusion 1111 or the second protrusion 1112 corresponding to the circumferential direction W to gradually decrease in a direction directed toward the stator assembly 50 along the rotation axis K. The arrangement facilitates filling of the injection molding body 60 at the unfilled corner and improves the connection stability of the injection molding body 60 connected at the unfilled corner; on the other hand, the unfilled corner can also be used for adjusting the air gap 70 at the periphery of the first lamination 11 (the end surface far away from the rotation axis K), so that the change of the air gap 70 is smoother, the sine degree of the magnetic field of the air gap 70 is improved, and the motor efficiency is improved.

Referring to fig. 18, an embodiment of the second aspect of the present invention also provides a rotor assembly 40, the rotor assembly 40 comprising the rotor core 1 of any of the above embodiments. In some embodiments, the rotor assembly 40 may also include a plurality of permanent magnets 20 or spindles or injection molded bodies 60. Wherein, a plurality of permanent magnets 20 are disposed in the accommodating space 30, and the different arrangement modes of the permanent magnets 20 can be referred to above. The rotor core 1 and the permanent magnet 20 are connected by adopting the injection molding body 60, specifically, the two axial ends of the rotor core 1 and the permanent magnet 20 are integrally cast, so that the structural strength of the rotor core is further increased, the risks that the permanent magnet 20 axially moves and the outer core is separated and thrown out in the rotation process are prevented, and the rotor core is integrally packaged by the thermosetting plastic PBT, so that the safety of the rotor assembly 40 of the permanent magnet motor in the high-speed heavy-load operation process is ensured. In some embodiments, the rotor assembly 40 may have a shaft hole 121, and the rotor core 1 may include a core unit 100 provided separately and an inner core 120 provided integrally, which may be connected by means of the injection-molded body 60. In order to make the connection between the inner core 120 and the injection-molded body 60 of the outer core unit 100 more reliable, the inner core 120 may further have a tooth-shaped groove 122 near the outer circumference of the outer core unit 100, so that the injection-molded body 60 may be filled in the tooth-shaped groove 122 to form a clamping effect on the inner core 120. The inner core 120 may have a ring shape to define a shaft hole 121. Thus, in some embodiments, the shaft may be press-fitted into the shaft hole 121 provided in the rotor assembly 40, and in other embodiments, the shaft may be integrally injection molded with the rotor body or injection molded body 60. The injection body 60 may be coated outside the rotor core 1, and the injection body 60 may fill a gap between the core unit 100 and the inner core 120, or may fill a gap between the inner core 120 and the rotating shaft. Depending on the application requirements, the injection molding body 60 may be made of various plastics or plastic materials, and in some embodiments, the injection molding body 60 may be made of PBT material, so that the injection molding body 60 has high heat resistance, toughness and fatigue resistance.

For the connection mode of the injection molding body 60, in some embodiments, the injection molding body 60 may connect the rotor core 1 and the permanent magnet 20 respectively to fix the relative positions of the rotor core 1 and the permanent magnet 20, and when the rotor core 1 and the permanent magnet 20 have a connection relationship, the injection molding body 60 may play a role of further connecting the rotor core 1 and the permanent magnet 20, thereby improving connection stability; in other embodiments, the core units 100 may be disposed at intervals, and the injection molding body 60 may connect the core units 100. It will be appreciated that the injection molded body 60 may also be used to connect a plurality of core units 100 together as a single piece; in still other embodiments, the injection molding body 60 may also be used to integrally connect the rotating shaft with the rotor core 1 so that the rotor core 1 can rotate around the rotating shaft. Referring to fig. 18, in still other embodiments, the rotor core 1 may include a core unit 100 and an inner core 120, the core unit 100 may be spaced apart from the inner core 120, and the injection-molded body 60 may connect the core unit 100 and the inner core 120.

Embodiments of the third aspect of the present invention also provide an electric machine comprising a rotor assembly 40 and a stator assembly 50 of any of the embodiments described above. Referring to fig. 19, a stator assembly 50 may be disposed around the rotor assembly 40. The stator assembly 50 is spaced apart from the rotor assembly 40 in the radial direction of the rotor core 1, with an air gap 70 between the stator assembly 50 and the rotor assembly 40 for adjusting the magnetic field and facilitating the rotation of the rotor. The stator assembly 50 includes a yoke 51, teeth 52, and shoes 53. The plurality of teeth 52 are arranged at intervals along the circumferential direction W, the teeth 52 are used for winding coils, and a winding groove 521 with an opening is formed between two adjacent teeth 52 along the circumferential direction W. The opening is provided on the side of the stator assembly 50 close to the rotor core 1. Each tooth 52 is connected to a side of the yoke 51 near the rotor core 1. In the radial direction of the rotor core 1, the tooth 52 has one end connected to the yoke 51 and the other end provided with two first projections 1111, respectively, the two first projections 1111 being arranged opposite to each other in the circumferential direction W. The shoe 53 is connected to one end of the tooth 52 near the rotor assembly 40 and extends in a circumferential direction W around the rotational axis K, and the windings of the stator may be sleeved outside the tooth 52 and radially defined by the shoe 53 to prevent displacement or detachment of the windings. The two shoes 53 opposite to the adjacent two teeth 52 may define an opening of the wire winding groove 521 therebetween in the circumferential direction W. The yoke 51 is provided with peripheral grooves 54 corresponding to the teeth 52 one by one on a side facing away from the teeth 52, and the peripheral area of the side wall surface of the peripheral grooves 54 is gradually reduced along the radial direction of the rotor core 1 and along the direction of the rotor core 1 pointing to the stator assembly 50. The peripheral groove 54 may be used for winding wire or injection molding the stator assembly 50. The yoke 51 has a first inner wall surface 511 and a second inner wall surface 512 on the side close to the rotor core 1, which form a winding groove 521, and adjacent tooth portions 52 are connected to the first inner wall surface 511 and the second inner wall surface 512, respectively, and the first inner wall surface 511 and the second inner wall surface 512 are disposed so as to intersect.

In some embodiments, rotor assembly 40 and stator assembly 50 are separately molded and assembled into a complete motor. Thanks to the improvement of the rotor core 1, the motor of the present embodiment has the same technical effects as the rotor core 1, and the motor of the present invention can be applied to occasions with high efficiency requirements and low cost.

Embodiments of the fourth aspect of the present invention also provide a ventilation apparatus comprising the motor of any of the embodiments described above. Thanks to the improvement of the rotor core 1, the ventilation apparatus of the present embodiment has the same technical effects as the rotor core 1 described above, and will not be described here again.

Further, thanks to the improvement of the rotor assembly 40 core by the above-described embodiments, the rotor assembly 40 of the second aspect embodiment of the present invention and the motor of the third aspect embodiment have the same technical effects as the rotor core 1 in the above-described embodiments. And will not be described in detail herein.

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

Claims

1. A rotor core, characterized by comprising a plurality of core units arranged around a rotation axis of the rotor core, wherein each two adjacent core units define an accommodating space therebetween, 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 around the rotation axis;

the first core unit includes M first laminations arranged in a stacked manner in a direction parallel to the rotational axis, each of the first laminations having a first side edge located at one side in the circumferential direction, not more than N ₁ A plurality of first side edges, at least one of the first side edgesThe end of the side away from the rotation axis is provided with a first bulge, and the first bulge is suitable for abutting against one end of the permanent magnet away from the rotation axis;

wherein N is more than or equal to 1 ₁ ＜M。

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

no more than N ₁ The end of at least one first side edge, which is close to the rotation axis, is provided with a second bulge, and the second bulge is suitable for abutting against one end, close to the rotation axis, of the permanent magnet;

And/or the number of the groups of groups,

each of the first laminations has a second side edge disposed opposite the first side edge in the circumferential direction, no more than N ₁ The end of at least one second side edge far away from the rotation axis is provided with a third bulge, and the third bulge is suitable for abutting against one end of the permanent magnet far away from the rotation axis;

and/or the number of the groups of groups,

each of the first laminations has a second side edge disposed opposite the first side edge in the circumferential direction, no more than N ₁ The end of at least one second side edge, which is close to the rotation axis, is provided with a fourth bulge, and the fourth bulge is suitable for abutting against one end, close to the rotation axis, of the permanent magnet.

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

each of the first laminations has a second side edge disposed opposite the first side edge in the circumferential direction, N ₂ The end of the first side edge far away from the rotation axis is provided with the first bulge, N ₂ The end of the first side edge near the rotation axis is provided with a second bulge, N ₂ The end of the second side edge far away from the rotation axis is provided with a third bulge, N ₂ The end of the second side edge near the rotation axis is provided with a fourth bulge, and the second bulge and the first bulge The fourth protrusion is suitable for abutting against one end of the permanent magnet close to the rotation axis, the fourth protrusion is suitable for abutting against one end of the permanent magnet far away from the rotation axis, and the following conditions are satisfied: n is more than or equal to 1 ₂ ≤N ₁ ＜M。

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

each of the first laminations includes no more than N ₁ The first pair of side laminates at least comprises one first pair of side laminates, the first pair of side laminates are provided with first protrusions at the end, away from the rotation axis, of the first side, and the first pair of side laminates are provided with second protrusions at the end, close to the rotation axis, of the first side, and the second protrusions are suitable for abutting against one end, close to the rotation axis, of the permanent magnet.

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

each of the first laminations has a second side edge arranged opposite to the first side edge in the circumferential direction, each of the first laminations further includes a second pair of side laminations having a third protrusion at an end of the second side edge remote from the rotation axis, the second pair of side laminations having a fourth protrusion at an end of the second side edge near the rotation axis, the third protrusion being adapted to abut against an end of the permanent magnet remote from the rotation axis, the fourth protrusion being adapted to abut against an end of the permanent magnet near the rotation axis, and the first pair of side laminations being arranged adjacent to the second pair of side laminations in a stacked manner.

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

each of the first laminations has a second side edge disposed opposite the first side edge in the circumferential direction, each of the first laminations including no more than N ₁ A third pair of side laminations including at least one of the third pair of side laminations having the first side edge at an end thereof remote from the axis of rotationThe first bulge is arranged at the end, close to the rotation axis, of the second side edge of the third pair of side laminates, and the fourth bulge is suitable for abutting against one end, close to the rotation axis, of the permanent magnet.

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

each of the first laminations further includes a fourth pair of side laminations having a second protrusion at an end of the first side adjacent the rotational axis, the fourth pair of side laminations having a third protrusion at an end of the second side remote from the rotational axis, the second protrusion being for abutting an end of the permanent magnet adjacent the rotational axis, the third protrusion being for abutting an end of the permanent magnet remote from the rotational axis, the third pair of side laminations being stacked adjacent the fourth pair of side laminations.

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

the first lamination has a dimension T in a direction parallel to the rotation axis, the first protrusion is suitable for abutting against one end of the permanent magnet away from the rotation axis in a first direction, and the maximum dimension of the first protrusion in the first direction is L ₁ And satisfies: l (L) ₁ ≥T；

And/or;

no more than N ₁ The end of at least one first side edge, which is close to the rotation axis, is provided with a second bulge, and the second bulge is suitable for abutting against one end, close to the rotation axis, of the permanent magnet along a second direction; the maximum dimension of the second protrusion along the second direction is L ₂ And satisfies: l (L) ₂ ≥T；

And/or;

each of the first laminations has a second side edge disposed opposite the first side edge in the circumferential direction, no more than N ₁ A third protrusion is arranged at the end of at least one of the second sides far from the rotation axis, the second protrusion is provided with a third protrusionThe three protrusions are suitable for abutting against one end, away from the rotation axis, of the permanent magnet along a third direction; the maximum dimension of the third protrusion along the third direction is L ₃ And satisfies: l (L) ₃ ≥T；

And/or;

Each of the first laminations has a second side edge disposed opposite the first side edge in the circumferential direction, no more than N ₁ The second side edges and the end of at least one second side edge close to the rotation axis are provided with a fourth bulge, and the fourth bulge is suitable for abutting against one end of the permanent magnet close to the rotation axis along a fourth direction; the maximum dimension of the fourth protrusion along the fourth direction is L ₄ And satisfies: l (L) ₄ ≥T。

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

the first side edge is provided with an abutting end, and the abutting end is suitable for abutting one side of the first permanent magnet along the circumferential direction, so that an interface is defined at the junction of the abutting end and the first permanent magnet;

in the circumferential direction, the maximum value of the distance between the end of the first side edge away from the rotation axis and the interface is greater than or equal to the maximum value of the distance between the end of the first side edge close to the rotation axis and the interface, and/or each first lamination has a second side edge arranged opposite to the first side edge along the circumferential direction, and the maximum value of the distance between the end of the second side edge away from the rotation axis and the interface is greater than the maximum value of the distance between the end of the second side edge close to the rotation axis and the interface along the reverse direction of the circumferential direction.

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

the first side edge is provided with an abutting end which is suitable for abutting one side of the first permanent magnet along the circumferential direction, so that an interface is defined at the junction of the abutting end and the first permanent magnet, and the distance between the interface and the first bulge reaches the fifth directionMaximum value L ₅ The maximum dimension of the first permanent magnet along the fifth direction is L ₆ And satisfies: l (L) ₆ /3≥L ₅ 。

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

in each adjacent two of the first laminations, at most one of the first sides has the first projection at an end thereof remote from the axis of rotation in a direction parallel to the axis of rotation.

12. 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.

13. A rotor assembly, comprising:

the rotor core of any one of claims 1-12; the method comprises the steps of,

the permanent magnets are arranged in the corresponding accommodating spaces.

14. An electric machine, comprising:

the rotor assembly of claim 13; the method comprises the steps of,

A stator assembly.

15. A ventilation device comprising the motor of claim 14.