CN220673480U - Rotor core, rotor assembly, motor and household appliance - Google Patents
Rotor core, rotor assembly, motor and household appliance Download PDFInfo
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- CN220673480U CN220673480U CN202322387776.0U CN202322387776U CN220673480U CN 220673480 U CN220673480 U CN 220673480U CN 202322387776 U CN202322387776 U CN 202322387776U CN 220673480 U CN220673480 U CN 220673480U
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- 238000003475 lamination Methods 0.000 claims abstract description 135
- 238000001746 injection moulding Methods 0.000 claims abstract description 79
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 31
- 230000004308 accommodation Effects 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 6
- 230000002093 peripheral effect Effects 0.000 description 12
- 230000000670 limiting effect Effects 0.000 description 11
- 239000012778 molding material Substances 0.000 description 10
- 230000002708 enhancing effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The utility model provides a rotor core, a rotor assembly, a motor and a household appliance, wherein the rotor core comprises a plurality of core units which are arranged around the rotation axis of the rotor core, one of the core units is a first core unit, the first core unit is disconnected with other core units along the circumferential direction of the rotation axis, the first core unit comprises a plurality of laminations which are arranged in a lamination way along the direction parallel to the rotation axis, and one of the laminations is a first lamination; the first lamination has a first side wall capable of facing one side of the permanent magnet, the first side wall defining a first slot spaced from an end of the first side wall near the axis of rotation, the first slot being for injection molding. The arrangement of the side wall grooves enables the injection molding body to be connected with the rotor iron core and the permanent magnet at the same time, and limits the radial displacement of the rotor iron core, so that the connection tightness of the rotor iron core can be enhanced.
Description
Technical Field
The utility model relates to the technical field of motors, in particular to a rotor core, a rotor assembly, a motor and a household appliance.
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. To meet the demands of current household appliances, motors are often designed towards high power density. In the existing rotor core, the core units are manufactured into a block structure, namely, the core units are not directly connected, but are connected into a whole by filling injection molding materials among the core units. The rotor core with the design can reduce magnetic leakage and improve the power density of the motor, but the iron core units of all the blocks are only connected to the injection molding body, so that the structure strength is weaker, the connection between the iron core units and the injection molding body is easy to loosen or separate along with the rotary motion of the rotor core, and particularly the radial force born by the iron core units can directly lead the iron core units to separate from the connection with the injection molding body, thereby influencing the service performance of the rotor core and even leading to motor faults.
Therefore, how to ensure the connection strength of the rotor core under the condition of realizing high power density and production and manufacture is a technical problem to be solved in the field.
Disclosure of Invention
The utility model mainly aims to provide a rotor core, a rotor assembly, a motor and a household appliance, which can enhance the connection compactness of the rotor core.
In order to achieve the above purpose, the embodiment of the present utility model adopts the following technical scheme:
a rotor core including a plurality of core units arranged around a rotation axis of the rotor core, one of the core units being a first core unit which is disconnected from the other core units in a circumferential direction of the rotation axis, the first core unit including a plurality of laminations arranged in a stacked manner in a direction parallel to the rotation axis, one of the laminations being a first lamination;
the first lamination has a first side wall capable of facing one side of the permanent magnet, the first side wall defining a first slot spaced from an end of the first side wall near the axis of rotation, the first slot being for injection molding.
In some embodiments, the end of the first lamination remote from the axis of rotation is of dimension L 1 ；
The radial dimension L of the first groove body along the rotation axis 2 The method meets the following conditions: l (L) 2 ＜0.3L 1 ，
And/or the number of the groups of groups,
the circumferential dimension L of the first groove body along the rotation axis 3 The method meets the following conditions: l (L) 3 ＜0.15L 1 。
In some embodiments, the end of the first lamination remote from the axis of rotation is a dimension L, in a radial direction of the axis of rotation, from the end of the first lamination proximate to the axis of rotation 4 The minimum dimension L of the first slot body from the end of the first lamination close to the rotation axis 5 The method meets the following conditions: l (L) 5 ≥L 4 /2。
In some embodiments, the first sidewall has a first end surface for defining a first slot, the first end surface being connected to an end of the first sidewall proximate the axis of rotation, the first end surface being perpendicular to a radial direction of the axis of rotation.
In some embodiments, the first channel is a rectangular channel; or the first groove body is an arc groove; or, the first groove body is a triangular groove.
In some embodiments, the first sidewall further defines a second channel on a side of the first channel proximate the axis of rotation, the second channel for injection molding.
In some embodiments, the first lamination further has a second sidewall disposed opposite the first sidewall in a circumferential direction of the rotation axis, the first sidewall being capable of facing the permanent magnet on one side of the first lamination and the second sidewall being capable of facing the permanent magnet on the other side of the first lamination, the second sidewall defining a third slot spaced from an end of the second sidewall proximate the rotation axis, the third slot being for injection molding.
In some embodiments, the first and third slots are symmetrically arranged about a first plane, with the axis of rotation lying in the first plane.
In some embodiments, the first core unit further comprises a second lamination having a third sidewall capable of facing one side of the permanent magnet, the third sidewall having a first protrusion at an end thereof near the rotation axis for abutting an end thereof near the rotation axis;
along the direction parallel to the rotation axis, two ends of the first iron core unit are provided with a first lamination, and at least one second lamination is positioned between the two ends of the first iron core unit.
Embodiments of the second aspect of the present utility model also provide a rotor assembly including the rotor core of any of the above embodiments; an injection molding body; and a plurality of permanent magnets, wherein an accommodating space is defined between every two adjacent iron core units, and at least one permanent magnet is respectively arranged in each accommodating space.
In some embodiments, the plurality of permanent magnets includes a first magnet facing the first sidewall, the wall of the first magnet facing the first sidewall having a second protrusion located at least partially within the first slot, the second protrusion facing radially of the axis of rotation on a side of the second protrusion closer to the axis of rotation and facing away from the axis of rotation.
The embodiment of the third aspect of the present utility model also provides a rotor assembly including a plurality of permanent magnets, an injection molded body, and a rotor core including a plurality of core units arranged around a rotation axis of the rotor core, each adjacent two core units defining an accommodating space therebetween for accommodating the permanent magnets, one of the core units being a first core unit which is disconnected from the other core units in a circumferential direction of the rotation axis, the first core unit including a plurality of laminations arranged in a stacked manner in a direction parallel to the rotation axis, one of the laminations being a first lamination;
The first lamination has a first sidewall facing one side of the permanent magnet, the first sidewall and the permanent magnet together define a filling space for filling the injection body, the filling space includes a first gap and a second gap, the first gap is located at one side of the second gap away from the rotation axis, and the first gap is larger than the second gap.
Embodiments of the third aspect of the utility model also provide an electrical machine comprising a rotor assembly of any of the embodiments described above.
An embodiment of the fourth aspect of the utility model also provides a household appliance comprising the motor of any of the embodiments described above.
Compared with the prior art, the utility model has the beneficial effects that:
in the technical scheme of the utility model, an accommodating space can be defined between two adjacent iron core units of the rotor iron core, a first lamination in the iron core units is provided with a first side wall which can face the permanent magnet, the first side wall defines a first groove body which is separated from the end part of the first side wall, which is close to the rotation axis, so that the connection tightness of the rotor iron core can be enhanced by the first groove body and the filled injection molding between the permanent magnets. Specifically, the injection molding body in the first groove body can be simultaneously connected with the first lamination and the permanent magnet, the injection molding connection area of the first lamination is increased on the side wall, the injection molding body can form a limiting clamping effect with the first groove body, and when the first lamination is subjected to acting force along the radial direction, the injection molding body in the first groove body can be abutted against the first groove body, so that the injection molding body can generate limiting acting force along the radial direction on the first lamination to limit the displacement of the first lamination along the radial direction. At the same time, the injection molding can apply a force directed from the outer peripheral portion to the inner peripheral portion of the first lamination to the first lamination, which can effectively suppress centrifugal force directed from the inner peripheral portion to the outer peripheral portion of the first lamination. Therefore, the side wall of the rotor core facing the permanent magnet is provided with the groove body for injection molding, and the groove of the side wall enables the injection molding to be connected with the rotor core and the permanent magnet at the same time and limits the displacement of the rotor core along the radial direction, so that the connection tightness of the rotor core can be enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic side view of a rotor core provided in a first embodiment of the present utility model;
FIG. 2 is a schematic side view of a first laminate provided in a second embodiment of the utility model;
FIG. 3 is a schematic side view of a first laminate provided in a third embodiment of the utility model;
FIG. 4 is a schematic side view of a first laminate provided in a fourth embodiment of the utility model; wherein the dash-dot line indicates a part of the radial direction and a part of the circumferential direction of the rotation axis;
FIG. 5 is a schematic side view of a first laminate provided in a fifth embodiment of the utility model;
FIG. 6 is a schematic side view of a first laminate provided in a sixth embodiment of the utility model;
FIG. 7 is a schematic side view of a first laminate provided in a seventh embodiment of the utility model;
FIG. 8 is a schematic side view of a first laminate provided in an eighth embodiment of the utility model;
FIG. 9 is a schematic side view of a second laminate provided in a ninth embodiment of the utility model;
FIG. 10 is a schematic side view of a second laminate provided in a tenth embodiment of the utility model;
FIG. 11 is a perspective view of a first laminate and a second laminate combined according to a tenth embodiment of the present utility model;
FIG. 12 is a schematic side view of a rotor assembly provided in an embodiment of a second aspect of the present utility model;
FIG. 13 is a schematic side view of a first lamination in combination with a permanent magnet provided in another embodiment of a second aspect of the utility model;
FIG. 14 is a schematic side view of a rotor assembly provided in an embodiment of a third aspect of the present utility model;
FIG. 15 is an enlarged partial schematic view of FIG. 14A;
FIG. 16 is a schematic side view of a rotor assembly provided in another embodiment of a third aspect of the present utility model; wherein the dashed line indicates the boundary between the first gap and the second gap.
Reference numerals illustrate:
10-rotor core;
100 a-a first core unit;
110 a-a first lamination;
111 a-a first sidewall; 1111 a-a first tank; 1112 a-a second groove; 1113 a-a first end face;
112 a-a second sidewall; 1121 a-a third tank;
120 a-a second lamination;
121 a-a third sidewall; 1211 a-a first protrusion;
200-permanent magnets; 210-a first magnet; 211-second protrusions;
300 a-rotor assembly;
400-injection molding;
300 b-rotor assembly;
310 b-rotor core;
311 b-a first core unit;
3111 b-first lamination;
31111 b-a first sidewall;
600-filling the space; 610-a first gap; 620-a second gap;
p-first plane.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, if a directional indication (such as up, down, left, right, front, and rear … …) is included in the embodiment of the present utility model, the directional indication is merely used to explain a relative positional relationship, a movement condition, and the like between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or", "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B ", including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
In the existing rotor core, the core units are manufactured into a block structure, namely, the core units are not directly connected, but are connected into a whole by filling injection molding materials among the core units. The rotor core design of above-mentioned design can reduce the magnetic leakage, promotes motor power density, but the iron core unit of each piecemeal only connects in the body of moulding plastics, and structural strength is weaker, along with rotor core's rotary motion, is connected between iron core unit and the body of moulding plastics and becomes flexible easily or break away from, and especially the radial force that iron core unit received can directly lead to the iron core unit to break away from with the connection of the body of moulding plastics to can influence rotor core's performance, lead to the motor trouble even.
Specifically, a part of binding force of the segmented iron core units in the conventional scheme comes from injection molding connection of the inner side part of the iron core unit close to the rotation axis, and along the circumferential direction of the rotation axis, the inner side area of each rotor unit can enclose an inner side annular area of the rotor iron core, and the area can be filled with injection molding materials so as to connect the inner side part of each iron core unit; in addition, the binding force of the other part of the segmented iron core units is from the injection molding connection of the outer side part of the iron core units, which is far away from the rotation axis, and the outer peripheral wall surface of each iron core unit is connected with an injection molding body which is arranged around the outer periphery of the rotor iron core; the problem with the above arrangement is that although the annular region inside the rotor core forms an integral injection molding body, the injection molding body is still only connected to the end of the inner side of each core unit, the area available for connection of this portion is small, and good bonding effect cannot be ensured; in addition, the filling size of the outer part of the rotor core is limited by the design size of the rotor assembly, so that the connection strength of the injection molding body of the outer part is insufficient; meanwhile, a gap between the rotor core and the permanent magnet is formed on the side wall of the rotor core along the circumferential direction of the rotation axis, so that the rotor core and the permanent magnet are in close fit, the injection molding material which can flow in the gap is less, and the improvement effect on the connection tightness is not obvious. By analyzing the above phenomenon, the existing split rotor core is already provided with an injection molding body as a connection during manufacturing, so that related technicians often only pay attention to the problem of installation stability of the permanent magnet, and want to neglect the problem of insufficient binding force of the core unit, the problem that the core unit is separated from the connection with the injection molding body along the radial direction due to insufficient binding force, particularly the centrifugal force of the rotor core unit on the peripheral part is larger, the connection of the rotor core unit is easier to separate, and the problem is more obvious when the rotor core is larger and the rotating speed is faster, so that the use of the rotor core is greatly influenced.
In view of this, referring to fig. 1 to 13, an embodiment of the first aspect of the present utility model provides a rotor core 10 capable of improving the tightness of the injection-molded connection of the rotor core 10.
The rotor core 10 includes a plurality of core units arranged around a rotation axis of the rotor core 10, and an accommodation space is defined between two adjacent core units, the accommodation space being for accommodating the permanent magnet 200, one of the core units being a first core unit 100a, the first core unit 100a being disconnected from the other core units in a circumferential direction of the rotation axis. It will be appreciated that in some embodiments, a plurality of core units are arranged around the rotation axis to constitute a plurality of unit bodies of the rotor core 10. According to the above arrangement, the core units may be arranged circumferentially in a sector-like manner as viewed in a direction parallel to the rotation axis, and the core units may be arranged at equal intervals in the circumferential direction of the rotation axis. Illustratively, referring to fig. 1, in some embodiments, the rotor core 10 has ten core units.
Based on the surrounding arrangement of the respective core units, an accommodation space is defined between the adjacent two core units, the accommodation space being for accommodating the permanent magnet 200. It will be appreciated that there is a gap between two adjacent core units that can accommodate the permanent magnet 200. In some embodiments, a certain gap may be formed between the whole wall surface of the iron core unit and the permanent magnet 200, so as to facilitate the installation or fixation of the permanent magnet 200; or the permanent magnet 200 may form an interference fit with an adjacent core unit to achieve the connection.
Referring to fig. 1, in the present embodiment, ten core units may collectively define ten accommodation spaces, so that a rotor assembly 300a having the rotor core 10 needs to be provided with ten permanent magnets 200 correspondingly, and the ten permanent magnets 200 are provided in the ten accommodation spaces in a one-to-one correspondence. In another embodiment, there may be a space between the permanent magnets 200 and the core unit, so that a filling material may be placed between two opposite parallel walls, thereby fixing the relative position between the permanent magnets 200 or fixing the relative position between the permanent magnets 200 and the core unit. In yet another embodiment, a plurality of permanent magnets 200 may be correspondingly disposed in a single accommodation space. In some embodiments, referring to fig. 1, a maximum dimension of the permanent magnet 200 in a radial direction of the rotor assembly 300a may correspond to a maximum dimension of the receiving space in a radial direction of the rotor assembly 300 a. According to the above arrangement, the accommodation space may be defined by two wall surfaces circumferentially opposed between the adjacent two core units.
The core units in the rotor core 10 may be connected to each other to maintain the integrity of the rotor core 10, or may be disconnected from each other to avoid magnetic leakage at the connection. Illustratively, referring to fig. 1, in this embodiment, each core unit is disposed apart from each other. In other embodiments, a portion of the core units are connected to each other, and each of the other portion of the core units is disconnected from the other core units.
Referring to fig. 1, one of the core units is a first core unit 100a. The first core unit 100a is disconnected from the other core units in the circumferential direction of the rotation axis. The description and illustration of the rotor core 10 according to the present utility model correspond to the rotor core 10 being in a state of not being assembled into the rotor assembly 300a and being before injection molding. Thus, in some embodiments, the state in which the first core unit 100a is disconnected from the other core units may be understood as that the first core unit 100a is disposed separately from the other core units in one manufacturing process of the rotor core 10, and in a subsequent manufacturing step, the rotor core 10 may be coupled as a whole using an injection molding process.
Referring to fig. 1-2, the first core unit 100a includes a plurality of laminations arranged one above the other in a direction parallel to the rotational axis, one of the laminations being a first lamination 110a. It will be appreciated that at least one of the laminations is a first lamination 110a, and thus in some embodiments, a plurality of first laminations 110a may be included in each lamination in the first core unit 100a.
Referring to fig. 2, based on the above-described configuration, the first lamination 110a has a first sidewall 111a, and the first sidewall 111a can face one side of the permanent magnet 200. It is understood that the first side wall 111a is a side wall surface disposed opposite to the side wall of the permanent magnet 200. In combination with the above description of the connection manner of the permanent magnet 200, in various embodiments, a certain gap may be formed between the first sidewall 111a and the permanent magnet 200 as a whole, so as to facilitate the installation or fixation of the permanent magnet 200; or the first sidewall 111a may form an interference fit connection with the permanent magnet 200. For convenience of description, an embodiment in which a small gap is provided between the whole of the first sidewall 111a and the permanent magnet 200 to facilitate the insertion and installation of the permanent magnet 200 is taken as an illustration, and in such an embodiment, the above gap is used for the insertion and installation of the permanent magnet 200 and only a small amount of injection molding material can be flowed within a tolerance range, and further, different embodiments may be combined with each other between different technical schemes.
Referring to fig. 2, the first sidewall 111a defines a first groove 1111a, and the first groove 1111a is spaced apart from an end of the first sidewall 111a near the rotation axis. It is understood that the first groove 1111a is located at a side of the end of the first side wall 111a near the rotation axis, which is far from the rotation axis. In some embodiments, the first sidewall 111a has a recessed portion such that the first groove 1111a may be defined at the recessed portion of the first sidewall 111a. In various embodiments, the surface defining the first groove 1111a may be an integrally extended wall surface or may be a multi-stage extended wall surface. First groove 1111a for the above arrangement, first groove 1111a is used for injection molding. It is understood that the first sidewall 111a can define a first groove 1111a recessed toward a direction away from the permanent magnet 200, so that a space between the first groove 1111a and a wall surface of the permanent magnet 200 facing the first sidewall 111a can be used to fill injection molding material to form the injection molded body 400 filled in the first groove 1111a. In various embodiments, injection molded body 400 may fill the entire first slot 1111a, or may be at least partially disposed within first slot 1111a.
According to the combination of the above embodiments, it can be seen that in some embodiments, a receiving space can be defined between two adjacent core units of the rotor core 10, the first lamination 110a in the core unit has a first sidewall 111a capable of facing the permanent magnet 200, the first sidewall 111a defines a first slot 1111a spaced apart from an end of the first sidewall 111a near the rotation axis, and thus the filled injection-molded body 400 between the first slot 1111a and the permanent magnet 200 can enhance connection tightness of the rotor core 10. Specifically, the injection molding body 400 in the first slot 1111a can connect the first lamination 110a and the permanent magnet 200 at the same time, the injection molding connection area of the first lamination 110a is increased on the side wall, and the injection molding body 400 can form a limit clamping effect with the first slot 1111a, when the first lamination 110a receives a force along the radial direction, the injection molding body 400 in the first slot 1111a can abut against the first slot 1111a, so that the injection molding body 400 can generate a limit force along the radial direction to the first lamination 110a to limit the displacement of the first lamination 110a along the radial direction. Meanwhile, the injection body 400 can apply a force directed from the outer peripheral portion to the inner peripheral portion of the first lamination 110a to the first lamination 110a, which can effectively suppress centrifugal force directed from the inner peripheral portion to the outer peripheral portion of the first lamination 110 a. Therefore, the side wall of the rotor core 10 facing the permanent magnet 200 of the present utility model has a groove for injection molding, and the side wall is grooved to allow the injection molding 400 to be coupled to both the rotor core 10 and the permanent magnet 200 and to limit the displacement of the rotor core 10 in the radial direction, thereby enhancing the coupling tightness of the rotor core 10.
In some embodiments, the dimensions of the first slot 1111a may be defined such that the injection molding effect within the first slot 1111a is improved and the connection tightness of the rotor core 10 and the motor performance are better without affecting the performance of the rotor core 10 and the corresponding motor. It will be appreciated that if the size of the first slot 1111a is too large, the size of the magnetic conduction path formed by the rotor core 10 is easily too small, so that the saturation degree of the rotor core 10 is high, and the output torque of the motor and the efficiency of the motor are reduced. In order to avoid the saturation phenomenon of the rotor core 10 described above, the depth dimension of the first groove 1111a in the radial direction and the depth dimension in the circumferential direction may be limited to a certain range so as to satisfy the requirement that the saturation degree of the rotor core 10 is not too highOn the premise that the groove area at the first side wall 111a is larger, and more injection molding material can be filled, so that a better connection tightness enhancing effect is formed. Specifically, referring to FIG. 4, in some embodiments, the end of the first lamination 110a distal from the axis of rotation may be L in size from the axis of rotation 1 . Wherein the end of the first side wall 111a remote from the axis of rotation is understood to be the end of the first side wall 111a located radially outward, thus L 1 It is understood that the first lamination 110a is radially from the maximum of the axis of rotation. Based on the L 1 Size, exemplary, in some embodiments, the radial dimension L of the first slot 1111a along the axis of rotation 2 Can satisfy the following conditions: l (L) 2 ＜0.3L 1 Wherein L is 2 The depth of the first groove 1111a in the radial direction of the rotation axis can be understood as; in other embodiments, the first slot 1111a has a dimension L along the circumference of the rotational axis 3 Can satisfy the following conditions: l (L) 3 ＜0.15L 1 Wherein L is 3 The depth of the first groove 1111a in the circumferential direction of the rotation axis can be understood. It will be appreciated that in some embodiments, the dimensions of the first slot 1111a satisfying the above ranges enable the rotor core 10 to achieve a strong bond force within a suitable range of core saturation. The above-mentioned reference to L 2 L and 3 can be adjusted accordingly according to the rotor core 10 of different dimensions and different motor parameters, operating conditions.
As is apparent from the above description of the rotational state of the rotor core 10, the rotor core 10 is easily disconnected from the injection molded body 400 after receiving the force in the radial direction, and the rotor core 10 is mainly subjected to the centrifugal force when rotating. In order to make the rotor core 10 of the present utility model more effective in suppressing centrifugal force, the installation position of the first groove 1111a may be further defined. Specifically, referring to FIG. 4, in some embodiments, the end of the first lamination 110a distal from the axis of rotation of the second sidewall 31112b is sized L from the end of the first lamination 110a proximal to the axis of rotation of the second sidewall 31112b 4 . Referring to FIG. 4, in someIn the embodiment, the end of the first lamination 110a away from the rotation axis may be understood as the end of the first lamination 110a located on the outer side in the radial direction, and similarly, the end of the first lamination 110a near the rotation axis may be understood as the end of the first lamination 110a located on the inner side in the radial direction, and thus L 4 It is understood that the distance between both ends of the first lamination 110a in the radial direction of the rotation axis. Based on the above definition, in some embodiments, the first slot 1111a is a minimum dimension L from the end of the first lamination 110a proximate the axis of rotation of the second sidewall 31112b 5 Can satisfy the following conditions: l (L) 5 ≥L 4 /2. Likewise, L 5 It can be understood that the minimum distance between the radial first groove 1111a along the rotation axis and the end of the first lamination 110a near the rotation axis of the second sidewall 31112b is thus satisfied by L 5 ≥L 4 The first groove 1111a may be located between a midpoint of both ends of the first lamination 110a in the radial direction and the outer circumferential wall of the first lamination 110a at the first groove 1111a. It will be appreciated that the first slot 1111a may be located on a side of the first sidewall 111a close to the outer periphery of the first lamination 110a, and the centrifugal force applied to the rotor core 10 at each position is proportional to the distance between the position and the rotation axis, so that the centrifugal force at the first slot 1111a is greater, and the limiting force of the injection molding body 400 on the first lamination 110a towards the inner side is derived from the counter force of the centrifugal force, so that the limiting force of the injection molding body 400 in the first slot 1111a on the first lamination 110a towards the inner side is greater, and better centrifugal force limiting effect is provided.
Referring to fig. 4-6, in some embodiments, the first sidewall 111a can have a first sidewall 1113a, and the first sidewall 1113a can be connected to an end of the first sidewall 111a proximate the axis of rotation. It is to be understood that the first side wall 1113a is a surface of the first side wall 111a on a side close to the rotation axis. In some embodiments, the first sidewall 111a may be a multi-section wall, and the multi-section wall includes the first sidewall 1113a therein. In some embodiments, the first sidewall 1113a may be perpendicular to the radial direction of the axis of rotation. It will be appreciated that the above arrangement makes the injection molding body 400 connected at the first sidewall 1113a correspondingly planar, so that the injection molding body 400 is connected therein more stably, and the limiting force of the injection molding body 400 towards the inner side with respect to the first lamination 110a is perpendicular to the first sidewall 1113a, and the limiting force can be parallel to the radial direction of the rotation axis, and the force in the direction makes the centrifugal force limiting effect better. In particular, referring to fig. 4 or 5, in some embodiments, the first sidewall 1113a may be a straight edge in a cross section of the rectangular slot of the first slot body 1111a along a radial direction of the rotation axis; referring to fig. 6, in other embodiments, the first sidewall 1113a may be a right angle side of the triangular cross section of the first slot 1111a along a radial direction of the rotation axis.
In response to different injection molding requirements, in different embodiments, the first groove 1111a may have different shapes and structures. In particular, referring to fig. 4-6, in some embodiments, the first slot 1111a may be a polygonal slot of any shape. Specifically, in some embodiments, the first slot 1111a may be a rectangular slot. The rectangular groove can ensure that the injection molding body 400 filled in the first groove body 1111a is more firmly connected and is not easy to fall off; in some embodiments, the two side faces of the rectangular slot in the radial direction of the axis of rotation can provide a force to the first lamination 110a in the radial direction, thereby providing a better stop, such embodiments can also be seen from the above description of the radial embodiment of the first sidewall 1113a perpendicular to the axis of rotation. Further, referring to fig. 6, in some embodiments, the first groove 1111a may be a triangular groove. In addition, referring to fig. 2-3, in other embodiments, the first slot 1111a may also be an arcuate slot. Specifically, in different embodiments, the cross section of the first groove 1111a may be an arc along the radial direction of the rotation axis, and the arc may be an arc, an elliptical arc, or may be formed by multiple segments of arcs corresponding to different centers of circles. The form of the arc-shaped groove can facilitate the injection molding material to fill in the first groove body 1111a, is not easy to leave a filling gap, and facilitates the flow of the injection molding material in the first groove body 1111a, thereby being capable of improving the connection tightness and the filling uniformity of the injection molding body 400.
Based on the arrangement of the first groove 1111a, in some embodiments, a groove may be further added to form a better connection tightness enhancing effect. Specifically, referring to fig. 7, in some embodiments, the first sidewall 111a may also define a second slot 1112a. The second groove 1112a is located on a side of the first groove 1111a near the rotation axis. The second groove 1112a is used for injection molding. It is to be understood that the second groove 1112a is similar to the first groove 1111a, except that the first groove 1111a is disposed on a side of the first side wall 111a away from the rotation axis, and the second groove 1112a is disposed on a side of the first side wall 111a close to the rotation axis. Thus, in some embodiments, the second groove 1112a may have the same shape and structure as the first groove 1111a, and the different arrangement of the second groove 1112a may be referred to as the above description of the different arrangement of the first groove 1111a, which will not be repeated herein. Therefore, in some embodiments, the first side wall 111a may be provided with the first groove 1111a on a side far away from the rotation axis, and the second groove 1112a on a side close to the rotation axis, so that the area of the groove for filling the injection molding of the rotor core 10 is larger, and the binding force between the rotor core 10 and the permanent magnet 200 can be further enhanced, meanwhile, since the first groove 1111a and the second groove 1112a may be respectively disposed at two ends of the first side wall 111a in the radial direction, the limiting forces of the injection molding bodies 400 in the two grooves in the radial direction on the first lamination 110a are more balanced, so that the connection between the first lamination 110a and the injection molding body 400 is not easy to be separated from any side, and a better connection tightness enhancing effect is achieved.
Further, referring to fig. 8, in some embodiments, the first lamination 110a may also have a second sidewall 112a, and the first sidewall 111a may be disposed opposite the second sidewall 112a along a circumference of the rotational axis. It will be appreciated that the first side wall 111a and the second side wall 112a are two side wall surfaces of the first lamination 110a that are arranged opposite to each other in the circumferential direction of the rotation axis. Along the circumference of the rotation axis, the first side wall 111a can face the permanent magnets 200 of one side of the first lamination 110a, and the second side wall 112a can face the permanent magnets 200 of the other side of the first lamination 110 a. It will be appreciated that in the present embodiment, corresponding to the first side wall 111a and the second side wall 112a of the first lamination 110a which are arranged opposite to each other in the circumferential direction of the rotation axis, the first lamination 110a has two accommodation spaces in the circumferential direction of the rotation axis, and the permanent magnets 200 can be placed in both accommodation spaces, the above arrangement enables the first side wall 111a to face the permanent magnets 200 in the accommodation spaces close to the first side wall 111a, and the second side wall 112a to face the permanent magnets 200 in the accommodation spaces close to the second side wall 112a. Based on the above configuration, in some embodiments, the second sidewall 112a may define a third slot 1121a. The third slot 1121a may be spaced from the end of the second sidewall 112a near the axis of rotation. In addition, the third groove 1121a may be used for injection molding. It will be appreciated that the arrangement of the third slot 1121a is similar to the first slot 1111a described above, except that the third slot 1121a is disposed in the second side wall 112a. Thus, in some embodiments, the third slot body 1121a may be disposed opposite to the first slot body 1111a along the circumferential direction of the rotation axis, and the third slot body 1121a may have the same shape structure as the first slot body 1111a, and for the different arrangement of the third slot body 1121a, reference may be made to the above description of the different arrangement of the first slot body 1111a, which is not repeated herein.
For the embodiment in which the first lamination 110a is provided with both the first groove 1111a and the second groove 1112 a. Referring to fig. 8, in some embodiments, the first slot 1111a and the third slot 1121a may be symmetrically arranged about the first plane P. It is appreciated that in some embodiments, the shape and configuration of the first slot 1111a and the third slot 1121a may be identical and both may be symmetrically disposed about the first plane P. Wherein the axis of rotation may lie in a first plane P. It will be appreciated that, in some embodiments, the first plane P is an intermediate plane for dividing the first lamination 110a evenly, when the first slot 1111a and the third slot 1121a are symmetrically arranged about the first plane P, the design and the processing of the first lamination 110a can be more convenient, the design cost and the processing cost of the first lamination 110a can be reduced, and the injection molding body 400 filled in the first slot 1111a and the third slot 1121a can provide a more symmetrical and uniform binding force for the rotor core 10.
As is apparent from the above description of the core units, the first core unit 100a includes a plurality of laminations arranged in a stacked manner in a direction parallel to the rotational axis, including the first lamination 110a, and in some embodiments, the first core unit 100a may include other laminations, and may be combined to the above-described configuration of the first lamination 110a with respect to each of the embodiments, to form a better connection tightness enhancing effect of the rotor core 10. In particular, referring to fig. 9, in some embodiments, the first core unit 100a may further include a second lamination 120a. Similarly, the second lamination 120a may have a third sidewall 121a. The third sidewall 121a can face one side of the permanent magnet 200. It will be appreciated that in some embodiments, the configuration for the second lamination 120a may be similar to the first lamination 110a described above. Based on this, the second lamination 120a differs from the first lamination 110a in that the end of the third sidewall 121a near the rotation axis may have a first protrusion 1211a. The first projection 1211a may be used to abut an end of the permanent magnet 200 near the axis of rotation. It will be appreciated that in some embodiments, the first protrusion 1211a may be used to limit the displacement of the permanent magnet 200 near the axis of rotation. The extended structure of the first protrusion 1211a may make the magnetic energy distribution at the location uneven, so that a certain magnetic leakage phenomenon is formed between adjacent magnetic poles, thereby reducing the power density of the motor. Thus, referring to fig. 9, in some embodiments, the third sidewall 121a may not have a channel structure, or may be understood as the same minimum dimension (excluding manufacturing tolerances) from the permanent magnet 200 at various locations of the third sidewall 121a along the radial direction of the rotational axis. Based on the above arrangement, the second lamination 120a can be made to have the first projection 1211a while reducing the slot arrangement on the side wall surface, so that further reduction in motor power density can be avoided. In addition, in view of the need for enhancing the connection tightness of the rotor core 10, referring to fig. 10, in some embodiments, the third sidewall 121a may be provided with a groove structure similar to the first groove 1111a or the second groove 1112a, and in particular, reference may be made to the above-mentioned related embodiments, which are not repeated herein.
For embodiments in which the first core unit 100a includes both the first lamination 110a and the second lamination 120 a. Referring to fig. 11, in some embodiments, both ends of the first core unit 100a may be provided with one first lamination 110a in a direction parallel to the rotation axis, and at least one second lamination 120a may be located between both ends of the first core unit 100 a. It will be appreciated that the above arrangement makes the first lamination 110a and the second lamination 120a be staggered and laminated in parallel to the direction along the rotation axis, and at least one first lamination 110a is disposed at each end of the first core unit 100a, so that the slots on the first lamination 110a form injection molding channels on both sides, and the injection molding material can flow from one end to the other end of the first lamination 110a along the injection molding channels.
Further, in some embodiments, the third sidewall 121a of the second lamination 120a may include a fourth wall surface. In some embodiments, the fourth wall surface may be located at a side of the third sidewall 121a near the rotation axis, and may be located at a side of the first groove 1111a near the rotation axis. The fourth wall surface may define a fourth groove recessed in a direction away from the permanent magnet 200, the fourth groove being used for injection molding. It will be appreciated that the fourth slot is similar to the second slot 1112a described above. In some embodiments, the first lamination 110a is not provided with the second slot 1112a (it will be understood that the side of the first sidewall 111a near the axis of rotation is not provided with a slot), and the third sidewall 121a of the second lamination 120a may be correspondingly provided with a fourth slot.
Based on the stacked arrangement of the first lamination 110a and the second lamination 120a, the combination between the laminations of the first core unit 100a may form a variable injection molding passage in a direction parallel to the rotational axis, and in particular, referring to fig. 11, in some embodiments, the first core unit 100a may include a plurality of first laminations 110a in which the first slot 1111a is disposed at different positions, so that the two first laminations 110a can form an axially staggered injection molding passage.
Referring to fig. 12, the embodiment of the second aspect of the present utility model further provides a rotor assembly 300a, wherein the rotor assembly 300a includes the rotor core 10, the injection molded body 400, and the plurality of permanent magnets 200 of any of the above embodiments. Wherein, every two adjacent iron core units define accommodation space between them, are equipped with at least one permanent magnet 200 in each accommodation space respectively. Referring to fig. 12, in some embodiments, the rotor assembly 300a may include a shaft. The rotating shaft may be disposed in the middle of the rotor core 10, and an axis of the rotating shaft may coincide with the rotation axis.
In some embodiments, the rotor assembly 300a may be provided with protrusions corresponding to the slots of the rotor core 10, so that the connection tightness of the rotor core 10 may be further enhanced. Specifically, referring to fig. 13, in some embodiments, the plurality of permanent magnets 200 may include a first magnet 210 facing the first sidewall 111a. The wall surface of the first magnet 210 facing the first side wall 111a may have a second protrusion 211. The second protrusion 211 may be at least partially located within the first groove 1111a. It is understood that the first magnet 210 is located in the receiving space defined by the first sidewall 111a, and the second protrusion 211 can protrude into the first groove 1111a. In the radial direction of the rotation axis, the side of the second protrusion 211 near the rotation axis and the side far from the rotation axis may face the first groove 1111a. It is appreciated that in some embodiments, the second protrusion 211 can abut two faces of the first groove 1111a that are disposed opposite in a radial direction of the rotation axis. In some embodiments, the above arrangement enables the second protrusion 211 to abut against the first groove 1111a when the rotor core 10 or the permanent magnet 200 moves in the radial direction along the rotation axis, thereby generating an additional limit effect, and further enhancing the connection tightness of the rotor core 10. In some embodiments, the second protrusion 211 may be partially located in the first groove 1111a, and the gap between the two is filled with the injection molding body 400, so that the connection tightness of the rotor core 10 can be further improved through the dual connection limiting effect of the injection molding body 400 and the second protrusion 211.
Referring to fig. 14-16, an embodiment of the third aspect of the present utility model further provides a rotor assembly 300b, and in particular, referring to fig. 14, the rotor assembly 300b includes a plurality of permanent magnets 200, an injection molded body 400, and a rotor core 310b.
Specifically, rotor core 310b includes a plurality of core units arranged around the rotational axis of rotor core 310b. An accommodating space is defined between every two adjacent core units. The receiving space is for receiving the permanent magnet 200. One of the core units is a first core unit 311b. The first core unit 311b is disconnected from the other core units in the circumferential direction of the rotation axis. The first core unit 311b includes a plurality of laminations arranged one above the other in a direction parallel to the rotational axis, one of the laminations being the first lamination 3111b.
Referring to fig. 14-15, based on the above-described configuration, the first laminate 3111b has a first sidewall 31111b. The first sidewall 31111b faces one side of the permanent magnet 200. It will be appreciated that the arrangement of the first side wall 31111b described above is similar to the first side wall 111a in the first embodiment. Based on this, the first sidewall 31111b defines the filling space 600 together with the permanent magnet 200. It will be appreciated that the circumferentially opposite fifth side wall along the rotation axis and the wall surface of the permanent magnet 200 facing the fifth side wall can define a filling space 600 therebetween. The filling space 600 fills the injection body 400. In connection with the above embodiments, the filling space 600 may function similarly to the first slot body, and the injection molded body 400 in the filling space 600 may be capable of simultaneously connecting the rotor core 310b and the permanent magnet 200. It should be noted that, in some embodiments, the filling space 600 may be used to fill the injection molding body 400 entirely; in other embodiments, the filling space 600 may be used only partially to fill the injection molded body 400. Furthermore, in some embodiments, the grooves of the first sidewall 31111b or the grooves of the permanent magnet 200 may be used to define the fill space 600. Further, the filling space 600 includes a first gap 610 and a second gap 620. The first gap 610 is located on a side of the second gap 620 remote from the axis of rotation. It will be appreciated that the first gap 610 functions similarly to the first slot 1111a described above, and that in some embodiments the first gap 610 may be defined by a slot wall surface on a side remote from the axis of rotation. Thus, in some embodiments, the first gap 610 may be provided in a manner that refers to the first slot 1111a of the first embodiment; in other embodiments, a recess of the permanent magnet 200 may be used to define the first gap 610. In particular, the first gap 610 is larger than the second gap 620. Note that, referring to fig. 16, when the first side wall 31111b is a wall surface extending straight in the radial direction, the boundary position between the first gap 610 and the second gap 620 is a midpoint position between both ends of the first side wall 31111b in the radial direction. The above arrangement makes the volume of the injection molding body 400 in the first gap 610 larger than the volume of the injection molding body 400 in the second gap 620 (the injection molding body 400 may not be filled in the second gap 620) after the injection molding body 400 is injected into the filling space 600, and when the first lamination 3111b receives centrifugal force from the inner peripheral portion to the outer peripheral portion, the injection molding body 400 in the filling space 600 can generate a force in a direction opposite to the first lamination 3111b, thereby being beneficial to suppressing the centrifugal force and enhancing the connection tightness of the rotor core 310b.
Embodiments of the fourth aspect of the utility model also provide an electric machine comprising a rotor assembly 300a (or rotor assembly 300 b) and a stator assembly as in any of the embodiments described above.
Embodiments of the fifth aspect of the present utility model also provide a household appliance comprising the motor of any one of the embodiments described above.
Thanks to the improvement of the rotor core 10 described above, the rotor assembly 300a of the second aspect embodiment, the rotor assembly 300b of the third aspect embodiment, the motor of the fourth aspect embodiment, and the household appliance of the fifth aspect embodiment all have the same technical effects as the rotor core 10 in the above-described embodiments. And will not be described in detail herein.
The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather as utilizing equivalent structural changes made in the description and drawings of the present utility model or directly/indirectly applied to other related technical fields under the application concept of the present utility model.
Claims (14)
1. A rotor core characterized by comprising a plurality of core units arranged around a rotation axis of the rotor core, one of the core units being a first core unit which is disconnected from the other core units in a circumferential direction of the rotation axis, the first core unit comprising a plurality of laminations arranged in a stacked manner in a direction parallel to the rotation axis, one of the laminations being a first lamination;
The first lamination has a first side wall capable of facing one side of the permanent magnet, the first side wall defining a first slot spaced from an end of the first side wall proximate the axis of rotation, the first slot being for injection molding.
2. The rotor core as recited in claim 1, wherein,
the end of the first lamination remote from the rotation axis is L 1 ；
The radial dimension L of the first groove body along the rotation axis 2 The method meets the following conditions: l (L) 2 ＜0.3L 1 And/or the first groove body has a dimension L along the circumferential direction of the rotation axis 3 The method meets the following conditions: l (L) 3 ＜0.15L 1 。
3. The rotor core as recited in claim 1, wherein,
in the radial direction of the rotation axis, the end of the first lamination far away from the rotation axis is separated from the end of the first lamination close to the rotation axis by a dimension L 4 The minimum dimension L of the first slot body from the end of the first lamination close to the rotation axis 5 The method meets the following conditions: l (L) 5 ≥L 4 /2。
4. The rotor core as recited in claim 1, wherein,
the first side wall is provided with a first end face, the first end face is used for defining the first groove body, the first end face is connected to the end portion, close to the rotation axis, of the first side wall, and the first end face is perpendicular to the radial direction of the rotation axis.
5. The rotor core as recited in claim 1, wherein,
the first groove body is a rectangular groove;
or,
the first groove body is an arc groove;
or,
the first groove body is a triangular groove.
6. The rotor core as recited in claim 1, wherein,
the first side wall also defines a second slot body, the second slot body is located the first slot body be close to the axis of rotation one side, the second slot body is used for moulding plastics.
7. The rotor core as recited in claim 1, wherein,
the first lamination also has a second side wall, along the circumference of the rotation axis, the first side wall and the second side wall are arranged oppositely, along the circumference of the rotation axis, the first side wall can face the permanent magnet on one side of the first lamination, the second side wall can face the permanent magnet on the other side of the first lamination, the second side wall defines a third groove body, the third groove body is separated from the end of the second side wall, which is close to the rotation axis, and the third groove body is used for injection molding.
8. The rotor core as recited in claim 7, wherein,
the first groove body and the third groove body are symmetrically arranged about a first plane, and the rotation axis is located in the first plane.
9. The rotor core as recited in claim 1, wherein,
the first iron core unit further comprises a second lamination, the second lamination is provided with a third side wall, the third side wall can face one side of the permanent magnet, the end, close to the rotating axis, of the third side wall is provided with a first protrusion, and the first protrusion is used for abutting against one end, close to the rotating axis, of the permanent magnet;
along the direction parallel to the rotation axis, two ends of the first iron core unit are provided with one first lamination, and at least one second lamination is positioned between two ends of the first iron core unit.
10. A rotor assembly, comprising:
the rotor core of any one of claims 1-9;
an injection molding body; the method comprises the steps of,
and each accommodating space is internally provided with at least one permanent magnet.
11. The rotor assembly of claim 10 wherein the rotor assembly comprises a plurality of rotor blades,
the plurality of permanent magnets comprise first magnets facing the first side wall, the wall surface of the first magnets facing the first side wall is provided with second protrusions, the second protrusions are at least partially located in the first groove body, along the radial direction of the rotation axis, and one side, close to the rotation axis, of each second protrusion faces the first groove body, and one side, far away from the rotation axis, of each second protrusion faces the first groove body.
12. A rotor assembly, comprising:
a plurality of permanent magnets;
an injection molding body; the method comprises the steps of,
a rotor core including a plurality of core units arranged around a rotation axis of the rotor core, each adjacent two of the core units defining an accommodation space therebetween, the accommodation space being for accommodating the permanent magnet, one of the core units being a first core unit which is disconnected from the other core units in a circumferential direction of the rotation axis, the first core unit including a plurality of laminations arranged in a stacked manner in a direction parallel to the rotation axis, one of the laminations being a first lamination;
the first lamination has a first side wall facing one side of the permanent magnet, the first side wall and the permanent magnet together defining a filling space for filling the injection body, the filling space including a first gap and a second gap, the first gap being located on a side of the second gap remote from the axis of rotation, the first gap being larger than the second gap.
13. An electric machine, comprising:
the rotor assembly of any one of claims 10-12; the method comprises the steps of,
A stator assembly.
14. A household appliance, comprising:
the electric machine of claim 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322387776.0U CN220673480U (en) | 2023-09-01 | 2023-09-01 | Rotor core, rotor assembly, motor and household appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322387776.0U CN220673480U (en) | 2023-09-01 | 2023-09-01 | Rotor core, rotor assembly, motor and household appliance |
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| Publication Number | Publication Date |
|---|---|
| CN220673480U true CN220673480U (en) | 2024-03-26 |
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ID=90343782
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322387776.0U Active CN220673480U (en) | 2023-09-01 | 2023-09-01 | Rotor core, rotor assembly, motor and household appliance |
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| Country | Link |
|---|---|
| CN (1) | CN220673480U (en) |
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2023
- 2023-09-01 CN CN202322387776.0U patent/CN220673480U/en active Active
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