Rotor core, rotor assembly, motor, and home appliance
By designing alternating first and second core segments on the rotor core, combined with a limiting structure, the problem of increased magnet number and assembly difficulty in built-in permanent magnet synchronous motors was solved, achieving cost reduction and improved torque performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG WELLING ELECTRIC MACHINE MFG
- Filing Date
- 2025-09-19
- Publication Date
- 2026-08-04
AI Technical Summary
In the existing technology, the skewed pole design of the rotor of the built-in permanent magnet synchronous motor (IPM) leads to an increase in the number of magnets, higher costs, greater assembly difficulty, reduced production efficiency, and severe cogging torque and torque pulsation.
The rotor core design is adopted. The single-tooth module includes a first core segment and a second core segment that are alternately arranged along the axial direction of the rotor core. The limiting part structure design avoids the magnets from being segmented along the axial direction, realizes simple assembly, and weakens the tooth cogging torque and torque pulsation by segmented oblique poles.
The number of magnets was reduced, the assembly process was simplified, and the cost was lowered. At the same time, the cogging torque and torque pulsation were reduced, vibration noise was suppressed, and the torque performance of the motor was improved.
Smart Images
Figure CN224596236U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology, and in particular to a rotor core, rotor assembly, motor and household appliance. Background Technology
[0002] To improve the torque characteristics of permanent magnet synchronous motors (IPMs), i.e., to reduce cogging torque and torque ripple, stator skew or rotor skew is often employed. In existing technologies, to achieve skewed rotor design in integrated permanent magnet synchronous motors (IPMs), segmented rotor skew is often used, with magnets inserted into each segment of the rotor core. The drawback is that the number of magnets increases exponentially with the number of segments, leading to increased manufacturing costs and motor costs. It also increases the difficulty of rotor assembly and reduces the production efficiency of large-scale motor manufacturing. Utility Model Content
[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a rotor core that, on the one hand, avoids segmenting the magnets along the axial direction of the rotor core, simplifying assembly and reducing costs; on the other hand, it achieves the technical effect of segmented skewed poles in rotor assemblies, weakening cogging torque and torque pulsation, and suppressing vibration noise.
[0004] This utility model also proposes a rotor assembly, including the aforementioned rotor core.
[0005] This utility model also proposes an electric motor, including the rotor assembly described above.
[0006] This utility model also proposes a household appliance, including the aforementioned motor.
[0007] According to an embodiment of the present invention, a rotor core includes: a single-tooth module, wherein a plurality of single-tooth modules are spaced apart along the circumferential direction of the rotor core, and a magnetic slot is defined between two adjacent single-tooth modules. Each single-tooth module includes a first core segment and a second core segment arranged alternately along the axial direction of the rotor core. The first core segment and the second core segment have a first limiting portion and a second limiting portion at their radially outer ends on both sides along the circumferential direction of the rotor core, respectively. Along the circumferential direction of the rotor core, the length of the first limiting portion is greater than the length of the second limiting portion. The first limiting portion of the first core segment and the second limiting portion of the second core segment are arranged opposite to each other along the axial direction of the rotor core. The second limiting portion of the first core segment and the first limiting portion of the second core segment are also arranged opposite to each other along the axial direction of the rotor core.
[0008] According to an embodiment of this utility model, the rotor core defines a magnet slot between two adjacent single-tooth modules. Each single-tooth module includes a first core segment and a second core segment arranged alternately along the axial direction of the rotor core. The first and second core segments have a first limiting portion and a second limiting portion at their radially outer ends on both sides along the circumferential direction of the rotor core, respectively. Along the circumferential direction of the rotor core, the length of the first limiting portion is greater than the length of the second limiting portion. The first limiting portion of the first core segment and the second limiting portion of the second core segment are arranged opposite each other along the axial direction of the rotor core. This arrangement avoids segmenting the magnet along the axial direction of the rotor core, simplifying assembly and reducing costs. Furthermore, it achieves the technical effect of segmented skewed poles in the rotor assembly, weakening cogging torque and torque pulsation, and suppressing vibration and noise.
[0009] In some embodiments of this utility model, at least one of the two side walls of the magnet slot opposite each other along the circumferential direction of the rotor core is a plane parallel to the axis of the rotor core.
[0010] In some embodiments of this utility model, the first core segment and the second core segment have the same structure.
[0011] In some embodiments of this utility model, within the same cross-section perpendicular to the rotor core axis, the first limiting portions of a plurality of first core segments are all disposed on the same side of the first core segment along the circumferential direction of the rotor core, and the second limiting portions of a plurality of first core segments are all disposed on the same side of the first core segment along the circumferential direction of the rotor core; and / or, within the same cross-section perpendicular to the rotor core axis, the first limiting portions of a plurality of second core segments are all disposed on the same side of the second core segment along the circumferential direction of the rotor core, and the second limiting portions of a plurality of second core segments are all disposed on the same side of the second core segment along the circumferential direction of the rotor core.
[0012] In some embodiments of this utility model, there are 2p single-tooth modules. In the projection onto a plane perpendicular to the rotor core axis, within the same first or second core segment, the angle between the line connecting the point of the first limiting part furthest from the second limiting part to the center of the rotor core and the centerline of the single-tooth module is C2, and C1 and C2 satisfy: .
[0013] In some embodiments of this utility model, there are 2p single-tooth modules. In the projection onto a plane perpendicular to the rotor core axis, within the same first or second core segment, the angle between the line connecting the point of the second limiting part furthest from the first limiting part and the center of the rotor core, and the centerline of the single-tooth module, is C3. C1 and C3 satisfy the following: .
[0014] The rotor assembly according to an embodiment of the present utility model includes: the rotor core described above; magnets, wherein there are multiple magnets, and the multiple magnets are respectively disposed in multiple magnet slots.
[0015] According to the rotor assembly of this utility model embodiment, by setting the aforementioned rotor core, a magnet slot is defined between two adjacent single-tooth modules. Each single-tooth module includes a first core segment and a second core segment alternately arranged along the axial direction of the rotor core. The first and second core segments have a first limiting portion and a second limiting portion at their radially outer ends on both sides along the circumferential direction of the rotor core, respectively. Along the circumferential direction of the rotor core, the length of the first limiting portion is greater than the length of the second limiting portion. The first limiting portion of the first core segment and the second limiting portion of the second core segment are arranged opposite each other along the axial direction of the rotor core. This arrangement avoids segmenting the magnet along the axial direction of the rotor core, simplifying assembly and reducing costs. Furthermore, it achieves the technical effect of segmented skewed poles in the rotor assembly, weakening cogging torque and torque pulsation, and suppressing vibration and noise.
[0016] In some embodiments of this utility model, the magnet is a single piece.
[0017] The motor according to an embodiment of the present invention includes the rotor assembly described above.
[0018] According to the embodiment of the present invention, the motor, by setting the above-mentioned rotor assembly and rotor core, defines a magnet slot between two adjacent single-tooth modules. Each single-tooth module includes a first core segment and a second core segment arranged alternately along the axial direction of the rotor core. The first and second core segments have a first limiting portion and a second limiting portion at their radially outer ends on both sides along the circumferential direction of the rotor core, respectively. Along the circumferential direction of the rotor core, the length of the first limiting portion is greater than the length of the second limiting portion. The first limiting portion of the first core segment and the second limiting portion of the second core segment are arranged opposite each other along the axial direction of the rotor core. This arrangement avoids segmenting the magnet along the axial direction of the rotor core, simplifying assembly and reducing costs. Furthermore, it achieves the technical effect of segmented skewed poles in the rotor assembly, weakening cogging torque and torque pulsation, and suppressing vibration and noise.
[0019] The household appliance according to the present invention includes the motor described above.
[0020] According to the embodiments of the present invention, the household appliance is equipped with the aforementioned motor, rotor assembly, and rotor core. A magnetic slot is defined between two adjacent single-tooth modules. Each single-tooth module includes a first core segment and a second core segment arranged alternately along the axial direction of the rotor core. The first and second core segments have a first limiting portion and a second limiting portion at their radially outer ends on both sides along the circumferential direction of the rotor core, respectively. Along the circumferential direction of the rotor core, the length of the first limiting portion is greater than the length of the second limiting portion. The first limiting portion of the first core segment and the second limiting portion of the second core segment are arranged opposite each other along the axial direction of the rotor core. This arrangement avoids segmenting the magnet along the axial direction of the rotor core, simplifying assembly and reducing costs. Furthermore, it achieves the technical effect of segmented skewed poles in the rotor assembly, weakening cogging torque and torque pulsation, and suppressing vibration and noise.
[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is an exploded view of the rotor assembly according to an embodiment of the present utility model; Figure 2 This is a perspective view of a single-tooth module of a rotor core according to an embodiment of the present utility model; Figure 3 This is a perspective view of the second core segment of a single-tooth module of a rotor core according to an embodiment of the present utility model; Figure 4 This is a front view of the second core segment of a single-tooth module of a rotor core according to an embodiment of the present utility model; Figure 5 This is a comparison diagram between the cogging torque of the motor according to the embodiment of the present invention and the cogging torque of the motor in the conventional solution. Figure 6 This is a comparison diagram between the torque pulsation of a motor according to an embodiment of the present invention and the torque pulsation of a motor according to a conventional solution.
[0023] Figure label: 100. Rotor assembly; 10. Rotor core; 1. Single-tooth module; 11. First core segment; 111. First rotor lamination; 12. Second core segment; 121. Second rotor lamination; 13. First limiting part; 14. Second limiting part; 2. Magnet; 3. Magnetic steel channel. Detailed Implementation
[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0026] The following is for reference. Figures 1-4 The rotor core 10 according to an embodiment of the present invention is described.
[0027] like Figures 1-4 As shown, the rotor core 10 according to an embodiment of the present invention includes: a single-tooth module 1.
[0028] Specifically, refer to Figures 1-2The single-tooth module 1 consists of multiple modules spaced apart along the circumferential direction of the rotor core 10. A magnetic slot 3 is defined between two adjacent single-tooth modules 1. The single-tooth module 1 includes a first core segment 11 and a second core segment 12 arranged alternately along the axial direction of the rotor core 10. It should be noted that only one magnetic slot 3 is defined between two adjacent single-tooth modules 1, so that the magnet 2 is a whole along the axial direction of the rotor core 10 and can be directly embedded in the magnetic slot 3. This avoids the magnet 2 being segmented along the axial direction of the rotor core 10, which simplifies assembly and reduces costs.
[0029] Furthermore, such as Figures 1-4 As shown, the first core segment 11 and the second core segment 12 have a first limiting portion 13 and a second limiting portion 14 at their radially outer ends on both sides of the rotor core 10 along the circumferential direction. Specifically, the first core segment 11 has a first limiting portion 13 and a second limiting portion 14 at its radially outer ends on both sides of the rotor core 10 along the circumferential direction, and the second core segment 12 also has a first limiting portion 13 and a second limiting portion 14 at its radially outer ends on both sides of the rotor core 10 along the circumferential direction. Along the circumferential direction of the rotor core 10, the length of the first limiting portion 13 is greater than the length of the second limiting portion 14. The first limiting portion 13 of the first core segment 11 and the second limiting portion 14 of the second core segment 12 are arranged opposite each other along the axial direction of the rotor core 10, and the second limiting portion 14 of the first core segment 11 and the first limiting portion 13 of the second core segment 12 are also arranged opposite each other along the axial direction of the rotor core 10.
[0030] It is understandable that, since the first core segment 11 and the second core segment 12 are arranged alternately along the axial direction of the rotor core 10, the first limiting part 13 of the first core segment 11 and the second limiting part 14 of the second core segment 12 are arranged opposite each other along the axial direction of the rotor core 10, and the second limiting part 14 of the first core segment 11 and the first limiting part 13 of the second core segment 12 are arranged opposite each other along the axial direction of the rotor core 10, so that in the projection perpendicular to the axis of the rotor core 10, the first core segment 11 and the second core segment 12 do not overlap, thereby achieving the technical effect of segmented skew poles of the rotor assembly 100, reducing cogging torque and torque pulsation, and suppressing vibration noise.
[0031] The following is for reference. Figure 5 and Figure 6 The technical effect of segmented skew poles formed by alternating arrangement of the first core segment 11 and the second core segment 12 along the axial direction of the rotor core 10 is described. The conventional solution refers to the case where the first core segment 11 and the second core segment 12 coincide in the projection perpendicular to the axis of the rotor core 10.
[0032] For example in Figure 5As shown in the chart, the cogging torque of the motor of this invention is 12.9 mNm, while the cogging torque of the motor of the conventional solution is 22.3 mNm. Therefore, the torque performance of the motor of this invention is better than that of the conventional motor, and the cogging torque is reduced by 42.2%.
[0033] For example in Figure 6 As shown in the chart, the torque ripple of the motor of this invention is 1.87%, while the cogging torque of the motor of the traditional solution is 2.50%. Therefore, the torque performance of the motor of this invention is better than that of the traditional motor, and the torque ripple is reduced by 25.2%.
[0034] Furthermore, such as Figures 1-2 As shown, in the same single-tooth module 1, the first core segment 11 and the second core segment 12 are multiple units arranged along the axial direction of the rotor core 10. This further improves the technical effect of the segmented skew pole of the rotor assembly 100, further reduces the cogging torque and torque pulsation, and suppresses vibration noise.
[0035] In summary, the rotor core 10 of this invention avoids the need for segmentation of the magnet 2 along the axial direction of the rotor core 10, simplifying assembly and reducing costs. Furthermore, it achieves the same effect as the segmented skewed pole design of the rotor assembly 100, reducing cogging torque and torque pulsation, and suppressing vibration and noise.
[0036] Furthermore, such as Figure 1 and Figure 2 As shown, the first core segment 11 includes a plurality of first rotor laminations 111 arranged along the axial direction of the rotor core 10. The radially outer ends of the first rotor laminations 111 along the circumferential direction of the rotor core 10 have a first sub-limiting portion and a second sub-limiting portion, respectively. The first sub-limiting portions of the plurality of first rotor laminations 111 constitute the first limiting portion 13 of the first core segment 11, and the second sub-limiting portions of the plurality of first rotor laminations 111 constitute the second limiting portion 14 of the first core segment 11. In the projection in the direction perpendicular to the axis of the rotor core 10, the first sub-limiting portions of the plurality of first rotor laminations 111 coincide, and the second sub-limiting portions of the plurality of first rotor laminations 111 coincide.
[0037] Furthermore, such as Figure 1 and Figure 2As shown, the second core segment 12 includes a plurality of second rotor laminations 121 arranged along the axial direction of the rotor core 10. The radially outer ends of the second rotor laminations 121 along the circumferential direction of the rotor core 10 have a first sub-limiting portion and a second sub-limiting portion, respectively. The first sub-limiting portions of the plurality of second rotor laminations 121 constitute the first limiting portion 13 of the second core segment 12, and the second sub-limiting portions of the plurality of second rotor laminations 121 constitute the second limiting portion 14 of the second core segment 12. In the projection in the direction perpendicular to the axis of the rotor core 10, the first sub-limiting portions of the plurality of second rotor laminations 121 coincide, and the second sub-limiting portions of the plurality of second rotor laminations 121 coincide.
[0038] According to the embodiment of the present invention, the rotor core 10 is defined by defining a magnet slot 3 between two adjacent single-tooth modules 1. The single-tooth module 1 includes a first core segment 11 and a second core segment 12 arranged alternately along the axial direction of the rotor core 10. The radially outer ends of the first core segment 11 and the second core segment 12 along the circumferential direction of the rotor core 10 respectively have a first limiting part 13 and a second limiting part 14. Along the circumferential direction of the rotor core 10, the length of the first limiting part 13 is greater than the length of the second limiting part 14. The first limiting part 13 of the first core segment 11 and the second limiting part 14 of the second core segment 12 are arranged opposite to each other along the axial direction of the rotor core 10. The second limiting part 14 of the first core segment 11 and the first limiting part 13 of the second core segment 12 are arranged opposite to each other along the axial direction of the rotor core 10. On the one hand, this avoids the magnet 2 being segmented along the axial direction of the rotor core 10, simplifies assembly, and reduces costs. On the other hand, it can achieve the technical effect of 100-segment skewed poles in rotor assembly, which reduces cogging torque and torque pulsation, and suppresses vibration and noise.
[0039] In some embodiments of this utility model, such as Figures 1-4 As shown, at least one of the two opposing side walls of the magnet slot 3 along the circumferential direction of the rotor core 10 is a plane parallel to the axis of the rotor core 10. Since both opposing side walls of the magnet slot 3 along the circumferential direction of the rotor core 10 are continuous planes parallel to the axis of the rotor core 10, the magnet 2 can be a regular cuboid, further simplifying assembly and manufacturing, and further reducing costs.
[0040] In some embodiments of this utility model, such as Figures 1-4 As shown, the first core segment 11 and the second core segment 12 have the same structure. Therefore, the first core segment 11 and the second core segment 12 can share a single mold for development and manufacturing, further reducing manufacturing costs. The second core segment 12 passes through the first core segment 11 around the centerline of the single-tooth module 1 (e.g., ...). Figure 4The L-line shown can be obtained by rotating it 180°. Furthermore, since the first core segment 11 and the second core segment 12 have the same structure, they can be better aligned during assembly, facilitating assembly.
[0041] In some embodiments of this utility model, such as Figures 1-4 As shown, in the same cross section perpendicular to the axis of the rotor core 10, the first limiting parts 13 of multiple first core segments 11 are all provided on the same side of the first core segment 11 along the circumferential direction of the rotor core 10, and the second limiting parts 14 of multiple first core segments 11 are all provided on the same side of the first core segment 11 along the circumferential direction of the rotor core 10; thereby, the assembly efficiency is further improved.
[0042] For example Figure 1 and Figure 2 As shown, the two directions along the circumferential direction of the rotor core are the first direction (e.g., Figure 2 (as shown in direction a) and the second direction (as shown in direction a) Figure 2 As shown in direction b), in the same cross section perpendicular to the axis of the rotor core 10, the first limiting parts 13 of multiple first core segments 11 are all provided on the side of the first core segment 11 facing the first direction, and the second limiting parts 14 of multiple first core segments 11 are all provided on the side of the first core segment 11 facing the second direction.
[0043] In some embodiments of this utility model, such as Figures 1-4 As shown, within the same cross-section perpendicular to the axis of the rotor core 10, the first limiting portions 13 of multiple second core segments 12 are all located on the same side of the second core segments 12 along the circumferential direction of the rotor core 10, and the second limiting portions 14 of multiple second core segments 12 are all located on the same side of the second core segments 12 along the circumferential direction of the rotor core 10. This further improves assembly efficiency.
[0044] For example Figure 1 and Figure 2 As shown, the two directions along the circumferential direction of the rotor core are the first direction (e.g., Figure 2 (as shown in direction a) and the second direction (as shown in direction a) Figure 2 As shown in direction b), in the same cross section perpendicular to the axis of the rotor core 10, the second limiting parts 14 of multiple second core segments 12 are all provided on the side of the first core segment 11 facing the first direction, and the first limiting parts 13 of multiple second core segments 12 are all provided on the side of the first core segment 11 facing the second direction.
[0045] In some embodiments of this utility model, such as Figure 4 As shown, there are 2p single-tooth modules. In the projection onto a plane perpendicular to the axis of the rotor core 10, within the same first core segment 11 or second core segment 12, the line connecting the point of the first limiting part 13 furthest from the second limiting part 14 to the center of the rotor core 10 and the center line of the single-tooth module 1 (e.g.) Figure 4 The angle between the L-lines shown is C2, and C1 and C2 satisfy: For example, it can be 0.8, 0.81, 0.815 or 0.82, etc.
[0046] It is understandable that by limiting the angle between the line connecting the farthest end of the first limiting part 13 away from the second limiting part 14 and the center of the rotor core 10 and the center line of the single tooth module 1, the length of the first limiting part 13 along the circumferential direction of the rotor core 10 is limited, thereby obtaining a suitable polar arc coefficient, further reducing cogging torque and torque pulsation, and suppressing vibration noise.
[0047] In some embodiments of this utility model, such as Figure 4 As shown, there are 2p single-tooth modules. In the projection onto a plane perpendicular to the axis of the rotor core 10, within the same first core segment 11 or second core segment 12, the line connecting the point of the second limiting part 14 furthest from the first limiting part 13 to the center of the rotor core 10 and the center line of the single-tooth module 1 (e.g.) Figure 4 The included angle between the L-lines shown is C3, and C1 and C3 satisfy: For example, it can be 0.66, 0.67, 0.675 or 0.68.
[0048] It is understandable that by limiting the angle between the line connecting the end of the second limiting part 14 furthest from the first limiting part 13 and the center of the rotor core 10 and the center line of the single tooth module 1, the length of the second limiting part 14 along the circumferential direction of the rotor core 10 is limited, thereby obtaining a suitable polar arc coefficient, further reducing cogging torque and torque pulsation, and suppressing vibration noise.
[0049] The following is for reference. Figure 1 The rotor assembly 100 according to an embodiment of the present utility model is described.
[0050] like Figure 1 As shown, the rotor assembly 100 according to an embodiment of the present invention includes: the aforementioned rotor core 10 and magnets 2. Multiple magnets 2 are disposed in multiple corresponding magnet slots 3. This constitutes the rotor assembly 100 of the present invention. It should be noted that only one magnet slot 3 is defined between two adjacent single-tooth modules 1, thus making the magnets 2 a single piece along the axial direction of the rotor core 10, which can be directly embedded into the magnet slot 3. This avoids segmentation of the magnets 2 along the axial direction of the rotor core 10, simplifying assembly and reducing costs.
[0051] According to the rotor assembly 100 of this utility model embodiment, by setting the rotor core 10 as described above, a magnet slot 3 is defined between two adjacent single-tooth modules 1. The single-tooth module 1 includes a first core segment 11 and a second core segment 12 arranged alternately along the axial direction of the rotor core 10. The radially outer ends of the first core segment 11 and the second core segment 12 along the circumferential direction of the rotor core 10 respectively have a first limiting part 13 and a second limiting part 14. Along the circumferential direction of the rotor core 10, the length of the first limiting part 13 is greater than the length of the second limiting part 14. The first limiting part 13 of the first core segment 11 and the second limiting part 14 of the second core segment 12 are arranged opposite to each other along the axial direction of the rotor core 10. The second limiting part 14 of the first core segment 11 and the first limiting part 13 of the second core segment 12 are arranged opposite to each other along the axial direction of the rotor core 10. On the one hand, this avoids the magnet 2 being segmented along the axial direction of the rotor core 10, simplifies assembly, and reduces costs. On the other hand, it can achieve the technical effect of 100-segment skewed poles in rotor assembly, which reduces cogging torque and torque pulsation, and suppresses vibration and noise.
[0052] In some embodiments of this utility model, such as Figure 1 As shown, the magnet 2 is a single piece. This makes the magnet 2 a single unit along the axial direction of the rotor core 10, which can be directly embedded into the magnet slot 3, avoiding the need for the magnet 2 to be segmented along the axial direction of the rotor core 10, simplifying assembly and reducing manufacturing costs.
[0053] The following describes a motor according to an embodiment of the present invention.
[0054] The motor according to the present invention includes the rotor assembly 100 described above. Additionally, the motor also includes a stator, which includes a stator core. The stator core includes a yoke and a plurality of teeth. The plurality of teeth are disposed on the inner peripheral wall of the yoke and spaced apart along the circumferential direction of the yoke, with a stator slot defined between adjacent teeth. The rotor assembly 100 is rotatably disposed within the stator core.
[0055] According to the embodiment of the present invention, the motor is equipped with the rotor assembly 100 and the rotor core 10. A magnet slot 3 is defined between two adjacent single-tooth modules 1. The single-tooth module 1 includes a first core segment 11 and a second core segment 12 arranged alternately along the axial direction of the rotor core 10. The radially outer ends of the first core segment 11 and the second core segment 12 along the circumferential direction of the rotor core 10 have a first limiting part 13 and a second limiting part 14, respectively. Along the circumferential direction of the rotor core 10, the length of the first limiting part 13 is greater than the length of the second limiting part 14. The first limiting part 13 of the first core segment 11 and the second limiting part 14 of the second core segment 12 are arranged opposite to each other along the axial direction of the rotor core 10. The second limiting part 14 of the first core segment 11 and the first limiting part 13 of the second core segment 12 are arranged opposite to each other along the axial direction of the rotor core 10. On the one hand, this avoids the magnet 2 being segmented along the axial direction of the rotor core 10, simplifies assembly, and reduces costs. On the other hand, it can achieve the technical effect of 100-segment skewed poles in rotor assembly, which reduces cogging torque and torque pulsation, and suppresses vibration and noise.
[0056] The following describes a household appliance according to an embodiment of the present invention.
[0057] The household appliance according to the present invention includes the motor described above.
[0058] According to the embodiments of the present invention, the household appliance is equipped with the aforementioned motor, rotor assembly 100, and rotor core 10. A magnet slot 3 is defined between two adjacent single-tooth modules 1. The single-tooth module 1 includes a first core segment 11 and a second core segment 12 arranged alternately along the axial direction of the rotor core 10. The radially outer ends of the first core segment 11 and the second core segment 12 along the circumferential direction of the rotor core 10 respectively have a first limiting part 13 and a second limiting part 14. Along the circumferential direction of the rotor core 10, the length of the first limiting part 13 is greater than the length of the second limiting part 14. The first limiting part 13 of the first core segment 11 and the second limiting part 14 of the second core segment 12 are arranged opposite to each other along the axial direction of the rotor core 10. The second limiting part 14 of the first core segment 11 and the first limiting part 13 of the second core segment 12 are arranged opposite to each other along the axial direction of the rotor core 10. On the one hand, this avoids the magnet 2 being segmented along the axial direction of the rotor core 10, simplifying assembly and reducing costs. On the other hand, it can achieve the technical effect of 100-segment skewed poles in rotor assembly, which reduces cogging torque and torque pulsation, and suppresses vibration and noise.
[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0060] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A rotor core, characterized in that, include: The single-tooth module comprises multiple single-tooth modules spaced apart along the circumferential direction of the rotor core. A magnetic slot is defined between adjacent single-tooth modules. Each single-tooth module includes a first core segment and a second core segment arranged alternately along the axial direction of the rotor core. The first and second core segments have a first limiting portion and a second limiting portion at their radially outer ends on both sides along the circumferential direction of the rotor core, respectively. Along the circumferential direction of the rotor core, the length of the first limiting portion is greater than the length of the second limiting portion. The first limiting portion of the first iron core segment and the second limiting portion of the second iron core segment are arranged opposite to each other along the axial direction of the rotor iron core.
2. The rotor core according to claim 1, characterized in that, At least one of the two side walls of the magnet slot, which are opposite each other along the circumferential direction of the rotor core, is a plane parallel to the axis of the rotor core.
3. The rotor core according to claim 1, characterized in that, The first core segment and the second core segment have the same structure.
4. The rotor core according to claim 1, characterized in that, Within the same cross section perpendicular to the rotor core axis, the first limiting portions of multiple first core segments are all located on the same side of the first core segment along the circumferential direction of the rotor core, and the second limiting portions of multiple first core segments are all located on the same side of the first core segment along the circumferential direction of the rotor core. And / or, within the same cross-section perpendicular to the rotor core axis, the first limiting portions of a plurality of second core segments are all located on the same side of the second core segment along the circumferential direction of the rotor core, and the second limiting portions of a plurality of second core segments are all located on the same side of the second core segment along the circumferential direction of the rotor core.
5. The rotor core according to claim 1, characterized in that, There are 2p single-tooth modules. In the projection onto a plane perpendicular to the rotor core axis, within the same first or second core segment, the angle between the line connecting the point of the first limiting part furthest from the second limiting part to the center of the rotor core and the centerline of the single-tooth module is C2, and C1 and C2 satisfy: .
6. The rotor core according to claim 1, characterized in that, There are 2p single-tooth modules. In the projection onto a plane perpendicular to the rotor core axis, within the same first or second core segment, the angle between the line connecting the point of the second limiting part furthest from the first limiting part and the center of the rotor core, and the centerline of the single-tooth module, is C3. C1 and C3 satisfy the following: .
7. A rotor assembly, characterized in that, include: Rotor core according to any one of claims 1-6; The magnets are multiple, and each magnet is disposed in a corresponding magnetic groove.
8. The rotor assembly according to claim 7, characterized in that, The magnet is a single piece.
9. An electric motor, characterized in that, Includes the rotor assembly as described in claim 7 or 8.
10. A household appliance, characterized in that, Includes the motor according to claim 9.