Segmented laminated core, method for manufacturing the same, and rotary electric machine

Abstract

The application discloses a split type laminated iron core and a manufacturing method thereof and a rotating electrical machine, which has a plurality of split sheet laminated bodies connected with each other in the circumferential direction, and the split sheet laminated body at least comprises a first type of iron core sheet and a second type of iron core sheet; wherein the surface of the first type of iron core sheet is formed with a first buckling point, and the surface of the second type of iron core sheet is formed with a through hole corresponding to the position of the first buckling point; the first buckling point of the first type of iron core sheet is configured to pass through the through hole of the second type of iron core sheet to cooperate with the first buckling point of another first type of iron core sheet adjacent to the first type of iron core sheet, thereby forming a first riveting structure of the split sheet laminated body; the surface of the first type of iron core sheet and the surface of the second type of iron core sheet are both formed with a second buckling point, and the first type of iron core sheet and the second type of iron core sheet are cooperated through the second buckling point, thereby forming a second riveting structure of the split sheet laminated body. Through the double riveting structure design, the internal connection strength and the integrity of the split sheet laminated body are improved.

Description

Technical Field

[0001] This invention relates to the field of motor core manufacturing technology, specifically to a segmented laminated core and its manufacturing method, and a rotary motor. Background Technology

[0002] Segmented laminated iron cores are widely used in power equipment such as motors and transformers. They are constructed by stacking several segmented iron core sheets and connecting them using a snap-fit ​​structure to ensure the strength of the interlayer connections and the stability of magnetic properties. Currently, the main technical solutions include: (1) Conventional inclined snap-fit ​​structure: Inclined snap-fit ​​points are formed by stretching and deforming the iron chip, and the snap-fit ​​points of adjacent iron chips interlock to achieve connection. However, in this structure, the inclined surfaces of two adjacent snap-fit ​​points are prone to interference (e.g. Figure 1 (as shown in shaded area a) This results in large gaps between layers, severely reducing the core's stacking coefficient and failing to meet the requirements of high-performance equipment for uniform magnetic circuitry in the core.

[0003] (2) Alternating structure of snap-in point and through piece: In order to solve the problem of interference on the inclined plane, some processes adopt the method of alternating stacking of snap-in point pieces and through pieces at the same snap-in point position (e.g. Figure 1 (As shown in b), a gap is formed between the inclined surfaces of the snap-fit ​​points using a through-plate to avoid interference. However, this scheme significantly reduces the effective contact area between the snap-fit ​​points and the interlayer tensile strength of a single snap-fit ​​point, making it difficult to meet the connection strength requirements of high-performance iron cores.

[0004] Existing snap-fit ​​technology generally suffers from the core contradiction of balancing connection strength and overlap coefficient; therefore, it is necessary to provide a new method to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a segmented laminated iron core and its manufacturing method, as well as a rotary motor, which improves the internal connection strength and integrity of the segmented laminated body through a double-overlap riveting structure design.

[0006] The technical solution of this invention is summarized as follows: The first objective of this invention is to provide a segmented laminated iron core having a plurality of segmented laminates connected to each other in the circumferential direction, each of the segmented laminates being provided with at least two types of riveting structures. The segmented laminated body includes at least a first type of iron core laminate and a second type of iron core laminate; wherein... The first type of iron core lamination has a first snap point formed on its surface, and the second type of iron core lamination has a through hole corresponding to the position of the first snap point. The first snap point of the first type of iron core lamination is configured to pass through the through hole of the second type of iron core lamination to cooperate with the first snap point of another adjacent first type of iron core lamination to form the first riveting structure of the segmented lamination. Both the first type of iron core lamination and the second type of iron core lamination have second fastening points on their surfaces. The first type of iron core lamination and the second type of iron core lamination cooperate through the second fastening points to form the second riveting structure of the segmented lamination.

[0007] Preferably, one or more of the second deduction points are provided.

[0008] Preferably, both the first type of iron core lamination and the second type of iron core lamination include a yoke and a toothed portion, and the second fastening point is disposed on the yoke and / or the toothed portion.

[0009] Preferably, at least one of the first fastening points / through holes is located in the yoke portion, and at least one of the first fastening points / through holes is located in the tooth portion.

[0010] Preferably, the second fastening point is located within a triangular area enclosed by the three first fastening points / through holes.

[0011] Preferably, the second buckle point is located at the centroid of the triangular region.

[0012] Preferably, the depth of the second snap point is 0.2-2 times the thickness of the first type of iron core lamination and the second type of iron core lamination.

[0013] Preferably, the second fastening point is a cylindrical fastening point structure, a "V" shaped fastening point structure, or a trapezoidal fastening point structure; the cross-section of the second fastening point is any one of a circle, a square, or a polygon.

[0014] Preferably, when the cross-section of the second snap point is circular, the ratio of the depth of the second snap point to the diameter of the second snap point is 0.05-0.3.

[0015] A second objective of this invention is to provide a method for manufacturing a segmented laminated iron core, which, as described above, comprises at least the following steps: a) Stamping to obtain a first type of iron core lamination, wherein the first type of iron core lamination is punched with a first buckle point protruding from the surface, and a second buckle point is punched on the first type of iron core lamination; b) Stamping to obtain a second type of iron core lamination, wherein the second type of iron core lamination is punched with through holes for the first fastening point to pass through, and a second fastening point is punched on the second type of iron core lamination; c) The first type of iron core lamination and the second type of iron core lamination are stacked in sequence to form a segmented lamination body, wherein two adjacent first type iron core laminations are fastened by a first fastening point, and adjacent first type iron core laminations and second type iron core laminations are fastened by a second fastening point.

[0016] Preferably, the method further includes the step of: selectively stamping the first type of iron core lamination and / or the second type of iron core lamination on the iron core strip by independently controlling the stamping action of the first snap-on punch, the second snap-on punch, and the through-hole punch.

[0017] A third object of the present invention is to provide a rotary electric motor comprising a segmented laminated iron core as described above.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a segmented laminated iron core and its manufacturing method, as well as a rotary motor. Through a double-overlap riveting structure design, the internal connection strength and integrity of the segmented laminated body are improved. Specifically, the first riveting structure uses a first snap point and through-hole matching method, allowing the first snap point of the first type of iron core laminate to pass through the through-hole of the second type of iron core laminate and match the first snap point of the adjacent first type of iron core laminate. This completely avoids the interference problem of adjacent snap point slopes in conventional sloped snap points, eliminating gaps caused by interference between layers. Based on the first riveting structure, a second riveting structure is added. Through the mutual matching of the second snap points on the surfaces of the first and second types of iron core laminates, interlayer connection reinforcement points are formed, significantly increasing the effective contact area and significantly improving shear resistance and interlayer tensile force. This achieves simultaneous optimization of the connection strength and stacking coefficient of the segmented laminated iron core.

[0019] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This refers to the existing lamination technology for iron core laminations; Figure 2 This is a schematic diagram of the structure of the segmented laminate in an embodiment of the present invention; Figure 3 for Figure 2 Enlarged view of point A; Figure 4 for Figure 2 Enlarged view of point B; Figure 5 This is the stacking method of the segmented sheet stack in the embodiments of the present invention; Figure 6 This is a schematic diagram of the structure of the iron core laminations in an embodiment of the present invention; Figure 7a This is a schematic diagram of the second fastening point being arranged on the teeth in an embodiment of the present invention; Figure 7b This is a schematic diagram of the second fastening point being arranged on the yoke in an embodiment of the present invention; Figure 7c This is a schematic diagram showing the second fastening point arranged on the tooth and yoke in an embodiment of the present invention; Figure 8 This is a schematic diagram showing the second fastening point located at the root of the tooth in an embodiment of the present invention; Figure 9 This is a schematic diagram showing that the second fastening point is set within the triangular area formed by the three first fastening points in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the second fastening point in an embodiment of the present invention; Figure 11 This is a schematic diagram showing the iron core strip passing through each station in sequence in an embodiment of the present invention.

[0021] In the diagram: 1. Segmented laminated iron core; 10. Segmented laminated body; 2. Iron core strip; 10a. First type of iron core lamination; 10b. Second type of iron core lamination; 10c. Third type of iron core lamination; 101. Yoke; 102. Tooth; 11. First fastening point; 12. Second fastening point; 13. Through hole. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the accompanying drawings, shapes and dimensions may be enlarged for clarity, and the same reference numerals will be used in all figures to indicate the same or similar parts.

[0024] In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, and lower are defined relative to the structure shown in the accompanying drawings. In particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back. These are relative concepts and may vary depending on their location and usage. Therefore, these or other orientations should not be interpreted as restrictive terms.

[0025] Terms involving attachment, connection, etc. (e.g., “connection” and “attachment”) refer to the relationship in which these structures are directly or indirectly fixed or attached to each other through an intermediate structure, as well as movable or rigid attachments or relationships, unless otherwise explicitly stated.

[0026] Example 1 This invention provides a segmented laminated iron core 1, which has a plurality of segmented laminated bodies 10 connected to each other in the circumferential direction. Each segmented laminated body 10 is provided with at least two types of riveting structures. The segmented laminated body 10 includes at least a first type of iron core lamination 10a and a second type of iron core lamination 10b. The invention also incorporates... Figures 2-10 As shown: The surface of the first type of iron core lamination 10a has a first fastening point 11, and the surface of the second type of iron core lamination 10b has a through hole 13 corresponding to the position of the first fastening point 11; the first fastening point 11 of the first type of iron core lamination 10a is configured to pass through the through hole 13 of the second type of iron core lamination 11b to cooperate with the first fastening point 11 of another adjacent first type of iron core lamination 10a to form the first riveting structure of the segmented lamination 10; The first type of iron core lamination 10a and the second type of iron core lamination 10b both have second fastening points 12 formed on their surfaces. The first type of iron core lamination 10a and the second type of iron core lamination 10b cooperate through the second fastening points 12 to form the second riveting structure of the segmented lamination 10.

[0027] Specific implementation methods are as follows Figure 5 As shown: Lamination A (Type I iron core lamination 10a) has the first snap point 11 at column M and the second snap point 12 at column N; Laminate B (second type of iron core laminate 10b) has a through hole 13 at column M and a second snap point 12 at column N; Lamination C (first type of iron core lamination 10a) has the first snap point 11 at column M and the second snap point 12 at column N; Laminated sheet D (second type of iron core laminate 10b) has a through hole 13 at column M and a second snap point 12 at column N; This cycle continues, meaning that at the M and N locations of the segmented laminate 10, there are both alternating snap points (first stacked riveting structure) and cylindrical snap points (second stacked riveting structure).

[0028] Furthermore, a third type of iron core lamination 10c is provided at the bottom. The third type of iron core lamination 10c is a through-plate structure, namely lamination K in the figure. The number of lamination K can be 1 or 2.

[0029] Furthermore, one or more of the first type of iron core laminations 10a can be provided on the upper surface of the segmented lamination 10; by arranging multiple first type of iron core laminations 10a, the iron core height can be easily adjusted, and each time laminations are added or removed, at least one lamination can be added or removed; for example, when there is only one lamination A on the upper surface, if laminations need to be removed, when lamination A is removed, lamination B only has one second snap point 12 in contact with lamination C, and cannot make close contact with the next lamination. Therefore, when lamination A is removed, lamination B also needs to be removed simultaneously.

[0030] This embodiment improves the internal connection strength and integrity of the segmented laminated body through a double-overlap riveting structure design. Specifically, the first riveting structure uses a first snap point 11 and a through hole 13 to allow the first snap point 11 of the first type of iron core laminate 10a to pass through the through hole 13 of the second type of iron core laminate 10b and cooperate with the first snap point 11 of the adjacent first type of iron core laminate 10a. This completely avoids the interference problem of the inclined surfaces of adjacent snap points in conventional inclined snap points and eliminates the gaps caused by interference between layers. Based on the first riveting structure, a second riveting structure is added. The second snap point 12 on the surfaces of the first type of iron core laminate 10a and the second type of iron core laminate 10b cooperate to form interlayer connection reinforcement points. The effective contact area is greatly increased, which significantly improves the shear resistance and interlayer tensile force, and achieves simultaneous optimization of the connection strength and stacking coefficient of the segmented laminated iron core.

[0031] Furthermore, a systematic comparative verification experiment was conducted to assess the technical effects of the collaborative design of the double-overlap riveting structure in this embodiment; the results are shown in Table 1.

[0032] Table 1. Comparison of the overall performance of iron cores with different stacked riveting structures Group Structural scheme description Overlay factor (%) Interlayer bonding strength (N) 1 Only the first stack of riveted structure 98.2% 10 2 Only the second stack riveting structure 97% 30 3 First riveting structure + second riveting structure 98.1% 25 Data comparison shows: Group 1: A high stacking factor (98.2%) was obtained, indicating that it can effectively eliminate the macroscopic gaps between laminations and make the core high density; however, its interlayer bonding force is only 10N, indicating that its ability to resist vertical pull-out force is limited, and it mainly relies on skeleton constraints to maintain integrity.

[0033] Group 2: The interlayer bonding force reached 30N, which is the highest among the three groups, proving that it can provide strong local anchor points and effectively resist interlayer separation; however, its stacking coefficient is only 97.0%, indicating that relying solely on dispersed anchor points is not enough to completely eliminate the micro gaps between the laminates.

[0034] Group 3: It simultaneously achieved a high stacking factor of 98.1% (close to Group 1 level) and a relatively high interlayer bonding force of 25N (far exceeding Group 1, close to Group 2 level). This indicates that the two structures are not simply superimposed, but rather achieve functional complementarity and synergistic reinforcement; that is, the first stacked structure provides a high-density basic framework, while the second stacked structure provides crucial local anchoring on this basis. Together, they ensure the overall density of the stacked core and significantly improve its pull-out resistance.

[0035] This embodiment achieves a balance between the two core indicators of stacking coefficient and interlayer bonding force by using a double-overlap riveting structure design for the stacked iron core, thus obtaining the optimal solution for overall performance.

[0036] In some embodiments, the first type of iron core lamination 10a and the second type of iron core lamination 10b may be provided with one or more of the second fastening points 12.

[0037] In some embodiments, both the first type of core lamination 10a and the second type of core lamination 10b include a yoke 101 constituting the main body of the magnetic circuit and a toothed portion 102 for winding; the second fastening point 12 is disposed on the yoke 101 and / or the toothed portion 102. The second fastening point 12 can be configured in various ways to adapt to motor core designs with different performance requirements: In some alternative embodiments, the second snap point 12 is disposed on the tooth portion 102; for example, as Figure 7a As shown, the second snap point 12 can be arranged along the root, middle or near the tip of the tooth 102, and includes at least... Figure 7a The positions 12a, 12b, 12c, 12d, 12e, etc. shown in the figure; in this embodiment, the interlayer connection reinforcement points are concentrated on the tooth 102, which is most complex in terms of stress and prone to vibration, to directly enhance its rigidity and interlayer bonding force; wherein, the tooth 102 may be provided with one or more second fastening points 12.

[0038] In some alternative embodiments, the second fastening point 12 is disposed on the yoke 101; for example, as Figure 7b As shown, it can be arranged in the middle area of ​​the yoke 101 or near the position connecting the first fastening point 11, including at least the following: Figure 7bThe positions 12f, 12g, 12h, 12i, 12j, etc. shown in the figure can ensure the integrity of the outer frame of the segmented laminate 10 while providing a stable support foundation for the internal teeth 102 and reducing the occupation of the effective magnetic conductive area of ​​the teeth 102; wherein, the yoke 101 may be provided with one or more second fastening points 12.

[0039] In some alternative embodiments, the second fastening points 12 are evenly distributed on the yoke 101 and the teeth 102; for example, at least one second fastening point 12 can be provided at the root of the teeth 102, and at least one second fastening point 12 can also be provided in the middle region of the yoke 101 or in the region near the root of the teeth 102; to provide a balanced restraining force and effectively suppress vibration of the teeth 102 and deformation of the yoke; such as Figure 7c As shown, in this embodiment, a second fastening point 12 is provided at the root of the tooth 102 and a second fastening point 12 is provided in the middle region of the yoke 101. The second fastening point 12 may also be provided in the connection region between the tooth 102 and the yoke 101.

[0040] It should be understood that designers can choose different configuration schemes (such as only the tooth section, only the yoke section, or both) according to the emphasis of the electromagnetic load and mechanical load of the motor, so as to achieve the optimal magnetic circuit performance or the best balance of overall performance while ensuring the reliability of the connection.

[0041] In some preferred embodiments, the second snap point 12 is located at the root of the tooth 102; wherein, the root of the tooth 102 is the starting transition region where the tooth 102 extends from the yoke 101. Figure 8 As shown, in this embodiment, for each tooth 102, a second fastening point 12 is provided at the center of its root, that is, the center of the second fastening point 12 is located on the center line of the tooth 102; alternatively, two or more second fastening points 12 may be symmetrically arranged at the root of the tooth 102 near the two side edges.

[0042] In some preferred embodiments, such as Figures 6-9 As shown, at least three first fastening points 11 / through holes 13 are provided, with two of the first fastening points 11 / through holes 13 located on the yoke 101 and one of the first fastening points 11 / through holes 13 located on the toothed portion 102. In this embodiment, three first fastening points 11 are stamped on the first type of iron core lamination 10a, with two first fastening points 11 located on the yoke 101 and one first fastening point 11 located on the toothed portion 102; at the corresponding position of the second type of iron core lamination 10b, three through holes 13 are precisely opened, with two through holes 13 located on the yoke 101 and one through hole 13 located on the toothed portion 102.

[0043] The description will take the first type of iron core lamination 10a as an example: The first fastening point 11 located in the yoke 101 is symmetrically arranged in the yoke 101 region about the center line of the tooth 102; its position selection should take into account the distance from the iron core dividing joint and ensure sufficient material strength to withstand the riveting force.

[0044] The first fastening point 11 located in the tooth 102 can be set in the middle of the tooth 102 according to the electromagnetic load distribution; and the first fastening point 11 and the two first fastening points 11 of the yoke 101 form a stable triangle in space.

[0045] During stacking, the three first fastening points 11 of the upper first type iron core lamination 10a pass through the three through holes 13 of the middle second type iron core lamination 10b and are precisely aligned with the tops of the three first fastening points 11 of the lower first type iron core lamination 10a; after applying axial pressure, the corresponding first fastening points 11 of the upper and lower layers are riveted; during this process, the first stacking riveting structure uses a triangular frame (two points of the yoke 101 and one point of the tooth 102) to lock the yoke area and the tooth area in an integrated manner in the thickness direction.

[0046] This embodiment provides a broad support foundation that can effectively resist shear stress and torsional stress in all directions, providing a rigid skeleton foundation for the entire segmented laminate 10; and the first riveting structure in this embodiment can solve the frame stability of the yoke 101 and the key anchoring problem of the toothed part 102 with the fewest connection points, and forms a functional and spatial complementarity with the second riveting structure.

[0047] In some preferred embodiments, combined with Figure 6 and Figure 9 As shown, the second snap point 12 is disposed within the triangular area formed by the three first snap points 11 / the through holes 13. This embodiment is based on the stable triangular skeleton provided in the previous embodiment, and fills the internal area defined by the skeleton to strengthen it; the triangular skeleton of the first stacked riveting structure prevents macroscopic misalignment, while the second stacked riveting structure distributed therebetween eliminates microscopic gaps. The combination of the two achieves full-scale strengthening from macroscopic to microscopic.

[0048] In some preferred embodiments, the second fastening point 12 is located at the centroid G of the triangular region. Specifically, the centroid G is the intersection of the three medians of the triangle. The riveting force applied by the second fastening point 12 at the centroid G can be transmitted and distributed to the three vertices of the basic skeleton in the most uniform and direct way. That is, any force that attempts to cause in-plane deformation (such as shearing or twisting) in the triangular region will be resisted in the most balanced way from the riveting point at the centroid G, pointing in three directions. This achieves the balance and efficiency of mechanical constraints, greatly reduces the risk of material fatigue, and improves the long-term reliability of the core.

[0049] To systematically verify the optimizing effect of the center of gravity G position on the core performance, while keeping other variables (such as snap-fit ​​size, lamination process, etc.) completely unchanged, only the position of the second snap-fit ​​12 within the triangular area was changed, and its impact on the key indicators of the core was tested. The results are shown in Table 2.

[0050] Table 2. The Influence of Different Positions of the Second Fastening Point on Key Core Performance Second deduction point position describe Overlay factor (%) Interlayer bonding strength (N) Center of gravity Intersection of the three center lines 98.9 26.0 heart Intersection of angle bisectors 98.1 22.5 Near the apex of the tooth Near the tooth fastening point 97.7 24.8 Data comparison shows that when the second buckling point 12 is placed at the center of gravity G, the core achieves optimal values ​​in both the stacking coefficient (98.9%) and the interlayer bonding force (26.0N). This indicates that the center of gravity, as the intersection of the three medians of the triangle, achieves the most balanced distribution of constraint forces on the three vertices mechanically. That is, it ensures no microscopic gaps between the laminations through uniform force (high stacking coefficient) and maximizes the pull-out resistance (high bonding force).

[0051] It should be understood that in designs requiring higher connection strength, two or more second buckles 12 can be arranged within the triangular area to form a small internal reinforcement array.

[0052] In some embodiments, the second snap point 12 is a cylindrical snap point structure. Specifically, the side of the cylindrical snap point is a vertical surface. When the iron core laminations are stacked, the cylindrical snap points of the upper and lower iron core laminations can achieve more precise lateral guidance and positioning, reducing the risk of misalignment. Furthermore, when subjected to interlayer shear force, the vertical side of the cylindrical snap point can provide a larger and more effective shear-resistant contact area, significantly enhancing its resistance to lateral misalignment compared to the tapered snap point with inclined contact. In addition, under axial pressure, the deformation mode of the cylindrical structure is more controllable and predictable, ensuring the consistency of riveting strength and connection reliability. In other embodiments, the second snap point 12 can also be a "V" shaped snap point structure or a trapezoidal snap point structure.

[0053] In some alternative embodiments, the cross-section of the second snap point 12 is any one of a circle, a square, or a polygon; in this embodiment, it is... Figure 6 As shown in the example, the cross-section of the second snap point 12 is circular.

[0054] In some embodiments, the thickness of the first type of iron core lamination 10a and the second type of iron core lamination 10b are equal, and the depth H of the second snap point 12 is 0.6-0.8 times the thickness T of the first type of iron core lamination 10a and the second type of iron core lamination 10b.

[0055] To verify the impact of this depth range on the overall performance of the iron core, using silicon steel sheets with a thickness of T=0.2mm as an example (the thickness of the first type of iron core lamination 10a and the second type of iron core lamination 10b is 0.2mm), comparative samples with different snap-in depths H were prepared, and their key performance was tested. The results are shown in Table 3.

[0056] Table 3. Influence of the second snapping depth (H) on the key performance of the iron core (T=0.20mm) Group Depth of the fastening point H (mm) H / T ratio Overlay factor (%) Interlayer bonding strength (N) 1 0.10 0.5 98 2 2 0.12 0.6 98.3 32 3 0.14 0.7 99 35 4 0.16 0.8 98.5 29 5 0.18 0.9 97.5 3 When H / T < 0.6 (Group 1): Due to insufficient snap-in depth, sufficient plastic flow and interlocking of materials cannot be achieved during stacking, resulting in severely insufficient interlayer bonding strength. Simultaneously, the weak bonding leads to microscopic gaps between the stacks, preventing the stacking factor from reaching its optimal level.

[0057] When H / T > 0.8 (Group 5): Excessively deep snaps will cause excessive plastic deformation of the silicon steel sheet substrate during stamping, resulting in severe grain distortion. Furthermore, excessive deformation stress may affect the flatness of the laminate, cause snap breakage, and indirectly lead to a decrease in the lamination coefficient and tensile strength.

[0058] When 0.6 ≤ H / T ≤ 0.8 (Groups 2, 3, and 4): the core achieves the best balance between high stacking factor and high bonding strength. Among them, when H / T = 0.7 (Group 3), the overall performance reaches its peak, achieving reliable mechanical connection and excellent electromagnetic performance.

[0059] In some preferred embodiments, the cross-section of the second snap point 12 is as follows: Figure 6 When the circle is shown, the ratio of the depth H of the second snap point 12 to the diameter D of the second snap point 12 is 0.05-0.1.

[0060] Taking the depth H as an example, which is in the range of 0.6T-0.8T, and using the core lamination thickness T=0.20mm as an example, the explanation is based on this.

[0061] Within this ratio range, the size combination of the second snap point 12 can be: depth H between 0.12mm and 0.16mm, and diameter D between 1.6mm and 2.4mm. Table 4 shows the effect of changing the diameter D (i.e., changing the H / D ratio) on the core performance of the iron core under the condition of fixed depth H=0.14mm (H=0.7T).

[0062] Table 4. Influence of the second snap-in diameter (D) and height-to-diameter ratio (H / D) on key core performance. Group Diameter D (mm) H / D ratio Overlay factor (%) Interlayer bonding strength (N) 1 1.0 0.140 97.6 10 2 1.6 0.088 98 25 3 2.0 0.070 99.1 34 4 2.4 0.058 97.9 27 5 3.0 0.047 97.7 23 When H / D > 0.1 (e.g., group 1, H / D = 0.14): the second snap point 12 is too thin and tall; although it has little impact on the magnetic circuit, it is prone to instability during riveting, and the effective anchoring area provided is insufficient, resulting in low interlayer bonding strength of the laminates, and uneven constraint between the laminates leads to poor stacking coefficient.

[0063] When H / D < 0.05 (e.g., group 5, H / D = 0.047): the second snap point 12 is too flat; although the connection area is large, the large diameter required to form this shape seriously occupies the effective magnetic conductive area, and the severe stamping deformation may affect the material properties.

[0064] When 0.05≤H / D≤0.1 (e.g., groups 2, 3, 4): within this range, the two core indicators of core stacking coefficient and interlaminar bonding strength are simultaneously optimized to achieve the best balance.

[0065] Example 2 This invention also provides a method for manufacturing a segmented laminated iron core, which includes at least the following steps: a) Stamping to obtain a first type of iron core lamination, wherein the first type of iron core lamination is punched with a first buckle point protruding from the surface, and a second buckle point is punched on the first type of iron core lamination; b) Stamping to obtain a second type of iron core lamination, wherein the second type of iron core lamination is punched with through holes for the first fastening point to pass through, and a second fastening point is punched on the second type of iron core lamination; c) The first type of iron core lamination and the second type of iron core lamination are stacked in sequence to form a segmented lamination body, wherein two adjacent first type iron core laminations are fastened by a first fastening point, and adjacent first type iron core laminations and second type iron core laminations are fastened by a second fastening point.

[0066] Furthermore, this embodiment also includes the following steps: By independently controlling the stamping actions of the first snap-on punch, the second snap-on punch, and the through-hole punch, the first type of iron core laminations and / or the second type of iron core laminations are selectively stamped on the iron core strip.

[0067] This embodiment also provides manufacturing equipment for segmented laminated iron cores, specifically a progressive stamping die; the stamping die is equipped with the following at different workstations: First snap-on punch: Used to form the first snap-on point on the first type of iron core lamination; Second snap-on punch: used to form the second snap-on point on the first type of iron core lamination and the second type of iron core lamination; Through-hole punch: Used to form through holes on the second type of iron core laminations; Through-hole punch: used in combination with the through-hole punch to form the third type of iron core lamination.

[0068] The first snap-on punch, the second snap-on punch, and the through-hole punch are each equipped with an independent drive mechanism (such as a servo drive unit or a hydraulic drive unit), which can independently control the stamping action, stroke, and pressure of each punch according to production needs.

[0069] The progressive stamping die is activated, allowing the iron core strip 2 to pass through each station sequentially, combined with... Figure 11 As shown, it includes: guiding station 201, idle step 202, round buckle point through-piece station (i.e., through-piece forming station) 203, idle step 204, square buckle point through-piece station (i.e., through-hole forming station) 205, idle step 206, round buckle point fastening station (i.e., second buckle point forming station) 207, idle step 208, square buckle point fastening station (i.e., first buckle point forming station) 209, idle step 2010, idle step 2011, and product blanking station 2012; During the formation of the first type of iron core laminations, the following processes are performed sequentially: When the iron core strip 2 passes through the round snap fastener station (i.e. the second snap fastener forming station) 207, the second snap fastener punch is activated to stamp the second snap fastener on the surface of the first type of iron core lamination. When the iron core strip 2 passes through the square snap fastener station (i.e. the first snap fastener forming station) 209, the first snap fastener punch is activated to stamp a protruding first snap fastener on the surface of the first type of iron core lamination. During this process, the through-hole punch and the through-plate punch are deactivated to ensure that no through holes are formed on the first type of iron core lamination.

[0070] By adjusting the stamping stroke of the first and second snap-on punches, the forming depth of the first and second snap-on points can be precisely controlled to meet the preset process requirements.

[0071] During the process of forming the second type of iron core laminations, the following steps are performed sequentially: When the iron core strip 2 passes through the square buckle point through plate station (i.e. through hole forming station) 205, the through hole punch is activated to punch through holes on the second type of iron core stack to allow the first buckle point to pass through. When the iron core strip 2 passes through the round snap fastener station (i.e. the second snap fastener forming station) 207, the second snap fastener punch is activated to stamp the second snap fastener on the surface of the second type of iron core lamination. During this process, the first snap-on punch and the through punch are deactivated to ensure that the first snap-on point is not formed on the second type of iron core lamination.

[0072] Similarly, by independently controlling the stamping stroke of the second snapping punch, the depth of the second snapping point on the second type of iron core lamination is kept consistent with that of the first type of iron core lamination (2), so as to ensure the matching accuracy during subsequent riveting.

[0073] During the process of forming the third type of iron core laminations, the following steps are performed sequentially: When the iron core strip 2 passes through the round buckle point through-piece station (i.e. through-piece forming station) 203, the through-piece punch is activated to punch a round hole for the second buckle point to pass through on the third type of iron core stack. When the iron core strip 2 passes through the square buckle point through plate station (i.e. through hole forming station) 205, the through hole punch is activated to punch through holes on the third type of iron core stack to allow the second buckle point to pass through. During this process, the first snap-on punch and the second snap-on punch are deactivated to ensure that the third type of iron core laminations form a through-sheet structure.

[0074] Furthermore, this embodiment enables modular switching of production configurations by independently controlling the stamping action of each punch: (1) Simultaneously enable two types of anchor points (double overlapping anchor mode): When it is necessary to produce a double-overlap riveted core as described in Example 1, the first snap-on punch, the second snap-on punch, and the through-hole punch are used simultaneously, so that the first type of core lamination has both the first snap-on punch and the second snap-on punch, and the second type of core lamination has both the through-hole and the second snap-on punch.

[0075] (2) Only the first snap point is enabled (single first stacking riveting mode): When only the first stack riveting structure is required for a specific application scenario, all second snap-on punches can be selectively disabled, and only the first snap-on punch and the through-hole punch can be enabled. In this case, the first type of iron core lamination has only the first snap-on, and the second type of iron core lamination has only the through-hole, and the product only forms the first stack riveting structure.

[0076] (2) Only enable the second buckle point (single second stack riveting mode): When only the second riveting structure is required, the first snap-on punch and the through-hole punch can be selectively disabled, and only the second snap-on punch can be used. In this case, both the first type of iron core lamination and the second type of iron core lamination have only the second snap-on point, and the product only forms the second riveting structure.

[0077] Based on actual needs, different modes can be quickly switched during production, effectively improving the adaptability of the production line.

[0078] Example 3 This invention also provides a rotary electric motor, which includes the segmented laminated iron core described in Embodiment 1 above. This rotary electric motor can be, for example, a permanent magnet synchronous motor, an induction motor, or a switched reluctance motor. The segmented laminated iron core, serving as the stator or rotor core of the rotary electric motor, directly and significantly improves the overall performance of the machine through its high connection strength, high rigidity, and low loss characteristics.

[0079] This invention improves the interlayer connection strength and the overall integrity of the stacked iron core through the design of a double-overlap riveting structure, thereby enabling the rotary motor to achieve higher operating efficiency and power density. The excellent mechanical reliability of the iron core ensures the long-term stable operation of the motor under harsh conditions such as high speed, high load or frequent start and stop.

[0080] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A segmented laminated iron core, comprising a plurality of segmented laminates connected to each other in the circumferential direction, each of the segmented laminates being provided with at least two types of riveting structures, characterized in that: The segmented laminated body includes at least a first type of iron core laminate and a second type of iron core laminate; wherein... The first type of iron core lamination has a first snap point formed on its surface, and the second type of iron core lamination has a through hole corresponding to the position of the first snap point. The first snap point of the first type of iron core lamination is configured to pass through the through hole of the second type of iron core lamination to cooperate with the first snap point of another adjacent first type of iron core lamination to form the first riveting structure of the segmented lamination. Both the first type of iron core lamination and the second type of iron core lamination have second fastening points on their surfaces. The first type of iron core lamination and the second type of iron core lamination cooperate through the second fastening points to form the second riveting structure of the segmented lamination.

2. The segmented laminated iron core as described in claim 1, characterized in that: The second deduction point is set with one or more.

3. The segmented laminated iron core as described in claim 1, characterized in that: Both the first type of iron core lamination and the second type of iron core lamination include a yoke and a toothed portion, and the second fastening point is disposed on the yoke and / or the toothed portion.

4. The segmented laminated iron core as described in claim 3, characterized in that: At least one of the first fastening points / through holes is located in the yoke portion, and at least one of the first fastening points / through holes is located in the tooth portion.

5. The segmented laminated iron core as described in claim 4, characterized in that: The second fastening point is located within the triangular area enclosed by the three first fastening points / through holes.

6. The segmented laminated iron core as described in claim 1, characterized in that: The second buckle point is located at the centroid of the triangular region.

7. The segmented laminated iron core as described in claim 1, characterized in that: The depth of the second snap point is 0.2-2 times the thickness of the first type of iron core lamination and the second type of iron core lamination.

8. The segmented laminated iron core as described in claim 1, characterized in that: The second fastening point is a cylindrical fastening point structure, a "V" shaped fastening point structure, or a trapezoidal fastening point structure; the cross-section of the second fastening point is any one of a circle, a square, or a polygon.

9. The segmented laminated iron core as described in claim 8, characterized in that: When the cross-section of the second snap point is circular, the ratio of the depth of the second snap point to the diameter of the second snap point is 0.05-0.

3.

10. A method for manufacturing a segmented laminated iron core, characterized in that, To manufacture a segmented laminated iron core as described in any one of claims 1-9, the process includes at least the following steps: a) Stamping to obtain a first type of iron core lamination, wherein the first type of iron core lamination is punched with a first buckle point protruding from the surface, and a second buckle point is punched on the first type of iron core lamination; b) Stamping to obtain a second type of iron core lamination, wherein the second type of iron core lamination is punched with through holes for the first fastening point to pass through, and a second fastening point is punched on the second type of iron core lamination; c) The first type of iron core lamination and the second type of iron core lamination are stacked in sequence to form a segmented lamination body, wherein two adjacent first type iron core laminations are fastened by a first fastening point, and adjacent first type iron core laminations and second type iron core laminations are fastened by a second fastening point.

11. The method for manufacturing a segmented laminated iron core as described in claim 10, characterized in that, It also includes the step of: selectively stamping the first type of iron core lamination and / or the second type of iron core lamination on the iron core strip by independently controlling the stamping action of the first snap-on punch, the second snap-on punch, and the through-hole punch.

12. A rotary electric motor, characterized in that, It includes the segmented laminated iron core as described in any one of claims 1-9.

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