Stator core with staggered and laminated punching sheets

Abstract

The utility model relates to the technical field of flat wire motors, in particular to a stator core with staggered and laminated punching sheets. Each punching segment comprises a tooth part and a yoke part, and the yoke part is located at one end of the tooth part; a first connecting part is arranged on one side of the yoke part, and the side surface of the first connecting part is a first connecting surface; the other side of the yoke part is provided with a second connecting part, and the side surface of the second connecting part is a second connecting surface; the first connecting face and the second connecting face are both of a non-planar special-shaped structure, and the first connecting face and the second connecting face can be spliced in a matched mode. According to the utility model, the connection part of the two adjacent punching sheet sections is arranged to be the special-shaped surface structure, so that the mutual contact area is increased. The adhesive area is increased, and the overall structural stability of the stator core is effectively improved. The magnetic resistance of the iron core is inversely proportional to the area of the joint, and the larger the connecting area of the joint is, the smaller the magnetic resistance is, and the larger the torque is. Therefore, the stator core provided by the utility model is smaller in magnetic resistance and larger in torque.

Description

Technical Field

[0001] The utility model belongs to the technical field of flat wire motors, and particularly relates to a stator core with interleaved lamination of punching sheets. Background Art

[0002] The spliced stator core is a common structure of flat wire stator cores. The spliced stator core is axially divided into multiple layers of circular iron sheets, and each circular iron sheet is composed of multiple sector punching segments spliced together.

[0003] For example, the technical solution disclosed in the patent with the patent number CN208272720U is as follows: The stator core includes multiple iron sheets, and the multiple iron sheets are stacked along the axial direction of the stator core. Each iron sheet is formed into an annular structure and includes multiple punching segments arranged end to end in sequence along the circumference. A seam is formed between two adjacent punching segments. Along the axial direction of the stator core, the seams of the nth layer and the seams of the (n + m)th layer are staggered, where n and m are both positive integers, and n and m respectively satisfy n≥1 and m≥1, and the seam is formed into a straight line segment. To achieve the technical effects of reducing the axial splicing error of the iron sheets, avoiding the occurrence of interlayer eddy current conduction at the seams of punching segments in different layers, thereby reducing the eddy current loss of the stator core; and at the same time, avoiding the easy detachment of punching segments in different layers and improving the overall rigidity of the stator core.

[0004] For some special application scenarios, such as when the stator core requires the use of magnetically sensitive materials, it cannot be fixed by welding or riveting, and the punching segments can only be bonded together by glue. At this time, the contact area between adjacent punching segments is required to be as large as possible. Although in the patent solution of CN208272720U, by setting the seam as an inclined straight line segment, the contact area between adjacent punching segments in the same layer can be increased, but the increased area is limited. As Figure 1 shown, if the included angle θ between the seam and the yoke edge is reduced, the contact area can be further increased. However, if the included angle θ is too small, it is easy to cause the punching segment to warp, affecting the overall structural stability of the iron core. Summary of the Utility Model

[0005] Aiming at the above problems, the utility model provides a stator core with interleaved lamination of punching sheets. The stator core includes several layers of circular iron sheets, and the several layers of circular iron sheets are stacked in sequence along the axial direction of the stator core and can be fixedly connected by glue; each layer of circular iron sheet includes several punching segments adhesively connected end to end along its circumference;

[0006] Each punching segment includes a tooth portion and a yoke portion, and the yoke portion is located at one end of the tooth portion; a first connecting portion is provided on one side of the yoke portion, and the side surface of the first connecting portion is a first connecting surface; a second connecting portion is provided on the other side of the yoke portion, and the side surface of the second connecting portion is a second connecting surface; both the first connecting surface and the second connecting surface are non-planar special-shaped structures, and the first connecting surface and the second connecting surface can be cooperatively spliced;

[0007] Along the circumferential direction of the stator core, the stator core is divided into a plurality of punching pieces; each punching piece includes a plurality of punching segments along its axial direction, and the tooth portion axes of the punching segments in the same punching piece are coplanar, and the two side surfaces of the yoke portion of any punching segment in the circumferential direction are respectively staggered with the two side surfaces of the yoke portion of one or more punching segments in the same punching piece in the circumferential direction along the axial direction of the stator core. Further,

[0008] Further, in the same circular iron core sheet, for any two adjacent punching segments along its circumferential direction, the first connecting surface of one punching segment is attached to the second connecting surface of the other punching segment to form a joint; and a stator slot layer is constructed between the two punching segments;

[0009] The stator slot layers are stacked along the axial direction of the stator core to form a stator slot.

[0010] Further, along the axial direction of the stator core, in the same punching piece, the first connecting surface of any punching segment is arranged adjacent to the second connecting surface of the adjacent layer punching segment; the second connecting surface of any punching segment is arranged adjacent to the first connecting surface of the adjacent layer punching segment.

[0011] Further, the first connecting surface is three sequentially connected planes, wherein, the first plane is perpendicular to the outer circle of the yoke portion, and the second plane is perpendicular to the inner circle of the yoke portion; the third plane is arranged between the first plane and the second plane and connects the first plane and the second plane respectively;

[0012] The second connecting surface matches the first connecting surface.

[0013] Further, both the first connecting surface and the second connecting surface are smooth arc surfaces.

[0014] Further, the overlapping length c of any punching segment and the adjacent layer punching segment on the adjacent punching piece in the circumferential direction of the stator core satisfies: 2d ≤ c ≤ e; wherein, d is the thickness of a single punching segment along the axial direction of the stator core, and e is the width of the bottom of the stator slot along the circumferential direction of the stator core.

[0015] Further, the deflection directions of the first connecting surface and the second connecting surface on the same punching segment are the same; the deflection directions of the joints on any two adjacent layers of circular iron core sheets are opposite.

[0016] The beneficial effects of the present utility model are:

[0017] 1. By setting the connection part between adjacent punching segments as a special-shaped surface structure, the present utility model increases the mutual contact area. The bonding area is increased, effectively improving the overall structural stability of the stator core. Moreover, the magnetic reluctance of the core is inversely proportional to the connection area. The larger the connection area at the joint, the smaller the magnetic reluctance and the greater the torque. Therefore, the stator core proposed by the present utility model has a smaller magnetic reluctance and a greater torque.

[0018] 2. The punching segments in the same punching piece block are arranged in an alternating direction, so that each punching segment has an overlapping part with the punching segments of the adjacent layer on the adjacent punching piece block, making each joint unable to penetrate the stator core, reducing the eddy current loss of the stator core; and each punching segment is adhesively connected to at least five punching segments, further improving the overall structural stability of the stator core.

[0019] 3. During the processing of the stator core, each punching piece block can be connected into one body by adhesive bonding. The larger the overlapping area of the punching segments between two punching piece blocks, the more stable the adhesive connection. By setting the staggered overlapping area between adjacent punching piece blocks, the overall stiffness of the stator core can be improved.

[0020] 4. By increasing the number of plate types of the punching segments, the optional schemes for realizing staggered joints are enriched. Moreover, for the plate type of the punching segment with a large yoke size, its overlapping length with the punching segments of the adjacent layer is larger, which can further improve the overall stiffness of the stator core.

[0021] Other features and advantages of the present utility model will be described in the subsequent description, and part of them will be obvious from the description or understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 Shows a schematic structural diagram of the punching segment of the stator core of the prior art;

[0024] Figure 2 Shows a schematic structural diagram of the stator core of the embodiment of the present utility model;

[0025] Figure 3 Shows a schematic structural diagram of the circular iron chip of the embodiment of the present utility model;

[0026] Figure 4 Shows a structural schematic diagram of a single punching segment with a smooth arc-shaped joint in an embodiment of the present utility model;

[0027] Figure 5 Shows a front view of an outer-rotor stator core in an embodiment of the present utility model;

[0028] Figure 6 Shows a connection schematic diagram of adjacent punching segments in two adjacent punching blocks in an embodiment of the present utility model;

[0029] Figure 7 Shows a partial structural schematic diagram of a circular iron chip with a stepped joint in an embodiment of the present utility model;

[0030] Figure 8 Shows a structural schematic diagram of a punching segment in which a first connection surface and a second connection surface are deflected clockwise in an embodiment of the present utility model;

[0031] Figure 9 Shows a structural schematic diagram of a punching segment in which a first connection surface and a second connection surface are deflected counterclockwise in an embodiment of the present utility model;

[0032] Figure 10 Shows a partial structural schematic diagram of a stator core in which a punching sheet group includes multiple punching segments in an embodiment of the present utility model.

[0033] In the figure: 1 - circular iron chip; 2 - punching segment; 21 - first punching segment; 22 - second punching segment; 3 - tooth part; 4 - yoke part; 41 - first connection part; 42 - second connection part; 43 - first connection surface; 44 - second connection surface; 5 - stator slot layer; 6 - stator slot; 7 - punching block. Detailed implementation manners

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0035] The present utility model provides a stator core with interleaved and laminated punching sheets, as Figure 2 shown, the stator core includes several layers of circular iron chips 1, and the several layers of circular iron chips 1 are sequentially laminated along the axial direction of the stator core and can be fixedly connected by adhesive.

[0036] As Figure 3As shown, each layer of circular iron core chip 1 includes a number of punching segments 2 adhesively connected end to end in sequence along its circumferential direction.

[0037] Specifically, as Figure 4 shown, each punching segment 2 includes a tooth portion 3 and a yoke portion 4, and the yoke portion 4 is located at one end of the tooth portion 3; a first connecting portion 41 is provided on one side of the yoke portion 4, and the side surface of the first connecting portion 41 is a first connecting surface 43; a second connecting portion 42 is provided on the other side of the yoke portion 4, and the side surface of the second connecting portion 42 is a second connecting surface 44; both the first connecting surface 43 and the second connecting surface 44 are non-planar special-shaped structures, and the first connecting surface 43 and the second connecting surface 44 can be cooperatively spliced.

[0038] It should be noted that the stator core provided by the embodiment of the present utility model can be an outer-rotor stator core or an inner-rotor stator core. As Figure 2 shown, for the inner-rotor stator core, the tooth portion 3 is located on the inner circular side of the yoke portion 4. As Figure 5 shown, for the inner-rotor stator core, the tooth portion 3 is located on the outer circular side of the yoke portion 4.

[0039] Furthermore, as Figure 3 shown, in the same circular iron core chip 1, for any two adjacent punching segments along its circumferential direction, the first connecting surface 43 of one punching segment is attached to the second connecting surface 44 of the other punching segment to form a joint; and a stator slot layer 5 is constructed between the two punching segments.

[0040] As Figure 6 shown, each stator slot layer 5 is stacked along the axial direction of the stator core to form a stator slot 6.

[0041] Furthermore, as Figure 6 shown, along the circumferential direction of the stator core, the stator core is divided into a plurality of punching blocks 7; each punching block 7 includes a plurality of punching segments 2 along its axial direction, and the axes of the tooth portions 3 of the punching segments 2 in the same punching block 7 are coplanar, and the two side surfaces of the yoke portion 4 of any punching segment 2 in the circumferential direction are respectively staggered with the two side surfaces of the yoke portions 4 of one or more punching segments 2 in the same punching block 7 along the axial direction of the stator core.

[0042] By setting the joint between two adjacent punching segments as a special-shaped surface structure, the present utility model increases the mutual contact area. The adhesive area is increased, effectively improving the overall structural stability of the stator core. Moreover, the magnetic resistance of the iron core is inversely proportional to the area of the connection part. The larger the connection area at the joint, the smaller the magnetic resistance and the greater the torque. Therefore, the stator core proposed by the present utility model has a smaller magnetic resistance and a greater torque.

[0043] Furthermore, as Figure 7As shown, the first connecting surface 43 is composed of three sequentially connected planes. Among them, the first plane is perpendicular to the outer circle of the yoke 4, and the second plane is perpendicular to the inner circle of the yoke 4; the third plane is arranged between the first plane and the second plane, connecting the first plane and the second plane respectively. The second connecting surface 44 matches the first connecting surface 43.

[0044] By setting the first connecting surface 43 and the second connecting surface 44 in a stepped shape, the connection area between each punching segment and the adjacent punching segments in the circumferential direction is increased, enhancing the overall stability of the stator core.

[0045] Preferably, as Figure 4 shown, both the first connecting surface 43 and the second connecting surface 44 are smooth arc surfaces.

[0046] To increase the contact area between two adjacent punching segments in the circumferential direction, the first connecting surface and the second connecting surface can be set to mutually matching irregular shapes. However, this setting will increase the production process difficulty of the punching segments. By setting the first connecting surface and the second connecting surface as smooth arc surfaces, while increasing the contact area, the production process difficulty of the punching segments can be reduced.

[0047] Furthermore, as Figure 6 shown, for any punching segment 2 and the adjacent punching segments 2 on the adjacent layer of the punching block 7 in the circumferential direction of the stator core, the overlapping length c satisfies: 2d ≤ c ≤ e; where d is the thickness of a single punching segment along the axial direction of the stator core, and e is the width of the bottom of the stator slot along the circumferential direction of the stator core.

[0048] During the processing of the stator core, the punching blocks can be connected into one body by means of glue. The larger the overlapping area of the punching segments between two punching blocks, the more stable the glue connection. By setting the staggered overlapping area between adjacent punching blocks, the overall stiffness of the stator core can be improved.

[0049] Preferably, as Figure 6 shown, along the axial direction of the stator core, in the same punching block, the first connecting surface 43 of any punching segment is arranged adjacent to the second connecting surface 44 of the adjacent layer punching segment; the second connecting surface 44 of any punching segment is arranged adjacent to the first connecting surface 43 of the adjacent layer punching segment.

[0050] By arranging the punching segments in the same punching block in an alternating and reverse direction, each punching segment has an overlapping part with the punching segments on the adjacent layer of the adjacent punching block, so that each joint cannot penetrate the stator core, reducing the eddy current loss of the stator core; and each punching segment is adhesively connected to at least five punching segments, further improving the overall structural stability of the stator core.

[0051] Exemplarily, as Figure 6As shown, the stator core includes 10 layers of circular iron core sheets 1. Along the axial direction of the stator core, the deflection directions of the first connection surface 43 and the second connection surface 44 of each punching segment 2 on the circular iron core sheets 1 of the odd-numbered layers are as shown in Figure 9 shown, which is counterclockwise deflection; the deflection directions of the first connection surface 43 and the second connection surface 44 of each punching segment 2 on the circular iron core sheets 1 of the even-numbered layers are as shown in Figure 8 shown, which is clockwise deflection.

[0052] By setting the deflection directions of the seams on the adjacent-layer circular iron core sheets 1 to be opposite, it is ensured that the arc seams of the adjacent layers are staggered, increasing the overlapping length c of each punching segment in the circumferential direction of the stator core among the adjacent punching blocks, and further improving the overall stiffness of the stator core after adhesive connection.

[0053] Furthermore, 2 or more types of plate-shaped punching segments 2 are adopted in each layer of circular iron core sheet 1; 2 or more types of plate-shaped punching segments are adopted in each punching block 7.

[0054] In the same circular iron core sheet 1, along its circumferential direction, the plate types of any two adjacent punching segments 2 are different. The same punching block includes a plurality of punching groups stacked in sequence; each punching group includes 1 or more punching segments of the same plate type; the plate types of the punching segments adopted by any two adjacent punching groups are different.

[0055] Exemplarily, as shown in Figure 10 shown, the stator core adopts two plate types of the first punching segment 21 and the second punching segment 22. Along the axial direction of the stator core, each punching block 7 includes a plurality of punching groups stacked in sequence. Each punching group includes three punching segments 2 of the same plate type and stacked in alignment in sequence; the plate types of the punching segments 2 adopted by any two adjacent punching groups are different.

[0056] By increasing the number of plate types of the punching segments, the optional schemes for realizing seam staggering are enriched. Moreover, for the plate type of the punching segment with a large yoke size, its overlapping length with the punching segments of the adjacent layer is larger, which can further improve the overall stiffness of the stator core. In addition, when each punching group includes a plurality of punching segments, the seams are set to be spaced and staggered, and the overall splicing and fixing of the stator core can also be realized. However, the overall structural stability of the stator core is somewhat reduced compared with that of the stator core with each seam staggered.

[0057] It should be noted that when the number of plate types of the punching segments adopted by the stator core is even, the number of stator slots on the stator core is even; when the number of stator slots on the stator core is odd, the number of plate types of the punching segments adopted by the stator core can be odd.

[0058] Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A stator core with interleaved and laminated punching sheets, characterized in that The stator core includes several layers of circular iron laminations (1), and the several layers of circular iron laminations (1) are stacked in sequence along the axial direction of the stator core and can be fixedly connected by adhesive; each layer of circular iron lamination (1) includes several punching segments (2) adhesively connected end to end in sequence along its circumferential direction; Each punching segment (2) includes a tooth portion (3) and a yoke portion (4), and the yoke portion (4) is located at one end of the tooth portion (3); a first connecting portion (41) is arranged on one side of the yoke portion (4), and the side surface of the first connecting portion (41) is a first connecting surface (43); a second connecting portion (42) is arranged on the other side of the yoke portion (4), and the side surface of the second connecting portion (42) is a second connecting surface (44); both the first connecting surface (43) and the second connecting surface (44) are non-planar special-shaped structures, and the first connecting surface (43) and the second connecting surface (44) can be fitted and spliced; Along the circumferential direction of the stator core, the stator core is divided into a plurality of punching blocks (7); each punching block (7) includes a plurality of punching segments (2) along its axial direction, and the axes of the tooth portions (3) of the punching segments (2) in the same punching block (7) are coplanar, and the two side surfaces of the yoke portion (4) of any punching segment (2) in the circumferential direction are respectively staggered with the two side surfaces of the yoke portion (4) of one or more punching segments (2) in the same punching block (7) along the axial direction of the stator core.

2. The stator core with interleaved laminations of punching sheets according to claim 1, characterized in that, In the same circular iron lamination (1), for any two adjacent punching segments (2) along its circumferential direction, the first connecting surface (43) of one punching segment (2) is attached to the second connecting surface (44) of the other punching segment (2) to form a joint; and a stator slot layer (5) is constructed between the two punching segments (2); The stator slot layers (5) are stacked in sequence along the axial direction of the stator core to form a stator slot (6).

3. A stator core with interleaved laminations of punching sheets according to claim 1, characterized in that, Along the axial direction of the stator core, in the same punching block, the first connecting surface (43) of any punching segment (2) is arranged adjacent to the second connecting surface (44) of the adjacent-layer punching segment (2); the second connecting surface (44) of any punching segment (2) is arranged adjacent to the first connecting surface (43) of the adjacent-layer punching segment (2).

4. A stator core with interleaved laminations of punching sheets according to claim 1, characterized in that The first connecting surface (43) is three planes connected in sequence, wherein, the first plane is perpendicular to the outer circle of the yoke portion (4), and the second plane is perpendicular to the inner circle of the yoke portion (4); the third plane is arranged between the first plane and the second plane and connects the first plane and the second plane respectively; The second connecting surface (44) matches the first connecting surface (43).

5. A stator core with interleaved and laminated punching sheets according to claim 1, characterized in that, Both the first connecting surface (43) and the second connecting surface (44) are smooth arc surfaces.

6. A stator core with interleaved and laminated punching sheets according to any one of claims 1-5, characterized in that The overlapping length c of any punching segment (2) and the adjacent-layer punching segment (2) on the adjacent punching block (7) in the circumferential direction of the stator core satisfies: 2d ≤ c ≤ e; where, d is the thickness of a single punching segment along the axial direction of the stator core, and e is the width of the bottom of the stator slot along the circumferential direction of the stator core.

7. The stator core with interleaved and laminated punching sheets according to claim 5, characterized in that, The deflection directions of the first connecting surface (43) and the second connecting surface (44) on the same punching segment (2) are the same; the deflection directions of the joints on any two adjacent layers of circular iron laminations (1) are opposite.

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