Stator punching sheet, stator iron core, motor and punching device
By designing fan-shaped stator punchings and a spirally laminated structure, the problems of large stator core loss and poor magnetic conductivity are solved, efficient production and low-loss stator cores are achieved, and motor performance is improved.
Patent Information
- Application Number
- CN202422668675.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-11-01
AI Technical Summary
The structure of existing stator punching sheets results in large stator core losses, poor magnetic conductivity, and low stamping process efficiency.
The fan-shaped stator punching is designed so that the central angle between the head and tail ends is greater than 180 degrees. Multiple punchings are stacked to form the stator core. Each layer has only one splicing seam. They are spirally stacked and connected to adjacent punchings by a fixed structure. They are punched using complementary stamping dies.
The magnetic flux resistance of the stator core is reduced, the number of splicing seams is reduced, the magnetic conductivity and production efficiency are improved, and the punching cost and loss are reduced.
Smart Images
Figure CN223414651U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a stator punching sheet, a stator core, a motor and a punching device. Background Art
[0002] Electric motors are key devices that convert electrical energy into mechanical energy. They play a vital role in industry, transportation, and daily life, and their performance directly impacts their operational efficiency and reliability. The stator core, a crucial component of the motor, secures the stator windings and provides the motor's magnetic circuit. The stator core is typically composed of stacked stator laminations, and its magnetic conductivity has a crucial influence on motor performance. However, due to the limitations of existing stator lamination structures, the stator core suffers from significant losses. Utility Model Content
[0003] The main purpose of the utility model is to provide a stator punching sheet, a stator core, a motor and a punching device, aiming to reduce the loss of the stator core.
[0004] To achieve the above-mentioned purpose, an embodiment of the present invention proposes a stator punching sheet, which includes a punching sheet body, which is fan-shaped and has a head end and a tail end spaced apart, and the central angle corresponding to the solid part between the head end and the tail end is α, α>180 degrees.
[0005] In one embodiment, α=N*β, 2N is greater than Z, and β=360° / Z; wherein N is a positive integer, and Z is the number of stator slots.
[0006] In one embodiment, the stator punching sheet further includes a first assembly structure provided at the head end and a second assembly structure provided at the tail end, and the first assembly structure and the second assembly structure are located on both sides of the punching sheet body.
[0007] In one embodiment, one of the first assembly structure and the second assembly structure is an assembly protrusion, and the other of the second assembly structure is an assembly recess.
[0008] To achieve the above objectives, an embodiment of the present invention provides a stator core, which includes the stator punching sheets described above.
[0009] In one embodiment, a plurality of stator punching sheets are provided, and the head end of one stator punching sheet is spliced with the tail end of an adjacent stator punching sheet so that the plurality of stator punching sheets are stacked in a spiral shape.
[0010] In one embodiment, the stator core further includes a fixing structure, and the fixing structure connects two adjacent stator punching sheets.
[0011] In one embodiment, the fixing structure is configured as a bonding structure, a buckle point structure or a welding structure.
[0012] To achieve the above objectives, an embodiment of the present invention provides a motor, which includes a rotor core and the stator core described above, wherein the stator core is sleeved on the outside of the rotor core.
[0013] To achieve the above-mentioned purpose, an embodiment of the present invention proposes a stamping device, which is used to stamp the stator punching sheets described above. The stamping device includes at least a first stamping die and a second stamping die arranged along the width direction of the material. The stator punching sheets stamped by the first stamping die and the second stamping die are arranged in a complementary manner.
[0014] The technical solution of the present application sets the central angle corresponding to the solid portion between the head and tail ends of the sector-shaped ring-shaped punching body to be greater than 180 degrees. In a stator core formed by stacking multiple stator punchings, each layer of stator punchings has only one splicing seam, effectively reducing the number of splicing seams. On the one hand, this can reduce the resistance of the stator core's magnetic flux passing through the splicing seams, thereby improving the magnetic conductivity of the stator core. On the other hand, compared with stator punchings with a small central angle, the number of stator punchings required for the entire stator core during splicing is reduced. For a single stator core, the number of stampings during the stamping process is reduced, which can improve the stamping rate and production efficiency, effectively reducing the stamping cost. Furthermore, the stamping circumference of the stator core is reduced, which can effectively reduce the loss of the stator core. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0016] Figure 1 This is a structural diagram of an embodiment of a stator punching sheet of the utility model;
[0017] Figure 2 This is a schematic diagram of the stator punching sheets in the stator core embodiment of the present invention in a spliced and unfolded state;
[0018] Figure 3 This is a schematic diagram of the stator punching splicing explosion state in the stator core embodiment of the present invention;
[0019] Figure 4 This is a schematic diagram of the arrangement of the stator punching sheets in the embodiment of the punching device of the utility model. Figure 1 ;
[0020] Figure 5 This is a schematic diagram of the arrangement of the stator punching sheets in the embodiment of the punching device of the utility model. Figure 2 .
[0021] Description of Figure Numbers:
[0022] 10. Punch body; 21. Head end; 22. Tail end.
[0023] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the embodiments of the present invention.
[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0026] In addition, in the embodiments of the present invention, the descriptions of "first," "second," etc. are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the embodiments of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.
[0027] In the embodiments of the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.
[0028] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the embodiments of the present invention.
[0029] The stator core, a crucial component of a motor, secures the stator windings and provides a magnetic circuit for the motor. Typically constructed from stacked stator laminations, the stator core's magnetic conductivity has a crucial influence on motor performance. However, limited by the existing structure of stator laminations, the stator core's magnetic conductivity is poor.
[0030] The inventors discovered that the central angle of existing stator laminations is relatively small, requiring more laminations to be spliced together to form the stator core. This increases the number of joints, and the air trapped in these joints creates resistance to the magnetic flux. The greater the number of joints, the greater the cumulative resistance, which negatively impacts magnetic conductivity. It also increases the stamping circumference and leads to increased core loss.
[0031] In view of this, embodiments of the present invention provide a stator lamination. By setting the central angle corresponding to the solid portion between the leading and trailing ends of a sector-shaped lamination body to be greater than 180 degrees, a stator core formed by stacking multiple stator laminations is formed. Each layer of stator laminations has only one joint, effectively reducing the number of joints and lowering the resistance of the stator core's magnetic flux passing through the joints, thereby improving the stator core's magnetic conductivity. Simultaneously, the stamping circumference is reduced, effectively reducing core losses.
[0032] In order to better understand the above technical solution, the above technical solution is described in detail below with reference to the accompanying drawings.
[0033] like Figure 1 As shown, an embodiment of the present invention provides a stator lamination, which includes a lamination body 10. Optionally, the lamination body 10 is a silicon steel sheet. The lamination body 10 is in a sector ring shape and has a head end 21 and a tail end 22 spaced apart. The central angle corresponding to the solid portion between the head end 21 and the tail end 22 is α, and α is greater than 180 degrees.
[0034] In the technical solution adopted in this embodiment, by setting the central angle corresponding to the solid portion between the head end 21 and the tail end 22 of the sector-shaped ring-shaped punch body 10 to be greater than 180 degrees, the stator core formed by stacking multiple stator punches has only one splicing seam in each layer of stator punches, effectively reducing the number of splicing seams. On the one hand, the resistance of the stator core's magnetic flux passing through the splicing seam can be reduced, thereby improving the magnetic conductivity of the stator core; on the other hand, compared with stator punches with a small central angle, the number of stator punches required for the entire stator core during splicing is reduced. For a single stator core, the number of punching times and the punching circumference during the punching process are reduced, which can improve the punching rate and production efficiency, and effectively reduce the punching cost and core loss. Since the stator core is formed by splicing multiple stator punches, and the stator core is annular, α is less than 360 degrees.
[0035] It can be understood that in the embodiment of the present application, a plurality of punching sheet bodies 10 are spliced in a spiral shape, which is similar to the spiral shape of a spring. That is to say, along the axial direction perpendicular to the stator core, two adjacent stator punching sheets are not completely on the same plane when spliced, but are partially misaligned. Since the punching sheet body 10 is a silicon steel sheet, it is relatively thin and has a certain degree of softness. When two adjacent stator punching sheets are spliced, the solid part between the head end 21 and the tail end 22 of the punching sheet body 10 will be deformed to adapt to the spiral splicing. Of course, in other embodiments, assembly structures that cooperate with each other can also be provided at the head end 21 and the tail end 22 of the punching sheet body 10 to achieve a spiral splicing form. For the convenience of description, the embodiment of the present application takes the splicing of three punching sheet bodies 10 as an example to introduce the splicing method (the same below). Reference Figure 2 and Figure 3 It can be understood that the tail end 22 of the first punch body 10 is spliced with the head end 21 of the second punch body 10, and the tail end 22 of the second punch body 10 is spliced with the head end 21 of the third punch body 10, and the head end 21 of the first punch body 10 and the tail end 22 of the third punch body 10 are in an open state. When more than three punch bodies 10 are spliced, the splicing method refers to the splicing method of the above three punch bodies 10 and will not be described in detail.
[0036] In one embodiment of the present invention, α = N * β, 2N is greater than Z, and β = 360° / Z; where N is a positive integer and Z is the number of stator slots. It is understood that the central angle corresponding to the solid portion between the leading end 21 and the trailing end 22 of the lamination body 10 is an integer multiple of the slot pitch angle (i.e., β). In this way, a complete stator slot or stator tooth can be formed at the junction of two adjacent stator laminations.
[0037] In one embodiment of the present invention, the stator lamination further includes a first assembly structure provided at the head end 21 and a second assembly structure provided at the tail end 22. The first assembly structure and the second assembly structure are located on either side of the lamination body 10. When two adjacent lamination bodies 10 are spliced together, the first assembly structure on one lamination body 10 is spliced with the second assembly structure on the other lamination body 10. In this way, the first assembly structure and the second assembly structure are staggered along the axial direction perpendicular to the stator core. That is, in the axial direction of the stator core, the first assembly structure and the second assembly structure are located on either side of the lamination body 10, thereby achieving spiral splicing of two adjacent lamination bodies 10.
[0038] In one embodiment of the present invention, one of the first assembly structure and the second assembly structure is an assembly protrusion, and the other of the second assembly structure is an assembly recess. It is understandable that, among the three punching bodies 10 spliced in sequence, the assembly protrusion on the first punching body 10 is protruding toward the second punching body 10, and the assembly recess on the second punching body 10 is recessed away from the first punching body 10; the assembly protrusion on the second punching body 10 is protruding toward the assembly protrusion on the third punching body 10, and the assembly recess on the third punching body 10 is recessed away from the second punching body 10... In this way, the splicing of two adjacent punching bodies 10 is achieved.
[0039] To achieve the above objectives, the present invention provides a stator core comprising the stator laminations described above. Specifically, the structure of the stator laminations is similar to that of the above embodiments. Since the stator core utilizes all of the technical solutions of the above embodiments, it at least possesses all of the beneficial effects brought about by the technical solutions of the above embodiments, and no further elaboration is required here.
[0040] In one embodiment of the present invention, referring to Figure 2 and Figure 3 , the stator punching sheet is provided with a plurality of, the head end 21 of a stator punching sheet is spliced with the tail end 22 of an adjacent stator punching sheet so that the multiple stator punching sheets are spirally stacked. It can be understood that the tail end 22 of the first punching sheet body 10 is spliced with the head end 21 of the second punching sheet body 10, and the tail end 22 of the second punching sheet body 10 is spliced with the head end 21 of the third punching sheet body 10... The head end 21 of the first punching sheet body 10 and the tail end 22 of the third (i.e. the last) punching sheet body 10 are in a non-closed state. In this way, when the axial magnetic flux changes, eddy currents will be formed along the circumference. Compared with the closed state, the eddy currents in this embodiment will be transmitted along the head end 21 of the first punching sheet body 10 to the tail end 22 of the last punching sheet body 10. The eddy current transmission path is longer and the resistance is smaller, thereby suppressing eddy current loss, reducing the loss of the stator core, and improving the efficiency of the motor.
[0041] In one embodiment of the present invention, the stator core further comprises a fixing structure, which connects two adjacent stator punching sheets. In this way, the two adjacent punching sheet bodies 10 can be fixedly connected together to prevent them from becoming loose.
[0042] In one embodiment of the present invention, the fixing structure is configured as an adhesive structure, a buckle point structure, or a welding structure. It is understood that the two adjacent punching bodies 10 can be fixed by adhesive bonding, connected by buckle points, or directly welded together. In specific applications, the preferred method can be selected and used, and no limitation is made here.
[0043] To achieve the above objectives, the present invention provides a motor comprising a rotor core and the stator core described above, wherein the stator core is sleeved outside the rotor core. The stator core has a specific structure similar to that of the above embodiments. Since the motor utilizes all of the technical solutions of the above embodiments, it possesses at least all of the beneficial effects brought about by the technical solutions of the above embodiments, and therefore will not be further elaborated here.
[0044] To achieve the above purpose, the embodiment of the present invention proposes a stamping device, which is used to stamp the stator punching sheet described above. The stamping device at least includes a first stamping die and a second stamping die arranged along the width direction of the material. The stator punching sheets stamped by the first stamping die and the second stamping die are arranged in a complementary manner. In this way, the material can be fully utilized and the waste of the material can be reduced. In one embodiment, referring to Figure 4 , along the width direction of the material, two rows of stamping dies (i.e., the first stamping die and the second stamping die) are arranged, the two rows of fan rings are arranged facing each other, and along the length direction of the material, the two rows of fan ring-shaped punching sheet bodies 10 are staggered, which can improve the utilization of the material inside the fan ring. In other embodiments, refer to Figure 5 , more even-numbered rows of stamping dies can be arranged, and the four rows of fan-shaped ring punching sheet bodies 10 are arranged in a staggered manner towards each other, which can further improve material utilization and reduce material costs.
[0045] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the embodiments of the present invention. All equivalent structural transformations made using the description and drawings of the embodiments of the present invention under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the embodiments of the present invention.
Claims
1. A stator punching sheet, characterized in that: The stator punching sheet includes a punching sheet body, which is in a sector ring shape and has a head end and a tail end spaced apart. The central angle of the solid part between the head end and the tail end is α, and α>180 degrees.
2. The stator sheet according to claim 1, characterized in that: α=N*β, 2N is greater than Z, β=360° / Z; wherein N is a positive integer, and Z is the number of stator slots.
3. The stator sheet according to claim 1, characterized in that: The stator punching sheet further includes a first assembly structure provided at the head end and a second assembly structure provided at the tail end, wherein the first assembly structure and the second assembly structure are located on both sides of the punching sheet body.
4. The stator sheet according to claim 3, characterized in that: One of the first assembly structure and the second assembly structure is an assembly convex portion, and the other of the second assembly structure is an assembly concave portion.
5. A stator core, characterized in that: The stator core includes the stator punching sheet according to any one of claims 1 to 4.
6. The stator core according to claim 5, wherein: There are a plurality of stator punching sheets, and the head end of one stator punching sheet is spliced with the tail end of an adjacent stator punching sheet so that the plurality of stator punching sheets are stacked in a spiral shape.
7. The stator core according to claim 6, wherein: The stator core further includes a fixing structure, which connects two adjacent stator punching sheets.
8. The stator core according to claim 7, wherein: The fixing structure is configured as a bonding structure, a buckle point structure or a welding structure.
9. A motor, characterized in that: The motor comprises a rotor core and a stator core according to any one of claims 5 to 8, wherein the stator core is sleeved on the outside of the rotor core.
10. A punching device, characterized in that: The stamping device is used to stamp the stator punching sheet according to any one of claims 1 to 4, and the stamping device comprises at least a first stamping die and a second stamping die arranged along the width direction of the material, and the stator punching sheets stamped by the first stamping die and the second stamping die are arranged in a complementary manner.