Stator punching sheet structure

Abstract

The invention relates to a stator punching sheet structure, which comprises three groups of arc-shaped annular punching sheet bodies and a circle of convex teeth integrally formed on the inner side wall of each group of punching sheet bodies, two radial tangent planes of each group of punching sheet bodies are splicing end surfaces, a dovetail trapezoidal tenon I is integrally formed on one splicing end surface, and a dovetail trapezoidal tenon II is integrally formed on the other splicing end surface. The other splicing end face is provided with a first dovetail trapezoid groove matched with the first dovetail trapezoid tenon. The three sets of punching sheet bodies are spliced into a whole circle through interference fit of the first dovetail trapezoid tenon and the first dovetail trapezoid groove. According to the invention, the three groups of arc-shaped punching sheet bodies are spliced into a complete circular stator structure through the interference fit of the first dovetail trapezoidal tenons and the first dovetail trapezoidal grooves, and fit positioning of the reference pins on the inner walls of the L-shaped arc blocks and the positioning blind holes is matched; and the L-shaped arc blocks are in interference fit with the dovetail trapezoidal grooves II in the side surfaces of the punching sheet bodies through the dovetail trapezoidal tenons II, so that the coaxiality error of the three groups of spliced punching sheet bodies is reduced.

Description

A stator lamination structure Technical Field

[0001] This application relates to the field of electrical equipment, and in particular to a stator lamination structure. Background Technology

[0002] Currently, stator laminations, as a core component of motors, are typically formed by laminating silicon steel sheets, and their structure directly affects the motor's energy efficiency and operational stability. Traditional stator laminations mostly employ a uniformly distributed tooth and slot design, fixed to the housing via keyways or welding. However, as industrial equipment develops towards higher power density, existing stator laminations face new challenges in addressing thermal stress concentration, mechanical strength, and assembly compatibility.

[0003] Regarding the aforementioned technologies, the inventors believe that: in the existing technologies, the stator lamination splicing lacks a precise positioning benchmark and a reliable mating structure, making it difficult to control the mating gap, resulting in cumbersome splicing operations, difficulty in centering, and easy coaxiality deviation after splicing, which affects assembly efficiency and overall structural stability. Summary of the Invention

[0004] In order to address the lack of precise positioning references and reliable mating structures in the existing technology for stator lamination splicing, which makes it difficult to control the mating gap, resulting in cumbersome splicing operations, high centering difficulty, and easy coaxiality deviation after splicing, thus affecting assembly efficiency and overall structural stability, this application provides a stator lamination structure.

[0005] The stator lamination structure provided in this application adopts the following technical solution: A stator lamination structure includes three sets of arc-shaped ring lamination bodies, and a ring of protruding teeth integrally formed on the inner side wall of each set of lamination bodies. The two radial cross-sections of each set of lamination bodies are splicing end faces. One splicing end face has an integrally formed dovetail trapezoidal tenon, and the other splicing end face has a dovetail trapezoidal groove adapted to the dovetail trapezoidal tenon. The three sets of lamination bodies are spliced ​​into a complete circle through an interference fit between the dovetail trapezoidal tenon and the dovetail trapezoidal groove. The bottom end face of each lamination body has a downward-opening trapezoidal groove, and the side surface of the lamination body has a dovetail trapezoidal groove. The second groove has two sets of positioning blind holes on the surface of the lamination body, and a reference pin is provided inside the positioning blind hole. An L-shaped arc block is integrally formed on the surface of the reference pin. A dovetail trapezoidal tenon is integrally formed on the inner wall of the L-shaped arc block. An inclined block is integrally formed on the top surface of the protruding tooth, and an inclined groove is provided on the bottom surface of the protruding tooth. A rectangular anti-misalignment protrusion is integrally formed on the upper overlapping end face of the lamination body and the yoke area between the protruding teeth. A rectangular anti-misalignment groove that matches the anti-misalignment protrusion is provided on the bottom end face of the adjacent lamination body at the corresponding position. A trapezoidal limiting platform is protruded on both sides of the protruding tooth along the tooth height direction. The thickness of the trapezoidal limiting platform is the same as the thickness of the protruding tooth.

[0006] Optionally, the outer surface of the L-shaped arc block is fitted with the inner wall of the trapezoidal groove formed by the corresponding positions of the two sets of stamping bodies after splicing, forming a snap-fit ​​positioning. The L-shaped arc block is a magnetic structure, integrally formed with the stamping body and made of the same material. The inner side of the L-shaped arc block is completely fitted with the radial surface and outer circumferential surface of the stamping body, respectively, and the outer side is an arc surface concentric with the stamping body.

[0007] By adopting the above technical solution, the precise snap-fit ​​positioning of the stamping body after splicing is directly achieved by using the fitting structure of the L-shaped arc block and the inner wall of the trapezoidal groove and the integrated molding design. The inner side is fully fitted to ensure the maximum contact area, the concentric arc surface of the outer side ensures the coaxiality with the stamping body, and the magnetic conductive structure ensures the continuity of the magnetic circuit.

[0008] Optionally, the positioning blind hole penetrates vertically through the trapezoidal inclined surface of the dovetail trapezoidal tenon and is parallel to the axis of the stamping body. The two sets of positioning blind holes are symmetrically distributed along the axial direction of the dovetail trapezoidal tenon.

[0009] By adopting the above technical solution, and with the help of the vertical through-hole design, the orientation feature parallel to the axis, and the axially symmetrical distribution structure, a two-way positioning reference is directly provided for the splicing of the laminations. The symmetrical distribution ensures balanced force during assembly, and the vertical through-hole structure facilitates the quick insertion of the positioning pin.

[0010] Optionally, the trapezoidal surface of the second dovetail trapezoidal protrusion is interference-fitted with the inner wall of the second dovetail trapezoidal groove, with a fitting gap ≤0.02mm.

[0011] By adopting the above technical solution, relying on the interference fit structure of the dovetail trapezoidal protrusion and groove 2 and the control of the fitting gap of ≤0.02mm, the fitting gap is directly eliminated to achieve tight fitting. The interference structure restricts the axial displacement of the stamping, indirectly improving the splicing stability of the stamping assembly, avoiding loosening during long-term operation, and reducing component wear caused by vibration.

[0012] Optionally, the width of the first dovetail trapezoidal groove is 0.02-0.03mm smaller than the width of the first dovetail trapezoidal tenon, forming an interference fit, and the coaxiality error of the three sets of stamping bodies after splicing is ≤0.03mm.

[0013] By adopting the above technical solution, the 0.02-0.03mm width difference between the groove and the tenon forms an interference fit, which directly generates an assembly preload to ensure that the tenon and the groove are tightly engaged. After splicing, the coaxiality error of ≤0.03mm achieves precise centering, indirectly improving the rotation accuracy of the stamping assembly, reducing eccentric vibration, reducing transmission energy loss, and enhancing operational stability.

[0014] Optionally, the inclined block is integrally formed on the top surface of the protruding tooth, with the inclined surface facing the stamping body. The groove shape of the inclined slot is adapted to the inclined block. When adjacent stampings are stacked, the inclined block of the upper protruding tooth is embedded in the inclined groove of the lower protruding tooth to form a tooth stacking limit and prevent circumferential movement.

[0015] By adopting the above technical solution, the overlapping structure of the inclined block integrally formed on the top surface of the convex tooth and the matching inclined groove directly realizes the mechanical limiting of adjacent stamping teeth. The matching method of the inclined block embedded in the inclined groove directly blocks circumferential movement, indirectly enhances the reliability of tooth connection, avoids relative rotation under torque, and extends the service life of stamping assembly.

[0016] Optionally, the axial length of the dovetail trapezoidal tenon II is consistent with the axial length of the longitudinal side of the L-shaped arc block, and is the same as the thickness of the stamping body.

[0017] By adopting the above technical solution, based on the design that the axial length of the second tenon and the longitudinal edge of the L-shaped arc block are consistent and the thickness is the same as that of the stamping body, it is directly ensured that the axial force of each positioning structure is uniform, and the synchronous fitting during assembly avoids local force concentration, which indirectly improves the structural symmetry of the stamping assembly, reduces assembly deviation, and enhances dynamic balance performance.

[0018] Optionally, the trapezoidal limiting platform is located on the tooth side surface of the convex tooth, near the root chamfer area where the convex tooth connects to the stamping body. The short side of the trapezoid is perpendicularly connected to the tooth side surface of the convex tooth, and the long side of the trapezoid is in contact with the inner wall of the stamping body. The thickness of the trapezoidal limiting platform is the same as the thickness of the convex tooth. The trapezoidal limiting platform is misaligned with the inclined block on the top surface of the convex tooth and the inclined groove on the bottom surface of the tooth.

[0019] By adopting the above technical solution, the precise engagement of the rectangular anti-misalignment protrusion and the rectangular anti-misalignment groove directly avoids the problem of reverse assembly during assembly. The trapezoidal limiting platform, with its specific position and shape design, can limit and fix the wires in the winding slots between the protrusions without interfering with the inclined blocks and inclined slots, thus directly preventing the winding wires from loosening and shifting.

[0020] In summary, this application includes at least one of the following beneficial technical effects: three sets of arc-shaped lamination bodies are spliced ​​into a complete circular stator structure through an interference fit between a dovetail trapezoidal protrusion and a dovetail trapezoidal groove, which, together with the reference pin on the inner wall of the L-shaped arc block and the positioning blind hole, and the interference fit between the L-shaped arc block and the dovetail trapezoidal groove on the side surface of the lamination body through a dovetail trapezoidal protrusion, ensures that the coaxiality error of the three sets of lamination bodies after splicing is ≤0.03mm. The arc-shaped block, as a magnetic guiding structure, is made of the same material as the lamination body. It can supplement the magnetic circuit at the splicing point and prevent the magnetic circuit from breaking. The high-precision positioning of the splicing structure reduces the concentricity deviation between the stator and rotor. The continuity of the magnetic circuit reduces the magnetic loss during motor operation, thereby ensuring the stability and energy efficiency of motor operation. During lamination, the inclined block on the top surface of the convex tooth of the upper lamination body is embedded in the inclined groove on the bottom surface of the convex tooth of the lower lamination body to form a mechanical limit. The rectangular anti-misalignment protrusions on the lamination body and the yoke area between the convex teeth precisely engage with the rectangular anti-misalignment grooves on the bottom end face of the adjacent lamination body, which can directly prevent circumferential movement and reverse assembly during the lamination process. After the winding is embedded in the winding slot between the convex teeth, the trapezoidal limiting platform (distributed in a staggered manner with the inclined block and inclined groove) on the side of the convex tooth and near the root chamfer area fits against the inner wall of the lamination body and is consistent with the thickness of the convex tooth, which can precisely limit the winding wire to prevent loosening. Attached Figure Description

[0021] Figure 1 is a schematic diagram of a preferred embodiment of a stator lamination structure according to an embodiment of this application; Figure 2 is a top view of this application; Figure 3 is a bottom view of this application; Figure 4 is an enlarged view of point A in Figure 3.

[0022] The following are the labeling elements in the diagram: 1. Stamp body; 101. Dovetail trapezoidal tenon one; 102. Dovetail trapezoidal groove one; 103. Trapezoidal groove; 104. Dovetail trapezoidal groove two; 105. Positioning blind hole; 106. Reference pin; 107. L-shaped arc block; 108. Dovetail trapezoidal tenon two; 109. Inclined block; 110. Inclined groove; 111. Anti-misalignment protrusion; 112. Rectangular anti-misalignment groove; 113. Trapezoidal limiting platform; 2. Convex tooth. Detailed Implementation

[0023] The present application will be further described in detail below with reference to Figures 1-4.

[0024] This application discloses a stator lamination structure. Referring to Figures 1-4, a stator lamination structure includes three sets of arc-shaped annular lamination bodies 1, and a ring of protruding teeth 2 integrally formed on the inner sidewall of each set of lamination bodies 1. Each set of lamination bodies 1 has two radial cross-sections that are splicing end faces. One splicing end face has an integrally formed dovetail trapezoidal tenon 101, and the other splicing end face has a dovetail trapezoidal groove 102 adapted to the dovetail trapezoidal tenon 101. The three sets of lamination bodies 1 are spliced ​​into a complete circle through an interference fit between the dovetail trapezoidal tenon 101 and the dovetail trapezoidal groove 102. The bottom end face of the lamination body 1 has a downward-opening trapezoidal groove 103, and the side surface of the lamination body 1 has a dovetail trapezoidal groove 104. The surface of the lamination body 1 has two sets of positioning blind holes 105, and the interior of the positioning blind holes 105 has a reference pin 106. The surface of the reference pin 106 has an L-shaped arc block 107 integrally formed. The inner wall of the L-shaped arc block 107 is integrally formed with a dovetail trapezoidal protrusion 108. The tooth top surface of the protrusion 2 is integrally formed with a slanted block 109, and the bottom surface of the protrusion 2 is provided with a slanted groove 110. The upper overlapping end face of the stamping body 1 and the yoke area between the protrusion 2 are integrally formed with a rectangular anti-misalignment protrusion 111. The bottom end face of the adjacent stamping body 1 is provided with a rectangular anti-misalignment groove 112 that matches the anti-misalignment protrusion 111. Both tooth sides of the protrusion 2 are provided with a trapezoidal limiting platform 113 along the tooth height direction. The thickness of the trapezoidal limiting platform 113 is the same as the thickness of the protrusion 2.

[0025] The outer surface of the L-shaped arc block 107 fits into the inner wall of the trapezoidal groove 103 formed by the corresponding positions of the two sets of lamination bodies 1 after splicing, forming a snap-fit ​​positioning. The L-shaped arc block 107 is a magnetic structure, integrally formed with the lamination body 1 and made of the same material. The inner side of the L-shaped arc block 107 is completely fitted into the radial surface and outer circumferential surface of the lamination body 1, respectively, and the outer side is an arc surface concentric with the lamination body 1.

[0026] The positioning blind hole 105 penetrates vertically through the trapezoidal inclined surface of the dovetail trapezoidal protrusion 101 and is parallel to the axis of the stamp body 1. The two sets of positioning blind holes 105 are symmetrically distributed along the axis of the dovetail trapezoidal protrusion 101.

[0027] The trapezoidal surface of the dovetail trapezoidal protrusion 108 is interference-fitted with the inner wall of the dovetail trapezoidal groove 104, with a fitting gap ≤0.02mm.

[0028] The width of the dovetail trapezoidal groove 102 is 0.02-0.03mm smaller than the width of the dovetail trapezoidal tenon 101, forming an interference fit. After splicing, the coaxiality error of the three sets of stamping bodies 1 is ≤0.03mm.

[0029] The inclined block 109 is integrally formed on the top surface of the tooth 2, with the inclined surface facing the stamp body 1. The groove shape of the inclined groove 110 is adapted to the inclined block 109. When adjacent stamps are stacked, the inclined block 109 of the upper tooth 2 is embedded in the inclined groove 110 of the lower tooth 2 to form a tooth stacking limit and prevent circumferential movement.

[0030] The axial length of the dovetail trapezoidal protrusion 108 is consistent with the longitudinal side axial length of the L-shaped arc block 107, and is the same as the thickness of the stamping body 1.

[0031] The trapezoidal limiting platform 113 is located on the tooth side surface of the protruding tooth 2, near the root chamfer area where the protruding tooth 2 connects to the stamping body 1. The short side of the trapezoid is perpendicularly connected to the tooth side surface of the protruding tooth 2, and the long side of the trapezoid is in contact with the inner wall of the stamping body 1. The thickness of the trapezoidal limiting platform 113 is the same as the thickness of the protruding tooth 2. The trapezoidal limiting platform 113 is staggered with the inclined block 109 on the top surface of the protruding tooth 2 and the inclined groove 110 on the bottom surface of the tooth 2.

[0032] The implementation principle of a cardboard conveyor according to an embodiment of this application is as follows: three sets of arc-shaped punch bodies 1 are spliced ​​together to form a complete circular stator structure through an interference fit between dovetail trapezoidal protrusion 101 and dovetail trapezoidal groove 102. During the splicing process, the L-shaped arc block 107 is interference-fitted with the dovetail trapezoidal protrusion 108 on its inner wall and the dovetail trapezoidal groove 104 on the side surface of the punch body 1. The reference pin 106 on the inner wall of the L-shaped arc block 107 fits with the positioning blind hole 105, and the outer surface of the L-shaped arc block 107 fits with the inner wall of the trapezoidal groove 103 formed after the splicing of the two sets of punch bodies 1 to achieve locking and positioning. At the same time, the L-shaped arc block 107... The arc block 107 serves as a magnetic conductor to supplement the magnetic circuit at the splice. During stacking, the inclined block 109 on the top surface of the tooth 2 of the upper lamination body 1 is embedded in the inclined groove 110 on the bottom surface of the tooth 2 of the lower lamination body 1 to form a limit. The rectangular anti-misalignment protrusion 111 on the stacked end face of the lamination body 1 and the yoke area between the tooth 2 engages with the rectangular anti-misalignment groove 112 on the bottom end face of the adjacent lamination body 1 to avoid reverse assembly. After the winding is embedded in the winding slot between the tooth 2, the trapezoidal limiting platform 113 on the tooth side and near the root chamfer area of ​​the tooth 2 (distributed in a staggered manner with the inclined block 109 and the inclined groove 110) realizes the limiting and fixing of the winding wire. After energization, the magnetic field generated by the winding forms a closed magnetic circuit through the tooth 2 and the yoke of the lamination body 1, driving the rotor to run stably.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A stator lamination structure, characterized in that: The system includes three sets of arc-shaped ring-shaped stamped bodies (1), and a ring of protruding teeth (2) integrally formed on the inner sidewall of each set of stamped bodies (1). The two radial cross-sections of each set of stamped bodies (1) are splicing end faces. One splicing end face is integrally formed with a dovetail trapezoidal tenon (101), and the other splicing end face is provided with a dovetail trapezoidal groove (102) adapted to the dovetail trapezoidal tenon (101). The three sets of stamped bodies (1) are spliced ​​into a complete circle by the interference fit between the dovetail trapezoidal tenon (101) and the dovetail trapezoidal groove (102). The bottom end face of the stamped body (1) is provided with a downward-opening trapezoidal groove (103), and the side surface of the stamped body (1) is provided with a dovetail trapezoidal groove (104). The surface of the stamped body (1) is provided with two sets of positioning blind holes (105), and the positioning blind holes are provided with two sets of positioning blind holes (105). The hole (105) is provided with a reference pin (106). The surface of the reference pin (106) is integrally formed with an L-shaped arc block (107). The inner wall of the L-shaped arc block (107) is integrally formed with a dovetail trapezoidal tenon (108). The tooth top surface of the tooth (2) is integrally formed with a slant block (109). The bottom surface of the tooth (2) is provided with a slant groove (110). The upper overlapping end face of the stamping body (1) and the yoke area between the tooth (2) are integrally formed with a rectangular anti-mistake protrusion (111). The bottom end face of the adjacent stamping body (1) is provided with a rectangular anti-mistake groove (112) that matches the anti-mistake protrusion (111). The two tooth sides of the tooth (2) are provided with a trapezoidal limiting platform (113) along the tooth height direction. The thickness of the trapezoidal limiting platform (113) is the same as the thickness of the tooth (2).

2. The stator lamination structure according to claim 1, characterized in that: The outer surface of the L-shaped arc block (107) fits into the inner wall of the trapezoidal groove (103) formed by the corresponding positions of the two sets of stamping bodies (1) to form a snap-fit ​​positioning. The L-shaped arc block (107) is a magnetic structure, integrally formed with the stamping body (1) and of the same material. The inner side of the L-shaped arc block (107) is completely fitted with the radial surface and outer circumferential surface of the stamping body (1) respectively, and the outer side is an arc surface concentric with the stamping body (1).

3. The stator lamination structure according to claim 1, characterized in that: The positioning blind hole (105) penetrates vertically through the trapezoidal inclined surface of the dovetail trapezoidal tenon (101) and is parallel to the axis of the punch body (1). The two sets of positioning blind holes (105) are symmetrically distributed along the axis of the dovetail trapezoidal tenon (101).

4. The stator lamination structure according to claim 1, characterized in that: The trapezoidal surface of the second dovetail trapezoidal tenon (108) is interference-fitted with the inner wall of the second dovetail trapezoidal groove (104), with a fitting gap of ≤0.02mm.

5. A stator lamination structure according to claim 1, characterized in that: The width of the dovetail trapezoidal groove (102) is 0.02-0.03 mm smaller than the width of the dovetail trapezoidal tenon (101), forming an interference fit. After splicing, the coaxiality error of the three sets of stamping bodies (1) is ≤0.03 mm.

6. A stator lamination structure according to claim 1, characterized in that: The inclined block (109) is integrally formed on the top surface of the tooth (2), with the inclined surface facing the stamp body (1). The groove shape of the inclined groove (110) is adapted to the inclined block (109). When adjacent stamps are stacked, the inclined block (109) of the upper tooth (2) is embedded in the inclined groove (110) of the lower tooth (2) to form a tooth stacking limit and prevent circumferential movement.

7. A stator lamination structure according to claim 1, characterized in that: The axial length of the dovetail trapezoidal tenon 2 (108) is consistent with the longitudinal side axial length of the L-shaped arc block (107) and is the same as the thickness of the stamping body (1).

8. A stator lamination structure according to claim 1, characterized in that: The trapezoidal limiting platform (113) is located on the tooth side surface of the convex tooth (2) and near the root chamfer area where the convex tooth (2) connects to the stamping body (1). The short side of the trapezoid is perpendicularly connected to the tooth side surface of the convex tooth (2), and the long side of the trapezoid is in contact with the inner wall of the stamping body (1). The thickness of the trapezoidal limiting platform (113) is the same as the thickness of the convex tooth (2). The trapezoidal limiting platform (113) is misaligned with the inclined block (109) on the top surface of the convex tooth (2) and the inclined groove (110) on the bottom surface of the tooth.

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