Transformer iron core
By setting waist-shaped process holes on the transformer core, with the length direction aligned with the magnetic field lines, and combining this with precise positioning pins, the problem of magnetic flux offset caused by the process holes was solved, thus improving the core's performance and manufacturing efficiency.
Patent Information
- Application Number
- CN202520634846.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2035-04-03
AI Technical Summary
In traditional transformer core manufacturing, process holes cause deformation at the edges of the punched silicon steel sheets, altering the magnetic flux flow path and increasing excitation losses, making it difficult to meet the requirements of high-quality and high-efficiency manufacturing.
The process uses a waist-shaped hole, with its length direction aligned with the magnetic field lines of the iron chip, to reduce magnetic field line offset. Combined with positioning pins, this achieves precise positioning of the iron chip and neat stacking.
This reduces no-load losses, improves the magnetic properties and mechanical strength of the iron core, and enables efficient iron core manufacturing.
Smart Images
Figure CN223977770U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of transformer technology, and in particular to a transformer core. Background Technology
[0002] The lamination process of transformer cores is a crucial step in transformer manufacturing, directly affecting the magnetic properties, mechanical strength, and loss characteristics of the core. Silicon steel sheets are selected and punched according to the transformer design requirements. The punched silicon steel sheets are then assembled in a specific lamination pattern to form the transformer core. During the lamination process, gaps or misalignments between the silicon steel sheets must be avoided to ensure the continuity and uniformity of the magnetic circuit.
[0003] Traditional transformer core manufacturing typically employs a template method for manual lamination, which is cumbersome, inefficient, and fails to meet the high-quality and high-efficiency manufacturing requirements of transformer cores.
[0004] With the development of automated and intelligent manufacturing technology for transformer cores, technologies and equipment for automated lamination using robotic arms or lamination arms have emerged and are being applied. However, to ensure the quality and efficiency of core lamination, process holes need to be set on the core for pin-threading lamination. During the processing of these process holes, the edges of the silicon steel sheets deform due to mechanical stress, leading to a decrease in local permeability. Simultaneously, the magnetic flux flow path is altered by the presence of the process holes, requiring additional excitation losses to maintain magnetic circuit operation. Since magnetic flux always flows in the direction that minimizes the magnetic field energy of the core, when the flux is forced through the confined area created by the process holes, the magnetic field lines shift caused by deformation at the punched edges lead to a significant increase in local magnetic flux density, further increasing core losses.
[0005] In view of this, based on years of experience in production and design in this and related fields, the inventor has designed a transformer core through repeated experiments in order to solve the problems existing in the prior art. Utility Model Content
[0006] The purpose of this invention is to provide a transformer core that can effectively reduce the impact of process holes on no-load losses.
[0007] To achieve the above objectives, this utility model proposes a transformer core, wherein the transformer core is composed of multiple stacked iron chips, and each iron chip has multiple process holes aligned with each other. Each process hole is waist-shaped, and the long side of each process hole is arranged along the magnetic field line direction of the iron chip.
[0008] In the transformer core described above, the process hole is an oblong hole.
[0009] In the transformer core described above, the length of the process hole is twice the width of the process hole.
[0010] In the transformer core described above, the length of the process hole is 16mm and the width of the process hole is 8mm.
[0011] The transformer core described above includes an upper yoke, a lower yoke, a middle section, and two side sections, which together form a U-shaped structure.
[0012] In the transformer core described above, at least one process hole is provided in the upper yoke, the lower yoke, and the side portion.
[0013] In the transformer core described above, the upper yoke, the lower yoke, and the edge are all provided with two process holes spaced apart.
[0014] In the transformer core described above, the process hole is located on the centerline of the upper yoke, the centerline of the lower yoke, or the centerline of the edge.
[0015] The transformer core described above, wherein the iron core sheet is a silicon steel sheet.
[0016] Compared with the prior art, the present invention has the following features and advantages:
[0017] The transformer core proposed in this utility model sets the process holes used for positioning on each iron chip as waist holes, and makes the length direction of the process holes consistent with the magnetic field line direction of the iron chip, thereby reducing the magnetic field line offset and reducing no-load loss.
[0018] The transformer core proposed in this utility model has iron chips that can better cooperate with robotic arms. Each iron chip is picked up by the robotic arm and placed in a predetermined position. The predetermined position is provided with a positioning pin that aligns with the process hole. The positioning pin passes through the corresponding process hole to achieve precise positioning of the iron chip and ensure neat stacking. Attached Figure Description
[0019] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.
[0020] Figure 1 This is a schematic diagram of the iron chip proposed in this utility model;
[0021] Figure 2This is a schematic diagram of the process hole in this utility model.
[0022] Explanation of reference numerals in the attached figures
[0023] 10. Iron chip; 11. Upper yoke;
[0024] 12. Lower yoke; 13. Middle part;
[0025] 14. Edge; 20. Process hole;
[0026] O1, center line; O2, center line;
[0027] O3, centerline; L1, length;
[0028] L2, width. Detailed Implementation
[0029] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.
[0030] Unless otherwise defined, the directions such as up, down, left, and right mentioned in this document refer to those shown in this utility model. Figure 1 The directions of up, down, left, and right are used as a reference, and will be explained here.
[0031] like Figure 1 and Figure 2 As shown, this utility model proposes a transformer core, which is composed of multiple iron chips 10 stacked together. Each iron chip 10 has multiple process holes 20 aligned on it. Each process hole 20 is waist-shaped and its long side is arranged along the magnetic field line direction of the iron chip 10.
[0032] The transformer core proposed in this utility model sets the process holes 20 used for positioning on each iron chip 10 as waist holes, and makes the length direction of the process holes 20 consistent with the magnetic field line direction of the iron chip, thereby reducing the magnetic field line offset and reducing no-load loss.
[0033] The transformer core proposed in this utility model has a core chip 10 that can better cooperate with a robotic arm (or stacking arm). Each core chip 10 is picked up by the robotic arm and placed in a predetermined position. The predetermined position is provided with a positioning pin that aligns with the process hole 20. The positioning pin passes through the corresponding process hole 20 to achieve precise positioning of the core chip 10 and ensure neat stacking.
[0034] In one optional embodiment of this utility model, the process hole 20 is an oblong hole.
[0035] In one optional embodiment of this utility model, the length L1 of the process hole 20 is twice the width L2 of the process hole, so as to reduce the influence of the width of the process hole 20 on the magnetic field line offset and further reduce the no-load loss.
[0036] Furthermore, the length L1 of the process hole 20 is 16mm, and the width L2 of the process hole 20 is 8mm. While meeting the requirements of the process application, the size of the process hole 20 is made as small as possible to reduce its impact on the core performance.
[0037] In one optional embodiment of the present invention, the iron chip 10 includes an upper yoke 11, a lower yoke 12, a middle part 13 and two side parts 14, which together form a sun-shaped structure.
[0038] In an optional example of this embodiment, the upper yoke 11, the lower yoke 12 and the side 14 are each provided with at least one process hole 20 to ensure the positioning accuracy of the iron chip 10.
[0039] Furthermore, the upper yoke 11, the lower yoke 12, and the side 14 are each provided with two process holes 20 at intervals.
[0040] In an alternative example, the process hole 20 is located on the center line O1 of the upper yoke 11, the center line O2 of the lower yoke 12, or the center line O3 of the edge 14, to further reduce the effect of the process hole 20 on the magnetic field line offset.
[0041] In an optional example of this embodiment, a process hole 20 is also provided on the middle part 13.
[0042] Furthermore, two process holes 20 are spaced apart on the center line of the middle part 13.
[0043] In one optional embodiment of this invention, the iron chip 10 is a silicon steel sheet. Of course, the iron chip 10 can also be made of magnetic materials such as amorphous alloys and nanocrystalline alloys.
[0044] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.
Claims
1. A transformer core, characterized by The transformer core is stacked by a plurality of core pieces, a plurality of process holes are arranged on each core piece in a positionally correct manner, each process hole is in the shape of a waist hole, and the long side direction of each process hole is arranged along the magnetic induction line direction of the core piece.
2. The transformer core of claim 1, wherein, The process hole is a long circular hole.
3. The transformer core of claim 2, wherein, The length of the process hole is 2 times the width of the process hole.
4. The transformer core of claim 3, wherein, The length of the process hole is 16 mm, and the width of the process hole is 8 mm.
5. The transformer core of claim 1, wherein, The core piece comprises an upper yoke part, a lower yoke part, an intermediate part and two side parts, and the upper yoke part, the lower yoke part, the intermediate part and the two side parts form a day shape structure.
6. The transformer core of claim 5, wherein, The upper yoke part, the lower yoke part and the side part are each provided with at least one process hole.
7. The transformer core of claim 6, wherein The upper yoke part, the lower yoke part and the side part are each provided with two process holes at intervals.
8. The transformer core of claim 6, wherein, The process hole is located on the center line of the upper yoke part, the center line of the lower yoke part or the center line of the side part.
9. The transformer core of claim 5, wherein, The intermediate part is provided with at least one process hole.
10. The transformer core of claim 1, wherein, The core piece is a silicon steel sheet.