Nanocrystal magnetic core for high-precision miniature mutual inductor
By using a ring-shaped protective shell and reinforcing ring to protect the nanocrystalline magnetic core in the miniature current transformer, the problem of core deformation during winding is solved, ensuring high precision and practicality.
Patent Information
- Application Number
- CN202423266517.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-12-30
AI Technical Summary
The nanocrystalline magnetic core of existing high-precision miniature current transformers is prone to deformation during the winding process, which leads to changes in permeability, magnetic loss and magnetic flux, affecting accuracy, and the winding may also scratch the magnetic core.
The nanocrystalline magnetic core is protected by an annular protective shell and annular reinforcing rings. The annular reinforcing rings are spaced apart along the axial direction of the magnetic core ring to enhance the structural strength, resist the radial extrusion force during the winding process, and avoid deformation.
It effectively protects the nanocrystalline magnetic core, maintains the accuracy and structural integrity of the miniature transformer, avoids deformation and scratches during winding, and improves practicality.
Smart Images
Figure CN223712575U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of micro transformer technology, specifically relating to a nanocrystalline magnetic core for a high-precision micro transformer. Background Technology
[0002] Miniature instrument transformers are miniaturized instrument transformers typically used for measuring and isolating low-current signals. They are very common in a variety of electronic devices, sensors, control systems, and power electronics applications. Miniature instrument transformers are designed and function similarly to traditional instrument transformers, but are smaller and lighter, making them suitable for applications with strict space and weight requirements.
[0003] In existing technologies, to ensure the high precision of miniature current transformers, their magnetic cores are typically made of nanocrystalline material, a soft magnetic material with high permeability and low loss. When nanocrystalline magnetic rings are used, subsequent winding is required. However, nanocrystalline magnetic rings deform under pressure. During actual winding, deformation often occurs due to the pressure from the drive rollers in the winding module (mainly along the radial direction of the magnetic core). Furthermore, the core is bound by the winding mechanism after winding and may not be able to return to its original shape. This leads to changes in permeability, magnetic loss, and magnetic flux, directly affecting the accuracy of the miniature current transformer. Moreover, the winding process may also damage the magnetic core. Utility Model Content
[0004] This utility model provides a nanocrystalline magnetic core for a high-precision miniature current transformer, which aims to solve the problem of poor practicality of existing high-precision miniature current transformers due to the easy deformation of the nanocrystalline magnetic cores used.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a high-precision nanocrystalline magnetic core for a micro transformer, including a magnetic core ring and an annular protective shell enclosing the magnetic core ring therein;
[0006] The outer circumferential surface of the annular protective shell is provided with at least two annular reinforcing rings, and each annular reinforcing ring is spaced apart along the axial direction of the magnetic core ring.
[0007] In one possible implementation, two annular reinforcing rings are provided, and the two annular reinforcing rings are respectively embedded at both ends of the annular protective shell along the axial direction of the magnetic core ring.
[0008] In one possible implementation, the outer diameter of each of the annular reinforcing rings is larger than the outer diameter of the annular protective shell.
[0009] In one possible implementation, each of the annular reinforcing rings has a rounded corner structure at its outermost edge.
[0010] In one possible implementation, the annular protective shell includes:
[0011] The upper shell has a first annular open cavity; the outer peripheral surface of the upper shell is provided with a first connecting structure, and the inner sidewall of the upper shell is provided with a second connecting structure;
[0012] The lower housing has a second annular opening corresponding to the first annular opening, the second annular opening being used to combine with the first annular opening to form an annular cavity for placing the magnetic core ring; the outer peripheral surface of the lower housing is provided with a third connecting structure adapted to the first connecting structure, and the inner hole sidewall of the lower housing is provided with a fourth connecting structure adapted to the second connecting structure.
[0013] In one possible implementation, the first connecting structure and the second connecting structure have the same structure, both including a plurality of spring pieces spaced apart around the axis of the upper housing, one end of each spring piece extending out of the opening of the first annular opening along the axial direction of the upper housing, and a hook is provided at the protruding end of each spring piece;
[0014] The third connection structure and the fourth connection structure are the same, both including multiple slots that are spaced apart in an annular arrangement around the axis of the lower housing.
[0015] In one possible implementation, the outer peripheral surface and the inner sidewall of the upper housing are provided with a plurality of first grooves for accommodating each of the spring pieces;
[0016] The outer peripheral surface and inner hole sidewall of the lower housing are provided with a plurality of second grooves for each of the spring pieces to extend into; the bottom surface of each groove is provided with a slot.
[0017] In one possible implementation, each of the slots is provided with a beveled structure for the hook to contact.
[0018] In this implementation, the annular protective shell ensures that the magnetic core ring is enclosed within it, thus protecting it. Multiple annular reinforcing rings on the outer circumference of the protective shell further enhance its structural strength, effectively resisting radial pressure from the drive rollers and preventing deformation of the magnetic core ring. The structure is simple, avoids affecting the accuracy of the miniature transformer, and is highly practical. Attached Figure Description
[0019] Figure 1 An exploded structural diagram of a high-precision miniature current transformer nanocrystalline magnetic core provided for an embodiment of this utility model;
[0020] Figure 2 A schematic diagram of the split structure of the annular protective shell of the nanocrystalline magnetic core for the high-precision miniature current transformer provided in this embodiment of the utility model;
[0021] Figure 3 A cross-sectional view of the nanocrystalline magnetic core for a high-precision miniature current transformer provided in this embodiment of the present invention;
[0022] Figure 4 for Figure 3 The diagram shows an enlarged view of point A of the nanocrystalline magnetic core used in the high-precision miniature current transformer.
[0023] Figure 5 A schematic diagram of the assembly structure of a nanocrystalline magnetic core for a high-precision miniature current transformer provided in this embodiment of the utility model;
[0024] Explanation of reference numerals in the attached figures:
[0025] 10. Magnetic core ring; 20. Environmentally friendly protective shell; 21. Upper shell; 211. First annular open cavity; 22. Lower shell; 221. Second annular open cavity; 23. First connecting structure; 24. Second connecting structure; 241. Spring piece; 242. Hook; 25. Third connecting structure; 26. Fourth connecting structure; 261. Slot; 262. Angled structure; 30. Annular reinforcing ring; 31. Rounded corner structure. Detailed Implementation
[0026] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0027] Please refer to the following: Figure 1 , Figure 2 and Figure 5 The present invention will now describe the high-precision nanocrystalline magnetic core for a miniature current transformer. The high-precision nanocrystalline magnetic core for a miniature current transformer includes a core ring 10 and an annular protective shell enclosing the core ring 10. At least two annular reinforcing rings 30 are provided on the outer circumferential surface of the annular protective shell, and each annular reinforcing ring 30 is spaced apart along the axial direction of the core ring 10.
[0028] The high-precision nanocrystalline magnetic core for miniature current transformers provided in this embodiment, compared with the prior art, features an annular protective shell that ensures the magnetic core ring 10 is enclosed within it, thus protecting the magnetic core ring 10. Furthermore, the multiple annular reinforcing rings 30 disposed on the outer circumference of the annular protective shell further enhance its structural strength, effectively resisting radial extrusion forces from the drive rollers and preventing deformation of the magnetic core ring 10 due to compression. The structure is simple, avoids affecting the accuracy of the miniature current transformer, and is highly practical.
[0029] In some embodiments, the aforementioned annular reinforcing ring 30 may be adopted as follows: Figure 1 and Figure 5 The structure shown. See also Figure 1 and Figure 5 Two annular reinforcing rings 30 are provided, and the two annular reinforcing rings 30 are respectively embedded at both ends of the annular protective shell along the axial direction of the magnetic core ring 10. This structure can reduce the number of annular reinforcing rings 30, and at the same time, this structure balances the extrusion force from the drive roller, avoids deformation of the annular protective shell under force, and enhances its structural strength.
[0030] In addition, this structure facilitates fixed installation. Annular notches can be opened at both ends of the annular protective shell, and then the annular reinforcing ring 30 can be fitted into the annular notches.
[0031] In this embodiment, the material of the annular protective shell can be epoxy resin, while the annular reinforcing ring 30 can be modified epoxy resin.
[0032] In some embodiments, the aforementioned annular reinforcing ring 30 may be adopted as follows: Figure 1 , Figure 2 and Figure 5 The structure shown. See also Figure 1 , Figure 2 and Figure 5 The outer diameter of each annular reinforcing ring 30 is larger than the outer diameter of the annular protective shell.
[0033] In this embodiment, the outer diameter of the annular reinforcing ring 30 is slightly larger than the outer diameter of the annular protective shell. This structure ensures that during the winding process, the two annular reinforcing rings 30 can directly contact each drive roller and directly resist pressure, thereby effectively preventing the radial pressure from being transmitted to the interior. This effectively protects the magnetic core ring 10 and is highly practical.
[0034] In some embodiments, the aforementioned annular reinforcing ring 30 may be adopted as follows: Figure 3 The structure shown. See also Figure 3 Each annular reinforcing ring 30 has a rounded corner structure 31 on its outer corner. This rounded corner structure 31 is relevant to the subsequent winding. The rounded corner structure 31 can prevent the coil from being subjected to concentrated stress during winding, thereby protecting the winding.
[0035] Correspondingly, rounded corners are also provided on the annular edges of the through hole at the center of the annular protective shell.
[0036] In some embodiments, the aforementioned annular protective shell may be adopted as follows: Figure 2 The structure shown. See also Figure 2The annular protective shell includes an upper shell 21 and a lower shell 22. The upper shell 21 has a first annular opening 211. The outer peripheral surface of the upper shell 21 is provided with a first connecting structure 23, and the inner sidewall of the upper shell 21 is provided with a second connecting structure 24. The lower shell 22 has a second annular opening 221 corresponding to the first annular opening 211. The second annular opening 221 can be combined with the first annular opening 211 to form an annular cavity for placing the magnetic core ring 10. The outer peripheral surface of the lower shell 22 is provided with a third connecting structure 25 adapted to the first connecting structure 23, and the inner sidewall of the lower shell 22 is provided with a fourth connecting structure 26 adapted to the second connecting structure 24.
[0037] After the upper housing 21 and the lower housing 22 are assembled, an annular cavity is formed for placing the magnetic core ring 10, thereby ensuring the placement of the magnetic core ring 10. Since there will be a gap after the magnetic core ring 10 is assembled with the annular cavity, in order to ensure the stability of the magnetic core ring 10, an injection hole can be provided on the upper housing 21 or the lower housing 22 to ensure that after the upper housing 21 and the lower housing 22 are assembled, the annular cavity is injected with glue to ensure the stability of the magnetic core ring 10.
[0038] The upper housing 21 and the lower housing 22 are fixedly connected by the first connecting structure 23 and the third connecting structure 25, and the second connecting structure 24 and the fourth connecting structure 26, which facilitates assembly.
[0039] In addition, the two annular reinforcing rings 30 can be located at the end of the upper housing 21 away from the lower housing 22 and the end of the lower housing 22 away from the upper housing 21, respectively.
[0040] In this embodiment, the inner hole of the upper housing 21 is connected to the inner hole of the lower housing 22 to form a through hole, so as to facilitate the subsequent winding operation. This technology is well known to those skilled in the art and will not be described in detail here.
[0041] In some embodiments, the first connection structure 23, the second connection structure 24, the third connection structure 25, and the fourth connection structure 26 described above can be adopted as follows: Figure 2 and Figure 3 The structure shown. See also Figure 2 and Figure 3 The first connecting structure 23 and the second connecting structure 24 have the same structure, both including multiple spring pieces 241 arranged at intervals around the axis of the upper housing 21. One end of each spring piece 241 extends out of the opening of the first annular opening 211 along the axial direction of the upper housing 21, and a hook 242 is provided at the extended end of each spring piece 241.
[0042] The third connecting structure 25 and the fourth connecting structure 26 are the same, both including multiple slots 261 that are spaced annularly around the axis of the lower housing 22.
[0043] Each spring piece 241 has a certain degree of elasticity and can undergo elastic deformation, thus facilitating engagement with the slot 261. Multiple first connecting structures 23 on the outer circumferential surface of the upper housing 21 are adapted to multiple third connecting structures 25 on the outer circumferential surface of the lower housing 22. Multiple second connecting structures 24 on the inner sidewall of the upper housing 21 are adapted to multiple fourth connecting structures 26 on the inner sidewall of the lower housing 22, ensuring multi-point connection and thus guaranteeing the strength and stability of the connection, resulting in high practicality.
[0044] In some embodiments, the upper housing 21 and the lower housing 22 may be adopted as follows: Figures 2 to 3 The structure shown. See also Figures 2 to 3 The upper housing 21 has multiple first grooves on its outer peripheral surface and inner bore sidewalls for mounting each spring clip 241. The lower housing 22 has multiple second grooves on its outer peripheral surface and inner bore sidewalls for each spring clip 241 to extend into. Each groove has a slot 261 on its bottom surface.
[0045] The first and second grooves ensure that the spring piece 241 is located in the side walls of the upper housing 21 and the lower housing 22, preventing the spring piece 241 from protruding. This avoids contact with the winding, thereby effectively preventing stress concentration in the coil and ensuring the quality and performance of the winding.
[0046] In some embodiments, the card slot 261 and the card hook 242 can be adopted as follows: Figure 4 The structure shown. See also Figure 4 Each card slot 261 is provided with a sloping structure 262 for the card hook 242 to contact.
[0047] After the hook 242 contacts the inclined surface, due to the elasticity of the spring piece 241 and the effect of the inclined surface structure 262, the lower housing 22 will have a continuous tendency to move towards the upper housing 21, so as to ensure the stability of the engagement between the upper housing 21 and the lower housing 22, which can effectively eliminate manufacturing errors and has strong practicality.
[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A nanocrystalline magnetic core for high-precision miniature current transformers, characterized in that, It includes a magnetic core ring and an annular protective shell enclosing the magnetic core ring therein; The outer circumferential surface of the annular protective shell is provided with at least two annular reinforcing rings, and each annular reinforcing ring is spaced apart along the axial direction of the magnetic core ring.
2. The high-precision miniature transformer nanocrystalline magnetic core as described in claim 1, characterized in that, Two annular reinforcing rings are provided, and the two annular reinforcing rings are respectively embedded at both ends of the annular protective shell along the axial direction of the magnetic core ring.
3. The high-precision miniature transformer nanocrystalline magnetic core as described in claim 2, characterized in that, The outer diameter of each of the annular reinforcing rings is larger than the outer diameter of the annular protective shell.
4. The high-precision miniature transformer nanocrystalline magnetic core as described in claim 3, characterized in that, Each of the annular reinforcing rings has a rounded corner structure at its outermost edge.
5. The high-precision miniature transformer nanocrystalline magnetic core as described in any one of claims 1-4, characterized in that, The annular protective shell includes: The upper shell has a first annular open cavity; the outer peripheral surface of the upper shell is provided with a first connecting structure, and the inner sidewall of the upper shell is provided with a second connecting structure; The lower housing has a second annular opening corresponding to the first annular opening, the second annular opening being used to combine with the first annular opening to form an annular cavity for placing the magnetic core ring; the outer peripheral surface of the lower housing is provided with a third connecting structure adapted to the first connecting structure, and the inner hole sidewall of the lower housing is provided with a fourth connecting structure adapted to the second connecting structure.
6. The high-precision miniature transformer nanocrystalline magnetic core as described in claim 5, characterized in that, The first connecting structure and the second connecting structure have the same structure, both including a plurality of spring pieces spaced apart around the axis of the upper housing. One end of each spring piece extends out of the opening of the first annular opening along the axial direction of the upper housing, and a hook is provided at the extended end of each spring piece. The third connection structure and the fourth connection structure are the same, both including multiple slots that are spaced apart in an annular arrangement around the axis of the lower housing.
7. The high-precision miniature transformer nanocrystalline magnetic core as described in claim 6, characterized in that, The outer peripheral surface and inner hole sidewall of the upper shell are provided with a plurality of first grooves for the placement of each of the spring pieces; The outer peripheral surface and inner hole sidewall of the lower housing are provided with a plurality of second grooves for each of the spring pieces to extend into; the bottom surface of each groove is provided with a slot.
8. The high-precision miniature transformer nanocrystalline magnetic core as described in claim 6, characterized in that, Each of the card slots is provided with a beveled structure for the card hook to contact.