REBCO superconducting tape cross-layer insulation filling method
By using wrapping and limiting polyimide tape in REBCO superconducting magnets to fill the voids wound across layers and apply epoxy resin solution, the problem of REBCO superconducting magnets is solved, and the stability and safety of the magnets are improved.
Patent Information
- Application Number
- CN202411856281.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-03-21
AI Technical Summary
REBCO superconducting magnets are prone to single-layer vacancy during cross-layer winding, resulting in loss of superimposition and discharge in complex mechanical environments, thereby damaging the magnet.
The encapsulated polyimide tape is wrapped around the outside of the magnet frame and the limit polyimide tape along the upper and lower edges of the magnet frame, fill the voids that are wound across the layer, and apply epoxy solution to the surface of the coil to enhance insulation.
It effectively solves the problem of mechanical instability of the inner layer structure of the superconducting coil, avoids the loss of supernatant caused by stress concentration at low temperatures, reduces the induction discharge between the metal frame and the superconducting belt, and improves the stability and safety of the magnet.
Smart Images
Figure CN119673657A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of superconducting magnets, and in particular to a method for cross-layer insulation filling of a REBCO superconducting tape. Background Art
[0002] Since REBCO has a high current carrying capacity, REBCO superconducting magnets have the advantages of high stability, low loss, long life, and low operating costs. They are ideal equipment for providing magnetic field environments and have been widely used in nuclear fusion devices, accelerator devices, steady-state strong magnetic field devices, magnetic resonance technology (NMR and MRI), energy storage, and other fields. However, when REBCO superconducting tape is wound across layers, a single layer of vacancies will appear. During the operation of the magnet, the innermost turn of the superconducting tape will be subject to a complex mechanical environment such as electromagnetic force, winding tension, and thermal stress. In addition, the inner turn of the superconducting tape is most likely to discharge with the metal skeleton that generates eddy currents, resulting in quenching and damage to the magnet. Summary of the invention
[0003] The main purpose of the present invention is to provide a method for cross-layer insulation filling of REBCO superconducting tape to solve the above problems.
[0004] To achieve the above object, the present invention provides a method for filling REBCO superconducting tape cross-layer insulation, comprising the following steps:
[0005] S1, wrapping the polyimide tape around the outside of the magnet frame, so that the polyimide tape completely covers the outside of the magnet frame;
[0006] S2, wrapping the limiting polyimide tape along the upper and lower edges of the magnet frame to the outside of the wrapped polyimide tape;
[0007] S3, winding the REBCO superconducting tape across layers to form a coil, and the first coil of the REBCO superconducting tape is wound along the position not covered by the limiting polyimide tape;
[0008] S4. After winding, apply a layer of epoxy resin solution on the upper and lower surfaces of the coil and let it stand and solidify for 3 hours.
[0009] Furthermore, the material of the limiting polyimide tape is G10, YBCO or polytetrafluoroethylene.
[0010] Furthermore, the coil is a single or multiple continuous double-pancake coil structure wound in parallel.
[0011] Furthermore, in step S4, a layer of epoxy resin solution is applied to the upper and lower edges of the magnet skeleton.
[0012] Furthermore, the magnet skeleton is made of non-magnetic stainless steel 316L.
[0013] Furthermore, the length of the limiting polyimide tape is the same as the outer diameter circumference of the magnet skeleton, and the thickness is 0.5-1 times that of the REBCO superconducting tape.
[0014] The beneficial effects of the present invention are:
[0015] 1. The present invention fills the gaps in the cross-layer winding by limiting the polyimide tape, thereby solving the problem of mechanical instability of the inner layer structure of the superconducting coil and avoiding the magnet quenching caused by stress concentration at low temperature.
[0016] 2. The present invention solves the problem of inductive discharge between the eddy current of the metal skeleton and the superconducting tape by pasting and wrapping the polyimide tape on the magnet skeleton and applying epoxy resin film on the surface of the coil, and further stabilizes the inner layer structure.
[0017] 3. The present invention is effective and simple to operate, making the magnet structure more complete, compact and safer. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the coil filling structure of a method for cross-layer insulation filling of REBCO superconducting tapes according to the present invention.
[0019] Figure 2 This is a schematic diagram of a superconducting tape cross-layer insulation filling method for a REBCO superconducting tape according to the present invention.
[0020] Among them, 1-magnet skeleton; 2-wrapping polyimide tape; 3-limiting polyimide tape; 4-REBCO superconducting tape. DETAILED DESCRIPTION
[0021] In order to achieve the above-mentioned purpose and effect, the technical means and structures adopted by the present invention are described in detail with reference to the accompanying drawings for the features and functions of the preferred embodiments of the present invention.
[0022] like Figure 1-Figure 2 As shown, the present invention provides a method for cross-layer insulation filling of REBCO superconducting tape, comprising the following steps:
[0023] S1, wrapping the polyimide tape 2 around the outside of the magnet frame 1, so that the polyimide tape 2 completely covers the outside of the magnet frame 1;
[0024] Specifically, there should be no bubbles on the surface of the wrapped polyimide tape 2 after winding.
[0025] Specifically, the material of the limiting polyimide tape 3 may also be G10, YBCO or polytetrafluoroethylene.
[0026] S2, wrapping the limiting polyimide tape 3 along the upper and lower edges of the magnet frame 1 to the outside of the wrapped polyimide tape 2;
[0027] Specifically, the length of the limiting polyimide tape 3 is the same as the outer diameter circumference of the magnet frame 1, the thickness is 0.5-1 times that of the REBCO superconducting tape 4, and the width is the same as that of the REBCO superconducting tape 4. The limiting polyimide tape 3 is cut so that it is wound on the magnet frame 1 in a specific shape.
[0028] S3, winding the REBCO superconducting tape 4 across layers to form a coil, the first winding of the REBCO superconducting tape 4 is wound along the position not covered by the limiting polyimide tape 3;
[0029] Specifically, the cross-layer wound coil is a single or multiple parallel-wound continuous double-pancake coil structure.
[0030] S4. After winding, apply a layer of epoxy resin solution on the upper and lower surfaces of the coil and let it stand and solidify for 3 hours.
[0031] Specifically, a layer of epoxy resin solution is applied to the upper and lower edges of the magnet skeleton 1 . During the application, the epoxy resin solution should not touch the edge of the REBCO superconducting tape 4 .
[0032] In this embodiment, in step S2, the length of the limiting polyimide tape 3 is the same as the outer diameter circumference of the magnet skeleton 1, the thickness is 0.5-1 times that of the REBCO superconducting tape 4, and the width is the same as that of the REBCO superconducting tape 4. The limiting polyimide tape 3 is cut so that the limiting polyimide tape 3 is wound on the magnet skeleton 1 in a specific shape, so that the first circle of REBCO superconducting tape 4 and the limiting polyimide tape 3 wound in step S3 completely cover the outer surface of the magnet skeleton 1 wrapped with the wrapped polyimide tape 2.
[0033] The limiting polyimide tape 3 provides support for the winding of the coil, so that the REBCO superconducting tape 4 can be wound into the coil along the second winding direction.
[0034] Specifically, a section of limiting polyimide tape 3 with a width and thickness consistent with the REBCO superconducting tape 4 and a length equal to the outer diameter circumference of the magnet skeleton 1 can be taken, and it can be cut diagonally. The two cut sections of limiting polyimide tape 3 are respectively flattened along the upper and lower edges of the magnet skeleton 1, so that the winding trajectory of the first circle of the REBCO superconducting tape 4 is formed between the two sections of limiting polyimide tape 3, thereby limiting the winding direction of the REBCO superconducting tape 4 and the distance from the upper and lower edges of the magnet skeleton 1 by the limiting polyimide tape 3, and providing support for the subsequent REBCO superconducting tape 4.
[0035] The above descriptions are only preferred embodiments of the present invention, not all embodiments. Anyone should be aware that any structural changes made under the inspiration of the present invention, and any technical solutions that are the same or similar to the present invention, belong to the protection scope of the present invention.
Claims
1. A method for filling REBCO superconducting tape cross-layer insulation, characterized in that: The following steps are involved: S1, wrapping the polyimide tape (2) around the outer side of the magnet frame (1), so that the polyimide tape (2) completely covers the outer side of the magnet frame (1); S2, wrapping the limiting polyimide tape (3) along the upper and lower edges of the magnet frame (1) to the outside of the wrapped polyimide tape (2); S3, winding the REBCO superconducting tape (4) across layers to form a coil, wherein the first coil of the REBCO superconducting tape (4) is wound along a position not covered by the limiting polyimide tape (3); S4. After winding, apply a layer of epoxy resin solution on the upper and lower surfaces of the coil and let it stand and solidify for 3 hours.
2. A method for filling REBCO superconducting tape cross-layer insulation as claimed in claim 1, characterized in that: The material of the limiting polyimide tape (3) is G10, YBCO or polytetrafluoroethylene.
3. A method for filling cross-layer insulation of REBCO superconducting tape according to claim 1, characterized in that: The coil is a single coil or a plurality of coils wound in parallel and having a continuous double-pancake coil structure.
4. A method for filling cross-layer insulation of REBCO superconducting tape as claimed in claim 1, characterized in that: In step S4, a layer of epoxy resin solution is also applied to the upper and lower edges of the magnet skeleton (1).
5. A method for filling cross-layer insulation of REBCO superconducting tape as claimed in claim 1, characterized in that: The magnet skeleton (1) is made of non-magnetic stainless steel 316L.
6. A method for filling REBCO superconducting tape cross-layer insulation as claimed in claim 1, characterized in that: The length of the limiting polyimide tape (3) is the same as the outer diameter circumference of the magnet skeleton (1), and the thickness is 0.5-1 times that of the REBCO superconducting tape (4).