CN109166725B - High-temperature superconducting magnet winding method - Google Patents
High-temperature superconducting magnet winding method Download PDFInfo
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- CN109166725B CN109166725B CN201810826504.7A CN201810826504A CN109166725B CN 109166725 B CN109166725 B CN 109166725B CN 201810826504 A CN201810826504 A CN 201810826504A CN 109166725 B CN109166725 B CN 109166725B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/06—Coil winding
- H01F41/061—Winding flat conductive wires or sheets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
- H01F6/065—Feed-through bushings, terminals and joints
Abstract
The invention discloses a method for winding a high-temperature superconducting magnet, wherein the magnet winding adopts a framework, the continuous winding of odd and even single-cake coils is realized through the forward and reverse rotation of the framework, and the adjacent single-cake coils are electrically connected through an inner joint or an outer joint; an inner wire head of a first single pancake coil is connected, the inner wire head is fixed to a framework from the outer side of the framework, and the framework rotates in the anticlockwise direction; the inner wire head of the second single-pancake coil enters the framework from the inner side of the framework and is used as a joint, so that the inner wire heads of the first single-pancake coil and the second single-pancake coil are connected, and the framework rotates clockwise; the third single-pancake coil is wound in the same way as the first single-pancake coil, and joints are made on the outer ends of the second single-pancake coil and the third single-pancake coil; and the fourth single-pancake coil is wound by the same method as the second single-pancake coil, and so on. The invention makes up the defect of limited strip length caused by processing technology, processing cost and the like, and has the characteristics of simple design of winding tools, small performance decline of superconducting wires, simple and convenient winding process and the like.
Description
The technical field is as follows:
the invention belongs to the field of superconducting magnet electrotechnics, and mainly relates to a high-temperature superconducting magnet winding method.
Background art:
the high-temperature superconducting magnet has the advantages of simple low-temperature system, low operation cost, higher stability, high current density and the like, and has wide application prospect in the fields of superconducting energy storage, magnetic separation, nuclear magnetic resonance imaging, strong magnetic fields, superconducting motors and the like.
The superconductors used in the high-temperature superconducting magnet are mostly commercially produced bismuth silver sheath tapes (Bi-2223/Ag) or YBCO coating high-temperature superconducting tapes. Bi-2223/Ag is mostly prepared by a powder sleeve method, YBCO is mostly prepared by a thin film deposition technology, and the YBCO has certain mechanical brittleness, is easy to damage and has larger performance decline under the bending with larger curvature. Due to the limitation of the technical process, the single wire length of the high-temperature superconducting tape is limited, and especially a long wire with high performance and good uniformity is difficult to prepare. Based on the length limitation and mechanical brittleness of the high-temperature superconducting strip, the high-temperature superconducting magnet generally adopts a double-cake structure, and then the high-temperature superconducting magnet is combined by connecting a plurality of double cakes in series and in parallel. The double-cake structure makes up the defect of limited length of the strip to a certain extent, but can not meet the application requirement of the high-temperature superconducting magnet with large size and multiple turns.
When wound in a conventional double-pancake coil, HTS tape undergoes two simultaneous bending deformations: firstly, the bending deformation is determined by the inner diameter (skeleton outer diameter) of the magnet along the belt surface direction; the second is lateral bending along the direction of the bandwidth. The first turn of the double-pancake coil is a single pancake to another single pancake transition, as compared to the other turns of the coil that are only bent in the face direction, and the HTS tape is not only bent in the face direction, but also has a wide band of movement on the bobbin axis, causing the tape to bend laterally. Lateral bending is more likely to cause degradation in the properties of the strip than bending in the direction of the plane of the strip. If the lateral bending can be reduced or even eliminated, the improvement of the performance of the double cake is significant.
The method for reducing the lateral bending mainly adopts a method that the strip material is bent around the outer diameter of the framework and moves a bandwidth axially to complete the transition from one single-pancake coil to another single-pancake coil. And the winding process of the double-cake coil is complicated, and the strip is easy to be damaged in the winding process.
The current superconducting tape low-resistance joint technology is fully developed, and the resistance of the superconducting tape joint can be easily realized to 10-8Of the order of omega, even 10-9Of the order of omega. On the other hand, the refrigeration technology is developed rapidly, and the refrigerating capacity and the refrigerating efficiency of the refrigerating machine are greatly improved. Based on the development of a low-resistance joint technology and a refrigeration technology, the winding method of the high-temperature superconducting magnet is innovatively provided for solving the problems that the length of a high-temperature superconducting strip is limited, a conventional double-pancake wound strip is bent laterally, the design and processing difficulty of a winding tool is high, the winding process of a double-pancake coil is complicated, and the like.
The invention content is as follows:
the invention aims to make up for the defects of the prior art, provides a high-temperature superconducting magnet winding method, and solves the problems that the length of a high-temperature superconducting strip is limited, the strip is bent laterally, the design and processing difficulty of a winding tool is high, the winding process of a double-pancake coil is complicated and the like when the conventional high-temperature superconducting double-pancake coil is wound.
The invention is realized by the following technical scheme:
a method for winding a high-temperature superconducting magnet is characterized by comprising the following steps: the magnet winding adopts a framework, the continuous winding of odd and even single-cake coils is realized through the forward and reverse rotation of the framework, and the adjacent single-cake coils are electrically connected through an inner joint or an outer joint;
the method specifically comprises the following steps:
1) cleaning the outer surface of the framework by using alcohol, winding a 0.2mm polyimide film for insulation, and then sequentially winding the single-cake coils on the framework by using a rotating tape reel and the framework;
2) firstly, making a joint for an inner wire head of a first single-pancake coil, fixing the inner wire head on a framework from the outer side of the framework, winding the first single-pancake coil to the designed number of layers, and rotating the framework in the anticlockwise direction;
3) the inner wire head of the second single-pancake coil enters the framework from the inner side of the framework and is used as a joint, so that the inner wire heads of the first single-pancake coil and the second single-pancake coil are connected, the framework rotates clockwise, and the second single-pancake coil is wound to the designed layer number;
4) winding the third single-pancake coil to the designed layer number; the framework rotates in the counterclockwise direction;
5) connecting the outer ends of the second single-pancake coil and the third single-pancake coil in series;
6) the winding is the same as that of the second single-pancake coil, the inner wire end of the fourth single-pancake coil enters the framework from the inner side of the framework and is used as a joint, the inner wire ends of the third single-pancake coil and the fourth single-pancake coil are connected, the framework rotates clockwise, and the fourth single-pancake coil is wound to the designed layer number;
7) and the like, winding the magnet to the designed number of single-cake coils.
When the magnet is wound, the torque motor controller is used for regulating and controlling the motor, about 25-30N of pulling force is applied to the strip, and the direction of rotation of the tape reel is clockwise all the time.
When the odd-number single-cake coil is wound, the inner thread end enters from the outer side of the framework, and the framework rotates anticlockwise; when the even number of single-cake coils are wound, the inner thread ends enter from the inner side of the framework, and the framework rotates clockwise.
The outer wire head of each single-cake coil can be temporarily fixed by using double-sided adhesive tape.
The (1, 2), (3, 4), (5, 6) … (2 n-1,2 n) single-pie coils are connected through an inner joint; the (2, 3), (4, 5), (6, 7) … (2 n,2n + 1) single-cake coils are connected through an external joint.
The two adjacent single-pancake coil indirect joints are connected in a bridging mode through a broadband, and the width of the broadband is twice of the width of a single strip used for winding the single-pancake coils and is about 8 mm.
And the joints between two adjacent single-pancake coils are bridged by using a plurality of same narrow bands, and the length of each joint is 8 cm.
The invention has the advantages that:
the method is simple, overcomes the defect that the length of the high-temperature superconducting strip is limited, and solves the problems that the strip is bent laterally in the conventional high-temperature superconducting double-pancake winding process, the design and processing difficulty of a winding tool is high, the double-pancake coil winding process is complicated and the like. The method has the characteristics of simple design of a winding tool, small performance decline of the superconducting wire, simple and convenient winding process and the like, and is suitable for winding the high-temperature superconducting magnet, especially large-size coils, and the existing single strip can not meet the requirement in length.
Description of the drawings:
fig. 1 is a schematic diagram of winding of a high-temperature superconducting magnet. In the figure: 1-framework 2-first single-pancake coil 3-reel 4-second single-pancake coil 5-third single-pancake coil 6-inter-pancake outer joint 7-inter-pancake inner joint 8-fourth single-pancake coil.
Fig. 2 is a schematic diagram of broadband bridging of a connector. In the figure: 9-a single pancake coil stub 10-a bridging strip 11-another single pancake coil stub.
FIG. 3 is a schematic representation of narrowband bridging of a linker. In the figure: 9-one single-pancake coil stub 12-bridging narrow band 11-another single-pancake coil stub.
The specific implementation mode is as follows:
see the drawings.
A method for winding a high-temperature superconducting magnet is characterized by comprising the following steps: the magnet winding adopts a framework 1, the continuous winding of odd and even single-cake coils is realized through the positive and negative rotation of the framework 1, and the adjacent single-cake coils are electrically connected through an inner joint 7 or an outer joint 6;
the method specifically comprises the following steps:
1) cleaning the outer surface of the framework 1 by alcohol and winding a polyimide film of 0.2mm for insulation; 2) an inner wire head of the first single-pancake coil 2 is connected, the inner wire head is fixed to the framework 1 from the outer side of the framework 1, the first single-pancake coil 2 is wound to the designed number of layers, and the framework 1 rotates in the anticlockwise direction; 3) the inner wire end of the second single-pancake coil 4 enters the framework 1 from the inner side of the framework 1 and is used as a joint, so that the inner wire ends of the first single-pancake coil 2 and the second single-pancake coil 4 are connected, the framework 1 rotates clockwise, and the second single-pancake coil 4 is wound to the designed layer number; 4) winding the third single-pancake coil 5 to the designed number of layers, wherein the inner wire head of the third single-pancake coil 5 is connected in the same way as the first single-pancake coil 2 in a winding way, the inner wire head is fixed to the framework 1 from the outer side of the framework 1, and the framework 1 rotates in the anticlockwise direction; 5) the outer wire heads of the second single-pancake coil 4 and the third single-pancake coil 5 are connected with a joint 6, so that the second single-pancake coil and the third single-pancake coil are connected in series; 6) the winding is the same as that of the second single-pancake coil 4, the inner wire head of the fourth single-pancake coil 8 enters the framework 1 from the inner side of the framework 1 and is used as a joint, so that the inner wire heads of the third single-pancake coil 5 and the fourth single-pancake coil 8 are connected, the framework 1 rotates clockwise, and the fourth single-pancake coil 8 is wound to the designed layer number; 7) and the like, winding the magnet to the designed number of single-cake coils. The outer wire head of each single-pancake coil can be temporarily fixed by using double-sided adhesive tape.
When odd single-cake coils are wound, an inner wire head enters from the outer side of the framework 1, and the framework 1 rotates anticlockwise; when winding an even number of single-cake coils, the inner wire head enters from the inner side of the framework 1, and the framework 1 rotates clockwise.
The (1, 2), (3, 4), (5, 6) … (2 n-1,2 n) single-pie coils are connected through an inner joint 7; the (2, 3), (4, 5), (6, 7) … (2 n,2n + 1) single-pancake coils are connected by an external joint 6.
As shown in fig. 2, two single-pancake coils can be bridged by a wide band 10, and the width of the wide band 10 is twice that of a single strip used for magnet winding, and is about 8 mm. As shown in fig. 3, the single pancake coil indirect joint can also be bridged using a plurality of identical narrow strips 12. The length of the joint is 8 cm. The high temperature superconducting tape for bridging is located on the lower side, and the stubs 9, 11 of the two single pancake coils are located on the upper side, on the same side (for ease of illustration, fig. 2 is a bottom view). Therefore, the stress caused by the thickness of the joint on the strip can be reduced, the YBCO high-temperature superconducting magnet can ensure that the superconducting surface at the joint is electrically connected with the superconducting surface, the superconducting surfaces of the two single-pancake coil strips face outwards, and the manufacture of the external joint 6 between the two single-pancake coils is facilitated. The joint resistance is 10-8Of the order of omega.
In order to achieve the highest possible tightness between the strip layers without damaging the superconducting core inside the strip by excessive tensile stress. And when the magnet is wound, the torque motor controller is used for regulating and controlling the motor, and about 25-30N of pulling force is applied to the strip. The direction of rotation of the reel 3 is always clockwise.
Claims (6)
1. A method for winding a high-temperature superconducting magnet is characterized by comprising the following steps: the magnet winding adopts a framework, the continuous winding of odd and even single-cake coils is realized through the forward and reverse rotation of the framework, and the adjacent single-cake coils are electrically connected through an inner joint or an outer joint; the method specifically comprises the following steps: 1) cleaning the outer surface of the framework by using alcohol, winding a 0.2mm polyimide film for insulation, and then sequentially winding the single-cake coils on the framework by using a rotating tape reel and the framework; 2) firstly, making a joint for an inner wire head of a first single-pancake coil, fixing the inner wire head on a framework from the outer side of the framework, winding the first single-pancake coil to the designed number of layers, and rotating the framework in the anticlockwise direction; 3) the inner wire head of the second single-pancake coil enters the framework from the inner side of the framework and is used as a joint, so that the inner wire heads of the first single-pancake coil and the second single-pancake coil are connected, the framework rotates clockwise, and the second single-pancake coil is wound to the designed layer number; 4) winding the third single-pancake coil to the designed layer number; the framework rotates in the counterclockwise direction; 5) connecting the outer ends of the second single-pancake coil and the third single-pancake coil in series; 6) the winding is the same as that of the second single-pancake coil, the inner wire end of the fourth single-pancake coil enters the framework from the inner side of the framework and is connected, so that the inner wire ends of the third single-pancake coil and the fourth single-pancake coil are connected, the framework rotates clockwise, and the fourth single-pancake coil is wound to the designed layer number; 7) and the like, winding the magnet to the designed number of single-cake coils.
2. A method of winding a high temperature superconducting magnet according to claim 1, wherein: when the magnet is wound, the torque motor controller is used for regulating and controlling the motor, 25-30N of pulling force is applied to the strip, and the direction of rotation of the belt reel is clockwise all the time.
3. A method of winding a high temperature superconducting magnet according to claim 1, wherein: when the odd-number single-cake coil is wound, the inner thread end enters from the outer side of the framework, and the framework rotates anticlockwise; when the even number of single-cake coils are wound, the inner thread ends enter from the inner side of the framework, and the framework rotates clockwise.
4. A method of winding a high temperature superconducting magnet according to claim 1, wherein: the outer wire head of each single-cake coil can be temporarily fixed by using double-sided adhesive tape.
5. A method of winding a high temperature superconducting magnet according to claim 1, wherein: the two adjacent single-pancake coil indirect joints are connected in a bridging mode through a broadband, and the width of the broadband is two times of that of a single strip used for winding the single-pancake coils and is 8 mm.
6. A method of winding a high temperature superconducting magnet according to claim 1, wherein: the two adjacent single-pancake coil indirect joints are bridged by using a plurality of same strips wound by the single-pancake coils, and the length of each joint is 8 cm.
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| CN112466592B (en) * | 2020-12-15 | 2022-04-05 | 兰州科近泰基新技术有限责任公司 | Water-cooling coil wound by copper strips and manufacturing process thereof |
| CN113257515B (en) * | 2021-07-12 | 2021-09-28 | 四川大学 | High-temperature superconducting double-pancake coil and winding and fixing method thereof |
| CN114388259B (en) * | 2022-01-13 | 2023-11-10 | 中国科学院电工研究所 | Non-joint multi-cake coil winding machine |
| CN114360894B (en) * | 2022-01-13 | 2023-10-27 | 中国科学院电工研究所 | Winding method of closed-loop superconducting magnet and closed-loop superconducting magnet |
| CN116631766A (en) * | 2023-05-31 | 2023-08-22 | 上海翌曦科技发展有限公司 | Device and method for coating insulating layer on single surface of high-temperature superconducting strip |
| CN117558549B (en) * | 2023-12-25 | 2024-04-02 | 中国科学院合肥物质科学研究院 | Double-pancake coil coiling method for MRI (magnetic resonance imaging) superconducting |
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| JPH0851764A (en) * | 1994-08-10 | 1996-02-20 | Chodendo Hatsuden Kanren Kiki Zairyo Gijutsu Kenkyu Kumiai | Rotor for superconducting electric rotating machine |
| US20040266628A1 (en) * | 2003-06-27 | 2004-12-30 | Superpower, Inc. | Novel superconducting articles, and methods for forming and using same |
| CN100487832C (en) * | 2005-10-24 | 2009-05-13 | 中国科学院电工研究所 | Double-winding double-plate coil coiling device and coiling method |
| JP2010129214A (en) * | 2008-11-25 | 2010-06-10 | Sumitomo Electric Ind Ltd | Superconductive wire material and manufacturing method |
| JP6155166B2 (en) * | 2013-10-25 | 2017-06-28 | 古河電気工業株式会社 | Superconducting magnetic bearing and cooling device |
| CN106298230B (en) * | 2016-08-16 | 2017-09-12 | 中国船舶重工集团公司第七一二研究所 | A kind of Multifunctional superconducting coil winding arrangement and winding method |
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