CN111986868B - Wound magnet based on high-temperature superconducting cable and winding method - Google Patents
Wound magnet based on high-temperature superconducting cable and winding method Download PDFInfo
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- CN111986868B CN111986868B CN202010828268.XA CN202010828268A CN111986868B CN 111986868 B CN111986868 B CN 111986868B CN 202010828268 A CN202010828268 A CN 202010828268A CN 111986868 B CN111986868 B CN 111986868B
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- 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
- 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
- H01F41/048—Superconductive coils
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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
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Abstract
The invention provides a wound magnet based on a high-temperature superconducting cable, which comprises a framework with a cylindrical structure, a first end plate and a second end plate, wherein the first end plate and the second end plate are arranged at two ends of the framework, a cable is wound on the surface of the framework between the first end plate and the second end plate, the cable comprises a cylindrical high-conductivity core material, a laminated superconducting structure is formed by winding a single or a plurality of ReBCO superconducting strips on the core material, and two terminals which are respectively communicated with two ends of the cable are arranged at the axial end part of the framework. The invention further discloses a winding method of the magnet. The invention has the advantages that: the cable uses high-conductivity materials as core materials, reduces current loss and electric heating loss, and is suitable for high-intensity current; the layered superconducting structure formed by ReBCO spiral winding overcomes the limitation of a single-layer winding structure on current intensity in the prior art, and can be used for high-intensity current so as to generate a high-intensity magnetic field.
Description
Technical Field
The invention relates to the technical field of high-field inserted magnets, in particular to a wound magnet and a winding method based on a high-temperature superconducting cable.
Background
The strong magnetic field is the same as the extremely low temperature and the ultrahigh pressure, is one of the most important extreme conditions of modern scientific experiments, provides a new way for the research of physics, chemistry, materials, biology and other disciplines, and has important functions on discovering and understanding new phenomena and disclosing new rules. With the continuous and deep research of each subject, the requirement of each research system on the magnetic field intensity is higher and higher, and the requirement on the space size is also higher and higher.
The superconducting magnet widely applied at present mainly comprises NbTi and Nb3Sn low-temperature superconducting material, but the application of the Sn low-temperature superconducting material is limited by an upper critical field, especially for the application environment with the requirement of magnetic field intensity higher than 20T. Based on the situation, at present, researchers at home and abroad mainly consider mining high-field magnetsThe method is characterized in that a high-temperature and low-temperature mixed superconducting magnet is used, namely, one or more high-temperature superconducting magnets are inserted into a coaxial structure of the low-temperature superconducting magnet to obtain a higher magnetic field so as to meet application requirements. The inserted magnet is mainly made of practical superconducting materials such as Bi2212 and ReBCO which still have high current-carrying performance under high field. Compared with the prior art, the ReBCO superconducting material has a high-strength nickel-based metal substrate and high mechanical strength, so that the ReBCO superconducting material has more excellent operation stability in a high field; however, ReBCO superconducting materials are generally in a strip structure, and research on magnets inserted into ReBCO superconducting materials is mainly focused on a pancake or solenoid magnet directly wound by a single strip, such as a supporting framework for adjusting turn-to-turn resistance of an uninsulated superconducting magnet and a using method thereof disclosed in the invention patent with the publication number of 109950018A; namely, a skeleton for a pancake magnet is disclosed; the strength of the magnet is not high due to the limited magnitude of the running current of a single strip. In addition, the ReBCO superconducting tape is of a layered structure, and the phenomenon of layering of the superconducting tape caused by electromagnetic stress pulling is easy to occur under a high field, so that the magnet is damaged and cannot run. In order to avoid the phenomenon, the central aperture design of the ReBCO cake type magnet under a high magnetic field is generally smaller, which brings certain limitation to the application of the ReBCO cake type magnet in a high-field and large-aperture research system.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a magnet manufactured by using a high-temperature superconducting cable so as to meet the use requirements of high fields and large apertures.
The invention solves one of the technical problems through the following technical scheme: the utility model provides a coiling magnet based on high temperature superconducting cable, includes the skeleton of cylindric structure, sets up in the first end plate and the second end plate at skeleton both ends, and the winding of skeleton surface between first end plate and the second end plate has the cable, the cable includes cylindric high electrically conductive core, form laminar superconducting structure through single or many ReBCO superconducting tape winding on the core, the axial tip of skeleton is provided with respectively with two terminals of cable both ends intercommunication.
In the embodiment, the cable made of the multilayer superconducting tapes is wound on the cylindrical framework, so that the multilayer cable can be wound, and the cable is spirally wound by using ReBCO to form a layered superconducting structure, so that the limitation of a single-layer winding structure on the current intensity in the prior art is overcome, and the cable can be used for high-intensity current, so that a high-intensity magnetic field can be generated; further improving the electric field intensity and the magnetic field intensity on the framework; compared with a cake-shaped magnet, the composite superconducting magnet can improve the aperture, can independently run to generate a strong magnetic field, and can also be inserted into inner holes of other superconducting magnets, so that a high-magnetic-field composite superconducting magnet system with the aperture of more than 30T can be generated in a large aperture of 50-200 mm; can meet the requirements of high-field and large-aperture research.
Preferably, the winding directions of the superconducting tapes of different layers are the same or opposite.
Preferably, the superconducting structure further comprises a protective layer arranged on the outer layer of the superconducting structure and an insulating layer arranged on the periphery of the protective layer.
Preferably, the protective layer is manufactured by wrapping the outer layer of the superconducting structure in a half-overlapping mode through a metal strip with certain strength and plasticity, and the insulating layer is wrapped outside the protective layer in a half-overlapping mode through a strip with insulating performance or sleeved outside the protective layer through a heat-shrinkable tube.
Preferably, two the terminal is fixed in on the first end plate, and the terminal passes through insulating support and skeleton insulation fit, insulating support and skeleton spiro union cooperation.
Preferably, the first end plate is provided with a guide groove for accommodating the cable, and each terminal is correspondingly provided with one guide groove; the guiding groove includes the segmental arc and the straight section, the segmental arc sets up in the one end that the terminal was kept away from to first end plate, and the segmental arc is set up around the periphery of skeleton and is guided the cable to the axial by the tangential winding, the segmental arc feeds through naturally with straight section towards the one end of terminal, the straight section extends to the tip of first end plate with first end plate axial direction parallel, and the terminal sets up along the axial of skeleton, and the one end of terminal towards first end plate is provided with the storage tank, the cable passes through soldering tin packing encapsulation in the storage tank.
Preferably, first end plate and skeleton fixed coordination, axial adjustment fixed position can be followed with the skeleton to the second end plate, is provided with along radial with the fixed complex locking bolt of skeleton on the second end plate.
Preferably, flanges are respectively fixed at two ends of the framework, through holes coaxial with the straight sections are formed in the positions where the flanges are matched with the straight sections, and the cables penetrate through the through holes and the insulating supports along the guide grooves and extend into the accommodating grooves.
Preferably, the insulation support comprises a guide part and an encapsulation part which can be spliced with each other, a cable groove communicated with two axial ends of the guide part is formed in the side surface of the guide part, and the encapsulation part can be matched with the side surface of the guide part to cover the cable groove; the terminal comprises an accommodating block fixedly matched with the insulating support and a filling plate matched with the accommodating block, the accommodating groove is a blind groove axially arranged along the accommodating block, and the open end of the accommodating groove is communicated with the cable groove; the filling plate can cover the containing groove from the side face of the containing block, and the surface of the filling plate is provided with a filling groove along the length direction of the containing groove.
Preferably, one end of the accommodating block facing the insulating support is provided with a U-shaped opening for clamping the insulating support, rib plates perpendicular to the mutual matching surfaces of the guiding part and the packaging part are arranged on the outer sides of the guiding part and the packaging part, two sides of the U-shaped opening are respectively matched with the two rib plates through screw connection of fixing bolts, and the fixing direction of the fixing bolts is perpendicular to the normal directions of the rib plates and the matching surfaces of the guiding part and the packaging part; the bottom end of the U-shaped opening and the end of the filling plate 43 are abutted against the end of the insulating support 6.
Preferably, the framework is made of annular hollow metal materials, and the inner diameter of the framework meets the requirement
Wherein r is the inner diameter of the magnet, d is the outer diameter of the core material, w is the width of the cable, and a and alpha are the winding axial distance and the winding angle of the ReBCO superconducting tape in the cable.
Preferably, the cable is at least provided with a pretensioning component which provides pretensioning force along the radial direction at the outermost layer.
Preferably, the pre-tightening component is arranged between every two layers of wound cables and is formed by winding stainless steel strips.
The winding method of the wound magnet based on the high-temperature superconducting cable comprises the following steps:
s1: manufacturing a superconducting cable;
s2: a first end plate, a second end plate and flanges at two sides are arranged on the cylindrical framework;
s3: arranging the cable along the guide groove on the first end plate, extending the end part of the cable to the position above the flange, fixing the end part of the cable, and tightly and spirally winding the cable on the framework between the first end plate and the second end plate;
s4: the other end of the cable is passed through the flange on one side of the first end plate along another guide groove and the connection positions of the two ends of the cable and the two terminals are filled with molten solder material.
Preferably, the cable is wound on a cable drum with adjustable rotation resistance in S3, the framework is fixed on a support frame through a flange, the cable drum and the framework are coaxially arranged and can rotate, after the cable is fixedly connected with a terminal, the framework is rotated to complete the first circle of cable winding, the winding angle of the cable is adjusted based on the number of winding turns, and then the framework is rotated to continue winding, so that the cable is axially and tightly arranged on the framework.
Preferably, after the winding of one layer of cable is completed, the cable is wound and climbs along a gap between the end face of the first end plate or the second end plate and the last layer of cable until the wound cable is higher than the last layer of cable, then the winding angle of the first ring of cable in the layer is adjusted based on the number of winding turns, and the first ring is used as a reference to wind the cable behind.
Preferably, after the first layer of cables is wound, the second end plate is moved along the axial direction to extrude the cables, and the second end plate and the framework are relatively fixed through the locking bolt.
Preferably, after the layer of cable is wound, the stainless steel strip is wound on the layer of cable with a preset radial pretightening force to obtain the pretightening component of the layer.
Preferably, in S4, the connection position between the terminal and the lead is heated to 150 to 200 ℃, and then the connection position is filled with the solder material.
The wound magnet and the winding method based on the high-temperature superconducting cable have the advantages that: the layered superconducting structure is formed by using ReBCO spiral winding, the limitation of a single-layer winding structure on the current intensity in the prior art is overcome, and the layered superconducting structure can be used for high-intensity current so as to generate a high-intensity magnetic field; by arranging the protective layer and the insulating layer, the problem that the existing multilayer ReBCO strip is easy to separate due to electromagnetic stress pulling under a high field can be solved, and the service life of the cable under the high field is prolonged; the cable made of the multilayer superconducting strips is wound on the cylindrical framework, so that the multilayer cable can be wound, and the electric field intensity and the magnetic field intensity on the magnet are improved; compared with a cake-shaped magnet, the composite superconducting magnet has the advantages that the aperture can be increased, so that the composite superconducting magnet can independently run to generate a strong magnetic field and can also be inserted into inner holes of other superconducting magnets, and a high-magnetic-field composite superconducting magnet system with the aperture of more than 30T can be generated in a large aperture of 50-200 mm; can meet the requirements of high-field and large-aperture research.
Drawings
Fig. 1 is a schematic view of a wound magnet based on a high temperature superconducting cable according to an embodiment of the present invention;
fig. 2 is a sectional view of a columnar multi-layer high temperature superconducting cable provided by an embodiment of the present invention;
FIG. 3 is a schematic view of a wound magnet unwound cable based on a high temperature superconducting cable according to an embodiment of the present invention;
fig. 4 is a schematic view of a terminal and an insulating support of a wound magnet based high temperature superconducting cable provided by an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a wound magnet with a pretensioning element only on the outermost layer according to an embodiment of the invention;
FIG. 6 is a cross-sectional view of a wound magnet with a pretensioning element positioned outside each layer of cable according to an embodiment of the present invention;
fig. 7 is a schematic view of a method for winding a superconducting tape-based magnet according to an embodiment of the present invention.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
Referring to fig. 1, the present embodiment provides a wound magnet based on a high temperature superconducting cable, which includes a bobbin 1 having a cylindrical structure, a first end plate 21 and a second end plate 22 disposed at two ends of the bobbin 1, and the cable 3 wound on the surface of the bobbin 1 between the first end plate 21 and the second end plate 22; with reference to fig. 2, the cable 3 includes a cylindrical highly conductive core 31, on which a layered superconducting structure 32 is formed by winding a single or multiple ReBCO superconducting tapes on the core 31; the axial end of the framework 1 is provided with two terminals 4 respectively communicated with two ends of the cable 3.
In the embodiment, the cable 3 made of the multilayer superconducting tapes is wound on the cylindrical framework 1, so that the multilayer cable 3 can be wound, and the cable 3 is spirally wound by using ReBCO to form the layered superconducting structure 32, so that the limitation of a single-layer winding structure on the current intensity in the prior art is overcome, and the cable can be used for high-intensity current, so that a high-intensity magnetic field can be generated; further improving the electric field intensity and the magnetic field intensity on the framework 1; compared with a cake-shaped or spiral tube magnet, the diameter of the magnet can be increased, so that the magnet can be independently operated to generate a strong magnetic field, and can also be inserted into inner holes of other superconducting magnets to realize a high-magnetic-field composite superconducting magnet system which can generate more than 30T in a large diameter of 50-200 mm; can meet the requirements of high-field and large-aperture research.
In the cable 3, the winding directions of the superconducting tapes of different layers are the same or opposite, the cable 3 further comprises a protective layer 33 wound on the outer layer of the superconducting structure 32 through half-lap wrapping and an insulating layer 34 arranged on the periphery of the protective layer 33, the protective layer 33 is made of a metal material with certain strength and plasticity, and a copper strip or a stainless steel strip is selected in the embodiment; the insulating layer 34 is formed by half-laminating an insulating material, such as polyimide tape, on the outer side of the metal protection layer 33; a heat shrinkable tube having an insulating property may be used to cover the outside of the metal protection layer 33. By providing the protective layer 33 and the insulating layer 34, the service life of the cable under high fields can be improved.
The first end plate 21 and the second end plate 22 are made of non-magnetic stainless steel materials or insulating materials with certain strength; to prevent the generation of induced magnetic field and induced electric field in the first end plate 21 and the second end plate 22; two terminals 4 all with first end plate 21 fixed coordination, the axial of terminal 4 and the axial direction parallel of skeleton 1, the one end that terminal 4 was kept away from to first end plate 21 is provided with guiding groove 23, refer to fig. 3, and every terminal 4 correspondence is provided with a guiding groove 23, guiding groove 23 includes segmental arc 231 and straight section 232, segmental arc 231 sets up in the one end that terminal 4 was kept away from to first end plate 21, and segmental arc 231 has the tangential winding to guide to the axial around the periphery setting of skeleton 1 with cable 3, segmental arc 231 is towards the one end of terminal 4 and straight section 232 transition connection naturally, and straight section 232 and first end plate 21 axial direction parallel extend to the tip of first end plate 21.
The first end plate 21 is fixedly connected with the framework 1, for example, by bolts, welding, and the like, the second end plate 22 needs to be axially adjusted in position when the cable 3 is wound, and with reference to fig. 1 and 5, in this embodiment, the second end plate 22 is fixed on the framework 1 by radial locking bolts 24, wherein the threaded holes on the second end plate 22 are waist-shaped holes arranged along the axial direction, so that the fixing position can be axially adjusted.
The terminal 4 is arranged along the axial direction of the framework 1, the terminal 4 is provided with a containing groove 41 matched with the cable 3, a core material 31 and a layered superconducting structure 32 at the end part of the cable 3 extend into the containing groove 41 to be electrically connected with the terminal 4, in order to ensure the uniform distribution of loading current among all layers of superconducting strips of the whole cable 3, the containing groove 41 is filled and packaged by using a molten high-conductivity soldering tin material, and the terminal 4 is made of a high-conductivity oxygen-free copper block material.
Referring to fig. 1 again, flanges 5 are further fixed to two ends of the frame 1 respectively, two insulating supports 6 are fixed to the frame 1 in a screwed manner, terminals are fixed to the insulating supports 6 and connected with the cables 3, the flange 5 on one side of the first end plate 21 is provided with a through hole 51 through which the cables 3 pass, and the cables 3 pass through the through hole 51 and the insulating supports 6 along the guide groove 23 and extend into the accommodating groove 41.
With reference to fig. 4, the insulating support 6 includes a guide portion 61 and an encapsulating portion 62 that can be assembled with each other, a side surface of the guide portion 61 has a cable groove 63 that communicates with both ends of the guide portion 61 in the axial direction, and the encapsulating portion 62 can cooperate with a side surface of the guide portion 61 to cover the cable groove 63; the terminal 4 comprises an accommodating block 42 fixedly matched with the insulating support 6 and a filling plate 43 matched with the accommodating block 42, the accommodating groove 41 is a blind groove arranged along the axial direction of the accommodating block 42, and the open end of the accommodating groove 41 is communicated with the cable groove 63; the filling plate 43 can cover the receiving groove 41 from the side surface of the receiving block 42, and the filling plate 43 has a filling groove 44 formed on the surface thereof along the longitudinal direction of the receiving groove 41, so that the receiving groove 41 is filled with the solder material through the filling groove 44 when the connecting position between the cable 3 and the terminal 4 is sealed.
One end of the accommodating block 42 facing the insulating support 6 is provided with a U-shaped opening 45 for clamping the insulating support 6, two sides of the U-shaped opening 45 are respectively fixed with the guide part 61 and the packaging part 62 in a threaded manner, and the bottom end of the U-shaped opening is abutted against the end part of the insulating support 6; specifically, the guiding portion 61 and the encapsulating portion 62 are both provided with rib plates 64 perpendicular to the matching surfaces thereof, two sides of the U-shaped opening 45 are respectively matched with the two rib plates 64 through fixing bolts (not shown), and the fixing direction of the fixing bolts is perpendicular to the rib plates 64 and the normal direction of the matching surfaces of the guiding portion 61 and the encapsulating portion 62; therefore, the two sides of the U-shaped opening 45 limit the matching direction of the guide part 61 and the packaging part 62, and the guide part 61 and the packaging part 62 are prevented from loosening; the end of the filler plate 43 abuts against the end of the insulating support 6.
The framework 1 is wound with a plurality of layers of cables 3, referring to fig. 5, at least the outermost layer of the cables 3 is wrapped with a pre-tightening component 7, and at the moment, the outermost layer of the pre-tightening component 7 is fixedly wrapped by the parts of the first end plate 21 and the second end plate 22 which are communicated with each other, so that the performance stability of the wound magnet under the action of high electromagnetic and thermal stress is ensured; referring to fig. 6, a pretensioning member 7 is installed on the periphery of each layer of cable in the present embodiment, and the pretensioning member 7 can be wound by using a stainless steel band under a set tension control and fixed by spot welding, or can be fixed by using a stainless steel plate bolt under pressure or welded under pressure.
The inner diameter of the framework 1 needs to satisfy:
wherein r is the inner diameter of the innermost layer of the magnet wound cable, namely the outer diameter of the framework 1, d is the outer diameter of the core material 31, w is the width of the ReBCO superconducting tape, a and alpha are the minimum spacing and the winding angle of the ReBCO superconducting tape in the cable, and the winding angle is the included angle between the winding direction of the superconducting tape and the radial direction of the framework 1; in the embodiment, the outer diameter of the framework is preferably 50-500 mm, and the winding angle is preferably 30-70 degrees.
The embodiment also provides a winding method of the magnet based on the high-temperature superconducting tape, which comprises the following steps:
s1: manufacturing the superconducting cable 3;
referring to fig. 2, multiple layers of ReBCO superconducting tapes are wound around the periphery of the core 31 to obtain a layered superconducting structure 32, each layer of wound ReBCO superconducting tapes can be single or multiple, the winding directions of the ReBCO superconducting tapes on different layers can be the same or opposite, the axial distance between the same ReBCO superconducting tape on the same layer is kept as a, and the winding angle of the ReBCO superconducting tape is alpha; then, using a belt-shaped metal material to wrap the outer surface of the superconducting structure 32 in a half-lap wrapping manner to obtain a protective layer 33; the insulating layer 34 is wrapped outside the protective layer 33 in a half-lap manner by using a tape having insulating property, or is wrapped outside the protective layer 33 by using an insulating heat-shrinkable tube. The strip-shaped metal material should have certain strength and toughness, and may be a copper strip or a stainless steel strip, and the insulating layer 34 may be wrapped with a polyimide tape.
S2: fixing a first end plate 21 and a second end plate 22 at two ends of the cylindrical framework 1, and fixing flanges 5 at two sides;
referring to fig. 1, a first end plate 21 and a second end plate 22 are sleeved on a framework 1, the first end plate 21 is fixed on the framework 1 by screwing or welding, or can be directly manufactured integrally with the framework 1, and the second end plate 22 is fixed on the framework 1 by a radial locking bolt 24; and then fixing flanges 5 at two ends of the framework 1 respectively in a bolt or welding mode.
S3: laying the cable 3 along a guide groove 23 on the first end plate 21 on the inner surface of the first end plate 21, extending the end part of the cable 3 to the upper part of the flange 5, reserving a sufficient length of the cable 3 according to the length of the terminal 4 and the insulating support 6, and fixing; tightly winding the cable 3 on the framework 1 between the first end plate 21 and the second end plate 22 according to the designed number of turns;
the method of winding the cable 3 is: referring to fig. 7, the cable 3 is wound on the cable drum 8 with adjustable rotation resistance, the framework 1 is fixed on a support frame 9 through the flange 5, and the flange 5 is fixed at two axial ends of the framework 1 through a screw connection or welding mode.
The cable drum 8 and the framework 1 are coaxially arranged and can rotate, and after the cable 3 is connected with the terminal 4, the cable 3 is wound on the framework 1 along the end face of the first end plate 21 facing the second end plate 22; the winding angle of the cable 3 is determined based on the number of winding turns, after the first winding is completed, the winding angle of the cable 3 is adjusted, then the framework 1 is rotated to continue winding, the rotation resistance of the cable winding drum 8 can be adjusted when the cable 3 is wound, the cable 3 is always kept tensioned, the cable 3 is ensured to be tightly wound on the framework 1, the axial strain value of the cable 3 is required to be kept lower than 0.5% when the cable 3 is wound, therefore, the cable 3 can be ensured to be arranged on the framework 1 in a tight axial mode, and the cable 3 can be prevented from being damaged.
After the winding of one layer of the cable 3 is finished, the cable 3 is wound and climbs along a gap between the end face of the end plate closest to the end plate and the last layer of the cable 3 until the distance is higher than that of the last layer of the wound cable, then the winding angle of the first ring of the cable 3 of the layer is adjusted based on the number of winding turns, the first ring is used as a reference to wind the cable 3 behind, and the process is repeated until all the cables 3 are wound.
After the first winding of the cable 3 is completed, the second end plate 22 is moved in the axial direction so as to press the cable 3, and the locking bolt 24 is used to fix the second end plate 22 and the framework 1 relatively under the condition of ensuring that the cable 3 is in the state of being pressed in the axial direction.
S4: the other end of the cable 3 is passed through the flange 5 on the first end plate 21 side along another guide groove 23, then the insulating support 6 and the terminal 4 are fixed in order on the flange 5, and the connecting position of the cable 3 and the terminal 4 is filled with molten solder material;
after the cable 3 is wound, the cable 3 is connected with the terminal 4 along the arc-shaped groove 23 of the first end plate 21, the cable 3 is inserted into the accommodating groove 41 at the end part of the terminal 4, then the terminal 4 is heated to 150-200 ℃, the connecting position is filled with a soldering tin material in the accommodating groove 41 through the filling groove 44 until the soldering tin overflows, and then the cooling is performed.
The method further comprises the step of installing a pre-tightening component 7 on the outer layer of the wound cable 3, wherein the pre-tightening component 7 is made of a stainless steel strip, and the pre-tightening component 7 can be arranged on the outermost layer of the wound cable 3 or on the outer layer of each layer of cable; the installation method is that the stainless steel strip is wound on the outer layer of the cable 3 according to the preset radial pretightening force, the pretightening component 7 is arranged on the outer layer of each layer of the cable 3, a gap for the cable 3 to penetrate through can be reserved on the edge, and when the pretightening component 7 on the outermost layer is fixed, the pretightening component 7 needs to be pressed on the parts of the first end plate 21 and the second end plate 22 to realize integral pretightening.
When the magnet is specifically wound, a person skilled in the art can determine the number of layers to be wound and the number of turns of each layer of the cable according to the description of the embodiment by combining the cable and the magnetic field parameters.
Claims (14)
1. A wound magnet based on a high-temperature superconducting cable is characterized in that: the cable comprises a cylindrical framework, a first end plate and a second end plate, wherein the first end plate and the second end plate are arranged at two ends of the framework, a cable is wound on the surface of the framework between the first end plate and the second end plate, the cable comprises a cylindrical high-conductivity core material, a single or a plurality of ReBCO superconducting strips are wound on the core material to form a layered superconducting structure, and two terminals which are respectively communicated with two ends of the cable are arranged at the axial end part of the framework;
the two terminals are fixed on the first end plate, the terminals are in insulation fit with the framework through insulation supports, and the insulation supports are in threaded fit with the framework;
the first end plate is provided with a guide groove for accommodating a cable, and each terminal is correspondingly provided with one guide groove; the guiding groove includes the segmental arc and the straight section, the segmental arc sets up in the one end that the terminal was kept away from to first end plate, and the segmental arc is set up around the periphery of skeleton and is guided the cable to the axial by the tangential winding, the segmental arc feeds through naturally with straight section towards the one end of terminal, the straight section extends to the tip of first end plate with first end plate axial direction parallel, and the terminal sets up along the axial of skeleton, and the one end of terminal towards first end plate is provided with the storage tank, the cable passes through soldering tin packing encapsulation in the storage tank.
2. The wound magnet based on a hts cable of claim 1, characterized in that: the winding directions of the superconducting tapes of different layers are the same or opposite.
3. The wound magnet based on a hts cable of claim 1, characterized in that: the superconducting structure further comprises a protective layer arranged on the outer layer of the superconducting structure and an insulating layer arranged on the periphery of the protective layer.
4. A wound magnet based on a hts cable according to claim 3, characterized by: the protective layer is manufactured by wrapping the outer layer of the superconducting structure in a half-overlapping mode through a metal strip, and the insulating layer is wrapped outside the protective layer in a half-overlapping mode through a strip with insulating performance or sleeved outside the protective layer through a heat-shrinkable tube.
5. The wound magnet based on a hts cable of claim 1, characterized in that: the first end plate is fixedly matched with the framework, the second end plate and the framework can adjust the fixed position along the axial direction, and the second end plate is provided with a locking bolt which is fixedly matched with the framework along the radial direction.
6. The wound magnet based on a hts cable of claim 1, characterized in that: flanges are respectively fixed at two ends of the framework, through holes coaxial with the straight sections are formed in the positions where the flanges are matched with the straight sections, and the cables penetrate through the through holes and the insulating supports along the guide grooves and extend into the accommodating grooves.
7. The wound magnet based on a hts cable of claim 6, characterized in that: the insulation support comprises a guide part and an encapsulation part which can be spliced with each other, a cable groove communicated with two axial ends of the guide part is formed in the side surface of the guide part, and the encapsulation part can be matched with the side surface of the guide part to cover the cable groove; the terminal comprises an accommodating block fixedly matched with the insulating support and a filling plate matched with the accommodating block, the accommodating groove is a blind groove axially arranged along the accommodating block, and the open end of the accommodating groove is communicated with the cable groove; the filling plate can cover the containing groove from the side face of the containing block, and the surface of the filling plate is provided with a filling groove along the length direction of the containing groove.
8. The wound magnet based on a hts cable of claim 7, characterized in that: one end of the accommodating block facing the insulating support is provided with a U-shaped opening for clamping the insulating support, rib plates perpendicular to the mutual matching surfaces of the guiding part and the packaging part are arranged on the outer sides of the guiding part and the packaging part, two sides of the U-shaped opening are respectively matched with the two rib plates through fixing bolts in a threaded mode, and the fixing direction of the fixing bolts is perpendicular to the normal directions of the rib plates and the matching surfaces of the guiding part and the packaging part; the bottom end of the U-shaped opening and the end of the filling plate 43 are abutted against the end of the insulating support 6.
9. The wound magnet based on a hts cable of claim 1, characterized in that: the framework is made of annular hollow metal material, and the inner diameter of the framework meets the requirement
Wherein r is the inner diameter of the magnet, d is the outer diameter of the core material, w is the width of the cable, and a and alpha are the winding axial distance and the winding angle of the ReBCO superconducting tape in the cable; wherein the winding angle is an acute angle between the tangential direction and the axial direction of the cable.
10. The wound magnet based on a hts cable of claim 1, characterized in that: at least the outermost layer of the cable is sleeved with a pre-tightening component which provides pre-tightening force along the radial direction.
11. A wound magnet based on a hts cable according to claim 10, characterized by: the pre-tightening component is arranged between every two layers of wound cables and is formed by winding stainless steel strips.
12. The method of winding a wound magnet based on a hts cable of any of claims 1-11, characterized in that: the method comprises the following steps:
s1: manufacturing a superconducting cable;
s2: a first end plate, a second end plate and flanges at two sides are arranged on the cylindrical framework;
s3: arranging the cable along the guide groove on the first end plate, extending the end part of the cable to the position above the flange, fixing the end part of the cable, and tightly and spirally winding the cable on the framework between the first end plate and the second end plate;
s4: the other end of the cable penetrates through the flange on one side of the first end plate along the other guide groove, and molten soldering tin materials are used for filling the connecting positions of the two ends of the cable and the two terminals;
in the step S3, a cable is wound on a cable drum with adjustable rotation resistance, the framework is fixed on a support frame through a flange, the cable drum and the framework are coaxially arranged and can rotate, after the cable is fixedly connected with a terminal, the framework is rotated to complete the first circle of cable winding, the winding angle of the cable is adjusted based on the number of winding turns, and then the framework is rotated to continue winding, so that the cable is axially and tightly arranged on the framework;
after the winding of one layer of cable is finished, winding and climbing the cable along a gap between the end face of the first end plate or the second end plate and the last layer of cable until the wound cable is higher than the last layer of cable, then adjusting the winding angle of the first ring of cable on the layer based on the number of winding turns, and winding the cable behind the first ring as a reference;
after the first layer of cables is wound, the second end plate is moved along the axial direction to extrude the cables, and the second end plate and the framework are fixed relatively by using the locking bolts.
13. The method of claim 12 for winding a wound magnet based on a hts cable, characterized in that: and after the layer of cable is wound, winding the stainless steel strip on the layer of cable with a preset radial pretightening force to obtain the pretightening part of the layer.
14. The method of claim 12 for winding a wound magnet based on a hts cable, characterized in that: in S4, the position where the terminal is connected with the lead is heated to 150-200 ℃, and then the connecting position is filled with solder material.
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| CN114694893B (en) * | 2022-05-31 | 2022-09-09 | 西部超导材料科技股份有限公司 | Preparation method of superconducting cable for quantum computer |
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