WO2005008687A1 - 超電導線材及びそれを用いた超電導コイル - Google Patents
超電導線材及びそれを用いた超電導コイル Download PDFInfo
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- WO2005008687A1 WO2005008687A1 PCT/JP2004/009965 JP2004009965W WO2005008687A1 WO 2005008687 A1 WO2005008687 A1 WO 2005008687A1 JP 2004009965 W JP2004009965 W JP 2004009965W WO 2005008687 A1 WO2005008687 A1 WO 2005008687A1
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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
- H01F6/02—Quenching; Protection arrangements during quenching
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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
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/20—Permanent superconducting devices
- H10N60/203—Permanent superconducting devices comprising high-Tc ceramic materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2847—Sheets; Strips
- H01F27/2852—Construction of conductive connections, of leads
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2871—Pancake coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/346—Preventing or reducing leakage fields
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S505/00—Superconductor technology: apparatus, material, process
- Y10S505/70—High TC, above 30 k, superconducting device, article, or structured stock
- Y10S505/704—Wire, fiber, or cable
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S505/00—Superconductor technology: apparatus, material, process
- Y10S505/70—High TC, above 30 k, superconducting device, article, or structured stock
- Y10S505/704—Wire, fiber, or cable
- Y10S505/705—Magnetic coil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S505/00—Superconductor technology: apparatus, material, process
- Y10S505/825—Apparatus per se, device per se, or process of making or operating same
- Y10S505/879—Magnet or electromagnet
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S505/00—Superconductor technology: apparatus, material, process
- Y10S505/825—Apparatus per se, device per se, or process of making or operating same
- Y10S505/884—Conductor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S505/00—Superconductor technology: apparatus, material, process
- Y10S505/825—Apparatus per se, device per se, or process of making or operating same
- Y10S505/884—Conductor
- Y10S505/887—Conductor structure
Definitions
- the present invention relates to a superconducting wire rod used for electric equipment in which a flowing current fluctuates at high speed, for example, energy storage, magnetic field application, transformer, rear turtle, motor, generator, and the like, and a superconducting coil using the same.
- the force that induces a circulating current due to the difference between the induced voltages of the respective parallel conductors due to the magnetic flux generated by the flowing current In the case of ordinary conductors such as copper and aluminum, the impedance is The circulating current is approximately 90 ° out of phase with the load current because the resistance is mainly resistive. Therefore, for example, even if a circulating current of 30% occurs, the current flowing through one conductor is the vector sum of 100% of the load current and 30% of the circulating current with a 90 ° phase difference. Since the absolute value is the square root of the sum of the squares, it is about 105%, and the increase in the current value is small for the circulating current.
- the resistance that determines the circulating current is almost determined by the inductance since the resistance is almost zero in the superconducting state. Therefore, the circulating current has the same phase as the flowing current. If the circulating current is assumed to be 30%, the circulating current is added to the flowing current, and a current of 130% flows through the superconducting wire. When this current value reaches the critical current, the AC loss increases and the drift increases.
- the gist of the invention described in Patent Document 1 is as follows. That is, "multiple super The configuration is such that the superconducting coil formed by parallelizing and winding the wires is displaced only at the end of the winding, and the number of coil layers is four times the number of parallel superconducting wires in parallel.
- the number of dislocations can be reduced, and the unstable portion can be reduced while suppressing the circulating current.
- the circulating current can be suppressed with fewer unstable parts, as well as the work and time required for dislocations are reduced and the cost is reduced, so that high-speed excitation and demagnetization can be performed stably. Is also obtained. That is.
- FIG. 10 shows an example of a transposition configuration of the superconducting coil described in FIG. 1 of Patent Document 1.
- the superconducting wire 3a is wound on the winding frame la side.
- (Al, A2, A3) not shown are stacked in the order from the coil inner diameter, and at the dislocation part 2 at the end of the winding, (A3) is first bent to the next turn.
- (A2, A1) at the end of the winding on the winding frame lb side, for example, (A3, A2, A1).
- the number of bends of the dislocation portion winding is reduced as compared with the conventional dislocation configuration described in FIG.
- the superconducting coil is required to have a configuration in which heat generated due to AC loss or the like is effectively removed and stable operation can be performed without generating normal conduction dislocation.
- Patent Document 2 discloses “a good heat conductive material between layers of a superconducting winding wound in a cylindrical layer on the outer peripheral surface of a cylindrical winding frame made of an electrically insulating material.
- an oxide superconducting material is formed into a film on a flexible tape substrate.
- a manufacturing method using a vapor phase method such as a laser ablation method and a CVD method is being pursued.
- the superconducting film is exposed to the outermost layer and is exposed. The surface on the side has not been subjected to any stabilization treatment. Therefore, when a relatively large current is passed through such an oxide superconducting wire, the superconducting film locally transitions from the superconducting state to the normal conducting state due to local heat generation, and current transport is unstable. Was a problem.
- An oxide superconductor which solves the above problems, has a high critical current value, can carry out stable current transport, and whose stability does not decrease even after long-term storage, and an oxide superconductor Patent Document 3 discloses a tape-shaped superconducting wire having the following configuration for the purpose of providing a manufacturing method.
- a flexible tape substrate an intermediate layer formed on the tape substrate, an oxide superconducting film formed on the intermediate layer, and an oxide superconducting film formed on the oxide superconducting film having a thickness of 0.1 mm.
- a yttria-stabilized zirconia layer or a magnesium oxide layer is provided as an intermediate layer on a Hastelloy tape as a substrate, and Y—Ba—Cu —A ⁇ -based oxide superconducting film is formed, and a coating film made of gold or silver is formed on this film. ”
- Patent Document 4 has the following configuration with the aim of improving the thermal stability by effectively dissipating the heat generated by the AC loss by providing a normal conducting metal layer.
- a method for manufacturing a tape-shaped superconducting wire is disclosed.
- a plurality of long wave high-temperature superconducting thin films of a tape-like material having a high-temperature superconducting thin film adhered on a substrate surface are arranged in parallel at one or more intervals. Irradiation is performed in the longitudinal direction with long laser light to make the irradiated portion non-superconducting (normal conduction), and at the same time, the beam diameters and intervals between the plurality of long-wavelength laser lights are selected and the non-superconducting portion is selected.
- a method for controlling the width of a superconducting portion based on non-irradiation of a long-wavelength laser beam located at a high temperature superconducting wire is arranged in parallel at one or more intervals. Irradiation is performed in the longitudinal direction with long laser light to make the irradiated portion non-superconducting (normal conduction), and at the same time, the beam diameters and intervals between the plurality of long-wavelength laser lights are selected and the non-superconducting portion
- Patent Document 1 Japanese Patent Application Laid-Open No. 11-273935 (pages 2-4, FIGS. 1-4)
- Patent Document 2 JP-A-11-135318 (pages 2 to 4, FIG. 3)
- Patent Document 3 Japanese Patent Application Laid-Open No. 7-37444 (Pages 2-7, FIG. 1)
- Patent Document 4 JP-A-3-222212 (pages 11 and 2, FIG. 3)
- the AC loss generated in the superconducting wire depends on the shape of the flat tape. Due to the anisotropy, AC losses in a perpendicular magnetic field acting perpendicular to the flat surface of the tape become dominant. The reason is that the demagnetization generated due to the fluctuation of the magnetic field, that is, the magnetic moment m for canceling the magnetic field is the product of the shielding current i and the average distance of the shielding current. This is because the magnetic moment m, in which the average distance d of the flat surface is much larger than that in the thickness direction of the tape, becomes significantly larger in the vertical magnetic field acting on the flat surface.
- the current shunt be uniform without dislocation to suppress the circulating current.
- the vertical interlinkage magnetic flux acting on the superconducting wire be canceled in order to reduce the AC loss due to the shielding current.
- the superconducting wire be configured so that it can be cooled as uniformly as possible and the current carrying capacity can be increased.
- the present invention has been made in view of the above points, and an object of the present invention is to provide a superconducting wire capable of suppressing AC loss, and further provide a superconducting coil using the superconducting wire.
- An object of the present invention is to provide a superconducting coil having low loss.
- the present invention relates to a superconducting wire rod formed by forming a superconducting thin film on a substrate surface and forming at least a superconducting thin film portion having a rectangular cross section.
- the parallel conductor is electrically separated from the superconducting thin film portion and parallelized (invention of claim 1).
- a parallel conductor force formed by paralleling a plurality of superconducting thin film portions functions as a multifilament superconductor, can achieve a uniform current shunt, and is applied to a coil for AC equipment. In this case, the AC loss in the vertical magnetic field can be reduced.
- the tape-shaped superconducting wire disclosed in Patent Document 4 also has a superconducting thin film portion structurally separated, but a normal conducting thin film portion and a superconducting thin film portion are formed alternately. Therefore, eddy current loss occurs in the normal-conducting thin film portion and the loss increases.
- each conductor element of the parallel conductor is electrically connected. Therefore, the problem described in Patent Document 4 does not occur.
- the rectangular cross section depends on the manufacturing method, but may have various modifications such as a trapezoidal shape or a chamfered rectangular or trapezoidal shape depending on the case.
- the following inventions of claims 2 to 4 are preferable. That is, in the superconducting wire according to claim 1, a superconducting thin film formed on a substrate surface is provided with a normal conducting metal layer on an upper surface, and the parallel conductor electrically connects the metal layer and the superconducting thin film together. It shall be separated and parallelized (the invention of claim 2). Thereby, AC loss can be suppressed and thermal stability can be improved.
- a part of the parallel conductor that is electrically separated is a slit-shaped groove, and the slit-shaped groove is filled with an electrically insulating material;
- the entire periphery of the parallel conductor is covered with an electrically insulating material (the invention of claim 3).
- the slit-shaped groove is formed by, for example, laser etching, the groove is filled with an electrically insulating material such as epoxy resin, and the entire periphery of the parallel conductor is covered with the electrically insulating material.
- the superconducting thin film is a high-temperature superconducting thin film ( The invention of claim 4).
- the following claims 5 to 9 are preferable. That is, in the superconducting coil formed by winding the superconducting wire according to any one of claims 1 to 4 and the superconducting wire according to claim 1, due to a magnetic field distribution generated by the superconducting coil due to the structure or arrangement of the superconducting coil.
- a coil configuration is provided in which at least a portion of the vertical linkage magnetic flux that acts between the conductor elements of the conductor acts so as to cancel each other (claim 5).
- the portion where the vertical linkage magnetic flux acts to cancel each other out extends over all the superconducting wires constituting the superconducting coil.
- a small-sized coil is used.
- electrical connection of superconducting wire is often required. Even in such a case, it is desirable to adopt a configuration in which as many parts as possible cancel each other out.
- the winding method of the superconducting coil includes a cylinder winding method, a pancake winding method, a saddle winding method, and the like. In any of the winding methods, a vertical acting between the conductor elements of the parallel conductor is used. It is desirable that the interlinkage magnetic flux has a portion that acts so as to cancel each other as much as possible. Details will be described later.
- each conductor element of the parallel conductor of the superconducting wire is collectively provided in a part of the coil axial direction.
- the electric connection portion is provided at the end of the coil shaft (the invention of claim 7).
- a superconducting wire batch connection method for collectively connecting each conductor element of the parallel conductor of the superconducting wire, and a parallel conductor The conductor element separation connection method in which each of the conductor elements is electrically separated and connected is considered. From the viewpoint of manufacturing the coil, the batch connection method is easier, and when this method is adopted as the electrical connection portion, the electrical connection portion is connected to the coil shaft end portion as in the invention of claim 7. With this arrangement, the vertical interlinkage magnetic flux can be substantially entirely canceled out due to the symmetry in the coil axis direction. In the case where the conductor element separation connection method is adopted, the connection point does not need to be limited to the end of the coil shaft, and the vertical linkage magnetic flux can be canceled even if the connection is made at any place of the coil. Details will be described later.
- the superconducting coil according to claim 5 when the superconducting coil is a pancake winding type coil, a plurality of coil connecting portions for connecting between the two pancake coils are formed on the inner and outer peripheral portions of the coil. And at least a part of the coil connection portion is a conductor element separation connection type coil connection portion in which each conductor element of the parallel conductor of the superconducting wire is electrically separated and connected, and the remaining coil connection portion is provided.
- the coil connection part is provided on the inner and outer periphery of the coil so that the flux linkage of the vertical magnetic field acting between the conductor elements of the parallel conductor of each pancake coil as a whole cancels each other out (The invention of claim 8).
- a coil connection portion is usually provided between the outer peripheral portions of two adjacent coil pancakes.
- the interlinkage magnetic flux cannot be canceled each other.
- the vertical linkage magnetic flux can be substantially entirely canceled out. Details will be described later.
- the superconducting coil according to any one of claims 5 to 8 in the case of a superconducting coil formed by winding a plurality of layers, at least a part of the superconducting coil is made of a good heat conductive material. It is assumed that a cooling plate is provided (the invention of claim 9). Thereby, the thermal stability of the superconducting coil can be improved.
- the cooling method of the superconducting coil is not limited to the method of disposing the cooling plate as described above and cooling with a cryogenic liquid or gas. You can also.
- FIG. 1 is a schematic cross-sectional view of a superconducting wire showing an embodiment of the present invention.
- FIG. 2 is a schematic configuration diagram of a superconducting coil showing an embodiment of the present invention in which a cooling plate is provided.
- FIG. 3 is a schematic explanatory view of a superconducting coil according to the present invention formed by winding one turn in the coil axis direction, and a magnetic flux formed in the coil.
- FIG. 4 is an explanatory view of an electric connection portion and the like of a cylinder winding type superconducting coil according to the present invention.
- FIG. 5 is an explanatory diagram of a method for electrically connecting superconducting wires according to the present invention.
- FIG. 6 is an explanatory view of the arrangement of cylinder winding type superconducting coils according to the present invention.
- FIG. 7 is an explanatory view of an electrical connection portion and the like of a pancake winding type superconducting coil according to the present invention.
- FIG. 8 is an explanatory view of a toroidal arrangement of a superconducting coil according to the present invention.
- FIG. 9 is a diagram showing a schematic configuration and a magnetic field distribution of a conventional pancake wound superconducting coil.
- FIG. 10 is a diagram showing an example of a transposition configuration of a superconducting coil described in Patent Document 1.
- FIG. 1 is a schematic cross-sectional view of a superconducting wire according to an embodiment of the present invention, showing a configuration of a parallel conductor obtained by dividing a superconducting thin film into four parts.
- Fig. 1 (a) shows the superconducting conductor before division
- Fig. 1 (b) shows the parallel conductor after division by slit processing
- Fig. 1 (c) shows the parallel conductor after insulation coating.
- 31 is a substrate
- 32 is an intermediate layer
- 33 is a superconducting layer
- 34 is a metal layer
- 35 is a slit as a dividing groove
- 36 is an electrically insulating material.
- the part number 30 indicates a conductor element including the divided metal layer and the superconducting layer.
- an intermediate layer 32 as an electric insulating layer is provided on a Hastelo tape as a substrate 31, and a Y—Ba—Cu
- a _ ⁇ -based oxide superconducting film is formed, and a layer formed of a coating film made of, for example, gold or silver is used as the normal-conducting metal layer 34 thereon.
- the intermediate layer 32 for example, a two-layer structure in which a cerium oxide (Ce02) layer is formed on a gadolinium zirconium oxide (Gd2Zr207) layer is used.
- the superconducting conductor is slit in the longitudinal direction of the superconducting conductor, and as shown in FIG.
- the entire conductor is filled with a flexible electrically insulating material 36 such as epoxy resin or enamel to form a parallel conductor.
- a flexible electrically insulating material 36 such as epoxy resin or enamel to form a parallel conductor.
- FIG. 2 is a schematic diagram of a superconducting coil formed by winding a plurality of layers using the superconducting wire shown in FIG. 1, wherein a cooling plate 21 made of a good heat conductive material is disposed between the layers. Shows a typical configuration.
- superconducting wires 13a to 13d schematically show each of four divided segments of the parallel conductor in FIG. 1 (b).
- an embodiment of the invention related to the superconducting coil will be described with respect to its configuration, operation principle, and the like.
- a coil (solenoid coil) of the cylinder winding type will be described.
- FIG. 3 is a schematic explanatory view of a superconducting coil formed by winding the above-mentioned four divided parallel conductors one layer in the coil radial direction, and a magnetic flux formed in the coil.
- FIG. 3 (a) shows a schematic state diagram of magnetic flux lines in a cross-sectional view of the superconducting coil.
- Figs. 3 (b) and 3 (c) are viewed from the direction of arrow P in Fig. 3 (a).
- FIG. 3 (b) shows a schematic state diagram of the magnetic flux lines in the parallel conductor part divided into four parts, and
- FIG. 3 (b) shows that the superconducting layer has a slit but the surface is electrically conductive as disclosed in Patent Document 4.
- FIG. 3 (c) shows an embodiment of the present invention, in which a superconducting layer has a slit and is electrically insulated.
- FIG. 3 the same functional members as those in Fig. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
- reference numeral 40 denotes a winding frame of the superconducting coil
- 34a denotes a metal layer in which the surfaces of the superconducting layer 33 are electrically connected.
- the illustration of the intermediate layer 32 in FIG. 1 is omitted.
- the magnetic flux lines formed in the coil are indicated by arrows A in Fig. 3 and act on each superconducting layer 33 in the upper and lower parts in the coil axis direction.
- the directions of the magnetic flux lines A1 and A2 are opposite to each other. Therefore, as shown in FIG. 3 (b) and FIG. 3 (c), when the superconducting wire formed by winding one layer in the radial direction of the coil is shown in a flatly expanded manner, the superconducting wire is formed by the magnetic field distribution generated by the superconducting coil.
- each conductor element 30 of the parallel conductor acts on the superconducting wire as a whole to cancel each other out based on the axial symmetry of the superconducting coil, so that AC loss due to the vertical magnetic field is suppressed. Is done.
- the superconducting element wire has a width of 9 mm and a thickness of 0.1 mm.
- the current shunt ratio was calculated for a coil wound Omm, 30 turns in the coil axis direction, and 12 layers in the radial direction. As a result, the current shunting ratios of the three divisions are 0.3398, 0.3203, and 0.3399, respectively. It was confirmed that the occurrence of loss was reduced.
- the present invention is applicable to all winding type coils such as a pancake winding type, a cylinder winding type, and a saddle type winding type. If at least a part of the coil is provided with a portion in which the vertical linkage magnetic flux acting between the conductor elements acts to cancel each other out, the effect of the present invention according to the configuration can be obtained.
- the configuration of the coil and its operation and effect will be described in detail below with reference to specific examples of the cylinder winding method and the pancake winding method.
- the superconducting coil shown in FIG. 4 has an example in which a superconducting wire 50 is wound a plurality of turns in the coil axis direction and a plurality of layers are wound in the coil radial direction, and a cooling pipe 20 is provided between the layers.
- reference numeral 54 denotes a coil flange
- 55 denotes a winding frame.
- Reference numerals 50a, 50b, and 50c denote electric connection portions of the superconducting wires shown for convenience of explanation.
- the electrical connection portion includes a superconducting wire batch connection method of connecting the conductor elements of the parallel conductors of the superconducting wire collectively, and an electrical connection of each conductor element of the parallel conductor.
- a conductor element separation connection system in which the connection is performed by separating the conductor elements from each other.
- FIG. 5 (a) is a schematic plan view illustrating the conductor element separation connection method
- FIG. 5 (b) is a schematic plan view illustrating the superconducting wire batch connection method
- FIG. 5 (a) and 5 (b) are common schematic side sectional views taken along the line AA and the line BB, respectively.
- members having the same functions as the members shown in FIG. 1 are given the same reference numerals, and detailed description thereof will be omitted.
- the two superconducting wires 100a and 100b are connected to each other by conductor element connection members 70, respectively.
- Each conductor element 30 is electrically separated and connected.
- the electrical connection is made by, for example, a solder joint 75 as shown in FIG.
- the conductor elements 30 of the two superconducting wires 100a and 100b are electrically connected to the superconducting wire collective connecting member 80, respectively.
- the connection member 80 forms an electrode portion connected across the four conductor elements 30.
- FIG. 6 (a), (b), (c) is a diagram showing an example of the arrangement of a plurality of cylindrical superconducting coils (60a-60d). Due to the arrangement of the superconducting coils, the magnetic flux distribution generated by the superconducting coils causes the vertical interlinkage magnetic flux acting between the conductor elements of the parallel conductor to provide as much as possible a part that acts to cancel each other out. 6 (b) and FIG. 6 (c) are preferable. In the case of FIG. 6 (a), since the superconducting coils 60a and 60b and the force magnetic field distribution are asymmetric in the vertical direction, the AC loss is larger than that in FIG. 6 (b). The same is true even when there are many coils, and Fig. 6 (c) shows the case where there are four coils.
- FIG. 9 shows a schematic configuration and a magnetic field distribution of a conventional pancake winding type superconducting coil.
- the pancake winding method shown in Fig. 9 uses a superconducting tape.
- the pancake coils formed by concentrically winding the coils are laminated in the axial direction of the winding frame 4 via an electrical insulating member 9, and a coil connection portion 8 provided between the adjacent pancake coils at the outer periphery of the pancake And a multi-layer coil is formed in one winding frame.
- the electrical connection by the coil connection unit 8 is usually performed by the superconducting wire batch connection method.
- the superconducting coil shown in FIG. 9 generates a magnetic flux as schematically shown by the magnetic field lines 3. That is, a magnetic flux is generated mainly in the axial direction at the axial center of the coil, that is, in the direction parallel to the wide surface of the tape conductor. Of these, only the axial component is present at the center in the coil stacking direction, and the absolute value of the magnetic flux density is the maximum at the inscribed portion of the winding frame 4 of the tape conductor indicated by A in the figure.
- the absolute value of the magnetic flux density decreases.
- the radial direction that is, the tape A large magnetic flux having a component perpendicular to the wide surface of the conductor is generated, and particularly in the winding located at the B portion at both ends in the stacking direction, the component perpendicular to the wide surface becomes large.
- FIG. 7 is the same as the configuration of the superconducting coil shown in FIG. 9, and the coil connection portion 8 is a diagram following the conventional method of FIG. 9 for convenience of explanation.
- the part numbers Ao-Fo and Ai-Fi denote the coil connection part on the outer periphery and the coil connection part on the inner periphery of each pancake coil, respectively.
- connection is made in the following order up to Ao-Fo. That is, Ao Ai Bi Bo-Co Ci-Di Do-Eo Ei-Fi-Fo. In this case, as described above, the interlinkage magnetic flux cannot be canceled each other.
- connection examples of the present invention are as follows. First, when the connection of the superconducting wires between the pancake coils is all performed by the conductor element separation connection method, in a simple expression, like the solenoid coil, it can be written in one stroke. Can connect S. That is, in FIG. 7, the connection can be made as Ao-Ai-Bi-Bo-Co-Ci-Di-Do-Eo-Ei-Fi-Fo.
- the pancake coil in Fig. 7 is divided into three sets of pancake coils, with two sets of coils symmetrical upward and downward.
- the connection is made by the conductor element separation connection method, and the connection between the sets is the superconducting wire collective connection method.
- Ao Ai Fi Fo is connected in a one-stroke manner by a conductor element separation connection method, and the same applies to Bo Bi—Ei Eo and Co—Ci—Di—Do. Further, the superconducting wire collective connection method is used between Fo and Bo and between Eo and Co.
- Ao—Ai—Bi—Bo—Eo—Ei—Fi—Fo Co—Ci—Di—Do.
- the superconducting coil is a pancake winding type coil as described in claim 8
- a plurality of coil connecting portions for connecting the two pancake coils are provided on the inner and outer peripheral portions of the coil.
- At least a part of the coil connection part is a conductor element separation connection type coil connection part in which each conductor element of the parallel conductor of the superconducting wire is electrically separated and connected, and the remaining coil connection part is a superconducting wire. It is desirable to adopt a line collective connection method, and to provide coil connection portions on the inner and outer peripheral portions of the coil so that the flux linkage of the vertical magnetic field acting between the conductor elements of the parallel conductors of each pancake coil as a whole cancels each other.
- FIG. 7 shows a force S when the number of pancake coils is six, and a coil connection configuration in which the interlinkage magnetic fluxes cancel each other depending on the number when the number changes. It is necessary that Although FIG. 6 shows an example of the arrangement of the cylindrical superconducting coils, the same effect can be obtained by applying the superconducting coil of the present invention to a toroidal arrangement.
- Figure 8 shows multiple superconducting coils An example in the case of arrangement is shown. The superconducting coils 60a to 60f are arranged such that the respective coil centers are located on a circle having a predetermined toroidal radius.
- these superconducting coils are operated in such a manner that symmetry of the magnetic field distribution can be obtained from the viewpoint of electromagnetic force.
- the vertical interlinkage magnetic flux acting between the conductor elements of the parallel conductor behaves in the same manner as when operating a single coil. Therefore, even in the toroidal arrangement, the cylinder winding method or the pancake winding method is used. Regardless of the coil system, the AC loss can be reduced by applying the above-described coil of the present invention. The same is true even if the number of arranged coils changes.
- a superconducting wire formed by forming a superconducting thin film on a substrate surface and forming a tape at least the superconducting thin film portion is formed into a plurality of rectangular superconducting thin film portions. It shall be a parallel conductor that is electrically separated and parallelized,
- the vertical interlinkage magnetic flux acting between the respective conductor elements of the parallel conductor due to the magnetic field distribution generated by the superconducting coil due to the structure or arrangement of the superconducting coil By providing a coil configuration having at least a part that acts to cancel each other out,
- the present invention provides a superconducting wire capable of suppressing AC loss, and a superconducting coil using this superconducting wire has a simple structure without dislocation, and has a structure capable of canceling linkage magnetic flux due to a perpendicular magnetic field with respect to the wire, and having a vertical structure.
- the circulating current in the wire due to the magnetic field can be suppressed to make the current shunt uniform, thereby providing a low-loss superconducting coil.
- a superconducting wire in the case of a superconducting coil formed by winding a plurality of layers, a superconducting wire can be obtained by disposing a cooling plate made of a good heat conductive material between at least some of the layers. By cooling as uniformly as possible, the thermal stability of the superconducting coil can be improved.
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Abstract
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Priority Applications (4)
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JP2005511822A JP4657921B2 (ja) | 2003-07-17 | 2004-07-13 | 超電導線材及びそれを用いた超電導コイル |
EP04747431.7A EP1653485B1 (en) | 2003-07-17 | 2004-07-13 | Superconducting wire and superconducting coil employing it |
US10/514,194 US7453340B2 (en) | 2003-07-17 | 2004-07-13 | Superconducting wire and superconducting coil employing it |
US12/245,201 US7777602B2 (en) | 2003-07-17 | 2008-10-03 | Superconducting wire and superconducting coil made therewith |
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JP2003198235 | 2003-07-17 | ||
JP2003-198235 | 2003-07-17 |
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US10514194 A-371-Of-International | 2004-07-13 | ||
US12/245,201 Division US7777602B2 (en) | 2003-07-17 | 2008-10-03 | Superconducting wire and superconducting coil made therewith |
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WO2005008687A1 true WO2005008687A1 (ja) | 2005-01-27 |
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US (2) | US7453340B2 (ja) |
EP (1) | EP1653485B1 (ja) |
JP (1) | JP4657921B2 (ja) |
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Also Published As
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US7777602B2 (en) | 2010-08-17 |
US20060077025A1 (en) | 2006-04-13 |
JP4657921B2 (ja) | 2011-03-23 |
EP1653485B1 (en) | 2016-12-14 |
EP1653485A4 (en) | 2008-07-02 |
JPWO2005008687A1 (ja) | 2007-09-20 |
EP1653485A1 (en) | 2006-05-03 |
US20090170708A1 (en) | 2009-07-02 |
US7453340B2 (en) | 2008-11-18 |
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