JP2011171625A - Superconducting coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superconducting coil capable of preventing the occurrence of a quench phenomenon by reducing the number of portions contacting a displaced superconducting wire material or a binding member without strongly restraining the superconducting wire material, even if the superconducting wire material displaces. <P>SOLUTION: In the superconducting coil 10, a width 8a of an outermost axial direction P of the binding member 8 is made shorter than a width 15a of an axial direction P of the superconducting wire material 12 wound around a barrel 1. Thus, the binding member 8 or the superconducting wire material 12 is prevented from contacting a flange portion 1a or an end cheek 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a superconducting coil capable of preventing a quench phenomenon.

  Conventionally, as shown in FIG. 1, a superconducting coil 100 for generating a strong magnetic field includes a cylindrical body 1 and a pair of flange parts 1a and 1b extending from the body 1 in the radially outward direction O. The superconducting wire 12 is wound around the winding frame 2 having a substantially spiral shape, and the binding member 8 is wound around the outer peripheral surface of the superconducting wire 12, and is cooled to an extremely low temperature (about 4.2K). It is excited by energization (for example, Patent Document 1).

  In such a superconducting coil 100, as shown in FIG. 2A, when the superconducting coil 100 is in an excited state, the superconducting wire 12 (here, a wound state) is generated by the interaction between the energized current and the magnetic field generated by itself. The component force F1 of the hoop force in the radially outward direction O that attempts to expand the aggregated superconducting wire rods in the radially outward direction O acts on the superconducting wire 12. Under the influence of the component force F1 of the hoop force in the radially outward direction O and the position of the center of gravity of the superconducting wire 12, the superconducting wire 12 is removed from the reel 2 as shown in FIGS. Displace to tilt away. For this reason, there is a risk that the frictional heat is generated at the contact portions 12a, 12b, and 12c between the displaced superconducting wire 12 or the binding member 8 and the flange portions 1a, 1b, or the trunk portion 1, and a quench phenomenon occurs. Here, the quench phenomenon means that when the superconducting coil is in an excited state, the superconducting state is triggered by heat generated when a mechanical crack in the superconducting coil or the superconducting wire peels off or slips from the reel. Is a phenomenon that disappears and becomes a normal conducting state.

  In order to eliminate the risk, for example, a technique as disclosed in Patent Document 2 has been proposed. In Patent Document 2, when a superconducting coil is excited, an outer hoop force and an axial compressive force act on the superconducting wire layer due to the interaction between the energizing current and the magnetic field generated by itself. Since the layer is firmly held by the pair of flange portions and the intermediate member, the displacement in the superconducting wire constituting the superconducting wire layer can be suppressed, and the occurrence of the quench phenomenon due to the generation of frictional heat can be prevented. .

JP 2007-214466 A JP 2008-71789 A

  However, it can be said that the configuration as described in Patent Document 2 has an advantage that the superconducting wire layer is hardly displaced because the superconducting wire layer is firmly held by the pair of flange portions and the intermediate member. However, once the superconducting wire layer, which is firmly held, slips on the winding frame, the frictional heat at that time increases, and there is a risk that a large quench phenomenon occurs.

  Therefore, the present invention has been made to solve the above-described problems, and its purpose is not to restrain the superconducting wire strongly (winding loosely), even if the superconducting wire is displaced. It is an object of the present invention to provide a superconducting coil capable of preventing the occurrence of a quench phenomenon by reducing the chances of occurrence of the quench phenomenon by reducing the number of places in contact with the superconducting wire or binding member.

  A superconducting coil according to a first aspect of the present invention for solving the above problems includes a winding frame including a cylindrical body portion and a pair of flange portions extending radially outward from the body portion, and the body A superconducting wire wound around the portion and a binding member provided on the outer periphery of the superconducting wire, and the width of the outermost periphery of the binding member in the axial direction of the trunk portion of the superconducting wire wound around the trunk portion It is shorter than the width | variety of the said trunk | drum axial direction, It was characterized by the said bind member and the said flange part not contacting.

  According to the above configuration, by providing the binding member on the outer periphery of the superconducting wire, the distance at which the superconducting wire is separated from the winding frame is regulated to a certain level by the hoop force acting when the superconducting coil is in an excited state. Thereby, it can control that it shifts | deviates greatly in a radial direction in the contact location of a superconducting wire and a flange part, and it can make it difficult to cause the quench phenomenon by the frictional heat in the contact location of a superconducting wire and a flange part.

  Further, the width of the outermost outer periphery of the binding member in the axial direction of the trunk portion is made shorter than the width of the superconducting wire wound around the trunk portion of the winding frame so that the binding member and the flange portion do not contact each other. Yes. Thus, in the superconducting coil in an excited state, the superconducting wire is generated by the component force in the radially outward direction of the hoop force that causes the superconducting wire to expand in the radially outward direction due to the interaction between the energized current and the magnetic field generated by itself. Can be prevented from coming into contact with the binding member provided on the outer periphery of the displaced superconducting wire and the flange portion, and the quenching phenomenon due to the displacement of the superconducting wire can be made difficult to occur.

  The second invention is the superconducting coil according to the first invention, wherein the binding member is made of a material whose thermal shrinkage rate is larger than that of the superconducting wire, and the superconducting coil is excited. When the state is in the state, the width of the outermost periphery of the binding member in the trunk portion axial direction is shorter than the width of the superconducting wire wound around the trunk portion in the trunk portion axial direction, and the binding member and the flange portion It is characterized by not touching.

  According to the above configuration, when the superconducting coil is in an excited state by using a material whose thermal contraction rate is larger than that of the superconducting wire for the binding member, the outermost body of the binding member The width in the axial direction can be made shorter than the width in the axial direction of the body part of the superconducting wire wound around the body part of the reel, so that even if the superconducting wire is displaced, the binding member does not come into contact with the flange part. Can be. Thereby, the quenching phenomenon due to the contact between the binding member and the flange portion can be prevented.

  Moreover, 3rd invention is the superconducting coil which concerns on 1st or 2nd invention, WHEREIN: The said bind member is a wire wound around the outer periphery of the said superconducting wire, Comprising: The said trunk | drum axial direction of the said winding frame The number of layers is gradually reduced toward the outside.

  According to said structure, the wire which can be wound around the outer periphery of a superconducting wire is used for a bind member, and it can wind in layers so that the number of lamination | stacking may reduce gradually toward the trunk | drum axial direction outer side of a winding frame. As a result, when the superconducting coil is in an excited state, the width of the outermost periphery of the binding member in the axial direction of the trunk can be made shorter than the width of the superconducting wire wound around the trunk in the axial direction of the trunk. Even if the wire rod is displaced, the quench phenomenon can be prevented by preventing the binding member and the flange portion from contacting each other.

  According to a fourth invention, in the superconducting coil according to any one of the first to third inventions, a spacer portion is provided between one or both of the paired flange portions and the binding member, and the spacer By removing the portion, a space portion is provided between one or both of the flange portions and the binding member.

  According to the above configuration, the spacer portion provided between one or both of the paired flange portions and the binding member is removed, so that one or both of the paired flange portions and the binding member are removed. A space can be provided. Thus, when the superconducting coil is in an excited state, even if the superconducting wire is displaced, a space is provided between the flange portion and the binding member, so that the flange portion and the binding member are in contact with each other. It is possible to prevent the quench phenomenon.

  A superconducting coil according to a fifth aspect of the present invention is a winding frame including a cylindrical body portion and a pair of flange portions extending radially outward from the body portion, and wound around the body portion. A superconducting wire and a binding member provided on an outer periphery of the superconducting wire, and by removing a portion of the flange portion adjacent to the binding member, between one or both of the flange portions and the binding member; A space portion is provided.

  According to said structure, the part adjacent to the bind member of a flange part can be removed. Thus, in the superconducting coil in an excited state, the superconducting wire is generated by the component force in the radially outward direction of the hoop force that causes the superconducting wire to expand in the radially outward direction due to the interaction between the energized current and the magnetic field generated by itself. Even if the displacement is caused, the binding member and the flange portion can be prevented from coming into contact with each other, and the quenching phenomenon caused by the contact between the binding member and the flange portion can be prevented.

  Without super-constraining the superconducting wire, even if the superconducting wire is displaced, the occurrence of the quenching phenomenon is prevented by reducing the chance of the quenching phenomenon by reducing the number of places that come into contact with the displaced superconducting wire or the binding member. It is possible to provide a superconducting coil that can be used.

It is front sectional drawing of the conventional superconducting coil. (A) It is explanatory drawing explaining the force relationship which acts on a superconducting wire, when the conventional superconducting coil is made into an excitation state. (B) It is explanatory drawing which showed the displacement location of the superconducting wire in the conventional superconducting coil, and the contact location of a superconducting wire and a bind member, and a flange part. FIG. 3 is an enlarged view of the superconducting coil shown in FIG. It is front sectional drawing of the superconducting coil which concerns on 1st Embodiment. (A) It is a sectional side view of a superconducting coil. (B) It is front sectional drawing of a superconducting coil. It is front sectional drawing of the superconducting coil which concerns on 2nd Embodiment. It is explanatory drawing explaining the method of winding a binding member around a superconducting wire. It is front sectional drawing of the superconducting coil which concerns on 3rd Embodiment. It is explanatory drawing explaining the manufacturing process of the superconducting coil which concerns on 3rd Embodiment. 6 is a front sectional view of a superconducting coil according to Modification 1. FIG. 10 is a front sectional view of a superconducting coil according to Modification 2. FIG. 10 is a front sectional view of a superconducting coil according to Modification 3. FIG.

(First embodiment)
Hereinafter, a first embodiment for carrying out the present invention will be described with reference to the drawings. FIG. 4 is a front sectional view of the superconducting coil 10 according to the first embodiment. FIG. 5A is a side sectional view of the superconducting coil 10. FIG. 5B is a front sectional view of the superconducting coil 10.

(Configuration of superconducting coil 10)
The superconducting coil 10 is configured to be excited by energizing in a state cooled to a cryogenic temperature (about 4.2 K in the present embodiment). Specifically, as shown in FIG. 4, the superconducting coil 10 in the first embodiment includes a substantially cylindrical body 1 and a pair of flange portions 1 a extending from the body 1 in the radially outward direction O. -Between the winding frame 2 containing 1b, the superconducting wire 12 wound around the trunk | drum 1 of the winding frame 2, the bind member 8 provided in the outer periphery of the superconducting wire 12, and the trunk | drum 1 and the superconducting wire 12 And the end cheeks 3 and 4 interposed between the flange portions 1 a and 1 b and the superconducting wire 12.

  The body portion 1 having a substantially cylindrical shape is made of aluminum, an aluminum alloy, stainless steel, or the like. The flange portions 1 a and 1 b are integrally formed with the body portion 1 so as to extend from the body portion 1 in the radially outward direction O. And the winding frame 2 comprised by the flange parts 1a * 1b paired with the trunk | drum 1 becomes a base around which the superconducting wire 12 is wound.

  The superconducting wire 12 is tightly wound around the body 1 of the winding frame 2 in a substantially spiral shape (or aligned winding). In the first embodiment, the superconducting wire 12 is wound around the trunk portion 1 so that there are 50 turns per layer, and is wound so that it becomes 30 layers (In FIGS. 19 turns per layer, 6 layers are shown). Further, in the first embodiment, the superconducting wire 12 is wound around the body 1 by the component force F1 of the hoop force acting in the radially outward direction O when the superconducting coil 10 is in an excited state. A superconducting wire 12 is wound around the body 1 so as to be loosened to the extent that it is separated from the winding frame 2. In other words, the winding strength of the superconducting wire 12 around the body 1 is set so that all or part of the inner surface of the superconducting wire 12 is lifted by the hoop force due to electromagnetic force when the superconducting coil 10 is in an excited state. The degree of adjustment is preferable (details will be described later). A glass cloth 6 made of a polyethylene terephthalate (PET) sheet or glass is wound between the layers of the superconducting wire 12.

  Examples of the material of the superconducting wire 12 include NbTi, Nb3Sn, and Nb3Al. When Nb3Sn or Nb3Al is used as the material of the superconducting wire 12, heat treatment (about 700 ° C.) is performed after winding around the body portion 1, so that the insulating sheet 5 and end cheeks 3 and 4 have heat resistance. You need to select the right material.

  Furthermore, the superconducting wire 12 is impregnated with an adhesive 31 such as an epoxy resin. By doing so, the superconducting wire 12 and the laminated PET sheet or glass cloth 6 made of glass are bonded to each other and solidified, and it is possible to prevent peeling between them.

  The binding member 8 is provided on the outer periphery of the superconducting wire 12. The binding member 8 is disposed so as to be in contact with the outer periphery of the superconducting wire 12 at a normal temperature or in a state having a slight gap. The superconducting coil 10 is in an excited state, and the superconducting wire 12 is in the winding frame 2. It is provided in order to regulate the distance away from a certain level. Further, as shown in FIG. 4, the width 8 a in the axial direction P of the outermost periphery of the binding member 8 is made shorter than the width 15 a in the axial direction P of the body portion 1 of the superconducting wire 12 wound around the body portion 1. The member 8 and the flange portions 1a and 1b or the end cheeks 3 and 4 are configured not to contact each other. The binding member 8 is made of aluminum. Here, examples of the material of the binding member 8 include aluminum alloys other than the above aluminum, stainless steel, brass, copper, copper alloy, titanium, titanium alloy, and the like.

  The bind member 8 has a width 8 a shorter than a width 15 a of the superconducting wire 12 before the superconducting coil 10 is excited. However, the present invention is not limited to this, and a material whose thermal contraction rate is larger than that of the superconducting wire 12 is used for the binding member 8, and when the superconducting coil 10 is in an excited state, the width 8 a of the binding member 8 is As a result (when in an excited state), the width 8a of the bind member 8 becomes shorter than the width 15a of the superconducting wire 12, and the bind member 8 and the flange portions 1a and 1b or the end cheeks 3 and 4 are in contact with each other. You may make it the structure which does not. For example, when NbTi, Nb3Sn, or Nb3Al is used for the superconducting wire 12, aluminum may be used for the binding member 8.

  The insulating sheet 5 is made of a resin sheet made of resin such as polyethylene, Teflon (PTFE) (registered trademark), polyethylene terephthalate (PET) or the like with a thickness of about several hundred μm. The insulating sheet 5 is wound around the body 1. The insulating sheet 5 insulates the body 1 from the superconducting wire 12.

  The end cheeks 3 and 4 are arranged so that the flange portions 1a and 1b are in contact with the opposing surfaces. Although not shown, the end cheeks 3 and 4 each have a ring shape, and have a plurality of slits formed so as to be cut in the radial direction from the opening end of the outer edge portion toward the inside. Further, the end teaks 3 and 4 are ring-shaped members having a thickness of about 0.5 mm to 2 mm made of a hardly-adhesive polymer material such as Teflon (PTFE). The width of the slit is about 0.5 mm to 2 mm. In addition, although the slit has reached from the outer edge to the inner edge only at one place, it is easily attached by sandwiching the slit part opened by shifting the slit part in the opposite direction and deforming it. To be able to.

(Regarding winding strength)
In the description of the superconducting wire 12, the winding strength of the superconducting wire 12 around the body portion 1 of the winding frame 2 is based on the component force F1 in the radially outward direction O of the hoop force acting when the superconducting coil 10 is in an excited state. It is assumed that the superconducting wire 12 is wound around the body 1 so that the superconducting wire 12 becomes loose enough to be separated from the winding frame 2. The winding strength that satisfies the above conditions is defined as the surface pressure (P) at which the inner surface of the superconducting wire 12 presses the body 1 and will be described below with reference to FIG. In addition, the numerical value which concerns on a surface pressure (P) shall take a positive value toward the trunk | drum 1 direction from the superconducting wire 12 inner surface.

First, as shown in FIG. 5, there is a superconducting coil 10 in which a superconducting wire 12 is wound around a body portion 1 having an inner radius R and a thickness t ₂ with tension until the thickness t ₁ is reached. At this time, the circumferential stress acting on the superconducting wire 12 is σ _θc and the compressive stress acting on the body 1 is σ _θf . Here, the superconducting coil 10 is a thin-walled cylinder having an inner radius R, and the surface pressure (P _a ) at which the inner surface of the superconducting wire 12 presses the body 1 in a state where the superconducting coil 10 is not excited is generally expressed by the following equation (1). It becomes like this.
P _a = (t ₁ / R) · σ _θc (1)

Further, the thermal expansion coefficient of the superconducting wire 12 is α _c , and the thermal expansion coefficient of the winding frame 2 is α _f . Further, when the superconducting wire 12 is NbTi and the body 1 is made of aluminum, a relationship of α _c > α _f is established. When the temperature is changed by ΔT when the superconducting coil 10 is energized under such conditions, the superconducting wire 12 generates thermal stress (σ _cc ) that reduces the circumferential stress σ _θc expressed by the following equation (2). To do.
σ _cc = Em (α _c −α _f ) ΔT (2)
(Em is the Young's modulus of the superconducting coil 10)
Accordingly, the circumferential stress σ _θcc acting on the superconducting wire 12 after the temperature has changed by ΔT is expressed by the following equation (3).
σ _θcc = σ _{θc −σ cc} = σ _θc −Em (α _c −α _f ) ΔT (3)

Further, when the superconducting coil 10 is in an excited state, a hoop force is applied to the superconducting wire 12 so as to swell in the radially outward direction O of the winding frame 2. Since this hoop force acts only on the superconducting wire 12, if the force acting in the circumferential direction of this hoop force is σ _θe , the circumferential stress σ _θce acting on the superconducting wire 12 in the excited state is expressed by the following equation (4). The
σ _θce = σ _{θcc −σ θe} = σ _θc −Em (α _c −α _f ) ΔT−σ _θe (4)

Therefore, the surface pressure (P _ae ) at which the inner surface of the superconducting wire 12 presses the body 1 when the superconducting coil 10 is in the excited state is the following equation in which σ _θce in equation (4) is applied to σ _θc in equation (1). It is represented by (5).
P _ae = (t ₁ / R) · (σ _θc −Em (α _c −α _f ) ΔT−σ _θe ) (5)

The winding strength of the superconducting wire 12 around the body 1 is theoretically 0 or less in surface pressure (P _ae ) at which the inner surface of the superconducting wire 12 presses the body 1 when the superconducting coil 10 described above is in an excited state. A state in which (a negative value including 0) is obtained is preferable (see Expression (6)). However, since the surface pressure is only positive, the wrapping strength of the superconducting wire 12 around the body 1 is lifted by the hoop force by the electromagnetic force on the whole or part of the inner surface of the superconducting wire 12 when the superconducting coil 10 is in an excited state. Thus, it is preferable to adjust the winding tension. Note that the superconducting wire 12 is wound around the body 1 so that the surface pressure (P _ae ) at which the inner surface of the superconducting wire 12 presses the body 1 when the superconducting coil 10 is not excited is larger than zero.
P _ae ≦ 0 (6)

  Although the winding strength of the superconducting wire 12 around the body portion 1 has been described above, since there are elements that are simplified and omitted when obtaining the above formula and the like (omission of the binding member 8 and the like), they are only approximate and average. This is a relational expression. In order to obtain a more practical value, the current value at the time of excitation of the superconducting coil 10, elements of the binding member 8, deformation of the body 1, the winding frame 2, and the superconducting wire 12 at the time of excitation are taken into consideration. Derived calculations should be performed by the finite element method.

  When the superconducting coil 10 configured as described above is in an excited state, as shown in FIG. 4, the superconducting wire 12 is expanded in the radially outward direction O of the body 1 by the interaction between the energized current and the magnetic field generated by itself. The component force F <b> 1 of the hoop force in the radial direction O acts on the superconducting wire 12. Under the influence of the component force F1 of the hoop force in the radially outward direction O and the position of the center of gravity of the superconducting wire 12, the superconducting wire 12 is displaced away from the winding frame 2 (see FIG. 4). . At this time, there is a contact point between the displaced superconducting wire 12 or the binding member 8 and the flange portions 1a and 1b (end cheeks 3 and 4) or the trunk portion 1. Specifically, as shown in FIG. 4, they are the contact locations 12a, 12b, and 12c. If the contact pressure at the contact portions 12a, 12b, and 12c is high, frictional heat is generated when the superconducting wire 12 is separated from or displaced from the winding frame 2, and a quench phenomenon may occur.

  In this regard, in the superconducting coil 10 according to the first embodiment, the wrapping strength of the superconducting wire 12 around the body portion 1 is set to a component force in the radially outward direction O of the hoop force acting when the superconducting coil 10 is in an excited state. The superconducting wire 12 is loosened to the extent that it is separated from the winding frame 2 by F1. As a result, in the superconducting coil 10 in the excited state, the superconducting wire 12 is separated from the winding frame 2 (body 1), the contact pressure at the contact location 12c can be reduced, and the frictional heat at the contact location 12c. The quenching phenomenon due to can be made difficult to occur.

  In this way, when the winding strength of the superconducting wire 12 around the body portion 1 is loosened, when the superconducting coil 10 is in an excited state, the superconducting wire 12 is excessively separated from the winding frame 2 (body portion 1), and the superconducting wire 12 is There is a possibility that a quenching phenomenon occurs due to frictional heat caused by a large shift in the radially outward direction O at the contact location 12b. Therefore, by providing the binding member 8 on the outer periphery of the superconducting wire 12, the distance that the superconducting wire 12 is separated from the winding frame 2 in the excited state is restricted to a certain level. Thereby, it can control that superconducting wire 12 shifts greatly in diameter direction O in contact part 12b, and it can make it difficult to cause a quench phenomenon by frictional heat in contact part 12b.

  When the binding member 8 is provided on the outer periphery of the superconducting wire 12 in this way, the superconducting wire 12 is displaced away from the winding frame 2 and tilted when the superconducting coil 10 is in an excited state in the conventional configuration. The end portion of the binding member 8 provided on the outer periphery of the superconducting wire 12 and the flange portion 1a come into contact with each other at the contact location 12a (see FIGS. 2 and 3). Then, when the superconducting wire 12 is displaced at the contact location 12a, frictional heat is generated, which may cause a quench phenomenon. Therefore, the width 8a in the axial direction P of the outermost periphery of the binding member 8 is made shorter than the width 15a in the axial direction P of the superconducting wire 12 wound around the body portion 1, so that the binding member 8 and the flange portion 1a or end cheek 3 To avoid contact. Thereby, even if the superconducting wire 12 is displaced in the superconducting coil 10 in an excited state, the binding member 8 provided on the outer periphery of the displaced superconducting wire 12 and the flange portion 1a or the end cheek 3 itself are in contact with each other. It is possible to prevent the quenching phenomenon caused by frictional heat at the contact location 12a.

  When a material whose thermal contraction rate is larger than the thermal contraction rate of the superconducting wire 12 is used for the bind member 8, the width 8a of the bind member 8 contracts when the superconducting coil 10 is in an excited state. As a result, the width 8a of the binding member 8 is shorter than the width 15a of the superconducting wire 12, and even if the superconducting wire 12 is displaced, the binding member 8 and the flange portions 1a and 1b or the end cheeks 3 and 4 do not contact each other. Thereby, the quench phenomenon by the binding member 8 and flange part 1a * 1b or the end cheeks 3 * 4 contacting can be prevented.

(Second Embodiment)
Hereinafter, a superconducting coil 50 according to a second embodiment for carrying out the present invention will be described with reference to the drawings. FIG. 6 is a front sectional view of the superconducting coil 50 according to the second embodiment. FIG. 7 is an explanatory diagram for explaining a method of winding the bind member 58 around the superconducting wire 12. In addition, description is abbreviate | omitted for the location similar to 1st Embodiment, and it demonstrates centering around a different structure.

(Configuration of superconducting coil 50)
A superconducting coil 50 in the second embodiment shown in FIG. 6 includes a substantially cylindrical body 1 and a pair of flanges 1a and 1b extending from the body 1 in the radially outward direction O. The superconducting wire 12 wound around the body 1, the binding member 58 wound around the outer periphery of the superconducting wire 12, the insulating sheet 5 interposed between the body 1 and the superconducting wire 12, and the flange portion 1 a. -The end cheeks 3 and 4 interposed between 1b and the superconducting wire 12 are provided.

  The bind member 58 wound around the outer periphery of the superconducting wire 12 is a wire formed of a high-strength fiber material impregnated with steel wire / resin. The binding member 58 is provided to regulate the distance that the superconducting wire 12 is separated from the winding frame 2 to a certain level when the superconducting coil 50 is excited. As shown in FIG. 6, the bind member 58 is wound around the outer periphery of the superconducting wire 12 in a layered manner, and the number of layers is gradually reduced toward the outside in the axial direction P of the winding frame 2. That is, the binding member 58 is wound around the outer periphery of the superconducting wire 12 so that the number of layers is reduced continuously or stepwise toward the end of the superconducting wire 12.

  When the binding member 58 is wound around the superconducting wire 12 as described above, as shown in FIG. 7, a Teflon C-shaped jig member 52 is attached to the end cheeks 3 and 4 (flange each time one layer is wound. It is made to fit between the parts 1a and 1b) and the binding member 58. Specifically, the first layer 58 a of the bind member 58 is wound around the superconducting wire 12. Thereafter, the jig members 52 a and 52 d are fitted into the end portions of the first layer 58 a of the bind member 58. Then, the second layer 58b of the bind member 58 is wound between the jig material 52a and the jig material 52d. Next, the jig members 52b and 52e having a width larger than the jig members 52a and 52d are fitted into the end portions of the second layer 58b of the bind member 58. Then, the third layer 58c of the bind member 58 is wound between the jig material 52b and the jig material 52e. Next, jig materials 52c and 52f having a width larger than the jig materials 52b and 52e are fitted into the end portions of the third layer 58c of the bind member 58. Then, the fourth layer 58d of the bind member 58 is wound between the jig material 52c and the jig material 52f. Then, after the bind member 58 is solidified with an adhesive or the like, the jig members 52a, 52b, 52c, 52d, 52e, and 52f are removed. By using such a jig member 52, the binding member 58 is wound around the outer periphery of the superconducting wire 12 relatively easily toward the end of the superconducting wire 12 so as to reduce the number of layers continuously or stepwise. be able to.

  By configuring in this way, the width 58a in the axial direction P of the outermost periphery of the binding member 58 can be made shorter than the width 15a in the axial direction P of the body 1 of the superconducting wire 12 wound around the body 1. Even if the superconducting wire 12 is displaced when the superconducting coil 50 is in an excited state, the quenching phenomenon can be prevented by preventing the bind member 58 from contacting the flange portions 1a and 1b or the end cheeks 3 and 4.

(Third embodiment)
Hereinafter, a superconducting coil 60 according to a third embodiment for carrying out the present invention will be described with reference to the drawings. FIG. 8 is a front sectional view of the superconducting coil 60 according to the third embodiment. 8A is a front sectional view of the superconducting coil 60 before the spacer portions 61 and 62 are removed, and FIG. 8B is a front sectional view of the superconducting coil 60 after the spacer portions 61 and 62 are removed. It is. FIG. 9 is an explanatory diagram explaining the manufacturing process of the superconducting coil 60 according to the third embodiment. In addition, description is abbreviate | omitted for the location similar to 1st Embodiment, and it demonstrates centering around a different structure.

(Configuration of superconducting coil 60)
A superconducting coil 60 according to the third embodiment shown in FIG. 8B includes a substantially cylindrical body portion 1 and a pair of flange portions 1 a and 1 b extending from the body portion 1 in the radially outward direction O. The winding frame 2, the superconducting wire 12 wound around the body portion 1, and the binding member 68 wound around the outer periphery of the superconducting wire 12 (the binding member 68 is formed of a high-strength fiber material impregnated with steel wire / resin. A wire), an insulating sheet 5 interposed between the body 1 and the superconducting wire 12, and end cheeks 3 and 4 interposed between the flanges 1a and 1b and the superconducting wire 12. . Also, spacer portions 61 and 62 described later are removed between the end teak 3 (flange portion 1a) and the binding member 68 and between the end teak 4 (flange portion 1b) and the binding member 68 in the manufacturing process. Spaces 63 and 64 that are formed later are provided.

(Manufacturing process of superconducting coil 60)
Next, with reference to FIG. 9, the manufacturing process of the superconducting coil 60 which concerns on 3rd Embodiment is demonstrated.

  First, by forming a cylindrical body portion 1 formed of aluminum, aluminum alloy, stainless steel, or the like, flange portions 1a and 1b extending in the radially outward direction O from the body portion 1 are formed. (Reel preparation step).

  Next, the slit portion reaching from the outer edge to the inner edge of the end cheeks 3 and 4 is opened by being shifted in the opposite direction and deformed. The end cheeks 3 and 4 are attached to the reel 2 so that the flanges 1a and 1b are in contact with each other by sandwiching the opened slit portion in the reel 2. Next, an insulating sheet 5 made of polyethylene, Teflon (PTFE), polyimide, or polyethylene terephthalate (PET) resin and having a thickness of several hundred μm is wound around the body 1.

  Next, as shown in FIG. 9A, the superconducting wire 12 is tightly wound around the body 1 in a substantially spiral shape (or aligned winding) (winding step). Here, the superconducting wire 12 is wound around the trunk 1 so as to have 50 turns per layer, and wound so that it becomes 30 layers. Note that the winding strength is the same as in the first embodiment. At this time, a glass cloth 6 made of a polyethylene terephthalate (PET) sheet or glass is wound between the layers of the superconducting wire 12. In FIG. 9, for simplicity, 19 turns per layer and 6 layers are illustrated.

  Next, as shown in FIG. 9 (A), an epoxy resin adhesive 31 is sprayed and applied to the superconducting wire 12 from the sprayer 30 and penetrated. Thereafter, the adhesive 31 permeated into the superconducting wire 12 is cured by heating called cure that has been reacted by self-heating. By doing in this way, it will be in the state which the superconducting wire 12 and the laminated | stacked PET sheet | seat or the glass cloth 6 made of glass adhere | attached and solidified. That is, the superconducting wire 12 can be made less likely to lose its shape.

  Next, as shown in FIG. 9B, the C-shaped spacer portions 61 and 62 are fitted into the end portions of the outer peripheral surface of the superconducting wire 12 so as to be in contact with the inner surfaces of the end cheeks 3 and 4 (spacer portion installation step). ). Here, non-adhesive resin such as Teflon is used for the spacer portions 61 and 62, or surface treatment such as Teflon coating is performed using aluminum or iron so that it can be easily removed from the superconducting wire 12. ing. In the third embodiment, C-shaped spacer portions 61 and 62 are used. However, the spacer portions 61 and 62 are not limited to this, and can be easily fitted into the superconducting wire 12 and removed from the superconducting wire 12. If so, the spacer portions 61 and 62 may be divided into two parts, divided into three or four parts, or may have a plurality of slits as in the end cheeks 3 and 4. Thereby, the bind member 68 can be positioned and wound on the outer peripheral surface of the superconducting wire 12 sandwiched between the spacer portion 61 and the spacer portion 62.

  Next, as shown in FIG. 9C, the bind member 68 is tightly wound in a substantially spiral shape (or aligned winding) on the outer peripheral surface of the superconducting wire 12. Here, the binding member 68 is wound on the outer peripheral surface of the superconducting wire 12 so that there are 50 turns per layer, and is wound so that it becomes four layers (binding step). In FIG. 9, for simplicity, 41 turns per layer and two layers are illustrated. Thereafter, the bind member 68 is applied and hardened with an adhesive or the like.

  Finally, as shown in FIG. 9 (D), after the adhesive 31 permeated into the superconducting wire 12 and the adhesive applied to the binding member 68 are sufficiently cured, the outer peripheral surface end of the superconducting wire 12 Remove the spacer portions 61 and 62 fitted in (spacer portion removing step). As a result, as shown in FIG. 9D, the space 63 between the end cheek 3 (flange portion 1 a) and the binding member 68 and between the end cheek 4 (flange portion 1 b) and the binding member 68. -64 can be provided.

  The superconducting coil 60 according to the third embodiment is manufactured through the above steps.

According to the above configuration,
The spacer member 61 and 62 provided between the end teak 3 (flange portion 1a) and the binding member 68 and between the end teak 4 (flange portion 1b) and the binding member 68 are connected to the superconducting wire 12 by the binding member 68. Are removed after being wound around the outer periphery of the outer space, and the space portions 63, 64 are provided between the end cheek 3 (flange portion 1a) and the binding member 68 and between the end cheek 4 (flange portion 1b) and the binding member 68. Can be provided. Thereby, when the superconducting coil 60 is in an excited state, even if the superconducting wire 12 is displaced, between the end cheek 3 (flange portion 1a) and the binding member 68 and the end cheek 4 (flange portion 1b). Since the space portions 63 and 64 are provided between the binding member 68 and the flange portion 1a and the binding member 68, the quenching phenomenon can be prevented.

(Modification)
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

(Modification 1)
For example, in the first embodiment, as shown in FIG. 4, the width 8 a of the entire binding member 8 is made shorter than the width 15 a of the superconducting wire 12 wound around the body 1, so that the binding member 8 and the flange portion 1 a. 1b or end cheeks 3 and 4 are prevented from coming into contact with each other. However, the present invention is not limited thereto, and the superconducting wire 12 is wound around the body 1 with a width 78a in the axial direction P of the outermost body of the binding member 78 as in the superconducting coil 70 according to the first modification shown in FIG. The trunk portion of the superconducting wire 12 wound around the trunk portion 1 with a width 78b of the trunk portion 1 axial direction P of the contact surface between the superconducting wire 12 and the binding member 78 shorter than the width 75a of the trunk portion 1 axial direction P It is the same as the width 75a in the uniaxial direction P (that is, the binding member 78 is tapered in a sectional view) so that the binding member 8 does not contact the flange portions 1a and 1b or the end cheeks 3 and 4. Good (Modification 1). FIG. 10 is a front sectional view of the superconducting coil 70 according to the first modification.

(Modification 2)
Further, for example, the present invention does not strongly restrain the superconducting wire 12 to the body portion 1 of the winding frame 2, and even if the superconducting wire 12 is displaced when the superconducting coil is in an excited state, the superconducting wire 12 This is based on the idea that the chance of the quenching phenomenon occurring is reduced by eliminating the portion (contact portion 12a) where the binding member provided on the outer periphery contacts the flange portion 1a. Then, as shown in FIGS. 11A and 11B, a cylindrical body 1 and a pair of flange parts 1a and 1b extending from the body 1 in the radially outward direction O are included. In the superconducting coil 80 including the winding frame 2, the superconducting wire 12 wound around the body 1, and the binding member 88 provided on the outer periphery of the superconducting wire 12, the winding strength of the superconducting wire 12 around the body 1 is increased. After the superconducting coil 80 is in an excited state, the superconducting wire 12 is loosened to the extent that the superconducting wire 12 is separated from the winding frame 2 by the hoop force, and the flange portions 1a and 1b are provided after the bind member 88 is provided on the outer periphery of the superconducting wire 12. It is good also as a structure which removed the part 1c * 1d adjacent to the bind member 88 (refer FIG. 11 (B): modification 2). FIG. 11 is a front sectional view of the superconducting coil 80 according to the second modification. 11A is a front cross-sectional view of the superconducting coil 80 before the portions 1c and 1d adjacent to the binding member 88 are removed, and FIG. 11B is the portion 1c and 1d adjacent to the binding member 88 removed. It is front sectional drawing of the superconducting coil 80 after a while.

  According to said structure, after providing the bind member 88 in the outer periphery of the superconducting wire 12, the part 1c * 1d adjacent to the bind member 88 of the flange parts 1a * 1b can be removed. As a result, in the superconducting coil 80 in the excited state, the hoop force that attempts to inflate the superconducting wire 12 in the radially outward direction O of the body portion 1 due to the interaction between the energized current and the magnetic field generated by itself is separated in the radially outward direction. Even if the superconducting wire 12 is displaced by the force F1, the binding member 88 and the flange portions 1a and 1b can be prevented from coming into contact with each other, and the quench phenomenon caused by the contact between the binding member 88 and the flange portions 1a and 1b can be prevented. Can be prevented.

(Modification 3)
Further, for example, as shown in FIGS. 12A and 12B, a cylindrical body 1 and a pair of flange parts 1a and 1b extending in the radially outward direction O from the body 1 are included. A winding frame 2, a superconducting wire 12 wound around the body 1, a binding member 98 provided on the outer periphery of the superconducting wire 12, an insulating sheet 5 interposed between the body 1 and the superconducting wire 12, In the superconducting coil 90 including the end cheeks 3a and 4a interposed between the flange portions 1a and 1b and the superconducting wire 12 and the binding member 98, the end after the binding member 98 is provided on the outer periphery of the superconducting wire 12 It is good also as a structure which remove | eliminated the part 3b * 4b adjacent to the binding member 98 of the cheeks 3a * 4a (refer FIG. 12 (B): modification 3). FIG. 12 is a front sectional view of the superconducting coil 90 according to the third modification. 12A is a front sectional view of the superconducting coil 90 before removing the portions 3b and 4b adjacent to the binding members 98 of the end cheeks 3a and 4a, and FIG. 12B is a plan view of the end cheeks 3a and 4a. 7 is a front cross-sectional view of superconducting coil 90 after removing portions 3b and 4b adjacent to binding member 98. FIG.

  With the above configuration, in the superconducting coil 90 in the excited state, the superconducting wire 12 in the radially outward direction of the hoop force that attempts to inflate the superconducting wire 12 in the radially outward direction O due to the interaction between the energized current and the magnetic field generated by itself. Even if the superconducting wire 12 is displaced by the component force F1, the binding member 98 and the flange portions 1a and 1b can be prevented from coming into contact with each other, and the quench caused by the contact between the binding member 98 and the flange portions 1a and 1b. The phenomenon can be prevented.

(Other variations)
In addition, the binding member is not limited to those described in the first to third embodiments, and for example, a thin strip-like insulating glass tape made of glass fiber may be used.

  In the first to third embodiments, the adhesive 31 is infiltrated into the superconducting wire 12 and cured. However, the present invention is not limited to this, and the superconducting wire 12 is vacuum-impregnated with the adhesive 31 or the filler. You may make it apply | coat an adhesive agent or a filler to the superconducting wire 12 directly, when winding the wire 12 around the trunk | drum 1. FIG.

DESCRIPTION OF SYMBOLS 1 Body part 1a * 1b Flange part 2 Winding frame 3 * 4 End cheek 5 Insulation sheet 8 Bind member 8a Width of axial direction P of outermost periphery of bind member 10 Superconducting coil 12 Superconducting wire 12a * 12b * 12c Contact location 15a Superconducting wire Width of axial direction P of 31 Adhesive F1 Component force in the radially outward direction of the hoop force P Axial direction O Radial outward direction

Claims (5)

A winding frame including a cylindrical body portion and a pair of flange portions extending radially outward from the body portion;
A superconducting wire wound around the body;
A binding member provided on the outer periphery of the superconducting wire,
The width of the outermost periphery of the binding member in the trunk portion axial direction is shorter than the width of the superconducting wire wound around the trunk portion in the trunk portion axial direction so that the binding member and the flange portion do not contact each other. A superconducting coil characterized by that. For the binding member, a material whose thermal contraction rate is larger than the thermal contraction rate of the superconducting wire,
When the superconducting coil is in an excited state, the width of the outermost periphery of the binding member in the axial direction of the trunk portion is shorter than the width of the superconducting wire wound around the trunk portion in the axial direction of the trunk portion. The superconducting coil according to claim 1, wherein the flange portion and the flange portion are not in contact with each other. The binding member is a wire wound around the outer periphery of the superconducting wire in a layered manner,
The superconducting coil according to claim 1 or 2, wherein the number of stacked layers is gradually reduced toward the outer side in the body axial direction of the winding frame. A spacer portion is provided between one or both of the paired flange portions and the binding member,
The superconducting coil according to claim 1, wherein a space portion is provided between one or both of the flange portions and the binding member by removing the spacer portion. A winding frame including a cylindrical body portion and a pair of flange portions extending radially outward from the body portion;
A superconducting wire wound around the body;
A binding member provided on the outer periphery of the superconducting wire,
The superconducting coil according to claim 1, wherein a space portion is provided between one or both of the flange portions and the binding member by removing a portion of the flange portion adjacent to the binding member.