JP6005428B2 - Superconducting coil and superconducting coil device - Google Patents

Description

  The present invention relates to a superconducting coil and a superconducting coil device, and more specifically, a winding portion formed by winding a thin film superconducting wire having a multilayer structure and a tape shape and an insulating material, and fixed to an end face of the winding portion. The present invention relates to a superconducting coil having an insulating layer and a superconducting coil device including the superconducting coil.

  As the superconducting wire constituting the winding part 101 of the superconducting coil 100 shown in FIG. 14, for example, a thin film superconducting wire having a multilayer structure in which a tape-shaped metal substrate, an intermediate layer, an RE-based oxide superconducting layer and a protective metal layer are laminated is used. Used.

  Incidentally, the winding portion 101 of the superconducting coil 100 is generally used in a state of being impregnated with resin. In this case, in a thin film superconducting wire having a multilayer structure, a tensile stress (peeling stress) acts in the laminating direction due to the thermal contraction difference between the resin and the thin film superconducting wire during cooling, resulting in stable delamination or cracking. There is a risk that the superconducting characteristics will not be obtained.

  Such peeling stress increases as the ratio of the inner diameter to the outer diameter (inner / outer diameter ratio) of the winding portion 101 in the superconducting coil 100 increases. Up to now, as a measure for reducing the peeling stress acting on the thin film superconducting wire, the winding portion 101 is provided with a portion having a weak adhesive force in a part of the winding portion 101 so that the winding portion 101 has a plurality of portions 101A having a small inner / outer diameter ratio. , 101B, 101C, 101D, and a technique for reducing the peeling stress acting on the thin film superconducting wire to an allowable stress or less is disclosed (see Patent Document 1).

JP 2010-267835 A

  However, when a withstand voltage of kV order is required, such as a superconducting magnetic energy storage device (SMES) or a current limiter, or when a plurality of superconducting coils 100 are stacked, a cooling heat transfer plate (not shown) is attached. In this case, the insulating layer 102 is required on both upper and lower end surfaces of the winding portion 101, and the winding portion 101 is physically constrained by the insulating layer 102 from both end surfaces. Therefore, even if a portion having a weak adhesive force is provided in a part of the turns of the winding portion 101 and the winding portion 101 is divided into a plurality of portions 101A, 101B, 101C, and 101D, the winding is restricted by the insulating layer 102. Since the plurality of portions 101A, 101B, 101C, and 101D of the wire portion 101 are integrated, there has been a problem that the peeling stress acting on the thin film superconducting wire cannot be reduced.

  The object of the present invention has been made in consideration of the above-described circumstances, and reduces the peeling stress acting on the thin film superconducting wire to prevent the superconducting coil from deteriorating in superconducting characteristics, and the axial end face of the superconducting coil. An object of the present invention is to provide a superconducting coil and a superconducting coil device that can secure insulation performance and can realize stable energization.

A superconducting coil according to the present invention includes a winding portion formed by winding a tape-shaped thin film superconducting wire together with an insulating material around a winding frame, and an insulating layer fixed to an axial end face of the winding portion. And the winding part is composed of a plurality of substantially concentric winding part elements separated in the radial direction, and the adhesive force of the boundary part between the adjacent winding part elements is The adhesive layer is set lower than the adhesive force in the winding element, and the insulating layer is fixed to substantially the entire end face of the winding part, and at least a boundary between the adjacent winding element in the radial direction When a slit or a recess is formed at a position corresponding to the portion, the width of the thin film superconducting wire is W1, and the axial thickness of the winding portion including the insulating layer is W2, the ratio W2 / W1 However, W2 / W1 ≦ 1. 5 is characterized in that it has been set to.

  The superconducting coil device according to the present invention is characterized in that a plurality of superconducting coils according to the present invention are stacked and each superconducting coil is electrically connected.

  According to the superconducting coil according to the present invention and the superconducting coil device provided with the superconducting coil, the peeling stress acting on the thin film superconducting wire is reduced to prevent the superconducting characteristics from deteriorating and the axial direction of the superconducting coil. The insulation performance of the end face can be secured, and stable energization can be realized by these.

The perspective view which shows 1st Embodiment of the superconducting coil which concerns on this invention. The top view which shows the superconducting coil of FIG. Sectional drawing which follows the III-III line | wire of FIG. FIG. 4 is a perspective view showing a multilayer structure of the superconducting tape wire of FIG. 3. The chart which shows the specifications of a superconducting coil about four cases which changed the axial direction thickness of a superconducting coil. The graph which shows the relationship between ratio W2 / W1 of axial direction thickness W2 of a superconducting coil with respect to width W1 of a superconducting tape wire, and a coil critical current value. The top view which shows 2nd Embodiment of the superconducting coil which concerns on this invention. The top view which shows 3rd Embodiment of the superconducting coil which concerns on this invention. The top view of the superconducting coil in the modification of 3rd Embodiment of FIG. The half sectional view corresponding to Drawing 3 showing a 4th embodiment of a superconducting coil concerning the present invention. The half sectional view corresponding to Drawing 3 showing a 5th embodiment of a superconducting coil concerning the present invention. (A) is a half cross-sectional view corresponding to FIG. 3 showing a sixth embodiment of the superconducting coil according to the present invention, and (B) is a perspective view showing the superconducting tape wire of FIG. The half sectional view corresponding to FIG. 3 which shows 7th Embodiment etc. of the superconducting coil which concerns on this invention. The half sectional view showing the conventional superconducting coil.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[A] First embodiment (FIGS. 1 to 6)
FIG. 1 is a perspective view showing a first embodiment of a superconducting coil according to the present invention. 2 is a plan view showing the superconducting coil of FIG. 1, and FIG. 3 is a cross-sectional view taken along the line III-III of FIG.

  The superconducting coil 10 shown in FIGS. 1 to 3 is a winding formed by winding a superconducting tape wire 11 as a thin film superconducting wire and an insulating tape wire 12 as an insulating material while winding them together on a winding frame 13. The portion 14 and the insulating layer 15 fixed to both end surfaces in the axial direction of the winding portion 14 are formed, for example, in a pancake shape.

  The superconducting tape wire 11 is formed in a tape shape with a multi-layer structure, and has at least a tape substrate 16, an intermediate layer 17, and a superconducting layer 18 as shown in FIG. Has been. In addition, the superconducting tape wire 11 is provided with an alignment layer 20 between the tape substrate 16 and the intermediate layer 17 and a protective layer 21 between the superconducting layer 18 and one stabilizing layer 19 as necessary. You can also.

  The tape substrate 16 is formed of a material such as a nickel alloy such as stainless steel or Hastelloy, a silver alloy, or the like. The intermediate layer 17 is a diffusion prevention layer and is made of a material such as cerium oxide, YSZ (yttria), magnesium oxide, yttrium oxide, ytterbium oxide, barium zirconia, and is formed on the tape substrate 16.

  The superconducting layer 18 is made of, for example, a superconducting thin film having a RE123-based composition (RE1B2C3O7 or the like). Note that “RE” in “RE1B2C3O7” is at least one of rare earth elements (for example, neodymium (Nd), gadolinium (Gd), holmium (Ho), samarium (Sm), etc.) and yttrium elements, and “B” is barium. (Ba), “C” means copper (Cu), and “O” means oxygen (O). The stabilization layer 19 is provided for the purpose of preventing the superconducting layer 18 from burning when excessive electricity flows through the superconducting layer 18, and is made of conductive silver or the like.

  The orientation layer 20 is provided for the purpose of orienting the intermediate layer 17 on the tape substrate 16 and is made of magnesium oxide (MgO) or the like. In the case where the tape substrate 16 is a substrate having an oriented layer, the orientation layer 20 can be omitted. The protective layer 21 is provided for the purpose of preventing the superconducting layer 18 from being deteriorated by contact with moisture in the air, and is made of silver or the like. This protective layer 21 also serves to prevent the superconducting layer 18 from burning when electricity flows excessively through the superconducting layer 18.

  The width (tape width) W1 of the tape-shaped superconducting tape wire 11 having such a multilayer structure is, for example, 4.0 mm, and the thickness T is, for example, 0.1 mm. The superconducting tape wire 11 is excellent in mechanical strength in the longitudinal direction, but is fragile to tensile stress (peeling stress) in a direction perpendicular to the longitudinal direction.

  1 and 3 is an insulating film such as polyimide, polyester, polyurethane, polyamide, polyamideimide, polyvinyl formal, polyvinyl butyral, or the like, or fiber reinforced plastic such as GFRP or CFRP, or thermosetting. It is formed of a glass cloth impregnated with a resin (epoxy resin, phenol resin, urea resin, melamine resin, etc.).

  The reel 13 is made of an insulating material such as glass fiber reinforced plastic or reinforced PTFE (polytetrafluoroethylene).

  The insulating layer 15 is used when a withstand voltage of kV order is required, such as a superconducting magnetic energy storage device (SMES) or a current limiter, or when a plurality of superconducting coils are stacked or a heat transfer plate for cooling is attached. The winding portion 14 is provided for insulation protection from the outside.

  Further, the insulating layer 15 is made of, for example, an insulating film such as polyimide, polyester, polyurethane, polyamide, polyamideimide, polyvinyl formal, polyvinyl butyral, or a thermosetting resin such as epoxy resin, phenol resin, urea resin, melamine resin, or the like. It is composed of a fiber reinforced plastic such as GFRP or CFRP, or a glass cloth impregnated with the thermosetting resin. Alternatively, these insulating layer forming materials may be laminated. For example, a glass cloth impregnated with a thermosetting resin is fixed to the end face of the winding part 14, and an insulating film (excluding polyvinyl formal and polyvinyl butyral) is adhered thereon with a thermosetting resin, or polyvinyl formal Alternatively, polyvinyl butyral may be directly fixed to the glass cloth.

  In the superconducting tape wire 11 configured as described above, an insulating resin (not shown) such as epoxy is used before the insulating layer 15 is fixed to both end faces of the winding portion 14, and the winding portion 14 (particularly, The superconducting tape wire 11 and the insulating tape wire 12) are integrally impregnated and cured. Thereby, the mechanical movement of the superconducting tape wire 11 during use of the superconducting coil 10 is suppressed, the coil strength is ensured, and the insulation protection between the turns of the winding portion 14 is achieved. As a result, it is possible to effectively prevent “quenching” in which the superconducting state of the superconducting coil 10 is broken.

  However, as shown in FIGS. 2 and 3, the winding portion 14 includes a plurality of substantially concentric winding portion elements 14 </ b> A, 14 </ b> B, 14 </ b> C, and 14 </ b> D that are divided in the radial direction. The adhesive force due to the above-described resin (for example, epoxy resin) at the boundary portion 23 between these adjacent winding portion elements 14A to 14D is the adhesion by the above-described resin (for example, epoxy resin) in each of the winding portion elements 14A to 14D. It is set lower than the force. In each winding element 14A to 14D, the ratio of the inner diameter to the outer diameter is set to a small value that can reduce the peeling stress acting on the superconducting tape wire 11 and prevent the superconducting characteristics of the superconducting coil 10 from deteriorating. .

  Since the winding portion 14 is divided into the winding portion elements 14A to 14D as described above, the superconducting coil 10 including the winding portion 14 impregnated with, for example, an epoxy resin is cooled from room temperature to liquid nitrogen temperature. Even if peeling stress occurs in the superconducting tape wire 11 due to the anisotropy of the linear expansion coefficient between individual members (particularly, the superconducting tape wire 11 and, for example, epoxy resin) inside the winding portion 14, this superconducting tape wire 11 is reduced to an allowable value that does not deteriorate the superconducting characteristics of the superconducting coil 10.

  By the way, according to the study by the present inventors, when the insulating layer 15 is fixed to both end faces of the winding part 14, the winding part 14 is physically constrained by the insulating layer 15 from both end faces. Therefore, even if the winding portion 14 is provided with a portion having a weak adhesive force (that is, the boundary portion 23) in a part of the turns and divided into the winding portion elements 14A to 14D, the winding portion 14 is restrained by the insulating layer 15. Since elements 14A-14D were integrated, it turned out that the peeling stress which acts on the superconducting tape wire 11 cannot be reduced.

  Therefore, in this embodiment, the width of the superconducting tape wire 11 is W1 (see FIG. 4), and the axial thickness of the winding portion 14 including the insulating layer 15 (that is, the axial thickness of the superconducting coil 10; FIG. 3). The ratio W2 / W1 is set so that W2 / W1 ≦ 1.15, where W2 is a reference). Thereby, the thickness of the insulating layer 15 is reduced, the restraint of the both end faces of the winding portion 14 by the insulating layer 15 is weakened, and the integration of the winding portion elements 14A to 14D is avoided.

  For example, FIG. 5 shows the specifications of four cases I to IV of the superconducting coil 10 in which the axial thickness W2 of the superconducting coil 10 is changed. When the coil critical current value, which is the superconducting characteristic of the superconducting coil 10 in each of the cases I to IV, was examined, the results shown in FIG. 6 were obtained.

  That is, when the ratio W2 / W1 of the axial thickness W2 of the superconducting coil 10 to the width W1 of the superconducting tape wire 11 exceeds 1.15, the coil critical current value is greatly reduced by the peeling stress acting on the superconducting tape wire 11. . On the other hand, when the ratio W2 / W1 is 1.15 or less, the coil critical current value does not decrease. Therefore, it was found that by setting the ratio W2 / W1 to 1.15 or less, the effect of reducing the peeling stress acting on the superconducting tape wire 11 can be obtained even if the insulating layer 15 is present.

Therefore, according to the first embodiment, the following effects are obtained.
In the superconducting coil 10, when the width of the superconducting tape wire 11 is W1, and the axial thickness of the winding part 14 including the insulating layer 15 (the axial thickness of the superconducting coil 10) is W2, the ratio W2 / Since W1 is set to W2 / W1 ≦ 1.15, the thickness of the insulating layer 15 can be reduced. Therefore, the restraint of the winding portion 14 by the insulating layer 15 can be weakened, and the integration of the winding portion elements 14A to 14D in the winding portion 14 can be avoided. As a result, the ratio of the inner diameter to the outer diameter of each winding part element 14A to 14D of the winding part 14 is appropriately maintained, thereby reducing the peeling stress acting on the superconducting tape wire 11 of each winding part element 14A to 14D. Thus, it is possible to prevent the deterioration of the superconducting characteristics of the superconducting coil 10. Furthermore, the insulation performance of the axial end face of the superconducting coil 10 can be ensured by fixing the insulating layer 15 to the axial end face of the winding portion 14. From these things, the superconducting coil 10 which can implement | achieve stable electricity supply can be provided.

[B] Second Embodiment (FIG. 7)
FIG. 7 is a plan view showing a second embodiment of the superconducting coil according to the present invention. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description is simplified or omitted.

  The superconducting coil 25 of the second embodiment is different from the first embodiment in that the insulating layer 26 is fixed to a part of each end face of the winding portion 14 (winding portion elements 14A to 14D). Is a point.

  The part to which the insulating layer 26 is fixed is a part requiring insulation protection, such as a part where a cooling heat transfer plate (not shown) is attached. Further, at the location where the insulating layer 26 is fixed, the axial thickness (the axial thickness of the superconducting coil 25) W2 of the winding portion 14 including the insulating layer 26 and the width W1 of the superconducting tape wire 11 The ratio W2 / W1 is set to W2 / W1 ≦ 1.15.

  As described above, in the superconducting coil 25 of the second embodiment, the fixing range of the insulating layer 26 is limited on both end faces of the winding portion 14, so that the winding portion 14 (winding portion element) by the insulating layer 26 is limited. 14A to 14D) are restrained to the minimum necessary. As a result, since the superconducting coil 25 can further reduce the peeling stress acting on the superconducting tape wire 11 as compared with the first embodiment, the superconducting characteristic can be further prevented from being lowered and more stable energization can be realized.

[C] Third embodiment (FIGS. 8 and 9)
FIG. 8 is a plan view showing a third embodiment of the superconducting coil according to the present invention. In the third embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is simplified or omitted.

  The superconducting coil 30 of the third embodiment is different from that of the first embodiment in that the insulating layer 31 is provided on substantially the entire end surfaces of the winding portion 14 (winding portion elements 14A to 14D). The insulating layer 31 is formed with slits 32 and 33 in at least part of the radial direction. The slit 32 is a concentric slit shown in FIG. 8, and the slit 33 is a vortex slit shown in FIG.

  Also in this embodiment, the axial thickness (that is, the axial thickness of the superconducting coil 30) W2 of the winding portion 14 including the insulating layer 31 in which the slit 32 or 33 is formed, and the width W1 of the superconducting tape wire 11 The ratio W2 / W1 is set to W2 / W1 ≦ 1.15.

  As described above, in the superconducting coil 30 of the third embodiment, the insulating layer 31 exists in the radial direction of the superconducting coil 30 on both end surfaces of the winding portion 14 by the slits 32 or 33 formed in the insulating layer 31. A portion not to be provided is provided. Here, the direction of the peeling stress acting on the superconducting tape wire 11 of the winding portion 14 is the radial direction of the superconducting coil 30. Accordingly, the slits 32 or 33 formed in the insulating layer 31 partially release both end surfaces of the winding portion 14 from the constraint of the insulating layer 31 in the radial direction of the superconducting coil 30. For this reason, in the superconducting coil 30 of this embodiment, the peeling stress which acts on the superconducting tape wire 11 can be reduced further than in the case of the first embodiment. As a result, the superconducting coil 30 can further prevent deterioration of the superconducting characteristics and can realize more stable energization.

[D] Fourth embodiment (FIG. 10)
FIG. 10 is a half sectional view corresponding to FIG. 3 showing a fourth embodiment of the superconducting coil according to the present invention. In the fourth embodiment, portions similar to those in the first embodiment are denoted by the same reference numerals, and description thereof is simplified or omitted.

  The superconducting coil 35 of the fourth embodiment is different from that of the first embodiment in that an insulating layer 36 is provided on each of both end faces of the winding portion 14 (winding portion elements 14A to 14D). A concentric or vortex shaped slit 37 is formed in at least a part of the radial direction in the insulating layer 36, and the slit 37 is formed between the adjacent winding portions 14A to 14D. This is a point formed corresponding to the boundary portion 23.

  In the case of the concentric circular shape, the slit 37 is positioned substantially coincident with the boundary portion 23 between the winding element elements 14A to 14D as shown in FIG. In the direction, it is positioned partially coincident with the boundary portion 23 between the winding element 14A to 14D.

  Also in this embodiment, the axial thickness of the winding portion 14 including the insulating layer 36 in which the slits 37 are formed (that is, the axial thickness of the superconducting coil 35) is W2, and the width of the superconducting tape wire 11 is. The ratio W2 / W1 with W1 is set to W2 / W1 ≦ 1.15.

  As described above, in the superconducting coil 35 of the fourth embodiment, the slit 37 formed in the insulating layer 36 corresponds to the boundary portion 23 between the adjacent winding portion elements 14A to 14D (the slit 37 is concentric). In the case of a shape, it is formed at a position substantially coinciding with the boundary portion 23, and in the case where the slit 37 is in a vortex shape, it is formed at a position partially coincident with the boundary portion 23 in the circumferential direction of the insulating layer 35. For this reason, since winding part element 14A-14D can be hold | maintained in the isolation | separation state also by presence of the insulating layer 36, the restriction | limiting of the insulating layer 36 with respect to the both end surfaces of the winding part 14 (winding part element 14A-14D) is eliminated, or Can be very weak. As a result, as compared with the case of the third embodiment, the peeling stress acting on the superconducting tape wire 11 of the winding portion 14 can be further reduced, so that the superconducting coil 35 is further prevented from deteriorating the superconducting characteristics, More stable energization can be realized.

[E] Fifth embodiment (FIG. 11)
FIG. 11 is a half sectional view corresponding to FIG. 3 showing a fifth embodiment of the superconducting coil according to the present invention. In the fifth embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description is simplified or omitted.

  The superconducting coil 40 in the fifth embodiment is different from the third and fourth embodiments in that the insulating layer 41 is formed on substantially the entire end faces of the winding portion 14 (winding portion elements 14A to 14D). Is that a concentric or vortex-shaped recess 42 is formed in at least a part of the radial direction. The recess 42 is preferably formed at a position corresponding to the boundary portion 23 between the adjacent winding element 14A to 14D.

  Also in the present embodiment, the axial thickness (that is, the axial thickness of the superconducting coil 40) W2 of the winding portion 14 including the insulating layer 41 (excluding the recess 42) and the superconducting tape wire 11 are also included. The ratio W2 / W1 to the width W1 is set to W2 / W1 ≦ 1.15.

  In the superconducting coil 40 of the fifth embodiment, the restraint of the end face of the winding portion 14 by the recess 42 formed in the insulating layer 41 is weaker than that of the other portions of the insulating layer 41, so that the third and fourth embodiments As in the case of the embodiment, the peeling stress acting on the superconducting tape wire 11 of the winding portion 14 can be reduced. For this reason, the superconducting coil 40 is prevented from deteriorating the superconducting characteristics and can realize more stable energization.

  Furthermore, in the superconducting coil 40 of the fifth embodiment, the integrity of the insulating layer 41 is ensured even by forming the recesses 42, so that the work of fixing the insulating layer 41 to the end face of the winding portion 14 can be facilitated.

[F] Sixth embodiment (FIG. 12)
12A is a half sectional view corresponding to FIG. 3 showing a sixth embodiment of the superconducting coil according to the present invention, and FIG. 12B is a perspective view showing the superconducting tape wire of FIG. 12A. . In the sixth embodiment, the same parts as those in the first and fourth embodiments are denoted by the same reference numerals, and the description will be simplified or omitted.

  The superconducting coil 45 of the sixth embodiment is different from the first and fourth embodiments in that the periphery of the superconducting tape wire 11 in the winding portion 14 (winding portion elements 14A to 14D) is covered with an insulating material 46. It is a point. At this time, the insulating tape wire 12 (FIG. 3) of the first embodiment may or may not be interposed between the superconducting tape wires 11 to which the insulating material 46 is applied.

  The insulating material 46 is coated by applying or adhering an adhesive insulating material such as polyvinyl formal or polyvinyl butyral, or a non-adhesive material made of an insulating material such as polyester, polyurethane, polyamide, polyamideimide, or polyimide. The insulating film is formed by performing so-called wrap winding, in which an overlapping portion is provided around the superconducting tape wire 11 and wound.

  Also in the present embodiment, similarly to the fourth embodiment, the axial thickness of the winding portion 14 including the insulating layer 36 in which the slit 37 is formed (that is, the axial thickness of the superconducting coil 45) W2 and The ratio W2 / W1 with the width W1 of the superconducting tape wire 11 is set to W2 / W1 ≦ 1.15.

  As described above, since the entire periphery of the winding part 14 in the superconducting tape wire 11 is directly insulated by the insulating material 46, the insulation performance of the superconducting coil 45 is improved. Therefore, the superconducting coil 45 can realize more stable energization due to the above-described effect of improving the insulation performance in addition to the effect of preventing the deterioration of the superconducting characteristics in the fourth embodiment.

[G] Seventh embodiment (FIG. 13)
FIG. 13 is a half sectional view corresponding to FIG. 3 showing a seventh embodiment of the superconducting coil according to the present invention. In the seventh embodiment, the same parts as those in the first and fourth embodiments are denoted by the same reference numerals, and the description will be simplified or omitted.

  The superconducting coil 50 of the seventh embodiment is different from the first and fourth embodiments in that it is for cooling as a cooling means on at least one surface of the insulating layer 36 fixed to both end faces of the winding portion 14. A point where the heat transfer plate 51 is fixed, a plurality of superconducting coils 50 are laminated in the axial direction so as to sandwich the cooling heat transfer plate 51, and the superconducting coils 50 are electrically connected to form a superconducting coil device 52. It is.

  Here, the cooling heat transfer plate 51 is made of a heat transfer material having a higher thermal conductivity than the winding portion 14 and the insulating layer 36, for example, a metal such as copper or aluminum. Also in the superconducting coil 50 of the seventh embodiment, the axial thickness of the winding portion 14 including the insulating layer 36 in which the slit 37 is formed (that is, the axial thickness of the superconducting coil 50) W2, and the superconducting tape. The ratio W2 / W1 with the width W1 of the line 11 is set to W2 / W1 ≦ 1.15.

  In the superconducting coil 50 configured as described above, the insulation with the heat transfer plate 51 for cooling is ensured by the insulating layer 36 while being cooled by the heat transfer plate 51 for cooling. In addition to the effect of preventing deterioration of the superconducting characteristics in the embodiment, more stable energization can be realized by improving the cooling performance described above.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the spirit of the invention, and components over different embodiments can be made. May be combined as appropriate.

  For example, each superconducting coil 10, 25, 30, 35, 40, 45 of the first to sixth embodiments is provided by interposing a cooling heat transfer plate 51 as in the seventh embodiment, or cooling heat transfer. The superconducting coil device may be configured by being laminated in the axial direction and electrically connected to each other without interposing the plate 51.

  Further, each of the superconducting coils 10, 25, 30, 35, 40, 45, 50 of the first to seventh embodiments is not limited to a pancake shape, and is not a race track shape, a saddle shape, an ellipse or the like. It may be configured in a circular shape.

  Furthermore, each winding part 14 in the superconducting coils 10, 25, 30, 35, 40, 45, 50 of the first to seventh embodiments has a small inner / outer diameter ratio, and the superconducting tape wire 11 of the winding part 14 has a peeling ability. When it is difficult to generate, it is not necessary to divide into a plurality of winding element.

10 Superconducting coil 11 Superconducting tape wire (thin film superconducting wire)
12 Insulating tape wire (insulating material)
13 Winding frame 14 Winding part 14A-14D Winding part element 15 Insulating layer 23 Boundary part 25, 30, 35, 40, 45, 50 Superconducting coil 26, 31, 36, 41 Insulating layer 32, 33, 37 Slit 42 Recessed part 46 Insulating material 51 Heat transfer plate 52 for cooling Superconducting coil device W1 Width W2 Axial thickness

Claims (6)

A superconducting coil having a winding part formed by winding a thin film superconducting wire having a multilayer structure and a tape shape together with an insulating material around a winding frame, and an insulating layer fixed to an axial end face of the winding part. And
The winding part is composed of a plurality of substantially concentric winding part elements separated in the radial direction, and an adhesive force at a boundary portion between the adjacent winding part elements is an adhesive force in the winding part element. Is set lower than
The insulating layer is fixed to substantially the entire end face of the winding portion, and a slit or a recess is formed at a position corresponding to a boundary portion between at least the adjacent winding portion elements in the radial direction,
When the width of the thin film superconducting wire is W1 and the axial thickness of the winding portion including the insulating layer is W2, the ratio W2 / W1 is set to W2 / W1 ≦ 1.15. A superconducting coil characterized by that. The superconducting coil according to claim 1 , wherein the slit or the recess has a concentric shape or a vortex shape. The superconducting coil according to claim 1 or 2 , wherein the thin film superconducting wire has an insulating coating around its periphery. The insulating layer comprises polyimide, polyester, polyurethane, polyamide, polyamideimide, polyvinyl formal, polyvinyl butyral, epoxy resin, phenol resin, urea resin, melamine resin, GFRP, CFRP, glass cloth impregnated with thermosetting resin, The superconducting coil according to any one of claims 1 to 3 , wherein the superconducting coil is made of at least one selected from the group consisting of: Said cooling means on the surface of the insulating layer is provided, the cooling means, according to claim 1 to 4, characterized in that it is configured thermal conductivity than the winding portion and the insulating layer is at a high heat transfer material The superconducting coil according to any one of the above. A superconducting coil device comprising a plurality of superconducting coils according to any one of claims 1 to 5 , wherein the superconducting coils are electrically connected to each other.

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