JP5310914B1 - Superconducting equipment - Google Patents

Abstract

A superconducting coil body and a superconducting device including a magnetic circuit member capable of reducing loss are provided.
In a superconducting device including a superconducting coil body, the superconducting coil body is composed of a coil main body around which a superconducting wire is wound, and a coil main body located on an end surface side intersecting with a main surface of the superconducting wire. The angle formed by the central axis of the superconducting coil body 10 and the main surface of the superconducting wire 15 is 10 ° or more, including a magnetic circuit member made of a magnetic material disposed so as to face the surface.
[Selection] Figure 3

Description

  The present invention relates to a superconducting device, and more particularly to a superconducting device including a magnetic circuit member constituting a magnetic circuit.

  2. Description of the Related Art Conventionally, a superconducting coil configured by winding a superconducting wire is known (see, for example, Japanese Patent Application Laid-Open No. 2011-091094 (Patent Document 1)). In a superconducting coil, when a magnetic field is generated by passing an electric current, if magnetic flux lines of the magnetic field penetrate the main surface of the superconducting wire, there is a problem that the electrical characteristics of the superconducting coil deteriorate. More specific description will be given below.

  When an AC magnetic field is generated by passing an AC current through the superconducting coil, so-called AC loss such as hysteresis loss, coupling loss, and eddy current loss occurs. The magnitude of this AC loss is determined by the magnitude of the magnetic flux density in the magnetic field, but at the same time, the magnitude of the loss (AC loss) varies depending on the direction of the magnetic flux line with respect to the superconducting coil (specifically, the main surface of the superconducting wire). . For example, in a region where the magnetic flux density is large to some extent, the magnetic flux in the direction perpendicular to the main surface of the superconducting wire constituting the superconducting coil generates a loss that is 10 times or more larger than the magnetic flux parallel to the main surface. There is. Here, the main surface of the superconducting wire means a surface having a relatively large surface area among the surfaces constituting the side surface of the superconducting wire when the superconducting wire is a tape-like wire.

  In the above-mentioned Japanese Patent Application Laid-Open No. 2011-091094, the main surface of the superconducting wire constituting the superconducting coil is inclined with respect to the central axis of the winding of the superconducting wire so as to be along the direction in which the magnetic flux lines expected to be generated extend. It has been proposed to reduce the proportion of magnetic flux lines penetrating the main surface of the superconducting wire.

JP 2011-091094 A

  However, regarding the superconducting coil provided with the magnetic circuit member examined by the inventors, the influence of the inclination angle that inclines the main surface of the superconducting wire with respect to the central axis of the winding of the superconducting material is described in JP-A-2011-2011. No disclosure or suggestion is made in Japanese Patent No. 091094. In a superconducting coil provided with a magnetic circuit member, the distribution of magnetic flux lines is affected by the presence of the magnetic circuit member, and therefore, a new examination is necessary regarding the preferable range for reducing the loss and the influence of the above-described inclination angle. .

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a superconducting coil body and a superconducting device provided with a magnetic circuit member capable of reducing loss. That is.

The superconducting device according to the present invention is a superconducting device comprising a superconducting coil body, wherein the superconducting coil body is a coil body portion wound with a superconducting wire, and a coil body portion located on the end surface side intersecting the main surface of the superconducting wire. The first angle formed by the central axis of the superconducting coil body and the main surface of the superconducting wire is 10 ° or more. The superconducting coil body is disposed so as to surround the outer periphery of the coil main body, and further includes an outer peripheral coil main body around which the superconducting wire is wound. The outer peripheral side coil main body has a surface located on the end face side intersecting with the main surface of the superconducting wire. A magnetic circuit member contains the outer peripheral side opposing surface which opposes the surface in an outer peripheral side coil main-body part. The second angle formed by the central axis of the superconducting coil body and the main surface of the superconducting wire of the outer coil body is 10 ° or more.

  In this case, the coil body portion and the magnetic circuit member constitute a part of the magnetic circuit, and the side surface of the magnetic circuit member has a flat portion closer to the coil body portion. In the region facing the facing surface of the circuit member, the direction of the magnetic flux lines extending from the magnetic circuit member to the coil body can be efficiently defined in a direction along the main surface of the superconducting wire of the coil body. That is, by arranging a magnetic circuit member made of a magnetic material on the end face side intersecting with the main surface of the superconducting wire of the coil main body, the magnetic flux can go around the center of the current flowing through the coil main body. The coil body and the magnetic circuit member are arranged so as to be able to do so. As a result, the direction of the magnetic flux generated by the current flowing in the coil main body can be induced in the direction along the main surface of the superconducting wire as described above. For this reason, the ratio of the magnetic flux line extended so that the main surface of a superconducting wire may be penetrated in a coil main-body part can be reduced effectively. Therefore, generation | occurrence | production of the loss in a superconducting coil resulting from presence of the magnetic flux line which penetrates the main surface of a superconducting wire can be suppressed.

  Furthermore, by setting the angle to 10 ° or more, the occurrence of AC loss in the superconducting coil body can be effectively suppressed, and the critical current value can be improved. Here, the reason why the angle is set to 10 ° or more is that the effect of reducing the AC loss in the superconducting coil body according to the present invention becomes more prominent in the range where the angle is set to 10 ° or more.

  According to the present invention, in the superconducting device, the main surface of the superconducting wire constituting the superconducting coil body is inclined with respect to the central axis of the winding of the superconducting wire, thereby effectively suppressing the occurrence of AC loss.

It is a cross-sectional schematic diagram which shows Embodiment 1 of the superconducting apparatus by invention. It is a cross-sectional schematic diagram which shows the cooling container in which the superconducting coil body which comprises the superconducting apparatus shown in FIG. 1 was stored. FIG. 3 is a partial cross-sectional schematic diagram of the superconducting coil body shown in FIG. 2. FIG. 4 is a partial enlarged cross-sectional schematic view of the superconducting coil body shown in FIG. 3. It is a partial cross section schematic diagram of the superconducting coil body which comprises Embodiment 2 of the superconducting apparatus by this invention. FIG. 5 is a partial cross-sectional schematic diagram of the superconducting coil body shown in FIG. 4. It is a characteristic view for demonstrating Example 1 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
Referring to FIGS. 1 and 2, superconducting device 100 according to the present embodiment includes a rotor that is a rotor and a stator that is a stator disposed around the rotor. The rotor includes a rotation shaft 118 extending in a major axis direction perpendicular to the paper surface of FIG. 1, a rotor shaft 116 connected to the rotation shaft 118 and disposed around the rotation shaft 118, and an outer surface of the rotor shaft 116. And four permanent magnets 120 arranged at equal intervals. The outer surface of the rotor shaft 116 has an arc shape in cross section. The permanent magnets 120 arranged at equal intervals in the circumferential direction of the outer surface of the rotor shaft 116 have a quadrangular cross-sectional shape. The permanent magnet 120 is arranged so as to extend along the extending direction of the rotating shaft 118 in a direction perpendicular to the paper surface of FIG. As the permanent magnet 120, for example, a neodymium magnet, a samarium magnet, a ferrite magnet, or the like can be used.

  Around the rotor, a stator is disposed as a stator of the superconducting device 100 as shown in FIG. The stator includes a stator yoke 121, a stator core 123 formed so as to protrude from the inner peripheral side of the stator yoke 121 toward the rotor, a superconducting coil body 10 disposed so as to surround the outer periphery of the stator core 123, And a cooling container 107 that holds the superconducting coil body therein. In the superconducting device according to the present embodiment, the stator cores 123 are arranged at six equal intervals, and the superconducting coil body 10 is provided so as to surround each stator core 123. That is, six superconducting coil bodies 10 are arranged at equal intervals as a three-phase six-slot stator.

  The stator yoke 121 is disposed so as to surround the outer periphery of the rotor shaft 116. The inner surface of the stator yoke 121 has an arcuate cross-sectional shape (a cross-sectional shape in a plane perpendicular to the extending direction of the rotating shaft 118). Superconducting coil body 10 is arranged along the arcuate inner surface of stator yoke 121. The cooling container 107 has an opening in a region located at the center of the superconducting coil body 10 so that a part of the stator core 123 can be inserted. That is, the superconducting coil body 10 is disposed so as to surround the outer periphery of the stator core 123.

  The cooling container 107 includes a cooling container inner tank 105 that holds the refrigerant 117 and the superconducting coil body 10 therein, and a cooling container outer tank 106 that is disposed so as to surround the outer periphery of the cooling container inner tank 105. A gap is provided between the cooling vessel outer tub 106 and the cooling vessel inner tub 105, and the inside of the gap is substantially in a vacuum state. That is, the cooling container 107 is a heat insulating container.

  As shown in FIGS. 1 to 3, the superconducting coil body 10 is disposed so as to surround the inner peripheral coil bodies 12 a and 12 b surrounding the inner periphery of the stator core 123 and the outer peripheral side of the inner peripheral coil bodies 12 a and 12 b. The first magnetic body 13 arranged to connect the outer peripheral coil bodies 11a, 11b, the upper end face of the inner peripheral coil body 12a, and the upper end face of the outer peripheral coil body 11a, and the lower end face of the inner peripheral coil body 12b And a second magnetic body 14 arranged to connect the lower end surface of the outer peripheral coil body 11b. The inner peripheral coil bodies 12a and 12b and the outer peripheral coil bodies 11a and 11b are formed by winding a tape-shaped superconducting wire 15. By arranging the inner coil bodies 12a and 12b, the outer coil bodies 11a and 11b, the first magnetic body 13 and the second magnetic body 14 in this way, the magnetic flux generated by the current flowing through the superconducting wire 15 is changed to the first magnetic body. The body 13 and the second magnetic body 14 can be extended in a direction parallel to the main surface of the superconducting wire 15. As a result, the magnetic flux can be prevented from penetrating the main surface of the superconducting wire 15. The inner peripheral coil bodies 12a and 12b and the outer peripheral coil bodies 11a and 11b are formed so as to surround the central axis 16 shown in FIG. That is, the central axis 16 is a central axis for winding the superconducting wire 15.

  The inner peripheral coil bodies 12a and 12b are laminated so that the end surfaces of the superconducting wire 15 (end surfaces connected to the main surface) face each other. Further, the outer peripheral coil bodies 11a and 11b are also laminated so that the end surfaces (end surfaces continuous with the main surface) of the superconducting wire 15 are opposed to each other. In addition, although the structure where two coils called the inner periphery coil bodies 12a and 12b are laminated | stacked is shown here, only one inner circumference coil body is arrange | positioned, or three or more inner circumference coil bodies are laminated and arranged. You may do it. In addition, only one outer coil body may be arranged for the outer coil bodies 11a and 11b, or three or more outer coil bodies may be laminated.

  The main surfaces of the superconducting wire 15 in the inner coil bodies 12a and 12b and the outer coil bodies 11a and 11b are formed so as to be inclined at an angle of 10 ° or more with respect to the central axis 16. . That is, the angle (angle θ in FIG. 3) formed by the central axis 16 and the main surface of the superconducting wire 15 is 10 ° or more. The angle θ is preferably 30 ° or more, and more preferably the angle θ is 30 ° or more and 45 ° or less. From another point of view, the longitudinal axis 131 of the superconducting coil body 10 in the cross section shown in FIG. 2 is formed so as to be inclined at the angle θ with respect to the central axis 130 of the stator core.

  At this time, a part of the magnetic flux lines resulting from the current flowing through the superconducting wire 15 passes through the stator yoke 121 by turning around the superconducting wire 15 and relatively outside the normal superconducting coil body 10. However, some of the magnetic flux lines become leakage magnetic flux, go relatively inside the magnetic flux lines, enter the inside of the cooling vessel inner tank 105 and penetrate the inside of the superconducting wire 15. Leakage magnetic flux penetrating through the superconducting wire 15 may cause AC loss, degrade the current characteristics of the superconducting coil body 10, and reduce the electrical efficiency of the superconducting device.

  In contrast, by inclining the main surface of the superconducting wire 15 with respect to the central axis 16 at the angle θ described above, the leakage magnetic flux leaking from the side surface of the stator core 123 to the superconducting coil body 10 side is reduced to the magnetic circuit member ( For example, the magnetic material is attracted to the second magnetic body 14) and circulates around the superconducting wire 15, or leakage magnetic flux is caused between the end of the tip 124 of the stator core 123 and the end of the tip of the other adjacent stator core. It can guide so that it may flow toward an opening part. As a result, leakage magnetic flux can be prevented from penetrating the main surface of superconducting wire 15.

  Here, specifically, when the angle θ is less than 10 °, a part of the leakage magnetic flux leaking from the side surface of the stator core 123 to the superconducting coil body 10 side is particularly superconducting wire rod of the superconducting coil body 10. AC loss occurs. Further, a part of the leakage magnetic flux is attracted to the second magnetic body 14 to change its extending direction, and as a result, reaches another superconducting coil body 10 provided adjacent to the same cooling vessel inner tank. There is a case. On the other hand, if the angle is 10 ° or more, the leakage magnetic flux that has entered the cooling vessel inner tank passes through the second magnetic body 14 and is on the tip end 124 side of the stator core 123 (for example, the end of the tip end of another adjacent stator core). And the leakage magnetic flux can be prevented from penetrating through the superconducting wire 15. In particular, at an angle θ of 30 ° or more and 45 ° or less, it is possible to more effectively prevent leakage magnetic flux from penetrating the main surface of the superconducting wire 15 and reduce AC loss. In an actual superconducting device, it is not preferable to form the superconducting coil body 10 with the angle θ (inclination angle) of 45 ° or more due to structural limitations because the superconducting device is increased in size. That is, the angle θ is preferably 45 ° or less.

  In the example of FIG. 1, the main surfaces of the superconducting wires 15 of the inner peripheral coil bodies 12a and 12b and the outer peripheral coil bodies 11a and 11b are parallel to each other. Thereby, the magnetic flux density vector by the electric current which flows through each superconducting wire 15 can cancel each other, and the magnetic flux which penetrates the main surface of superconducting wire 15 can be reduced. On the other hand, the main surface of the superconducting wire 15 may not be parallel between the inner coil bodies 12a and 12b and the outer coil bodies 11a and 11b as long as the influence of leakage magnetic flux on the superconducting wire is allowed. In this case, the main surface of the superconducting wire 15 of the inner peripheral coil bodies 12a and 12b and the main surface of the superconducting wire 15 of the outer peripheral coil bodies 11a and 11b are within the above ranges with respect to the central axis of the superconducting coil body 10, respectively. It is preferable to take an inclination angle of.

  As shown in FIGS. 2 and 3, the first magnetic body 13 and the second magnetic body 14 may have a cross-sectional shape bent like a fan shape. Further, when the superconducting coil body 10 is viewed in plan (when the superconducting coil body 10 is viewed from the direction along the central axis 16), the first magnetic body 13 and the second magnetic body 14 surround the periphery of the stator core 123. It may be a shape (annular shape). Further, as shown in FIG. 4, the outer peripheral coil body 11b and the second magnetic body 14 can be connected and fixed by a bonding agent 29 such as an adhesive. Such a bonding agent 29 can also be used for connecting and fixing the outer coil body 11 a and the inner coil bodies 12 a and 12 b to the second magnetic body 14 and the first magnetic body 13. Any material can be adopted as the material constituting the first magnetic body 13 and the second magnetic body 14 as long as they are magnetic bodies, and different magnetic bodies may be employed.

  As shown in FIGS. 2 and 3, in the superconducting coil body 10 constituting the superconducting device 100 according to the present invention, inner coil bodies 12a and 12b, outer coil bodies 11a and 11b, a first magnetic body 13 and a second magnetic body. The body 14 constitutes a magnetic circuit. Further, as shown in FIG. 4, in the second magnetic body 14, the end portion of the end surface facing the outer coil body 11 b protrudes outward from the surface facing the second magnetic body 14 in the outer coil body 11 b. And the convex part 19 containing the edge part which protruded in this way opposes the inner periphery coil bodies 12a and 12b and the outer periphery coil bodies 11a and 11b in the 1st magnetic body 13 and the 2nd magnetic body 14, as shown in FIG. It is formed in each area to be.

  For this reason, especially in the boundary part of inner peripheral coil body 12a, 12b and outer peripheral coil body 11a, 11b, the 1st magnetic body 13, and the 2nd magnetic body 14, the surrounding magnetic flux line is changed from the convex part 19 to the 1st magnetic body 13. And it can be pulled into the second magnetic body 14. That is, generation of magnetic flux lines that penetrate the main surfaces 15a and 15b of the superconducting wire 15 at the boundary portion can be suppressed. For this reason, the loss in the superconducting coil body 10 is increased due to the generation of magnetic flux lines so as to penetrate the main surfaces 15a and 15b of the superconducting wire 15, and as a result, the performance of the superconducting coil body 10 deteriorates. The occurrence of such problems can be suppressed.

  As shown in FIGS. 2 and 3, in the first magnetic body 13 and the second magnetic body 14, a side surface 14a (continuous to the end surface facing either one of the inner peripheral coil bodies 12a and 12b and the outer peripheral coil bodies 11a and 11b) A surface portion 37 inclined with respect to the extending direction of the main surfaces 15a and 15b of the superconducting wire 15 is formed at the end of the superconducting wire 15 (see FIG. 4). The surface portion 37 may be a flat surface or may have a curved shape as shown in FIG.

(Embodiment 2)
A second embodiment of the superconducting device according to the present invention will be described with reference to FIGS. The superconducting device according to the second embodiment basically has the same structure as the superconducting device shown in FIGS. 1 to 4 and can obtain the same effect, but only the structure of the superconducting coil body is different. Yes.

  Specifically, the intermediate magnetic circuit member 42 is disposed between the inner peripheral coil bodies 12 a and 12 b constituting the superconducting coil body 10. The planar shape of the intermediate magnetic circuit member 42 is annular like the inner peripheral coil bodies 12a and 12b, and the width (the width in the left-right direction in FIG. 6) is any thickness of the inner peripheral coil bodies 12a and 12b. It is bigger than that. Any material can be adopted as the material constituting the intermediate magnetic circuit member 42 as long as it is a magnetic body, but it is preferable to use the same material as that constituting the first magnetic body 13 or the second magnetic body 14. .

  The inner peripheral coil body 12a and the inner peripheral coil body 12b may have different thicknesses in the radial direction viewed from the central axis of the coil. Specifically, the thickness of the inner peripheral coil body 12b may be smaller than the thickness of the inner peripheral coil body 12a. A step portion is formed at the connection portion between the inner peripheral coil bodies 12a and 12b.

  At this time, since the number of turns of the superconducting wire 15 is different between the inner peripheral coil bodies 12a and 12b, the magnetic flux density vector caused by the current flowing through the inner peripheral coil bodies 12a and 12b is not canceled out. The proportion of magnetic flux lines passing through the surface increases. As a result, a large loss occurs in the stepped portion.

  Therefore, in the present embodiment, by arranging the intermediate magnetic circuit member 42 between the inner peripheral coil bodies 12a and 12b, the current flowing in one of the inner peripheral coil body 12a and the inner peripheral coil body 12b. It is possible to prevent the direction of the magnetic flux lines resulting from the above from directly affecting the other inner coil body. For this reason, even if the inner peripheral coil bodies 12a and 12b having different numbers of turns are stacked, the ratio of the magnetic flux lines passing through the main surface of the superconducting wire 15 constituting the inner peripheral coil bodies 12a and 12b increases. Can be suppressed.

  Further, the thickness of the inner peripheral coil body 12b disposed at a position closer to the central axis 130 of the stator core is made smaller than the thickness of the inner peripheral coil body 12a disposed relatively far from the central axis 130. Thus, the inner peripheral coil body 12b can be arranged at a position as far as possible from the center axis 130 of the stator core. For this reason, the possibility that the leakage magnetic flux penetrates the main surface of the inner peripheral coil body 12b can be reduced.

  In the example shown in FIGS. 5 and 6, the superconducting coil body 10 has an intermediate magnetic circuit member 41 between the outer coil body 11a and the outer coil body 11b. The planar shape of the intermediate magnetic circuit member 41 is annular like the outer coil bodies 11a and 11b, and the width (the width in the left-right direction in FIG. 6) is greater than the thickness of any of the outer coil bodies 11a and 11b. It is getting bigger. Any material can be adopted as the material constituting the intermediate magnetic circuit member 41 as long as it is a magnetic material. However, similarly to the intermediate magnetic circuit member 42, the first magnetic material 13 or the second magnetic material 14 is constituted. It is preferable to use the same material as the material.

  Further, by providing the intermediate magnetic circuit member 41 between the outer peripheral coil bodies 11a and 11b, the outer peripheral coil body 11a and the outer peripheral coil body 11a are arranged in the same manner as when the intermediate magnetic circuit member 42 is disposed between the inner peripheral coil bodies 12a and 12b. The direct influence which the direction of the magnetic flux line resulting from the electric current which flows into one of the coil bodies 11b has on the other inner periphery coil body can be reduced effectively. That is, even if the thickness of the outer coil body 11b is smaller than the thickness of the outer coil body 11a, the ratio of the magnetic flux lines passing through the main surface of the superconducting wire 15 constituting the outer coil bodies 11a and 11b is increased. Can be suppressed.

  The superconducting device 100 of the present invention including the superconducting coil body 10 shown in FIGS. 5 and 6 has a superconducting wire having an angle θ (inclination angle) of 10 ° or more with respect to the central axis 16 of the superconducting coil body 10. Since 15 is wound, the loss in the superconducting coil body 10 is suppressed as in the superconducting equipment shown in FIGS.

  Hereinafter, although there is a portion overlapping with the above-described embodiment, characteristic configurations of the present invention will be listed.

  A superconducting device according to the present invention is a superconducting device including a superconducting coil body 10, and the superconducting coil body 10 is an end face side intersecting with a coil main body wound with a superconducting wire 15 and a main surface of the superconducting wire 15. And a magnetic circuit member (first magnetic body 13 and second magnetic body 14) made of a magnetic material and disposed so as to face the surface of the coil main body portion located at the center of the superconducting coil body 10 and the superconductivity The angle θ formed by the main surface of the wire 15 is 10 ° or more.

  In this case, the coil body and the magnetic circuit members (the first magnetic body 13 and the second magnetic body 14) constitute a part of the magnetic circuit. Further, as shown in FIG. 5 and the like, since the side surfaces of the magnetic circuit members (the first magnetic body 13 and the second magnetic body 14) have a flat portion near the coil main body, the surface of the coil main body and the magnetic circuit In the region facing the opposing surface of the member, the direction of the magnetic flux lines extending from the magnetic circuit member (the first magnetic body 13 and the second magnetic body 14) to the coil main body is set to the main surface of the superconducting wire 15 of the coil main body. It is possible to define efficiently in the direction along. That is, by arranging the magnetic circuit members (the first magnetic body 13 and the second magnetic body 14) made of a magnetic material on the end face side intersecting with the main surface of the superconducting wire 15 of the coil main body portion, the coil main body portion flows. The coil body and the magnetic circuit members (the first magnetic body 13 and the second magnetic body 14) are arranged so that the magnetic flux can go around the current center. As a result, the direction of the magnetic flux generated by the current flowing through the coil body can be guided in the direction along the main surface of the superconducting wire 15 as described above. For this reason, the ratio of the magnetic flux lines extending so as to penetrate the main surface of the superconducting wire 15 in the coil main body can be effectively reduced. Therefore, it is possible to suppress the occurrence of loss in the superconducting coil due to the presence of magnetic flux lines penetrating the main surface of the superconducting wire 15.

  Furthermore, by setting the angle θ to 10 ° or more, the generation of AC loss in the superconducting coil body can be effectively suppressed, and the critical current value can be improved.

  The angle θ formed by the central axis of the superconducting coil body and the main surface of the superconducting wire 15 is preferably 30 ° or more, and more preferably 45 ° or less. Here, the preferable range of the angle θ is set to 30 ° or more. If the angle θ is 30 ° or more, the critical current value becomes sufficiently large and the effect of reducing the AC loss can be obtained more reliably. This is because it can. In addition, the upper limit of the angle θ is set to 45 °. If the angle θ exceeds 45 °, the work of winding the superconducting wire 15 constituting the superconducting coil body becomes difficult and the size of the superconducting coil body is reduced. This is because (occupied area) becomes too large, and the problem that the degree of freedom in designing the superconducting device becomes small becomes significant.

  The coil main body includes a first coil (inner coil body 12a) wound with the superconducting wire 15 and a second coil (inner coil body) laminated on the first coil and wound with the superconducting wire 15. 12b). Superconducting coil body 10 may further include an intermediate magnetic circuit member 42 disposed between the first coil and the second coil. The intermediate magnetic circuit member 42 may be made of a magnetic material.

  In this case, even if the number of turns is different between the first coil (inner peripheral coil body 12a) and the second coil (inner peripheral coil body 12b), the first coil and the second coil It is possible to prevent the direction of the magnetic flux lines caused by the current flowing in one of the coils from directly affecting the other coil.

  The superconducting coil body may be disposed so as to surround the outer periphery of the coil main body, and may further include an outer coil body (outer coil bodies 11a and 11b) around which the superconducting wire 15 is wound. The outer peripheral coil body may have a surface located on the end face side that intersects the main surface of the superconducting wire 15. The magnetic circuit members (the first magnetic body 13 and the second magnetic body 14) may include an outer peripheral facing surface that faces the surface of the outer peripheral coil body. The angle θ formed by the central axis of the superconducting coil body and the main surface of the superconducting wire 15 of the outer coil body may be 10 ° or more.

  In this case, the coil main body (inner peripheral coil bodies 12a and 12b) and the outer peripheral coil main body (outer coil bodies 11a and 11b) are arranged concentrically around the central axis 16, and these coil main bodies and Since the magnetic circuit member (first magnetic body 13) is arranged so as to connect to the outer peripheral side coil main body portion, these coil main body portions (inner peripheral coil bodies 12a and 12b) and magnetic circuit member (first magnetic body 13) are arranged. ), The outer coil body (outer coil bodies 11a and 11b), and another magnetic circuit member (second magnetic body 14) shown in FIG. 6 can form a magnetic circuit. As a result, it is possible to more reliably suppress the generation of magnetic flux lines that penetrate the main surface of the superconducting wire 15 that constitutes the coil main body portion and the outer coil body portion. Can be suppressed.

  Furthermore, by setting the angle θ formed by the central axis 16 of the superconducting coil body and the main surface of the superconducting wire 15 of the outer coil body (outer coil bodies 11a and 11b) to be 10 ° or more, the outer coil body The occurrence of AC loss in the portion can be effectively suppressed, and the critical current value can be improved. Here, the reason why the angle θ is set to 10 ° or more is that the effect of reducing the AC loss in the superconducting coil body according to the present invention becomes more prominent in the range where the angle θ is set to 10 ° or more.

  The angle θ formed by the central axis of the superconducting coil body and the main surface of the superconducting wire 15 of the outer coil body (outer coil bodies 11a and 11b) is preferably 30 ° or more, more preferably 45 ° or less. is there. Here, the preferable range of the angle θ is set to 30 ° or more. If the angle θ is 30 ° or more, the critical current value in the outer coil body becomes sufficiently large, and at the same time, the AC loss reduction effect is achieved. It is because it can obtain more reliably. The upper limit of the angle θ is set to 45 °. If the angle θ exceeds 45 °, the operation of winding the superconducting wire 15 constituting the outer coil body is difficult and the superconducting coil body. This is because the size (occupied area) becomes too large, and the problem that the degree of freedom of design of the superconducting device becomes small becomes remarkable.

  In order to confirm the effect of the present invention, the following simulation was performed. Specifically, in the superconducting device according to Embodiment 1, the relationship between the inclination angle of the main surface of the superconducting wire 15 and the AC loss with respect to the central axis 130 of the stator core 123 was evaluated by simulation.

(Target of evaluation)
The superconducting device of the first embodiment shown in FIG. 1 is employed. Specifically, the number of turns (the number of turns) of the inner peripheral coil bodies 12a and 12b and the outer peripheral coil bodies 11a and 11b are all 14, and the size of the superconducting wire 15 constituting these coil bodies is a width: 4.65 mm, Thickness: 0.31 mm, and electrical resistance per coil full length was 1 × 10 ⁻⁵ Ω. Further, the width of the opening (slot opening width) formed between the front end portions 124 of the adjacent stator cores 123 shown in FIG.

  Further, as the sizes of the first magnetic body 13 and the second magnetic body 14, the width of the surface facing the outer peripheral coil bodies 11a and 11b and the inner peripheral coil bodies 12a and 12b shown in FIG. 3 is 6.34 mm, and For the magnetic characteristics of the first magnetic body 13 and the second magnetic body 14, a physical property library of electrical steel sheets mounted on the software used for the simulation was used.

(Examination method)
For the above-described example, the AC loss and the critical current value were obtained by simulation while appropriately changing the inclination angle of the main surface of the superconducting wire with respect to the central axis of the stator core. As the simulation conditions, a current value per wire rod of 159 A (crest value), a motor rotation speed of 735 rpm, and the like were used. The software used in the simulation is JMAG.

(result)
Referring to FIG. 7, as a result of the simulation as described above, an increase in the critical current value Ic was recognized at the same time as the AC loss was reduced when the inclination angle was 10 ° or more. 7 represents the coil angle (angle θ shown in FIG. 3 or tilt angle: unit is deg.), The left vertical axis is AC loss (unit: W), and the right vertical axis is the critical current. The value Ic (unit: A) is indicated.

  Referring to FIG. 7, the critical current value tends to increase up to an inclination angle of 30 °, and there is a significant correlation between the critical current value and the inclination angle in the range of the inclination angle from 30 ° to 50 °. I couldn't see it. On the other hand, the AC loss showed a remarkable decreasing tendency as the inclination angle was increased from 10 ° to 40 °. On the other hand, the tendency of decreasing AC loss at an inclination angle of 40 ° or more is not so remarkable as compared with the range of an inclination angle of 10 ° or more and 40 ° or less. In an actual superconducting device, it is not preferable to form a superconducting coil body at an inclination angle of 45 ° or more due to structural limitations.

  That is, the main surface of the superconducting wire has an inclination angle of 10 ° or more, preferably 30 ° or more and 45 ° or less with respect to the central axis of the stator core (that is, the central axis of the superconducting coil body 10). It was shown that the critical current value can be increased.

  From Example 1, it was found that by reducing the inclination angle of the main surface of the superconducting wire constituting the superconducting coil body, it is possible to reduce the AC loss and improve the critical current value in the superconducting device. However, depending on the shape of the stator around the superconducting coil body, the way in which leakage magnetic flux is generated may change, and the optimum value of the tilt angle may also change. Therefore, the stator core is focused on the opening defined by the front end portion 124 (see FIG. 2) located on the inner peripheral side of the cooling container including the superconducting coil body and connected to the stator core. That is, in this example, the influence of the size of the opening (slot opening width) on the AC loss and the critical current value was evaluated by simulation.

(Target of evaluation)
The same configuration as that of the superconducting device according to the first embodiment was evaluated. The analysis was performed using three types of conditions of 10 mm, 27 mm, and 44 mm as the size of the opening (slot opening).

(Examination method)
A simulation was performed in the same manner as in Example 1 above.

(result)
As a result of the simulation as described above, even if the slot opening width was changed as described above, the AC loss and the critical current value were hardly changed. That is, it was shown that the slot opening width has little influence on the AC loss and the sea current value.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The superconducting device of the present invention is particularly advantageously applied to a superconducting device using a superconducting coil body.

  DESCRIPTION OF SYMBOLS 10 Superconducting coil body, 11a, 11b Outer coil body, 12a, 12b Inner coil body, 13 1st magnetic body, 14 2nd magnetic body, 14a Side surface, 15 Superconducting wire, 15a, 15b Main surface, 16, 130 Central axis , 17 plane portion, 29 bonding agent, 37 surface portion, 41, 42 intermediate magnetic circuit member, 100 superconducting equipment, 105 cooling vessel inner tank, 106 cooling vessel outer vessel, 107 cooling vessel, 116 rotor shaft, 117 refrigerant, 118 rotations Shaft, 120 permanent magnet, 121 stator yoke, 123 stator core, 131 longitudinal axis.

Claims (4)

In superconducting equipment comprising a superconducting coil body,
The superconducting coil body includes a coil main body wound with a superconducting wire,
A magnetic circuit member made of a magnetic material, disposed to face the surface of the coil main body located on the end surface side intersecting with the main surface of the superconducting wire,
Wherein a center axis of the superconducting coil body, said main surface and a first angle between said superconducting wire state, and are more than 10 °,
The superconducting coil body is disposed so as to surround the outer periphery of the coil main body, and further includes an outer peripheral coil main body around which the superconducting wire is wound,
The outer periphery side coil body has a surface located on the end face side intersecting with the main surface of the superconducting wire,
The magnetic circuit member includes an outer peripheral side opposing surface that opposes the surface of the outer peripheral coil body portion,
Wherein a center axis of the superconducting coil body, the main surface is a second angle between the superconducting wire of the outer circumferential side coil main body portion, Ru der 10 ° or more, a superconducting apparatus. The superconducting device according to claim 1, wherein the first angle is 30 ° or more. The superconducting device according to claim 1 or 2, wherein the first angle is 45 ° or less. The coil body is
A first coil wound with the superconducting wire;
A second coil laminated on the first coil and wound with the superconducting wire,
The superconducting device according to any one of claims 1 to 3, wherein the superconducting coil body further includes an intermediate magnetic circuit member disposed between the first coil and the second coil.

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