JP2014057087A - Rotary device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a superconducting coil having improved performance, a rotary device and a method for manufacturing the superconducting coil.SOLUTION: A superconducting coil 10 which is a saddle type superconducting coil wound by superconducting wire material in a racetrack shape, comprises a bent portion 10b and a straight portion 10a connected to the bent portion 10b. In the bent portion 10b, an upper edge 10c is positioned at inner circumferential side from a lower edge 10d, and in the straight portion 10a, the upper edge 10c is positioned at the outer circumferential side from the lower edge 10d.

Description

  The present invention relates to a rotating device.

  Conventionally, a superconducting coil formed by winding a superconducting wire has been disclosed (for example, Japanese Patent Publication No. 7-79048 (Patent Document 1)). Patent Document 1 discloses a method for connecting saddle-shaped superconducting magnet coils. Patent Document 1 discloses connecting a saddle-shaped superconducting magnet coil by superposing and arranging an inner layer coil and an outer layer coil wound with superconducting wires having different cross-sectional dimensions and connecting them in series. .

Japanese Patent Publication No. 7-79048

  In Patent Document 1, since the superconducting coil is formed in a bowl shape, the bottom surface of the coil end portion (curved portion) is curved. For this reason, since the bottom face of the superconducting coil can be along the cylindrical surface, the bowl-shaped superconducting coil can be arranged along the cylindrical surface.

  However, in order to form a bowl-shaped superconducting coil, it is necessary to wrap the superconducting wire so that the bottom surface of the coil end portion is curved. Superconducting wires have a direction that is easy to bend (flatwise) and a direction that is difficult to bend (edgewise). In order to manufacture the bowl-shaped superconducting coil of Patent Document 1, it is necessary to bend the superconducting wire in such a direction that it is difficult to bend. If the superconducting wire is bent in a direction that is difficult to bend, the performance of the superconducting wire will deteriorate. Therefore, there is a problem that the performance of the superconducting coil of Patent Document 1 is deteriorated.

  Therefore, an object of the present invention is to provide a rotating device with improved performance.

In the rotating device of the present invention, the superconducting wire is wound so that the upper edge is positioned on the inner peripheral side with respect to the lower edge in the curved portion, and the upper edge is positioned on the outer peripheral side with respect to the lower edge in the linear portion. It has a superconducting coil. The superconducting coil includes a first superconducting coil and a second superconducting coil. The first superconducting coil is disposed along the arcuate outer surface of the rotor shaft. The second superconducting coil is disposed along the arcuate outer surface of the stator yoke. According to the rotating device of the present invention, the superconducting coil that can suppress the deterioration of the performance is used. For this reason, deterioration of the performance of the rotating device can be suppressed. Further, since the superconducting coil has a bowl shape, the bottom (lower edge) of the superconducting coil can be arranged along the cylindrical surface of the rotating device. For this reason, size reduction can be achieved.

  As described above, according to the rotating device of the present invention, the curved portion has the superconducting coil in which the upper edge is located on the inner peripheral side with respect to the lower edge and the linear portion has the upper edge located on the outer peripheral side with respect to the lower edge. Therefore, it is possible to suppress degradation of performance. Further, since the superconducting coil has a bowl shape, the bottom (lower edge) of the superconducting coil can be arranged along the cylindrical surface of the rotating device. For this reason, size reduction can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS The superconducting coil in Embodiment 1 of this invention is shown schematically, (A) is a perspective view, (B) is a side view when it sees from the arrow I (B) of (A). It is a schematic diagram which shows roughly the upper edge and lower edge of the superconducting coil in Embodiment 1 of this invention. FIG. 3 is a schematic sectional view taken along line III-III in FIG. 2. FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 2. FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. 2. (A) is schematic sectional drawing which follows the VI (A) -VI (A) line in FIG. 1, (B) is schematic which follows the VI (B) -VI (B) line in FIG. FIG. It is a perspective view which shows roughly the superconducting wire in Embodiment 1 of this invention. It is a perspective view which shows roughly the superconducting wire in Embodiment 1 of this invention. It is a figure for demonstrating the flatwise of the superconducting wire in Embodiment 1 of this invention. It is a figure for demonstrating the edgewise of the superconducting wire in Embodiment 1 of this invention. It is a top view which shows roughly the apparatus for manufacturing the superconducting coil in Embodiment 1 of this invention. FIG. 12 is a schematic cross-sectional view taken along line XII-XII in FIG. 11. FIG. 12 is a schematic cross-sectional view taken along line XIII-XIII in FIG. 11. 6 is a perspective view schematically showing a superconducting coil in Comparative Example 1. FIG. 6 is a plan view schematically showing a superconducting coil in Comparative Example 1. FIG. It is a schematic diagram which shows roughly the upper edge and lower edge of the superconducting coil in the comparative example 2. It is a schematic sectional drawing which follows the XVII-XVII line in FIG. FIG. 17 is a schematic cross-sectional view taken along XVIII-XVIII in FIG. 16. It is sectional drawing which shows schematically the motor in Embodiment 2 of this invention. It is a perspective view which shows roughly the rotor in Embodiment 2 of this invention. It is a perspective view which shows roughly the stator in Embodiment 2 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)
With reference to FIGS. 1-10, the superconducting coil 10 in one embodiment of this invention is demonstrated. Superconducting coil 10 in the present embodiment is a saddle-shaped superconducting coil in which superconducting wire 11 is wound in a racetrack shape, as shown in FIGS. That is, when the superconducting coil 10 is viewed from above, it has a racetrack shape.

  The superconducting coil 10 includes a straight portion 10a and a bending portion 10b connected to the straight portion 10a. The straight portion 10a is a straight portion extending in the major axis direction, and the curved portion 10b is a portion (coil end portion) that becomes a curve when viewed from above. As shown in FIG. 1B, the curved portion 10b has a bowl shape in which a lower edge 10d as a bottom portion is curved in an arc shape.

  FIG. 2 shows a course in which the upper edge 10c is located and a course in which the lower edge 10d is located in one superconducting wire 11 constituting the superconducting coil 10, and other superconducting wires 11 and the like are omitted. In FIG. 2, the center R indicates the center of the arc of the superconducting wire at the curved portion 10 b.

  As shown in FIGS. 2 and 3, in the bending portion 10b, the upper edge 10c is located on the inner peripheral side (hollow side surrounded by the superconducting coil 10) than the lower edge 10d. That is, in the bending portion 10b, the distance R10c between the upper edge 10c and the center R is narrower than the distance R10d between the lower edge 10d and the center R.

  As shown in FIGS. 2 and 4, in the straight portion 10a, the upper edge 10c is located on the outer peripheral side (the opposite side to the hollow side surrounded by the superconducting coil 10) than the lower edge 10d. That is, in the straight portion 10a, the distance R10c between the upper edge 10c and the center R is wider than the distance R10d between the lower edge 10d and the center R.

  As shown in FIGS. 2 and 5, there is a position where the upper edge 10c and the lower edge 10d coincide in the circumferential direction. In other words, the surface formed by the upper edge 10c and the lower edge 10d at this position is parallel to an axis passing through the center R. At this position, the distance R10c between the upper edge 10c and the center R and the distance R10d between the lower edge 10d and the center R are the same. This position may exist at a position where the straight portion 10a and the bending portion 10b are connected, or may exist at the straight portion 10a or the bending portion 10b.

  Moreover, it is preferable that the length of the upper edge 10c and the lower edge 10d is the same. In this case, the superconducting wire 11 is arranged so that the inclination of the superconducting wire 11 gradually changes in the bending portion 10b.

  When superconducting wire 11 is arranged in this way, as shown in FIGS. 6A and 6B, the directions of inclination of superconducting wire 11 are opposite to each other in the longitudinal direction and the short direction of superconducting coil 10.

  The above-described upper edge 10c and lower edge 10d appear when the superconducting coil 10 is placed on a flat surface. Therefore, when the superconducting coil 10 is placed opposite to the state shown in FIG. 1 (when the upper edge 10c is placed on the lower side and the lower edge 10d is placed on the upper side), the upper edge of the curved portion is more peripheral than the lower edge. The upper edge is located on the inner peripheral side with respect to the lower edge in the linear portion.

  Here, the superconducting wire 11 constituting the superconducting coil 10 will be described. The superconducting wire 11 has a tape shape, and a bismuth (Bi) -based superconducting wire may be used as shown in FIG. 7, or a thin film superconducting wire may be used as shown in FIG.

  As shown in FIG. 7, the bismuth-based superconducting wire has a plurality of superconductors 11a extending in the longitudinal direction and a sheath portion 11b covering the entire circumference of the plurality of superconductors 11a. The sheath part 11b is in contact with the superconductor 11a. Each of the plurality of superconductors 11a is preferably, for example, a bismuth-based superconductor having a Bi-Pb-Sr-Ca-Cu-O-based composition, and in particular, an atomic ratio of (bismuth and lead): strontium: calcium: copper. Is optimally a material containing a Bi2223 phase represented by an approximate ratio of 2: 2: 2: 3. The material of the sheath portion 11b is made of, for example, silver or a silver alloy. A single superconductor 11a may be provided.

  As shown in FIG. 8, the thin film superconducting wire is formed on the substrate 11c, the intermediate layer 11d provided in contact with the substrate 11c, the superconducting layer 11e provided in contact with the intermediate layer 11d, and the superconducting layer 11e. And a stabilizing layer 11f provided in contact therewith.

  The substrate 11c is made of a metal such as stainless steel, nickel alloy (for example, Hastelloy), or silver alloy. The intermediate layer 11d is made of, for example, yttria stabilized zirconia, cerium oxide, magnesium oxide, or strontium titanate. Note that the intermediate layer 11d may be omitted.

Superconducting layer 11e is made of, for example, an RE123-based superconductor. The RE123-based superconductor, the _{RE x Ba y Cu z O 7} -d, is 0.7 ≦ x ≦ 1.3,1.7 ≦ y ≦ 2.3,2.7 ≦ z ≦ 3.3 Means that. The RE of the RE123-based superconductor means a material containing at least one of a rare earth element and an yttrium element. Examples of rare earth elements include neodymium (Nd), gadolinium (Gd), holmium (Ho), and samarium (Sm). The RE123-based superconducting wire has the advantage that the critical current density at the liquid nitrogen temperature (77.3 K) is higher than that of the bismuth-based superconducting wire. Moreover, it has the advantage that the critical current value is high under low temperature and constant magnetic field. On the other hand, since the RE123-based superconductor cannot be covered with the sheath portion unlike the bismuth-based superconductor, the superconductor (superconducting thin film material) is formed on the oriented metal substrate only by the vapor phase method or the liquid phase method. It is manufactured by the method.

  The stabilizing layer 11f is a layer provided for protecting the surface of the superconducting layer 11e, and is made of, for example, silver or copper. The stabilization layer 11f may be omitted.

  As shown in FIGS. 7 and 8, when the superconducting wire 11 is wound in a racetrack shape, the upper surface 12 located at the upper edge 10c, the lower surface 13 located at the lower edge 10d, and the side surfaces 14, 15 The superconducting wire 11 has About the superconducting wire 11 shown in FIG. 8, you may wind so that an upper surface and a lower surface may become reverse. When the superconducting layer 11e is arranged on the inner peripheral side, it is possible to suppress the compressive stress from being applied to the superconducting layer 11e, which is advantageous in that the deterioration of the superconducting layer 11e can be suppressed. In the case where the superconducting layer 11e is disposed outside, it is advantageous in that it can easily be connected to an external power source.

  As shown in FIG. 9, the superconducting wire 11 is placed so that the side surface 14 extending in one longitudinal direction is located on the inner peripheral side and the side surface 15 extending in the other longitudinal direction is located on the outer peripheral side (in the direction of the arrow in FIG. 9). When bent, the curved portion 10b can be formed. In this direction, the superconducting wire 11 is easy to bend (flatwise).

  On the other hand, as shown in FIG. 10, when the superconducting wire 11 is bent so that the lower surface 13 located at the lower edge 10d is along an arc (in the direction of the arrow shown in FIG. 10), a bowl shape can be formed. In this direction, the superconducting wire 11 is difficult to bend (edgewise).

  Then, with reference to FIGS. 11-13, the manufacturing method of the superconducting coil 10 in this Embodiment is demonstrated. First, as shown in FIGS. 11 to 13, first, a pedestal 51 having a cylindrical surface is prepared.

  Next, a racetrack-like bowl-shaped winding frame 52 is disposed on the cylindrical surface 51 a of the pedestal 51. The reel 52 has a curved portion 52b and a straight portion 52a connected to the curved portion 52b. In the curved portion 52b, the upper edge 52c is located on the inner peripheral side with respect to the lower edge 52d. In the straight part 52a, the upper edge 52c is located on the outer peripheral side with respect to the lower edge 52d.

  Next, the superconducting wire 11 is wound around the cylindrical surface 51 a of the pedestal 51 along the winding frame 52. By winding the superconducting wire 11 on the cylindrical surface 51a, a bowl shape can be formed. By winding the superconducting wire 11 along the winding frame 52, bending the superconducting wire 11 edgewise can be suppressed.

  By performing the above steps, superconducting coil 10 in the present embodiment shown in FIG. 1 can be manufactured. When manufactured in this manner, it is possible to suppress cracks in the superconducting wire 11 as compared to the case where the superconducting wire 11 is wound in a racetrack shape and then pressed into a bowl shape.

  Next, the effect of the superconducting coil 10 in the present embodiment will be described in comparison with the superconducting coil 20 of Comparative Example 1 shown in FIGS. 14 and 15 and the superconducting coil 30 of Comparative Example 2 shown in FIGS. .

  As shown in FIGS. 14 and 15, the superconducting coil 20 in the comparative example 1 has a racetrack shape having a straight portion 20a and a curved portion 20b, and the curved portion 20b is not saddle-shaped. That is, as shown in FIG. 15 which is a side view when viewed from the arrow XV in FIG. 14, in the bending portion 20b, the upper edge 20c and the lower edge 20d are flat. Since the superconducting coil 20 of the comparative example 1 cannot be disposed along the cylindrical surface, there is a problem that it is not possible to reduce the size.

  In the racetrack-shaped superconducting coil 20 of Comparative Example 1, the side surface of the superconducting wire and the central axis of the arc at the curved portion are parallel. For this reason, it can suppress that the force of edgewise bending is applied in a curved part.

  FIG. 16 shows a course in which the upper edge 10c is located and a course in which the lower edge 10d is located in one superconducting wire 11 constituting the superconducting coil 10, and other superconducting wires 11 and the like are omitted. In FIG. 16, the center R indicates the center of the arc of the superconducting wire at the curved portion.

  As shown in FIGS. 16 to 18, the superconducting coil 30 in the comparative example 2 has a racetrack shape having a straight portion and a curved portion as in the comparative example 1, and the curved portion has a bowl shape. In the curved portion, as shown in FIG. 17, the upper edge 10c of the superconducting wire 11 is located on the inner peripheral side with respect to the lower edge 10d. That is, in the curved portion, the distance R10c between the upper edge 10c and the center R is narrower than the distance R10d between the lower edge 10d and the center R. In the straight line portion, as shown in FIG. 18, the upper edge 10c and the lower edge 10d of the superconducting wire 11 coincide with each other in the circumferential direction. That is, the distance R10d between the upper edge 10c and the center R and the distance R10d between the lower edge 10d and the center R are the same. For this reason, in the superconducting wire constituting the superconducting coil 30 of Comparative Example 2, the length passing through the lower edge 10d is larger than the length passing through the upper edge 10c.

  In such a superconducting coil 30 of Comparative Example 2, in order to form a bowl shape, as described above, as shown in FIGS. 16 to 18, the side surfaces 14 and 15 of the superconducting wire 11 are inclined by the bending portion 10 b. There is a need. In other words, it is necessary to incline the side surface of the superconducting wire from the central axis of the arc at the curved portion. In this case, the superconducting wire 11 is maintained in a state where an edgewise bending force is applied. For this reason, in the superconducting coil 30 of the comparative example 2, although it can arrange | position along a cylindrical surface, there exists a problem that the performance of the superconducting wire 11 will deteriorate.

  In superconducting coil 10 in the present embodiment, upper edge 10c is located on the inner peripheral side with respect to lower edge 10d in curved portion 10b, and upper edge 10c is located on the outer peripheral side with respect to lower edge 10d in linear portion 10a. Thus, the superconducting wire 11 is wound. Thereby, the difference in length between the upper edge 10c and the lower edge 10d of the superconducting coil 10 can be reduced. For this reason, it can suppress that the force (edgewise bending) of the direction which is hard to bend is applied to the superconducting wire 11. That is, the edgewise bending component is canceled by gradually changing the inclination of the side surfaces 14 and 15 of the superconducting wire 11 at the bending portion 10b. Therefore, since the deterioration of the performance of the superconducting wire 11 can be suppressed, the deterioration of the performance of the superconducting coil 10 can be suppressed.

  Moreover, since the bending part 10b is bowl shape, the superconducting coil 10 can be arrange | positioned along a cylindrical surface. For this reason, when the superconducting coil 10 of the present embodiment is used in a rotating device, the rotating device can be downsized.

  As described above, according to the superconducting coil 10 according to the present embodiment, the superconducting characteristics of the racetrack-like comparative example 1 superconducting coil 20 that is not saddle-shaped can be maintained, and arranged along the cylindrical surface of the saddle-shaped comparative example 2. Combined with possible effects.

(Embodiment 2)
With reference to FIGS. 19-21, the motor 100 in one Embodiment of the rotary equipment of this invention is demonstrated. As shown in FIG. 19, the motor 100 includes a rotor 110 that is a rotor and a stator 120 that is a stator arranged around the rotor 110.

  As shown in FIGS. 19 and 20, rotor 110 includes superconducting coil 10 according to the first embodiment, rotating shaft 118, rotor core 113, rotor shaft 116, and refrigerant 117.

  The rotor shaft 116 is formed around the outer peripheral surface extending in the long axis direction of the rotating shaft 118. The outer surface of the rotor shaft 116 has an arc shape. The rotor core 113 extends radially from a central portion (region where the rotation shaft 118 is disposed) in a cross section intersecting the rotation shaft 118 of the rotor shaft 116 so as to protrude from the outer peripheral surface of the rotor shaft 116. Superconducting coil 10 is disposed so as to surround rotor core 113 and along the arcuate outer surface of rotor shaft 116. The refrigerant 117 cools the superconducting coil 10. The superconducting coil 10 and the refrigerant 117 are disposed inside the heat insulating container.

  A stator 120 as a stator of the motor 100 is formed around the rotor 110. Stator 120 includes superconducting coil 10 according to the first embodiment, stator yoke 121, refrigerant 127, and stator core 123.

  The stator yoke 121 surrounds the outer periphery of the rotor core 113. The outer surface of the stator yoke 121 has an arc shape. Superconducting coil 10 is arranged along the arcuate outer surface of stator yoke 121. The refrigerant 127 cools the superconducting coil 10. The superconducting coil 10 and the refrigerant 127 are disposed inside the heat insulating container. The heat insulating container has an opening at the center of the superconducting coil 10 so that a part of the stator core 123 is disposed. The stator core 123 is disposed so as to surround the superconducting coil 10 and penetrate the central portion of the superconducting coil 10. In FIG. 21, the stator core 123 is not shown.

  In the present embodiment, superconducting coil 10 of rotor 110 and a part of rotor core 113 passing through the center of superconducting coil 10 are arranged, but the number of rotor cores 113 is six, eight, three, for example. It can be an arbitrary number such as a book. Similarly, in the present embodiment, the superconducting coil 10 of the stator 120 and a part of the stator core 123 that penetrates the center of the superconducting coil 10 are arranged, but for example, four, eight, three, etc. It can be the number.

  As described above, the motor 100 as the rotating device in the present embodiment includes the superconducting coil 10 in the first embodiment. That is, a superconducting coil that can suppress performance degradation is used. For this reason, deterioration of the performance of the motor 100 can be suppressed. Moreover, since the superconducting coil 10 has a bowl shape, the bottom (lower edge) of the superconducting coil 10 can be disposed along the cylindrical surface. For this reason, the motor 100 can be reduced in size.

  In the present embodiment, the motor 100 including the rotor 110 and the stator 120 is described as an example of the rotating device. However, the rotating device of the present invention is not particularly limited to the motor, and may be, for example, a generator. Is also applicable.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

  10, 20, 30 Superconducting coil, 10a, 20a, 52a Linear portion, 10b, 20b, 52b Bending portion, 10c, 20c, 52c Upper edge, 10d, 20d, 52d Lower edge, 11 Superconducting wire, 11a Superconductor, 11b Sheath Part, 11c substrate, 11d intermediate layer, 11e superconducting layer, 11f stabilization layer, 12 upper surface, 13 lower surface, 14, 15 side surface, 51 pedestal, 51a cylindrical surface, 52 winding frame, 100 motor, 110 rotor, 113 rotor core, 116 Rotor shaft, 117, 127 Refrigerant, 118 Rotating shaft, 120 Stator, 121 Stator yoke, 123 Stator core, R center, R10c, R10d Distance.

In the rotating device of the present invention, the superconducting wire is wound so that the upper edge is positioned on the inner peripheral side with respect to the lower edge in the curved portion, and the upper edge is positioned on the outer peripheral side with respect to the lower edge in the linear portion. It has a superconducting coil . The superconducting coil is arranged along at least one of the arcuate outer surface of the rotor shaft and the arcuate outer surface of the stator yoke . According to the rotating device of the present invention, the superconducting coil that can suppress the deterioration of the performance is used. For this reason, deterioration of the performance of the rotating device can be suppressed. Further, since the superconducting coil has a bowl shape, the bottom (lower edge) of the superconducting coil can be arranged along the cylindrical surface of the rotating device. For this reason, size reduction can be achieved.

Claims (3)

A superconducting coil in the shape of a race, with a superconducting wire wound around a racetrack,
A curved portion;
A linear portion connected to the curved portion,
In the curved portion, the upper edge is located on the inner peripheral side than the lower edge,
A superconducting coil in which the upper edge is located on the outer peripheral side of the lower edge in the straight line portion.   A rotating device comprising the superconducting coil according to claim 1. Preparing a pedestal having a cylindrical surface;
Placing a racetrack-like bowl-shaped winding frame on the cylindrical surface of the pedestal;
Winding the superconducting wire along the winding frame on the cylindrical surface of the pedestal,
The winding frame has a curved portion and a straight portion connected to the curved portion, wherein the upper edge is located on the inner peripheral side of the lower edge in the curved portion, and the upper edge is the lower edge in the straight portion. The manufacturing method of a superconducting coil located in the outer peripheral side rather than.

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