Rotor for superconducting rotating electric machine and superconducting rotating electric machine

Abstract

To suppress deterioration of the characteristics of a superconducting wire caused by local strain occurring in a superconducting coil.SOLUTION: A rotor 1 for a superconducting rotating electric machine includes a winding mounting shaft 10, a plurality of superconducting coils 20 arranged around the winding mounting shaft 10, and at least one inter-pole support member 40 that is provided on the outer surface of the winding mounting shaft 10 and between adjacent superconducting coils 20, is in surface contact with at least a portion of the peripheral surface of each superconducting coil 20, and supports the superconducting coils 20.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] An embodiment of the present invention relates to a rotor for a superconducting rotating electric machine and a superconducting rotating electric machine. [Background technology]

[0002] In the rotor of a superconducting rotating electric machine, superconducting coils are provided at various portions of the winding mounting shaft. The superconducting coils function as field coils when cooled to an operating temperature at which they become superconducting. A known structure of this superconducting coil is one in which the coil is wound in an elliptical shape that is long in one direction. An example of the structure of a rotor 1D of this type of superconducting rotating electric machine is shown in Figs. 13 and 14. In this rotor 1, flat seats and screw holes are formed at various portions of the winding mounting shaft 10, and the superconducting coils 20 are fixed to the winding mounting shaft 10 by a coil support plate 90 and a coil support bolt 91. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-351459 Summary of the Invention [Problem to be solved by the invention]

[0004] When rotating, the rotor of a superconducting rotating electric machine is subjected to torque in the circumferential direction with respect to the central axis of rotation, and centrifugal force in the radial direction with respect to the central axis of rotation. At that time, a very large force that is specific to a rotating body and varies with time acts on the superconducting coil. That is, when rotating, the torque acts on the superconducting coil in the circumferential direction in the rotational direction, and tensile stress acts in the opposite direction. In addition, the centrifugal force acts on the superconducting coil in the radial direction of the rotating shaft, and tensile stress acts in the inner radial direction and compressive stress in the outer radial direction. In particular, when local distortion occurs in the superconducting wire in the superconducting coil, the characteristics of the superconducting wire are deteriorated, and the soundness of the rotor may be impaired.

[0005] In order to improve the power density, the number of turns of the superconducting coil may be increased to improve the spatial current density. However, if the area occupied by the superconducting coil in the radial cross section is increased or the number of poles is increased, the adjacent area between the poles of the superconducting coil is narrowed, and there is a risk that adjacent surfaces between the poles of the superconducting coil may partially contact each other during operation. In particular, bending deformation occurs in the direction perpendicular to the long axis of the superconducting coil due to centrifugal force and torque, which may cause local distortion and lead to deterioration of the superconducting coil due to this local distortion.

[0006] The embodiments of the present invention have been made in consideration of the above circumstances, and have an object to suppress deterioration of the characteristics of a superconducting wire due to local strain occurring in a superconducting coil. [Means for solving the problem]

[0007] A rotor for a superconducting rotating electric machine according to an embodiment of the present invention comprises a winding mounting shaft, a plurality of superconducting coils arranged around the winding mounting shaft, and at least one inter-pole support member provided on the outer surface of the winding mounting shaft and between adjacent superconducting coils, in surface contact with at least a portion of the circumferential surface of each of the superconducting coils, and supporting the superconducting coils. Effect of the Invention

[0008] According to the embodiment of the present invention, it is possible to suppress deterioration of the characteristics of the superconducting wire caused by local strain occurring in the superconducting coil. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a side view showing the appearance of the rotor according to the first embodiment. [Diagram 2] 2 is a cross-sectional view taken along line AA in FIG. 1 , showing a radial cross-section of the rotor; [Diagram 3] 3 is a view of the superconducting coil as seen in the U direction of FIG. 2 . [Figure 4] 4 is a cross-sectional view taken along line VV of FIG. 3 showing a cross section of a superconducting coil. [Diagram 5] FIG. [Figure 6] FIG. 11 is a side view showing the appearance of a rotor according to a second embodiment. [Figure 7] 7 is a cross-sectional view taken along line BB in FIG. 6 , showing a radial cross-section of the rotor. [Figure 8] FIG. 11 is a side view showing the appearance of a rotor according to a third embodiment. [Figure 9] 9 is a cross-sectional view taken along line CC in FIG. 8 , showing a radial cross-section of the rotor. [Figure 10] FIG. [Figure 11] FIG. 13 is a side view showing the appearance of a rotor according to a fourth embodiment. [Figure 12] 12 is a cross-sectional view taken along the line DD in FIG. 11 , showing a radial cross-section of the rotor. [Figure 13] FIG. 11 is a side view showing the appearance of a conventional rotor. [Figure 14] 14 is a ZZ cross-sectional view of FIG. 13 showing a radial cross-section of the rotor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (First embodiment) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a rotor for a superconducting rotating electric machine and a superconducting rotating electric machine will be described in detail with reference to the drawings. First, a first embodiment will be described with reference to FIGS.

[0011] Reference numeral 1 in Fig. 1 denotes a rotor for a superconducting rotating electric machine according to the first embodiment. This rotor 1 is used in a superconducting rotating electric machine (not shown). The superconducting rotating electric machine configured using the rotor 1 includes devices such as an electric motor (motor) and a generator that are cooled to an operating temperature at which the rotor is in a superconducting state and operate.

[0012] 1 and 2, rotor 1 includes a winding attachment shaft 10, a plurality of superconducting coils 20, and a plurality of inter-pole support members 40. Here, winding attachment shaft 10 includes a cylindrical portion 11, a plurality of flange portions 12, and a plurality of protrusions 13.

[0013] The cylindrical portion 11 is a member having a cylindrical shape. In a cross-sectional view (FIG. 2), the cylindrical portion 11 has an inner circumference formed in a circular shape and an outer circumference formed in a hexagonal shape. A rotating shaft (not shown) of a superconducting rotating electric machine is provided inside the cylindrical portion 11.

[0014] The plurality of flange portions 12 are provided at one and the other ends of the cylindrical portion 11. These two flange portions 12 are rotatably supported by a member such as a predetermined housing (not shown) of the superconducting rotating electric machine.

[0015] A plurality of protrusions 13 are provided on the outer peripheral surface of the tubular portion 11. For example, a protrusion 13 is provided on each of six outer peripheral surfaces of the tubular portion 11 which is hexagonal in cross section (FIG. 2). These six protrusions 13 are provided at regular intervals in the circumferential direction of the tubular portion 11. These protrusions 13 protrude in the outer radial direction from the tubular portion 11. These protrusions 13 are rectangular in side view (FIG. 1).

[0016] The multiple superconducting coils 20 are arranged around the protrusions 13. For example, a superconducting coil 20 is wound around each of the protrusions 13. These six superconducting coils 20 are provided at regular intervals in the circumferential direction of the tube portion 11. Furthermore, the superconducting coils 20 have an oval shape when viewed from the side ( FIG. 1 ). The central opening of the superconducting coils 20 has a shape that matches the shape of the rectangular protrusions 13. The central opening of the superconducting coils 20 may be fitted into the protrusions 13 or may be loosely fitted therein.

[0017] 2, superconducting coils 20 are arranged at regular intervals along the outer periphery of winding attachment shaft 10. These superconducting coils 20 are arranged so as to be point symmetric with respect to the axial center of winding attachment shaft 10.

[0018] In the first embodiment, six superconducting coils 20 are arranged, but the number is not particularly limited. As long as two or more superconducting coils 20 are arranged on the winding attachment shaft 10 in point symmetry, there is no limit to the number.

[0019] The inter-pole support members 40 are provided on the outer surface of the winding mounting shaft 10 and between adjacent superconducting coils 20, and are members that are in surface contact with at least a portion of the circumferential surface of each superconducting coil 20 and support the superconducting coils 20. For example, the inter-pole support members 40 are in contact only with linear portions of the circumferential surface of the superconducting coils 20 in a side view ( FIG. 1 ).

[0020] Each inter-pole support member 40 is a member having a rectangular shape in a side view (FIG. 1). The inter-pole support member 40 is disposed in a space (gap) in contact with the outer surface of the winding attachment shaft 10 and the adjacent peripheral surface between the poles of the superconducting coil 20. The inter-pole support member 40 is disposed so as to support and fix the superconducting coil 20. In other words, each inter-pole support member 40 is configured so as to fill the space in contact with the outer surface of the winding attachment shaft 10 and the adjacent peripheral surface between the poles of the superconducting coil 20 without leaving any gaps. Note that, in order to insulate the superconducting coil 20 from the inter-pole support member 40, an insulating material or insulating resin is used as the material for forming the inter-pole support member 40.

[0021] The inter-electrode support member 40 is formed of fiber-reinforced resin such as glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Furthermore, the inter-electrode support member 40 may be formed by attaching an insulating film such as polyimide, polyester, polyurethane, polyamide, polyamideimide, polyvinyl formal, etc., to the surface of a metal material such as an Al-based alloy, a Cu-based alloy, or stainless steel. The inter-electrode support member 40 may also be formed of a composite in which a thermosetting resin such as a phenol resin, a urea resin, or a melamine resin is applied to the surface of a metal material.

[0022] The inter-electrode support member 40 may also be formed by filling or impregnating with a thermosetting resin such as melamine resin, urea resin, epoxy resin, silicone resin, or phenol resin. The inter-electrode support member 40 may also be formed by melting and filling or impregnating with a low-melting point metal or alloy. The inter-electrode support member 40 may also be a composite in which a metal powder or an oxide powder is dispersed in a thermosetting resin.

[0023] Note that inter-pole support member 40 may be made of a material other than the above-mentioned materials as long as it is capable of supporting and fixing superconducting coil 20.

[0024] The thermal expansion coefficient of the inter-pole support member 40 is smaller than the thermal expansion coefficient of at least one of the superconducting coil 20 and the winding mounting shaft 10 .

[0025] The modulus of longitudinal elasticity (Young's modulus) of inter-pole support member 40 is smaller than the modulus of longitudinal elasticity of at least one of superconducting coil 20 and winding mounting shaft 10 .

[0026] The thermal expansion coefficient and the longitudinal elastic modulus are appropriately adjusted during the design of the rotor 1 in the process of selecting materials for the inter-pole support member 40, the superconducting coil 20, and the winding mounting shaft 10. For example, the designer of the rotor 1 selects a material for the inter-pole support member 40 whose thermal expansion coefficient and longitudinal elastic modulus are smaller than those of the superconducting coil 20 and the winding mounting shaft 10. The thermal expansion coefficient and the longitudinal elastic modulus are based on the coefficients in the temperature range during operation of the superconducting rotating electric machine.

[0027] 3 and 4, superconducting coil 20 is configured by winding superconducting wire 30 and insulating member 24 in a spiral shape around coil winding form 21. Superconducting wire 30 is, for example, a high-temperature superconducting wire. Coil winding form 21 also includes coil lead electrodes 23.

[0028] Winding section 26 is formed by superconducting wire 30 wound around coil bobbin 21 and insulating member 24. Coil insulating plates 22 are provided on the top and bottom surfaces of winding section 26. Resin layer 25 is filled or impregnated between coil insulating plates 22 on the top and bottom surfaces and winding section 26 (superconducting wire 30 and insulating member 24).

[0029] For example, the coil insulating plate 22 is formed from a fiber-reinforced resin such as glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). The coil insulating plate 22 is also formed from an insulating film such as polyimide, polyester, polyurethane, polyamide, polyamideimide, polyvinyl formal, or the like. The coil insulating plate 22 is also formed from a thermosetting resin such as phenol resin, urea resin, or melamine resin. In this way, the insulation property and mechanical strength of the winding portion 26 are improved.

[0030] 5, the superconducting wire 30 has a multilayer structure in which an intermediate layer 32, an RE (rare earth element)-based oxide superconducting layer 33, and a protective layer 34 are laminated on a tape-shaped metal substrate 31. The superconducting wire 30 is configured as a thin-film multilayer wire in which a stabilizing layer 35 is coated on the multilayer structure.

[0031] The metal substrate 31 is formed from a metal material such as stainless steel or a nickel-based alloy such as Hastelloy (registered trademark).

[0032] The intermediate layer 32 is a layer that plays a role in improving the orientation and preventing diffusion of the oxide superconducting layer 33. The intermediate layer 32 is formed of a material such as magnesium oxide.

[0033] The oxide superconducting layer 33 is a layer that exhibits a superconducting phenomenon. The oxide superconducting layer 33 is, for example, a superconducting thin film having an RE123 system (RE1Ba2Cu3Oy). Here, RE is a rare earth element, and indicates elements such as Nd, Gd, Ho, Sm, and Y.

[0034] The protective layer 34 is a layer provided for the purpose of preventing deterioration such as oxidation of the oxide superconducting layer 33. The protective layer 34 is made of a material such as Ag.

[0035] The stabilization layer 35 is provided for the purpose of shunting an excessive current when it flows through the oxide superconducting layer 33, and preventing the oxide superconducting layer 33 from burning. The stabilization layer 35 is made of a material such as Cu.

[0036] The strength of superconducting wire 30 in the wire thickness direction (direction perpendicular to the surface, lamination direction of thin films) is smaller by one order of magnitude or more than the strength in the wire width direction and longitudinal direction (in-plane direction). When stress or external force is applied in the wire thickness direction, cracks may occur in oxide superconducting layer 33 or delamination may occur. In such cases, the superconducting properties of superconducting wire 30 may deteriorate.

[0037] According to the first embodiment, an inter-pole support member 40 is provided on the outer surface of the winding attachment shaft 10 and between the adjacent superconducting coils 20. In this way, the winding attachment shaft 10 and the superconducting coils 20 can be mechanically and firmly supported via the inter-pole support member 40. This makes it possible to prevent partial contact between adjacent surfaces between the poles of the superconducting coils 20 during operation, and to prevent bending deformation in the direction perpendicular to the major axis of the superconducting coils 20 due to centrifugal force and torque. In addition, since the surface of the superconducting coils 20 is continuously supported by the inter-pole support member 40, it is possible to prevent local bending and distortion of the superconducting coils 20.

[0038] By virtue of this action, deterioration of the characteristics of superconducting wire 30 (FIG. 5) due to stress generated in superconducting coil 20 can be suppressed, and rotor 1 for a superconducting rotating electric machine that maintains its integrity can be provided.

[0039] The thermal expansion coefficient of the inter-pole support member 40 is smaller than that of at least one of the superconducting coil 20 and the winding mounting shaft 10. In this way, when the rotor 1 is cooled to the operating temperature, the thermal contraction of the inter-pole support member 40 is smaller than that of the surrounding members. Therefore, a compressive stress acts isotropically on the superconducting coil 20 from the inter-pole support member 40, and the superconducting coil 20 can be supported more firmly. Therefore, during operation, bending deformation in the direction perpendicular to the major axis of the superconducting coil 20 due to centrifugal force and torque can be prevented. Furthermore, since the surface of the superconducting coil 20 is continuously supported by the inter-pole support member 40, local bending and distortion of the superconducting coil 20 can be prevented.

[0040] By virtue of this action, deterioration of the characteristics of superconducting wire 30 (FIG. 5) due to stress generated in superconducting coil 20 can be suppressed, and rotor 1 for a superconducting rotating electric machine that maintains its integrity can be provided.

[0041] Moreover, the modulus of Young's modulus of inter-pole support member 40 is smaller than the modulus of Young's modulus of at least one of superconducting coil 20 and winding mounting shaft 10. In this way, when stress is generated at the interface between superconducting coil 20 and inter-pole support member 40 during operation of rotor 1, distortion occurs preferentially in inter-pole support member 40, making it possible to prevent distortion from occurring in superconducting coil 20. Furthermore, it is possible to prevent local bending and distortion from occurring in superconducting wire 30.

[0042] By virtue of this action, deterioration of the characteristics of superconducting wire 30 (FIG. 5) due to stress generated in superconducting coil 20 can be suppressed, and rotor 1 for a superconducting rotating electric machine that maintains its integrity can be provided.

[0043] Second embodiment Next, a second embodiment will be described with reference to Figures 6 to 7. Note that the same components as those shown in the above-described embodiment are denoted by the same reference numerals and duplicated description will be omitted.

[0044] As shown in FIGS. 6 to 7, a rotor 1A of the second embodiment includes a winding mounting shaft 10, a plurality of superconducting coils 20, a plurality of inter-pole support members 40A, and a plurality of first fixing members 50. As shown in FIG.

[0045] The rotor 1A of the second embodiment differs from the first embodiment described above in that the inter-pole support member 40A and the winding mounting shaft 10 are mechanically fixed by a first fixing member 50. In other words, the first fixing member 50 fixes the inter-pole support member 40A to the winding mounting shaft 10. The multiple first fixing members 50 are arranged side by side in the axial direction of the rotor 1A along the inter-pole support member 40A.

[0046] The first fixing member 50 is formed of, for example, a member such as a fastening bolt that is fastened to a helical insert and a screw hole provided in the winding mounting shaft 10. The first fixing member 50 is configured to apply a compressive stress to the superconducting coil 20 via the inter-pole support member 40A and the winding mounting shaft 10 by being screwed into the screw hole of the winding mounting shaft 10.

[0047] The inter-pole support member 40A is formed of the same material as the inter-pole support member 40 of the first embodiment. However, when both the inter-pole support member 40A and the winding mounting shaft 10 are formed of a metal material, they may be welded or brazed to each other. A first fixing member 50 may be formed by a welded portion or a brazed portion, and the inter-pole support member 40A and the winding mounting shaft 10 may be fixed to each other. When welding or brazing is performed, an insulating film (insulating material) or thermosetting resin (insulating resin) is not placed at the interface between the inter-pole support member 40A and the winding mounting shaft 10 so as not to impair the joining property by welding or brazing.

[0048] Alternatively, the first fixing member 50 may be formed by applying a thermosetting resin such as phenol resin, urea resin, or melamine resin, and the inter-pole support member 40A and the winding mounting shaft 10 may be fixed to each other by adhesion. Alternatively, the first fixing member 50 may be formed using materials and methods other than those described above, as long as the method can mechanically fix the inter-pole support member 40A and the outer surface of the winding mounting shaft 10 to each other.

[0049] According to the second embodiment, the inter-pole support member 40A and the winding mounting shaft 10 are more mechanically firmly fixed by the first fixing member 50, and thus the superconducting coil 20 can be more firmly supported. Therefore, the bending stress acting on the superconducting coil 20 during operation is reduced.

[0050] Due to this action, the same effects as those of the first embodiment can be obtained. Furthermore, since the bending stress acting on the superconducting coil 20 due to the centrifugal force during operation is reduced, deterioration of the characteristics of the superconducting wire 30 (FIG. 5) due to the stress generated in the superconducting coil 20 can be further suppressed, and the rotor 1A of the superconducting rotating electric machine with better soundness can be provided.

[0051] Third embodiment Next, a third embodiment will be described with reference to Figures 8 to 10. Note that the same components as those shown in the above-described embodiment are denoted by the same reference numerals, and duplicated description will be omitted.

[0052] 8 and 9, a rotor 1B of the third embodiment includes a winding mounting shaft 10, a plurality of superconducting coils 20, a plurality of inter-pole support members 40B, a plurality of outer diameter side support structures 60, and a plurality of second fixing members 70. Furthermore, the inter-pole support member 40B includes a matching portion 41 (FIG. 10) that comes into surface contact with at least a portion of the outer diameter side support structure 60.

[0053] A rotor 1B of this third embodiment differs from the first and second embodiments in that it includes an outer diameter side support structure 60 and a second fixing member 70. Furthermore, an inter-pole support member 40B includes a matching portion 41 (FIG. 10) that comes into surface contact with the surface of the outer diameter side of the rotor of the outer diameter side support structure 60.

[0054] The outer diameter side support structure 60 is a plate-like structure that supports the superconducting coil 20 from the outer diameter side. This outer diameter side support structure 60 is disposed so as to be in contact with the surface of the rotor outer diameter side of the superconducting coil 20. The outer diameter side support structure 60 may have a shape other than a plate shape, and may be, for example, a rod-like, net-like, or honeycomb-like structure.

[0055] The outer diameter side support structure 60 is disposed on the outer diameter side surface of the major axis surface of the superconducting coil 20. The outer diameter side support structure 60 is configured to restrain the outer diameter side surface of the superconducting coil 20. Note that, in order to insulate the superconducting coil 20 from the outer diameter side support structure 60, an insulating material or insulating resin may be used as the material forming the outer diameter side support structure 60. For example, the outer diameter side support structure 60 is formed from the same material as the inter-pole support member 40 of the first embodiment.

[0056] The modulus of Young's modulus of the outer diameter side support structure 60 is greater than the modulus of Young's modulus of the superconducting coil 20 .

[0057] The modulus of longitudinal elasticity is adjusted as appropriate during the design of rotor 1B in the process of selecting materials for outer diameter side support structure 60 and superconducting coil 20. For example, the designer of rotor 1B selects a material for outer diameter side support structure 60 whose modulus of longitudinal elasticity is greater than that of superconducting coil 20. The modulus of longitudinal elasticity is based on the modulus of the temperature range during operation of the superconducting rotating electric machine.

[0058] The second fixing member 70 mechanically fixes the outer diameter side support structure 60 to the winding mounting shaft 10. The multiple second fixing members 70 are arranged side by side in the axial and circumferential directions of the rotor 1B over the entire surface of the outer diameter side support structure 60.

[0059] The second fixing member 70 is composed of, for example, a member such as a fastening bolt that is fastened to a helical insert and a screw hole provided in the winding mounting shaft 10. The second fixing member 70 is configured to apply a compressive stress to the superconducting coil 20 via the outer diameter side support structure 60 and the winding mounting shaft 10 by being screwed into the screw hole of the winding mounting shaft 10.

[0060] When both the outer diameter side support structure 60 and the winding mounting shaft 10 are made of a metal material, they may be welded or brazed to each other. A second fixing member 70 may be formed by a welded portion or a brazed portion, and the outer diameter side support structure 60 and the winding mounting shaft 10 may be fixed to each other. When welding or brazing is used, an insulating film (insulating material) or thermosetting resin (insulating resin) is not placed at the interface between the outer diameter side support structure 60 and the winding mounting shaft 10 so as not to impair the joining property by welding or brazing.

[0061] Alternatively, the second fixing member 70 may be formed by applying a thermosetting resin such as phenol resin, urea resin, or melamine resin, and the outer diameter side support structure 60 and the winding mounting shaft 10 may be fixed to each other by adhesion. Alternatively, the second fixing member 70 may be formed using materials and methods other than those described above, as long as the method can mechanically fix the outer diameter side support structure 60 and the outer surface of the winding mounting shaft 10 to each other.

[0062] As shown in FIG. 10, the inter-pole support member 40B has a plate-shaped portion that contacts the surface of the outer diameter side support structure 60 and a portion that is triangular in cross section and fits between the superconducting coils 20. The plate-shaped portion of the inter-pole support member 40B is a matching portion 41. The matching portion 41 is a portion of the inter-pole support member 40B that contacts the surface of the outer diameter side support structure 60. The inter-pole support member 40B is molded so that the shape of the matching portion 41 matches (matches) the shape of the surface of the outer diameter side support structure 60. When the inter-pole support member 40B is attached to the outer surface of the outer diameter side support structure 60, the inner surface of the inter-pole support member 40B contacts the outer surface of the outer diameter side support structure 60.

[0063] According to the third embodiment, the outer diameter side support structure 60 restrains the outer diameter side surface of the superconducting coil 20. Then, the outer diameter side support structure 60 and the winding attachment shaft 10 are mechanically fixed by the second fixing member 70, thereby applying compressive stress to the superconducting coil 20 via the outer diameter side support structure 60 and the winding attachment shaft 10. Furthermore, the portion of the inter-pole support member 40B that forms a triangular shape in a cross-sectional view suppresses displacement of the outer diameter side support structure 60 and the superconducting coil 20 in the perpendicular direction to the major axis surface.

[0064] Due to this action, in addition to obtaining the same effects as those of the first and second embodiments, it is possible to further reduce the bending stress acting on the superconducting coil 20 due to the centrifugal force and torque during operation. Therefore, it is possible to further suppress the deterioration of the characteristics of the superconducting wire 30 (FIG. 5) due to the stress acting on the superconducting coil 20, and it is possible to provide the rotor 1B of the superconducting rotating electric machine with better soundness.

[0065] Moreover, the modulus of longitudinal elasticity of the outer diameter side support structure 60 is larger than that of the superconducting coil 20. Therefore, when centrifugal force and torque are generated in the superconducting coil 20 during operation, the outer diameter side support structure 60 further suppresses the displacement of the superconducting coil 20 in the direction perpendicular to the major axis, and compressive stress is applied to the superconducting coil 20 via the winding attachment shaft 10. Furthermore, since the surface of the superconducting coil 20 is continuously supported by the outer diameter side support structure 60, it is possible to prevent the superconducting coil 20 from being locally bent or distorted.

[0066] Due to this action, in addition to obtaining the same effects as those of the first and second embodiments, it is possible to further reduce the bending stress acting on the superconducting coil 20 due to the centrifugal force and torque during operation. Therefore, it is possible to further suppress the deterioration of the characteristics of the superconducting wire 30 (FIG. 5) due to the stress acting on the superconducting coil 20, and it is possible to provide the rotor 1B of the superconducting rotating electric machine with better soundness.

[0067] (Fourth embodiment) Next, a fourth embodiment will be described with reference to Figures 11 and 12. Note that the same components as those shown in the above-described embodiments are denoted by the same reference numerals and duplicated description will be omitted.

[0068] 11 and 12, a rotor 1C of the fourth embodiment includes a winding mounting shaft 10, a plurality of superconducting coils 20, a plurality of inter-pole support members 40C, a plurality of outer diameter side support structures 60, a plurality of second fixing members 70, and a plurality of third fixing members 80. Furthermore, the inter-pole support member 40C includes a matching portion 41 (FIG. 10) that comes into surface contact with at least a portion of the outer diameter side support structure 60.

[0069] The rotor 1C of the fourth embodiment differs from the first to third embodiments in that it includes a third fixing member 80. The third fixing member 80 fixes the matching portion 41 (FIG. 10) of the inter-pole support member 40C to the outer diameter side support structure 60. For example, the third fixing member 80 mechanically fixes the matching portion 41 of the inter-pole support member 40C to the surface of the outer diameter side of the rotor of the outer diameter side support structure 60. The third fixing member 80 fixes the outer diameter side support structure 60 and the matching portion 41 of the inter-pole support member 40C to each other, and a compressive stress is applied to the superconducting coil 20 via the outer diameter side support structure 60 and the inter-pole support member 40C.

[0070] The third fixing members 80 are arranged side by side in the axial and circumferential directions of the rotor 1C at positions where the inter-pole support member 40C and the outer diameter side support structure 60 overlap.

[0071] The third fixing member 80 is composed of, for example, a member such as a fastening bolt that is fastened to a helical insert and a screw hole provided in the outer diameter side support structure 60. The third fixing member 80 is configured to apply a compressive stress to the superconducting coil 20 via the outer diameter side support structure 60 by being screwed into the screw hole of the outer diameter side support structure 60.

[0072] The inter-electrode support member 40C and the outer diameter side support structure 60 are formed of the same material as the inter-electrode support member 40 of the first embodiment. However, when both the inter-electrode support member 40C and the outer diameter side support structure 60 are formed of a metal material, they may be welded or brazed to each other. Then, a second fixing member 70 may be formed by a welded portion or a brazed portion, and the inter-electrode support member 40C and the outer diameter side support structure 60 may be fixed to each other. When welding or brazing is performed, an insulating film (insulating material) or a thermosetting resin (insulating resin) is not placed at the interface between the inter-electrode support member 40C and the outer diameter side support structure 60 so as not to impair the joining property by welding or brazing.

[0073] Alternatively, the second fixing member 70 may be formed by applying a thermosetting resin such as phenol resin, urea resin, or melamine resin, and the inter-pole support member 40C and the outer diameter side support structure 60 may be fixed to each other by adhesion. Alternatively, the third fixing member 80 may be formed using a material and method other than those described above, as long as the method allows the outer surfaces of the inter-pole support member 40C and the outer diameter side support structure 60 to be mechanically fixed to each other.

[0074] According to the fourth embodiment, the inter-pole support member 40C and the outer diameter side support structure 60 are mechanically and firmly fixed by the third fixing member 80, so that the superconducting coil 20 can be more mechanically and firmly supported. Therefore, the bending stress acting on the superconducting coil 20 during operation can be reduced.

[0075] Due to this action, in addition to obtaining the same effects as those of the first to third embodiments, it is possible to further reduce the bending stress acting on the superconducting coil 20 due to the centrifugal force and torque during operation. Therefore, it is possible to further suppress the deterioration of the characteristics of the superconducting wire 30 (FIG. 5) due to the stress acting on the superconducting coil 20, and it is possible to provide a rotor 1C of a superconducting rotating electric machine with better soundness.

[0076] The present invention has been described above based on the first to fourth embodiments, but the configuration applied in any of the embodiments may be applied to other embodiments, and the configurations applied in each embodiment may be combined.

[0077] In the above embodiment, one rotor 1 includes a plurality of inter-pole support members 40, but other configurations are also possible. For example, one rotor 1 may include one inter-pole support member 40.

[0078] In the above embodiment, one inter-pole support member 40 is provided between adjacent superconducting coils 20, but other embodiments may be used. For example, a plurality of inter-pole support members 40 may be provided between adjacent superconducting coils 20.

[0079] In the above embodiment, the inter-pole support member 40 is in contact only with a linear portion of the circumferential surface of the superconducting coil 20, but other configurations are also possible. For example, the inter-pole support member 40 may be in contact with an arc-shaped portion of the circumferential surface of the superconducting coil 20, or may be in contact with the entire length of the circumferential surface of the superconducting coil 20. In such a case, the inter-pole support member 40 is molded to have a shape that matches (coincides with) the circumferential surface of the superconducting coil 20.

[0080] According to at least one of the embodiments described above, the rotor 1 includes at least one inter-pole support member 40 that is in surface contact with at least a part of the circumferential surface of the superconducting coil 20 and supports the superconducting coil 20. This makes it possible to suppress deterioration of the characteristics of the superconducting wire 30 due to local strain occurring in the superconducting coil 20.

[0081] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, modifications, and combinations can be made without departing from the spirit of the invention. These embodiments or modifications thereof are within the scope of the invention and its equivalents as described in the claims, as well as within the scope and spirit of the invention. [Explanation of symbols]

[0082] Reference Signs List 1, 1A, 1B, 1C, 1D... rotor, 10... winding mounting shaft, 11... cylindrical portion, 12... flange portion, 13... convex portion, 20... superconducting coil, 21... coil winding frame, 22... coil insulating plate, 23... coil lead electrode, 24... insulating member, 25... resin layer, 26... winding portion, 30... superconducting wire, 31... metal substrate, 32... intermediate layer, 33... oxide superconducting layer, 34... protective layer, 35... stabilizing layer, 40, 40A, 40B, 40C... inter-pole support member, 41... matching portion, 50... first fixing member, 60... outer diameter side support structure, 70... second fixing member, 80... third fixing member, 90... coil support plate, 91... coil support bolt.

Claims

1. A winding mounting shaft; A plurality of superconducting coils arranged around the winding mounting shaft; at least one inter-pole support member provided on an outer surface of the winding mounting shaft and between adjacent superconducting coils, in surface contact with at least a portion of a circumferential surface of each of the superconducting coils, and supporting the superconducting coils; Equipped with Rotor for superconducting rotating electric machine.

2. a thermal expansion coefficient of the inter-pole support member is smaller than a thermal expansion coefficient of at least one of the superconducting coil and the winding mounting shaft; 2. The rotor for a superconducting rotating electric machine according to claim 1.

3. a longitudinal elastic modulus of the inter-pole support member is smaller than a longitudinal elastic modulus of at least one of the superconducting coil and the winding mounting shaft; 3. A rotor for a superconducting rotating electric machine according to claim 1 or 2.

4. a first fixing member that fixes the inter-pole support member to the winding mounting shaft; 3. A rotor for a superconducting rotating electric machine according to claim 1 or 2.

5. an outer diameter side support structure arranged to be in contact with a surface of the rotor outer diameter side of the superconducting coil; a second fixing member that fixes the outer diameter side support structure to the winding mounting shaft; Equipped with The inter-pole support member includes a matching portion that is in surface contact with at least a portion of the outer diameter side support structure.

3. A rotor for a superconducting rotating electric machine according to claim 1 or 2.

6. The modulus of elasticity of the outer diameter side support structure is greater than the modulus of elasticity of the superconducting coil.

6. The rotor for a superconducting rotating electric machine according to claim 5.

7. a third fixing member that fixes the matching portion to the outer diameter side support structure; 6. The rotor for a superconducting rotating electric machine according to claim 5.

8. A rotor for a superconducting rotating electric machine according to claim 1 or 2, Superconducting rotating motor.

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