Rotor of superconducting rotating electric machine and superconducting rotating electric machine

Abstract

To suppress deterioration of the characteristics of a superconducting wire due to local strain introduced by stress acting on a superconducting coil. [Solution] The rotor of a superconducting rotating electric machine according to an embodiment comprises a winding mounting shaft, a superconducting coil arranged around the winding mounting shaft, a first coil surface support member that presses the surface of the superconducting coil on the outer diameter side of the rotor, a second coil surface support member that presses the surface of the superconducting coil on the inner diameter side of the rotor, and an inter-surface connecting member that mechanically connects the first coil surface support member and the second coil surface support member.

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 these superconducting coils is one in which the coils are wound in an oval shape that is elongated in one direction.

[0003] A known method for fixing a superconducting coil to a winding mounting shaft is to form a flat seat and a screw hole in the winding mounting shaft and fix the superconducting coil to the winding mounting shaft with a coil support plate and a coil support bolt (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 4-351459 Summary of the Invention [Problem to be solved by the invention]

[0005] During rotation, the rotor of a superconducting rotating electric machine is subjected to torque in the circumferential direction relative to the central axis of rotation and centrifugal force in the radial direction relative to the central axis of rotation. At this time, very large, time-varying forces specific to rotating bodies act on the superconducting coil. That is, during rotation, the torque causes compressive stress in the circumferential direction of the superconducting coil in the rotational direction and tensile stress in the reverse direction, while the centrifugal force causes tensile stress in the inner radial direction and compressive stress in the outer radial direction of the rotor shaft. In particular, if local strain is introduced into the superconducting wire in the superconducting coil, the characteristics of the superconducting wire may deteriorate, potentially damaging the soundness of the superconducting rotor.

[0006] In conventional methods, if the coil support plate is insufficiently strong, centrifugal force and torque during operation can deform the superconducting coil along with the coil support plate. This can introduce bending deformation perpendicular to the longitudinal axis of the superconducting coil, resulting in localized strain and potential degradation of the superconducting coil. On the other hand, if the coil support plate's thickness is increased to improve its strength, the distance between the superconducting coil and the armature coil increases. The reduced area occupied by the superconducting coil reduces the spatial current density, resulting in a decrease in the power density (output / weight) of the superconducting rotating electric machine. The reduced power density of a superconducting rotating electric machine poses a barrier to miniaturization and may limit its application. For example, when applying superconducting rotating electric machines to electrify aircraft, it becomes difficult to achieve miniaturization, weight reduction, and high power output (high power density).

[0007] An object of the present invention is to provide a rotor for a superconducting rotating electric machine and a superconducting rotating electric machine that can suppress deterioration of the characteristics of the superconducting wire due to local strain introduced into the superconducting coil. [Means for solving the problem]

[0008] The rotor of a superconducting rotating electric machine according to an embodiment comprises a winding mounting shaft, a superconducting coil arranged around the winding mounting shaft, a first coil surface support member that presses the surface of the superconducting coil on the outer diameter side of the rotor, a second coil surface support member that presses the surface of the superconducting coil on the inner diameter side of the rotor, and a surface-to-surface connecting member that mechanically connects the first coil surface support member and the second coil surface support member. [Effects of the Invention]

[0009] According to the embodiments of the present invention, it is possible to suppress deterioration of the characteristics of the superconducting wire due to local strain introduced into the superconducting coil. [Brief explanation of the drawings]

[0010] [Figure 1]FIG. 1 is an external view showing an example of the structure of a rotor of a superconducting rotating electric machine according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing an example of the cross-sectional shape of the structure shown in FIG. 1 taken along the line AA. [Figure 3] FIG. 3 is a cross-sectional view showing a first connection form for connecting the inter-surface connecting member 50 and the coil surface supporting members 40A and 40B. [Figure 4] FIG. 4 is a cross-sectional view showing a second connection form for connecting the inter-surface connecting member 50 and the coil surface supporting members 40A and 40B. [Figure 5] FIG. 5 is a conceptual diagram showing an example of the shape of superconducting coil 20 when viewed from the outer diameter side of the rotor. [Figure 6] FIG. 6 is a cross-sectional view showing an example of the cross-sectional shape of the structure shown in FIG. 5 at the VV cross section. [Figure 7] FIG. 7 is a cross-sectional view showing an example of the configuration of superconducting wire 30 shown in FIG. [Figure 8] FIG. 8 is an external view showing an example of the structure of the rotor 1 of the superconducting rotating electric machine according to the second embodiment. [Figure 9] FIG. 9 is an external view showing a modified example of the structure shown in FIG. [Figure 10] FIG. 10 is a cross-sectional view showing an example of the structure of a rotor of a superconducting rotating electric machine according to the third embodiment. [Figure 11] FIG. 11 is a cross-sectional view showing a modification of the structure shown in FIG. [Figure 12] FIG. 12 is a cross-sectional view showing an example of the structure of a rotor of a superconducting rotating electric machine according to the fourth embodiment. [Figure 13] FIG. 13 is a cross-sectional view showing a modification of the structure shown in FIG. [Figure 14] FIG. 14 is an enlarged view showing the main part of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments will be described with reference to the drawings.

[0012] First Embodiment First, the first embodiment will be described.

[0013] (Basic structure of rotor in superconducting rotating electric machine) First, the basic structure of the rotor of the superconducting rotating electric machine according to the first embodiment will be described with reference to FIGS.

[0014] Fig. 1 is an external view showing an example of the structure of a rotor of a superconducting rotating electric machine according to Embodiment 1. Fig. 2 is a cross-sectional view showing an example of the cross-sectional shape of the structure shown in Fig. 1 taken along line AA.

[0015] The rotor 1 of the superconducting rotating electric machine shown in Figures 1 and 2 has a winding mounting shaft 10, a superconducting coil 20, a coil surface support member 40A (or a first coil surface support member 40A), a coil surface support member 40B (or a second coil surface support member 40B), an inter-surface connecting member 50, etc.

[0016] Superconducting coils 20 are arranged in the circumferential direction of the rotor at regular intervals on each part of the winding mounting shaft 10. A filler (not shown) may be present between the winding mounting shaft 10 and the superconducting coils 20.

[0017] The superconducting coils 20 are arranged so as to be point symmetric with respect to the axial center of the rotor 1. Although an example in which six superconducting coils 20 are arranged is shown in Fig. 1 and Fig. 2, there is no limit to the number of superconducting coils 20, and there is no limit to the number as long as two or more superconducting coils 20 are arranged so as to be point symmetric.

[0018] The coil surface support member 40A is arranged so as to press the surface of the superconducting coil 20 on the rotor outer diameter side. The coil surface support member 40B is arranged so as to press the surface of the superconducting coil 20 on the rotor inner diameter side. The inter-surface connection member 50 mechanically connects the coil surface support member 40A and the coil surface support member 40B, and is configured to apply compressive stress to the surface of the superconducting coil 20 on the rotor outer diameter side and the surface of the rotor inner diameter side (hereinafter, sometimes referred to as the "top and bottom surfaces").

[0019] 2, the surface-to-surface connecting member 50 mechanically connects the coil surface supporting member 40A and the coil surface supporting member 40B on the outer periphery side of the superconducting coil 20. The surface-to-surface connecting member 50 is preferably configured to be in surface contact with the superconducting coil 20.

[0020] The connection between the coil surface support members 40A, 40B and the inter-face connecting member 50 may be achieved, for example, by fastening the coil surface support members 40A, 40B to the inter-face connecting member 50 using helical inserts or screw holes and fastening bolts provided in advance in the coil surface support members 40A, 40B, or by welding, brazing, or the like. Alternatively, the coil surface support members 40A, 40B and the inter-face connecting member 50 may be bonded and fixed by applying a thermosetting resin such as phenol resin, urea resin, or melamine resin. Materials and methods other than those mentioned above may also be used as long as they can mechanically fasten the coil surface support members 40A, 40B to the inter-face connecting member 50.

[0021] The coil surface support members 40A, 40B and the surface-to-surface connecting member 50 may be formed from, for example, glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP), or may be formed from a composite in which an insulating film such as polyimide, polyester polyurethane, polyamide, polyamideimide, or polyvinyl formal is attached to the surface of an Al-based alloy, Cu-based alloy, stainless steel, or the like, or a thermosetting resin such as phenol resin, urea resin, or melamine resin is applied. Alternatively, a composite in which metal powder or oxide powder is dispersed in a thermosetting resin may be used.

[0022] The elastic coefficient of each of the coil surface support members 40A, 40B is desirably larger than the elastic coefficient of the superconducting coil 20, and the thermal expansion coefficient of each of the coil surface support members 40A, 40B is desirably larger than the thermal expansion coefficient of the superconducting coil 20. In addition, the thermal expansion coefficient of the inter-face connecting member 50 is desirably larger than the thermal expansion coefficient of the superconducting coil 20.

[0023] (Connection between inter-surface connecting member 50 and coil surface supporting members 40A, 40B) The form of connection between the inter-surface connecting member 50 and the coil surface supporting members 40A, 40B is not limited to the example shown in FIG. 2, and may be changed as appropriate.

[0024] Fig. 3 shows a first connection form for connecting the inter-face connecting member 50 and the coil surface support members 40A, 40B. Fig. 4 shows a second connection form for connecting the inter-face connecting member 50 and the coil surface support members 40A, 40B. Here, an example is shown in which tightening screws are used as the connection method.

[0025] FIG. 3 shows a specific example of a connection form for connecting the inter-surface connecting member 50 shown in FIG. 2 to the coil surface supporting members 40A and 40B.

[0026] 3, a partial surface 40a of the coil surface support member 40A is connected to the surface of the face-to-face connection member 50 on the rotor outer diameter side, and a partial surface 40b of the coil surface support member 40B is connected to the surface of the face-to-face connection member 50 on the rotor inner diameter side. In this case, a screw 70A is inserted from the rotor outer diameter side of the coil surface support member 40A to fix the coil surface support member 40A and the face-to-face connection member 50. A screw 70B is inserted from the rotor inner diameter side of the coil surface support member 40B to fix the coil surface support member 40B and the face-to-face connection member 50.

[0027] FIG. 4 shows a specific example of a connection topology different from that shown in FIG.

[0028] 4, a partial surface of the inter-face connection member 50 is connected to the rotor circumferential side surface 40c of the coil surface support member 40A, and a partial surface of the inter-face connection member 50 is connected to the rotor circumferential side surface 40d of the coil surface support member 40B. In this case, the screw 70A is inserted from the rotor circumferential side of the inter-face connection member 50 to secure the inter-face connection member 50 and the coil surface support member 40A together. The screw 70B is inserted from the rotor circumferential side of the inter-face connection member 50 to secure the inter-face connection member 50 and the coil surface support member 40B together.

[0029] (Configuration of superconducting coil 20 and its surroundings) Fig. 5 is a conceptual diagram showing an example of the shape of superconducting coil 20 when viewed from the outer diameter side of the rotor. Fig. 6 is a cross-sectional view showing an example of the cross-sectional shape at VV cross section of the structure shown in Fig. 5. Note that coil surface support members 40A, 40B and inter-surface connecting member 50 are not shown in Figs. 5 and 6.

[0030] As shown in Figures 5 and 6, superconducting coil 20 is formed by spirally winding high-temperature superconducting wire (hereinafter referred to as "superconducting wire 30") and insulating member 24 around coil bobbin 21 (including coil lead electrode 23), and coil insulating plates 22 are arranged on the top and bottom surfaces of winding portion 26 formed thereby, and resin layer 25 is filled and impregnated between coil insulating plates 22 on the top and bottom surfaces and winding portion 26 (superconducting wire 30 and insulating member 24).

[0031] The coil insulating plate 22 is formed from an insulating film such as polyimide, polyester polyurethane, polyamide, polyamideimide, or polyvinyl formal, a thermosetting resin such as phenolic resin, urea resin, or melamine resin, or a glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP), and provides insulation protection and improves the mechanical strength of the winding portion 26.

[0032] (Configuration of superconducting wire 30) FIG. 7 shows an example of the configuration of superconducting wire 30 shown in FIG.

[0033] The superconducting wire 30 is composed of a thin-film multilayer wire having 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, and coated with a stabilizing layer 35.

[0034] The tape-shaped metal substrate 31 is made of, for example, stainless steel or a nickel-based alloy such as Hastelloy (registered trademark).

[0035] The intermediate layer 32 is a layer that plays a role in improving the orientation of the oxide superconducting layer 33 and preventing diffusion, and is made of, for example, magnesium oxide.

[0036] The oxide superconducting layer 33 (hereinafter referred to as "superconducting layer 33") is a layer that exhibits superconductivity, and is made of, for example, an RE123-based (RE1Ba2Cu3O y ) is a superconducting thin film. RE is a rare earth element, such as Nd, Gd, Ho, Sm, or Y.

[0037] The protective layer 34 is a layer provided for the purpose of protecting the superconducting layer 33 from oxidation and the like, and is made of Ag or the like.

[0038] The stabilization layer 35 is provided for the purpose of shunting an excessive current when it flows through the superconducting layer 33 and preventing the superconducting layer from burning, and is made of, for example, Cu.

[0039] In addition, the strength of superconducting wire 30 in the wire thickness direction (direction perpendicular to the surface, direction of lamination 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). If cracks or delamination occur within superconducting layer 33, the superconducting properties will deteriorate.

[0040] According to the first embodiment, as described above, coil surface support members 40A, 40B that support superconducting coil 20 are provided on the upper and lower surfaces of superconducting coil 20, and face-to-face connection members 50 that mechanically connect coil surface support members 40A, 40B to each other are provided, and a configuration is adopted in which compressive stress is applied to the upper and lower surfaces of superconducting coil 20. This makes it possible to mechanically firmly support coil surface support members 40A, 40B and face-to-face connection members 50 in conjunction with superconducting coil 20. This makes it possible to prevent bending deformation from being introduced into superconducting coil 20 in the rotor radial direction due to centrifugal force or torque during operation. Furthermore, because the surface of superconducting coil 20 is continuously supported, it is possible to prevent bending strain from being introduced locally.

[0041] Furthermore, according to the first embodiment, as described above, the elastic modulus of the coil surface support members 40A, 40B is configured to be larger than the elastic modulus of the superconducting coil 20. This allows the coil surface support members 40A, 40B to apply a larger compressive stress to the superconducting coil 20 in the upper and lower surface directions (the wire width direction of the superconducting wire 30) when a centrifugal force acts on the superconducting coil 20 and the coil surface support members 40A, 40B, thereby mechanically and firmly supporting the coil surface support members 40A, 40B and the inter-face connection members 50 with the superconducting coil 20. This makes it possible to prevent bending deformation of the superconducting coil 20 in the rotor radial direction due to centrifugal force or torque during operation.

[0042] Furthermore, according to the first embodiment, as described above, the thermal expansion coefficients of the coil surface support members 40A, 40B and the surface-to-surface connection member 50 are configured to be larger than that of the superconducting coil 20. This means that the thermal contraction of the coil surface support members 40A, 40B is smaller than that of the surrounding members when cooled to the operating temperature. This allows isotropic compressive stress to act on the superconducting coil 20 from the coil surface support members 40A, 40B and the surface-to-surface connection member 50, thereby more firmly supporting the superconducting coil 20. This makes it possible to prevent bending deformation from being introduced into the superconducting coil 20 in the rotor radial direction due to centrifugal force or torque during operation. Furthermore, since the surface of the superconducting coil 20 is continuously supported, it is possible to prevent bending strain from being introduced locally.

[0043] Therefore, according to the first embodiment, it is possible to suppress deterioration of the characteristics of the superconducting wire 30 due to stress acting on the superconducting coil 20, and it is possible to provide a rotor 1 of a superconducting rotating electric machine and a superconducting rotating electric machine that maintain their integrity.

[0044] <Second embodiment> Next, a second embodiment will be described. In the following, the description of the parts common to the first embodiment will be omitted, and the description will focus on the parts different from the first embodiment.

[0045] Fig. 8 is an external view showing an example of the structure of the rotor 1 of the superconducting rotating electric machine according to the second embodiment. Fig. 9 is an external view showing a modified example of the structure shown in Fig. 8.

[0046] The rotor 1 according to this second embodiment differs from the rotor 1 according to the first embodiment described above in that at least a portion of the coil surface support member 40A or the coil surface support member 40B has an area that does not cover the surface of the superconducting coil 20.

[0047] 8, coil surface support member 40A and coil surface support member 40B each have an area 41 at the center in the rotor axial direction that does not cover the surface of superconducting coil 20. In this case, coil surface support member 40A may be divided into multiple members. Coil surface support member 40B may be divided into multiple members.

[0048] 9, each of coil surface support member 40A and coil surface support member 40B has a plurality of holes 42 as regions that do not cover the surface of superconducting coil 20. The plurality of holes 42 may be formed by removing material by drilling or the like.

[0049] In addition to the examples of FIGS. 8 and 9, other configurations may be employed as long as at least a portion of coil surface supporting member 40A or coil surface supporting member 40B has an area that does not cover the surface of superconducting coil 20.

[0050] According to the second embodiment, as described above, by configuring at least a portion of the coil surface support member 40A or the coil surface support member 40B to have an area that does not cover the surface of the superconducting coil 20, it is possible to secure space for arranging electrode parts that connect the superconducting coils 20 and cooling members for cooling them to operating temperature, and it is also possible to reduce the volume and weight of the coil surface support members 40A and 40B.

[0051] Therefore, according to the second embodiment, in addition to obtaining the same effects as the first embodiment, it is expected that the manufacturability of the rotor 1 will be improved and the power density will be improved due to the weight reduction.

[0052] <Third embodiment> Next, a third embodiment will be described. In the following, the description of the parts common to the first embodiment will be omitted, and the description will focus on the parts different from the first embodiment.

[0053] Fig. 10 is a cross-sectional view showing an example of the structure of a rotor of a superconducting rotating electric machine according to Embodiment 3. Fig. 11 is a cross-sectional view showing a modified example of the structure shown in Fig. 10.

[0054] The rotor 1 according to this third embodiment differs from the rotor 1 according to the first embodiment described above in that the coil surface support member 40A or the coil surface support member 40B is configured so as not to have a uniform thickness.

[0055] In the example of FIG. 10, the coil surface support member 40A is configured to have a tapered thickness distribution such that the thickness is increased on the outer peripheral surface side.

[0056] In the example of FIG. 11, the coil surface support member 40A is configured to have a shape with a part removed so as to be concentric with the central axis of the rotor 1.

[0057] 10 and 11, other configurations may be adopted as long as the thickness of the coil surface support member 40A or the coil surface support member 40B is not uniform. For example, not only the thickness of the coil surface support member 40A but also the thickness of the coil surface support member 40B may be configured to be not uniform.

[0058] According to the third embodiment, by configuring the thickness of the coil surface support member 40A or the coil surface support member 40B to be non-uniform as described above, the superconducting coil 20 can be mechanically and firmly supported by the coil surface support members 40A and 40B in areas of the superconducting coil 20 that have low structural strength or areas that are subjected to large mechanical loads during operation. This makes it possible to prevent bending deformation of the superconducting coil 20 in the rotor radial direction due to centrifugal force or torque during operation. Furthermore, the volume of the coil surface support members 40A and 40B can be reduced, and the superconducting coil 20 can be brought relatively closer to the rotor of the superconducting rotating electric machine.

[0059] Therefore, according to the third embodiment, it is possible to further suppress deterioration of the characteristics of the superconducting wire 30 due to stress acting on the superconducting coil 20, and to provide a rotor 1 for a superconducting rotating electric machine and a superconducting rotating electric machine that maintain soundness. Furthermore, the weight is reduced and the electrical interaction between the rotor 1 and the armature is strengthened, which is expected to improve the power density.

[0060] <Fourth embodiment> Next, a fourth embodiment will be described. In the following, the description of the parts common to the first embodiment will be omitted, and the description will focus on the parts different from the first embodiment.

[0061] Fig. 12 is a cross-sectional view showing an example of the structure of a rotor of a superconducting rotating electric machine according to a fourth embodiment. Fig. 13 is a cross-sectional view showing a modified example of the structure shown in Fig. 12. Fig. 14 is an enlarged view showing a main part of Fig. 13.

[0062] The rotor 1 according to the fourth embodiment differs from the rotor 1 according to the first embodiment in that the surface-to-surface connecting member 50 is configured to mechanically connect the coil surface support members 40A, 40B not only on the outer circumferential side or the inner circumferential side of the superconducting coil 20 but also on both the outer circumferential side and the inner circumferential side of the superconducting coil 20. Here, the surface-to-surface connecting member that mechanically connects the coil surface support members 40A, 40B on the outer circumferential side of the superconducting coil 20 is referred to as the surface-to-surface connecting member 50A (or the first surface-to-surface connecting member 50A), and the surface-to-surface connecting member that mechanically connects the coil surface support members 40A, 40B on the inner circumferential side of the superconducting coil 20 is referred to as the surface-to-surface connecting member 50B (or the second surface-to-surface connecting member 50B). It is desirable that the surface-to-surface connecting members 50A, 50B shown in FIG. 12 be configured to be in surface contact with the superconducting coil 20. Furthermore, it is desirable that the elastic modulus of each of inter-surface connecting members 50A, 50B is configured to be smaller than the elastic modulus of superconducting coil 20.

[0063] The surface-to-surface connecting members 50A, 50B may be configured using members of different materials and sizes on the outer and inner sides of the superconducting coil 20, or may be configured using members of the same material and size, as long as they can be mechanically fixed to the coil surface supporting members 40A, 40B. Furthermore, the surface-to-surface connecting members 50A, 50B may be mechanically fixed to the coil surface supporting members 40A, 40B using different methods on the outer and inner sides of the superconducting coil 20, or may be mechanically fixed to the coil surface supporting members 40A, 40B using the same method. In other words, any material, size, or method may be used for the coil surface supporting members 40A, 40B, as long as they can be mechanically connected to the surface-to-surface connecting members 50A, 50B on both the outer and inner sides of the superconducting coil 20.

[0064] Furthermore, for dimensional adjustment and the like, the surface-to-surface connecting members 50A, 50B may be configured to have matching portions 60 that are in surface contact with the coil surface support member 40A and the outer peripheral surface of the superconducting coil 20, respectively, or that are in surface contact with the coil surface support member 40B and the inner peripheral surface of the superconducting coil 20, respectively, as shown in FIGS. 13 and 14 . The examples shown in FIGS. 13 and 14 show examples in which the matching portions 60 are provided on both the outer and inner peripheral sides of the superconducting coil 20. The matching portions 60 may be configured as part of the coil surface support member 40A or 40B, or may be a separate member joined to the coil surface support member 40A or 40B. Alternatively, the superconducting coil 20 may be bonded to at least one surface of the surface-to-surface connecting members 50A, 50B by applying a thermosetting resin such as a phenol resin, a urea resin, or a melamine resin to at least one surface of the surface-to-surface connecting members 50A, 50B as the matching portions 60. Furthermore, matching section 60 may be processed by machining or the like so that the contact surface with superconducting coil 20 has a height that matches the height of the inner or outer peripheral surface of superconducting coil 20. Note that the height here means the length of superconducting coil 20 in the direction of the winding axis.

[0065] Matching section 60 may be constructed using materials and methods other than those described above, as long as it is in surface contact with the outer or inner surface of superconducting coil 20 .

[0066] According to the fourth embodiment, as described above, by configuring the surface-to-surface connecting members 50A, 50B to mechanically connect the coil surface support members 40A, 40B on both the outer and inner circumferential sides, the superconducting coil 20 can be supported from both the outer and inner circumferential sides by the surface-to-surface connecting members 50A, 50B and the coil surface support members 40A, 40B. This allows for more robust mechanical support than the single-end support shown in the first to third embodiments. This prevents bending deformation of the superconducting coil 20 in the rotor radial direction due to centrifugal force or torque during operation. Furthermore, since the surface of the superconducting coil 20 is continuously supported, it is possible to prevent bending strain from being locally introduced.

[0067] Furthermore, according to the fourth embodiment, as described above, the face-to-face connecting members 50A, 50B are configured to have matching portions 60 that are in face-to-face contact with the coil surface support member 40A and the outer peripheral surface of the superconducting coil 20, or that are in face-to-face contact with the coil surface support member 40B and the inner peripheral surface of the superconducting coil 20. This makes it possible to suppress deformation of the superconducting coil 20 in the outer circumferential direction due to electromagnetic forces acting on the superconducting coil 20 during operation, and also to prevent the superconducting coil 20 from being displaced relative to the face-to-face connecting members 50A, 50B and the coil surface support members 40A, 40B due to centrifugal force or torque caused by rotation, thereby suppressing damage to the superconducting coil 20 due to localized collision with the face-to-face connecting members 50A, 50B or the coil surface support members 40A, 40B caused by vibration.

[0068] Furthermore, according to the fourth embodiment, as described above, the elastic modulus of each of the surface-to-surface connection members 50A, 50B is configured to be smaller than the elastic modulus of the superconducting coil 20. Therefore, when stress occurs at the interface between the superconducting coil 20 and the surface-to-surface connection members 50A, 50B during operation, strain is preferentially generated in the surface-to-surface connection members 50A, 50B, preventing strain from being generated in the superconducting coil 20 and preventing local bending strain from being introduced into the superconducting wire 30.

[0069] Therefore, according to the fourth embodiment, in addition to obtaining the same effects as those of the first embodiment, the bending stress acting on the superconducting coil 20 due to centrifugal force and torque during operation can be further reduced, and the introduction of bending strain locally in the superconducting coil 20 can be prevented, so that deterioration of the characteristics of the superconducting wire 30 due to the stress acting on the superconducting coil 20 can be further suppressed, and a rotor 1 of a superconducting rotating electric machine and a superconducting rotating electric machine that are more soundly maintained can be provided.

[0070] As described above in detail, according to the embodiment, it is possible to suppress the deterioration of the characteristics of the superconducting wire due to the local strain introduced into the superconducting coil.

[0071] Although several 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 novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0072] 1...rotor, 10...winding mounting shaft, 13...support ring, 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...high-temperature superconducting wire (superconducting wire), 31...metal substrate, 32...intermediate layer, 33...oxide superconducting layer, 34...protective layer, 35...stabilizing coating layer, 40A...first coil surface support member, 40B...second coil surface support member, 41...area not covering the coil surface, 42...area not covering the coil surface (hole), 50...interface connecting member, 50A...first interface connecting member, 50B...second interface connecting member, 60...matching portion, 70A, 70B...screws.

Claims

1. a winding mounting shaft; a superconducting coil disposed around the winding mounting shaft; a first coil surface support member that presses the surface of the superconducting coil on the outer diameter side of the rotor; a second coil surface support member that presses the surface of the superconducting coil on the inner diameter side of the rotor; an inter-surface connecting member that mechanically connects the first coil surface support member and the second coil surface support member; A rotor for a superconducting rotating electric machine comprising:

2. the elastic modulus of each of the first coil surface support member and the second coil surface support member is greater than the elastic modulus of the superconducting coil; 2. The rotor of a superconducting rotating electric machine according to claim 1.

3. a thermal expansion coefficient of each of the first coil surface support member and the second coil surface support member is greater than a thermal expansion coefficient of the superconducting coil; 2. The rotor of a superconducting rotating electric machine according to claim 1.

4. the thermal expansion coefficient of the inter-surface connecting member is greater than the thermal expansion coefficient of the superconducting coil; 2. The rotor of a superconducting rotating electric machine according to claim 1.

5. At least a part of the first coil surface support member or the second coil surface support member has an area that does not cover the superconducting coil surface.

2. The rotor of a superconducting rotating electric machine according to claim 1.

6. The first coil surface support member or the second coil surface support member is configured to have a non-uniform thickness.

2. The rotor of a superconducting rotating electric machine according to claim 1.

7. The inter-surface connecting member is a first inter-surface connecting member that mechanically connects the first coil surface supporting member and the second coil surface supporting member on the outer periphery side of the superconducting coil; a second inter-surface connecting member that mechanically connects the first coil surface supporting member and the second coil surface supporting member on the inner circumferential side of the superconducting coil; Including, 2. The rotor of a superconducting rotating electric machine according to claim 1.

8. The inter-surface connecting member is a matching portion that is in surface contact with the first coil surface support member and an outer peripheral surface of the superconducting coil, respectively, or that is in surface contact with the second coil surface support member and an inner peripheral surface of the superconducting coil, 8. The rotor of a superconducting rotating electric machine according to claim 7.

9. the elastic modulus of each of the first coil surface support member and the second coil surface support member is smaller than the elastic modulus of the superconducting coil; 8. The rotor of a superconducting rotating electric machine according to claim 7.

10. A rotor for a superconducting rotating electric machine according to any one of claims 1 to 9, Superconducting rotating motor.

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