Rotor of a superconducting rotating electric machine and superconducting rotating electric machine

Abstract

To make it possible to suppress characteristic deterioration of a superconducting wire due to a stress acting on a superconducting coil.SOLUTION: A rotor of a superconducting rotary electric machine according to an embodiment of the present invention comprises: superconducting coils mounted on each part of a winding mounting shaft arranged around a rotor core; a resin layer for mechanically fixing various components including at least the superconducting coil; and a mold-release agent layer arranged on at least part of the interface between the resin layer and the superconducting coil.SELECTED DRAWING: Figure 5

Description

[[Technical Field]]

[0001] Embodiments of the present invention relate to a rotor of a superconducting rotary electric machine and a superconducting rotary electric machine. [[Background Art]]

[0002] In a rotor of a superconducting rotary electric machine, superconducting coils are provided on respective parts of a winding mounting shaft arranged around a rotor core. The superconducting coils are electrically connected in series between the superconducting coils by inter-coil connecting conductors, and function as field coils when cooled to an operating temperature at which they enter a superconducting state. The superconducting coils are mechanically fixed, for example, by being housed in slots provided in each winding mounting shaft, then filling a gap between the slots and the superconducting coils with a thermosetting resin and performing an impregnation treatment. [[Prior Art Literature]] [[Patent Literature]]

[0003] [[Patent Literature 1]] Japanese Patent Laid-Open No. 2015-12199 [[Patent Literature 2]] Japanese Patent Laid-Open No. 59-041171 [[Patent Literature 3]] Japanese Patent Laid-Open No. 53-140510 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0004] When rotating, the rotor of a superconducting rotary electric machine receives torque in the circumferential direction relative to the central rotation axis, and receives centrifugal force in the outer diameter direction relative to the central rotation axis. At this time, a very large, time-varying force peculiar to a rotating body acts on the superconducting coils. Therefore, in order to prevent the superconducting coils from being subjected to vibration or relative displacement due to the force acting during rotation, it is desired to firmly fix the superconducting coils by the above-described resin impregnation treatment.

[0005] However, if the resin and the superconducting coil are integrated as a single structure, thermal stress due to the difference in thermal shrinkage rates between the components will act around the entire circumference of the superconducting coil during cooling. Furthermore, torque and centrifugal force act on the superconducting coil. Therefore, due to torque, compressive stress acts in the rotational direction and tensile stress acts in the reversal direction in the circumferential direction of the rotor, and due to centrifugal force, tensile stress acts in the inward direction and compressive stress acts in the outward direction in the radial direction of the rotation axis. These forces act in combination on the superconducting coil, potentially causing stress concentration areas. In particular, if tensile stress acts on the superconducting wire within the superconducting coil in the wire thickness direction (perpendicular to the surface), it acts as peeling stress on the superconducting wire, which can cause deterioration of the superconducting wire's properties and potentially impair the integrity of the rotor.

[0006] The problem that this invention aims to solve is to provide a rotor for a superconducting rotating electric machine and a superconducting rotating electric machine that can suppress the deterioration of the properties of superconducting wires due to stress acting on the superconducting coil. [Means for solving the problem]

[0007] The rotor of the superconducting rotating electric machine according to this embodiment is provided on various parts of the winding mounting shaft arranged around the rotor core. , including rare earth-based high-temperature superconducting wires A superconducting coil and a device provided around the superconducting coil, at least the superconducting coil The member comprises an inter-coil connecting conductor that electrically connects the superconducting coils in series, a feeder that electrically connects the superconducting coils to the outside of the machine, and a heat transfer member whose one end is thermally connected to the superconducting coil and whose other end is thermally connected to the winding mounting shaft, and the member including these A resin layer for mechanical fixation and the superconducting coil. , the inter-coil connecting conductor, the feeder, and the heat transfer member Provided around the resin layer 、 The superconducting coil , the inter-coil connecting conductor, the feeder, and the heat transfer member At the interface with The aforementioned Superconducting coil , the inter-coil connecting conductor, the feeder, and the outer surface of the heat transfer member It comprises a release agent layer formed to cover it. [Effects of the Invention]

[0008] According to the present invention, it is possible to suppress the deterioration of the properties of superconducting wire material due to stress acting on the superconducting coil. [Brief explanation of the drawing]

[0009] [Figure 1]Figure 1 is a cross-sectional view showing an example of the overall configuration of the rotor of a superconducting rotating electric machine according to the first embodiment. [Figure 2] Figure 2 is a cross-sectional view showing an example of the cross-sectional shape in section AA of the structure shown in Figure 1. [Figure 3] Figure 3 is a cross-sectional view showing an example of the cross-sectional shape of the BB section of the structure shown in Figure 1. [Figure 4] Figure 4 is a view showing an example of the shape of the structure shown in Figure 3 when viewed from the U direction. [Figure 5] Figure 5 is a cross-sectional view showing an example of the cross-sectional shape in a VV section of the structure shown in Figure 4. [Figure 6] Figure 6 is a cross-sectional view showing an example of the configuration of the superconducting wire 30 shown in Figure 5. [Figure 7] Figure 7 is a conceptual diagram showing the torque and centrifugal force acting on the superconducting coil 20 due to the rotation of the rotor 1 during operation, and their directions, in the structure shown in Figure 3. [Figure 8] Figure 8 is a conceptual diagram showing the torque and centrifugal force acting on the superconducting coil 20 due to the rotation of the rotor 1 during operation, and their directions, in the structure shown in Figure 4. [Figure 9] Figure 9 is a conceptual diagram showing the torque and centrifugal force acting on the superconducting coil 20 due to the rotation of the rotor 1 during operation, and their directions, in the structure shown in Figure 5. [Figure 10] Figure 10 is a conceptual diagram showing the torque and centrifugal force acting on the superconducting wire 30 in the superconducting coil 20 due to the rotation of the rotor 1 during operation, and their directions, in the structure shown in Figure 6. [Figure 11A] Figure 11A is a view along the arrow showing a first modified shape of the structure shown in Figure 3 when viewed from the U direction (i.e., a first modified shape of the structure shown in Figure 4). [Figure 11B] Figure 11B is an unfolded view showing the individual first modified superconducting coils 20 arranged circumferentially around the rotor 1. [Figure 12]FIG. 12 is a cross-sectional view illustrating a first modification of the cross-sectional shape along the W-W cross-section of the structure shown in FIG. 11 (that is, a first modification of the structure shown in FIG. 5). [Figure 13] FIG. 13 is an arrow view illustrating a second modification of the shape when the structure shown in FIG. 3 is viewed from the U direction (that is, a second modification of the structure shown in FIG. 4). [Figure 14] FIG. 14 is a cross-sectional view illustrating a second modification of the cross-sectional shape along the X-X cross-section of the structure shown in FIG. 13 (that is, a second modification of the structure shown in FIG. 5). MODE FOR CARRYING OUT THE INVENTION

[0010] Hereinafter, embodiments will be described with reference to the drawings.

[0011] <First Embodiment> First, a first embodiment will be described.

[0012] (Configuration of Rotor of Superconducting Rotating Electrical Machine) First, the basic structure of the rotor of the superconducting rotating electrical machine according to the first embodiment will be described with reference to FIGS. 1 to 3. Thereafter, a structure including characteristic portions of the first embodiment will be described with reference to FIGS. 4 and 5.

[0013] FIG. 1 is a cross-sectional view illustrating an example of the overall configuration of the rotor of the superconducting rotating electrical machine according to the first embodiment. FIG. 2 is a cross-sectional view illustrating an example of a cross-sectional shape along the A-A cross-section of the structure shown in FIG. 1. FIG. 3 is a cross-sectional view illustrating an example of a cross-sectional shape along the B-B cross-section of the structure shown in FIG. 1.

[0014] The rotor 1 of the superconducting rotating electrical machine shown in FIGS. 1 to 3 includes a rotor core 11, a refrigerant flow path 12, a winding mounting shaft 13, a support ring 14, a torque tube 15, a vacuum vessel 16, a rotating shaft 17, a bearing 18, a superconducting coil 20, a feeder 25, a heat transfer member 26, a resin layer 40A, and the like.

[0015] Although not shown in Figures 1 to 3, a mold release agent layer 50, which will be described later, is provided at least a portion of the interface between the resin layer 40A and the superconducting coil 20.

[0016] The rotor core 11 is provided with a refrigerant channel 12 through which a refrigerant introduced from outside the machine flows. The refrigerant cools the inside of the machine as it flows through the rotor core 11 via the refrigerant channel 12. Around the rotor core 11, a winding mounting shaft 13 is arranged for mounting superconducting coils 20 at regular intervals in the circumferential direction, and the superconducting coils 20 are positioned on various parts of the winding mounting shaft 13. Inter-coil connecting conductors 23 are attached between the superconducting coils 20, and each inter-coil connecting conductor 23 electrically connects the individual superconducting coils 20 in series. Furthermore, a support ring 14 is provided around the winding mounting shaft 13, and torque tubes 15 are provided at both axial ends of the support ring 14.

[0017] Each superconducting coil 20 is arranged so as to be point-symmetric with respect to the rotor's axis. Figures 1 to 3 show an example with four superconducting coils 20, but the number of superconducting coils is not limited to this example. There is no limit to the number of superconducting coils, as long as two or more are arranged so as to be point-symmetric.

[0018] The vacuum chamber 16 houses the rotor core 11, winding mounting shaft 13, support ring 14, and torque tube 15 described above. Rotating shafts 17 are connected to both axial ends of the vacuum chamber 16, and the rotating shafts 17 are mounted on bearings 18.

[0019] A feeder 25 is connected to a portion of the superconducting coil 20. Additionally, a heat transfer element 26 is attached to each individual superconducting coil 20. A resin layer 40A is provided around them.

[0020] In the example shown in Figure 3, one heat transfer member 26 is thermally connected to each superconducting coil 20. However, this is not limited to this example; one heat transfer member 26 may be thermally connected to multiple superconducting coils 20, or conversely, multiple heat transfer members 26 may be thermally connected to one superconducting coil 20. Furthermore, the location and area of ​​the surface portion to which the heat transfer member 26 is connected on the entire surface of the superconducting coil 20 may be changed as appropriate.

[0021] The torque tube 15 mechanically connects the rotor core 11, winding mounting shaft 13, and support ring 14 to the vacuum vessel 16 as a single unit, and supports each of them. The vacuum vessel 16 is mechanically connected to the rotating shaft 17, which is supported by bearings 18.

[0022] The feeder 25 is made of a conductive material and electrically connects the superconducting coils 20 at both ends to the outside of the machine, serving as the electrical path when current is supplied to the superconducting coils 20 from the outside of the machine.

[0023] In the example shown in Figure 1, the feeder 25 is connected to the outside of the machine from the outer or back side of the superconducting coil 20. However, the feeder 25 may also be connected to the outside of the machine from the inner side of the superconducting coil 20, or from the front side of the superconducting coil 20.

[0024] The resin layer 40A is a layer made of a thermosetting resin such as melamine resin, urea resin, epoxy resin, silicone resin, or phenolic resin. This resin layer 40A mechanically fixes various components arranged around the winding mounting shaft 13, namely the superconducting coil 20, the inter-coil connecting conductor 23, the feeder 25, and the heat transfer member 26. The resin layer 40A also functions as a heat transfer path between the winding mounting shaft 13 and these components, guiding the heat generated in the superconducting coil 20, the inter-coil connecting conductor 23, the feeder 25, etc., when current is applied to the winding mounting shaft 13.

[0025] (Superconducting coil 20 and its surrounding components) Figure 4 is a view showing an example of the shape of the structure shown in Figure 3 when viewed from the U direction. Figure 5 is a cross-sectional view showing an example of the cross-sectional shape of the structure shown in Figure 4 in a VV section.

[0026] As shown in Figures 4 and 5, the superconducting coil 20 is formed by winding, for example, a high-temperature superconducting wire 30 (hereinafter referred to as "superconducting wire 30") and insulating tape 27 in a spiral shape around a winding frame 21 (including the coil lead electrode 24), with insulating plates 22 placed on the upper and lower surfaces of the resulting winding portion, and a resin layer 40B being filled and impregnated between the insulating plates 22 on these upper and lower surfaces and the winding portion (superconducting wire 30 and insulating tape 27).

[0027] The insulating plate 22 is formed from, for example, insulating films such as polyimide, polyester polyurethane, polyamide, polyamide-imide, and polyvinyl formal; thermosetting resins such as phenolic resin, urea resin, and melamine resin; glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP), thereby improving the insulating protection and mechanical strength of the coil winding section.

[0028] The heat transfer member 26 is made of a material with good thermal conductivity, with one end thermally connected to the superconducting coil 20 and the other end thermally connected to the winding mounting shaft 13. When the rotor core 11 is cooled via the coolant in the coolant flow path 12, the winding mounting shaft 13 is cooled via the cooled rotor core 11, and the superconducting coil 20 is further cooled by conduction from the winding mounting shaft 13 via the heat transfer member 26.

[0029] The inter-coil connecting conductors 23 are made of a conductive material and electrically connect two neighboring superconducting coils 20 together. The ends of the inter-coil connecting conductors 23 are connected, for example, to the coil lead electrodes 24 of the superconducting coils 20. By having each inter-coil connecting conductor 23 make a similar connection, all the superconducting coils 20 are electrically connected in series.

[0030] In the example shown in Figure 5, the inter-coil connecting conductor 23 connects the two superconducting coils 20 on the inner circumference side (the lower surface of the superconducting coils 20). However, the example is not limited to this; for example, the connection could also be made on the outer circumference side (the upper surface of the superconducting coils 20).

[0031] In this embodiment, a release agent layer 50 is further provided on at least a portion of the interface between the resin layer 40A and the superconducting coil 20. For example, as shown in Figures 4 and 5, the release agent layer 50 is formed to cover at least a portion of the surface of the superconducting coil 20 at the interface between the resin layer 40A and the superconducting coil 20. This release agent layer 50 is a layer that has been treated to weaken the adhesive force with the resin layer 40A or to prevent adhesion with the resin layer 40A to at least a portion of the surface of the superconducting coil 20. As a result, the surface of the superconducting coil 20 has weak adhesive force with the resin layer 40A, and a gap may be created between it and the resin layer 40A.

[0032] The release agent layer 50 may be formed by adhering or applying a release agent to the surface of the superconducting coil 20. For example, it may be formed by adhering a fluororesin tape or the like to the surface of the superconducting coil 20, or by applying paraffin, grease, silicone oil, or a fluorine compound. Furthermore, it is not limited to these examples, and any other method may be used to form a layer that weakens the adhesive strength with the resin layer 40A or prevents adhesion with the resin layer 40A.

[0033] The resin layer 40A is formed by filling and impregnating the winding mounting shaft 13 with thermosetting resin so that no gaps are created between the winding mounting shaft 13 and the various components arranged around the winding mounting shaft 13, namely the release agent layer 50 covering the surface of the superconducting coil 20, the inter-coil connecting conductor 23, the heat transfer member 26, and the feeder 25 (not shown in Figure 5), thereby mechanically fixing the superconducting coil 20.

[0034] With this configuration, the resin layer 40A suppresses the relative displacement of the various components arranged around the winding mounting shaft 13 during rotation, while the release agent layer 50 suppresses the tensile stress acting between the resin layer 40B and the superconducting wire 30, thereby suppressing the peeling stress acting on the superconducting wire 30 and preventing deterioration of the properties of the superconducting wire 30.

[0035] (Composition of superconducting wire 30) Figure 6 shows an example of the configuration of the superconducting wire 30 shown in Figure 5.

[0036] The superconducting wire 30 is composed of a thin-film multilayer wire in which a stabilizing layer 35 is applied to a multilayer film 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.

[0037] The tape-shaped metal substrate 31 is formed from, for example, stainless steel or a nickel-based alloy such as Hastelloy (registered trademark).

[0038] 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 formed from, for example, magnesium oxide.

[0039] The oxide superconducting layer 33 is a layer that exhibits superconductivity (hereinafter referred to as the "superconducting layer"), for example, the RE123 system (RE1Ba2Cu3O y This is a superconducting thin film having ). RE is a rare earth element, such as Nd, Gd, Ho, Sm, or Y.

[0040] The protective layer 34 is a layer provided for the purpose of protecting the superconducting layer from oxidation, etc., and is formed from Ag or the like.

[0041] The stabilization layer 35 is provided to divert excess current when it flows through the superconducting layer, thereby preventing the superconducting layer from burning, and is made of, for example, copper.

[0042] Furthermore, the superconducting wire 30 has a strength in the wire thickness direction (perpendicular to the plane, direction of thin film lamination) that is an order of magnitude smaller than its strength in the wire width direction and longitudinal direction (in-plane direction). If cracks occur within the superconducting layer or delamination occurs, the superconducting properties will deteriorate.

[0043] (Force acting on rotor 1) Next, with reference to Figures 7 to 10, the torque, centrifugal force, and various stresses acting on the superconducting coil 20 during the operation of the rotor 1 will be explained.

[0044] Figure 7 is a conceptual diagram showing the torque and centrifugal force acting on the superconducting coil 20 due to rotation during operation of the rotor 1 in the structure shown in Figure 3, and their directions. Figure 8 is a conceptual diagram showing the torque and centrifugal force acting on the superconducting coil 20 due to rotation during operation of the rotor 1 in the structure shown in Figure 4, and their directions. Figure 9 is a conceptual diagram showing the torque and centrifugal force acting on the superconducting coil 20 due to rotation during operation of the rotor 1 in the structure shown in Figure 5, and their directions. Figure 10 is a conceptual diagram showing the torque and centrifugal force acting on the superconducting wire 30 within the superconducting coil 20 due to rotation during operation of the rotor 1 in the structure shown in Figure 6, and their directions.

[0045] As shown in Figures 7 to 10, the superconducting coil 20 and superconducting wire 30 are subjected to centrifugal force F and torque T due to the rotation R during the operation of the rotor 1.

[0046] On the other hand, during the operation of rotor 1, thermal stress due to cooling acts on the entire circumference of the superconducting coil 20 (specifically, stress acts on the superconducting wire 30 within the superconducting coil 20 in both the in-plane and perpendicular directions, and tensile or compressive stress acts in each direction due to the difference in thermal shrinkage rates of the surrounding resin and structure).

[0047] In addition, during operation of the rotor 1, the torque T acts on the rotor 1 in the circumferential direction, causing compressive stress in the rotational direction and tensile stress in the reversal direction (specifically, compressive stress in the rotational direction and tensile stress in the reversal direction on the outermost and innermost circumferential surfaces of the superconducting coil 20, and tensile and compressive stress perpendicular to the plane on the superconducting wire 30 inside the superconducting coil 20). Furthermore, the centrifugal force F acts on the rotational axis in the radial direction, causing tensile stress in the inward direction and compressive stress in the outward direction (specifically, compressive stress on the upper surface of the superconducting coil 20, tensile stress on the lower surface, and tensile and compressive stress in the in-plane direction on the superconducting wire 30 inside the superconducting coil 20).

[0048] If no countermeasures are taken, these forces will act in combination on the superconducting coil 20, which is surface-constrained by the resin layer 40A, potentially causing localized stress concentrations in the superconducting coil 20. When stress concentrations occur, the coil may deform locally at those points. If the coil deforms locally, stress concentrations will also occur on the superconducting wire 30, resulting in forces with various directional components acting on it. In particular, if tensile stress acts between the resin layer 40B and the surface of the superconducting wire 30, and a force with a directional component that results in tensile stress perpendicular to the surface acts on the superconducting wire 30, this can act as peeling stress on the superconducting wire 30, potentially causing degradation of its properties. If the properties of the superconducting wire 30 degrade even locally, the superconducting coil 20, which is constructed by winding the superconducting wire 30, will not be able to function properly, and as a result, the rotor 1 will not function, rendering the superconducting rotating electric machine inoperable.

[0049] In contrast, in this embodiment, as described above, a release agent layer 50 is provided on at least a portion of the surface of the superconducting coil 20 to weaken the adhesive force with the resin layer 40A or to prevent adhesion with the resin layer 40A. For example, as shown in Figures 8 and 9, the release agent layer 50 is formed to cover at least a portion of the surface of the superconducting coil 20 at the interface between the resin layer 40A and the superconducting coil 20, thereby solving the above-mentioned problems.

[0050] In other words, the release agent layer 50 acts to weaken the adhesive force between the surface of the superconducting coil 20 and the resin layer 40A, or to prevent the surface of the superconducting coil 20 from adhering to the resin layer 40A. That is, the surface of the superconducting coil 20 has weak adhesive force with the resin layer 40A, and a gap may form between it and the resin layer 40A. Therefore, the tensile stress acting between the resin layer 40B and the superconducting wire 30 during the operation of the rotor 1 is suppressed, the occurrence of localized stress concentrations in the superconducting coil 20 is suppressed, and localized deformation of the coil becomes less likely. Furthermore, because localized deformation of the coil becomes less likely, the occurrence of stress concentrations in the superconducting wire 30 is also suppressed, the tensile stress acting perpendicular to the surface of the superconducting wire 30 is suppressed, the peeling stress acting on the superconducting wire 30 is suppressed, and the deterioration of the properties of the superconducting wire 30 due to peeling stress is suppressed.

[0051] According to the first embodiment, since a mold release agent layer 50 is formed at the interface between the resin layer 40A and the superconducting coil 20, relative displacement during rotation of the superconducting coil 20 can be suppressed, while tensile stress acting between the resin layer 40B and the superconducting wire 30 can be suppressed, and peeling stress acting on the superconducting wire 30 can be suppressed. This prevents deterioration of the properties of the superconducting wire 30 due to peeling stress, and provides a rotor for a superconducting rotating electric machine that maintains its integrity.

[0052] <Second Embodiment> Next, a second embodiment will be described. In the following, the explanation of parts common to the first embodiment will be omitted, and the explanation will focus on the parts that differ from the first embodiment.

[0053] The basic structure of the rotor of the superconducting rotating electric machine according to the second embodiment is the same as that shown in Figures 1 to 3, so its explanation will be omitted.

[0054] The structure of the second embodiment, including its characteristic parts, will be described below with reference to Figures 11A, 11B, and 12.

[0055] Figure 11A is a view along the arrow showing a first modification of the shape of the structure shown in Figure 3 when viewed from the U direction (i.e., a first modification of the structure shown in Figure 4). Figure 11B is an unfolded view showing the individual superconducting coils 20 of the first modification arranged in the circumferential direction of the rotor 1. Figure 12 is a cross-sectional view showing a first modification of the cross-sectional shape of the structure shown in Figure 11A in the WW section (i.e., a first modification of the structure shown in Figure 5).

[0056] The difference between the rotor 1 according to this second embodiment and the rotor 1 according to the first embodiment described above is that the release agent layer 50 is also provided in at least a portion of the interface between the resin layer 40A and the inter-coil connecting conductor 23, and also in at least a portion of the interface between the resin layer 40A and the feeder 25.

[0057] For example, as shown in Figures 11A and 12, the release agent layer 50 is formed to cover the surface of the inter-coil connecting conductor 23 at the interface between the resin layer 40A and the inter-coil connecting conductor 23. Also, the release agent layer 50 is formed to cover the surface of the feeder 25 at the interface between the resin layer 40A and the feeder 25. For example, as shown in Figure 11B, the release agent layer 50 is formed to cover the surface of the feeder 25.

[0058] As a result, the release agent layer 50 acts to weaken the adhesive force between the surface of the inter-coil connecting conductor 23 and the resin layer 40A, or to prevent the surface of the inter-coil connecting conductor 23 from adhering to the resin layer 40A, and also to weaken the adhesive force between the surface of the feeder 25 and the resin layer 40A, or to prevent the surface of the feeder 25 from adhering to the resin layer 40A. In other words, the surface of the inter-coil connecting conductor 23 and the surface of the feeder 25 have weak adhesive force with the resin layer 40A, and gaps may form between them and the resin layer 40A.

[0059] In the configuration of the first embodiment described above, the inter-coil connecting conductor 23 and the feeder 25 are firmly fixed to the resin layer 40A, while the surface of the superconducting coil 20 has weak adhesion to the resin layer 40A, creating a small gap between them. When the torque and centrifugal force due to the rotation of the rotor 1 act in combination, only the superconducting coil 20 may be displaced relatively by the amount of this small gap, but the inter-coil connecting conductor 23 and the feeder 25 are firmly bonded to the resin layer 40A, so their relative displacement is almost zero. Therefore, stress concentration may occur at the connection points between the superconducting coil 20 and the inter-coil connecting conductor 23 and the connection points with the feeder 25.

[0060] In contrast, in the second embodiment, when the torque and centrifugal force due to the rotation of the rotor 1 act in combination, even if the superconducting coil 20 is displaced relative to the resin layer 40A by a small gap, the inter-coil connecting conductor 23 and the feeder 25 are allowed to follow suit and displace relative to it. Therefore, the occurrence of stress concentration points at the connection between the superconducting coil 20 and the inter-coil connecting conductor 23 and the connection with the feeder 25 is suppressed.

[0061] According to the second embodiment, in addition to obtaining the same effects as the first embodiment, the release agent layer 50 is formed not only at the interface between the resin layer 40A and the superconducting coil 20, but also at the interface between the resin layer 40A and the inter-coil connecting conductor 23, and at the interface between the resin layer 40A and the feeder 25. As a result, the occurrence of stress concentration areas at the connection points between the superconducting coil 20 and the inter-coil connecting conductor 23 and the connection points with the feeder 25 is suppressed. This suppresses the occurrence of stress concentration areas in the superconducting coil 20 caused by such stress concentration areas, further suppresses the deterioration of characteristics due to peeling stress acting on the superconducting wire 30, and provides a rotor for a superconducting rotating electric machine that maintains greater integrity.

[0062] <Third Embodiment> Next, a third embodiment will be described. In the following, the description of parts common to the first and second embodiments will be omitted, and the focus will be on the parts that differ from the first and second embodiments.

[0063] The basic structure of the rotor of the superconducting rotating electric machine according to the third embodiment is the same as that shown in Figures 1 to 3, so its explanation will be omitted.

[0064] The structure of the third embodiment, including its characteristic parts, will be described below with reference to Figures 13 and 14.

[0065] Figure 13 is a view along the arrow showing a second modification of the shape of the structure shown in Figure 3 when viewed from the U direction (i.e., a second modification of the structure shown in Figure 4). Figure 14 is a cross-sectional view showing a second modification of the cross-sectional shape of the structure shown in Figure 13 at cross-section XX (i.e., a second modification of the structure shown in Figure 5).

[0066] The difference between the rotor 1 according to this third embodiment and the rotor 1 according to the second embodiment described above is that the release agent layer 50 is also provided on at least a portion of the interface between the resin layer 40A and the heat transfer member 26.

[0067] For example, as shown in Figures 13 and 14, the release agent layer 50 is formed to cover the surface of the heat transfer member 26 at the interface between the resin layer 40A and the heat transfer member 26.

[0068] As a result, the release agent layer 50 acts to weaken the adhesive force between the surface of the heat transfer member 26 and the resin layer 40A, or to prevent the surface of the inter-coil connecting conductor 23 from adhering to the resin layer 40A. In other words, the surface of the heat transfer member 26 has weak adhesion to the resin layer 40A, and a gap may form between it and the resin layer 40A.

[0069] In the configuration of the second embodiment described above, the heat transfer member 26 and the resin layer 40A are firmly fixed to each other, while the surfaces of the superconducting coil 20, the inter-coil connecting conductor 23, and the feeder 25 have weak adhesion to the resin layer 40A, creating a small gap between them. When the torque and centrifugal force due to the rotation of the rotor 1 act in combination, the superconducting coil 20, the inter-coil connecting conductor 23, and the feeder 25 may be displaced relative to each other by the amount of this small gap, but since the heat transfer member 26 is firmly bonded to the resin layer 40A, the relative displacement is almost zero. Therefore, a stress concentration area may occur at the connection between the superconducting coil 20 and the heat transfer member 26.

[0070] In contrast, in the third embodiment, when the torque and centrifugal force due to the rotation of the rotor 1 act in combination, even if the superconducting coil 20, the inter-coil connecting conductor 23, and the feeder 25 are displaced relative to each other by the amount of a small gap in the resin layer 40A, the heat transfer member 26 is also allowed to follow suit and displace relative to each other. Therefore, the occurrence of stress concentration at the connection between the superconducting coil 20 and the heat transfer member 26 is suppressed.

[0071] According to the third embodiment, in addition to obtaining the same effects as the second embodiment, the release agent layer 50 is also formed at the interface between the resin layer 40A and the heat transfer member 26. This suppresses the occurrence of stress concentration areas at the connection between the superconducting coil 20 and the heat transfer member 26. As a result, the occurrence of stress concentration areas in the superconducting coil 20 caused by these stress concentration areas can be suppressed, further suppressing the deterioration of properties due to peeling stress acting on the superconducting wire 30, and providing a rotor for a superconducting rotating electric machine that maintains greater integrity.

[0072] As detailed above, each embodiment makes it possible to suppress the deterioration of the properties of the superconducting wire due to stress acting on the superconducting coil.

[0073] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, modifications, and combinations are possible without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0074] 1...Rotor, 11...Rotor core, 12...Refrigerant flow path, 13...Winding mounting shaft, 14...Support ring, 15...Torque tube, 16...Vacuum vessel, 17...Rotating shaft, 18...Bearing, 20...Superconducting coil, 21...Winding frame, 22...Insulating plate, 23...Inter-coil connecting conductor, 24...Coil lead electrode, 25...Feeder, 26...Heat transfer component, 27...Insulating tape, 30...High-temperature superconducting wire (superconducting wire), 31...Metal substrate, 32...Intermediate layer, 33...Oxide superconducting layer, 34...Protective layer, 35...Stabilizing layer, 40A, 40B...Resin layer, 50...Release agent layer.

Claims

1. A superconducting coil containing rare-earth high-temperature superconducting wire material is provided at each part of the winding mounting shaft arranged around the rotor core, Provided around the superconducting coil, at least, The superconducting coil and, The superconducting coils are electrically connected in series by an inter-coil connecting conductor, A feeder that electrically connects the superconducting coil to the outside of the machine, A heat transfer member having one end thermally connected to the superconducting coil and the other end thermally connected to the winding mounting shaft, It consists of, A resin layer that mechanically fixes these components, The superconducting coil, the inter-coil connecting conductor, the feeder, and the heat transfer member are provided around them. At the interface between the resin layer, the superconducting coil, the inter-coil connecting conductor, the feeder, and the heat transfer member The superconducting coil, the inter-coil connecting conductor, the feeder, and the release agent layer formed to cover the outer surface of the heat transfer member, A rotor for a superconducting rotating electric machine.

2. The aforementioned release agent layer is The superconducting coil, the inter-coil connecting conductor, the feeder, and the outer surface of the heat transfer member are treated to weaken the adhesive force with the resin layer or to prevent adhesion with the resin layer. The rotor of the superconducting rotating electric machine according to claim 1.

3. The aforementioned release agent layer is The layer is formed by bonding or applying a release agent to the outer surface of the superconducting coil, the inter-coil connecting conductor, the feeder, and the heat transfer member. The rotor of the superconducting rotating electric machine according to claim 1.

4. A superconducting rotating electric machine configured using the rotor of a superconducting rotating electric machine according to any one of claims 1 to 3.

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