JP2024039332A - Rotor of superconducting rotary electric machine, and superconducting rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: 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

COPYRIGHT: (C)2024,JPO&INPIT

Description

Embodiments of the present invention relate to a rotor of a superconducting rotating electric machine and a superconducting rotating electric machine.

In a rotor of a superconducting rotating electric machine, superconducting coils are provided at each part of a winding attachment shaft arranged around a rotor core. The superconducting coils function as field coils by electrically connecting the superconducting coils in series through an inter-coil connecting conductor and cooling the superconducting coils to an operating temperature at which they become superconducting. This superconducting coil is mechanically fixed by, for example, being placed in a slot provided on each winding mounting shaft, and then filling the gap between the slot and the superconducting coil with a thermosetting resin and performing an impregnation process. Ru.

JP 2015-12199 Publication Japanese Patent Application Publication No. 59-041171 Japanese Unexamined Patent Publication No. 53-140510

The rotor of a superconducting rotating electrical machine receives torque in the circumferential direction relative to the rotational center axis during rotation, and receives centrifugal force in the outer radial direction relative to the rotational center axis. At this time, an extremely large and time-varying force unique to a rotating body acts on the superconducting coil. Therefore, in order to prevent the superconducting coil from being subjected to vibration or relative displacement due to the force exerted during rotation, it is desirable to firmly fix the superconducting coil through the resin impregnation treatment described above. There is.

However, when the resin and the superconducting coil are integrated as a structure, thermal stress due to the difference in thermal contraction rate between the members acts on the entire periphery of the superconducting coil during cooling. Additionally, torque and centrifugal force act on the superconducting coil. Therefore, due to torque, compressive stress acts in the rotation direction and tensile stress acts in the reverse direction in the circumferential direction of the rotor, and centrifugal force causes tensile stress in the inner radial direction and compressive stress in the outer radial direction in the radial direction of the rotating shaft. These forces may act in combination on the superconducting coil, creating a stress concentration area. In particular, when tensile stress acts on the superconducting wire in the superconducting coil in the wire thickness direction (perpendicular to the plane), it acts as peeling stress on the superconducting wire, resulting in deterioration of the characteristics of the superconducting wire and the rotor. The integrity of the system may be damaged.

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 characteristics of a superconducting wire due to stress acting on a superconducting coil.

The rotor of the superconducting rotating electrical machine according to the embodiment includes: a superconducting coil provided at each part of a winding attachment shaft arranged around a rotor core; a resin layer mechanically fixing various members including at least the superconducting coil; A mold release agent layer is provided on at least a portion of the interface between the resin layer and the superconducting coil.

According to the present invention, it is possible to suppress deterioration of characteristics of a superconducting wire due to stress acting on a superconducting coil.

FIG. 1 is a sectional view showing an example of the overall configuration of a rotor of a superconducting rotating electrical machine according to a first embodiment. 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. FIG. 3 is a cross-sectional view showing an example of the cross-sectional shape of the structure shown in FIG. 1 taken along the line BB. FIG. 4 is an arrow view showing an example of the shape of the structure shown in FIG. 3 when viewed from the U direction. FIG. 5 is a cross-sectional view showing an example of the cross-sectional shape of the structure shown in FIG. 4 taken along the line VV. FIG. 6 is a cross-sectional view showing an example of the configuration of the superconducting wire 30 shown in FIG. 5. FIG. 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 FIG. 3, and the directions thereof. FIG. 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 and their directions in the structure shown in FIG. 4. FIG. 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 FIG. 5, and the directions thereof. FIG. 10 is a conceptual diagram showing the torque and centrifugal force acting on the superconducting wire 30 in the superconducting coil 20 due to rotation during operation of the rotor 1 in the structure shown in FIG. 6, as well as their directions. FIG. 11A is an arrow view showing a first modified example of the shape of the structure shown in FIG. 3 when viewed from the U direction (that is, a first modified example of the structure shown in FIG. 4). FIG. 11B is a development view showing the individual superconducting coils 20 of the first modified example arranged in the circumferential direction of the rotor 1 . FIG. 12 is a cross-sectional view showing a first modification of the cross-sectional shape of the structure shown in FIG. 11 taken along the line WW (that is, a first modification of the structure shown in FIG. 5). FIG. 13 is a view showing a second modification of the shape of the structure shown in FIG. 3 when viewed from the U direction (that is, a second modification of the structure shown in FIG. 4). FIG. 14 is a cross-sectional view showing a second modification of the cross-sectional shape of the structure shown in FIG. 13 (ie, a second modification of the structure shown in FIG. 5).

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

<First embodiment>
First, a first embodiment will be described.

(Configuration of rotor of superconducting rotating electric machine)
First, the basic structure of the rotor of the superconducting rotating electrical machine according to the first embodiment will be explained with reference to FIGS. 1 to 3. Thereafter, a structure including characteristic parts of the first embodiment will be described with reference to FIGS. 4 and 5.

FIG. 1 is a sectional view showing an example of the overall configuration of a rotor of a superconducting rotating electrical machine according to a first embodiment. 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. FIG. 3 is a cross-sectional view showing an example of the cross-sectional shape of the structure shown in FIG. 1 taken along the line BB.

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

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

The rotor core 11 is provided with a refrigerant passage 12 through which a refrigerant introduced from outside the machine flows. The refrigerant cools the inside of the machine while flowing through the rotor core 11 through the refrigerant flow path 12. A winding attachment shaft 13 for attaching superconducting coils 20 at regular intervals in the circumferential direction is arranged around the rotor core 11, and superconducting coils 20 are arranged at each part of the winding attachment shaft 13. An inter-coil connection conductor 23 is attached between the superconducting coils 20, and each inter-coil connection conductor 23 electrically connects the individual superconducting coils 20 in series. Furthermore, a support ring 14 is provided around the winding attachment shaft 13, and torque tubes 15 are provided at both ends of the support ring 14 in the axial direction.

The individual superconducting coils 20 are arranged point-symmetrically with respect to the axial center of the rotor. Note that although FIGS. 1 to 3 show an example in which four superconducting coils 20 are arranged, the number of superconducting coils is not limited to this example. As long as two or more superconducting coils are arranged point-symmetrically, there is no limit to the number.

The rotor core 11, winding attachment shaft 13, support ring 14, and torque tube 15 described above are housed in the vacuum container 16. A rotating shaft 17 is connected to both ends of the vacuum container 16 in the axial direction, and the rotating shaft 17 is attached to a bearing 18 .

A feeder 25 is connected to a part of the superconducting coil 20. Furthermore, a heat transfer member 26 is attached to each superconducting coil 20. A resin layer 40A is provided around them.

In the example of FIG. 3, one heat transfer member 26 is thermally connected to each superconducting coil 20, but the present invention is not limited to this example. Alternatively, a plurality of heat transfer members 26 may be thermally connected to one superconducting coil 20. Furthermore, the location and area of the surface portion of the entire surface of the superconducting coil 20 to which the heat transfer member 26 is connected may be changed as appropriate.

The torque tube 15 integrally mechanically connects the rotor core 11, the winding attachment shaft 13, and the support ring 14 to the vacuum vessel 16, and supports each of them. The vacuum container 16 is mechanically connected to a rotating shaft 17, and the rotating shaft 17 is supported by a bearing 18.

The feeder 25 is made of a conductive material, electrically connects the superconducting coil 20 at both ends to the outside of the machine, and serves as an electrical path for supplying current to the superconducting coil 20 from the outside of the machine.

In the example of FIG. 1, the feeder 25 is connected to the outside of the machine from the outer circumferential side or the back side of the superconducting coil 20, but the feeder 25 is connected to the outside of the machine from the inner circumferential side of the superconducting coil 20. The superconducting coil 20 may be connected to the outside of the machine from the surface side of the superconducting coil 20.

The resin layer 40A is a layer made of a thermosetting resin such as melamine resin, urea resin, epoxy resin, silicone resin, or phenol resin. This resin layer 40A fixes various members arranged around the winding mounting shaft 13, such as the superconducting coil 20, the inter-coil connecting conductor 23, the feeder 25, and the heat transfer member 26. Fix mechanically. The resin layer 40A also functions as a heat transfer path between the winding mounting shaft 13 and these members, and absorbs the heat generated during energization in the superconducting coil 20, the inter-coil connecting conductor 23, the feeder 25, etc. It leads to the wire attachment shaft 13.

(Configuration of superconducting coil 20 and its surroundings)
FIG. 4 is an arrow view showing an example of the shape of the structure shown in FIG. 3 when viewed from the U direction. FIG. 5 is a cross-sectional view showing an example of the cross-sectional shape of the structure shown in FIG. 4 taken along the line VV.

As shown in FIGS. 4 and 5, the superconducting coil 20 includes, for example, a high-temperature superconducting wire 30 (hereinafter referred to as "superconducting wire 30") and an insulating tape 27 on a winding frame 21 (including the coil lead electrode 24). Insulating plates 22 are disposed on the upper and lower surfaces of the winding portion formed by the spirally wound wire, and the insulating plates 22 and the winding portion (superconducting wire 30 and insulating tape 27) on the upper and lower surfaces are connected to each other. A resin layer 40B is filled and impregnated in between.

The insulating plate 22 is made of, for example, insulating films such as polyimide, polyester polyurethane, polyamide, polyamideimide, and polyvinyl formal, thermosetting resins such as phenol resin, urea resin, and melamine resin, glass fiber reinforced plastic (GFRP), and carbon fiber reinforced plastic ( CFRP), etc., and improves the insulation protection and mechanical strength of the coil winding section.

The heat transfer member 26 is made of a material with good thermal conductivity, and has one end thermally connected to the superconducting coil 20 and the other end thermally connected to the winding attachment shaft 13. When the rotor core 11 is cooled through the refrigerant in the refrigerant flow path 12, the winding attachment shaft 13 is cooled through the cooled rotor core 11, and furthermore, the superconducting coil 20 transfers heat from the winding attachment shaft 13. Conductive cooling is provided via the member 26.

The inter-coil connection conductor 23 is made of a conductive material and electrically connects two adjacent superconducting coils 20 to each other. An end portion of the inter-coil connection conductor 23 is connected to a coil lead electrode 24 of the superconducting coil 20, for example. All the superconducting coils 20 are electrically connected in series by making similar connections with the individual coil-to-coil connecting conductors 23.

Although the example in FIG. 5 shows an example in which the inter-coil connection conductor 23 connects two superconducting coils 20 on the inner circumferential side (lower surface of the superconducting coil 20), the present invention is not limited to this example. The connection may be made on the side (the upper surface of the superconducting coil 20).

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 FIGS. 4 and 5, the mold release agent layer 50 is formed at the interface between the resin layer 40A and the superconducting coil 20 so as to cover at least a portion of the surface of the superconducting coil 20. This mold release agent layer 50 is a layer in which at least a portion of the surface of the superconducting coil 20 is treated to weaken the adhesive force with the resin layer 40A or to prevent it from adhering to the resin layer 40A. As a result, the surface of the superconducting coil 20 has a weak adhesive force with the resin layer 40A, and a gap may be formed between the surface of the superconducting coil 20 and the resin layer 40A.

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 it may be formed by applying paraffin, grease, silicone oil, or a fluorine compound. Further, the layer is not limited to these examples, and may be formed by another method as long as a layer is formed that weakens the adhesive force with the resin layer 40A or prevents it from adhering to the resin layer 40A.

The resin layer 40A covers the winding mounting shaft 13 and various members arranged around the winding mounting shaft 13, namely, the mold release agent layer 50 covering the surface of the superconducting coil 20, and the inter-coil connection conductor. 23, the heat transfer member 26, and the feeder 25 (not shown in FIG. 5) are formed by being filled and impregnated with a thermosetting resin so that there is no gap between the heat transfer member 26 and the feeder 25 (not shown in FIG. 5). to be fixed.

With such a configuration, the resin layer 40A suppresses the relative displacement of various members arranged around the winding attachment shaft 13 during rotation, while the release agent layer 50 suppresses the relative displacement of the various members arranged around the winding attachment shaft 13. The tensile stress acting on the superconducting wire 30 can be suppressed, the peeling stress acting on the superconducting wire 30 can be suppressed, and characteristic deterioration of the superconducting wire 30 can be prevented.

(Configuration of superconducting wire 30)
FIG. 6 shows an example of the configuration of the superconducting wire 30 shown in FIG. 5.

The superconducting wire 30 has a multilayer film structure in which a tape-shaped metal substrate 31 is laminated with an intermediate layer 32, an RE (rare earth element) based oxide superconducting layer 33, and a protective layer 34, and a thin film multilayer structure in which a stabilizing layer 35 is coated. Composed of wire.

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

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 of, for example, magnesium oxide.

The oxide superconducting layer 33 is a layer that exhibits superconductivity (hereinafter referred to as a "superconducting layer"), and is, for example, a superconducting thin film having RE123 system (RE ₁ Ba ₂ Cu ₃ O _y ). Note that RE is a rare earth element, such as Nd, Gd, Ho, Sm, Y, etc.

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

The stabilizing layer 35 is provided for the purpose of diverting current when excessive current flows through the superconducting layer and preventing the superconducting layer from burning, and is made of, for example, Cu.

The superconducting wire 30 has a strength in the wire thickness direction (perpendicular to the plane, thin film stacking direction) that is an order of magnitude smaller than the strength in the wire width direction and longitudinal direction (in-plane direction), and the strength within the superconducting layer is When cracks occur or delamination occurs, the superconducting properties deteriorate.

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

FIG. 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 FIG. 3, and the directions thereof. FIG. 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 and their directions in the structure shown in FIG. 4. FIG. 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 FIG. 5, and the directions thereof. FIG. 10 is a conceptual diagram showing the torque and centrifugal force acting on the superconducting wire 30 in the superconducting coil 20 due to rotation during operation of the rotor 1 in the structure shown in FIG. 6, as well as their directions.

As shown in FIGS. 7 to 10, centrifugal force F and torque T act on the superconducting coil 20 and the superconducting wire 30 due to the rotation R when the rotor 1 is operating.

On the other hand, when the rotor 1 is operating, thermal stress due to cooling acts on the entire periphery of the superconducting coil 20 (specifically, stress acts on the superconducting wire 30 in the superconducting coil 20 both in the in-plane direction and in the perpendicular direction). , tensile stress or compressive stress is applied in each direction due to the difference in thermal contraction rate of the surrounding resin and structure).

In addition, during operation of the rotor 1, torque T causes compressive stress in the rotational direction and tensile stress in the reverse direction (specifically, the outermost and innermost surfaces of the superconducting coil 20 surface). Compressive stress in the rotational direction and tensile stress in the reversal direction are applied to the plane, and tensile stress and compressive stress are applied to the superconducting wire 30 in the superconducting coil 20 in the direction perpendicular to the plane. Tensile stress in the inner diameter direction, compressive stress in the outer diameter direction (specifically, compressive stress on the upper surface of the superconducting coil 20 surface, tensile stress on the lower surface, and tensile stress in the in-plane direction on the superconducting wire 30 inside the superconducting coil 20. compressive stress) acts.

If no countermeasures are taken, these forces will act in a complex manner on the superconducting coil 20 whose surface is restrained by the resin layer 40A, and there is a possibility that stress concentration will occur locally in the superconducting coil 20. There is. When a stress concentration area occurs, the coil may be locally deformed at the stress concentration area. If the coil is locally deformed, a stress concentration area will also occur in the superconducting wire 30, and forces with various directional components will act on the superconducting wire 30. In particular, when a tensile stress acts between the resin layer 40B and the surface of the superconducting wire 30, and a force having a directional component that becomes a tensile stress in the direction perpendicular to the plane of the superconducting wire 30 acts, the superconducting wire 30 may peel. This may act as stress and cause deterioration of the characteristics of the superconducting wire 30. If the characteristics of the superconducting wire 30 deteriorate even locally, the superconducting coil 20 formed by winding the superconducting wire 30 will not be able to function normally, and as a result, the rotor 1 will not function, so it cannot be used as a superconducting rotating electric machine. It will not be established.

In contrast, in the present embodiment, as described above, the mold release agent layer 50 is applied to at least a portion of the surface of the superconducting coil 20 to weaken the adhesive force with the resin layer 40A or prevent it from adhering to the resin layer 40A. For example, as shown in FIGS. 8 and 9, a mold release agent layer 50 is formed at the interface between the resin layer 40A and the superconducting coil 20 so as to cover at least a portion of the surface of the superconducting coil 20. Therefore, it solves the above-mentioned problem.

That is, the mold 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. In other words, the surface of the superconducting coil 20 has a weak adhesive force with the resin layer 40A, and a gap may occur between the surface and the resin layer 40A. Therefore, the tensile stress that acts between the resin layer 40B and the superconducting wire 30 during operation of the rotor 1 is suppressed, the occurrence of local stress concentration areas in the superconducting coil 20 is suppressed, and local deformation of the coil is suppressed. becomes less likely to occur. In addition, since local deformation of the coil is less likely to occur, the occurrence of stress concentration areas in the superconducting wire 30 is also suppressed, and tensile stress acting on the superconducting wire 30 in the direction perpendicular to the plane is suppressed, resulting in peeling acting on the superconducting wire 30. Stress is suppressed, and characteristic deterioration of superconducting wire 30 due to peeling stress is suppressed.

According to the first embodiment, since the mold release agent layer 50 is formed at the interface between the resin layer 40A and the superconducting coil 20, the resin layer 50 can suppress relative displacement during rotation of the superconducting coil 20. 40B and the superconducting wire 30, suppressing the peeling stress acting on the superconducting wire 30, preventing property deterioration of the superconducting wire 30 due to peeling stress, and maintaining the integrity of the superconductor. A rotor for a rotating electrical machine can be provided.

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

Note that the basic structure of the rotor of the superconducting rotating electric machine according to the second embodiment is the same as that shown in FIGS. 1 to 3, and therefore the description thereof will be omitted.

Hereinafter, a structure including characteristic parts of the second embodiment will be described with reference to FIGS. 11A, 11B, and 12.

FIG. 11A is an arrow view showing a first modified example of the shape of the structure shown in FIG. 3 when viewed from the U direction (that is, a first modified example of the structure shown in FIG. 4). FIG. 11B is a developed view showing the individual superconducting coils 20 of the first modified example arranged in the circumferential direction of the rotor 1. FIG. 12 is a cross-sectional view showing a first modification of the cross-sectional shape of the structure shown in FIG. 11A taken along the line WW (ie, a first modification of the structure shown in FIG. 5).

The rotor 1 according to the second embodiment is different from the rotor 1 according to the first embodiment described above in that the release agent layer 50 is further provided at the interface between the resin layer 40A and the inter-coil connection conductor 23. It is also provided on at least a portion of the interface between the resin layer 40A and the feeder 25.

For example, as shown in FIGS. 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. Moreover, the mold release agent layer 50 is formed so as 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 FIG. 11B, the release agent layer 50 is formed to cover the surface of the feeder 25.

Thereby, the release agent layer 50 acts to weaken the adhesive force between the surface of the inter-coil connection conductor 23 and the resin layer 40A, or to prevent the surface of the inter-coil connection conductor 23 from adhering to the resin layer 40A, and , acts 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. That is, the surface of the inter-coil connection conductor 23 and the surface of the feeder 25 have weak adhesion to the resin layer 40A, and a gap may occur between them and the resin layer 40A.

In the configuration of the first embodiment described above, while the inter-coil connection conductor 23 and the feeder 25 are firmly fixed to the resin layer 40A, the surface of the superconducting coil 20 has a weak adhesion to the resin layer 40A. , a slight gap is created between the resin layer 40A and the resin layer 40A. At this time, when the torque and centrifugal force due to the rotation of the rotor 1 act in a complex manner, only the superconducting coil 20 may be relatively displaced by this small gap, but the inter-coil connecting conductor 23 and the feeder 25 is firmly bonded to the resin layer 40A, so the relative displacement is almost zero. Therefore, stress concentration areas may occur at the connection between the superconducting coil 20 and the inter-coil connection conductor 23 and at the connection between the feeder 25 and the superconducting coil 20 .

On the other hand, in the second embodiment, when the torque and centrifugal force due to the rotation of the rotor 1 act in combination, the superconducting coil 20 is relatively displaced by a small gap with the resin layer 40A. In addition, since the inter-coil connecting conductor 23 and the feeder 25 are also allowed to follow and move relative to each other, stress concentration at the connection between the superconducting coil 20 and the inter-coil connecting conductor 23 and the connection with the feeder 25 is reduced. Occurrence is suppressed.

According to the second embodiment, in addition to obtaining the same effects as the first embodiment, the mold 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 connection between the resin layer 40A and the coil. Since it is also formed at the interface with the conductor 23 and the interface between the resin layer 40A and the feeder 25, stress concentration at the connection between the superconducting coil 20 and the inter-coil connection conductor 23 and the connection with the feeder 25 is reduced. Since the occurrence of stress concentration is suppressed, it is possible to suppress the occurrence of stress concentration in the superconducting coil 20 caused by the stress concentration, and to further suppress property deterioration due to peeling stress acting on the superconducting wire 30, thereby improving soundness. It is possible to provide a rotor of a superconducting rotating electrical machine that is maintained.

<Third embodiment>
Next, a third embodiment will be described. In the following, description of parts common to the first and second embodiments will be omitted, and parts different from the first and second embodiments will be mainly described.

Note that the basic structure of the rotor of the superconducting rotating electric machine according to the third embodiment is the same as that shown in FIGS. 1 to 3, and therefore the description thereof will be omitted.

Hereinafter, a structure including characteristic parts of the third embodiment will be described with reference to FIGS. 13 and 14.

FIG. 13 is a view showing a second modification of the shape of the structure shown in FIG. 3 when viewed from the U direction (that is, a second modification of the structure shown in FIG. 4). FIG. 14 is a cross-sectional view showing a second modification of the cross-sectional shape of the structure shown in FIG. 13 (ie, a second modification of the structure shown in FIG. 5).

The difference between the rotor 1 according to the third embodiment and the rotor 1 according to the second embodiment described above is that the release agent layer 50 is further provided at the interface between the resin layer 40A and the heat transfer member 26. This point is also provided at least in some parts.

For example, as shown in FIGS. 13 and 14, the mold 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.

Thereby, the mold 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 connection conductor 23 from adhering to the resin layer 40A. In other words, the surface of the heat transfer member 26 has a weak adhesive force with the resin layer 40A, and a gap may occur between the surface and the resin layer 40A.

In the configuration of the second embodiment described above, the heat transfer member 26 and the resin layer 40A are each firmly fixed, while the surfaces of the superconducting coil 20, the inter-coil connection conductor 23, and the feeder 25 are bonded to each other by the resin layer. The adhesive force with the resin layer 40A is weak, and a slight gap is created between the resin layer 40A and the resin layer 40A. At this time, when the torque and centrifugal force due to the rotation of the rotor 1 act in combination, the superconducting coil 20, inter-coil connecting conductor 23, and feeder 25 may be relatively displaced by this small gap. 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.

On the other hand, in the third embodiment, 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 are removed by the slight gap between the resin layer 40A. Even if the heat transfer member 26 is relatively displaced by the same amount, the heat transfer member 26 is allowed to follow the relative displacement, so the occurrence of stress concentration at the connection between the superconducting coil 20 and the heat transfer member 26 is suppressed. Ru.

According to the third embodiment, in addition to obtaining the same effects as the second embodiment, since the mold release agent layer 50 is also formed at the interface between the resin layer 40A and the heat transfer member 26, superconducting Since the occurrence of a stress concentration part at the connection part between the coil 20 and the heat transfer member 26 is suppressed, the occurrence of a stress concentration part in the superconducting coil 20 due to the stress concentration part can be suppressed, and the superconducting wire 30 It is possible to further suppress characteristic deterioration due to peeling stress acting on the rotor of a superconducting rotating electrical machine and to maintain better soundness.

As described in detail above, according to each embodiment, it is possible to suppress deterioration of characteristics of the superconducting wire due to stress acting on the superconducting coil.

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, changes, and combinations can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

DESCRIPTION OF SYMBOLS 1... Rotor, 11... Rotor core, 12... Refrigerant flow path, 13... Winding attachment shaft, 14... Support ring, 15... Torque tube, 16... Vacuum container, 17... Rotating shaft, 18... Bearing, 20... Superconducting coil , 21... Winding frame, 22... Insulating plate, 23... Inter-coil connection conductor, 24... Coil lead-out electrode, 25... Feeder, 26... Heat transfer member, 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... Mold release agent layer.

Claims (7)

Superconducting coils provided at each part of the winding mounting shaft arranged around the rotor core,
a resin layer that mechanically fixes various members including at least the superconducting coil;
a release agent layer provided on at least a portion of the interface between the resin layer and the superconducting coil;
A rotor for a superconducting rotating electrical machine, comprising: The release agent layer is
A layer in which at least a portion of the surface of the superconducting coil is treated to weaken the adhesive force with the resin layer or to prevent it from adhering to the resin layer.
A rotor for a superconducting rotating electric machine according to claim 1. The release agent layer is
A layer formed by adhering or applying a release agent to at least a portion of the surface of the superconducting coil,
A rotor for a superconducting rotating electric machine according to claim 1. The various members mentioned above are:
It includes an inter-coil connection conductor that electrically connects each superconducting coil in series,
The release agent layer is
Also provided on at least a part of the interface between the resin layer and the inter-coil connection conductor,
A rotor for a superconducting rotating electrical machine according to claim 1. The various members mentioned above are:
including a feeder that electrically connects the superconducting coil and the outside of the machine,
The release agent layer is
Also provided at least part of the interface between the resin layer and the feeder,
A rotor for a superconducting rotating electric machine according to claim 1. The various members are:
a heat transfer member having one end thermally connected to the superconducting coil and the other end thermally connected to the winding attachment shaft;
The release agent layer is
Also provided at at least a part of the interface between the resin layer and the heat transfer member,
A rotor for a superconducting rotating electric machine according to claim 1. A superconducting rotating electric machine configured using the rotor of the superconducting rotating electric machine according to any one of claims 1 to 6.