JPH0740783B2 - Superconducting field winding of rotating electric machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting field winding for a rotating electric machine.

[0002]

2. Description of the Related Art A conventional superconducting rotor is disclosed in JP-A-56-56.
As described in Japanese Patent No. 168, it is configured to be rotatable about an axis, and is provided with a plurality of groove assemblies on the outer circumference of the rotor, the groove assemblies extending substantially along the length of the rotor. The groove assembly has a plurality of side walls extending in the radial direction with respect to the axis and a plurality of superconducting conductor rows composed of a plurality of superconducting conductors stacked in the radial direction with respect to the axis. Each superconducting conductor has a substantially rectangular cross section with surfaces parallel to the sidewalls and surfaces orthogonal to these surfaces, the orthogonal surfaces having an insulator thereon. The groove assembly is further provided, one on each radial side surface of each superconducting conductor row, and has a plurality of insulators having a surface parallel to the side wall having a plurality of coolant channels, and a coolant flow channel. A supply device for supplying the channel and a removal device for removing the coolant from the flow channel are provided.

[0003]

In the above prior art, a superconducting conductor having a twisted wire structure of a plurality of superconducting wires has recently been used for the purpose of magnetic stability and reduction of AC loss. Further, for the purpose of firmly supporting this superconducting conductor in the groove and improving the cooling effect, a single material of glass fiber reinforced plastic has been recently used as the in-winding insulator. For this reason, a strong compressive stress acts on the contact surface between the superconducting conductor and the in-winding insulator due to centrifugal force and electromagnetic force during operation. No consideration is given to the addition of stress concentration to.

Due to this stress concentration, the insulator in the winding is easily damaged, and the damage impairs the insulating function and the function of supporting and fixing the superconducting conductor, resulting in a layer short circuit and a quench phenomenon. Also, since the superconducting conductor and the in-winding insulation are in point or line contact, minute movements of the superconducting conductor due to electromagnetic force during operation are likely to occur, and no consideration is given to the occurrence of friction. There was a problem of causing a quench phenomenon.

The present invention has been made in view of the above points, and an object of the present invention is to provide a superconducting field winding for a rotating electric machine, which can be electrically and mechanically stabilized. is there.

[0006]

The above object is to provide an elastic member provided with a groove side surface insulator, a groove bottom insulating material, a groove top insulating material, an inter-row insulating material and an interlayer insulating material on a surface side in contact with a superconducting conductor. , By forming a composite insulator composed of a fiber-reinforced plastic core material holding the elastic member,
To be achieved.

[0007]

Since the above-mentioned means is provided, the superconducting conductor is firmly supported and fixed during the rotation excitation, and the stress concentration of the insulator in the winding is alleviated.

[0008]

EXAMPLES Next, the present invention will be specifically described by way of examples.

[Embodiment 1] FIGS. 1 to 3 show an embodiment of the present invention. The winding 3 housed in the groove 2 provided in the winding support ring 1 and cooled by the refrigerant is
Is insulated via the groove side surface insulator 4, the groove bottom insulator 5, and the groove top insulator 6, and the winding 3 has a plurality of superconducting conductors 9 through the inter-row insulator 7 and the inter-layer insulator 8. In superconducting field windings of rotating electrical machines that are stacked,
In this embodiment, the groove side surface insulator 4, the groove bottom portion insulator 5, the groove top portion insulator 6, the inter-row insulator 7 and the interlayer insulator 8 are provided on the surface side in contact with the superconducting conductor 9, and the elastic member 10 is provided. It is formed of a composite insulator composed of a fiber-reinforced plastic core material 11 for holding the elastic member 10. By doing so, the superconducting conductor 9 is firmly supported and fixed during rotational excitation, and the stress concentration of the insulator in the winding is alleviated, so that it is electrically and mechanically stable. It is possible to obtain a superconducting field winding of a rotating electric machine that enables the above.

FIG. 1 (a) shows the appearance of the winding support ring of the superconducting generator rotor. The outer surface of the winding support ring 1 has a superconducting conductor, the winding support ring 1 and an electric wire. A plurality of grooves for accommodating the winding structure 12 composed of an insulating material that electrically insulates and a coolant flow path are provided. Each groove is an annular groove having an axial straight portion at the axial center of the winding support ring 1 and a circumferential arc portion at the end. In this groove, there is also a filling material that fills the gap between the wall of the groove and the winding structure 12 so that the winding structure 12 that receives a strong electromagnetic force and centrifugal force does not move in the groove. Liquid helium as a refrigerant is filled in a vacuum heat insulation container (not shown) that encloses the winding support ring 1 in the same figure, and when the winding support ring 1 is rotating, the liquid level thereof is Try to reach the inside of 1.

Each cross section of the groove and the winding structure 12 shown in FIG. 1A is shown in FIG. 1B, but the cross section of the groove 2 is open to the outside of the winding support ring 1. It is a rectangle with parts. In some cases, the winding 3 may be slightly wedge-shaped toward the radial direction in order to easily fix the winding 3 in the groove 2 with a filler. For electrical insulation between the winding 3 and the winding support ring 1, the groove bottom, the groove top, and the groove side surface insulators 5, 6, 4 are arranged so as to surround the winding 3 from the periphery. The winding 3 is fixed in the circumferential direction by means of the groove-side insulator 4 and the wedge-shaped groove-side filling 13 in which the surfaces in contact with the groove-side insulator 4 are parallel to each other or the distance between the faces becomes narrower toward the center of the winding support ring 1. The radial fixing is effected by a groove top filling 14 which holds the groove top insulator 6 towards the center of the winding support ring 1. The groove top filling 14 is made to be caught from the inside of the groove 2 by a hook-shaped projection provided on the groove side surface near the opening of the groove 2 to obtain a sufficient fixing pressure. At this time, the groove side surface insulator 4 and the groove side surface filling 13 and the groove bottom, the groove top insulating bodies 5 and 6 or the groove top filling 1
4 must not interfere with each other to obtain sufficient fixing pressure.

A coolant channel 15 communicating with the inside of the winding support ring 1 is provided at the bottom of the groove, and a coolant channel 16 communicating with the outside and the inside of the groove top filling 14 is provided, and each of the above-described insulators 4, 5,
6 and a refrigerant flow path provided in an in-winding insulator, which will be described later, and a return refrigerant flow path from the inside to the outside of the winding support ring 1 (both not shown), any part of the winding 3 A flow path for natural convection of liquid helium 17 that flows from the outside to the inside of the winding support ring 1 that generates heat as a driving force when heat is generated is formed.

As shown in FIG. 1 (c), which shows the cross section of the winding 3 shown in FIG. 1 (b), the refrigerant has a refrigerant flow path (see FIG. (Not shown) flows from top to bottom. That is, the lower surface of the figure contacts the groove bottom insulator, and the upper part of the figure contacts the groove top insulator. The superconducting conductor 9 electrically insulates the layers and the columns from each other by an inter-column insulator 7 and an interlayer insulator 8. The coolant flow path of the coolant is formed by grooving the inter-row insulator 7 or by forming strip-shaped ones arranged periodically in the winding direction as appropriate. The superconducting conductor 9 is exposed in this coolant channel so as to be in direct contact with the liquid helium coolant.

FIG. 2 shows the inter-row insulator 7 and the interlayer insulator 8 shown in FIG. 1 (c). These insulators 7 and 8 are made of glass fiber reinforced plastic or aramid fiber reinforced plastic. Superconducting conductor 9 as core material 11
It is a composite insulator in which an elastic member 10 such as a silicone resin coating, heat-resistant paper or heat-resistant film is provided on the surface in contact with. FIG. 3 shows the groove side surface insulator 4, the groove bottom insulator 5, and the groove top insulator 6 shown in FIG. 1B. These insulators 4, 5, and 6 are in contact with the superconducting conductor. Since the surface is one side, the composite insulator in which the elastic member 10 is provided only on one side is used. That is, for example, glass reinforced plastic was used for the core material 11, and silicone resin was applied to one surface of the glass fiber reinforced plastic. By doing so, the stress concentration due to the local contact of the superconducting conductor 9 with respect to the strong centrifugal force of the superconducting conductor 9 during operation is relaxed, and the interlayer insulator 8 and the inter-row insulator 7 are prevented from being damaged. You can Furthermore, it suppresses minute movement of the superconducting conductor 9 against electromagnetic force during operation,
Since it is possible to prevent heat generation due to friction with, it is possible to obtain a stable field winding in which quenching does not occur.
Further, since fiber-reinforced plastic is used for the core material 11, the size of the winding can be kept constant, so that the superconducting conductor 9 can be easily fixed firmly.

As described above, according to this embodiment, the superconducting conductor, which is supported and fixed in the groove of the rotor of the superconducting generator, is firmly supported during rotation excitation, and the surface where the superconducting conductor and the insulator come into contact with each other. It is possible to obtain a field winding of a superconducting generator capable of relieving the concentrated stress in the above and suppressing the minute movement of the superconducting conductor.

[0016]

As described above, the present invention provides a groove side surface insulator,
An elastic member provided with a groove bottom insulator, a groove top insulator, an inter-row insulator and an interlayer insulator on the surface side in contact with the superconducting conductor,
Since the superconducting conductor is firmly supported and fixed during the rotational excitation, and the stress concentration in the winding insulator is relieved because it is formed of the composite insulator composed of the fiber-reinforced plastic core material holding the elastic member. As a result, it is possible to obtain a superconducting field winding of a rotating electric machine that can be electrically and mechanically stabilized.

[Brief description of drawings]

1 shows an embodiment of a superconducting field winding of a rotating electric machine of the present invention, (a) is a perspective view of a rotor, and (b) is (a).
3 is a cross-sectional view of the groove and the winding structure of FIG. 3, and FIG. 7C is a cross-sectional view of the winding of FIG.

FIG. 2 is an enlarged cross-sectional view of the inter-row insulator and the interlayer insulator of FIG. 1 (c).

3 is an enlarged cross-sectional view of each insulator of FIG. 1 (b).

[Explanation of symbols]

1 ... Winding support ring, 2 ... Groove, 3 ... Winding wire, 4 ... Groove side surface insulator, 5 ... Groove bottom insulator, 6 ... Groove top insulator, 7 ... Inter-row insulator, 8 ... Interlayer insulator, 9 ... Superconducting conductor, 10 ... Elastic member, 11 ... Core material.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-199443 (JP, A) JP-A-62-213546 (JP, A) JP-A-1-133561 (JP, A) JP-A-3- 284159 (JP, A) JP-A-3-145963 (JP, A)

Claims (6)

[Claims] 1. A housing accommodated in a groove provided in a winding support ring,
And the winding cooled by the refrigerant, the groove and groove side surface insulator,
A superconducting field winding for a rotating electric machine, which is insulated through a groove bottom insulator and a groove top insulator, and in which the winding is formed by superconducting conductors stacked in a plurality of rows through inter-row insulators and interlayer insulators. In, the groove side surface insulator, the groove bottom insulator, the groove top insulator, the inter-row insulator and the interlayer insulator,
A superconducting field for a rotating electric machine, characterized in that the superconducting field is formed of a composite insulator composed of an elastic member provided on a surface side in contact with the superconducting conductor, and a core material of a fiber reinforced plastic holding the elastic member. Magnetic winding. 2. The superconducting field winding for a rotating electric machine according to claim 1, wherein the elastic member is a silicone resin. 3. The superconducting field winding for a rotating electric machine according to claim 1, wherein the composite insulator is formed by using synthetic aramid paper for the elastic member and glass fiber reinforced plastic for the fiber reinforced plastic of the core material. . 4. The superconducting field winding for a rotating electric machine according to claim 1, wherein the composite insulator is made of synthetic aramid paper for the elastic member and aramid fiber reinforced plastic for the fiber reinforced plastic of the core material. . 5. The composite insulator is formed by using a polyimide film for the elastic member and glass fiber reinforced plastic for the fiber reinforced plastic of the core material.
The superconducting field winding of the rotating electric machine described. 6. The superconducting field winding for a rotating electric machine according to claim 1, wherein the composite insulator is formed by using a polyimide film for the elastic member and aramid fiber reinforced plastic for the fiber reinforced plastic of the core material.