JPH0748419B2 - Superconducting coil device - Google Patents

Description

TECHNICAL FIELD The present invention relates to, for example, a rotor of a superconducting rotating electric machine, and particularly to a superconducting coil device which can be preferably used as a superconducting field coil or the like.

[Prior Art] Conventionally, there is a general rotor using this type of superconducting coil as shown in FIG. In FIG. 5, (1)
Is a torque tube, (2) is a coil mounting shaft forming a central portion of the torque tube (1), (3) is a superconducting field coil as a superconducting coil device fixed to the coil mounting shaft (2), (4) ) Is a room temperature damper surrounding the torque tube (1) and the coil mounting shaft (2), (5) is a low temperature damper disposed between the room temperature damper (4) and the coil mounting shaft (2), 6) and (7) are helium outer cylinders and helium end plates attached to the outer peripheral portion and side surface portion of the coil attachment shaft (2), and (8) and (9) are drive side and non-drive side end axis, respectively. , (10) are bearings for supporting these end shafts (8), (9), (11) are slip rings for supplying a field current, and (12) are formed or arranged in the torque tube (1). The heat exchanger, (13) the side radiation shield, (14) the vacuum part. is there.

In the rotor of the superconducting rotating electric machine having the above configuration,
By cooling the superconducting field coil (3) arranged on the coil mounting shaft (2) to a cryogenic temperature, the electric resistance is brought to a state of zero and the excitation loss is eliminated. ), A strong magnetic field is generated, and AC electric power is generated in a stator (not shown). In order to cool and hold the superconducting field coil (3) at an extremely low temperature, liquid helium is introduced from the center of the end shaft (9) on the non-driving side (not shown).
Through the helium outer cylinder (6) and the helium end plate (7) to the liquid helium container part, while maintaining a high vacuum inside the rotor by the vacuum part (14), and at the same time, the cryogenic superconducting field. The torque tube (1) that transmits the rotational torque to the coil (3) and the coil mounting shaft (2) is a thin-walled cylinder, and a heat exchanger (12) is provided, and heat that enters the cryogenic part through this torque tube (1) The most common structure is to reduce Further, a side radiation shield (13) is provided in order to reduce heat entering by radiation from the side surface.

On the other hand, the room temperature damper (4) and the low temperature damper (5) shield the harmonic magnetic field from the stator, protect the superconducting field coil (3), and attenuate the rotor vibration due to the disturbance of the power system. In general, the normal temperature damper (4) has a function as a vacuum outer cylinder, and the low temperature damper (5) also has a function as a radiation shield for a helium container while having a function. In FIG. 5, the liquid helium introduction / exhaust device connected to the pipes and the rotor constituting the liquid helium introduction / exhaust system inside the rotor is omitted.

A conventional superconducting coil (3) of this type is, for example, Japanese Patent Laid-Open No.
There is one described in Japanese Patent Laid-Open No. 54-7509. FIG. 6 is a perspective view of a superconducting wire that constitutes a conventional superconducting field coil. (15) is a superconducting wire, and (16) is an insulating tape spirally wound around the superconducting wire (15). The material (hereinafter, simply referred to as an insulating tape), (17) is a surface not covered with the insulating tape (16) and is directly cooled by a cooling liquid such as liquid helium. FIG. 7 is a sectional view schematically showing the structure of a conventional insulating tape. The insulating tape (16) is made by impregnating the epoxy resin (19) inside the glass cloth tape (18) and by adhering the epoxy resin (19) to the surface of the glass cloth tape (18) as well. Is a so-called prepreg epoxy glass cloth tape.

The superconducting wire (15) provided with the insulating tape (16) is wound in a plurality of rows and a plurality of stages adjacent to each other to form a superconducting field coil (3). As a result, as shown in FIG. 8, a gap about twice the thickness of the insulating tape (16) is created between the superconducting wires (15), and a cooling fluid passage (20) is formed around the superconducting wires. It is formed. Further, after winding and hardening treatment, the superconducting wire (15) and the mutual epoxy resin (16) are adhered to each other to form a strong superconducting coil.

[Problems to be Solved by the Invention] Since the conventional superconducting coil device is configured as described above, when the insulating tape is subjected to high pressure during press molding at the winding stage, the semi-cured glass cloth tape is formed. There is a problem that the resin thickness excessively flows out and the thickness of the tape decreases because the glass cloth tape is flexible. If this happens, the cooling part (17) of the superconducting wire will be covered with resin and the area will be reduced, and the cooling passage (20) will be confined.
Cooling performance decreases. As a result, the superconducting state may not be maintained, and for example, the functions of the superconducting generator may stop.

The present invention has been made to solve the above problems, and an object thereof is to obtain a superconducting coil device having high cooling performance by ensuring a cooling passage.

[Means for Solving the Problems] A superconducting coil device according to the present invention is made of a fiber material,
Also, a tape impregnated with a resin material and at least the width-direction central portions of both front and back surfaces of the tape are exposed, and both width-direction end portions of the tape are exposed along the tape length direction so as to block both end surfaces of the tape. The tape material is composed of the polymer film integrally disposed on the.

[Operation] The polymer film of the present invention generally has a low compression rate, and at least the central portions in the width direction of both the front and back surfaces of the tape are exposed, and the both end surfaces of the tape are closed along the tape length direction. Since the tape is integrated at both ends in the width direction of the tape, the pressure is received by the polymer film during press forming in the winding stage of the superconducting wire, suppressing the decrease in the thickness of the polymer film and suppressing A gap is secured between them, and at this time the polymer film is in close contact with the superconducting wire, and the resin material oozing out from the tape is prevented from flowing out between the tape materials, and a gap is secured between the tape materials, which allows the refrigerant flow. Secure a path.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a perspective view showing a wound state of an insulating tape in a superconducting coil according to an example, and FIG. 2 is a sectional view of the insulating tape used. Reference numeral (18) is a glass cloth tape as a tape using a fibrous material, which is impregnated with an epoxy resin (19) and also has the epoxy resin (19) adhered to the surface thereof. (21) is a polymer film, and as shown in FIG. 2, it is arranged so as to wrap both ends of the glass cloth tape (18) in the width direction, and epoxy resin (19) is applied only to the surface. ing. The epoxy resin (19) is held in a semi-cured state when the tape is wound. As the polymer film, for example, polyimide,
Polyamide, polyethylene terephthalate and the like are mentioned, and these are excellent in both electric insulation strength and compressive strength.

The insulating tape (16) that has been semi-cured is a glass cloth tape (18) even when high pressure is applied during coil press molding.
Since the polymer film (21) having a small compressibility is disposed at both ends of the epoxy, the amount of change in thickness is small, and the epoxy impregnated in the glass cloth tape of (18) by the polymer film (21) is used. Since the resin can be prevented from flowing out, the area of the cooling passage (20) can be minimized.

On the contrary, even when the superconducting wires (15) are widely spaced from each other during press molding and the pressure applied to the insulating tape (16) is small, the glass cloth tape (18) changes to the epoxy resin (19).
Properly flows out and spreads on the adhesive surface, so that a strong adhesive force is obtained after curing.

FIG. 3 and FIG. 4 are views showing the main part of another embodiment of the present invention. In this embodiment, the polymer film (21) adheres to both ends of the glass cloth tape (18) in the width direction. A semi-curable resin is applied to the surface of the tape (16) when the tape (16) is wound. Even in the case of this embodiment, substantially the same effects as those shown in FIGS. 1 and 2 can be expected.

In the above embodiment, the glass cloth tape (18) and the polymer film (21) each have one layer, but either one or both may have a plurality of layers. Further, a resin other than the epoxy resin may be used. Further, although the glass cloth tape is used as the tape using the fiber material, the tape is not necessarily limited to this. Further, it goes without saying that the cooling medium should be determined according to the critical temperature of the superconducting wire used, and is not limited to liquid helium.

By the way, although the case where the present invention is used for the field coil of the rotor of the superconducting rotary electric machine has been described in the above description of the embodiments, the present invention is not necessarily limited to this.

[Effects of the Invention] As described above, according to the present invention, the fiber material is used.
Also, a tape impregnated with a resin material and at least the width-direction central portions of both front and back surfaces of the tape are exposed, and both width-direction end portions of the tape are exposed along the tape length direction so as to block both end surfaces of the tape. Since the tape material is made up of the polymer film and the polymer film that are integrally arranged in the upper part, the cooling passage is not narrowed by press molding during manufacturing, and the required cooling passage can be easily secured. There is an effect that a coil device can be obtained.

[Brief description of drawings]

1 and 2 are a perspective view and a cross-sectional view, respectively, showing the essential parts of a superconducting coil device according to an embodiment of the present invention. FIG. 3 and FIG. 4 are a perspective view and a sectional view, respectively, showing the main parts of another embodiment of the present invention. FIG. 5 is a sectional view of a rotor of a general superconducting rotating electric machine, FIG. 6 is a perspective view of a superconducting wire constituting a conventional superconducting field coil, and FIG. 7 is a sectional view of a conventional insulating tape. The figure is a partial sectional view of a conventional superconducting field coil. In the figure, (15) is a superconducting wire, (16) is an insulating tape as a tape material, (18) is a glass cloth tape as a tape using a fiber material, (19) is an epoxy resin as a resin material, and (20). Is a passage for a cooling fluid, and (21) is a polymer film. The same reference numerals in the drawings indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masao Shibamaru 1-2-2 Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Electric Corporation Kobe Works

Claims (1)

[Claims] 1. A superconducting coil device in which an insulating tape material is spirally wound around a superconducting wire to form a cooling fluid passage around the superconducting wire and between the superconducting wires. Is made of fiber material, and
A tape impregnated with a resin material and at least the central portions in the width direction of both the front and back surfaces of the tape are exposed, and the tape is integrally formed at both end portions in the width direction of the tape along the tape length direction so as to block both end surfaces of the tape. And a polymer film disposed on the superconducting coil device.