JPS59141206A - Manufacture of magnet - Google Patents

Abstract

PURPOSE:To strengthen fixation of the superconductor of a magnet, and to make impregnation work after winding work unnecessary by a method wherein the conductor formed with an insulating layer consisting of a fibrous material on the surface is immersed and passed in a thermosetting resin liquid to impregnate the resin liquid, and after winding work is performed in this condition, the impregnated resin liquid is hardened. CONSTITUTION:A conductive wire 12 manufactured by forming an insulating material layer 14 consisting of a fibrous material on the surface of a conductor 13 is led out from a supply drum 11, and is guided being supported by a guide roller 15 to a resin tank 17 filled up with a thermosetting resin liquid 16 proccessed previously with the deaeration process, and after the thermosetting resin liquid 16 is impregnated to the insulating material layer thereat, the conductor is wound into a coil winding on a magnet bobbin 19 equipped to a winder. Then the resin impregnated to the insulating material layer of the winding A wound in a coil winding on the magnet bobbin 19 is hardened in a heating oven to fix to be formed in one body between the conductors and between the conductor and the insulating layer. A tension applying device 18 is interlocked to the supply drum 11 and the magnet bobbin 19, and is controlled as to make the superconductor 12 to hold the prescribed tension.

Description

[Detailed Description of the Invention] The present invention relates to a method for manufacturing superconducting magnets used in magnets for nuclear fusion devices, coils for magnetic levitation trains, etc. The formed conductor is immersed in a thermosetting resin liquid that has been degassed in advance to impregnate the insulating layer of the conductor with the resin liquid, and after winding in this state, the impregnated resin liquid is hardened and the resin liquid is applied between the conductors and between the conductors. The present invention relates to a method for manufacturing a magnet characterized by fixing and integrating an insulating layer and an insulating layer.

The stability of a magnet depends on the stability of the superconducting wire itself and the stability of the coil itself.

The instability of superconducting wires themselves is being rapidly improved due to technological advances such as the combination of superconductors and normal conductors that are good electrical and thermal conductors, thinning of superconductors, and twisting of superconductors. .

On the other hand, for the purpose of immobilizing superconductors, methods have been adopted in which synthetic resins, grease, wax, low melting point alloys, etc. are impregnated and then solidified, but these methods are still insufficient compared to the technological advances in superconductors themselves. However, it has many problems.

For example, there are methods in which a coiled superconducting wire is immersed in a liquid fixative and then impregnated under reduced pressure, a method in which a superconducting wire is wound in a coil while being immersed in a fixative, and a method in which a coil is wound while a fixing agent is dropped. However, these methods have problems such as not being able to completely impregnate the fixing agent into the gap between the coils, not being able to uniformly disperse various fillers, and due to heat shrinkage and curing shrinkage of the resin. The problem is that cracks occur in the fixing agent, making it difficult to prevent the superconducting wire from moving using the fixing agent alone.

Therefore, when the superconducting wire is subjected to electromagnetic force, it may cause movement of the superconducting wire, which may deteriorate the characteristics of the magnet.

Therefore, in order for the superconducting magnet to operate stably, the inventors of the present invention discovered that it is necessary to secure and reinforce the superconducting wires wound around the coil to prevent the wires from moving against the electromagnetic force generated when electricity is applied. As shown in Figure 1, the conductor 2 is coiled around a winding frame 1 with an insulating material 3 made of a fibrous material and a semi-hardened thermosetting resin interposed therebetween, and then the insulating material is (2) As shown in Figure 2, the conductor 2 is wound with a fibrous material 4 interposed between the layers as an insulating layer, and then the thermosetting resin is heated in a vacuum. The method of impregnating, then curing and fixing was explored.

However, method (1) uses FRP (Fiber
It is similar to Re1n-forced Plastics), and has disadvantages such as the unavoidable residual voids, weak fixing force, and poor thermal conductivity, making it difficult to cool the internal conductor. In method 2), since the conductor is wound very closely, the impregnation path of the resin cannot be easily taken, so only the vacuum line is likely to be impregnated, and areas further away are likely to be left unimpregnated. thing,
Since resin impregnation work is performed separately after winding, the manufacturing process is complicated and vacuum impregnation equipment is required. This invention was created by further research into a method for producing a magnet that is completely impregnated and has no internal voids.

Hereinafter, the method of the present invention will be explained based on FIGS. 3 to 5 showing one embodiment thereof.

In FIG. 3, reference numeral 11 denotes a supply drum, on which, as shown in FIG. 4, a conductive wire 12 having an insulating material layer 14 made of a fibrous material formed on the surface of a conductor 13 is wound.

The conductive wire 12 is pulled out from the supply drum 11, supported by a guide roller 15, and is supported by a thermosetting resin liquid 16.
There, the insulating material layer is impregnated with the thermosetting resin liquid 16, and then coiled around a magnet bobbin 19 attached to a winding machine (not shown).

FIG. 5 shows a cross section of the winding A wound around the magnet bobbin 19.

The winding A thus wound into a coil is then hardened with the resin impregnated into the insulating material layer in a heating furnace (not shown), and the conductors and the conductor and the insulating layer are fixed and integrated to obtain a magnet. It is.

In FIG. 3, reference numeral 18 denotes a tension applying device, which is linked to the supply drum 11 and the magnet bobbin 19, so that the superelectric wire 12 is always kept within a constant tension from impregnation with resin liquid to winding onto the magnet bobbin 19. This is for defoaming the resin liquid 16.

In this invention, the fibrous material used to form the insulating material layer on the surface of the conductive wire includes ensuring an interlayer insulating layer of the superconducting wire, ensuring an impregnation path for the thermosetting resin liquid as a fixing agent, and thermosetting resin. It is preferable to use materials that can improve the thermal and mechanical properties of the liquid, including various organic and inorganic fibers such as long fibers, cloth, and short fibers such as glass, carbon, Kepler, boron, silicon carbide, alumina, and asbestos. etc. are appropriate.

Further, examples of the thermosetting resin used to impregnate the above-mentioned insulating layer to integrally fix the conductors and the conductor and the insulating layer include epoxy resins, unsaturated polyester resins, polyurethane resins, diallyl phthalate resins, and the like.

Thus, in the method of the present invention, (1) an insulating layer made of a fibrous material coated on the surface of a superconducting wire is impregnated with a thermosetting resin liquid that has been defoamed in advance, and the resin-impregnated superconducting wire is attached to a magnetic bobbin. By squeezing out the resin by applying a constant tension with a tension applying device when winding it up, it is possible to obtain a magnet that is free from voids and has strong fixation between the superconducting wires and between the insulating layer and the superconducting wire. .

(2) As mentioned in (1), there are almost no voids, so a magnet with excellent heat conduction can be obtained.

(3) When winding the superconducting wire onto a magnet bobbin, it is already impregnated with a defoamed resin, so there is no need for resin impregnation work after winding.

It has the following effects.

However, the manufacturing method of this invention is effective not only for manufacturing superconducting magnets but also for normal conducting magnets.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the state of coil winding of a conventional solenoid-shaped superconducting magnet, Fig. 2 is a sectional view of the same superconducting coil, Fig. 3 is a process diagram showing the magnet manufacturing method of the present invention, and Fig. 4 is this FIG. 5 is a sectional view of a conductive wire used in the present invention, which is impregnated with a resin and then wound. 11... Supply drum 12... Conductive wire 13.
...Conductor 14...Insulating layer 16...Thermosetting resin liquid 17...Resin tank 18...Tension applying device 19...Magnet bobbin 20...Vacuum pump 21...Vacuum pipe patent applicant
Sumitomo Electric Industries Co., Ltd. Representative Patent Attorney Akira Wada Figure 1 Figure 2 Figure 8

Claims (3)

[Claims] (1) A conductor on which an insulating layer made of a fibrous substance has been formed on the surface thereof is immersed in a thermosetting resin liquid that has been previously subjected to a defoaming treatment to impregnate the insulating layer on the surface of the conductor with the resin liquid,
A method for manufacturing a magnet, which comprises winding the wire in that state and then hardening the impregnated resin liquid to fix and integrate the conductors and between the conductors and the insulating layer. (2) The method for manufacturing a magnet according to claim 1, wherein the conductor having an insulating layer on its surface is impregnated with a resin and wound with a constant tension applied thereto. (3) The fibrous material is at least one organic or inorganic fiber.
The method for producing a magnet according to claim 1, characterized in that the magnet is made of seeds.