JPH04264704A - Saddle-shaped coil and manufacture of saddle-shaped coil - Google Patents

Abstract

PURPOSE:To acquire a saddle-shaped coil whose end part is formed readily and which is resistant to electromagnetic force. CONSTITUTION:Clearances 5a, 5b which divide all the turns into a plurality are provided to a longitudinal end part of a saddle-shaped coil 1. Spacers 4A, 4B are inserted to the clearances 5a, 5b, an end block 3 is inserted to an outside of the longitudinal end part, and they are joined to a conductor with epoxy resin.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saddle-shaped coil used in superconducting magnets such as particle accelerators and a method for manufacturing the saddle-shaped coil.

0003

2. Description of the Related Art Among saddle-shaped coils used in superconducting magnets, there is one shown in FIG. 5, which is described in Japanese Patent Application Laid-Open No. 63-9904, for example.

In the figure, the saddle-shaped coil 11 is made of Nb3
The Sn monolithic conductor is shaped approximately like a ship in the figure, in a plan view (not shown) in the shape of an elliptical spiral with a straight section parallel to the longitudinal direction, and in a side view (not shown) in the shape of a semicircle, spaced apart on the outer periphery. It is molded by being wrapped around the outer periphery of a center pipe (not shown) coated with a shape material. Next, the end block 1 is coated with epoxy resin on the curved surface 13a from both ends.
3 are pressed respectively, and the center pole 12 coated with epoxy resin is inserted into the center. Then, in the same figure, pressure is applied from the top, bottom, left and right using a pressure jig (not shown), and the monolithic conductor is inserted into a heating furnace. The epoxy resin exuded from the pre-wound epoxy resin-impregnated tape (not shown) is cured, and the end blocks 13 and center pole 12 are integrally joined between each layer.

[0005]

However, in the saddle-shaped coil having such a configuration, the complicated three-dimensional bent portions at both ends of the saddle-shaped coil 11 are bent in accordance with the curvature of the outer surface of the adjacent inner conductor. The outer conductor is bent little by little with a small curvature, but since the conductor returns elastically, as the number of turns increases, the interlayers, especially at the top end, become wider. Then, the outer surface of the conductor at the outer end and the inner curved surface 13a of the end block 13
and the inner curved surface 1 of the end block 13.
The gap between it and 3a increases. On the other hand, in a superconducting coil, as is well known, when the conductor moves due to electromagnetic force due to excitation,
There is a quench phenomenon that transitions from superconducting state to normal conduction.

[0006] Therefore, in the conventional saddle-shaped coil,
After forming, spacing pieces were inserted into the gaps between the conductors to prevent the quench phenomenon, but this was not only time-consuming, but also caused variations in the gaps between the conductors, making it difficult for superconducting magnets to use multiple saddle-shaped coils. There is also a risk that the magnetic field of the particle accelerator may vary, impairing the characteristics of the particle accelerator.

Therefore, the first and second objects of the present invention are to obtain a saddle-shaped coil that is easy to manufacture and can always generate a predetermined magnetic field. An object of the present invention is to obtain a method for manufacturing a saddle-shaped coil that can easily manufacture a saddle-shaped coil that generates a magnetic field of . [Structure of the invention]

[0008]

[Means and effects for solving the problems] One aspect of the present invention is a saddle-shaped coil in which a conductor is wound in an oval spiral shape, and a plurality of conductor rows are provided between both longitudinal ends of the saddle-shaped coil. By forming a roughly σ-shaped gap that divides the
It is a saddle-shaped coil that allows the conductor to be easily formed and can always generate a predetermined magnetic field by reducing the electromagnetic force applied to the conductor at both ends.

[0009] The second aspect of the present invention is that in a saddle-shaped coil in which a conductor is wound in an oval spiral shape, a substantially σ-shape is formed in the middle of both longitudinal ends of the saddle-shaped coil to divide the conductor row into a plurality of parts. By forming a shaped gap and inserting a spacing piece into this gap, it is easy to shape the conductor, reduce the electromagnetic force applied to the conductor at both ends, and firmly connect the conductors at both ends to ensure that the conductor is always in the specified position. It is a saddle-shaped coil that can generate a magnetic field of .

Furthermore, the third aspect of the present invention is a method for manufacturing a saddle-shaped coil in which a conductor is wound in an oval spiral shape, in which a substantially σ-shaped conductor row is divided into a plurality of parts in the middle of both longitudinal ends of the saddle-shaped coil. By forming a shaped gap, inserting a gap piece into this gap, and manufacturing this gap piece by cutting from a tubular material, it is easy to manufacture the gap piece that connects the conductors at both ends, and the specified gap is always maintained. This is a method for manufacturing a saddle-shaped coil that can easily produce a saddle-shaped coil that generates a magnetic field.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the saddle-shaped coil of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a saddle-shaped coil according to the present invention, and FIG. 2 is a perspective view showing the saddle-shaped coil assembled to the outer periphery of a center pipe (not shown).

In FIGS. 1 and 2, the saddle-shaped coil 1 with the conductor wound 24 times has its inner side wound 5 times to form a convex portion 5A, and then the conductor is wound approximately 5 turns wide at both ends. It is wound eight times with a σ-shaped interval 5a to form a convex portion 5B, and further wrapped 11 times with an approximately five-turn interval 5b to form a convex portion 5C.

Further, spacer pieces 4A and 4B, which will be described later, are coated with epoxy resin on both end surfaces and inserted into the left and right gaps 5a and 5b, respectively, and are inserted into the inner sides of both ends of the oblong hole formed in the center. A key groove-shaped center pole 2 is inserted into each of the center poles, the outer periphery of which is coated with epoxy resin. Further, on the outside of the convex portions 5C at the left and right ends, an end block 3 having approximately the same shape as the conventional end block 13 shown in FIG. 5 is coated with epoxy resin and inserted under pressure. At the same time, they are inserted into a heating furnace under pressure using a pressure jig (not shown), and are hardened and bonded using an epoxy resin.

Here, as shown in FIG. 3, the center pole 2, end block 3, and spacing pieces 4A and 4B have the same inner and outer diameters as the inner and outer diameters of the saddle-shaped coil 1, and are made into a coil by crossing glass fibers. The spacer piece 4A shown in the figure is manufactured from a filament winding pipe 10 made of FRP made of epoxy resin by cutting using an NC processing machine.

FIG. 4(a) is a detailed plan view of the center pole 2, end block 3, and spacing pieces 4A, 4B, and FIG.
) is a front view of the same figure (a). In both figures, the curved surface 2a where the center pole 2 contacts the inner periphery of the center hole of the saddle-shaped coil 1 is on the cross-section of the center line 7A in FIG. The angle 9 formed between the center line 7B of 1 and the normal line 8 is inclined in the range of 30° to 45°. Hereinafter, the end block 3 and the spacing pieces 4A, 4B also have corners 9 inclined at 30° to 45°, as shown in the figure.

[0016] In the saddle-shaped coil constructed in this way, the difference in length between the inner circumference and the outer circumference of each conductor at both ends of the saddle-shaped coil 1 can be reduced, so forming becomes easier and forming accuracy is improved. However, the gaps formed between each layer can be reduced. In addition, the electromagnetic force applied to each conductor at the end can be reduced, and furthermore, the center pole 2 and the spacing pieces 4A, 4B inserted inside the convex portion 5A are in close contact with the conductor.
Since each convex portion 5A, 5B, 5C is firmly joined via epoxy resin, distortion due to electromagnetic force can be prevented.
Quench phenomenon can be prevented.

Furthermore, the center pole 2 and the spacing pieces 4A, 4
B and the curved surface in contact with the conductor of the end block 3 are made into a cylindrical filament winding pipe 1 by using NC tape processed from the jig for forming the saddle-shaped coil 1 shown in Fig. 1.
A large number of pieces can be easily manufactured from scratch in a short time.

In the above embodiment, an example was explained in which three convex portions 5A, 5B, and 5C were provided at each end of the saddle-shaped coil 1. 2 parts, 1 gap, or 4 convex parts,
3 gaps).

[0019]

[Effects of the Invention] As described above, according to the first invention, in a saddle-shaped coil in which a conductor is wound in an oval spiral shape, a conductor row is divided into a plurality of conductor rows in the middle of both longitudinal ends of the saddle-shaped coil. By forming a substantially σ-shaped gap, the conductor can be easily formed and the electromagnetic force applied to the conductor at both ends is reduced, thereby obtaining a saddle-shaped coil that can prevent the quench phenomenon and always generate a predetermined magnetic field. be able to.

According to the second aspect of the present invention, in a saddle-shaped coil in which a conductor is wound in an oval spiral shape, the conductor row is divided into a plurality of approximately σ at the middle of both ends in the longitudinal direction of the saddle-shaped coil. By forming a letter-shaped gap and inserting a spacing piece into this gap, the electromagnetic force applied to the conductors at both ends is reduced and the conductors at both ends are firmly connected, preventing the quench phenomenon and always generating the specified magnetic field. A saddle-shaped coil can be obtained.

Furthermore, according to the third invention, in the method for manufacturing a saddle-shaped coil in which a conductor is wound in an oval spiral shape,
A roughly σ-shaped gap that divides the conductor row into multiple parts is formed between both longitudinal ends of the saddle-shaped coil, and a gap piece is inserted into this gap, and this gap piece is manufactured by cutting from a tubular material. By doing so, a gap piece that firmly connects the conductors at both ends can be easily manufactured, and a method for manufacturing a saddle-shaped coil that can easily manufacture a saddle-shaped coil that always generates a predetermined magnetic field can be obtained. .

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the first, second, and third inventions.

FIG. 2 is a perspective view showing an embodiment of the first, second, and third inventions.

FIG. 3 is a perspective view showing the effects of the first, second, and third inventions.

FIG. 4 is a partial detailed view showing an embodiment of the saddle-shaped coil of the first and second inventions and the method of manufacturing the saddle-shaped coil of the third invention.

FIG. 5 is an exploded perspective view showing an example of a conventional saddle-shaped coil.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Saddle-shaped coil, 2... Center pole, 3... End block, 4A, 4B... Spacing piece, 5A, 5B, 5C... Convex part.

Claims (3)

[Claims] [Claim 1] In a saddle-shaped coil in which a conductor is wound in an oval spiral shape, a substantially σ-shaped gap is formed between both longitudinal ends of the saddle-shaped coil to divide the conductor row into a plurality of parts. A saddle-shaped coil featuring: 2. In a saddle-shaped coil in which a conductor is wound in an oval spiral shape, a substantially σ-shaped gap is formed between both longitudinal ends of the saddle-shaped coil to divide the conductor row into a plurality of parts, A saddle-shaped coil characterized by having a spacing piece inserted into this gap. 3. A method for manufacturing a saddle-shaped coil in which a conductor is wound in an oval spiral shape, wherein a substantially σ-shaped gap is formed between both longitudinal ends of the saddle-shaped coil to divide the conductor row into a plurality of parts. A method for manufacturing a saddle-shaped coil, characterized in that a gap piece is inserted into this gap, and the gap piece is manufactured by cutting from a tubular material.