JPH01207903A - Sheet coil - Google Patents

Abstract

PURPOSE:To enable improved characteristics to be obtained and workability on assembly to be improved by forming each of wound electrically-conductive wire in a sheet shape and by fixing it with adhesive. CONSTITUTION:With a sheet-shaped coil 2b formed in rectangular form, each electrically-conductive wire is forcedly adhered by epoxy resin, etc. Which is adhered to the minimum. The thickness of this electrically-conductive wire is limited to that which is allowed to change freely in horizontal direction. This change has a mechanical plasticity and hence magnetic device can be assembled without applying any reinforced pressure by means of a press, etc. Thus, nearly no distortion is generated in coil itself. It allows a coil to be mounted easily regardless of complex configuration and assembly to be made easily.

Description

[Detailed Description of the Invention] [Purpose of Purpose] (Field of Industrial Application) The present invention is a sheet-like coil, which is suitable for magnetic field correction of %G superconducting coils and steering of gyrotron magnets. .

(Prior art) Various structures of conventional coils of this type have been proposed. For example, as shown in FIG. 8, the coil I) is formed into a predetermined shape, such as a rectangular donut shape, and then molded into a saddle shape. However, such a coil has the following drawbacks. In other words, a planar coil formed into a planar shape is molded into a cylindrical shape using a metal mold, but in this case, distortion occurs during molding. This distortion often occurs over time after being installed in the device, making maintenance difficult.Since most of these coils are bonded to resin, it is possible that this resin may be undesirably bonded. It often deforms and becomes distorted, causing cracks.

Furthermore, if the adhesive used to bond conductive wires or the fiber material used to improve adhesive strength becomes thicker than necessary, the adhesive will become a hindrance when molded into a predetermined shape, causing molding distortion. .

This phenomenon appears conspicuously at the corners of the wound conductive wire.

Furthermore, the arc portion of the shaped hollow-shaped coil is often used for M@, but this portion tends to be difficult to form the coil required to generate the prescribed magnetic field in the conventional field & G2. For example, if it is necessary to reduce the thickness of the coil in the radial direction, but this becomes impossible, or if a current of about IOA is required, the number of turns of the coil is large and the central magnetic field G is thick, reaching several hundred turns. There may be cases where
There are various drawbacks such as poor workability, problems with spraying of the finished coil, and undesirable damage to the installed coil due to its electromagnetic force.

(Problems to be solved by the invention) The present invention aims to solve the above-mentioned conventional problems.
Provides a sheet-like coil in which the shape of the effective part of the coil can be formed into a predetermined shape, and the finished coil fits well into the equipment in which it is assembled, is stable against electromagnetic force, and the thickness of the coil can be made sufficiently thin. do.

[Structure of the invention]

(Means for solving problems) The present invention suppresses the horizontal thickness of the coil to approximately several mm, uses the minimum amount of adhesive, and maintains mechanical plasticity in the plane direction of the completed coil. &C configuration.

That is, the conductive edges of the sheet-like coil formed in a rectangular shape, for example, are firmly joined to each other by a minimum amount of adhesive such as epoxy resin.

The thickness of this conductive wire is limited to G, which is such that it can be freely changed in the plane direction. This change is caused by mechanical plasticity (the coil as a whole maintains its original shape, while its shape can be freely changed in the plane direction by its own weight or by slight pressure).

), and therefore the magnetic device can be assembled without applying any forced pressure such as a press, so the coil itself is characterized by almost no distortion. Therefore, even if the coil has a complicated shape, the coil can be easily attached, so that assembly can be facilitated.

(Function) As described above, the sheet-like coil of the present invention limits the coil thickness to several mm or less, preferably in the range of about 2.0 mm to 0.5 mm, and is formed while maintaining mechanical plasticity. Since it has almost no distortion, it has a sufficient degree of freedom for changes in the plane direction, and as a result, even if it is attached to the coil winding frame, it will change due to its own weight, so no distortion will occur due to changes. . In addition, the winding frame and the coil fit together extremely well, and there is almost no change in magnetic properties over time due to the movement of the coil due to electromagnetic force after installation.

Furthermore, since the degree of freedom of the coil has been greatly improved compared to conventional coils, the assembly work is dramatically easier, and the workability is good and practical.

(Example) FIG. 1 is a front view of a sheet-like coil of the present invention, in which NbT
A conductive wire 2 of about 0.25 mmφ, which is an i-based superconductor, has a predetermined width of about 15 mm, thickness of about 1 mm, and length of about 350 x 700 mm.
A rectangular sheet-like coil 261 mm in diameter is formed.

This sheet-like coil is made with extremely accurate straightness on the outside.

The sheet-like coil formed in this manner can be curved in the horizontal direction to form a saddle shape, as shown in FIG. Although this curvature can be achieved by simply aligning the cylinder with its own weight, for example, as shown in FIG. Its position can be adjusted by fitting it.

FIGS. 4 and 5 are for explaining the state of change of the sheet-like coil of the present invention, which bends by simply placing it on a circular support. Alternatively, it has characteristics that can be sufficiently applied as a wavy coil.

FIG. 6 explains the method for manufacturing the sheet-like coil of the present invention, in which an adhesive discharge port 5 is formed at the lower Q of the hopper 4 holding the adhesive 3, and the adhesive 3 is almost naturally discharged from the discharge port 5. It is designed to be discharged in a state. Reference numeral 6 denotes a guide roller for adjusting the conductive wire 2 to a predetermined position, and the conductive wire passes along the surface of this guide roller. A coil forming device is formed by providing a winding frame 1 installed at a predetermined distance from the guide roller 6. Note that 2a is a spool around which conductor #I2 is wound.

First, the tip of the conductive wire 2 wound around the spool 2a is fixed to the winding frame 1, and then slowly rotated.

At this time, the conductor 41!2 is coated with the adhesive 3 and the winding frame 1
ζThus, as it is gradually wound up, the conductive edges are simultaneously glued to each other with a matte adhesive, and then the conductive edges are rolled up to a predetermined size (
The sheet-shaped coil 2b is formed by winding the coil until it has a width of about 25 mm and about 130 turns.

The sheet-shaped coil 2b formed in this manner is corrected by a correction device 8 for making the outer periphery of the coil linear, as shown in FIG. That is, the corrective element 8a has holes 9, 9, and the corrective element 8a has holes 9,9.

10, it is fixedly formed so as to be movable so as to slide in the direction of arrow 11. This movement is performed by the arm 12. In this correction means, the coil 2b is held at about 100"C and left for about 5 hours. The correction element 8a is moved to squeeze out the excess part of the adhesive 3, and at the same time, the outer shape of the coil is changed. A straight portion is formed and cured to form a sheet-like coil.

〔Effect of the invention〕

As described above, the present invention is formed by attaching an extremely thin layer with a thickness of several millimeters, for example, and the magnetically effective portion is formed while maintaining linearity, so that extremely high characteristics can be obtained. Furthermore, since the amount of adhesive is kept to the minimum necessary and there are no undesirably thick parts, there is no cause for cracks to occur due to this, and therefore, there is almost no change in magnetic properties over time.

Furthermore, since the curved coil is deformed almost entirely by its own weight, there is almost no formation strain, and there is no characteristic deterioration associated with this.

Furthermore, it is extremely easy to form a curve, and when it is curved, it can be installed completely flush with the support, so that the coil will not be undesirably moved by electromagnetic force.

The sheet-shaped coil of the present invention is extremely effective as a magnetic field correction coil for a superconducting coil for MRI, a coil for magnetic fine adjustment such as a stearinda coil for a superconducting magnet for a gyrotron.

[Brief explanation of the drawing]

1 to 5 are a front view and a perspective view of the sheet-like coil of the present invention, FIGS. 6 and 7 are explanatory views explaining the manufacturing method thereof, and FIG. 8 is an explanatory view of a conventional sheet-like coil. be. 2b... Sheet-like coil. Agent Patent Attorney Noriyuki Chika Yudo Hikaru Matsuyama 2 Figure 1 Figure 2

Claims (7)

[Claims] (1) In a coil formed by winding one or more conductive wires, each of the wound conductive wires is formed into a sheet shape and fixed with an adhesive while maintaining mechanical plasticity. A sheet-like coil characterized by (2) The sheet-like coil according to claim 1, wherein at least an outer surface of the rectangular coil is formed with linearity. (3) The sheet-like coil according to claim 2, wherein the rectangular coil is configured in a pair of saddle shapes. (4) The sheet-like coil according to claim 1, wherein the conductive wire is formed of a superconductor wire. (5) The sheet-like coil according to claim 3, wherein the conductive wires connecting each coil are connected in a non-inductive state. (6) After the conductive wire is wound into a predetermined shape, it is heated at the same time as straightening, and the adhesive is cured and the adhesive is regulated to the minimum amount necessary for bonding the conductive wire. The sheet-shaped coil described. (7) The sheet-like coil according to claim 1, wherein the conductive wire constituting the coil is formed of a superconducting wire.