JPS62111404A - Manufacture of sheet coil - Google Patents

Abstract

PURPOSE:To obtain a sheet coil fitting the shape of an object to be mounted by forming the resin between conductive wire materials into a desired shape with the resin being half-cured, and performing the final curing after the formation. CONSTITUTION:A sheet coil 11 consists of conductive wire materials 12 which were wound so as not to be in contact with each other and the resin impregnated between said conductive wire materials 12. If resin such as epoxy resin has been previously deposited around the conductive wire materials 12, it is directly half-cured, and if weldable varnish, glass tape or the like is used, resin such as epoxy resin is further impregnated in the wound body and half-cured. With the resin being half-cured, it is formed into a final shape, and the resin is cured, thereby obtaining the sheet coil 11 of a desired shape.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a sheet-like coil formed by winding a conductive wire into a sheet-like shape, and for example, a method for manufacturing a sheet-like coil formed by winding a conductive wire in a sheet-like manner.
The present invention relates to a method of manufacturing a sheet-like coil used as a magnetic field correction coil fixedly provided to energize a magnetic field in a magnet that generates a highly uniform magnetic field, such as a superconducting magnet used in spectral analysis.

[Conventional technology] In order to increase the resolution of NMR spectrum analyzers,
Superconducting magnets are used. However, in order to increase the resolution, the magnetic field formed by the superconducting magnet must be uniform, so conventionally, as shown in Fig. 2 was extrapolated from the reel 3 on which it was wound.

This auxiliary coil 2 is fixed to the outer peripheral surface of the winding frame 3 as shown in the figure. ! It is formed by winding a conductive wire around several bottles 4.

[Problems to be Solved by the Invention] However, the auxiliary coil 2 can only be wound over the outer peripheral surface of the winding frame 3, and cannot be wound along the outer peripheral surface of the winding frame 3. Therefore, it is difficult to construct an m-field correction coil that conforms to the shape of the main coil 1, that is, is suitable for correcting the magnetic field. In addition, in order to configure the auxiliary coil 2 around a small number of bottles 4, it is necessary to move the auxiliary coil 2 in a three-dimensional direction.
There was also the problem that a winding machine capable of JJ was required, resulting in high manufacturing costs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for manufacturing a coil at low cost that can match the shape of the part to which it is attached and is therefore suitable for magnetic field correction.

[Means for Solving the Problems] The present invention provides a method for manufacturing a sheet-like coil that solves the above-mentioned problems and includes the following steps.

In other words, there is a process of winding the conductive wires into sheets so that they do not touch each other, a process of attaching resin to the conductive wires, and a process in which the resin between the conductive wires wound into sheets is semi-hardened. This method includes a step of molding the molded material into a desired shape while it is still in use, and a step of completing final curing after molding.

[Function] In the present invention, the conductive wire wound into a sheet shape is molded into a desired shape before the resin is finally cured, that is, in a semi-cured state. Therefore, for example, it is possible to form a sheet-shaped coil along the outer peripheral surface of the main coil 1 shown in FIG. 2, and after such molding, curing of the resin is completed. Therefore, it is possible to obtain a sheet-like coil that matches the shape of the object to be attached.

Moreover, since the conductive wire is wound into a sheet, a winding machine that can move three-dimensionally is not required, and it can be manufactured at low cost using a simple winding machine.

[Description of Embodiment] FIG. 1 is a perspective view showing a sheet-shaped coil according to an embodiment of the present invention. This sheet-like coil 11
consists of conductive wires 12 wound so as not to touch each other, and a resin impregnated between the 3S conductive wires 12.

Although it is not necessarily clear from FIG. 1, the conductive wire 12 is not stacked in the thickness direction, that is, from the inner circumference to the outer circumference of the sheet-shaped coil 11.
It is heavily wrapped. Further, the sheet-like coil 11 is curved in its short side direction in order to match the outer circumference of the main coil 1 shown in FIG. 2. Because of this shape, the sheet-like coil 11 can be easily attached to a desired position on the outer peripheral surface of the main coil 1. Therefore, the magnetic field can be corrected accurately without increasing the outer size of the main coil 1 very much.

Next, an embodiment of the present invention for obtaining the sheet-like coil 11 shown in FIG. 1 will be described. First, a winding frame 21 (not shown in FIGS. 3 to 5) is prepared. The winding frame 21 is placed on the shaft 22,
It has a pair of plates 24 and 25 fixed to face each other with a gap 23 in between. This gap 23 is set to have a width that is equal to or slightly wider than the outer diameter of the conductive wire 12 shown in FIG. This is because the S conductive wire is wound using this gap 23 so that the conductive wire does not overlap in the thickness direction.

In the gap 23, a winding core 26 is fixed on the shaft 22, as clearly shown in FIGS. 4 and 5. Therefore, the width of the above-mentioned gap 23 is determined by the thickness of the winding core 26. The cross-sectional shape of the winding core 26 is approximately rectangular as shown in FIG. 5, but this may be changed as appropriate depending on the shape and size of the product to be attached.

In this embodiment, as shown in FIG. 6, the conductive wire 12 is wound around the winding core 26 within the gap 23 of the winding frame 27 shown in FIGS. 3 to 5. In this case, in order to prevent the conductive wires 12 from coming into direct contact with each other, the conductive wires 12 may be coated with a resin such as fusible varnish or epoxy resin in advance, or glass tape or glass thread may be used to make the conductive wires 12 conductive. It is wound around the outer periphery of the wire rod 12. The thus prepared i# electrical wire 12 is wound around the winding core 26 using a normal two-dimensionally movable winding machine as described above.

Next, if a resin such as epoxy resin has been applied around the conductive wire 12 in advance, the F! When A@ type varnish or glass tape is used, the wound body is further impregnated with a resin such as epoxy resin to bring it into a semi-cured state. The sheet in this state is shown in FIGS. 7 and 8. Further, in a semi-cured state, it is molded into the shape shown in FIG. That is, the resin is molded into the final shape in a semi-cured state.

Thereafter, the resin is finally cured to form a coil 11 having a desired shape as shown in FIG.

Note that, prior to or after the final curing, resin may be further replenished for reinforcement, or a reinforcing tape made of glass tape or the like may be attached.

Note that as the conductive wire 12, a wire made of any conductive material such as a normal copper wire can be used, and an enameled insulated wire commonly used for coils can also be used.

Next, a specific experimental example will be explained.

An enameled insulated wire with a diameter Q of 5 mm was prepared, and while an epoxy resin was applied around the enameled insulated wire, winding was performed using a winding core having a cross-sectional shape shown in FIG. In the obtained wound body, the enameled insulated wire was wound in one layer in 58 rows. This was cured and molded at a temperature of 50° C. for 2 and a half hours, and a flat sheet-like coil was formed using IU. Next, the sheet-like coil was bent so that the angle α shown in FIG. 1 was 120' and held at a temperature of 120'C for 5 hours to form a final hardening.

As a result, a magnetic field correction coil with high strength and a desired shape could be obtained.

[Effects of the Invention] In the present invention, the resin between the conductive wires wound into a sheet is molded into a desired shape in a semi-hardened state, and final hardening is performed after molding. Therefore, it is possible to easily obtain a sheet-like coil that corresponds to the shape of the member to which it is attached, such as a magnetic field correction coil for NMR, for example. especially,
Since the conductive wire is wound into a sheet, there is no need to use a complicated winding machine, and winding can be done using a single ordinary unidirectional winding machine, which reduces manufacturing costs effectively. can be reduced to

The present invention is applicable not only to magnetic field correction coils used in superconducting magnets for NMR as described above, but also to general applications that require a sheet-like coil of a desired shape. It should be pointed out that this can be applied to magnetic field correction coils, etc.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a sheet-like coil obtained according to an embodiment of the present invention. FIG. 2 is a perspective view for explaining an example of a conventional magnetic field correction coil. Figures 3 to 5 are diagrams for explaining a winding frame used in an embodiment of the present invention, in which Figure 3 is a perspective view of the winding frame, Figure 4 is a side view, and Figure 5 is a side view of the winding frame. 5 is a sectional view taken along line V-V in FIG. 4. FIG. FIG. 6 is a sectional view for explaining the process of winding the conductive wire around the winding frame shown in FIGS. 3 to 5. FIG. FIG. 7 and FIG. 8 are a plan view of the sheet-like coil obtained by winding and an enlarged sectional view taken along the line ■-■ in FIG. 7. FIG. 9 is a cross-sectional view for explaining the shape of the winding frame used in the specific experimental example. In the figure, 11 is a sheet-like coil, 12 is a conductive wire, and 21 is a winding frame. z5 ＼ Hanging 4 Figures Sotsu Yuka ■→ Vase figure, 1cm

Claims (7)

[Claims] (1) A step of winding the conductive material into a sheet shape so that they do not touch each other, a step of attaching a resin to the conductive wire material, and a step of semi-curing the resin between the conductive wire materials wound into the sheet shape. A method for manufacturing a sheet-like coil, comprising a step of molding it into a desired shape in a state, and a step of completing final curing after molding. (2) The method for manufacturing a sheet-like coil according to claim 1, wherein the step of attaching resin to the conductive wire is performed prior to the winding step. (3) The method for manufacturing a sheet-like coil according to claim 1, wherein the step of attaching resin to the conductive wire is performed after the winding step. (4) The sheet-like coil is a magnetic field correction coil fixed to a magnetic field generating magnet for magnetic field correction, and the desired shape is a shape that follows the shape of the magnet. A method for manufacturing a sheet-like coil according to any one of items 1 to 3. (5) The method for manufacturing a sheet-like coil according to any one of claims 1 to 4, wherein the sheet-like coil is reinforced before or after final curing. (6) The method for manufacturing a sheet-like coil according to claim 5, wherein the reinforcement is performed by replenishing resin. (7) The method for manufacturing a sheet-like coil according to claim 5, wherein the reinforcement is performed by pasting a reinforcing tape.