JP3202664B2 - Manufacturing method of hollow coil and electromagnet using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tube structure, a method for manufacturing a hollow coil, and an electromagnet using the coil.

[0002]

2. Description of the Related Art A conventional DC electromagnet is manufactured by winding a copper pipe or a hollow conductor around a magnetic core made of a ferromagnetic material, also serving as a conductor and a cooling channel. in this way,
The copper pipe must be bent along the magnetic core, and the copper pipe does not bend in the shape of the magnetic core.
The dimensions of the completed coil are larger than the magnetic core. If this electromagnet is used as an accelerator internal electrode component such as a drift tube linac, the space occupied by the electromagnet in the internal electrode becomes excessively large, and the electrode size becomes large, thereby lowering the acceleration efficiency of the accelerator.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks, and provides a hollow coil which can provide a new tube structure and a compact electromagnet, and reduces the space occupied by the electromagnet in the accelerator. The purpose is to improve the acceleration efficiency of the accelerator.

[0004]

According to the present invention, in order to achieve the above object, a plurality of grooves are formed on a plurality of surfaces of a block-shaped base material, and each groove is formed so that a spiral shape is formed. The present invention provides a spiral pipe structure formed by connecting a plurality of holes, forming a lid on the upper surface of a groove, and then processing a base material into a predetermined shape. Also, a plurality of grooves are formed on a plurality of surfaces of the block-shaped conductive material, the grooves are connected by a plurality of holes so that a spiral shape is formed, and a lid is formed on the upper surface of the groove. And a method for manufacturing a hollow coil, wherein the hollow coil is processed into a predetermined shape. Further, the present invention provides a method for producing an inner hollow coil, wherein the lid is formed by electroforming, and an electromagnet, wherein a magnetic material is provided on the coil produced by the method. It is.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A manufacturing process of a pipe structure, for example, a hollow coil will be described with reference to FIGS. FIG. 1 (a)
In (d), grooves 2 are machined on two opposing surfaces of a copper block 1, and each end of these grooves 2 is connected with a drill hole 3. At this time, the angle of the groove 2 on one surface and the groove 2 on the other surface is shifted by one groove. As a result, these grooves 2 and drill holes 3
Leads to one line (FIG. 1 (b)). When a lid 4 is formed on the grooved surface by a copper electroforming method and the groove 2 is covered, a spiral hollow portion 5 is formed inside the copper block 1 (FIG. 1C). Next, the central portion 6 (the portion surrounded by the groove 2 and the drill hole 3) of the copper block 1 is hollowed out, and the copper block 1 is further cut away leaving the peripheral portion of the hollow portion 5 to obtain a hollow coil 7. (Figure 1
(D)).

[0006] The step of placing the lid 4 in the groove 2 by copper electroforming is shown in FIG.
(A) to (e). That is, first, wax 8 is filled in the groove 2 (FIGS. 2A and 2B), and a metal powder, for example, silver powder 9 is applied to the surface thereof (FIG. 2C), and electroforming (including finishing). After 10 (FIG. 2D), the wax 8 is removed (FIG. 2E). Wax removal is
Hot water, alkaline degreasing solution, or solvent is poured into the hollow portion 5 of the copper block. Thus, the hollow portion 5 is formed.

FIG. 3 shows an electromagnet using the hollow coil. A magnetic core 11 made of a ferromagnetic material is housed in a hollow coil 7 manufactured by a copper electroforming method. It is preferable to provide a spacer 12 for insulation between the hollow coils 7.
The difference between the conventional electromagnet and the electromagnet of the present invention is that the coil 7 is formed first, and the ferrite 11
Is inserted into an electromagnet and the coil is processed into a block by an electroforming method.

When the coil 7 is energized, the ferromagnetic core 1
1 is magnetized. Since the cooling water flows through the hollow portion 5 of the coil 7, it is possible to absorb Joule heat due to energization and load a large DC current. Since the coil 7 fits the outer diameter of the magnetic core 11, the coil 7 has a size slightly larger than the magnetic core 11 as a whole and is very compact.

In the above embodiment, a hollow coil using a copper block as a base material has been described. However, in the present invention, a pipe structure can be formed using an arbitrary material as a base material, and not only an electromagnet, It can be applied to other technical fields.

[0010]

According to the present invention, a hollow coil capable of providing a new tube structure and a compact electromagnet is provided, the space occupied by the electromagnet in the accelerator can be reduced, and the acceleration efficiency of the accelerator can be improved. .

[Brief description of the drawings]

1 (a) to 1 (d) are manufacturing process diagrams of a pipe structure of the present invention.

FIGS. 2 (a) to 2 (e) show a process of forming a hollow portion of a coil by copper electroforming using a copper block in the manufacturing process shown in FIGS. 1 (a) to 1 (d). FIG.

FIG. 3 is a perspective view of an electromagnet using the hollow coil of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Block 2 Groove 3 Drill hole 4 Lid 5 Hollow part 6 Central part 7 Hollow coil 11 Magnetic core

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshihiro Kawasumi 10 Oecho, Minato-ku, Nagoya City, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Nagoya Aerospace System Works (56) References JP-A-6-294482 (JP, A) JP-A-3-28592 (JP, A) JP-A-49-58175 (JP, A) JP-B-48-25214 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01F 41/04 H01F 7/06

Claims (3)

(57) [Claims] 1. A plurality of grooves are formed on a plurality of surfaces of a block-shaped conductive material, each groove is connected by a plurality of holes so as to form a spiral shape, and a lid is attached to an opening surface of the groove. A method for manufacturing a hollow coil, wherein a center portion of a conductive material is cut out, and a conductive material is cut into a coil shape while leaving a peripheral portion of a groove and a hole. 2. A method for producing a hollow coil according to claim 1, characterized in that the lid is formed by electroforming. Wherein the electromagnet, characterized in that the central portion of the coil formed I by <br/> to the production method described in claim 1 or 2, it was placed a magnetic material.