JPH0247097B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a method of manufacturing an electromagnetic coil in which a metal plate is used as a conductor and the shape of the conductor is efficiently formed into a sector shape in order to flow a large current.

For example, a research facility called Linac has been proposed as a beam acceleration system for elementary particles such as protons at various research institutions. Of these, 4 are used for beam focusing.
Polar magnets are used, but electromagnetic type, permanent magnet type, etc. have been proposed for this 4-pole magnet, but while this 4-pole magnet requires a large magnetic field gradient for the magnetic poles, it also requires a minimum installation space. One of the requirements is to limit the

For this reason, the electromagnetic type requires a large current to be passed through the coil to generate a large amount of porcelain. In this case, the magnetic field gradient in the quadrupole magnet will necessarily increase accordingly.

In view of this point, the present invention has a limit to the current that can be passed through conventional wire winding.
It is constructed with a metal plate with a large cross-sectional area to allow a larger current to flow, the outer periphery of the 4-pole magnet is circular to improve the efficiency of the 4-pole magnet, and a laminated metal conductor for the coil is used to further improve electromagnetic efficiency. The main purpose is to propose a manufacturing method that can greatly improve the conventional installation space by molding all the parts into fan shapes with the same curvature.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a molding apparatus suitable for use in the method of the present invention. Reference numeral 6 denotes a lower mold, in the center of which a support rod 2 with a predetermined curvature is attached horizontally, and on the upper part of the lower mold 6, as will be described later, a metal plate coil 1 to be formed is mounted. be touched. Then, an upper mold 5 having a substantially circular recess 4 at the bottom is placed over the lower mold 6 so that the lower mold 6 and the upper mold 5 can be fixed together. Furthermore, as shown in FIG. 2, between the recess 4 of the upper mold 5 and the coil to be molded 1, a round bar for molding 3, which is longer than the length of the coil to be molded 1 and protrudes on both sides, is arranged, and a wedge-shaped rod is provided at both ends. A press mold 7 having a press part can be gradually inserted between two molding round bars 3. In this case, the curvature of the radius of the pressing rod 2, the thickness of the coil to be molded 1, and the diameter of the round bar 3 is set to match the curvature of the recess 4 of the upper die 5.

Next, one embodiment of the method of the present invention will be described.
First, the to-be-formed coil 1 (temporarily fastened if necessary), which is made by successively laminating each coil metal plate and an insulator punched and molded into a rectangular shape, is placed on the backing rod 2 of the lower mold 6.
touches the top of the In this case, the stacked coils 1 to be formed are arranged to have an inverted trapezoidal cross section.
Next, as shown in FIGS. 1 and 2, the round bars 3A and 3B for molding are placed on top of the coil 1, the upper mold 5 is further placed, and the round bars 3A and 3B for molding are placed on the upper part of the coil 1. 3
Set it so that it is spaced between B. In this case, it can be tightened with bolts. Then, as the push die 7 enters, the round bars 3A, 3B for forming are gradually formed.
By widening the interval along the concave portion 4 of the upper mold 5, the coil 1 to be molded is gradually bent into an arc shape along the curvature of the support rod 2, and finally, as shown in FIG. The to-be-molded coil 1 is finished to have a fan-shaped cross section. This type of curvature can be simply applied downwards using a press die, which is extremely easy to manufacture.

Although the metal plate to be formed has been described as having been pre-cut into a rectangular shape, it may be one in which a slit is cut in the middle of one (one layer) metal plate 30, as shown in FIG. It may also be molded and then slitted. and the opposing tongue piece 31
The winding start and the winding end are slightly bent and shifted, and the winding end 32 and the winding start 33 of the next layer are electrically connected in series by soldering (brazing, etc.), as shown in FIG. A predetermined number of turns of the coil may be obtained. An insulator will be inserted between them.

Of course, insulating plates made of polyimide resin or the like and having substantially the same shape as the metal plates are alternately inserted between the metal plates and the next metal plate. After that, the whole is temporarily fixed, and then immersed in an insulating resin to remove bubbles and harden it, and finish it as a gold mile.

As described above, according to the present invention, a pressing rod having a curvature is brought into contact with the bottom part of the coil metal plates laminated with an inverted trapezoidal cross section, two round rods are brought into contact with the upper part of the coil metal plates, Furthermore, an upper mold having a concave portion of the same curvature is placed, and the space between the two round bars is widened to form a fan-shaped inverted coil. Therefore, a fan-shaped coil to be formed can be easily formed using a simple jig. Molding becomes possible, improving production efficiency. Furthermore, the space efficiency of the beam focusing quadrupole magnet employing such a coil is improved.

[Brief explanation of drawings]

1 and 2 are views showing an embodiment of a manufacturing apparatus suitable for use in the method of the present invention, FIG. 3 is a view showing one process of the present invention, and FIGS. 4 and 5 are views showing a molded object. It is a figure showing an example of a coil. DESCRIPTION OF SYMBOLS 1...Non-molding coil, 2...Passing rod, 3...Round bar for shaping, 4...Recessed part, 5...Upper die, 6...Lower die, 7...Press die.

Claims (1)

[Claims] 1. A pressing rod having a curvature is brought into contact with the bottom of the coil metal plates laminated to have an inverted trapezoid cross section, two round rods are brought into contact with the top of the coil metal plates, and a concave portion with the same curvature is brought into contact with the top of the coil metal plates. A method for manufacturing an electromagnetic coil, characterized in that an upper die having a shape is placed thereon, and the space between the two round bars is widened to plastically form a fan-like shape. 2. The method of manufacturing an electromagnetic coil according to claim 1, wherein the coil metal plate is formed with a rectangular plane. 3 A slit is formed in the middle of the metal plate for the coil, through the slit, one of the opposing metal plates is started to wind, the other is the end of the winding, and the end of the winding and the beginning of the next layer are electrically connected to each other. A method for manufacturing an electromagnetic coil according to claim 2, in which the electromagnetic coils are laminated.