JPS61216409A - Ring core - Google Patents

Abstract

PURPOSE:To simplify a manufacturing process, and to mass-produce the title cores by impregnating the inside of a core case with a resin under the state in which a roll body on which a magnetic material sheet is wound is arranged into the core case. CONSTITUTION:A roll body 1 in which a magnetic material sheet 10 consisting of an amorphous magnetic material, permalloy, a silica steel plate, etc. is wound and an end section is fixed through spot welding, etc. is prepared, and placed into a core case proper 12 made of an insulating resin. Varnish or an insulating resin such as epoxy is casted into the core case proper 12, the roll body 11 is impregnated with said resin, and the roll body is covered with a core case cover body 14 made of the insulating resin after an impregnation with the resin. The core case cover body 14 is fitted, the roll body 11 is cut together with the core case to form a gap 15, and a nonmagnetic spacer 16 is inserted into the gap 15, and fixed with a resin, etc. Accordingly, a manufacturing process is simplified, thus improving mass productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an annular core suitable for a magnetic core such as a normal mode choke coil.

(Prior art) Conventionally, this type of annular core has been produced by winding a magnetic sheet 1 in an annular shape as shown in FIG. A gap 3 is formed in the roll body 2 as shown in FIG.
It had an integrated configuration with B covered over it.

(Problems to be Solved by the Invention) By the way, the conventional annular core requires a step of impregnating the roll body 2 with resin in advance, so the workability is extremely poor.
There were problems with mass production.

(Means for Solving the Problems) In view of the above points, the present invention aims to provide an annular core that can simplify the manufacturing process and is excellent in mass productivity.

The present invention solves the above-mentioned problems by impregnating a roll body with a magnetic sheet wound thereon in a core case while being placed in a core case.

(Function) In the present invention, a roll body in which a magnetic sheet is wound
, - are impregnated with resin while placed in the core case, and workability is much better than in the conventional case where the roll body is impregnated with resin in advance.

(Example) Examples of the annular core according to the present invention will be described below with reference to the drawings. - Figures 1 to 5 show a first embodiment of the present invention.

In this first embodiment, first, as shown in FIG. 1, a roll body 11 is created by winding a magnetic sheet 10 such as amorphous magnetic material, permalloy, silicon steel plate, etc. and fixing the ends by spot welding or the like. It is placed inside the core case body 12 made of insulating resin. Here, the core case body 12 has, for example, a fitting step 13 formed at the opening edge.

Then, as shown in FIG.
1 is impregnated with the resin. After resin impregnation, an insulating resin core case lid 14 is placed on top.

The core case lid 14 is adapted to fit into the fitting step 13.

After fitting the core case lid 14, the roll body 11 is cut together with the core case to form a gap 15, as shown in FIG.
form. Then, a nonmagnetic spacer 16 is inserted into the gap 15 as shown in FIG. 4, and fixed with resin or the like. Here, the reason why the spacer 16 is arranged in the gap 15 is to prevent the dimension of the gap 15 from changing.

FIG. 5 is a cross section of the roll body 11 and the core case portion, and shows that the core case lid body 1 is attached to the stepped portion 13 of the core case body 12.
4 shows a fitted state.

According to the first embodiment, the resin impregnation of the roll body 11 is as follows:
Since this is carried out by resin casting the core case body 12 while it is placed inside the core case body 12, workability is extremely good and mass productivity can be improved. Further, since the core case body 12 and the core case lid 14 are structured to fit each other, it is possible to prevent the opening of the core case body 12 from being turned over and deformed.

6 to 8 show a second embodiment of the present invention.

In this second embodiment, a roll body 11 wound with a magnetic sheet 10 is placed on an insulating resin core case body 12A, an insulating resin is cast in this state, and the resin is poured onto the roll body 11. After impregnating and before covering with a lid, the roll body 11 is cut together with the core case body 12A to form a gap 15A as shown in FIG. Then, a non-magnetic spacer 16A is inserted into the gap 15A as shown in Figure 7, and fixed with resin or the like. Then, the core case lid 14A is placed on the roll body 11.

FIG. 8 is a cross section of the roll body 11 and the core case portion, showing the opening of the core case body 12A and the core case lid 14.
At' indicates a closed state. In this case, the core case lid 14A may be fixed with an adhesive or the like, and there is an advantage that the core case lid 14A can be easily attached.

In the above embodiment, the roll body 11 is annular, but it is also possible to use an elliptical roll or an oblong roll with a partially straight line.

(Effects of the Invention) As explained above, the annular core of the present invention has a structure in which a roll body wound with a magnetic sheet is impregnated with resin while being placed inside the core case. It is possible to simplify the process and improve mass productivity.

[Brief explanation of the drawing]

1 to 3 are exploded perspective views illustrating a first embodiment of the annular core according to the present invention, FIG. 4 is a perspective view of the same, FIG. 5 is a partial sectional view of the same, and FIGS. 6 and 7. is an exploded perspective view illustrating a second embodiment of the present invention, FIG. 8 is a partial sectional view thereof, FIG. 9 is a perspective view illustrating a conventional annular core, and FIGS.
The figure is an exploded perspective view. 1.10...Magnetic sheet, 2,11...Roll body, 3.15,15A...Gap, 4,16,16A
... Spacer, 12.12A ... Core case body,
14, 14A... Core case lid body.

Claims (1)

[Claims] (1) An annular core comprising a core case and a roll body in which a magnetic sheet impregnated with resin is wound around the core case, and a gap is formed in the roll body.