JP2679476B2 - Amorphous core transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amorphous magnetic core transformer having a magnetic core formed by winding an amorphous magnetic alloy ribbon.

[0002]

2. Description of the Related Art In recent years, amorphous magnetic alloy ribbons have been studied for stationary equipment such as transformers because of their low loss and good magnetic properties.

Conventionally, this type of amorphous magnetic core transformer is shown in FIG.
And there was a thing as shown in FIG. Hereinafter, the configuration will be described with reference to the drawings. As shown in the figure, a magnetic core 1 formed by winding an amorphous magnetic alloy ribbon having a thickness of 25 μm, a primary winding 2 and a secondary winding 3 wound around a magnetic leg 1 a of the magnetic core 1 The electromagnetic coil 4, the interlayer insulating material 5, the coil board 6 made of a press board, polyester or the like. In addition, since the magnetic core 1 has internal distortion in the untreated state, it is usually 3
Annealing is performed in nitrogen at 60 to 400 ° C. At this time, the magnetic core 1 is significantly embrittled, so that the ribbon may be broken during the work and metal powder may exist between the layers of the magnetic core 1.

[0004]

However, in the above-mentioned conventional structure, the metal powder mixed during the annealing process may come out from the inside of the magnetic core 1, and the magnetic core not covered by the electromagnetic coil 4 may be present. Regarding No. 1, by sealing the end face portion of the magnetic core 1 with paint or the like, it is possible to prevent the metal powder from coming out. However, since the space between the magnetic leg portion 1a of the magnetic core 1 and the coil winding frame 6 cannot be stitched, there is a gap between the magnetic leg portion 1a and the coil winding frame 6. Therefore, when the magnetic core 1 is used, metal powder is removed from the interlayer of the magnetic leg portion 1a. However, there is a problem that the oil circulates due to the oil and deteriorates the insulation performance of the amorphous magnetic core transformer.

An object of the present invention is to solve the above problems and to provide an amorphous magnetic core transformer in which metal powder does not come out from the layers of the magnetic core portion during use and insulation deterioration can be suppressed.

[0006]

In order to achieve the above object, the present invention provides a magnetic core formed by winding an amorphous magnetic alloy ribbon, and a coil winding frame provided on a magnetic leg portion of the magnetic core. An electromagnetic coil wound around the outer periphery of the coil winding frame, a sheet-shaped member is provided on a magnetic leg portion around which the electromagnetic coil of the magnetic core is wound, and the magnetic leg portion and the sheet-shaped member It has a structure in which a gap is filled with a porous member.

[0007]

In the above structure, since the porous member is filled in the gap between the magnetic leg portion and the sheet-like member, the porous member promotes the filter effect, and the metal powder is prevented from appearing on the surface of the magnetic core. Disappear.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In this embodiment, the same components as those shown in the above-described conventional example are denoted by the same reference numerals, and the description thereof will be omitted. The characteristic configuration of the present embodiment is that the magnetic leg 1a of the magnetic core 1 is provided with a sheet member 7, and the gap between the magnetic leg 1a and the sheet-shaped member 7 is filled with a porous member 8. That is, a heat-shrinkable material such as a press board, a polyester non-woven fabric, a polyester film, cross-linked polyethylene, or vinyl chloride is suitable for the sheet-shaped member 7 covering the outer peripheral portion of the magnetic leg portion 1a. In addition, the porous member 8 includes a ball mat (polyester non-woven fabric),
Ceramic wool, glass wool and the like are suitable. The porous member 8 is filled in the entire gap between the sheet-shaped member 7 and the magnetic leg 1a or in the vicinity of the end thereof.

In the above structure, since the porous member 8 is filled in the gap between the magnetic leg portion 1a and the sheet-like member 7, the porous member 8 penetrates between the layers of the magnetic core 1 by the filter effect. The powder will not come out on the surface of the magnetic core 1 due to the vibration.

FIG. 3 shows another embodiment. In each drawing, the same parts as those in the above-described embodiment are designated by the same reference numerals, and the difference is that the sheet member 7a provided on the magnetic leg portion 1a has a heat-shrinkable material at its edge portion, The porous member 8 is filled in the gap between the sheet la and the sheet upper member 7a. According to this structure, both edge portions of the sheet-shaped member 7a are contracted by heat, so that the porous member 8 is formed into the magnetic leg portion 1a.
The filter effect is increased by being pressed down.

Although the winding iron core method is described in the embodiments, the present invention is not limited to this, and the same can be applied to the stacked iron core method.

[0012]

As is apparent from the above embodiment, the amorphous magnetic core transformer of the present invention is provided with a magnetic core formed by winding an amorphous magnetic alloy ribbon and a magnetic leg portion of the magnetic core. A coil winding frame and an electromagnetic coil wound around the outer circumference of the coil winding frame, a sheet-like member is provided on the magnetic leg portion around which the electromagnetic coil of the magnetic core is wound, and the magnetic leg portion and the magnetic leg portion A porous member is filled in a gap between the sheet-shaped member and this structure, so that metal powder does not come out from the magnetic core portion during use, and insulation deterioration can be suppressed.

[Brief description of the drawings]

FIG. 1 is a partial sectional front view of an amorphous magnetic core transformer according to an embodiment of the present invention.

FIG. 2 is a sectional view of the amorphous magnetic core transformer taken along line AA in FIG.

FIG. 3 is a partial cross-sectional front view of an amorphous core transformer according to another embodiment.

FIG. 4 is a partially sectional front view of a conventional amorphous magnetic core transformer.

5 is a cross-sectional view of the amorphous core transformer taken along line BB in FIG.

[Explanation of symbols]

 1 magnetic core 1a magnetic leg 4 electromagnetic coil 6 coil winding frame 7 sheet-shaped member 8 porous member

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiromitsu Hara, 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-5-217760 (JP, A)

Claims (2)

(57) [Claims] 1. A magnetic core formed by winding an amorphous magnetic alloy ribbon, a coil winding frame provided on a magnetic leg portion of the magnetic core, and an electromagnetic coil wound around the outer circumference of the coil winding frame. An amorphous magnetic core transformer, comprising a sheet-shaped member provided on a magnetic leg portion around which the electromagnetic coil of the magnetic core is wound, and a porous member being filled in a gap between the magnetic leg portion and the sheet-shaped member. 2. The amorphous magnetic core transformer according to claim 1, wherein the sheet-shaped member provided on the magnetic leg portion of the magnetic core has a heat-shrinkable material at its edge.