JPH06151202A - Amorphous core - Google Patents

Abstract

(57) [Summary] [Structure] An amorphous iron core composed of an iron core frame and an amorphous cut iron core 4 formed by winding and laminating an amorphous magnetic alloy ribbon attached to the iron core frame,
An amorphous iron core, characterized in that the roll surface 8 of the amorphous magnetic alloy ribbon is arranged outside the iron core frame. [Effect] When the iron core of the transformer is formed of the amorphous cut iron core 4, the amorphous magnetic alloy ribbon is laminated so that the anti-roll surface 9 having a large tensile strength is on the inner side (iron core frame side). It is possible to prevent damage to the cut core during the winding insertion process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amorphous iron core in which an amorphous cut iron core formed by winding an amorphous magnetic alloy ribbon is mounted on an iron core frame.

[0002]

2. Description of the Related Art Fe-Si is used as a magnetic core material for transformers and the like.
Examples include crystalline alloys such as alloys and Fe-Ni alloys. However, the wound iron cores of these alloys have a problem in manufacturing because they have low strength and require careful attention to winding, and also have a problem that iron loss is not so small.

Amorphous magnetic alloys have excellent magnetic properties, and wound iron cores using them are known. According to Japanese Patent Laid-Open No. 60-100403, when a wound iron core is manufactured, the surface of the amorphous material having a positive magnetostriction having a high smoothness (the surface in contact with the cooling roll surface) can be wound inside. Have been described. This is because iron loss can be reduced by making the smooth surface inside.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to Japanese Patent No. 0403, the magnetic properties of the iron core can be improved, but such an amorphous magnetic alloy is brittle,
Particularly, in the case of a cut iron core, there is a problem that the iron core is easily damaged due to its brittleness.

An object of the present invention is to provide an amorphous iron core which prevents damage to the iron-based amorphous magnetic alloy material in an electric device such as a transformer using the amorphous cut iron core.

[0006]

Means for Solving the Problems The gist of the present invention for achieving the above object is an iron core frame and an amorphous cut iron core formed by winding and laminating an amorphous magnetic alloy ribbon attached to the iron core frame. The amorphous iron core is configured such that the roll surface of the amorphous magnetic alloy ribbon is located outside the core frame.

[0007]

As is well known, the production of the amorphous magnetic alloy ribbon is carried out by rapidly cooling the melt of the alloy by flowing it down onto the surface of the cooling roll rotating at a high speed. In the present invention, the surface in contact with the roll (roll surface) is laminated so as to be outside the core frame. That is, the amorphous magnetic alloy ribbon manufactured by the single-sided roll method, one side naturally contacts the cooling roll,
Its back surface does not contact the roll surface. The bending strength (indicated by the breaking bending diameter D ₁ ) when this amorphous magnetic alloy ribbon was annealed at a predetermined temperature and measured with the roll surface facing outward as shown in FIG. 1 is shown in FIG. Thus, there is a difference in bending strength (indicated by the breaking bending diameter D ₂ ) when the roll surface is measured inside.

The relationship between the above-mentioned D ₂ / D ₁ and the annealing temperature is shown in FIG. 3. As is clear from FIG. 3, the roll surface is inside as shown in FIG. It has been found that the bending strength is increased if it is configured so that force is applied and used. Although the reason for this is not clear, it is considered that the anti-roll surface can withstand the force in the pulling direction because the anti-roll surface has fine irregularities on the surface.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are explanatory views of the bending strength measurement of the amorphous magnetic alloy ribbon 1. FIG. 1 shows a state in which the roll surface 8 of the amorphous magnetic alloy ribbon 1 is outside and sandwiched between two parallel plates composed of a fixed plate 2 and a movable plate 3.
Then, pressure is applied through the moving plate 3 to measure the fracture bending diameter D _{1 at} which the amorphous magnetic alloy ribbon 1 is broken. Similarly, in FIG. 2, the fracture bending diameter D ₂ is measured with the roll surface 8 of the amorphous magnetic alloy ribbon 1 inside.

FIG. 3 is a graph showing the relationship between the ratio of both fracture bending diameters D ₁ and D ₂ and the annealing temperature.
The value of ₂ / D ₁ is smaller than 1. This indicates that the roll surface 8 should be bent outwardly, that is, the pulling force should be generated on the anti-roll surface 9.

FIG. 4 is a front view of the amorphous iron core of the present invention. The amorphous cut iron core 4 is laminated so that the roll surface 8 of the amorphous magnetic alloy thin ribbon 1 is on the outside of the iron core frame 5, and an enlarged view of a corner portion 6 surrounded by a circle is shown in FIG.

The corner portion 6 of the iron core 4 angled by annealing is subjected to a tensile force (f) on the anti-roll surface 9 when the cut iron core is opened as shown by the arrow in FIG. 5 in the winding insertion process. Although it occurs, it is possible to prevent the core from being damaged by configuring the anti-roll surface of the amorphous magnetic alloy ribbon 1 having a high tensile strength to be the inner side.

[0014]

According to the present invention, when the iron core of a transformer is formed from an iron-based amorphous alloy, the anti-roll surface of the amorphous magnetic alloy ribbon having a large tensile strength is located on the iron frame side (the roll surface side is the outside). Such a laminated structure has an effect of preventing damage to the amorphous cut iron core in the winding insertion process.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a method for measuring a fracture bending diameter D ₁ when a roll surface is on the outside.

FIG. 2 is an explanatory diagram of a method for measuring a fracture bending diameter D ₂ when the roll surface is inside.

FIG. 3 is a graph showing the relationship between fracture bending diameter D ₂ / D ₁ and annealing temperature.

FIG. 4 is a front view of the amorphous iron core of the present embodiment.

5 is an enlarged view of the amorphous core corner portion of FIG.

[Explanation of symbols]

1 ... Amorphous magnetic alloy ribbon, 2 ... Fixed plate, 3 ... Moving plate, 4 ... Amorphous cut iron core, 5 ... Iron core frame, 6 ... Corner part, 8 ... Roll surface, 9 ... Anti-roll surface.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoyuki Sawaguchi 46 Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata Prefecture 1 Nakajo Plant, Hitachi, Ltd. (72) Inventor Yasutomo Imai 2-4-1 Nishizajigaoka, Chofu-shi, Tokyo No. Tokyo Electric Power Co., Inc. Technical Research Institute (72) Inventor Shoichiro Eren 2-4-1 Nishitsutsujigaoka, Chofu-shi, Tokyo Tokyo Electric Power Co., Inc. Technical Research Institute

Claims (1)

[Claims] 1. An amorphous iron core comprising an iron core frame and an amorphous cut iron core formed by laminating amorphous magnetic alloy ribbons mounted on the iron core frame,
An amorphous iron core, wherein the roll surface of the amorphous magnetic alloy ribbon is laminated outside the iron core frame.