JPH05144646A - Amorphous magnetic-core transformer - Google Patents

Abstract

PURPOSE:To lessen a reduction in the magnetic characteristics of an amorphous magnetic-core transformer, in particular to stabilize small the noise of the transformer and to suppress the irregularity of the performance of the transformer by a method wherein the transformer is constituted into such a structure that the weight of a coil, which is applied to a magnetic core, is decreased to lessen a stress to be applied to the magnetic core and at the same time, the stress is prevented from concentrating on the yoke part and corner parts, which support the outside of the magnetic core and to which a weight is most applied, of the magnetic core. CONSTITUTION:An amorphous magnetic-core transformer is provided with a magnetic core 2 formed by winding an amorphous magnetic alloy thin strip, upper and lower fitments 3 and 4, a coil 1, coil support materials 5 and a band 6, the materials 5 are respectively arranged on the upper and lower parts of the coil 1 to support the coil 1, the core 2 is supported by the fitments 3 and 4, the coil 1 is supported by the fitments 3 and 4 via the materials 5, the whole body is fixed integrally by the band 6 to form as a device body and the device body is housed in a case 8 or is installed on a floor in such a way that it is supported on the sides more outer than the intersection points of the extension lines of the internal surfaces of magnetic legs with the fitment 4 on the extension lines.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A silicon steel sheet having a thickness of 0.25 to 1.0 mm is used as a magnetic core material of a conventional transformer, and the steel sheet has strength and is easy to handle. That is, the magnetic core of the silicon steel sheet had a small effect of the coating film on the surface and did not cause a decrease in magnetic characteristics and a small change in shape even when external stress was applied.

FIG. 5 shows a conventional magnetic core transformer formed by winding a silicon steel plate. In FIG. 5, reference numeral 24 is a lower metal fitting, 23 is an upper metal fitting provided with a mounting portion to the case 8, and the upper metal fitting 23 and the lower metal fitting 24 are connected by an upper and lower connecting plate 11. Reference numeral 5 is a rectangular coil support material which is a molding material such as a press board or polyester, and supports the coil 1 composed of a primary winding and a secondary winding from above and below. 20
Is a magnetic core formed by winding a silicon steel plate, 6 is an iron band, 2
Reference numeral 1 is an elastic body support made of a cork sheet.

When assembling the body, the coil 1 is mounted on the upper and lower metal parts 23 and 24 together with the magnetic core 20 through the upper and lower coil supporting members 5.
The coil 1 is assembled in the inner space of the magnetic core 20 via the insulating spacer 13, and the band 6 is placed along the magnetic core 20 and integrally fixed together with the upper and lower metal fittings 23 and 24. It was a body.

Since the magnetic core 20 has a large space factor and a large mechanical strength, it can be handled like a rigid body with almost no deformation with respect to stress such as coil weight, and has a small magnetostriction constant. However, the change in magnetic properties was small. Particularly for noise that is sensitive to stress, a container support 2 made of cork sheet is formed on the entire lower surface of the lower metal fitting 24.
Low noise could be realized by storing it in the case 8 or installing it on the floor.

[0006]

However, an amorphous magnetic core having a low iron loss formed by winding an amorphous magnetic alloy ribbon having a thickness of about 25 μm, which is 1/10 or less that of a conventional silicon steel sheet, is used. However, since the space factor is small and the magnetostriction constant is large, it is sensitive to stress, and there is a problem in that even if a small force is applied, the shape change and the magnetic characteristics are easily deteriorated. Further, it is particularly delicate with respect to noise, and there is a problem in that there is a large variation in the noise level in the method of accommodating in the case or installing on the floor via the elastic body over the entire lower surface of the lower metal fitting of the container.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to make noise of an amorphous magnetic core transformer small and stable, and to suppress variations in transformer characteristics.

[0008]

In order to achieve the above object, an amorphous magnetic core transformer of the present invention comprises a magnetic core formed by winding an amorphous magnetic alloy ribbon, an upper and a lower metal fitting, A coil, a coil support material, and a band, the coil support material is disposed above and below the coil to support the coil, and the coil is supported by the upper and lower metal fittings via the magnetic core and the coil support material. The entire body is integrally fixed with the band to form a body, and the body is stored outside the intersection of the extension of the inner surface of the magnetic leg and the lower metal fitting, and is stored in the case or installed on the floor. It is a thing.

[0009]

According to the above means, the weight of the coil applied to the magnetic core is reduced to reduce the stress due to the coil weight, and the outside of the magnetic core is supported so that the central portion of the lower metal fitting can be bent. Therefore, the stress is not concentrated on the yoke portion and the corner portion of the magnetic core, which is the heaviest, so that the deterioration of the magnetic characteristics can be reduced, especially the noise can be reduced, and the variation of the characteristics can be suppressed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1A and 1B show an embodiment of an amorphous magnetic core transformer of the present invention. FIG. 1A is a front partial sectional view and FIG. 1B is a side partial sectional view. In FIG. 1, the same members as those in FIG. 5 of the conventional example are denoted by the same reference numerals, and details thereof will be omitted. 1
Is a coil consisting of a primary winding and a secondary winding, 2 is a magnetic core formed by winding an amorphous magnetic alloy ribbon, and 3 and 4 are upper metal fittings which are magnetic core 2 supporting materials made of stainless steel or iron. Lower bracket, 5
Is a coil support material made of resin or press board, 6 is a body band, 7 is a body support made of a rigid body such as iron or resin, or an elastic body such as cork or rubber, 8 is a case, and 9 is a magnetic core. A core bobbin having a thickness of 1 to 5 mm, which is made of aluminum, stainless steel, iron or the like for supporting the internal shape, 10 is a protective material for the outer peripheral portion of the magnetic core having a thickness of 0.3 to 3 mm, such as a silicon steel plate, 11 is an upper and lower connecting plate, and 12 is Insulating oil such as mineral oil, 13 is a support spacer for insulating material such as rubber or resin or press board that supports between the coil 1 and the magnetic core 2, and 14 is for the magnetic core 2 and the upper metal fitting 3 and the lower metal fitting 4. Woven cloth mats such as polyethylene terephthalate (PET), paper with gaps, and elastic cushioning materials A and 15 such as silicon rubber are arranged between the magnetic core 2 and the coil supporting material 5. The cushioning material B is the same as the cushioning material A14.

To assemble the body, the core bobbin 9 is arranged inside the magnetic core 2, the upper metal fitting 3 and the lower metal fitting 4 are assembled via the cushioning material A14, and the core bobbin 9 is further assembled by the support spacer 13 and the coil 1. The coil 1 is assembled so as to support it, while the coil 1 is assembled so that the upper metal fitting 3, the lower metal fitting 4, and the coil supporting material 5 are arranged above and below the coil 1 so as to support the coil 1, and are integrally fixed by the body band 6. To do. Then, in order to maintain the whole shape, the upper and lower connecting plates 11 are fixed to form an amorphous core transformer body. The integrally fixed container is housed in the case 8 or installed on the floor so as to be supported by the container support 7 on the extension line of the inner surface of the magnetic leg and outside the intersection A of the lower metal fitting 4. By doing so, the weight of the coil 1 is hardly applied to the magnetic core 2, the stress applied to the magnetic core 2 is made small and equal, and the lower metal fitting is used to support the outside of the magnetic core 2 with the body support 7. Since the central portion of 4 is bent, and stress is not concentrated on the lower yoke portion 2a and the corner portion where the weight is the highest, it is possible to reduce deterioration of magnetic characteristics, particularly noise characteristics, and suppress variations in magnetic characteristics.

As shown in FIG. 2, the noise is lowered as the supporting position of the body is outside the magnetic core, and the noise characteristic is stabilized outside the intersection A between the extension of the inner surface of the magnetic leg and the lower metal fitting. The change in noise characteristics is small outside the intersection B between the extension line on the outside and the lower metal fitting.

In FIG. 3, reference numeral 16 is a rigid U-shaped support metal fitting made of iron, and 17 is a support of a cork sheet which is an elastic body. When the rigid body is arranged on the metal fitting side of the body and the elastic body is arranged on the floor 18 side, the noise is reduced most.

Further, in FIG. 4, reference numeral 19 denotes a metal fitting for fixing the front, rear, left and right of the body, which also serves as a support for the body and is welded to the case. Even if it is integrated with the lower metal part by welding, the same effect can be obtained. In addition, in the oil-filled transformer in which the body is housed in the case, the noise of 4 to 15 horns is lower than that in the case where it is not housed in the case.

[0016]

As is clear from the above description, the amorphous magnetic core transformer of the present invention reduces the weight of the coil applied to the magnetic core to reduce the stress applied to the magnetic core, and By supporting the outer side, the central part of the lower metal fitting is bent, and stress is not concentrated on the yoke part and the corner part where the weight is the most due to this, so the deterioration of the magnetic characteristics can be reduced and especially the noise can be reduced. Characteristic variations can be suppressed.

Further, in particular, a container support made by combining a rigid body such as iron or resin and an elastic body such as cork or rubber is provided with a rigid body on the metal fitting side of the container and an elastic body on the case or floor side. In this case, the noise can be reduced more than the above.

Further, since an iron plate can be welded to the lower metal fitting or the case as the body support, it can be easily realized.

[Brief description of drawings]

FIG. 1A is a front partial cross-sectional view of an amorphous core transformer according to an embodiment of the present invention. FIG. 1B is a side partial cross-sectional view of an amorphous core transformer according to an embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between noise and the body supporting position from the center of the magnetic core.

FIG. 3 is a view showing a container support in which a rigid body and an elastic body are combined.

FIG. 4 is a view showing a body support that also serves to fix the front, rear, left and right of the body.

FIG. 5 is a front partial cross-sectional view of a conventional transformer having a magnetic core formed by winding a silicon steel plate.

[Explanation of symbols]

 1 coil 2 magnetic core formed by winding an amorphous magnetic alloy ribbon 3 upper metal fitting 4 lower metal fitting 5 coil support material 7,19 body support material 8 case 9 core bobbin 11 upper and lower connecting plate 12 insulating oil

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromitsu Hara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A magnetic core formed by winding an amorphous magnetic alloy ribbon, upper and lower metal fittings, a coil, a coil supporting member, and a band, and the coil supporting member above and below the coil. The coil is arranged to support the coil, and the coil is supported by the metal fitting through the magnetic core and the coil support material, and the whole is integrally fixed with the band to form a body, and the body is formed on the inner surface of the magnetic leg. An amorphous magnetic core transformer characterized by being housed in a case or installed on the floor so as to be supported outside the intersection of the extension and the lower metal fitting. 2. The combination of a rigid body and an elastic body as the body support, the rigid body portion is provided on the metal fitting side, and the elastic body portion is provided on the case or floor side. Crystalline core transformer.