JP2987538B2 - 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 wound with an amorphous magnetic alloy ribbon.

[0002]

2. Description of the Related Art As a conventional magnetic core material of a transformer, a silicon steel sheet having a thickness of 0.25 to 1.0 mm has been used. The steel sheet has strength and is easy to handle. That is, the magnetic core of the silicon steel sheet has a small decrease in magnetic properties and a small change in shape even when an external stress is applied due to the effect of the coating film on the surface.

[0003] As an invention in which the magnetic characteristics of a transformer are prevented from deteriorating and noise generated is reduced, Japanese Patent Application No. Hei.
No. 589 and JP-A-63-17442.

As shown in FIG. 5, a magnetic core 21 wound with a silicon steel plate, a coil 22 composed of a primary winding and a secondary winding, a coil supporting member 23 made of a press board, polyester or the like, and a case 24 The upper and lower coupling plates 26, 26, and the lower metal fittings 27 are provided. The coil 22 is connected to the upper metal fittings 25, the upper and lower connecting plates 26, and the lower metal fittings 27 via upper and lower coil supporting members 23. Assembled. The magnetic core 21 is placed on the lower metal fitting 27 and is separated from the upper metal fitting 25 by a gap.
8 and the coil 22 and the iron band 2
9 is fixed along the corners of the magnetic core 21 integrally at the center of the upper metal fitting 25 and the lower metal fitting 27.

Since the magnetic core 21 has a large space factor and a large mechanical strength, it can be handled like a rigid body with almost no deformation due to the stress such as the weight of the coil 22 and has a small magnetostriction constant. Therefore, the change in the magnetic properties with respect to the stress was small. In particular, noise that is sensitive to stress can be reduced by storing the entire lower surface of the lower metal fitting 27 in the case 24 via the cork sheet support 30. Numeral 31 in the figure indicates insulating oil such as mineral oil in the case 24. In recent years, amorphous magnetic alloy thin films have been used as transformer cores because of their low loss and good magnetic properties. The lossy amorphous magnetic core is sensitive to stress because its space factor is small and its magnetostriction constant is large.Even if a small force is applied, its shape changes or its magnetic properties tend to deteriorate, especially for noise. Is sensitive, and in the configuration in which the entire lower surface of the lower metal fitting 27 of the body is housed in the case 24 via the elastic body support 30, the noise level greatly varies. In addition, since the amorphous magnetic alloy ribbon after annealing is very brittle, crushed pieces are easily generated, and the variation in characteristics becomes large.

[0006]

As described above, a transformer having an amorphous magnetic core having a conventional structure has a problem that the magnetic characteristics are easily deteriorated, and the noise and the dispersion of the characteristics are large. .

An object of the present invention is to solve the above-mentioned problems and to provide an amorphous core transformer in which a decrease in magnetic characteristics is reduced, noise is reduced, and variations in characteristics are reduced. .

[0008]

In order to achieve this object, an amorphous magnetic core transformer according to the present invention is a magnetic core supporting member comprising an upper metal member and a lower metal member, which is disposed above and below a magnetic core and a coil. The coil is supported via the coil support material, and the entire body is integrally fixed with a band to form a body. The body is in the same direction as the coil support material, the distance between the body support members and the width of the magnetic core. It has a configuration in which a pair of container supports are provided upright on a case or a floor to be stored so that the dimensions are 0.5 or more.

[0009]

In this construction, the stress due to the weight of the coil applied to the magnetic core is reduced, the center of the lower metal fitting can be bent by supporting the outside of the magnetic core, and the stress is not concentrated locally. Become.

[0010]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a magnetic core 1 wound with an amorphous magnetic alloy ribbon, a coil 2 composed of a primary winding and a secondary winding, and a coil supporting material which is a molding material such as a press board or polyester. 3. Upper and lower metal fittings 4 and 5, which are magnetic core supporting members, upper and lower connecting plates 6, a core bobbin 7 made of aluminum, stainless steel, iron, or the like for supporting the inner shape of the magnetic core 1, and protecting the outer peripheral portion of the magnetic core 1. Material 8 made of silicon steel plate or the like, support spacer 9 made of an insulating material such as rubber, resin, or press board for supporting between magnetic core 1 and coil 2, cushioning material 1
0a, 10b, a band 11 for fixing the magnetic core 1, and the like. The cushioning members 10a and 10b are made of an elastic material such as a woven mat such as polyethylene terephthalate (PET), paper provided with voids, or silicone rubber. Then, the core bobbin 7 is mounted inside the magnetic core 1, the upper metal fitting 4 and the lower metal fitting 5 are assembled outside the magnetic core 1 through cushioning materials 10 a and 10 b, and the core bobbin 7 is The coil 2 is assembled so as to support the coil 2 by disposing the upper metal fitting 4, the lower metal fitting 5, and the coil supporting member 3 above and below the coil 2. Then, outside the point A corresponding to the extension of the inner side surface of the leg of the magnetic core 1 and the magnetic core 1
The upper and lower metal fittings 4 and 5 are fixed integrally with the band 11 so as to have a fixed contact portion between the band 11 and the inside of a point B corresponding to an extension of the outer side surface of the leg. Thereafter, in order to maintain the entire shape, the container is fixed by the upper and lower connecting plates 6 to form a container. The integrally fixed body is in the same direction as the coil supporting member 3, and the ratio (C / D) of the distance C between the pair of body supports 12a and 12b to the width D of the magnetic core 1 is 0.5. The container supports 12a and 12b are erected and supported as described above, and stored in the case 13.

The vessel supports 12a and 12b are made of a rigid material such as iron or resin or an elastic material such as rubber or cork. 4a in the figure is a mounting portion of the upper bracket 4, 14 is insulating oil,
Reference numeral 17 denotes a lower yoke portion of the magnetic core 1.

As shown in FIG. 2, vessel supports 12a,
Ratio between the mutual distance C of 2b and the width D of the magnetic core 1 (C / D)
Is larger, the noise is lower, and is stabilized when the value is 0.5 or more.

Also, as can be seen from the comparison values based on a 10 mm thick iron plate, the lower the thickness of the container supports 12a and 12b is, the lower the noise is when the iron plate and the cork sheet are combined. I do.

As shown in FIG. 3, the lower metal fitting 5 has a flat portion 5a, a bent portion 5b perpendicular to the coil supporting member 3, a bent portion 5c in the same direction as the coil supporting member 3, and a hole 5d through which the band 11 passes. And the vessel supports 12a, 12a
The positioning L bracket 16 to which b is fixed by welding or an adhesive and to which the nut 15 is welded is disposed at the position of the outer dimensions of both legs of the magnetic core 1.

In the amorphous magnetic core transformer constructed as described above, the position of the fixed contact portion between the upper metal fitting 4 and the lower metal fitting 5 and the band 11 corresponds to the extension of the inner side surface of the leg of the magnetic core 1. From the point toward point B corresponding to an extension of the outer surface of the leg of the magnetic core 1, the weight of the coil 2 applied to the magnetic core 1 and the tightening force of the band 11 at the corner of the magnetic core 1 decrease. Therefore, even when the magnetic core 1 is hung by using the mounting portion 4a of the upper metal fitting 4, the weight of the coil 2 is hardly applied to the magnetic core 1. Also, since the band 11 does not directly tighten the corners of the magnetic core 1 with the band 11 and supports the entire bottom surface of the magnetic core 1, the stress applied to the magnetic core 1 is reduced and equalized, and the deformation and deformation of the magnetic core 1 are reduced. It is possible to reduce crushing, reduce deterioration in magnetic properties, and reduce variations in properties.

Further, since the weight of the coil 2 is hardly applied to the magnetic core 1, the stress applied to the magnetic core 1 can be reduced and equalized, and the outer portions of the magnetic core 1 are supported by the body supports 12a and 12b. Since the central portion of the metal fitting 5 can be bent, stress is not locally concentrated on the lower yoke portion 17 or the corner portion where the weight is the highest, so that the magnetic characteristics are reduced and the noise is reduced and the characteristics are reduced. Can be reduced. The center in the width direction of the amorphous alloy ribbon is more effective because it is often thicker than its ends.

In this embodiment, the case where the container is housed in the case 13 is shown, but the same effect can be obtained when the container is installed on the floor via the container supports 12a and 12b.

Further, in the oil-immersed transformer in which the body is housed in the case 13 containing the insulating oil 14 such as mineral oil, 4 to 15 horn noise is reduced as compared with the case where the insulating oil 14 is not put in the case 13.

(Embodiment 2) A second embodiment of the present invention will be described below with reference to the drawings.

The present embodiment is characterized in that the area of the flat portion 5a of the lower metal fitting 5 is reduced, the formation of the hole 5d through which the band 11 passes is not required, and the assembling is simplified. It was easy. That is, as shown in FIG. 4, the lower bracket 18 is a bracket in which a flat portion 18 a and a bent portion 18 b in a direction perpendicular to the coil support member 3 are formed.
It is formed by arranging two L brackets each including a vertical portion 18c and a horizontal portion 18d so as to face each other and to separate them. A bent portion 18e at the end of the L fitting is formed for fixing the coil support member 3, and the vertical portion 18e of the L fitting is formed.
A gap is provided between c and the flat portion 18a.

As described above, according to the present embodiment, the first embodiment
The area of the flat portion 5a of the lower metal fitting 5 can be reduced, and the processing of the hole 5d through which the body band 11 passes is unnecessary.
Since the a and 12b and the positioning L bracket 16 are not required, the cost can be reduced in terms of materials and man-hours.

The horizontal portion 18d of the L fitting is the container support 1
2a and 12b can be shared, and since there is a gap under the lower metal fitting 18, the body can be placed on the table and the body band 11 can be hung in the assembling work. The body band can be easily hooked.

[0024]

As is clear from the above description, the present invention provides a magnetic core supporting member composed of an upper metal fitting and a lower metal fitting, and supports a coil via a coil supporting material disposed above and below the magnetic core and the coil. Then, the entire body is integrally fixed with a band to form a body, and the body is in the same direction as the coil support material, and the ratio of the distance between the body supports to the width dimension of the magnetic core is 0.5 or more. An excellent amorphous material that reduces magnetic characteristics, reduces noise, and reduces variations in characteristics, with a configuration that provides a pair of container supports that stand upright on the case or floor where it is installed. A magnetic core transformer can be realized.

[Brief description of the drawings]

FIG. 1A is a front half sectional view showing the inside of a case of an amorphous magnetic core transformer according to a first embodiment of the present invention. FIG. 1B is a view showing the inside of the case of the amorphous magnetic core transformer. Side half sectional view

FIG. 2 shows a comparison value of noise with respect to a ratio between a distance between a pair of body supports of the amorphous magnetic core transformer and a width dimension of the magnetic core.
Graph showing the material and thickness of vessel support

FIG. 3A is a plan view of a lower bracket of the amorphous magnetic core transformer, and FIG. 3B is a front view of the same.

FIG. 4A is a plan view of a lower metal fitting of an amorphous magnetic core transformer according to a second embodiment of the present invention, and FIG.

FIG. 5 is a front half mounting cross-sectional view showing the inside of a case of a conventional magnetic core transformer wound with a silicon steel sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic core 2 Coil 3 Coil support material 4 Upper metal fitting (magnetic core support material) 5 Lower metal fitting (magnetic core support material) 12a, 12b Body support 13 Case C Distance between body supports D Width dimension

Claims (2)

(57) [Claims] 1. A magnetic core wound with an amorphous magnetic alloy ribbon, a coil disposed on the magnetic core, coil support members provided above and below the coil, and a case for accommodating the magnetic core. A magnetic core supporting member for fixing; and a pair of body supports standing upright on the case or the floor on which the case is installed. The coil supporting member is provided above and below the coil to support the coil and The fixing of the magnetic core by the core supporting member is performed by integrating the magnetic core supporting member with a fixed contact portion by a band on the inner side surface of the leg portion of the magnetic core outside the extension line, and An amorphous core transformer in which the ratio of the distance between the pair of body supports and the width dimension of the core is 0.5 or more in the same direction as the coil support member. . 2. A lower metal fitting comprising two L metal fittings, wherein a flat metal fitting bent at the size of the outer surface of both legs of the magnetic core is provided with its bent portion arranged in the width direction of the magnetic core. 2. The amorphous magnetic core transformer according to claim 1, wherein a gap is provided between the metal fitting and the vertical portion so that the coil supporting member can be arranged.