KR20160081493A

KR20160081493A - A core for transformer

Info

Publication number: KR20160081493A
Application number: KR1020140195419A
Authority: KR
Inventors: 박종민; 하정우; 윤희성; 김중경
Original assignee: 주식회사 효성
Priority date: 2014-12-31
Filing date: 2014-12-31
Publication date: 2016-07-08

Abstract

The present invention relates to an iron core of a transformer, which is arranged horizontally with an upper yoke and an upper yoke, which are composed of a plurality of electrical steel plates laminated so that their longitudinal side faces are located on the same plane, A lower yoke formed of a plurality of electric steel plates laminated so as to be positioned on a plane, and a plurality of legs wound around the coil and vertically disposed between the upper yoke and the lower yoke, So that the coil wound on the legs is effectively supported and the manufacturing cost is reduced by reducing the overall weight and iron loss.

Description

{A CORE FOR TRANSFORMER}

The present invention relates to an iron core of a transformer, and more particularly, to an iron core of a transformer that reduces iron amount and iron loss through a change in the lamination structure of the electric steel sheet.

The transformer is a transformer that changes the magnitude of AC voltage and current by using electromagnetic induction phenomenon. The transformer generally comprises an upper yoke, a lower yoke, a plurality of legs, a coil wound on the legs, and a current generator providing a high frequency current to the coil.

In this case, the core of the transformer, that is, the iron core is constituted by coupling the upper yoke, the lower yoke, and the plurality of legs. The upper yoke, the lower yoke, and the plurality of legs are each formed of a laminate in which an electrical steel sheet is laminated.

Japanese Patent Laid-Open Publication No. 2005-056942 (Patent Document 1) and Korean Patent Laid-Open Publication No. 2013-0076930 (Patent Document 2), which is an election result of the present applicant, have been disclosed as prior art related to the core of a transformer.

Patent Documents 1 and 2 propose an iron core structure of a transformer in which structural rigidity of the iron core is increased to generate vibration and noise. However, Patent Literature 1 and Patent Literature 2 have a limitation on the premise of the iron core structure of the conventional transformer described below.

1 is a perspective view showing an iron core of a conventional transformer.

Referring to FIG. 1, a conventional iron core of a transformer includes an upper yoke 10, a lower yoke 20, and legs 30.

The upper yoke 10 forms an upper portion of an iron core of the transformer, and a plurality of electric steel plates are laminated. The upper yoke 10 is formed with a plurality of grooves formed in each of the plurality of electrical steel plates to form a leg engagement portion 11.

The lower yoke 20 forms a lower portion of the iron core of the transformer, is horizontally disposed on the upper yoke 10, and is formed by stacking a plurality of electric steel plates. The lower yoke 20 is formed with a leg engagement portion 21 at a position facing the leg engagement portion.

The legs 30 are formed by stacking a plurality of electrical steel plates and are vertically coupled to the upper yoke 10 and the lower yoke 20 to support both of them, and the coils are wound on one side. The legs 30 can be divided into an outer leg 31 coupled with the ends of the upper yoke 10 and the lower yoke 20 and an inner leg 32 coupled with the torso, May vary.

Specifically, the leg 30 has a yoke engaging portion 30a provided at one side thereof coupled to the leg engaging portions 11 and 21 and assembled with the upper yoke 10 and the lower yoke 20. [ The yoke engaging portion 30a may be formed of the yoke engaging portion 31a of the outer leg 31 and the yoke engaging portion 32a of the inner leg 32. [

In this case, since the iron core of the conventional transformer is circular in cross section (hereinafter referred to as lamination cross section) except for the leg coupling portions 11 and 21 of the upper yoke 10 and the lower yoke 20, There is a problem that the coil can not be effectively supported because the contact area with the coil is small.

In addition, the weight of the iron core is unnecessarily increased because the legs 30 are manufactured according to the circular lamination cross section of the upper yoke 10 and the lower yoke 20.

In addition, there has been a problem that the increase in the weight of the iron core accompanies the increase in the iron loss at the same time.

Further, the increase in the weight and iron loss of the iron core raises the manufacturing cost.

Japanese Patent Application Laid-Open No. 2005-056942 Korean Patent Laid-Open Publication No. 2013-0076930

SUMMARY OF THE INVENTION In order to solve the above-described problems, it is an object of the present invention to provide an iron core for a transformer in which electrical steel plates are laminated so that the lamination cross section of the upper yoke and the lower yoke is laminated so as to effectively support coils wound on the legs.

In addition, the present invention provides an iron core for a transformer in which the legs are manufactured in accordance with the semi-elliptical laminated section of the upper yoke and the lower yoke, thereby reducing the overall weight.

In addition, the present invention provides an iron core for a transformer that reduces iron loss through overall weight reduction.

It is another object of the present invention to provide an iron core for a transformer that reduces the manufacturing cost by reducing the weight and iron loss of the iron core.

Further, it is an object of the present invention to provide an iron core for a transformer in which a predetermined escaping groove is formed at one side to provide insulation, lead out of a coil, or ease of manufacture of a wrought iron.

The iron core of the transformer according to the embodiment of the present invention is horizontally arranged with an upper yoke and an upper yoke which are made of a plurality of electric steel plates laminated such that their longitudinal side faces are located on the same plane, A lower yoke comprising a plurality of electrical steel sheets laminated so as to be positioned on the same plane, and a plurality of legs, each coil being wound and coupled to both ends of the upper yoke and the lower yoke, .

In this case, the electrical steel sheets of the upper yoke may have a semi-elliptical cross-section of the lamination.

At this time, it is preferable that the electrical steel plates of the upper yoke have individual widths in which the lamination section becomes circular when each of the steel plates is rearranged so that their center lines are aligned.

On the other hand, the electric steel sheets of the lower yoke may have a semi-elliptical shape in cross section.

At this time, it is preferable that the electrical steel plates of the lower yoke have individual widths in which the lamination section becomes circular when the center lines of the steel plates are rearranged so as to coincide with each other.

The upper yoke may be further stacked with at least one auxiliary electrical steel sheet, which is located in a position different from the plane in which the longitudinal side faces of the electrical steel plates of the upper yoke are located, to form a predetermined escape groove.

The lower yoke may be further laminated with at least one auxiliary electrical steel sheet which is located in a position shifted from the plane in which the longitudinal side faces of the electrical steel plates of the lower yoke are positioned to form a predetermined escape groove.

As described above, the transformer iron core according to the present invention can effectively support the coils wound on the legs by stacking the electrical steel plates so that the cross section of the upper yoke and the lower yoke becomes semi-elliptical.

In addition, the iron core for a transformer according to the present invention is manufactured in accordance with the half-elliptical laminated section of the upper yoke and the lower yoke, and the overall weight is reduced.

In addition, the iron core for a transformer according to the present invention reduces iron loss through overall weight reduction.

Further, the iron core for a transformer according to the present invention reduces the manufacturing cost by reducing the weight and iron loss of the iron core.

Furthermore, the iron core for a transformer according to the present invention has a predetermined escape groove formed on one side thereof to facilitate the insulation, the lead portion of the coil, or the manufacture of the wrought iron.

1 is a perspective view showing an iron core of a conventional transformer.
FIG. 2 is a perspective view showing one of the electric steel plates constituting the upper yoke and the lower yoke of the iron core of the transformer according to the embodiment of the present invention.
3 is a perspective view illustrating an iron core of a transformer according to an embodiment of the present invention.
4 is a partial perspective view showing a state where the coil is wound on the transformer shown in Fig.
FIG. 5 is a graphical representation of the arrangement of electrical steel plates in an iron core of the transformer shown in FIG. 2; FIG.
6 is a partial perspective view of an iron core of a transformer according to another embodiment of the present invention.

The accompanying drawings in the present invention may be exaggerated for clarity, clarity, and descriptive convenience. In addition, since the following terms are defined in consideration of the functions of the present invention, they may vary depending on the intention or custom of the user, the operator, and the definitions of these terms should be based on the technical contents throughout this specification will be. On the contrary, the embodiments are merely illustrative of the constituent elements set forth in the claims of the present invention and do not limit the scope of the present invention, and the scope of the rights should be interpreted on the basis of technical ideas throughout the specification of the present invention .

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an iron core of a transformer, and more particularly, 4 is a partial perspective view showing a state where the coil is wound on the transformer shown in FIG. 2, and FIG. 5 is a diagram virtually changing the arrangement of electrical steel sheets in the iron core of the transformer shown in FIG.

2 to 5, an iron core of a transformer according to an embodiment of the present invention includes an upper yoke 100, a lower yoke 200, and legs 300.

First, referring to FIG. 2, an electric steel plate constituting the upper yoke 100 and the lower yoke 200 to be described later is defined. Generally, the electric steel sheet is made of a material containing silicon.

The height H and the width W of the individual electric steel sheets 1 (the auxiliary electric steel sheets 2 and the electric steel sheets 1 described later) And a leg plate steel plate engaging portion 1b to which an electrical steel plate constituting a leg 300 described later is coupled is formed on one side thereof.

In this case, when the electric steel plate 1 is coupled with the electric steel plate of the leg 300 among the side in the length L direction of the electric steel plate 1, Side.

On the other hand, the shape of the electric steel plate 1 may be variously formed because the number and shape of the leg plate joining portions 1b are changed according to the design and manufacturing method of the transformer.

The upper yoke 100 forms an upper portion of an iron core of the transformer, and a plurality of electric steel plates are laminated.

In this case, as shown in Fig. 3, it is preferable that the plurality of electrical steel sheets are laminated so that their one longitudinal side faces are coplanar.

As a result, the contact area with the coil wound on the leg 300 is flattened to be wider than the conventional one, so that the coil is more effectively supported. The detailed description will be given later in the description of the lower yoke 200.

The upper yoke 100 has a lamination section (hereinafter referred to as a lamination section) except for the leg engagement section 110 formed by joining the leg plate section 1b of the individual steel plate 1 to one side of the upper yoke 100. [ Is preferably semi-elliptical. As a result, as in the case where the upper yoke of the conventional transformer has a circular lamination section, the outer side of the upper yoke 100 is formed by the curved surface of the semi-elliptic column, so that the existing tank (not shown) Which is a member of a transformer installed separately from the outside).

The electric steel plates of the upper yoke 100 are arranged in such a manner that the center lines of the steel plates of the upper yoke 100 are rearranged so that the center lines thereof coincide with each other It is preferable to have individual widths such that the cross section of the lamination becomes circular as in the conventional iron core of the transformer. The difference from the conventional iron core of the transformer will be described later in the description of the lower yoke 200.

The lower yoke 200 is disposed horizontally with the upper yoke 100 to form a lower portion of the iron core of the transformer, and a plurality of electric steel plates are laminated.

The lower yoke 200 of the iron core according to the embodiment of the present invention is formed such that the upper yoke 100 and the lower yoke 200 have a symmetrical shape so that the same technical structure as that of the upper yoke 100 is symmetrically arranged However, since the overall length or the shape of the end portion of the iron core of the transformer may be varied depending on the design of the iron core of the transformer, the technical features will be described from the standpoint of the independent construction.

It is preferable that the plurality of electric steel plates constituting the lower yoke 200 are stacked such that their longitudinal sides are coplanar.

As a result, the iron core of the transformer according to the embodiment of the present invention is flattened in contact area with the coil wound on the leg 300, so that the coil is more effectively supported.

4, when the winding unit 400 having the coil 300 wound around the leg 300 is installed, the length of each of the plurality of electric steel plates constituting the bottom surface of the winding unit 400 and the lower yoke 200 The lower yoke can be effectively supported in a wider area than in the case where the lower yoke has a circular lamination section. The upper yoke 100 also has the same technical effect.

The lower yoke 200 includes a lower yoke 200 and a lower yoke 200. The lower yoke 200 has a lamination section (hereinafter referred to as a lamination section) except for the leg coupling section 210 formed by joining the leg plate steel coupling sections 1b of the individual steel plates 1 to one side of the lower yoke 200. [ Is preferably semi-elliptical.

As a result, as in the case where the lower yoke of the conventional transformer has a circular lamination section, the outer side of the lower yoke 200 is composed of the curved surface of the semi-elliptic column, and the existing tank (not shown) Which is a member of a transformer installed separately from the outside).

The electric steel plates of the lower yoke 200 are arranged in such a manner that the center lines of the steel plates of the lower yoke 200 are rearranged so that the center lines thereof coincide with each other It is preferable to have individual widths such that the cross section of the lamination becomes circular as in the conventional iron core of the transformer.

5, a plurality of electric steel plates constituting each of the upper yoke 100 and the lower yoke 200 are virtually rearranged so that their center lines are aligned. In this case, in order to secure the winding height CL as shown in FIG. 3 with the conventional laminated sectional structure, it is known that the electric steel sheet material for filling the insufficient portion M in the leg 300 should be low .

Therefore, the iron core of the transformer according to the embodiment of the present invention can reduce the production cost due to the overall weight of the iron core of the conventional transformer and the resulting iron loss reduction. Experimental results show that when the iron core of the present invention is compared with the conventional iron core by Naional Grid 275MV 240MVA, the iron amount is reduced from 44,483kg to 43,593kg (when the 3300 won per kg is applied, the manufacturing cost is reduced by 300,000 won) And 37.3 kW (US $ 6200 per kW, and KRW 1100 won, respectively).

The leg 300 is provided with a winding part 400 in which a coil is wound and both ends of the leg 300 are coupled to the upper yoke 100 and the lower yoke 200, Respectively. It is a matter of course that a plurality of transformers can be installed according to the intention of the transformer.

In this case, the leg 300 may be divided into an outer leg 310 coupled with an end of the upper yoke 100 and the lower yoke 200, and an inner leg 320 coupled with the body.

The yoke coupling portion 300a provided at one side of the leg 300 can be engaged with the leg coupling portions 110 and 210 of the upper yoke 100 and the lower yoke 200. In this case, The coupling portion 300a may be formed of a yoke coupling portion 310a of the outer leg 310 and a yoke coupling portion 320a of the inner leg 320. [

Referring to FIG. 6, the iron core of the transformer according to another embodiment of the present invention may include the laminated structure of the electric steel sheet of the upper yoke 100 or the lower yoke 200, It shows a difference. Although the description is made with reference to the lower yoke 200, the upper yoke 100 may have the same technical features, and the same description as the one embodiment described above is omitted for the sake of simplicity of the present invention.

As shown in FIG. 6, the lower yoke 200 has at least one or more of the longitudinal yokes 200, which are located on the longitudinal side of the lower yoke 200, The auxiliary electrical steel sheet 2 may be further laminated.

That is, the auxiliary electrical steel sheet 2 is laminated to the outside of the electrical steel sheets at a lower height, for example, as shown in FIG. 6 to form the escape grooves 220. This escape groove 220 is used as a space for insulation, lead-out of the coil, or forging of the wrought iron in the construction of the transformer using the present invention.

In order to explain the features of the present invention separately, the electric steel plate of the lower yoke 200 and the auxiliary electric steel plate 2 have been separately described, but in the embodiment according to FIGS. 2 to 5, only the outermost predetermined layer Just put it down and its technical idea will be the same.

As described above, the transformer iron core according to the present invention effectively supports the coils wound on the legs, reduces the manufacturing cost by reducing the overall weight and the iron loss, further enhances insulation, leads the coils, .

As described above, the present invention has been described with reference to the embodiments shown in the drawings. However, it should be understood that the present invention is by way of example only and that various modifications and equivalent embodiments are possible on the basis of common knowledge in the art . Therefore, the true technical protection scope of the present invention should be determined based on the specific contents of the above-mentioned invention in accordance with the claims to be described below.

The present invention relates to an iron core of a transformer and is applicable to an industrial field related to a transformer.

1: electric steel plate 1a: longitudinal side surface
1b:
100: upper yoke 110: leg coupling portion
200: lower yoke 210: leg coupling portion
220: escape home
300: legs 310: outer legs
320: inner legs 300a, 310a, 320a:
400:

Claims

An upper yoke consisting of a plurality of electrical steel plates stacked such that their longitudinal side faces are coplanar;
A lower yoke consisting of a plurality of electrical steel plates arranged horizontally to the upper yoke and stacked such that their longitudinal side faces are coplanar; And
A plurality of legs wound around the coils and coupled at both ends to the upper yoke and the lower yoke so as to be vertically disposed between the upper yoke and the lower yoke;
And an iron core of the transformer.

The electric motor of claim 1,
And the laminated section is semi-elliptical.

The electric motor according to claim 2,
And each of the steel plates has an individual width in which the lamination section becomes circular when the center lines of the steel plates are rearranged to coincide with each other.

The electric machine as claimed in claim 1,
And the laminated section is semi-elliptical.

The electric machine according to claim 4,
And each of the steel plates has an individual width in which the lamination section becomes circular when the center lines of the steel plates are rearranged to coincide with each other.

The motorcycle according to claim 1,
Wherein at least one auxiliary electrical steel sheet is formed by further laminating at least one auxiliary electrical steel sheet whose longitudinal side face is located at a position shifted from a plane where longitudinal side faces of the electrical steel plates of the upper yoke are located to form predetermined escape grooves.

The semiconductor device according to claim 1,
Wherein at least one auxiliary electrical steel sheet is further laminated, the longitudinal side surface of which is located in a position shifted from a plane where the longitudinal side faces of the electrical steel plates of the lower yoke are located, thereby forming a predetermined escape groove.