JPH0447966B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a core for a core type three-phase five-legged transformer, and particularly to a transformer core that reduces core loss and improves workability.

[Conventional technology]

A conventional device will be explained with reference to FIGS. 4 to 6 with respect to Japanese Utility Model Application Publication No. 55-65825.

5 and 6 are plan views showing the structure of each unit layer, and FIG. 6 is a structure in which the left and right sides of FIG. 5 are reversed. FIG. 4 is a plan view showing a state in which the unit layer having the configuration shown in FIG. 5 and the unit layer having the configuration shown in FIG. 6 are superimposed. The iron core is stacked in the state shown in the plan view shown in FIG. 4. Central leg piece 2
1, 22, lower yokes 25, 26, 27, and upper yokes 25', 26', 27' have a structure in which the four vertices of each are coincident. Since the central leg piece, outer leg piece, and lower yoke piece allow the core to stand upright in the stacked state, dismantling the core and inserting the iron are not necessary. on the other hand,
After the upper yoke pieces 25', 26', and 27' are erected,
After disassembling and inserting the winding into the core, insert the center leg piece 2 again.
1, 22, the outer leg pieces 23, 24 and the iron inserting combination work is performed.

[Problem to be solved by the invention]

In the above-mentioned prior art, a large amount of work time was required to match the four vertices of the combination. Further, when the magnetic flux transfers to the upper yoke pieces 25' to 25', it passes through the center leg pieces 21 and 22, so that the magnetic flux is concentrated in that part, causing an increase in iron loss.

In addition, in the above-mentioned conventional technology, the center leg piece 2
1, 22, outer leg pieces 23, 24, central yoke piece 25,
Since six types of outer sheath iron pieces 26 are required, the number of man-hours required for cutting them increases. Furthermore, in the case of stacked iron, storage space for these six types of pieces is also required, resulting in the problem that the number of man-hours and work space becomes large.

The present invention has been made based on the above-mentioned matters, and an object of the present invention is to provide a transformer core that can reduce iron loss and reduce work man-hours and work space.

[Means to solve the problem]

In order to achieve the above object, the present invention has provided that in each stacked unit layer, both outer leg pieces and upper and lower yoke pieces are joined by butting their oblique sides, and the central leg piece is moved from its center line to one side. In an inner iron type three-phase five-legged core that is divided at offset positions and joined by butting the upper and lower yoke pieces and each of the hypotenuse parts, the core pieces are one type of trapezoidal outer leg piece and , two types of trapezoidal yoke pieces for both upper and lower parts, and 1
a trapezoid-shaped first central leg piece that is divided at a position offset to one side from its center line; and a trapezoidal first central leg piece that is wider than the first central leg piece. one end of the second center leg piece has an oblique side that abuts the oblique side of the lower yoke piece, and the other end has an oblique side that abuts one of the upper yoke pieces and the other upper yoke piece. It has a touching hypotenuse.

[Effect]

Since the transformer core of the present invention can be composed of five types of pieces, the number of times of cutting is reduced, and the number of work steps can be reduced. Furthermore, since it is sufficient to prepare five types of iron pieces as described above, the storage space for these iron pieces can be reduced during iron stacking work. Furthermore, since the vertices of each iron piece overlap less, magnetic flux transfer between the upper yokes is smooth, and reduction in iron loss can be prevented.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

In Figures 1 and 2, the transformer core is
Two types of central leg pieces 11 and 12, one type of outer leg piece 1
3. Two types of upper and lower yoke pieces 15,1
It is composed of five types of pieces: 5', 16, and 16'. In this embodiment, for convenience of explanation, the yoke piece 1
7 and 17' are marked, but the yoke pieces 16 and 1
It is the same as 6'. Both outer leg pieces 13, upper and lower yoke pieces 15, 16, 17, 15', 16',
17' is formed in a trapezoidal shape and arranged with their hypotenuses facing each other. Central leg pieces 11, 12
is divided at a position shifted by dimension a to the left of the center line. The central leg piece 11 is formed by cutting one end of the upper side of a trapezoidal shape at a position of dimension 2a in the width direction, and the central leg piece 12 is trapezoidal in shape and is butted against the base of the central leg piece 11, and the apexes of the lower side are aligned. , and the upper side is arranged so that one end of the oblique side is on a straight line.

That is, both ends of the central leg piece 12 are connected to the upper or lower yoke pieces 15, 15', 16, 16', 17, 17'.
It has a hypotenuse that abuts the hypotenuse of . Further, one end of the center leg piece 11 has a hypotenuse that abuts the oblique sides of the yoke pieces 15 and 17, and the other end has an oblique side that abuts the oblique sides of one of the yoke pieces 15' and 17', and the other end has an oblique side that abuts the oblique side of one of the yoke pieces 15' and 17'. It has a hypotenuse that abuts the hypotenuses of 15' and 16'.

Therefore, the joint ends of the central leg pieces 11, 12 are aligned on the lower side with the outside of the lower yokes 15, 16, 17,
The upper side is located inside by the dimension b from the outside of the upper yokes 15', 16', and 17'. FIG. 3 is constructed by changing the left and right sides of FIG. 2.

With this structure, the outer side of the upper yoke portion consists of a combination of the upper yoke pieces 15', 16', 17' and the center leg piece 11, and it is only necessary to match the three apexes of each piece. As a result, the iron insertion work after raising the iron core and inserting the winding becomes easy. Because there are fewer joints, the magnetic flux transfers smoothly, and magnetic flux concentration is less likely to occur, reducing iron loss compared to conventional products.

On the other hand, both outer leg pieces 13 can be made of the same iron plate,
Since there are fewer types of iron pieces than in the past, there is less cutting and iron stacking work, and the storage space for iron pieces can also be reduced.

〔Effect of the invention〕

According to the present invention, in a structure in which the center leg is divided into two parts using an inner iron type three-phase five-leg iron core, it is possible to easily insert the upper yoke, the overlap of the vertices is less than before, and the distance between the upper yoke is reduced. The magnetic flux transition becomes smoother, iron loss can be reduced, and performance can be improved. In addition, since only five types of iron pieces can be used, the number of man-hours required for manufacturing iron pieces is reduced, and not only can an inexpensive transformer core be provided, but also the storage space for iron pieces can be reduced, and work efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a plan view of a combination of steel plate unit layers according to an embodiment of the present invention, FIGS. 2 and 3 are plan views of unit layers constituting FIG. 1, and FIG. 4 is a plan view of a conventional steel plate unit layer. FIGS. 5 and 6 are plan views of unit layers constituting FIG. 4. 11, 12, 21, 22... central leg piece, 13,
23, 24... Outer leg piece, 15, 16, 17, 2
5, 26, 27...lower yoke piece, 15', 16',
17', 25', 26', 27'... Upper yoke pieces.

Claims (1)

[Claims] 1. In each laminated unit layer, both outer leg pieces and upper and lower yoke pieces are joined by butting each hypotenuse part,
In an inner iron type three-phase five-legged iron core in which the central leg piece is divided at a position offset to one side from its center line, and the upper and lower yoke pieces and each of the oblique sides are butted and joined, as the core piece, It is equipped with one type of trapezoidal outer leg piece, two types of trapezoidal yoke pieces for both upper and lower parts, and one type of central leg piece, and the central leg piece is offset to one side from its center line. It has a trapezoidal first central leg piece that is divided at different positions, and a second central leg piece that is wider than the first central leg piece, and has a lower part at one end of the second central leg piece. A transformer core comprising a hypotenuse that abuts the oblique side of a yoke piece, and an oblique side that abuts one upper yoke piece and the other upper yoke piece at the other end.