JPS5943703Y2 - transformer pentapod core - Google Patents

Description

[Detailed description of the invention] The present invention relates to a five-leg iron core for a transformer, and includes the effective use of the magnetic properties of the grain-oriented silicon steel plate that constitutes the core, the improvement of phase material yield, and the miniaturization of a core cutter. The purpose is to

Therefore, the feature of the present invention is to construct a three-phase pentapod core by sequentially inverting unit laminates of the same structure by 180° and stacking them, each of which is made by butt-joining the divided pieces made of grain-oriented silicon steel plates. There is a particular thing.

Conventionally, many methods have been proposed for joining three-phase tripod cores, and many of them are practical.

However, most of these are aimed at improving magnetic properties, and few are aimed at improving material yield or making effective use of core cutters.

Therefore, in the present invention, we took this point into consideration and devised a joining method that improves yield, effectively utilizes the magnetic properties of grain-oriented silicon steel sheets, and requires only a small core cutter.

In addition, small to medium capacity induction electric appliance cores generally require a small core width, but large capacity appliances have a large core cross-sectional area, resulting in a wider core width and the need for large equipment for cutting and annealing the core. In addition, the weight of the unit core was also large, making assembly difficult, but this point has also been improved by the present invention.

Hereinafter, a conventional iron core and an iron core of the present invention will be sequentially explained with reference to the drawings.

1 to 4 show the configuration of a conventional three-phase five-leg iron core and its cut state.

1 and 2 are plan views showing the structure of each unit layer, and FIG. 2 shows a structure similar to that of FIG. 1, but reversed by 180°.

Further, FIG. 3 is a plan view showing a state in which the unit layer having the structure shown in FIG. 1 and the unit layer having the structure shown in FIG. 2 are superimposed.

There are two cases in which the core is constructed by alternately piling up one layer each of the unit layer shown in Fig. 1 and one layer each of the structural unit layer shown in Fig. 2, and a case in which a set of each unit layer (for example, two layers or three layers each) is formed. They may be stacked alternately.

In the figure, 1 is the central leg piece, which has a roof shape with an apex angle of 90 mm at both ends, and its apex is located at a distance of 10,000 mm of the width of the central leg from the inner edge of the yoke, and is located inside the yoke. They are located on a straight line parallel to the edge and shifted in opposite directions by an amount of deviation a from the center line of the central leg.

Reference numeral 2 denotes an outer leg piece, which is butt-connected to the outer vertical iron piece through a diagonal connecting line 45.

Further, 3 is a central yoke piece, and both ends thereof have a Y-shaped joining line with the central leg piece 1.

4 and 5 are outer vertical iron pieces, one end of which is butt-connected to the outer leg piece 2 at the joint line of 45, the other end is butt-connected to the central leg piece 1 at the joint line of 45, and the remaining part is connected to the outer edge. It is butt-connected to the central yoke piece 3 at a joint line 90.

Reference numeral 6 designates a right-angled isosceles triangular portion where one end of the outer leg piece 2 protrudes in the width direction of the yoke due to the lap allowance of the unit layer, and is a portion to be cut off if the protrusion causes a problem.

7 is a right-angled isosceles triangular part where the tip of one side of the outer leg of the outer vertical iron piece 4 protrudes outward due to the lap allowance of the unit layer, and if it protrudes and causes a problem, it is cut off. It is.

As shown in Fig. 3, the central leg piece 1 is separated from the central yoke piece 3 or the outer vertical iron piece 5 by 2a in the longitudinal direction of the central leg, and the outer leg piece 2 is separated from the outer vertical iron piece 4 by the outer leg. The joint line between the central leg piece 1, the central yoke piece 3, and the outer vertical iron pieces 4 and 5 is wrapped in a 2a lengthwise direction, and the joining line between the central leg piece 1, the central yoke piece 3, and the outer vertical iron pieces 4 and 5 forms a figure 7 shape, and a They are slightly offset and overlap alternately.

FIG. 4A is a cutout diagram of the center leg piece 1, and the 80th part is an unnecessary part, which deteriorates the material yield.

FIG. 4B is a cutout drawing of the outer leg piece 2, and 60 parts are cut off if necessary.

FIG. 4C is a plan view of the central yoke piece 3, and the 90th part is an unnecessary part, which deteriorates the material yield.

The fourth drawing is a cutout drawing of the outer vertical iron pieces 4 and 5, and is 90
The portion is an unnecessary portion, which also reduces the material yield.

These unnecessary portions 8 and 9 accounted for several percent of the total weight of the core.

If necessary, the above 70 portions are cut.

Good magnetic properties were obtained at the joints between the central leg piece 1 and the central yoke piece 3 or the outer vertical iron pieces 4 and 5, and at the joints between the outer leg piece 2 and the outer vertical iron pieces 4 and 5, but the material The disadvantage was that the yield was poor.

In addition, the transformer capacity is large and the iron core width is silicon steel plate (strip).
When the width exceeds the standard width, the structure and cutting method shown in FIGS. 5 to 8 have been adopted.

As shown in FIG. 5, the central leg piece is divided into central leg pieces 11 and 12 at a position offset by b in parallel to the center line to form a unit layer.

The other parts have the same structure as in FIG.

Fig. 6 shows the same structure as Fig. 5 but with the left and right sides turned over, and Fig. 7 is a plan view showing a state in which the unit layer of Fig. 5 and the unit layer of Fig. 6 are superimposed. It is.

There are two cases in which the iron core is constructed by alternately piling up the unit layers of the structure shown in Figure 5 and the unit layers of the structure shown in Figure 6, and two cases in which each layer is stacked alternately (for example, two or three layers each) as a set. They may be stacked alternately.

As shown in FIG. 7, in the central leg, joining lines are alternately arranged for each unit layer at positions b apart from each other on both sides of the center line.

FIG. 8A is a cut-out diagram of the central leg piece 11, and 13 and 14 are unnecessary parts that impair the material yield.

FIG. 8B is a cutout diagram of the center leg piece 12, and the cutout of other parts is the same as in FIGS. 4C and D.

Although the material yield is better in the blanking method of FIG. 8A than in the case of FIG. 4A, the material yield is still poor because of the unnecessary parts 9, 13, and 14.

The present invention is designed to maximize the magnetic properties of grain-oriented silicon steel sheets in three sets of five-leg iron cores, improve material yield, and utilize materials effectively without waste.
The following will explain the embodiments shown in FIGS. 9 to 12.

9 and 10 are plan views showing the structure of each unit layer, and FIG. 10 is a structure obtained by turning FIG. 9 upside down.

FIG. 11 is a plan view showing a state in which the unit layer having the structure shown in FIG. 9 and the unit layer having the structure shown in FIG. 10 are superimposed.

One unit layer with the configuration shown in Figure 9 and one unit layer with the configuration shown in Figure 10.
There are cases where the iron core is constructed by stacking layers alternately, and cases where a plurality of layers (for example, two layers or three layers each) are stacked alternately as a set.

In the figure, 21 and 22 are central leg pieces that are joined at a position offset by a distance from the center line of the central leg to form a central leg, and the tip thereof extends from the intersection with the outermost side of the upper and lower yokes. It is joined to the yoke piece 25 or 26 and 2T at the following angle θ with respect to the joining line.

That is, if the width of the center leg is A1 and the width of the yoke is B, then θ=tan --- and the width of the center leg piece 21 is 72B.
A + B, the width of the central leg piece 22 is Σ-a.

23 is an outer leg piece that is butt-connected to the outer vertical iron piece 26 at a 45° joining line, and 24 is an outer leg piece that is connected to the outer vertical iron piece 2 at a joining line of 45.
The outer leg piece 24 is butt-connected to the T and has a wrap width 2a.
It is twice as long as the outer leg piece 23 and shorter than the outer leg piece 23.

Further, both ends 6 of the outer leg piece 240 are parts that protrude to the outside of the outer yoke piece due to the wrap relationship, and are parts that can be cut off if necessary.

One end of the outer vertical iron piece 26 is butt-connected to the outer leg piece 23 at the 45°b joining line, and the tip 7 is a part that protrudes toward the outer leg needle side due to the wrap relationship, and is a part that can be cut off if necessary. The ends are butt-connected to the central leg piece 22 at the joining line at the angle θ.

One end of the outer vertical iron piece 27 is butt-connected to the outer leg piece 24 at a joining line of 45 degrees, and the other end is butt-connected to the center leg piece 21 at a joining line of the angle θ.

As can be seen from Fig. 11, the joining lines of the central leg pieces alternately appear offset by a distance from the center line of the central leg, and the overlap distance is 2a.
It is.

The center leg pieces 21 and 22 are stacked with the center yoke piece 25 or the outer vertical iron piece 27 with an overlap margin of 2a in the length direction of the yoke,
The outer leg piece 23 is stacked on the outer vertical iron piece 26 with an overlap margin of 2a in the length direction of the yoke.

FIG. 12A is a cutout view of the center leg piece 21, FIG. 12B is a cutout view of the center leg piece 22, and FIG. 12C is a cutout view of the outer leg pieces 23 and 24.
The 12th plan is the 1st plan of the central yoke 25.
FIG. 2E is a plan view of the outer vertical iron pieces 26 and 27.

Since the five-leg iron core of the transformer according to the present invention has the above configuration, it has the following effects.

1. As shown in Figures 12A-E, with regard to silicon steel strip as a material, there is no need to cut off unnecessary parts as in the past, and all the material is used effectively ( Material yield is 100%).

2. In the lamination of the central leg pieces, the bonding lines have an overlap of 2a, which reduces the drop in interlayer insulation resistance when laminated, and reduces the eddy current product.

3. Since the joining angle between the central leg piece and the yoke piece is almost perpendicular to the direction of magnetic flux, the magnetic properties of the iron core are improved.

Since the center leg is constructed with width-divided center leg pieces, it is possible to use a core cutting machine for small to medium sizes even for the core of a large-capacity transformer, and equipment and personnel can be used effectively.

[Brief explanation of drawings]

Figures 1 to 4 show the configuration and cut state of the conventional three-legged core, Figures 1 and 2 are plan views showing the configuration of each unit layer, and Figure 3 shows the configuration of the conventional three-legged core. FIG. 4A is a plan view of the illustrated structural unit layers stacked one on top of the other, FIG. C is a plan view of the center yoke with planing; the fourth drawing is a plan view of the outer vertical iron with planing; FIGS. 5 to 8 show cases where the core width exceeds the standard width; The figure is a plan view of the central leg piece, Figure 6 is a plan view of the same configuration as in Figure 5 with the left and right sides turned over, and Figure 7 is a superimposition of the unit layers in Figures 5 and 6. A plan view of the state, FIG. 8A shows the central leg piece 11.
FIG. 8B is a plan view of the center leg piece 12 in a planar state, FIGS. 9 to 12 show embodiments of the present invention, and FIGS. FIG. 10 is a plan view showing the structure of a unit layer, and FIG. 10 shows the structure of FIG. 9 turned right and left over.
11 is a plan view of a state in which the unit layers having the configurations shown in FIGS. 9 and 10 are superimposed, FIG. 12A is a plan view of the center leg piece 21 in a boarded state, and FIG. 12B is a plan view of the center leg piece 21. 12C is a plan view of the outer leg pieces 23 and 24 in the planed state, Figure 12 is a plan view of the central yoke 25 in the planed state, and FIG. FIG. 3 is a plan view of the vertical iron pieces 26 and 27 in a cut-out state. 21, 22... Central leg piece, 23, 24...
...Outer leg piece, 25...Central yoke piece, 26,2
7...Outer vertical iron piece.

Claims (1)

[Scope of utility model registration request] The outer leg pieces, center yoke pieces, and outer vertical yoke pieces are made of thin steel plates.
and a central leg piece, and the inclined cut ends of these pieces are butt-joined to each other to form a unit layer, and in a transformer core formed by laminating these unit layers, the central leg piece is It is formed by butting and arranging two types of thin steel plates with different width dimensions, and each of the two thin steel plates is provided with an inclined portion at the end of the central leg so that the apex is on the line of the abutting portion of both thin steel plates. and the unit layer is formed by butt-joining the inclined cut ends of the yoke pieces to both inclined parts of one end of the center leg, and the unit layers are sequentially reversed by 180 degrees and stacked. The left leg core of the transformer.