JP2020113705A - Amorphous core transformer - Google Patents

Abstract

To provide an amorphous core transformer that avoids the influence on an amorphous core from the vibration of a winding.SOLUTION: An amorphous core transformer includes a winding and an amorphous core arranged in a hollow portion of the winding. The amorphous iron core is a frame-shaped iron core formed by arranging a rectangular wound iron core in which amorphous magnetic ribbons are laminated, and includes first and second core portions, a first yoke portion connected to the first and second core portions, a second yoke portion connected to the first and second core portions, a first support portion that supports the amorphous magnetic ribbon of the first yoke portion, an amorphous iron core protective case that protects the first and second core portions and also supports the first support portion, a second support portion that vertically supports the amorphous core protection case, and a third support portion that supports the winding.SELECTED DRAWING: Figure 1

Description

The present invention relates to an amorphous iron core transformer.

In recent years, as an iron core for energy-saving type transformers, an amorphous magnetic material with less magnetic loss and excellent magnetic characteristics has been used. The amorphous magnetic ribbon used for the transformer core is produced by ultra-quenching a melt of a magnetic alloy, has a very small magnetic loss, and has excellent magnetic characteristics. However, the amorphous magnetic ribbon that forms the iron core is thin, hard, and brittle.Thus, although it is formed by stacking thousands of ribbons with a thickness of about 0.025 mm, it has mechanical strength and rigidity. Is not sufficiently obtained, and it is difficult to make it stand alone like a silicon steel plate.

It is also known that amorphous magnetic materials have high stress sensitivity, and that applying magnetic stress to amorphous magnetic materials increases magnetic loss.

As a background art, Patent Document 1 is known. Patent Document 1 discloses that "a laminated amorphous magnetic ribbon is wound, both ends are wrapped to form a lap portion, and the lap portion is formed into a rectangular tube shape, and the lap portion and the lap portion are opposed to each other. An amorphous winding core having one side as a yoke part and the other two opposite sides as a quadrangular prism-shaped core part, and a chevron-shaped barrel part and the barrel part that respectively cover the four corners of the quadrangular prism-shaped core part. A core portion protection frame having hook-shaped flange portions provided at both ends of the core portion, a connecting plate connecting and fixing the flange portions to each other, and a low-voltage coil and a high-voltage coil mounted on the core portion protection frame. "Amorphous transformer characterized by" is disclosed. With such a configuration, it is described that "amorphous winding iron core is not damaged even when a coil is short-circuited and a lightweight amorphous transformer is obtained".

Japanese Patent Laid-Open No. 2015-207672

It is known that the winding of a transformer mechanically vibrates during operation. Therefore, in order to protect the hard and brittle amorphous magnetic material, it is necessary to avoid the influence of vibration of this winding.

In the technique of Patent Document 1, the winding supports the core protection frame above it, and the core protection frame supports the amorphous winding core. Therefore, the amorphous winding core is affected by mechanical vibration of the winding. There is a problem of receiving.

An object of the present invention is to provide an amorphous core transformer that avoids the influence of winding vibration on the amorphous core.

A preferred example of the present invention is an amorphous iron core transformer having a winding wire and an amorphous iron core arranged in a hollow portion of the winding wire, wherein the amorphous iron core has a rectangular winding shape in which amorphous magnetic thin bodies are laminated. A frame-shaped iron core configured by arranging iron cores, including first and second core portions, a first yoke portion connected to the first and second core portions, and the first and second core portions. A second yoke part connected to the core part of
A first support portion for supporting the amorphous magnetic thin body of the first yoke portion;
An amorphous iron core protective case that protects the first and second core portions and also supports the first supporting portion, a second support portion that vertically supports the amorphous iron core protective case, and the winding. And an amorphous core transformer having a third support portion for supporting.

According to the present invention, in an amorphous iron core transformer, it is possible to avoid the influence of winding vibration on the amorphous iron core.

1 is a front view showing an amorphous iron core transformer of Example 1. FIG. It is a cross-sectional schematic diagram explaining the iron core support structure of the amorphous iron core transformer seen from AA of FIG. 1 is a front view illustrating an iron core support structure of Example 1. FIG. It is sectional drawing explaining the iron core support structure seen from BB of FIG. It is a front view explaining the iron core support structure which eliminated the lower clamp and the abutment plate for clamps from FIG. It is a front view explaining the iron core support structure which removed the amorphous iron core protection case from FIG. It is a front view explaining the iron core support structure which eliminated the upper clamp. It is sectional drawing explaining the iron core support structure seen from CC of FIG. 5 is a front view showing an amorphous iron core transformer of Example 2. FIG. It is a cross-sectional schematic diagram explaining the iron core support structure seen from DD of FIG. It is a front view explaining the iron core support structure which eliminated the upper clamp of FIG. It is sectional drawing explaining the iron core support structure seen from EE of FIG. 5 is a front view showing an amorphous iron core transformer of Example 3. FIG. It is a cross-sectional schematic diagram explaining the iron core support structure seen from FF of FIG.

Examples will be described below with reference to the drawings.

In the present embodiment, an example of an oil-filled single-phase device will be described as an amorphous iron core transformer capable of avoiding the influence of winding vibration on the amorphous iron core.

FIG. 1 is a front view showing an amorphous iron core transformer 100 of Example 1, and FIG. 2 is a schematic sectional view taken along the line AA of FIG. 1 showing a supported state of the amorphous iron core. Since the amorphous iron core transformer 100 to be described is a single-phase device, one winding 2 is arranged at the center, and thousands of amorphous magnetic ribbons are laminated in the hollow portion of the winding 2 on the inner circumference side of the winding. The rectangular wound iron cores are arranged to form a frame-shaped iron core.

The support state of the amorphous core will be described with reference to FIG. Although not all shown in the drawing, the metal fitting protection plate 6 is brought into contact with the left and right sides of the amorphous iron core protective case 6 and the metal fitting support plate 3 is sandwiched by the upper metal fittings 4 to secure mechanical strength and rigidity. To do. Although two amorphous iron cores 1 of Example 1 are present in the depth direction of FIG. 1 (horizontal direction of FIG. 2), the number may be one or three.

Further, the iron cores 1 may be brought into contact with each other via a press board (insulating plate) 11. Further, the amorphous iron core 1 can be supported by the upper end surfaces of the amorphous iron core protection cases 6 and 7 via the amorphous iron core carrier plate 10.

The space between the amorphous core protection case 7 and the side surface of the winding 2 may be narrower. On the contrary, in the case of the oil-filled three-phase device, since another winding exists between the amorphous iron core protection case 7 and the side surface of the winding 2, the amorphous iron core protection case 7 and the winding It may be wider between the two sides.

FIG. 3 is a front view showing a state in which the winding 2 and the upper clamp 4 are removed from the amorphous iron core transformer 100. FIG. 4 is a cross-sectional view illustrating the cross-sectional structure of the amorphous iron core on the inner peripheral side of the winding wire 2 as seen from BB in FIG. The support state of the amorphous iron core protective cases 6 and 7 will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3, the lower fastening member 5 is arranged on the ground, and, as described above, the fastening metal plate 3 is applied to the left and right sides of the amorphous iron core protective cases 6 and 7, and the lower fastening members 5 sandwich them. This ensures mechanical strength and rigidity.

The lower support beam 9 is provided on the upper end surface of the lower clamp 5. Although not shown, the lower support beam 9 is supported and fixed to the lower clamp 5 via an insulator on the lower end surface of the lower support beam 9. Therefore, the amorphous core protection cases 6 and 7 can be vertically supported by the upper end surface of the lower support beam 9. Support pillars extending in the vertical direction may be arranged around the amorphous iron core protective cases 6 and 7 to more firmly support the amorphous iron core protective cases 6 and 7.

On the other hand, the amorphous magnetic ribbon has a small number of material widths, and if the iron core is made of one kind of amorphous material, it has a quadrangular cross section and the space factor becomes low. Here, the space factor indicates the ratio of the cross-sectional area of the iron core to the area of the inscribed circle of the winding 2, which is not shown. By increasing the space factor, both load loss and no load loss of the transformer can be reduced.

Further, the fastening metal plate 3 is applied to the left and right of the amorphous iron core protective cases 6 and 7 arranged so as to surround the outer periphery of the amorphous iron core 1, and the binding tape 30 is wound and fixed. Since the amorphous iron core protection cases 6 and 7 are arranged, no stress is applied to the amorphous iron core by the binding tension, and the magnetic loss does not increase.

Here, as a feature of the amorphous core protection cases 6 and 7, the inside of the case is divided into four or two blocks. Amorphous iron core protection case 6,
One block in 7 is configured to surround the amorphous iron core. Therefore, the amorphous core protection cases 6 and 7 are made of non-magnetic material such as SUS, aluminum, wood and resin, or the magnetic leg is made of a magnetic material so that it does not surround the magnetic leg one turn (one turn). It is desirable that the blocks be insulated from each other by a structure in which an insulator (for example, resin) is partially interposed.

Since the amorphous iron core 1 is surrounded by the amorphous iron core protective cases 6 and 7, the amorphous iron core can be prevented from being damaged without being exposed to the outside during manufacturing and after completion.

FIG. 5 is a front view showing a state in which the lower fastener 5 and the fastener contact plate 3 are removed from FIG. The position of the upper part of the amorphous iron core 1 is regulated by the two partition plates of the amorphous iron core carrier plate 10. On the other hand, the second yoke portion (lap portion of the amorphous magnetic ribbon) forming the lower portion of the amorphous iron core 1 does not correspond to the partition plate. Therefore, the contact plate 12 for the amorphous iron core is brought into contact with the second yoke portion, and the position of the amorphous magnetic ribbon is regulated. In addition, a member that supports the second yoke portion may be installed.

FIG. 6 is a front view showing a state in which the amorphous core protection cases 6 and 7 are removed from FIG. After inserting and wrapping the amorphous magnetic ribbon, the rectangular wound iron cores are fixed by tightening bands around them, which is not shown.

FIG. 6 is a diagram in which two frame-shaped amorphous iron cores are arranged. In each frame-shaped amorphous iron core 1, the upper part of the two horizontal sides is called the first yoke part, and the lower part is called the second yoke part. Then, the two sides in the vertical direction will be referred to as a first core portion and a second core portion. The winding 2 may be wound around the core portion.

The amorphous iron core carrier plate 10 has an arc shape at an inner peripheral side corner of the frame-shaped iron core, and contacts the amorphous iron core protection cases 6 and 7 around the arc. With such a configuration, the amorphous iron core protective cases 6 and 7 support the amorphous iron core carrier plate 10 in the vertical direction.

FIG. 7 is a front view showing a state in which the upper clamp 4 is removed from the amorphous iron core transformer 100. FIG. 8 is a cross-sectional view of the amorphous iron core transformer 100 viewed from CC in FIG. 7. The supporting state of the winding wire 2 will be described with reference to FIGS. 7 and 8.

The winding 2 has a winding receiver 13 arranged on the upper end surface of the lower clamp 5 and is fixed to the lower end surface of the winding 2 via an insulator (not shown).

The amorphous iron core protective cases 6 and 7 are supported at their upper portions by upper clamps that are brought into contact with the contact plate and sandwiched therebetween, and at their lower portions are vertically supported by lower clamps that are brought into contact with the contact plate and sandwiched. The amorphous iron core 1 is supported by the amorphous iron core carrier plate 10 and the amorphous iron core protection cases 6 and 7. Since the winding 2 is supported by the lower clamp 5 and the winding receiver 13 supported by the lower clamp 5, the winding 2 is held independently of the amorphous core protection cases 6 and 7. ing.

Therefore, the influence of the vibration of the winding wire 2 on the amorphous iron core 1 can be avoided, and an amorphous iron core transformer having excellent magnetic characteristics can be obtained. At this time, the distance of the gap between the upper end surface of the winding wire 2 and the support surface of the amorphous iron core carrier plate 10 is indicated by g1. This gap can suppress the influence of the vibration of the winding wire 2 on the amorphous iron core.

FIG. 9 is a front view showing the amorphous iron core transformer 200 of the second embodiment, and FIG. 10 is a schematic sectional view showing a supported state of the amorphous iron core as seen from DD of FIG. 9. FIG. 11 is a front view showing a state in which the upper clamp 4 is removed from the amorphous iron core transformer 200. FIG. 12 is a cross-sectional view of the amorphous iron core transformer 200 seen from EE in FIG. 11.

The difference from Example 1 is that the amorphous iron core protective cases 6 and 7 and the amorphous iron core carrier plate 10 have sufficient strength to support the laminated body of the amorphous magnetic ribbon and the amorphous iron core carrier plate 10. This is the point in which an upper support beam 14 made of metal and an amorphous iron core receiver (insulating plate) 15 supported by the upper support beam 14 are interposed.

According to the second embodiment, it is possible to avoid the influence of the vibration of the winding wire 2 on the amorphous iron core 1. Further, according to the second embodiment, since the upper support beam 14 and the amorphous core receiver 15 are provided in addition to the amorphous iron core carrier plate 10, the rigidity and strength of the iron core made of the amorphous magnetic ribbon can be increased. Further, as shown in FIG. 11, the distance of the gap between the upper end surface of the winding wire 2 and the support surface of the upper support beam 14 is indicated by g2. This gap can suppress the influence of the vibration of the winding wire 2 on the amorphous iron core.

In each of Examples 1 and 2, the amorphous iron core 1 was divided into two, and the structure was described as having two blocks. However, it is needless to say that the number of blocks may be three or more in order to further improve the space factor. is there.

FIG. 13 is a front view showing the amorphous iron core transformer 300 of the third embodiment, and FIG. 14 is a schematic cross-sectional view showing a supported state of the amorphous iron core as seen from FF in FIG. The first support member that supports the magnetic ribbon forming the amorphous iron core is composed of an amorphous iron core receiver (insulating plate) 15 and an upper support beam 14 that are in contact with the amorphous magnetic ribbon. The difference from the second embodiment is that the amorphous core transport plate 10 and the press board 11 are eliminated.

Spacers (insulating plates) 20 and 21 are inserted into the gaps generated by eliminating the amorphous iron core carrier plate 10 and the press board 11 so as not to shift in the horizontal direction. In addition, the third embodiment can also avoid the influence of the vibration of the winding wire 2 on the amorphous iron core 1.

According to the third embodiment, since the amorphous iron core carrier plate 10 is eliminated, the vertical height of the amorphous iron core transformer 300 can be reduced by the amount of the amorphous iron core carrier plate 10 and the cost can be reduced.

In each of Examples 1, 2, and 3, the amorphous iron core 1 is described as having a structure having two divided blocks, but it goes without saying that the number of blocks may be three or more in order to further improve the space factor. Further, it is needless to say that the four surfaces around the amorphous iron core 1 are covered with an insulating material (for example, insulating paper) to be insulated.

1 Amorphous Iron Core 2 Winding 3 Clamping Plate 4 Upper Clamp 5 Lower Clamp 6, 7 Amorphous Iron Protective Case 10 Amorphous Iron Carrier Plate 13 Winding Receiver 100, 200, 300 Amorphous Iron Transformer

Claims (12)

Winding and
An amorphous iron core transformer having an amorphous iron core arranged in a hollow portion of the winding,
The amorphous core is
A frame-shaped iron core configured by arranging rectangular-shaped wound iron cores in which amorphous magnetic ribbons are laminated, the first and second core portions being connected to the first and second core portions. A yoke portion and a second yoke portion connected to the first and second core portions,
A first support portion for supporting the amorphous magnetic ribbon of the first yoke portion;
An amorphous core protection case that protects the first and second core portions and supports the first support portion;
A second support portion for vertically supporting the amorphous iron core protection case;
A third support portion for supporting the winding,
An amorphous iron core transformer having: The amorphous core transformer according to claim 1,
The first support is
An amorphous iron core transformer characterized by being an amorphous iron core carrier plate in contact with the amorphous magnetic ribbon. The amorphous iron core transformer according to claim 2,
An amorphous iron core transformer characterized in that an upper support beam and an amorphous iron core receiver are arranged between the amorphous iron core carrier plate and the amorphous iron core protective case. The amorphous core transformer according to claim 1,
The first support is
An amorphous iron core transformer comprising an upper support beam and an amorphous iron core receiver. The amorphous core transformer according to claim 1,
The second support portion is
An amorphous iron core transformer, comprising a vertically extending support column that supports the amorphous iron core protection case. The amorphous iron core transformer according to claim 2,
The lower portion of the amorphous core carrier plate has an arc portion,
An amorphous iron core transformer, which is in contact with the amorphous iron core protective case around the arc portion. The amorphous core transformer according to claim 1,
The second yoke portion is a wrap portion,
An amorphous iron core transformer having an iron core contact plate that is in contact with the second yoke portion. The amorphous core transformer according to claim 1,
An amorphous iron core transformer characterized in that there is a gap between the winding and the first support portion. The amorphous core transformer according to claim 1,
The amorphous core protection case has a plurality of divided blocks,
An amorphous core transformer, wherein the amorphous magnetic ribbon is laminated on the block. The amorphous iron core transformer according to claim 9,
An amorphous iron core transformer characterized in that an insulator is interposed between the blocks. The amorphous core transformer according to claim 1,
The second support portion is
In the upper part of the amorphous core protection case,
It has an upper clamp that contacts the plate and sandwiches it.
In the lower part of the amorphous core protection case,
An amorphous iron core transformer, comprising: a lower clamp which is brought into contact with the plate and sandwiched between the plate and a lower support beam which is supported by the lower clamp. The amorphous core transformer according to claim 1,
The third support portion is
Lower clamps,
An amorphous iron core transformer comprising a winding receiver supported by the lower clamp.

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