JP2001345219A - Amorphous iron core transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome a problem such that a stray loss occurs in an iron core supporting and winding electromagnetic mechanical force supporting metal bobbin in an amorphous iron core transformer. SOLUTION: An electromagnetic steel plate 4 having a higher relative permeability than a bobbin is disposed between the circumference of the bobbin 3 and a winding 2 to form the flow path of a leakage magnetic flux 11. By this setup, a leakage magnetic flux hardly flows through the bobbin 3. As a leakage magnetic flux hardly flows through the bobbin 3, an eddy current hardly flows in the bobbin 3, and a stray loss that occurs in the bobbin 3 can be markedly reduced. As a result, an amorphous iron core transformer can be reduced in energy loss as a whole, and a larger energy conservation effect can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stationary induction transformer, and more particularly to a so-called amorphous core transformer for use in industrial equipment or electric power in which a loss is reduced by using an amorphous magnetic alloy ribbon as an iron core.

[0002]

2. Description of the Related Art In an amorphous iron core transformer using an amorphous magnetic alloy ribbon as an iron core, the amorphous magnetic alloy ribbon has no strength. A supporting structure called a bobbin is arranged between the iron core and the winding for the purpose of receiving the force.

[0003] An amorphous iron core is used in order to increase the space factor of the iron core and windings in the tank to improve workability.
As shown in FIG. 1, it is general to use a wound core 1 having a rectangular cross section, and the bobbin 3 is also formed in a square shape in accordance with the cross section of the iron core.

A stationary induction device used for industrial equipment or electric power has a rated capacity of about 100 kVA or more and receives a large electromagnetic mechanical force from the winding 2. Therefore, the square bobbin 3 needs to have high strength.

[0005] Therefore, conventionally, as a material of the bobbin 3,
In many cases, metals such as iron, which can be easily processed and have a low cost, are used.

[0006]

The iron bobbin used in the above prior art has a structure in which a part is omitted so as not to make a round around the iron core in order to make it difficult for the circulating current generated around the iron core to flow. ing.

With this structure, the bobbin hardly causes a loss due to the circulating current, but there is a problem that stray loss occurs due to absorption of magnetic flux leaking from the winding and local eddy current flowing inside. Was.

[0008] When the rated capacity is about several hundred kVA,
The stray loss that occurred was small and did not cause any particular problems.However, when the demand for energy-saving equipment increased and the capacity of amorphous core transformers increased, it was necessary to increase the thickness to increase the bobbin strength. Since the leakage magnetic flux also increases, it is expected that the stray loss generated in the bobbin will increase as the capacity increases.

As a method of reducing the stray loss generated in the bobbin, use of an insulator such as FRP (reinforced plastic) can be considered. However, if the thickness is increased to secure the strength, the cost increases significantly. there were.

As a method of increasing the strength of the bobbin without increasing the thickness and cost of the bobbin so much, for example, use of stainless steel having a high material strength can be considered.
There is a problem that stray loss generated in the bobbin increases due to increase in electric resistance.

It is also conceivable to increase the strength and reduce the thickness by making the iron core cross-sectional shape close to a circular shape and using a circular bobbin. As a result, there is a problem that the cost increases.

The present invention has been made in view of the above points,
The purpose is to reduce the stray loss generated in the bobbin and to further reduce the loss of the entire amorphous iron core transformer without increasing the size of the tank and increasing the cost significantly.

[0013]

According to the present invention, at least a part of a conventional iron or metal bobbin is formed by using a magnetic steel sheet, an amorphous magnetic alloy foil strip, a ferrite or the like to achieve the above object. It is characterized by comprising a magnetic material having a high magnetic susceptibility.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an amorphous iron core transformer according to the present invention will be described below with reference to FIG. FIG. 1 is a schematic diagram showing a simplified part of a portion around the iron core of an amorphous iron core transformer.

In FIG. 1, an iron bobbin 3 is disposed between the amorphous iron core 1 and the winding 2 for the purpose of supporting the iron core 1 and supporting the electromagnetic mechanical force from the winding 2. The bobbin 3 is structured so as not to make a round around the iron core 1 so that a circulating current does not flow inside.

The present embodiment is characterized in that one or more electromagnetic steel sheets 4 are stacked and arranged around the iron bobbin 3.

The flow of the leakage magnetic flux near the bobbin 3 at this time will be described with reference to FIG.

In FIG. 2, the leakage magnetic flux 11 generated from the winding 2 flows toward the electromagnetic steel sheet 4 having a higher relative magnetic permeability than the iron bobbin 3, exits the inside, and then enters the iron core 1. Flow in. For this reason, magnetic flux hardly flows in the iron bobbin 3, and therefore, eddy current is hardly induced, and stray loss is suppressed.

On the other hand, the electromagnetic steel sheet 4 in which the leakage magnetic flux 11 flows inside has a structure in which the thickness in the direction perpendicular to the direction in which the magnetic flux flows is thin and eddy current is hardly generated. Does not occur.

With such a structure, the stray loss occurring near the bobbin 3 can be almost eliminated, and the loss of the amorphous core transformer as a whole can be reduced as compared with the conventional case.

The number of electromagnetic steel sheets 4 arranged around the bobbin 3 is increased in accordance with the capacity of the transformer so that the magnetic steel sheet 4 is not magnetically saturated due to an increase in the amount of leakage magnetic flux accompanying an increase in the rated capacity of the transformer. I do.

In this embodiment, an electromagnetic steel sheet is used as the magnetic material having a high relative permeability disposed around the bobbin 3. However, other than this, an amorphous magnetic alloy ribbon or ferrite can also be used. .

Further, in this embodiment, iron is used as the material of the bobbin 3. However, for example, if the bobbin 3 is made of stainless steel having higher strength, the thickness of the bobbin 3 can be made smaller than that of the case of iron. The size can be reduced.

Another embodiment of the present invention will be described with reference to FIG. The feature of this embodiment is that the electromagnetic steel sheet 4 arranged around the bobbin 3 has a height dimension larger than that of the bobbin 3. Other configurations are the same as those of the embodiment shown in FIGS.

In this embodiment, the upper and lower end portions of the magnetic steel plate 4 are separated from the upper and lower end portions of the bobbin 3, so that the leakage from the winding 2 to the magnetic steel plate 4 from the magnetic steel plate 4 to the iron core 1 When the magnetic flux 11 flows, it is possible to prevent the leakage magnetic flux 11 from flowing into the upper and lower ends of the bobbin 3 in the middle of the flow.

Therefore, the stray loss generated in the bobbin 3 can be reduced more effectively than the embodiment shown in FIGS.

The effect in the height direction of the magnetic steel sheet 4 in this embodiment can be obtained if it is larger than the bobbin 3. However, if the end of the magnetic steel sheet 4 is large enough to come into contact with the iron core 1, the size becomes larger. The effect is obtained.

While the present invention has been described with reference to several embodiments, combinations of these embodiments are also possible. Further, in each of the embodiments, the description has been given of the wound iron core type amorphous core transformer having a rectangular cross-sectional shape.

[0029]

According to the amorphous core transformer of the present invention described above, the stray loss generated in the bobbin can be reduced without significantly increasing the cost and enlarging the shape of the transformer. Loss can be reduced. Thereby, the energy saving effect of the amorphous iron core transformer can be further improved, and further downsizing and weight reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a part around an iron core of an amorphous iron core transformer in one embodiment of the present invention.

FIG. 2 is a schematic diagram showing a flow of a leakage magnetic flux near an iron core according to an embodiment of the present invention.

FIG. 3 is a schematic diagram showing a structure of a conventional amorphous iron core transformer.

FIG. 4 is a schematic diagram showing a flow of a leakage magnetic flux near an iron core of an amorphous iron core transformer according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Amorphous iron core, 2 ... Winding, 3 ... Bobbin, 4 ... Electromagnetic steel plate, 11 ... Leakage magnetic flux.

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Yoichi Tenji 46-1 Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata Prefecture Within the Industrial Equipment Group of Hitachi, Ltd. (72) Inventor Ryo Nishimizu Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata 46-1, Hitachi Industrial Machinery Group, Inc. (72) Inventor Masahisa Kuwahara 46-1, Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata Prefecture F-term, Hitachi Industrial Machinery Group F term (reference) 5E044 BA06 DA06 5E058 BB05

Claims (3)

[Claims] An amorphous core transformer using an amorphous magnetic alloy ribbon as a core for forming a magnetic path, wherein at least a part between the core and the winding is made of a magnetic material having a high relative magnetic permeability. An amorphous iron core transformer in which bobbins are arranged. 2. A magnetic body having a high relative permeability constituting at least a part of a bobbin disposed between an amorphous iron core and a winding is an electromagnetic steel sheet, an amorphous magnetic alloy ribbon or a ferrite. The amorphous core transformer according to claim 1. 3. The amorphous core transformer according to claim 1, wherein a side of the bobbin close to the winding is made of a magnetic material having a high relative magnetic permeability.