STATIC ELECTROMAGNETIC APPARATUS

Abstract

 The purpose of the present invention is to provide a core structure for reactor and transformer cores which is characterized in being formed from a hollow core and a rod core, and having an arbitrary number of limbs.
The core structure is provided with a plurality of hollow cores formed in the shape of a hollow, and a plurality of rod cores which are disposed between the hollow cores so as to bring the hollow surfaces thereof in opposition with each other, and wiring is wound around a part of the cores.

Description

TECHNICAL FIELD

[0001] The present invention relates to static electromagnetic apparatus such as a reactor and a transformer in which core structure is improved.

BACKGROUND ART

[0002] For static electromagnetic apparatus such as a reactor and a transformer, when configuring a core thereof, a silicon steel plate is rapped and is laminated to form it; however, the silicon steel plate has problems, for example, it has large core loss and it has large magnetostriction and makes a loud noise. Hence, there has been developed a technique to configure a core by using a thin film conductor of amorphous, FINEMET (registered trademark of Hitachi Metals, Ltd.), or the like having reduced core loss and magnetostriction.

[0003] When a core is configured using a thin film conductor of amorphous, FINEMET, or the like, it is formed by winding a plurality of times the thin film conductor on a coil former, and the core thus formed is a hollow core in which the thin film conductor is accumulated in the circumferential direction. Hence, a core to be employed in a reactor and a transformer is produced in a configuration in which a plurality of hollow cores is combined with each other.

[0004] Patent literature 1 describes an example of static electromagnetic apparatus such as a reactor and a transformer using a circumferentially accumulated hollow core.

CITATION LIST

PATENT LITERATURE

[0005] PATENT LITERATURE 1: JP-A-2010-87536

SUMMARY OF INVENTION

TECHNICAL PROBLEM

[0006] FIG 12 shows a conventional, circumferentially accumulated hollow core which is described in patent literature 1. FIG 12A shows a two-limb core in which a winding (not shown) is provided on two limb sections 1L of one circumferentially accumulated core 1, to thereby configure single-phase static electromagnetic apparatus. Incidentally, according to necessity, a gap adjusting section 7 is disposed in a part of the accumulated core depending on cases. FIG 12B is an example of the product of a three-limb core in which the limb sections 1L of two circumferentially accumulated cores 1 are arranged adjacent to each other to configure three limb sections and then three windings (not shown) are provided thereon, to thereby configure three-phase static electromagnetic apparatus.

[0007] As a result, when a core having three or more limbs is produced, a plurality of two-limb cores are combined with each other, and the shape is restricted. For example, the static electromagnetic apparatus in the shape of FIG. 12B has large lateral width and small depth; hence, to install it as apparatus, there exists a problem of installability.

[0008] The present invention has been proposed to improve the drawback described above and its object is to increase the degree of freedom of core structure.

SOLUTION TO PROBLEM

[0009] To achieve the object above, the present invention is static electromagnetic apparatus comprising a plurality of hollow cores formed in a hollow shape and a plurality of rod cores disposed between the plurality of hollow cores to bring the hollow surfaces thereof in opposition with each other, wherein a winding is provided on a part of the cores.

[0010] In this regard, the core is favorably formed by accumulating thin film conductors.

[0011] Further, it is favorable to dispose a gap adjusting section in a part of the core.

[0012] Also, it is favorable to provide a winding on a plurality of rod cores.

[0013] Moreover, it is favorable to provide a winding on a hollow core.

[0014] Additionally, it is favorable that the rod cores arranged between a plurality of hollow cores to bring the hollow surfaces thereof in opposition with each other are a plurality of rod cores connected in series to each other.

[0015] Further, it is favorable to dispose a cooler on a concentric axis with respect to the hollow cores.

ADVANTAGEOUS EFFECTS OF INVENTION

[0016] According to the present invention, by use of a rolled core produced using a thin film conductor, it is possible to produce a core having a desired number of limbs in a configuration with excellent installability.

BRIEF DESCRIPTION OF DRAWINGS

[0017] FIG 1 is a solid view showing a first embodiment of the present invention.

FIG 2 is a solid view showing a second embodiment of the present invention.

FIG 3 is a solid view showing a third embodiment of the present invention.

FIG 4 is a solid view showing a fourth embodiment of the present invention.

FIG 5 is a solid view showing a fifth embodiment of the present invention.

FIG 6A is a solid view showing a sixth embodiment of the present invention.

FIG 6B is a cross-sectional view showing the sixth embodiment of the present invention.

FIG 7 is a cross-sectional view showing a seventh embodiment of the present invention.

FIG 8A is a solid view showing an eighth embodiment of the present invention.

FIG 8B is a cross-sectional view showing the eighth embodiment of the present invention.

FIG 9 is a cross-sectional view showing a ninth embodiment of the present invention.

FIG 10 is a cross-sectional view showing a tenth embodiment of the present invention.

FIG 11 is a diagram showing an example of a hollow core.

FIG 12A is a diagram showing an example of a conventional two-limb core.

FIG 12B is a diagram showing an example of a conventional three-limb core.

DESCRIPTION OF EMBODIMENTS

[0018] Next, description will be given in detail of embodiments of the present invention by referring to the drawings.

EMBODIMENTS

[0019] FIG 1 shows a first embodiment of the present invention. In the figure, 1 is a hollow rolled core in which the central portion is a hollow and 2 is a rod rolled core, and this is an example in which a four-limb core is configured by arranging, for example, four rod cores 2 between two hollow rolled cores 1a and 1b to bring the hollow surfaces of the hollow rolled cores in opposition with each other. The hollow cores 1a and 1b and the rod rolled cores 2 are respectively formed by accumulating thin film conductors in the radial direction. When this core is employed for a transformer or a reactor, a winding is concentrically provided on four rod rolled cores 2.

[0020] Also, in static electromagnetic apparatus including a core having this shape, to adjust magnetic resistance to a desired value, connecting sections between the hollow cores 1a and 1b and the rod cores 2 may be employed as gap adjusting sections 3. For example, a gap may be disposed by completely adhering the gap adjusting section 3 or by adhering with an insulator interposed therebetween; or, by disposing a vacant space therein.

[0021] FIG 2 shows a second embodiment of the present invention. For the same components as those of the first embodiment, the same symbols are employed. In this embodiment, unlike in the embodiment of FIG 1, there is shown a two-limb core configured by piling up the rod core 2 in two stages. In this situation, a gap adjusting section 4 exists at a place where the rod cores 2 are piled up; hence, by taking measures, for example, by completely adhering this section according to necessity or by adhering with an insulator interposed therebetween; or, by disposing a vacant space therein, it is possible to adjust the gap.
According to the second embodiment, by piling up two or more rod cores 2, it is possible to arbitrarily produce the place in which the gap is disposed.

[0022] FIG 3 shows a third embodiment of the present invention. For the same components as those of the first and second embodiments, the same symbols are employed. In the embodiment of FIG 3, there is used, for example, two-limb core structure; in the situation, one limb is formed by piling up three rod cores 2b and the other one limb is formed by using one rod core 2a, to thereby configure cores. Incidentally, it is not necessarily required that the rod core 2a is configured by one rod core, and the rod core 2a may be divided like the other one limb. At the place where the rod cores 2b are piled up, a gap adjusting section 4 exists, and it is possible to adjust the gap by completely adhering this section or by interposing an insulator therebetween or by inserting a vacant space therein.

[0023] By configuring limbs by use of at least two rod cores piled up as above and one or more rod cores, it is possible to arbitrarily produce the place in which the gap is disposed. In this connection, that an arbitrary gap can be disposed means that an arbitrary B-H characteristic curve is obtained when a static electromagnetic apparatus such as a reactor, a transformer, or the like is configured by using this core.

[0024] FIG 4 is shows a fourth embodiment of the present invention. For the same components as those of the first to third embodiments, the same symbols are employed. In the present embodiment, one hollow core 1c is added to FIG 2, to implement a three-stage configuration. The present embodiment shows a two-limb core configured by employing three hollow cores 1 and four rod cores 2. A gap adjusting section 3 exists also between a hollow core 1c and the upper and lower rod cores. Also in this part, by completely adhering the section or by interposing an insulator therebetween; or by disposing a vacant space therein, it is possible to adjust the gap. By implementing the configuration as above, it is possible to arbitrarily produce the place in which the gap is disposed, in a method other than those of the second and third embodiments.

[0025] FIG 5 shows a fifth embodiment of the present invention. For the same components as those of the first to fourth embodiments, the same symbols are employed. In the present embodiment, a two-limb core is configured by employing two hollow cores and two rod cores, and this is basically the same form as for FIG 1, but differs therefrom in that cut sections are disposed in the hollow cores 1a and 1b for gap adjusting sections 5.

[0026] FIG 6 shows a sixth embodiment of the present invention. Incidentally, FIG 6A is a diagram showing a solid configuration of static electromagnetic apparatus and FIG 6B is a diagram showing an A-A crosssection of FIG 6A, and for the same components as those of the first to fifth embodiments, the same symbols are employed. The present embodiment shows a configuration implemented by disposing a winding 8 on each limbs in the cores of FIG. 1 in which four limbs are provided by using two hollow cores and four rod cores. For this configuration, to apply the present embodiment to a single-phase transformer, it is solely required that at least one of the windings is used as the primary winding and the remaining ones thereof are used as secondary windings.

[0027] Further, the present embodiment shows an example in which one winding is provided on one limb; however, if it is possible to secure insulation, a plurality of windings may be provided on one limb. FIG 7 shows a seventh embodiment of the present invention. For the same components as those of the first to sixth embodiments, the same symbols are employed. The present embodiment shows a plan view of a configuration of a three-limb core using two hollow cores and three rod cores and shows a configuration in which two windings are disposed on each limb. When the present embodiment is applied to a three-phase transformer, the respective windings are used for U, V, and W phases. Further, the present embodiment may also be applied to a single-phase transformer by using the respective windings (example: windings 9a and 9b) as the primary and secondary windings. Incidentally, when the embodiment is employed for a single-phase transformer, it is also possible as in the seventh embodiment that one winding is provided on each limb.

[0028] FIG 8 shows an eighth embodiment of the present invention. Incidentally, FIG 8A is a diagram showing a solid configuration of static electromagnetic apparatus and FIG 8B is a diagram showing a plan view of FIG. 8A, and for the same components as those of the first to seventh embodiments, the same symbols are employed. In the present embodiment, a cooler 10 is arranged on the concentric axis of the hollow core 1. By this cooler 10, it is possible to cool the windings and the cores. In this regard, this embodiment shows an arrangement of one cooler tightly close to a rod core 1a; however, it is also possible that a plurality of coolers are arranged tightly close to a rod core 1b or between two rod cores.

[0029] FIG 9 shows a ninth embodiment of the present invention. For the same components as those of the first to eighth embodiments, the same symbols are employed. The present embodiment shows a plan view of a configuration of a two-limb core using two hollow cores and two rod cores and shows a configuration in which two windings 11a and 11b are disposed on the hollow core 1. Incidentally, this configuration may be combined with that shown in the embodiment described above in which the windings 8a and 8b are disposed on the rod core 2.

[0030] FIG 10 shows a tenth embodiment of the present invention. For the same components as those of the first to ninth embodiments, the same symbols are employed. Here is shown an installation method of the static electromagnetic apparatus described in conjunction with FIGS. 1 to 9. That is, the static electromagnetic apparatus configured by standing several rod cores 2a and 2b provided with windings 8a and 8b on a hollow core 1b and by placing another hollow core 1a on upper sections thereof is housed in a case 12, and is fixed to be installed on a base 13 together with the case by use of fixing bolts 14. In this way, the cores are interposed between the case 12 and the base 13 on which the cores are attached, and then the cores are fixed.

[0031] In the embodiments above, a circular hollow core 1 is employed in any case; however, the core may be rectangle or triangle as shown in FIG 11. The magnetic material employed in this situation includes not only a thin film conductor such as amorphous, FINEMET, or the like, but it is also possible to employ an item produced by accumulating silicon steel plates or a dust core. In addition, by adopting the core of the present invention as a circuit configuration member of a power converting device or the like, it is possible to contribute to the downsizing.

INDUSTRIAL APPLICABILITY

[0032] According to the present invention, it is possible to implement static electromagnetic apparatus having excellent installability; hence, the present invention is applicable to static electromagnetic apparatus in a wide range of fields.

REFERENCE SIGNS LIST

[0033] 

1:

Hollow rolled core

2:

Rod rolled core

3, 4, 5:

Gap adjusting section

8, 9:

Winding

10:

Cooler

12:

Case 12

13:

Base 13

14:

Fixing bolt

Claims

1. Static electromagnetic apparatus comprising a plurality of hollow cores formed in a hollow shape and a plurality of rod cores disposed between the plurality of hollow cores to bring the hollow surfaces thereof in opposition with each other, wherein a winding is provided on a part of the cores.

2. Static electromagnetic apparatus according to claim 1, characterized in that the cores are formed by accumulating thin film conductors.

3. Static electromagnetic apparatus according to claim 1, characterized by comprising
a gap adjusting section in a part of the cores.

4. Static electromagnetic apparatus according to claim 1, characterized in that a winding is provided on a plurality of rod cores.

5. Static electromagnetic apparatus according to claim 1, characterized in that a winding is provided on a hollow core.

6. Static electromagnetic apparatus according to claim 1, characterized in that
the plurality of rod cores disposed between the plurality of hollow cores to bring the hollow surfaces thereof in opposition with each other are a plurality of rod cores connected in series to each other.

7. Static electromagnetic apparatus according to claim 1, characterized by comprising
a cooler on a concentric axis with respect to the hollow cores.

Drawing