JP2002057043A - Transformer and reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer and a reactor which uses FINEMET (R) and are compact and excellent in efficiency and whose cooling efficiency is high and insulation strength is large. SOLUTION: A circular FINEMET core 1 is pinched by insulation plates 2 on its both sides and supported by a cylindrical insulator 4. A stud coil 3 allows the core 1 to be pinched by the insulation plates 2 and fixed/supported thereby, and works as a coil. Because of such a structure, a compact and efficient reactor can be realized. A secondary stud coil is provided for a pulse transformer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer or a reactor using a finemet core which requires insulation and cooling using insulating oil.

[0002]

2. Description of the Related Art In pulse transformers or reactors for pulse power which require insulation and cooling using insulating oil, the balance between the saturation magnetic flux density and loss is important. The structure itself also becomes large.

[0003] The configuration of a conventional example of a general pulse transformer or reactor will be described with reference to FIG. In FIG. 9, reference numeral 91 denotes a core made of a silicon steel plate or the like, 92 denotes a primary coil, and 93 denotes a secondary coil.

As shown in FIG. 1, a pulse transformer or a reactor is formed by winding a primary coil 92 and a secondary coil 93 around a core 91 (the reactor is a primary coil 9).
2 only), generating an induced voltage by electromagnetic induction, and raising and lowering the voltage are as generally known. Since the type of the core and the method of winding the coil are generally known, the description is omitted.

The conventional pulse transformer or reactor has the above-described structure.

[0006]

In the conventional pulse transformer or reactor described above, when used for pulse power or the like, the loss increases because the saturation magnetic flux density must be increased. For a pulse transformer or a reactor having a large loss, it is necessary to add a cooling means or the like to surely and efficiently cool the pulse transformer or the reactor. As a result, there is a problem that the device becomes large in size, which affects installation space and the like, leading to an increase in cost.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a transformer or a reactor using Finemet which is compact, efficient, has a high cooling efficiency, and has a high insulation strength. And

[0008]

In order to achieve the above object,
The present invention according to claim 1 uses a finemet core in a transformer or a reactor that needs to be insulated and cooled using an insulating oil, sandwiches the finemet core with an insulator, and uses a finest core with a stud. And an insulator is fixedly supported, and a part of the coil is formed by the stud.

According to such a configuration, a compact and efficient transformer or reactor using a finemet core can be realized.

According to a second aspect of the present invention, in the transformer or the reactor according to the first aspect, a cooling space is provided between the insulator and the finemet core.

As described above, by providing the cooling space between the insulator and the fine met core, the insulating oil can flow and the cooling efficiency can be improved.

According to a third aspect of the present invention, there is provided the transformer or the reactor according to the second aspect, wherein a plurality of finemet cores are provided.

As described above, by using a plurality of finemet cores, it is possible to increase the capacitance value of the transformer or the reactance value of the reactor.

According to a fourth aspect of the present invention, in the transformer or the reactor according to any one of the first to third aspects, a through hole is provided so that insulating oil flows into the center of the finemet core. It is characterized by.

As described above, by providing the through hole so that the insulating oil flows into the center of the finemet core,
Cooling efficiency can be improved.

According to a fifth aspect of the present invention, in the transformer or the reactor according to any one of the first to fourth aspects, the stud is covered with an insulating tube.

As described above, by covering the stud with the insulating tube, the insulation strength can be increased.

According to a sixth aspect of the present invention, in the transformer or the reactor according to any one of the first to fifth aspects, an insulating cover is provided on at least a part of a periphery of the finemet core. I do.

As described above, by providing the insulating cover on at least a part of the periphery of the finemet core, arc generation due to electric field concentration can be suppressed, and the insulation strength can be increased.

According to a seventh aspect of the present invention, there is provided a transformer or a reactor according to any one of the first to sixth aspects, wherein the stud and the stud forming a part of the first coil are connected to each other. And a stud forming a part of the second coil, and a stud forming a part of the second coil is arranged outside the stud forming a part of the first coil. Features.

As described above, by configuring the stud forming the part of the second coil outside the stud forming the part of the first coil, a transformer having a high insulation strength can be provided. Can be realized.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following drawings, the same symbols indicate the same or corresponding parts.

(First Embodiment) First, a pulse transformer or a reactor according to a first embodiment of the present invention will be described. FIG. 1 shows a schematic configuration of the first embodiment and is a diagram relating to a reactor. The pulse transformer is further provided with a secondary coil.

As shown in the figure, the annular finemet core 1 is arranged so as to be sandwiched between insulating plates 2 from both sides and supported by a cylindrical insulator 4. Stud coil 3
Is mounted so that the finemet core 1 is sandwiched between the insulating plates 2 and fixedly supported, and also functions as a coil. That is, one end of the member a of the stud coil 3 is
Is electrically connected to one end of the member c, and the other end of the member c is electrically connected to the other end of the next member a by the member d, and is wound around the finemet core 1. To form Reference numeral 5 denotes an input terminal of the reactor, and reference numeral 6 denotes an output terminal of the reactor. In the case of a pulse transformer, a secondary stud coil is provided, and a secondary side input terminal and an output terminal are provided.

According to this embodiment, a compact and efficient pulse transformer or reactor for pulse power using a finemet core can be provided.

(Second Embodiment) Next, a pulse transformer or a reactor according to a second embodiment of the present invention will be described. FIG. 2 is an enlarged view showing a mounting portion of the fine met core in the second embodiment.

In the second embodiment, as shown in FIG. 2, an insulating spacer 7 is inserted between the finemet core 1 and the insulator 2 so that the insulating oil is interposed between the finemet core 1 and the insulator 2. The structure is such that traffic comes and goes.

According to this embodiment, a compact and efficient pulse transformer or reactor for pulse power using a finemet core can be provided.
Furthermore, by inserting the insulating spacer 7 so that the insulating oil flows between the fine met core 1 and the insulator 2, the cooling efficiency can be improved.

(Third Embodiment) Next, a pulse transformer or a reactor according to a third embodiment of the present invention will be described. FIG. 3 is an enlarged view showing a mounting portion of the finemet core according to the third embodiment.

In the third embodiment, as shown in FIG. 3, a plurality of finemet cores 1 are provided, and an insulating spacer 7 is provided between the finemet core 1 and the insulator 2 and between the finemet cores 1. Is inserted, so that the insulating oil flows between the finemet core 1 and the insulator 2 and between the finemet cores 1. FIG. 3 shows an example in which two finemet cores 1 are attached, but the number is not limited.

According to this embodiment, it is possible to provide a pulse transformer and a reactor for pulse power, which is compact, has high efficiency, and has high cooling efficiency using a finemet core. Further, by using a plurality of finemet cores 1, the capacitance value can be increased in the case of a transformer, and the reactance value can be increased in the case of a reactor.

(Fourth Embodiment) Next, a pulse transformer or a reactor according to a fourth embodiment of the present invention will be described. FIG. 4 is an enlarged view showing a mounting portion of a finemet core according to the fourth embodiment.

In the fourth embodiment, as shown in FIG. 4, an insulating spacer 7 is inserted between the fine met core 1 and the insulator 2 and between the fine met cores 1 to form the fine met core. 1 and the insulator 2 and between the finemet cores 1 so that the insulating oil flows between them. Further, through holes are formed in the cylindrical insulator 4 and the insulating plate 2 in contact with the center of the finemet core 1. 8 is provided.

In this embodiment, the same effect as that of the third embodiment can be obtained, and furthermore, the through hole 8 is provided at the center of the finemet core 1 so that the insulating oil flows. Thus, it is possible to provide a pulse transformer and a reactor for pulse power with higher cooling efficiency.

(Fifth Embodiment) Next, a pulse transformer or a reactor according to a fifth embodiment of the present invention will be described. FIG. 5 is an enlarged view showing a mounting portion of a finemet core according to the fifth embodiment.

In the fifth embodiment, as shown in FIG. 5, an insulating spacer 7 is inserted between the fine met core 1 and the insulator 2 so as to be in contact with the center of the fine met core 1. The structure is such that a through hole 8 is provided in the object 4 and the insulating plate 2, and further, the stud coil 3 is covered with an insulating tube 9.

In this embodiment, the same effect as that of the fourth embodiment can be obtained, and the insulating strength can be increased by covering the stud coil 3 with the insulating tube 9.

(Sixth Embodiment) Next, a pulse transformer or a reactor according to a sixth embodiment of the present invention will be described. FIG. 6 is an enlarged view showing a mounting portion of the finemet core according to the sixth embodiment.

According to the sixth embodiment, as shown in FIG. 6, an insulating spacer 7 is inserted between the fine met core 1 and the insulator 2 so as to be in contact with the center of the fine met core 1. A through hole 8 is provided in the object 4 and the insulating plate 2, the stud coil 3 is covered with an insulating tube 9, and an insulating cover 10 is provided on at least a corner portion of the outer periphery of the finemet core 1 in order to suppress arc generation due to electric field concentration. Is provided.

In this embodiment, the same effect as that of the fifth embodiment can be obtained, and further, by providing the insulating cover 10 at least at the corners of the outer periphery of the fine met core 1, the electric field concentration can be achieved. Can be suppressed and the insulation strength can be further increased.

(Seventh Embodiment) Next, a pulse transformer or a reactor according to a seventh embodiment of the present invention will be described. FIG. 7 shows a schematic configuration of the seventh embodiment and relates to a pulse transformer. FIG. 8 is an enlarged view showing a mounting portion of the fine met core in this embodiment.

According to the seventh embodiment, as shown in FIGS. 7 and 8, an insulating spacer 7 is inserted between the fine met core 1 and the insulator 2 so as to contact the center of the fine met core 1. A primary hole is formed in the mold insulator 4 and the insulating plate 2, an insulating cover 10 is provided in order to suppress arc generation due to electric field concentration, and a first coil on the low voltage side covered with an insulating tube 9 is formed. A stud coil 3A is arranged, and a secondary stud coil 3B forming a high-voltage-side second coil covered with an insulating tube 9 is arranged outside the stud coil 3A. 5A is a primary input terminal u phase, 5B is a secondary output terminal U phase, 6A is a primary input terminal v phase, 6B is 2 phase.
Next output terminal V phase. Also, in FIG.
The secondary stud coil 3A is shown by a dotted line to distinguish it from the secondary stud coil 3B. Further, the primary stud coil 3A and the secondary stud coil 3B are respectively
Similar to the stud coil 3 in the first embodiment shown in FIG. 1, the stud coils 3 are electrically connected so as to form first and second coils wound around the finemet core 1, but are adjacent to each other. The members connecting between the stud coils 3A and the members connecting the adjacent stud coils 3B (members corresponding to the member d shown in FIG. 1) and the like are not shown in FIG.

In this embodiment, the same effect as that of the sixth embodiment can be obtained, and the primary stud coil 3A forming the low-voltage first coil covered with the insulating tube 9 is arranged. By arranging the secondary stud coil 3B forming the second coil on the high voltage side covered with the insulating tube 9 on the outside thereof, a transformer having high insulation strength can be realized.

[0044]

According to the present invention, a transformer or a reactor having a compact, high-efficiency, high-cooling efficiency and a high insulation strength using a finemet core which requires insulation and cooling using insulating oil is realized. be able to.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a first embodiment of the present invention, wherein (a) is a cross-sectional view and (b) is a side view.

FIG. 2 is a cross-sectional view illustrating a configuration of a main part of a second embodiment of the present invention.

FIG. 3 is a sectional view showing a configuration of a main part according to a third embodiment of the present invention.

FIG. 4 is a sectional view showing a configuration of a main part according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view showing a configuration of a main part according to a fifth embodiment of the present invention.

FIG. 6 is a sectional view showing a configuration of a main part according to a sixth embodiment of the present invention.

FIGS. 7A and 7B are diagrams showing a schematic configuration of a seventh embodiment of the present invention, wherein FIG. 7A is a cross-sectional view and FIG.

FIG. 8 is a sectional view showing a configuration of a main part according to a seventh embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of a conventional example of a general pulse transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Finemet core 2 ... Insulating board 3 ... Stud coil 4 ... Cylindrical insulator 5 ... Input terminal 6 ... Output terminal 7 ... Insulating spacer 8 ... Through hole 9 ... Insulating tube 10 ... Insulating cover 3A ... Primary stud coil 3B ... Secondary stud coil 5A ... Primary input terminal u-phase 5B ... Secondary output terminal U-phase 6A ... Primary input terminal v-phase 6B ... Secondary output terminal V-phase

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01F 37/00 H01F 27/24 P

Claims (7)

[Claims] In a transformer or a reactor that requires insulation and cooling using an insulating oil, a finemet core is used, said finemet core is sandwiched between insulators, and said finemet core and said insulation are studded. A transformer or a reactor, wherein an object is fixedly supported and a part of a coil is formed by the stud. 2. The transformer or reactor according to claim 1, wherein a cooling space is provided between the insulator and the finemet core. 3. The transformer or reactor according to claim 1, wherein a plurality of the finemet cores are provided. 4. The transformer or reactor according to claim 1, wherein a through-hole is provided so that insulating oil flows into a center portion of the finemet core. 5. The transformer or reactor according to claim 1, wherein said stud is covered with an insulating tube. 6. An insulating cover is provided on at least a part of the periphery of the finemet core.
A transformer or a reactor according to claim 5. 7. The transformer or the reactor according to claim 1, wherein the stud comprises:
A stud forming a part of the first coil and a stud forming a part of the second coil, wherein the stud forming the part of the first coil is provided outside of the stud forming the part of the first coil. A transformer, wherein studs forming a part are arranged.