JP2003338418A - Manufacturing method of amorphous transformer and amorphous transformer - Google Patents

Abstract

(57) [Summary] [PROBLEMS] A method of manufacturing an amorphous transformer which makes it possible to omit redundant work steps, reduce the number of excitation annealing equipment, is effective in energy saving, reduces cost and is environmentally friendly. And an amorphous transformer. SOLUTION: In an amorphous transformer comprising an amorphous core 1 in which a plurality of amorphous magnetic material ribbons are wound in multiple layers, and a coil 2 into which the amorphous core 1 is inserted, the amorphous core 1 has heat resistant wrap. The coil 2 has a heat-resistant insulator. The end face of the coil 2 is supported by a flame-retardant seat in order to suspend the amorphous iron core 1 in the air so that no stress is applied to the iron core.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method for manufacturing the contents of an amorphous transformer, and to an amorphous transformer manufactured by this manufacturing method.

[0002]

2. Description of the Related Art An amorphous transformer (oil-filled) provided with an amorphous winding core formed by winding a plurality of thin ribbons of amorphous magnetic material and a coil into which the amorphous winding core is inserted.
Is known, and conventionally, as shown in FIG. 5, the transformer contents were manufactured by the following procedure. S201) Cut out a material from the core material. (Cutting Iron Core) S202) The cut-out iron core material is formed into a designated rectangle (U shape). (Rectangular core forming) S203) The magnetic paths of the iron core are formed by abutting or stacking rectangular shaped iron cores. (Primary Lap) S204) In order to maintain the shape of the iron core after steps S202 and S203, the iron core is held by a mold or the like. (Mounting of mold) S205) The iron core having a magnetic path formed therein is heated and a direct current magnetic field is applied to remove the distortion of the iron core. (Excitation Annealing) S206) The core holding die is removed. (Demolding) S207) A measure for preventing the amorphous core pieces from falling off from the core portion and the yoke portion is performed. (Protection of core core and yoke portion) S208) Iron core wrap portion joint open (wrap open) S209) Insert the iron core into the coil. (Coil insertion) S210) The open wraps are joined again. (Secondary Lap) S211) Take measures to prevent the amorphous fragments from falling off of the lap portion. (Protection of the iron core of the lap) S212) Attaching fasteners (attaching metal fittings)

[0003]

Conventionally, in step S2
Of the procedure from 01 to S212, lap opening (S208)
And the secondary wrap (S210) is the primary wrap (S20).
This was a work that overlapped with 3) and was a cause of increasing the number of steps.
In addition, the lap opening and secondary lap steps are stress-induced operations that cause stress on the iron core, which not only deteriorates the characteristics but also causes the generation of debris due to the brittle iron core. It was Excitation during excitation annealing
It is necessary to use the excitation circuit inserted in the iron core yoke,
This exciting circuit is normally performed in several turns for reasons such as equipment and workability. Therefore, the direct current for obtaining the required magnetizing force is large, and the excitation annealing apparatus requires a special structure. Excitation annealing in an annealing furnace is disclosed in, for example, JP-A-61-15313 and JP-A-61-179.
Although it is known from Japanese Patent No. 517, etc., heat-resistant insulators and the like have not been considered.

Therefore, the present invention proposes to carry out excitation annealing in an assembly in which an iron core is inserted in a coil using a heat-resistant insulator, and eliminates redundant work steps such as secondary lapping. In addition to the reduction, in the excitation annealing process, the capacity of the DC power source used is reduced, which simplifies the equipment and saves energy. The present invention aims to provide an improved amorphous transformer.

[0005]

SUMMARY OF THE INVENTION The present invention manufactures an amorphous transformer having an amorphous winding core formed by winding a plurality of amorphous magnetic material ribbons in multiple layers and a plurality of coils into which the amorphous winding iron core is inserted. In the manufacturing method, an assembly obtained by inserting an amorphous winding iron core into a coil is subjected to excitation annealing all at once, and is an amorphous transformer manufacturing method.

Further, the present invention is a method for manufacturing an amorphous transformer in which an unannealed amorphous winding iron core is inserted into a coil, lapped, and then annealed by excitation.

The excitation annealing is a method of manufacturing an amorphous transformer which is a direct-current excitation performed by a coil incorporated in an amorphous winding iron core.

The excitation annealing is a method of manufacturing an amorphous transformer which is processed at an annealing temperature of 200 to 300 ° C.

The present invention is an amorphous transformer that uses a heat-resistant insulator as an insulator such as a coil because it adopts the above-described manufacturing method that causes thermal stress.

The coil is an amorphous transformer characterized in that the end face is supported by a seat made of a flame-retardant material so that the amorphous core is suspended in the air so that stress is not applied to the core. is there.

When the flame-retardant seat is metallic, an insulator larger than the contact area between the seat and the coil is laid between the seat and the coil end surface so that the metal seat and the coil end surface do not contact each other. The structure is an amorphous transformer.

At least the lap portion of the amorphous wound iron core is covered with a box-shaped fastener having an inside insulated by a heat-resistant insulator to prevent scattering of amorphous fragments during actual use. It is a transformer.

The above amorphous transformer is characterized in that a box-shaped fastener is provided with a collar on a side surface to serve as a seat for receiving a coil.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described.
A method for manufacturing an amorphous transformer and an embodiment of the amorphous transformer according to the present invention will be described with reference to FIGS. 1, 2 and 3. FIG. 1 is an explanatory diagram of an assembly process of the amorphous transformer assembly of the embodiment. FIG. 2 is an explanatory diagram of the amorphous transformer assembly of the embodiment. FIG. 3 is an explanatory diagram of a countermeasure for the iron core wrap portion debris in the amorphous transformer of the embodiment.

A method of manufacturing the amorphous transformer in this embodiment will be described. In this embodiment, since the method of collectively annealing the iron core and the coil is adopted, as shown in FIG.
The procedure of 01 to S106 is performed to manufacture the transformer contents. S101) A material is cut out from the core material. (Cutting the iron core) S102) Forming the cut-out iron core material into a rectangle (U-shaped) that specifies the material (iron core rectangle forming) S103) Inserting a coil into the iron core. (Coil Insertion) S104) The magnetic paths of the iron cores are formed by abutting or stacking rectangular shaped iron cores. (Wrap) S105) Attachment of clamps and the like (attachment of metal fittings) S106) Heat and DC magnetic field are applied to the iron core having a magnetic path to remove distortion of the iron core. (Excitation Annealing) As shown in S101 to S106, in the present embodiment,
The secondary lapping work after the excitation annealing is unnecessary, and the manufacturing process can be reduced. Lower clamp 3, upper clamp 4,
Since the magnetic material is annealed by exciting after attaching the content suspending metal 6 and the like, the step of holding the iron core 1 and the jigs and tools necessary for it are not necessary. In addition, lapping before annealing, a temperature (200 to 300) lower than the conventional annealing temperature (320 ° C or higher).
Since it is annealed at (.degree. C.), embrittlement is less likely to occur, so that the need for countermeasures against iron core 1 fragment is reduced. However, even if the iron core 1 wrap located at the bottom of the transformer is in the same brittle state as the other parts, the probability of its debris generation is high and some countermeasure against debris is required, so the box-shaped one as shown in Fig. 3 By incorporating the structured heat-resistant insulator 5 inside and enclosing the iron core wrap portion with the lower clamp 3, the scattering of fragments is prevented.

Amorphous transformer of this embodiment (with oil)
As shown in the front view of FIG. 2 (a) and the top view of FIG. 2 (b), the amorphous winding iron core 1 in which a plurality of amorphous magnetic material ribbons are wound in multiple layers and the amorphous winding iron core 1 are inserted. The coil 2 is provided, and the lower clamp 3, the upper clamp 4, the content suspension 6, the tap stand 7, the primary electric wire 8, and the secondary electric wire 9 are provided. The amorphous winding iron core 1 is provided with a lower fastening member 3 in which a heat-resistant insulator 5 for preventing scattering of amorphous fragments is incorporated in a lap portion, and the coil 2 is
It has a heat resistant insulator.

Next, a method of manufacturing the coil 2 having heat resistance, which becomes a problem during excitation annealing when manufacturing the amorphous transformer of this embodiment, will be described. In the present invention, the coil is 200
Since various types of insulating paper (main insulation, P-stage insulation, S-stage insulation, etc.) used for the coil 2 as shown in FIG. 2 require heat resistance up to 300 ° C., heat-resistant insulators (polyamide insulation paper, etc.), primary The electric wires 8 and the secondary electric wires 9 are composed of heat resistant electric wires (polyamide imide wire (AIW), polyimide wire (IMW), polyamide paper rectangular wire, etc.), and adhesives, tapes, etc. having high heat resistance are also selected. In addition, other components inside the transformer shall be made of highly heat-resistant material or metal.

Next, the DC excitation power source required for the excitation annealing when manufacturing the amorphous transformer of the embodiment will be described. In this embodiment, since the coil 2 is inserted into the iron core 1 from the beginning, it is not necessary to attach an exciting circuit to the yoke portion of the iron core 1 unlike the conventional manufacturing method. Although it depends on the specifications of the amorphous transformer, the number of turns of the coil 2 is several hundred to several thousand on the high voltage side, and several ten to several hundred on the low voltage side.
When the high voltage circuit of the coil 2 is adopted as the excitation circuit, the required DC current is smaller than that required in the conventional manufacturing method, assuming that the required magnetizing force is the same ampere turn. For example, assuming that the number of turns of two coils is 1000 and the number of turns of the excitation circuit used in the conventional manufacturing method is 1, the number of turns is simply 1/1.
Only 000 direct currents are needed. As described above, in this embodiment, a large energy saving effect can be obtained at the same time as the manufacturing process is reduced.

Further, in the case of an amorphous transformer, the iron loss and the effective excitation characteristic are greatly related to the stress applied to the iron core 1. Therefore, it is necessary to adopt a method of applying no stress. As a method for this, it is necessary to receive a load not on the end surface of the iron core 1 but on the end surface of the coil so that the iron core is suspended in air so that no stress is applied to the amorphous iron core. In order to achieve this purpose, a coil support that supports the coil end surface is used.However, the extinct wood that does not have heat resistance, which is often used in conventional manufacturing methods, is carbonized during excitation annealing and its insulation performance deteriorates, resulting in dielectric breakdown. It cannot be used because it causes a problem, and it is an insulator with high heat resistance as an alternative. As shown in Fig. 2, the lower seat 3 and the upper seat 4 of the collar seat 1
0 (see FIG. 4) and a coil end surface, a heat-resistant insulator larger than the contact area of the coil is laid (not shown) so that the metal seat 10 and the coil end surface do not contact at all.

As described above, according to this embodiment, since the low temperature annealing is adopted, the iron loss and the effective magnetic excitation characteristics are not as good as those of the amorphous iron core manufactured by the conventional annealing method, but the insulation performance is deteriorated. Since high temperature annealing, which is one of the causes, is not carried out, it is possible to perform the excitation annealing in the state of the assembly in which the iron core is inserted in the coil. This is effective because it can reduce the manufacturing process and the power consumption of the equipment.

[0021]

According to the present invention, not only the number of steps is reduced by omitting the overlapping work steps such as the secondary lap, but also the capacity of the DC power supply used and the annealing temperature are reduced in the exciting annealing process. It is possible to obtain an amorphous winding core transformer and a method for manufacturing the same, which is effective in simplifying equipment and energy saving due to deterioration, cost reduction and environment.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an assembly process of an amorphous transformer assembly of an embodiment.

FIG. 2 is an explanatory view of an amorphous transformer assembly of the embodiment.

FIG. 3 is an explanatory diagram of a countermeasure for a fragment of the iron core wrap portion in the amorphous transformer of the embodiment.

FIG. 4 is a diagram showing a lower fastening member and a seat according to the embodiment.

FIG. 5 is an explanatory view of an assembly process of an amorphous transformer assembly by a conventional manufacturing method.

[Explanation of symbols]

1 Amorphous winding iron core 2 coils 3 Lower clamp 4 Upper clamp 5 Heat resistant insulation 6 Contents hanging bracket 7 tap stand 8 primary wires 9 Secondary wire 10 seat

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsutoshi Inagaki             46-1 Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata Prefecture             Hitachi Industrial Equipment Systems Co., Ltd. (72) Inventor Kunio Iwata             Chubuden, 1 Higashishinmachi, Higashi-ku, Nagoya-shi, Aichi             Power Co., Ltd. (72) Inventor Daigo Takeda             Chubuden, 1 Higashishinmachi, Higashi-ku, Nagoya-shi, Aichi             Power Co., Ltd. (72) Inventor Akihiro Niwa             Chubuden, 1 Higashishinmachi, Higashi-ku, Nagoya-shi, Aichi             Power Co., Ltd. (72) Inventor Yasuyoshi Kondo             Chubuden, 1 Higashishinmachi, Higashi-ku, Nagoya-shi, Aichi             Power Co., Ltd. F-term (reference) 5E062 AA02 AB15

Claims (9)

[Claims] 1. A method for manufacturing an amorphous transformer, comprising: an amorphous winding iron core obtained by winding a plurality of amorphous magnetic material ribbons in multiple layers; and a coil into which the amorphous winding iron core is inserted. A method for manufacturing an amorphous transformer, characterized in that the obtained assembly is collectively annealed and annealed. 2. The method for manufacturing an amorphous transformer according to claim 1, wherein the assembly is formed by inserting an unannealed amorphous winding iron core into a coil, lapping and then exciting annealing. Production method. 3. The method for manufacturing an amorphous transformer according to claim 1, wherein the excitation in the excitation annealing is direct current excitation performed by a coil incorporated in an amorphous winding iron core. . 4. The method of manufacturing an amorphous transformer according to claim 1, wherein the annealing temperature in the excitation annealing is 200.
The manufacturing method of the amorphous transformer characterized by being -300 degreeC. 5. An amorphous transformer, wherein a constituent insulator of a coil included in the amorphous transformer manufactured by the manufacturing method according to any one of claims 1 to 4 is a heat resistant insulator. 6. The coil of the amorphous transformer according to claim 5, wherein the amorphous iron core is suspended in air so that stress is not applied to the iron core, and therefore the end face is supported by a seat which is made of a flame-retardant material. Amorphous transformer characterized by 7. The amorphous transformer according to claim 6, wherein when the flame-retardant seat is made of metal, an insulator larger than the contact area of the coil is provided between the seat and the end face of the coil. An amorphous transformer characterized in that the metal seat and the coil end face have a non-contact structure. 8. The amorphous transformer according to claim 5, wherein at least a wrap portion of the amorphous winding iron core is covered with a box-shaped fastener which is insulated with a heat-resistant insulator to prevent fragment scattering. An amorphous transformer characterized by. 9. The amorphous transformer according to claim 8, wherein a flange is provided on a side surface of the box-shaped fastening member to serve as a seat for receiving the coil.