JPH0786052A - Three-phase amorphous three-leg winding core, manufacture thereof and transformer using the same - Google Patents

Abstract

PURPOSE:To prevent the generation of the breaking of cores and the generation of a large amount of fragments at the time of a combination of the cores subsequent to annealing by a method wherein two pieces of the inner cores are provided, are molded into a rectangle, the inner cores are arranged in such a way that the fellow leg parts on one side of the respective leg parts of the inner cores are adjacent to each other and the outer core is arranged in such a way as to encircle the outer peripheries of these inner cores. CONSTITUTION:Inner cores 1 and 2 are molded into a rectangle having one pair of leg parts 1a and 2a and one pair of yokes 1b and 2b, which are formed by laminating amorphous magnetic thin strips about rectangular core metals 5 and 6, and windows 1c and 2c surrounded with these leg parts and yokes. These cores 1 and 2 are suspended into an invertedly U-shaped form and are arranged in such a way that the fellow leg pars on one side of the respective leg parts of the cores 1 and 2 are adjacent to each other. On the outer peripheries of the cores 1 and 2 arranged in such a way, the cores 1 and 2 are formed into a molding die and amorphous magnetic thin strips are laminated into an invertedly U-shaped form to form an outer core 7. The core 7 also has one pair of leg parts 7a, one pair of yokes 7b and a window part 7c surrounded with these leg parts and yokes and the cores 1 and 2 are arranged on the inside of this window part 7c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-phase winding core transformer, and more particularly to a three-phase three-leg winding core transformer using an amorphous magnetic ribbon.

[0002]

2. Description of the Related Art When a three-phase three-leg iron core is made of an amorphous metal ribbon, it is made of a laminated iron core as shown in JP-A-62-249407. On the other hand, in the case of manufacturing a tripod core using a magnetic material that does not cause cracking, such as a silicon steel strip, as described in Japanese Patent Publication No. 39950/39, the inner core and the outer core are individually manufactured and annealed. After doing the combination.

[0003]

When a three-phase three-leg iron core is made of a laminated iron core using an amorphous metal ribbon, there is a problem that the number of joints increases and the iron loss deteriorates. When a technique for individually manufacturing inner and outer cores such as a three-phase tripod core using a conventional silicon steel strip is simply applied to an amorphous core,
Excitation annealing must be performed on each of the inner core and the outer core, and since the amorphous metal after annealing is extremely brittle, there is a problem that the cores are damaged and a large amount of fragments are generated during the combination after annealing.

When the iron core is inserted into the coil, the amorphous iron core is annealed and is inserted at a time without being disassembled. Therefore, the first one can be easily combined with the coil, but the inner iron core can be easily combined. The other of and
A space is required between the cores to accommodate the outer cores. In this case, it is necessary to make the iron core insertion portion of the coil large, and the entire size becomes large. Further, when exciting annealing is performed in three phases at once, the magnetic field flowing in the central core portion of the inner core is canceled by the magnetic fields generated by the left and right currents, which makes excitation annealing difficult.

An object of the present invention is to provide a three-phase amorphous tripod core which can prevent the core from being damaged and a large amount of debris generated during the combination after annealing, a method for producing the same, and a three-phase amorphous tripod core transformer using the same. To provide.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a three-phase amorphous tripod winding core having a pair of legs, a pair of yokes, and a pair of legs formed by laminating amorphous magnetic ribbons. And two yokes that are formed into a rectangular shape having a window surrounded by a yoke and are annealed so that one of the legs is adjacent to each other, and a pair of legs that are laminated with an amorphous magnetic ribbon. Portion, a pair of yokes, and an outer iron core that is formed into a rectangular shape having a window surrounded by these legs and a yoke, is annealed integrally with the inner iron core, and is arranged so as to surround the outer circumferences of the two inner iron cores. It was done.

Further, in manufacturing the iron core of the present invention, the amorphous magnetic ribbon is laminated to form a rectangular shape having a pair of legs, a pair of yokes, and a window surrounded by the legs and the yoke. To form two inner cores, and these two inner cores are arranged so that one of their legs is adjacent to each other, and these two inner cores are used as a molding die to form an amorphous magnetic ribbon. Are laminated to form an outer core by forming a rectangular shape having a pair of legs, a pair of yokes, and a window surrounded by the legs and the yoke, and the inner core and the outer core are integrally excited. It is manufactured by an annealing step.

Further, according to the present invention, the amorphous magnetic ribbons are laminated and formed into a rectangular shape having a pair of leg portions, a pair of yokes, and a window portion surrounded by the leg portions and the yokes, and each leg is annealed. The two inner cores are arranged so that one of the parts is adjacent to each other, the amorphous magnetic ribbons are laminated to have a pair of legs, a pair of yokes, and a window surrounded by these legs and the yoke. The outer iron core, which is formed into a rectangular shape and annealed to surround the outer circumferences of the two inner iron cores, one leg of the outer iron core and the leg of the inner iron core arranged inside the leg are fitted and inserted. Of the inner core arranged so as to be adjacent to the second coil in which the other leg of the outer core and the leg of the inner core arranged inside this leg are inserted. Third with legs inserted
This is a three-phase amorphous tripod core transformer made up of the coil.

[0009]

Since the inner core and the outer core are laminated with amorphous magnetic ribbons, the number of joints is small and deterioration of iron loss is prevented. Two inner cores are provided and formed into a rectangular shape. One of the legs is arranged adjacent to each other, and the outer core is arranged so as to surround the outer circumference of these inner cores, so that a tripod core can be formed. it can. Further, since the two inner cores are arranged such that one of the legs is adjacent to each other, the two inner cores are used as a molding die and the amorphous magnetic ribbon is laminated on the outer periphery thereof to form the outer cores. It can be formed and a mold can be eliminated, and the cost of manufacturing equipment can be reduced. Further, since the inner iron core and the outer iron core are integrally annealed and annealed, the assembling work of the inner iron core and the outer iron core after the annealing becomes unnecessary, and it is possible to prevent the iron core from being broken and a large amount of debris to be generated at the time of combination.

[0010]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3 show inner cores 2 and 1 formed around rectangular cored bars 5 and 6 using a strip-shaped thin plate of amorphous metal having ferromagnetism (hereinafter referred to as amorphous magnetic strip). 1 shows the step of forming the outer core 7 around the outer circumference of 1.

The inner cores 1 and 2 are rectangular cored bars 6 and 6, respectively.
Amorphous magnetic ribbon is laminated around 5 to form a rectangular shape having a pair of legs 1a and 2a, a pair of yokes 1b and 2b, and windows 1c and 2c surrounded by these legs and the yoke. . These preformed inner cores 1,
As shown in FIG. 1, the legs 2 are hung in an inverted U shape so that one of the legs is adjacent to each other, and the central cores are adjacent to each other. In the present embodiment, the metal strip 3 is wound around the innermost circumference of each inner core for the purpose of protecting the amorphous magnetic ribbon. As the metal strip 3, a silicon steel strip or
A steel strip or a stainless steel strip having a thickness that is easily deformed is used. The outermost circumference of the inner core is covered with the non-magnetic material 4.
A stainless steel strip is suitable as the non-magnetic material 4.

On the outer periphery of the inner cores 1 and 2 arranged in this way, the outer core 7 is formed by stacking amorphous magnetic ribbons in an inverted U shape using the inner cores 1 and 2 as a molding die. Since the inner cores 1 and 2 are rectangular, the outer core 7 is also the inner core 1,
It is formed into a rectangle following the outer circumference of 2. The outer iron core 7 also has a pair of leg portions 7a, a pair of yokes 7b, and a window portion 7b surrounded by these leg portions and the yoke, and the inner iron cores 1 and 2 are arranged inside the window portion 7b. In this embodiment, the metal strip 8 is wound around the innermost periphery of the outer core 7 in order to protect the innermost periphery thereof. After laminating the required number of amorphous magnetic ribbons, the metal ribbon 9 is wound to cover the outermost circumference. The metal strips 8 and 9 are wound for the purpose of protecting the amorphous magnetic thin strip of the outer iron core 7, and the material thereof is the same as the metal strip 3, that is, a silicon steel strip, or a steel strip or stainless steel having a thickness that easily deforms. Steel strip is used.

The inverted U-shaped openings of the inner iron cores 1 and 2 and the outer iron core 7 are connected to the yoke joints 1d and 2 respectively.
d and 7d. When the outer cores 7 have a predetermined number of layers, the U-shaped openings of the inner cores 1 and 2 and the outer cores 7 are closed, and the inner cores 1 and 2 and the yokes of the outer cores 7 are joined. This step will be described with reference to FIGS.

First, as shown in FIG. 2, the inner cores 1 and 2 and the outer core 7 are connected to the legs 1 and 2 of the yoke which is not joined to the metal fitting 1.
Tighten with 1, 12 and 13 and bolt 10. Thereafter, the joint is closed to form a yoke, and the yokes of the inner cores 1 and 2 and the outer core 7 are also fastened with the metal fittings 14 as shown in FIG. As a result, the inner cores 1 and 2 and the outer core 7 are integrated, and in this state, they are sent to the exciting annealing step shown in FIG.

In the excitation annealing process shown in FIG. 4, the outer core 7
Excitation annealing is performed by passing a direct current from the same direction into the respective window portions of the two inner cores 1 and 2 that are integrated with. Specifically, the conductors 15 and 16 are passed through the window and the conductors 15 and 1 are
A direct current I in which the direction of current flow is the same is applied to 6 to perform annealing in a magnetic field. By doing so, a magnetic field is generated by the direct current flowing through the conductor and annealing is performed. Inner iron core 1, 2
A magnetic field is generated in the direction of demagnetization on the left and right in the central core portion formed by the adjacent legs of the magnetic core. Therefore, the magnetic flux flows inside the inner and outer iron cores having high magnetic permeability. Further, the outer core 7 having a long circumference is excited by the magnetic field generated by the combined current of the left and right currents.

When the annealing is completed, the metal fittings 11, 12, 13 attached to the iron core, the bolt 10 and the cores 5, 6 are removed from the iron core, and as shown by hatching in FIG. At the same time, the end surface of the outer core is wrapped with a protective material 17 as a protective member. An exposed portion that exposes the joined portion of the yoke is formed on the yoke portion having the joined portion. As the material for the protective material 17, kraft paper, polyester film (PET), a composite material of kraft paper and PET, or the like is used. AA cross section of FIG. 5 in this state,
That is, the cross section of the leg portion of the tripod core is shown in FIG. In this way, the legs of the iron core are covered with the protective material 17 around the inner iron cores 1 and 2 and the outer iron core 7 which are integrated, so that the core can be prevented from being damaged when the coil is fitted. FIG. 6 shows a cross section of a portion in which the inner core and the outer core are combined, but the center leg of the tripod core in which the legs of the inner core are combined is also covered with the protective material 17 in the same manner and the same. Produces the effect of. Since the protective member has an exposed portion for exposing the joint portion of the yoke in the yoke having the joint portion, the joint portion of the yoke of the iron core can be opened in this portion to insert the coil.

A coil is fitted into each leg of the above-mentioned tripod-wound core, and then the joint of the yoke is closed, whereby a three-phase amorphous tripod-wound core transformer can be obtained. As shown in FIG. 7, the three-phase amorphous tripod winding iron core transformer of the present embodiment has a pair of leg portions, a pair of yokes, and a window portion surrounded by these leg portions and the yokes. Inner cores 1, 2 which are formed into a rectangular shape and are annealed so that one of the legs is adjacent to each other
Then, the amorphous magnetic ribbons are laminated to form a rectangular shape having a pair of leg portions, a pair of yokes, and a window portion surrounded by these leg portions and the yoke, and then annealed to form outer peripheries of the two inner cores. The outer core 7 arranged so as to surround it, the first coil 18A into which one leg of the outer core 7 and the leg of the inner core 1 arranged inside the leg are fitted, and the outer core 7 Coil 18B into which the other leg of the above and the leg of the inner core 2 arranged inside this leg are fitted and inserted
And a third coil 18C into which the legs of the inner cores 1 and 2 arranged to be adjacent to each other are fitted and inserted.

In the present embodiment, the yoke portion having the joint portion is covered with the protective material 19. The protective member 19 is mounted so as to cover the surface of the iron core in the same manner as the protective member 17 after the first coil, the second coil, and the third coil are inserted into the respective legs of the tripod core. As a result, the surface of the iron core is protected
Since it is covered with Nos. 7 and 19, even if the fragments of the amorphous material are generated, they are not scattered and a highly reliable transformer can be obtained. Further, since the inner and outer iron cores are inserted into the coil at the same time, there is no gap between the iron cores, so that the iron core insertion opening of the coil can be small. According to this embodiment, since the inner core is the frame of the outer core, the combination of the inner core and the outer core is good. Further, since the end surface of the iron core is covered with the protective material, noise from the iron core can be attenuated. The transformer of FIG. 7 is put in a tank in the subsequent process, and a final product is obtained by enclosing a refrigerant such as oil or sulfur hexafluoride gas in this tank.

[0019]

EFFECTS OF THE INVENTION According to the present invention, a three-phase amorphous tripod core capable of preventing damage to the core and generation of a large amount of debris during combination after annealing, a method for producing the same, and a three-phase amorphous tripod core using the same. You can get a transformer.

[Brief description of drawings]

FIG. 1 is a front view of a wound iron core according to an embodiment of the present invention during manufacturing.

FIG. 2 is a front view showing a state in which the linear portion other than the joint portion of the wound core of the embodiment of the present invention is fastened.

FIG. 3 is a front view showing a wound core of one embodiment of the present invention in which a joint portion is opened and a yoke portion having the joint portion is tightened.

FIG. 4 is a perspective view showing annealing in a magnetic field of a wound iron core according to an embodiment of the present invention.

FIG. 5 is a front view showing the wound core of the embodiment of the present invention after annealing, immediately before the coil insertion of the core.

FIG. 6 is a leg portion A- in FIG. 5 of the wound iron core according to the embodiment of the present invention.
It is sectional drawing of A.

FIG. 7 is a perspective view showing an outer shape of a wound core transformer according to an embodiment of the present invention.

[Explanation of symbols]

1, 2 ... Inner iron core, 3 ... Protective material, 4 ... Non-magnetic material, 5, 6
... core metal, 7 ... outer iron core, 8 ... protective material, 9 ... protective material, 10
... Bolts, 11,12,13,14 ... Clamps, 15,
16 ... Conductor, 17, 19 ... Protective material, 18 ... Coil

Claims (6)

[Claims] 1. An amorphous magnetic ribbon is laminated and formed into a rectangular shape having a pair of legs, a pair of yokes, and a window surrounded by the legs, and is annealed to form one of the legs. Two inner cores arranged so that they are adjacent to each other, an amorphous magnetic ribbon are laminated and formed into a rectangular shape having a pair of legs, a pair of yokes, and a window surrounded by these legs and the yoke. And a three-phase amorphous tripod core having an outer core that is annealed integrally with the inner core and is arranged so as to surround the outer circumferences of the two inner cores. 2. Inner cores are formed by laminating amorphous magnetic ribbons into a rectangular shape having a pair of legs, a pair of yokes, and a window surrounded by the legs and the yoke. The two inner iron cores are arranged such that one of the leg portions is adjacent to each other, and the two inner iron cores are used as a mold to stack the amorphous magnetic ribbons to form a pair of leg portions and a pair of yokes. A three-phase amorphous tripod winding characterized by forming an outer core by forming a rectangular shape having a window surrounded by these legs and a yoke, and exciting and annealing the inner core and the outer core integrally Iron core manufacturing method. 3. The two inner cores are suspended in an inverted U shape, and the outer iron cores are laminated in an inverted U shape by using this as a forming die.
When the predetermined number of laminated layers is reached, close the inverted U-shaped openings of the inner core and the outer core, and apply direct current from the same direction in the windows of the two inner cores by integrating the inner core and the outer core. Excitation annealing is performed, The manufacturing method of the three-phase amorphous tripod core according to claim 2. 4. The three-phase amorphous tripod core according to claim 1, wherein each of the two inner cores has a non-magnetic metal ribbon wound around at least one outermost circumference thereof. . 5. An amorphous magnetic ribbon is laminated to form a rectangular shape having a pair of legs, a pair of yokes, and a window surrounded by the legs, and is annealed to form one of the legs. Two inner cores arranged so that they are adjacent to each other, an amorphous magnetic ribbon are laminated and formed into a rectangular shape having a pair of legs, a pair of yokes, and a window surrounded by these legs and the yoke. And annealed, and the outer iron core arranged so as to surround the outer peripheries of the two inner iron cores, one leg of the outer iron core, and the leg of the inner iron core arranged inside the leg are fitted and inserted. A first coil, a second coil into which the other leg of the outer core and the leg of the inner core arranged inside the leg are fitted, and the inner side arranged to be adjacent to the second coil Third with the legs of the iron core inserted
Three-phase amorphous tripod core transformer, characterized by having a coil. 6. A protective material integrally surrounding the inner core and the outer core, and the protective member has an exposed portion for exposing a joint portion of the yoke in the yoke having the joint portion. 5. The three-phase amorphous tripod winding core transformer according to 5.