JPH1041146A - Three phase core made of amorphous magnetic alloy thin band - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a thin band to an inner circumference of an outside wound core from loosening by inserting a reinforcing board in inward contact with at least a part facing a vacant part of an outside wound core between an outside wound core and first and second inside wound cores. SOLUTION: First and second inside wound cores 3, 4 are placed in a row. A reinforcing board 5 is laid over between yoke parts 3C, 4C and between yoke parts 3D, 4D of first and second inside wound cores 3 and 4. Then, a thin band is wound on an outer circumference of the first and second inside wound cores 3, 4 for forming an outside wound core 2. In the process, the reinforcing board 5 is provided only between a yoke part of the outside wound core 2 and a yoke part of the first and second inside wound cores; however, the reinforcing board 5 can be provided to extend all over an entire circumference of an inner circumferential part of the outside wound core 2 to enclose the first and second inside wound cores 3, 4 from an outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a three-phase iron core made of an amorphous magnetic alloy ribbon used for a three-phase transformer.

[0002]

2. Description of the Related Art As a three-phase three-leg iron core (three-phase iron core) made of a ribbon of an amorphous magnetic alloy, a substantially rectangular shape is formed in a window portion of an outer wound core formed in a substantially rectangular shape. The first and second wound iron cores are arranged side by side.

FIG. 7 shows this type of three-phase iron core 1 ′ as viewed from the front. In FIG. 7, reference numeral 2 denotes a substantially rectangular outer wound iron core formed of an amorphous magnetic alloy ribbon. And 4
Are first and second inner cores formed substantially in a rectangular shape by the amorphous magnetic alloy ribbon and arranged side by side in the window of the outer core 2.

The outer wound iron core 2 has a pair of legs 2A and 2B extending parallel to each other, and a pair of yokes 2C and 2D provided to connect between one end and the other end of both legs, respectively. And The first inner core 3 has a pair of legs 3A and 3B extending in parallel with each other, and a pair of yokes 3C and 3D connecting one end and the other end of both legs, respectively. The second inner core 4 has a pair of legs 4A and 4B extending in parallel with each other, and a pair of yokes 4C and 4D connecting one end and the other end of both legs, respectively. ing.

[0005] Each of the wound iron cores is formed, for example, by forming a large number of unit laminates each formed by laminating a plurality of amorphous magnetic alloy ribbons cut to a predetermined length.
It is formed by winding around a rectangular winding frame and butt-joining or lap-joining both ends of each unit laminate. In this case, the joints of a series of unit laminated bodies constituting each core are distributed stepwise in one yoke part of each core, for example, yoke parts 2C, 3C and 4C located on the upper side in FIG. It is arranged in a state.

The first and second inner cores 3 and 4 have the same lamination surface with the yoke portions 3C and 4C provided with the joints of the unit laminates positioned on the same side. The outer winding core 2 is arranged side by side, and the outer core 2 is connected to the yoke 3C and 4C provided with the first and second inner cores. It is arranged in the state where it is located on the same side, and with the lamination surface facing the same side as the lamination surface of the first and second inner cores. After the wound cores are arranged in this manner, the entire core is carried into an annealing furnace, where annealing for removing strain is performed, and the three-phase core 1 'is completed.

In this three-phase iron core 1 ', a first winding 2A is formed by one leg 2A of the outer winding core 2 and one leg 3A of the first inner winding core 3 adjacent to the leg 2A. The wire fitting leg 1U is formed, and the second winding fitting leg 1V is formed by the adjacent legs 3B and 4A of the first and second inner cores.
Is configured. Also, the other leg 2B of the outer core and the other leg 4B of the second inner core adjacent to the leg 2B
Thus, a third winding fitting leg 1W is formed, and three-phase windings are fitted to the first to third winding fitting legs 1U to 1W, respectively.

[0008] Since the ribbon of the amorphous magnetic alloy becomes very brittle by annealing, it is inevitable that the ribbon is chipped when a winding is fitted to an iron core and fragments are generated. Since the fragments of the ribbon have conductivity, if the fragments enter the inside of the winding or the like, the insulation of the winding is threatened. So, usually,
After constructing the three-phase iron core 1 'as shown in FIG. 7, means for covering at least the lamination surface thereof is taken to prevent the strip fragments from leaking to the outside.

When fitting the winding to the iron core 1, the leg 1U
After covering ~ 1W and the yoke portions 2D, 3D, and 4D where no joint portion is provided by appropriate means (for example, taping or a cover), the joint portion of the yoke portion 2C of the outer wound core 2 is opened right and left. With the yoke 3C of the inner cores 3 and 4
4C and 4C, the winding fitting legs 1U to 1W are inserted into the windows of the first to third phase windings, respectively. Thus, the legs 1U to 1
After each of the windings is fitted to W, the joint of the yoke portions 3C and 4C of the inner cores 3 and 4 is closed, and the joint of the yoke 2C of the outer core 2 is closed. Then the yoke 2C,
3C and 4C are covered by an appropriate covering means to complete the transformer main body.

In the above description, each core is formed by winding and laminating a unit laminated body of amorphous magnetic alloy ribbons around a bobbin. In some cases, each wound core is formed by continuously winding a ribbon around a rectangular winding frame. In this case, after forming the 1st and 2nd inner cores 3 and 4 by continuously winding a ribbon around the winding frame attached to the core winding device, both inner cores are respectively Are set side by side with the laminated surfaces facing the same side, and the legs 3B and 4A are set side by side, and set on a core winding device, and a thin strip is continuously wound around the outer periphery of both inner wound cores. As a result, the outer winding core 2
To form Thereafter, the inner cores 3 and 4 and the outer core 2 are impregnated with a resin, and the resin coats the lamination surfaces of the respective cores and integrates the whole. After the impregnated resin has hardened to allow the winding to be fitted,
These legs are cut at the center in the longitudinal direction of the winding winding legs 1U to 1W to form cut cores.

[0011]

As described above, since the wound cores 2 to 4 are formed by winding a thin ribbon around a winding frame, each of the four corner portions has a curved shape. Inevitably present. Therefore, between the adjacent corner portions on the side of one of the yoke portions 3C and 4C of the first and second inner cores 3 and 4 and the one yoke portion 2C of the outer core 2 and the inner core 3 Yoke 3D and 4
Gap portions G1 and G2 are formed between adjacent corner portions on the D side and the other yoke portion 2D of the outer wound core 2, respectively.

As is well known, since the ribbon of the amorphous magnetic alloy is extremely thin and brittle, the gaps G 1 and G 2 are provided between the outer core 2 and the inner cores 3 and 4 as described above. Is present, as shown in FIG. 8 (enlarged view of the portion Z in FIG. 7), the inner periphery of the outer wound core loses support at the gaps G1 and G2, and the outer winding is wound at a position facing the gap. The ribbon located near the inner circumference of the iron core becomes slack. In the portion where the ribbon is slackened, not only a gap is formed between the ribbons but also the ribbon is bent with a small radius of curvature.

[0013] In particular, when a method is used in which a thin ribbon is continuously wound around the outer periphery of the first and second inner wound cores arranged side by side to form an outer wound core, a method for winding the thin ribbon is used. Since the outer wound core is tightly wound by the tension, the thin strip is wrinkled at a portion facing the gaps G1 and G2 in the inner peripheral portion of the outer wound core, and large slack is likely to occur.

As described above, the outer wound iron core 2 and the first and second
The inner winding cores 3 and 4 are formed of a thin ribbon of an amorphous magnetic alloy to form a three-phase iron having a structure in which the first and second inner winding cores are arranged in a window of the outer winding core. In this case, the thin strip near the inner periphery of the outer core is slackened at the gap formed between the adjacent corner part of the inner core and the yoke of the outer core, resulting in thinning. In addition to the increase in the gap between the bands, the ribbon is bent at a small curvature to increase its distortion, so that the magnetic characteristics of the iron core cannot be avoided.

Further, since the loose ribbon is damaged by a slight impact, if the iron core is handled in a state where the thin ribbon near the inner periphery of the outer wound iron core is loosened, the winding is fitted. In such a case, there is a problem that a thin strip is easily generated.

Furthermore, if the ribbon is slack in the inner periphery of the outer wound core, the ribbon vibrates when the transformer is operated,
There was also a problem that noise was generated.

An object of the present invention is to provide a thin strip near the inner periphery of an outer wound core at a position facing a gap formed between an adjacent corner portion of the first and second inner wound cores and an outer wound core. It is an object of the present invention to provide a three-phase iron core made of an amorphous magnetic alloy ribbon capable of preventing the occurrence of loosening.

[0018]

SUMMARY OF THE INVENTION The present invention relates to a substantially rectangular outer core formed by an amorphous magnetic alloy ribbon so that each corner has a curved shape; First and second inner cores each having a substantially rectangular shape, each of which is formed to have a curved shape by a band, and arranged side by side in the window of the outer core.
And a three-phase core in which a gap is formed between a corner portion adjacent to the second inner core and a yoke of the outer core.

In the present invention, there is provided a reinforcing plate which comes into contact with at least a portion of the outer wound core facing the gap to prevent loosening of the ribbon constituting the outer wound core,
The core was inserted between the outer core and the first and second inner cores.

The reinforcing plate may be formed so as to surround the first and second inner cores from the outside, that is, to extend over the entire circumference of the outer core.

In the present invention, the reinforcing plate is formed so as to have a length extending between adjacent yoke portions of the first and second inner winding cores, and the reinforcing plate is wound outside. It may be inserted between the yoke of the iron core and the yoke of the first and second inner winding cores.

As described above, the outer core and the first and second cores
Insert a reinforcing plate between the inner winding core and the reinforcing plate,
If the portion facing the gap of the outer wound core is brought into contact from the inside, it is possible to prevent the ribbon forming the outer wound core from becoming loose at the portion facing the gap of the outer wound core. Can be prevented from deteriorating the magnetic characteristics and generating noise during operation of the transformer. In addition, with the above configuration, it is possible to prevent the thin ribbon from being loosened at the portion facing the gap portion of the outer wound core, so that the thin portion is damaged at the portion facing the gap portion of the outer wound core. It is possible to prevent fragments of the crystalline magnetic alloy from being easily generated.

[0023]

FIG. 1 shows a three-phase iron core 1 according to the present invention.
In the figure, reference numeral 2 denotes a substantially rectangular outer wound core formed by an amorphous magnetic alloy ribbon,
Reference numerals 3 and 4 denote first and second inner cores, each of which is formed in a substantially rectangular shape by an amorphous magnetic alloy ribbon and arranged in the window of the outer core 2.

The outer wound core 2 has a pair of legs 2A and 2B extending parallel to each other, and a pair of yokes 2C and 2D provided to connect between one end and the other end of both legs, respectively. And The first inner core 3 has a pair of legs 3A and 3B extending in parallel with each other, and a pair of yokes 3C and 3D connecting one end and the other end of both legs, respectively. The second inner core 4 has a pair of legs 4A and 4B extending in parallel with each other, and a pair of yokes 4C and 4D connecting one end and the other end of both legs, respectively. ing. One leg 2A of the outer core 2 and one leg 3A of the first inner core 3 adjacent to the leg 2A
Form a first winding fitting leg 1U, and legs 3B and 4A adjacent to the first and second inner winding cores form a second winding fitting leg 1V. Also, the other leg 2B of the outer wound core and a second leg adjacent to the leg 2B
And the other leg 4B of the inner wound iron core constitutes a third winding fitting leg 1W.

The wound core constituting the three-phase iron core 1 shown in FIG. 1 is formed by continuously winding an amorphous magnetic alloy ribbon. When forming each wound iron core, for example, FIG.
As shown in (A) and (B), an iron core winding device provided with a disk-shaped rotary table 10 is used. Rotary table 1
No. 0 has a rotating shaft mounting hole at the center thereof, and has a pair of rotating shaft mounting holes 10a and 10b at symmetrical positions on both sides of the central rotating shaft mounting hole. The rotating shaft of the winding frame can be detachably mounted.

In manufacturing the wound iron core according to the present invention,
First, as shown in FIG. 5A, a rotary shaft Ma provided at the center of a rectangular winding frame M is mounted in a rotary shaft mounting hole at the center of the rotary table 10. Then, the tip of the amorphous magnetic alloy ribbon As is fixed to the outer peripheral portion of the winding frame M, and a rotary drive source (not shown) is operated while applying sufficient tension to the ribbon As to move the rotary table 10 as shown in the figure. Rotate in the direction of the arrow. Thus, the thin inner band As is wound around the outer periphery of the winding frame M until a predetermined winding thickness is obtained, thereby forming the first inner core 3.

After the winding of the first inner winding core 3 is completed,
The rotating shaft Ma of the other bobbin M is attached to a central rotatable shaft mounting hole of the rotary table 10, and the ribbon As is wound around the bobbin to form the second inner core 4.

After forming the second inner core 4,
The rotating shaft Ma of the bobbin M around which the inner bobbin core 4 is wound is attached to the rotatable shaft mounting hole 10b of the rotary table 10, and the rotatable shaft of the bobbin M around which the previously wound inner bobbin core 3 is wound. M
a in the rotation shaft mounting hole 10a, and FIG.
As shown in (1), the first and second inner cores 3 and 4 are arranged side by side. Next, between the yoke portions 3C, 4C of the first and second inner cores 3 and 4, and between the yoke portions 3D, 4
After arranging the reinforcing plate 5 straddling between the respective Ds, the ribbon As is wound around the outer circumferences of the first and second inner cores 3 and 4 to form the outer core 2.

As the reinforcing plate 5, a reinforcing plate having a sufficient strength for preventing the ribbon forming the outer wound core 2 from being loosened is used. As the reinforcing plate, for example, a silicon steel plate can be used.

After the winding of the outer core 2 has been completed, the entire body is put into an annealing furnace with the bobbin M still attached to the windows of the first and second inner cores to remove the distortion. For annealing. After annealing, the bobbin inside the wound cores 3 and 4 is removed to complete the three-phase iron core 1 shown in FIG. Next, the three-phase iron core is impregnated with a thermosetting resin, and the impregnated resin is cured by heating. After the resin has hardened, the legs 1U,
1V and 1W are cut along the cutting line XX at the center in the longitudinal direction, and the three-phase core 1 is divided into two E-shaped core halves to form a cut core structure.

When assembling a three-phase transformer using the three-phase core, the core 1 is divided into two E-shaped parts,
As shown in FIG. 2, the legs 1U-2 of each E-shaped part
The parts constituting W are inserted into the windows of the three-phase windings 6U to 6W and butt-joined. The assembly of the transformer in this case is
A method conventionally used in a transformer using a cut core may be used.

In the example shown in FIG. 1, the reinforcing plate 5 is provided only between the yoke portion of the outer core 2 and the yoke of the first and second inner cores. The gaps G1 and G2 may be provided so as to come into contact with the outer wound core 2 from the inner side and to prevent the ribbon forming the outer wound core from loosening.
The method of providing the reinforcing plate is not limited to the above example. For example,
As shown in FIG. 3, a reinforcing plate 7 extending over the entire inner peripheral portion of the outer wound core 2 is provided so as to surround the first and second inner wound cores 3 and 4 from the outside. Is also good. FIG. 4 shows a state in which three-phase windings 6U to 6W are fitted to the three-phase iron core of FIG.

In the above description, the core has a cut core structure. However, as shown in FIG. 6, one yoke portion 2C of the outer core 2 and the first and second inner cores 3 and 4 are provided. The present invention can also be applied to a case where a joint J is provided on each of the yoke portions 3C and 4C.

In FIGS. 1 to 6, the reinforcing plate is shown to have a considerably large thickness, but this is because the thickness of the reinforcing plate is emphasized for the sake of convenience. The thickness of the reinforcing plate does not indicate the actual thickness.

[0035]

As described above, according to the present invention, a reinforcing plate is inserted between the outer winding core and the first and second inner winding cores, and the reinforcing plate is inserted into the gap between the outer winding core. The inner part of the outer winding core is prevented from slackening at the part facing the void of the outer winding core, and the slack of the outer winding core can be prevented. Can be prevented from deteriorating the magnetic characteristics and generating noise during operation of the transformer.

Further, according to the present invention, since the slack of the ribbon can be prevented from being generated at the portion facing the gap of the outer wound core, the ribbon is damaged at the portion facing the gap of the outer wound core. In addition, it is possible to prevent fragments of the amorphous magnetic alloy from being easily generated.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration example of a three-phase iron core according to the present invention.

FIG. 2 is a front view showing a state where a winding is fitted to the iron core of FIG. 1;

FIG. 3 is a front view showing another configuration example of the three-phase iron core according to the present invention.

FIG. 4 is a front view showing a state where a winding is fitted to the iron core of FIG. 3;

FIG. 5A is an explanatory diagram showing an example of a method of winding an inner wound core used in the present invention. (B) is an explanatory view showing one example of a winding method of the outer winding core used in the present invention.

FIG. 6 is a front view showing still another configuration example of the three-phase iron core according to the present invention and windings fitted to the iron core.

FIG. 7 is a front view showing a conventional three-phase iron core.

FIG. 8 is an enlarged front view showing a portion Z in FIG. 7 in an enlarged manner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 3 phase iron core 1U, 1V, 1W winding fitting leg 2 outer core 2A, 2B leg 2C, 2D yoke 3 first inner core 3A, 3B leg 3C, 3D yoke 4 fourth 2 inner winding core 4A, 4B Leg 4C, 4D Yoke 5,7 Reinforcement plate

Claims (3)

[Claims] 1. A substantially rectangular outer core formed by an amorphous magnetic alloy ribbon so that each corner has a curved shape, and each corner curved by an amorphous magnetic alloy ribbon. A first and a second inner winding core having a substantially rectangular shape formed to have a shape and arranged side by side in a window of the outer winding core, adjacent to the first and second inner winding cores In a three-phase core in which a gap is formed between a corner portion and a yoke portion of the outer winding core, the outer winding core is configured to be in contact with at least a portion of the outer winding core facing the gap from inside. A reinforcing plate for preventing loosening of the thin ribbon to be formed is inserted between the outer core and the first and second inner cores. Three phase iron core. 2. The amorphous magnetic alloy ribbon 3 according to claim 1, wherein the reinforcing plate is formed so as to surround the first and second inner cores from the outside. Sotetsu core. 3. The reinforcing plate is formed to have a length extending between adjacent yoke portions of the first and second inner cores, and the reinforcing plate is provided with a yoke portion of the outer core. The three-phase core made of an amorphous magnetic alloy ribbon according to claim 1, wherein the three-phase core is inserted between the yoke portions of the first and second inner cores.