WO2018216267A1

WO2018216267A1 - Transformer and amorphous ribbon

Info

Publication number: WO2018216267A1
Application number: PCT/JP2018/004426
Authority: WO
Inventors: 舘村　誠; 佐藤　孝平; 将阿部; 遠藤　博之; 丸山　英介; 年樹白畑; 憲一相馬; 美稀山崎; 今川　尊雄
Original assignee: 株式会社日立産機システム
Priority date: 2017-05-24
Filing date: 2018-02-08
Publication date: 2018-11-29
Also published as: TWI656545B; CN110073451B; TW201901713A; JP2018198258A; CN110073451A; JP7356785B2

Abstract

The objective of the present invention is to provide a transformer having an iron core which improves the space factor thereof. In order to solve the problem mentioned above, in an example of the present invention, the transformer is characterized by having a wound iron core and a coil wound around the wound iron core, wherein the wound iron core comprises two or more metal members aligned in the width direction of the wound iron core, and among the metal members, a first metal member is joined to a second metal member via a joining part that is thinner than the first metal member.

Description

Transformer and amorphous ribbon

The present invention relates to a transformer, an iron core, and an amorphous metal ribbon.

Patent Document 1 (Japanese Patent Laid-Open No. 58-74029) states that “a plurality of narrow-width thin plate-like first group and second group of amorphous elements arranged in the width direction are bonded to each other and cut into a predetermined length. Later, an apparatus for producing a wide-width laminated amorphous material in which both groups of amorphous materials are welded is provided. "(Specification, page 1, right column, line 18 to page 2, upper left column, line 2).

JP 58-74029 A

Of the iron cores used in transformers, those using wound iron cores are opened with a part of the laminated iron core material and a coil wound around the opened part is inserted. Thereafter, the opened portion of the iron core material is lapped.

A wound core using an amorphous magnetic ribbon (hereinafter also referred to as an amorphous ribbon, an amorphous material, or an amorphous metal ribbon) as an iron core material is called an amorphous wound core or simply an amorphous iron core.

As the capacity of an amorphous transformer having an amorphous iron core increases, the density of the magnetic flux flowing through the iron core increases. Therefore, it is necessary to increase the size of the iron core. To increase the size of the iron core, it is conceivable to increase the thickness or width of the iron core.

It is not preferable to increase only the thickness of the iron core because the thickness direction of the iron core increases. In addition, the weight of the iron core increases, but since the area that receives the weight is the width of the iron core, as the thickness increases, the stress received by the iron core increases, causing distortion and lowering the magnetic properties of the iron core.

On the other hand, it is conceivable to use a wide amorphous ribbon. However, the amorphous ribbon has a manufacturing process in which a melted amorphous metal material is brought into contact with a cooled roll member and thinned while being rapidly cooled.

Therefore, since it is necessary to simultaneously perform the cooling and spreading process of the molten amorphous metal material, it is difficult in principle to produce a wide amorphous ribbon. The width of the actually manufactured amorphous ribbon is about several tens to 200 mm.

¡Amorphous ribbons that are wider than the above, spread with cooling, vary in thickness and size. When an amorphous ribbon with a large variation in thickness and size is used as the iron core, the amount of voids in the thickness direction or radial direction in the iron core increases, the space factor of the iron core decreases, and the performance as a core tends to deteriorate. Become. Therefore, it has been difficult to manufacture an amorphous iron core having a width larger than that of the amorphous ribbon.

Patent Document 1 discloses an amorphous metal member that adheres the first group of amorphous and the second group of amorphous arranged in the width direction and welds the end portion and the intermediate surface of the first group of amorphous and the second group of amorphous. Is described.

Since the magnetic properties of the iron core depend on the space factor of the iron core, the amorphous ribbons should be as close as possible. However, the outer shape of the amorphous ribbon in the long side direction is not a linear shape, but has a curved shape called a swell, and therefore it is necessary to make it closer in consideration of the swell.

This swell may have an error of about sub-millimeters (about 0.1 to 0.9 mm) than the standard width of the amorphous ribbon even if it is a high quality amorphous ribbon. When the quality is good, it is about 0.1 mm or less.

Also, by making the distance between the undulations close to each other and making the difference in thickness from the non-overlapping portion, the space factor in the thickness direction of the iron core is lowered. Further, if the amorphous ribbons are separated so that the undulations do not overlap, the gap increases, and the space factor in the width direction of the iron core decreases.

Patent Document 1 does not consider a structure in which amorphous ribbons arranged in the width direction of the first group and the second group of amorphous are arranged.

An object of the present invention is to provide a transformer having an iron core with improved space factor.

In order to solve the above problems, a transformer according to an example of the present invention is a transformer having a wound iron core and a coil wound around the wound iron core, and the wound iron core extends in the width direction of the wound iron core. Two or more metal members are arranged, and the first metal member of the metal members is joined to the second metal member through a joint portion thinner than the first metal member.

According to the present invention, it is possible to provide a transformer that improves the space factor of the arranged amorphous ribbons.

It is a perspective view which shows the assembly of an iron core and a coil comprised by the three-phase three winding which concerns on embodiment of this invention. It is a perspective view which laminates | stacks the amorphous ribbon which concerns on the Example of this invention, and shows the structure of an iron core. It is sectional drawing of the amorphous ribbon which concerns on the Example of this invention. It is a top view which shows the example of the wave | undulation of an amorphous ribbon. It is a top view which shows the joining state of the amorphous ribbon which concerns on the Example of this invention. It is sectional drawing of the junction part of the amorphous ribbon which concerns on the Example of this invention. It is a figure which shows an example of the joining method of the amorphous ribbon which concerns on the Example of this invention. It is a figure which shows the joining cross section for every process of the joining method of the amorphous ribbon which concerns on the Example of this invention. It is a cross-sectional image of the bonded amorphous ribbon which concerns on the Example of this invention. It is a figure which shows an example of the joining method of the amorphous ribbon which concerns on the Example of this invention. It is a figure which shows an example of the joining method of the amorphous ribbon which concerns on the Example of this invention. It is a figure which shows an example of the joining method of the amorphous ribbon which concerns on the Example of this invention.

Hereinafter, examples will be described with reference to the drawings. In all the drawings, members having the same function are denoted by the same reference numerals, and repeated description thereof is omitted.

In the following embodiment, when it is necessary for the sake of convenience, the description will be divided into a plurality of sections or embodiments. However, unless otherwise specified, they are not irrelevant to each other. Some or all of the modifications, details, supplementary explanations, and the like are related.

In addition, in the following examples, when referring to the number of elements (including the number, numerical value, quantity, range, etc.), unless otherwise specified, the principle is clearly limited to a specific number, etc. The number is not limited to the specific number, and may be a specific number or more.

Similarly, in the following examples, when referring to the shape and positional relationship of components and the like, the shape and the like of the component are substantially excluding unless specifically stated or considered otherwise in principle. It shall include those that are approximate or similar to. The same applies to the above numerical values and ranges.

An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view showing an assembly 30 of a three-phase three-legged amorphous iron core and coil constituted by three-phase three-windings. In the assembly 30, a coil 40a is wound around the outer iron core 30a and the inner iron core 30b, a coil 40b is wound around the inner iron core 30b and the inner iron core 30c, and a coil 40c is wound around the inner iron core 30c and the outer iron core 30a. The outer iron core 30a is an iron core wound around the outer peripheral sides of the

inner iron cores

30b and 30c.

The width direction of the inner iron core 30b is the x-axis direction, the horizontal direction of the inner iron core 30b is the y-direction, and the vertical direction of the inner iron core 30b is the z-axis direction.

The assembly 30 can also be implemented as an oil-filled transformer that fills the assembly 30 with insulating oil or a mold transformer that covers the

coils

40a, 40b, and 40c with a mold resin.

Note that the outer iron core 30a and the

inner iron cores

30b and 30c are wound iron cores, and thus are provided with a wrapping portion, but are not shown and omitted.

Example 1 will be described with reference to FIGS.
FIG. 2 shows an inner core 30b included in the assembly 30 shown in FIG. Also, the coil 40a and the coil 40b are not shown. Although the inner iron core 30b will be described as a representative example, the outer iron core 30a and the inner iron core 30c can be implemented.

In the inner core 30b, a first amorphous ribbon 11a and a second amorphous ribbon 11b are arranged. As an example of description, the first amorphous ribbon 11a and the second amorphous ribbon 11b have the same product standard width in the x direction. As an example, since two amorphous ribbons having a product standard of 200 mm are arranged, the width of the inner iron core 30b is about 400 mm.

Here, “the width of the product standard is the same” does not mean the exact same width but is a concept including the product standard of the amorphous ribbon having the same width. That is, an amorphous ribbon having a product standard of 200 mm in width may have a part such as 199 mm or 201 mm depending on the width measurement location, but it means that the width is the same. The same applies to the case of simply indicating the same width. The swell will be described later with reference to FIG.

Further, the joint portions 21 are provided at predetermined intervals in the radial direction between the amorphous ribbon 11a and the amorphous ribbon 11b.

Although not shown, a lap portion that is a portion where the amorphous ribbon is wrapped is provided in a plane portion between the corner portions c1 and c2. As the wrapping method, so-called overlap, step wrap, or a combination of these can be used. In addition, it is also possible to provide a lap | wrap part in plane parts other than the corner parts c1 and c2.

When the joint portion 21 is not provided on the curved surface portion of the corner portions c1 and c2, or when the number of the joint portions 21 is reduced as compared with the flat surface portion, the amorphous ribbon wrinkles are less likely to occur. Further, it is possible to make the amorphous ribbon wrinkle less likely to occur by increasing the arrangement interval of the joining portions 21 of the curved surface portion than the flat surface portion. Thereby, the distortion of the curved surface part of the inner iron core 30 can be reduced, and the iron loss of the inner iron core 30b can be reduced.

Here, the curved surface portion represented by the corner portions c1 and c2 refers to a region having a curvature at a corner portion of the inner iron core 30b. A plane part means the area | region provided between a corner part and another corner part. In addition, although a wrap part will have a curvature depending on the lapping method, the wrap part which is not provided in the corner | angular part of the iron core 30b is included in the concept of a plane part.

FIG. 3 shows a cross section taken along the line aa ′ of FIG. The left side of FIG. 3 is a, and the right side is the a ′ side.
The first amorphous ribbon 11a, the first amorphous ribbon 11a, and the second amorphous ribbon 11b having the same product standard width are connected and arranged by the joint portion 21a. Indicated. The junction 21a is a portion where the first amorphous ribbon 11a and the second amorphous ribbon 11b are metal-bonded.

The joining portion 21a is a portion where a part of the first amorphous ribbon 11a and a part of the second amorphous ribbon 11b are welded and joined together by laser or electric resistance. The joining method of the joining part 21a is not particularly limited, and if it is laser joining, it can be joined intermittently by pulse irradiation.

In addition, spot bonding and other electrical resistance bonding can be used. Even when the electrical resistance is continuously applied, it can be implemented even when it is intermittently applied. Further, when electric resistance is intermittently applied, it is possible to join by spot welding.

The second layer of amorphous ribbon 20b is shown below the first layer of amorphous ribbon 20a. In the amorphous ribbon 20b of the second layer, the first amorphous ribbon 11c and the second amorphous ribbon 11d are joined.

Next, the n-th layer amorphous ribbon 20n arranged from the first layer amorphous ribbon 20a to the n-th layer includes a first amorphous ribbon 11e and a second amorphous ribbon 11f. It is joined at the junction 21n.

Here, in the amorphous ribbon 20b of the second layer, a gap 22 is shown between the first amorphous ribbon 11c and the second amorphous ribbon 11d. Since it has another part in the y-axis direction different from the aa ′ cross section shown in FIG. 3, that is, a part that is joined at the back or near side of the aa ′ cross section, the joint part is present in the aa ′ cross section. Not shown.

Such a relationship in which the first

amorphous ribbons

11a, 11c, and 11e and the second

amorphous ribbons

11b, 11d, and 11f are arranged in the width direction is referred to as abutting the opposing long sides of the amorphous ribbons. Further, the joined amorphous ribbons are referred to as butt joints through the

joint portions

21 and 21n.

As shown in the drawing, the thickness of the

junction points

21a and 21n is preferably equal to or less than the amorphous ribbon 11a or the like. If the thickness of the amorphous ribbon and the joint point is the same, the periphery of the joint point does not have a different thickness from other amorphous ribbon portions, so that the space factor can be improved when laminated as an iron core. Moreover, the part where amorphous thin strips overlap does not arise.

When bonded, amorphous amorphous ribbons will be crystallized, but the bonded amorphous ribbons are metal-bonded, resulting in a stronger connection than just contact between amorphous ribbons. The bonding strength can be adjusted by increasing / decreasing the bonding area and the number of bonding points.

Also, by reducing the area of the joint portion, the crystallization region generated by welding the amorphous ribbon can be reduced, the magnetic circuit flow can be reduced, and the loss increasing function can be reduced.

The swell will be described with reference to FIG. In FIG. 4, the first amorphous ribbon 11 a and the second amorphous ribbon 11 b are arranged in such a manner that the long sides are butted against each other in the y-axis direction. That is, the second amorphous ribbon 20b is arranged so that the first amorphous ribbon 20a is along the long side direction. Moreover, a part of the short side direction (width direction) is omitted, and the long side is enlarged.

Amorphous ribbons vary from individual to individual due to the manufacturing method. A high-quality amorphous ribbon has a width larger or smaller than the standard width by about a submillimeter. The submillimeter means less than 1 mm, specifically, about 0.1 or more and 0.9 mm or less.

It is difficult to manually match two amorphous ribbons in consideration of the above-mentioned swell. If the undulations overlap after butting, a portion having the thickness of two amorphous ribbons is simply generated.

In the case of an iron core in which about 2,000 amorphous ribbons with overlapping undulations are laminated, it causes a decrease in the space factor of the amorphous ribbon in the seat layer direction. The transformer core needs to improve the space factor of the amorphous core in the width direction, that is, reduce the butt distance, while reducing such overlapping portions of the undulations.

However, if the two amorphous ribbons are abutted apart in consideration of the undulation, the space factor in the width direction decreases. For this reason, it is important to bring the amorphous ribbons close to each other while preventing them from overlapping each other.

Here, the space factor is the ratio of the total thickness of the core members to the thickness of the entire laminated cores. That is, the smaller the voids in the iron core, the higher the space factor, and the magnetic properties of the iron core are improved. The space factor in the width direction when the amorphous ribbons are arranged is the ratio of the arranged iron core members to the gaps. That is, in FIG. 3, the width of the amorphous ribbon 11a and the ratio of the amorphous ribbon 11b and the gap 21a, and the width of the amorphous ribbon 11c and the ratio of the amorphous ribbon 11d and the gap 22 are shown.

The structure of the butt joint will be described with reference to FIGS.
FIG. 5 shows an amorphous ribbon 11b that is abutted against the amorphous ribbon 11a. Moreover, these are joined by joining

portions

22b, 22c, 22d and the like. Weld marks 41a and 41b are shown on both sides of the joint 22b.

FIG. 6 shows the cross sections of the

joint portions

22b, 22c, and 22d as b-b 'cross section, c-c' cross section, and e-e 'cross section.

In the cross section of FIG. 6b-b ', welding marks 41a and 42b are shown above the amorphous ribbon 11a. The welding marks 41a and 42b are generated by electric resistance welding, and are generated when electrodes described later are arranged and a current is passed.

The joining part 22b is provided between the

amorphous ribbons

11a and 11b, and shows that the thickness on the center side is smaller than the outside of the joining part 22b. Moreover, since the melted joint portion 22b is in a state similar to a so-called bridge, it has a curved surface shape so that the thickness gradually decreases from the outside to the center. The bridge is a state in which solder joins two members.

接合 The junction becomes a bridge due to the junction mechanism described later. Since the bonding portion 22b is thinner than the amorphous ribbon, the space factor can be improved without producing a portion where the amorphous ribbons overlap each other.

The c-c 'cross section shows an example in which no welding mark remains. Moreover, a mode that the junction part 22c is substantially the same thickness as an amorphous ribbon is shown. If the thickness of the bonded portion is equal to or less than the thickness of the amorphous ribbon, the thickness around the bonded portion is not increased at the time of lamination, so that the space factor can be improved.

In the d-d 'cross section, welding marks 41c and 41d remain on the upper surfaces of the

amorphous ribbons

11a and 11b, and the joint 22d has a gap in the center. The

amorphous ribbons

11a and 11b are connected by connecting the outer edges of the bonding portion 22d.

The joint 22d is formed when the melted amorphous material is melted and solidified. In the joining portion 22d, the abutted portion of the amorphous ribbon 11a and the amorphous ribbon 11b is melted, and the melted portion is pulled by the surface tension to the portion of the amorphous ribbon that is not melted. Since the amorphous ribbon which is not melted has a higher surface tension than the melted amorphous ribbon, a gap is formed at the center of the melted portion.

This is caused by the solidification of the melted part with this void formed. Since the maximum thickness pulled by the surface tension is the thickness of the cross section of the amorphous ribbon, the thickness of the joint portion 22d does not become larger than the thickness of the amorphous ribbon. Therefore, even if it is the junction part 22d with which the space | gap was made, it can contribute to the improvement of a space factor.

Next, the joining mechanism in the case of using electric resistance welding will be described with reference to FIGS.
A second amorphous ribbon 11 b that is abutted against the first amorphous ribbon 11 a is disposed on the insulating table 110. A positive electrode 100a is disposed above the first amorphous ribbon 11a, and a negative electrode 100b is disposed above the second amorphous ribbon 11b. The electrodes 110a and 110b are preferably in contact with the

amorphous ribbon

11a or 11b.
This is to reduce the contact resistance and increase the efficiency of electric resistance welding.

If the distance w1 between the centers of the electrode 100a and the electrode 100b is larger than the gap h between the butted

amorphous ribbons

100a and 100b, it can be implemented. When the distance w1 and the gap d are as close as possible, it becomes easy to control the current path by electric resistance welding. If distance w1> gap w2, this is possible.

Furthermore, it is desirable that the condition of w1> w3 + 2 × w2 is satisfied. w3 is the diameter of the

electrodes

100a and 100b. This is because the

electrodes

100a and 100b are not in contact with each other under this condition, and the electrode 100a and the like are not in contact with the end face of the amorphous ribbon.

When a current is passed through the

electrodes

100a and 100b, current paths are generated in the order of the electrode 100a, the first amorphous ribbon 11a, the gap h, the second amorphous ribbon 11b, and the electrode 11b. In the current path, arc discharge occurs between the

amorphous ribbons

11a and 11b. Since arc discharge occurs in the portion of the current path where the resistance is high, it occurs in the gap between the butted

amorphous ribbons

11a and 11b.

FIG. 8A shows a state in which plasma is generated in the gap by arc discharge, and the amorphous ribbon around the generated plasma is heated and melted to form a melted portion 41c.
In addition, arc discharge may occur due to contact resistance generated at a portion where the electrode 100a and the amorphous ribbon 11a are in contact with each other, and a welding mark 41a may be generated.

Next, in FIG. 8B, by continuing to pass the current, the plasma of about 2000 to 3000 ° C. increases the melting amount of the amorphous ribbon end face, and the melting part 41d increased from the melting part 41c. Indicated.

Thereafter, as shown in FIG. 8 (c), the melted amorphous ribbons are brought into contact with each other and cooled to form a joint 22e. The contact of the melted part 41d means that the melted amorphous ribbon is attracted by an electrical path, or the increased force of the melted part 41d to spread is larger than the surface tension of the end face of the amorphous ribbon. It is considered that the melting parts 41d come into contact with each other.

Here, a description will be given of the relationship between the gap h for contacting the melting part 41d and manufacturing the joined part 22e and the thickness d of the

amorphous ribbons

11a and 11b. According to experiments by the inventors, when electrical resistance welding was performed with a thickness d of 25 μm and a gap w2 of 12 μm, it was confirmed that the joint portion 22e could be suitably manufactured.

That is, it can be sufficiently implemented if the thickness d ≧ gap w2 of the

amorphous ribbons

11a and 11b. The gap w2 can be obtained by an average value obtained by measuring the end faces of the bonded amorphous ribbons. Since the amorphous ribbon has waviness, the gap w2 changes the distance between the

amorphous ribbons

11a and 11b in the long side direction.

However, since the swell is generated depending on the cooling roll for the convenience of the manufacturing process, it has periodicity. Therefore, the average value of the swell can be used as the measurement point of the gap, and the gap w2 can be obtained. Further, since the swell has periodicity as described above, the shortest point can be set as the measurement point of the gap. The cycle depends on the diameter of the cooling roll and is often about several hundred mm or less due to the convenience of the manufacturing process.

Moreover, it was confirmed by other experiments by the inventors that bonding can be performed even when the thickness d is 20 μm and the gap w2 is 40 μm. On the other hand, when the thickness d was 20 μm and the gap w2 was 50 μm, it was confirmed that the bonding was insufficient.

That is, in order to improve the space factor in the width direction of the iron core or the amorphous ribbon, it is desirable to join so as to satisfy the relationship of w2 ≦ 2 × d. It is preferable that the aspect ratio of the gap w2 and the thickness d is 1: 2 or less.

This is because, by setting this value, the melted part 41d is generated from the amorphous ribbon 11a side and the 11b side, so that the melted parts 41d can easily come into contact with each other. In addition, since the melted portions 41d are easily in contact with each other, the time for heating by electric resistance welding is shortened, so that the amorphous metal is difficult to crystallize. As a result, it contributes to the loss reduction of the wound core and the transformer.

The above conditions and the fact that the undulation of the amorphous ribbon is about submillimeters will be described.
Since the amorphous ribbon has waviness, when the gap w2 is 25 μm, the abutted amorphous ribbons may contact and overlap each other. Even in this case, it has been confirmed that when electrical resistance welding is performed under the above-described conditions, it is preferable to manufacture a joint.

The overlapping part is local, and when electric resistance welding is performed around the overlapping part, a current path is likely to be generated in the local overlapping part. This is because the overlapping portion has a smaller gap, and the current path is more likely to occur than the other portions.

In addition, since contact resistance occurs in the locally overlapping portion, plasma due to arc discharge is generated around this. The locally overlapping portion of the amorphous ribbon is heated and melted by the plasma, and the overlapping portion is melted, so that the overlapping portion disappears.

After that, it is cooled while spreading in the long side direction by the surface tension of the end face of the amorphous ribbon contacted by the melted part. This can be implemented even when there are overlapping portions. Moreover, even if there is a wave in the amorphous ribbon, it can be implemented by satisfying the above conditions. Satisfying this condition can be confirmed by measuring the width of the gap w2 between the amorphous ribbons that have been abutted.

That is, the bonded amorphous ribbon has a gap w2 smaller than the thickness d of the amorphous ribbon. Furthermore, in order to improve the space factor, the gap w2 is preferably less than or equal to half of the thickness d.

The cross section of the joint will be described using a cross-sectional image shown in FIG. A state is shown in which the second amorphous ribbon 11h butted against the first amorphous ribbon 11g is connected by the joint 22f. The position of the cross section is the d-d 'cross section of FIG. For convenience of imaging, the first amorphous ribbon 11g is cut.

There are two white lines in the thickness direction at the center 22g shown at the center of the joint 22f. The d-d ′ cross section of FIG. 5 has a gap in the center, which is shown. That is, the image on the center side from the white line of the central portion 22g is a bonded amorphous ribbon shown in the back of the gap. That is, the white line is a boundary line between the amorphous ribbon in the back of the cross section and the amorphous ribbon in the cross section.

The joining portion 22g refers to the welded portion 22f ′ of the first amorphous ribbon 11h to the welded portion (not shown) of the second amorphous ribbon 11g. Further, the thickness of the welded portion 22f ′ is larger than the thickness of the central portion 22g, and the thickness of the amorphous ribbon 11h is larger than the thickness of the welded portion 22f ′. That is, the thickness decreases in the order of the first amorphous ribbon, the first welded portion, and the central portion, and the thickness increases in the order of the central portion, the second welded portion, and the second amorphous ribbon.
By the order of the thicknesses, the joint portion has a stepped thickness, and even if distortion occurs, the stress can be received stepwise, so that the overall quality is improved.

The thickness of the

amorphous ribbons

11g and 11h is about 20 μm, and the thickness of the junction 22f is about 10 μm. Further, there is a undulation 11i between the junction 22f and the second amorphous ribbon 11h, which is not less than the thickness of the junction 22f and not more than the thickness of the second amorphous ribbon 11h. In other words, the thickness of the joining portion 22f is equal to or less than the thickness of the first amorphous ribbon 11g.

Therefore, the junction 22g is thinner than the region that does not have the

amorphous ribbon

11g or 11h junction 22g. Further, when the bonded amorphous ribbons are stacked, the cross section having no joint has a higher space factor than the cross section having the joint. By providing the bonding portion 22g, a wide amorphous ribbon can be manufactured.

Further, since a joint portion can be provided between the abutted amorphous ribbons, the gap between the abutted amorphous ribbons can be reduced, and the space factor in the width direction can be improved as compared with the prior art. Further, the amorphous ribbon is hard to come off, and the lapping operation of the manufacturing process becomes easy as a wound iron core.

In addition, although a white dot is shown in the welded portion 22f 'in the thickness direction of the joint portion 22f, it is a portion where the amorphous structure is confirmed to be a recrystallized region.

Further, when examined by micro X-ray, the welded portion showed a crystallized reaction. The size of the recrystallized grains differs between the center portion 22g side and the welded portions 22f 'on both ends of the entire joint portion 22f. It was confirmed that the central portion 22g side is less than the weld portion 22f '. In this example, the recrystallized grains can be confirmed by SEM observation near the welded portion. However, since the magnetic flux of the bonded amorphous ribbon flows in the longitudinal direction, the influence of the crystallized portion on the flow of the magnetic flux is small.

Also, the crystallized region is plastically deformed unlike amorphous. Therefore, even when the welded portion becomes thicker than the original plate thickness, the plate thickness can be reduced by crushing.

Example 2 will be described with reference to FIG. FIG. 10 shows the a-a ′ cross section of FIG. 2, but the width of the amorphous ribbon is different from FIG. Description of the same reference numerals is omitted.

In the first layer 10 ′ a, the second amorphous ribbon 11 ′ b butted against the first amorphous ribbon 11 ′ a is joined by the joint portion 21 ′ a. The second layer 10'b is joined to the second amorphous ribbon 11'd butted against the first amorphous ribbon 11'c by a joint 21'b.

The first amorphous ribbons 11'a and 11'd have the same standard width, and the second amorphous ribbons 11'b and 11'c have the same standard width. With such a width, the joint portions 21'a and 21'b are arranged alternately in the first layer 10'a and the second layer 10'b. The nth layer 10'n is repeatedly arranged. That is, the junction is arranged at a different position for each layer.

In this case, the joints are staggered in each layer, so even if stress is applied to multiple layers, the stress concentration point differs for each layer, so the stress is distributed throughout the multiple layers, so the layers are almost the same. It is harder to break than when a joint is provided at the position. In addition, since the width of the amorphous ribbon is two types, the manufacturing process is simplified, and the quality is improved when the amorphous ribbon after bonding is assembled as an iron core.

Example 3 will be described with reference to FIG. It is a modification of FIG. 10, and the width | variety of an amorphous ribbon differs for every layer.

In the first layer 10'c, the second amorphous ribbon 11'f butted against the first amorphous ribbon 11'e is joined by the joining portion 21'c. In addition, the second layer 10'd is joined to the second amorphous ribbon 11'g butted against the first amorphous ribbon 11'g by the joint 21'd. In the third layer 10 ′ e, the second amorphous ribbon 11 ′ i butted against the first amorphous ribbon 11 ′ j is joined by the joint portion 21 ′ e.

The first amorphous ribbons 11'a to 11'j have different widths according to the standard. With such a width, the joint portions 21'c to 21'e can be arranged at different positions in each layer. That is, since the step structure of the joint portion can be obtained, the strength and flexibility can be further improved than in the first embodiment. As a result, it can contribute to the improvement of the life of the assembled iron core and transformer.

Example 4 will be described with reference to FIG. It is a modification of FIG. Only the first layer 107'f is shown as a representative.

In the first layer 107′f, the first amorphous ribbon 11′k and the second amorphous ribbon 11′l are connected by the joint 21′f, and the second amorphous ribbon 11′l and the second amorphous ribbon 11′l 3 amorphous ribbons 11'm are connected by a joint 21'g.

The amorphous ribbons 11'k, 11'l and 11'm have different standard widths. According to the bonding method of the present invention, amorphous ribbons having a plurality of widths can be bonded to each other to produce a wide amorphous ribbon. Since three or more amorphous ribbons can be joined, an amorphous iron core and an amorphous transformer having a larger capacity than two butt joints can be realized.

Also, since multiple types of amorphous ribbons can be joined, an amorphous ribbon having a width suitable for the transformer capacity can be manufactured. The degree of freedom in design can be improved, and a more suitable amorphous ribbon after joining can be obtained, so that a high-quality amorphous iron core and transformer can be provided.

Each embodiment can be combined with each other. For example, the embodiment 2 or 3 can be applied to the embodiment 4, a plurality of amorphous ribbons are butt-joined, and joint portions are provided at different positions in each layer. it can. In this case, the strength and flexibility can be improved as in Example 2 or 3.

Although the amorphous ribbon has been described as a representative example for the above embodiment, the present invention can be implemented if it is a plate-like metal member such as a silicon steel plate or a grain-oriented electrical steel plate.

A wide amorphous iron core can be manufactured by these methods. In addition, since the joining portion is provided, it is difficult for the amorphous ribbon to be misaligned during the work of assembling the iron core, so that variations in iron core performance can be reduced. Furthermore, since it is not necessary to manually adjust the gap between the butted surfaces, production efficiency can be improved.

Furthermore, although the bonded portion of the amorphous ribbon that has been butted and bonded is crystallized, it is bonded with a small cross-sectional area with respect to the flow of the magnetic circuit, so that the influence of the crystallized bonded portion can be suppressed. As a result, the influence of magnetic loss can be reduced as an iron core or a transformer.

In addition, the three-phase three-legged transformer has been described, but the present invention is also applicable to a single-phase transformer and a three-phase five-legged transformer having a so-called outer iron core.

The configuration of each embodiment described above can be applied not only to the transformer and the iron core of the transformer, but also to a reactor (stationary induction device) having an iron core and a coil. Also in this case, it is possible to improve the space factor of the manufactured reactor for each iron core, and to provide a reactor having stable iron core characteristics.

11a ... 1st amorphous ribbon 11b ... 2nd amorphous ribbon 20a ... 1st layer 20b ... 2nd layer 30n ... n-

th layer

21, 22b, 22c, 22d, 22e, 22f ... Junction 30 ... Assembly 30a ...

outer iron cores

30b, 30c ...

inner iron cores

40a, 40b, 40c ...

coils

41a, 41b, 41c, 41d ... welding marks

Claims

A transformer having a wound core and a coil wound around the wound core,
The wound core has two or more metal members arranged in the width direction of the wound core,
The transformer characterized by the thickness of the 1st metal member being joined to the 2nd metal member via the junction part smaller than the thickness of the 1st metal member among the metal members.
The transformer of claim 1,
The transformer is characterized in that the metal member is an amorphous ribbon.
The transformer according to claim 2,
The transformer characterized in that the thickness of the welded portion of the joint portion is smaller than the thickness of the first metal member.
The transformer according to claim 3,
The transformer characterized by the thickness of the center part of the said junction part being smaller than the thickness of the said welding part.
The transformer according to claim 2,
Of the cross sections in the thickness direction of the wound core, the cross section having no joint has a higher space factor than the cross section having the joint.
The transformer according to claim 2,
Having a crystallized region between the first metal member and the joint;
The transformer according to claim 6, wherein
The transformer is characterized in that the crystallized region is provided more in the welded portion than in the central portion of the joint portion.
The transformer according to claim 2,
The joints are provided at predetermined intervals in the radial direction of the wound core;
The transformer is characterized in that the predetermined interval is shorter in the flat portion than in the corner portion of the wound core.
The transformer according to claim 2,
The first metal member and the second metal member have different widths,
The transformer, wherein the joint and the joint of a layer different from the layer in which the first metal member and the second metal member are arranged are arranged at different positions.
An amorphous ribbon in which a plurality of amorphous ribbons are arranged and joined,
The first amorphous ribbon and the second amorphous ribbon arranged in abutment with the first amorphous ribbon were connected via a joint portion thinner than the thickness of the first amorphous ribbon. An amorphous ribbon characterized by that.
The amorphous ribbon according to claim 7,
An amorphous ribbon having a crystallized region between the first amorphous ribbon and the joint.
The amorphous ribbon according to claim 10,
An amorphous ribbon characterized in that the thickness of the welded portion of the joint portion is smaller than the thickness of the first amorphous ribbon.
The amorphous ribbon according to claim 12,
The amorphous ribbon characterized by the thickness of the center part of the said junction part being smaller than the thickness of the said weld part.
The amorphous ribbon according to claim 13,
An amorphous ribbon characterized in that the crystallized region is provided more in the welded portion than in the central portion of the joint portion.