Amorphous transformer and method for manufacturing same

Abstract

Provided are an amorphous transformer having a low environmental impact at the time of manufacturing, and a method for manufacturing the amorphous transformer. In the amorphous transformer, iron loss in one portion of an amorphous iron core constituting the amorphous transformer is greater than in other peripheral portions, and the region in which the iron loss is greater has a narrower range than the other portions.

Description

Amorphous transformer and its manufacturing method

[0001] The present invention relates to an amorphous transformer and a method for manufacturing the same.

[0002] Amorphous transformers, which have multiple amorphous thin films laminated on the iron core of the transformer, are widely used due to their low power loss and excellent environmental friendliness.

[0003] It is known that in the manufacturing process, an annealing treatment is performed in which heat is applied to the amorphous iron core in order to improve the magnetic properties.

[0004] Patent Document 1 discloses the use of a formed metal fitting during annealing, while Patent Document 2 discloses a method of winding an excitation winding around an amorphous core, applying a high-frequency voltage, and annealing the core using heat generated by the core.

[0005] JP 7-220941 A JP 2018-160502 A

[0006] For annealing, Patent Document 1 discloses a method of placing the entire product in an annealing furnace. However, this method requires that the entire annealing furnace be heated to a high temperature, resulting in poor heat utilization efficiency during production and a high environmental load.

[0007] On the other hand, Patent Document 2 discloses a method of annealing by winding an excitation winding around an amorphous iron core, applying a high-frequency voltage, and using the heat generated by the iron core, which is known as high-frequency heating. With this method, only the object to be heated can be heated by high-frequency heating, similar to a microwave oven, so annealing can be performed with the minimum amount of electricity required. Therefore, this is a manufacturing method with a low environmental impact.

[0008] 2 and paragraphs 0024-0025, Patent Document 1 discloses that an iron core is tightened by using an inner peripheral formed metal fitting and an outer peripheral formed metal fitting, fastening the inner and outer peripheral formed metal fittings with bolts, and annealing the formed metal fittings together. However, the annealing method disclosed does not disclose or suggest high-frequency heating.

[0009] On the other hand, Patent Document 2 discloses an annealing method using high-frequency heating, but does not disclose or suggest the metal forming tool to be used in that case.

[0010] In view of the above circumstances, the present invention provides an amorphous transformer that is annealed by high-frequency heating and a manufacturing method thereof, in which an appropriate formed metal fitting is used during high-frequency heating, and an amorphous transformer that is realized thereby with a low manufacturing load.

[0011] An example of a means for solving the above problem is as follows.

[0012] An amorphous transformer, wherein an amorphous core constituting the amorphous transformer has a part of its circumference where the iron loss is larger than that of other parts, and the area where the iron loss is larger is smaller than that of the other parts.

[0013] According to the present invention, it is possible to provide an amorphous transformer that has a low environmental impact during production and a method for producing the same.

[0014] Further means and advantages of the present invention will become apparent throughout the entire specification below.

[0015] FIG. 1 is a diagram showing the state of an amorphous iron core during annealing in an embodiment of the present invention. FIG. 2 is a diagram showing the state of an amorphous iron core during annealing in an embodiment of the present invention. FIG. 3 is a diagram showing the state of an amorphous iron core during annealing in an embodiment of the present invention. FIG. 4 is a diagram showing the state of an amorphous iron core during annealing in an embodiment of the present invention. FIG. 5 is a diagram showing the state of an amorphous iron core during annealing in an embodiment of the present invention.

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0017] Amorphous iron cores can be used as low-loss iron cores because the loss of amorphous ribbons is one-third to one-quarter that of silicon steel sheets. As an example, a laminated structure of amorphous ribbons (with a thickness of about 0.025 mm) is suitable.

[0018] The amorphous core is formed by bundling and cutting several rolled amorphous alloy ribbons wound into a loop, stacking the cut amorphous alloy ribbons in a U-shape on a rectangular core bar, and lap-joining the ends.

[0019] After that, a magnetic field is applied in the longitudinal direction of the iron core, and the amorphous iron core is subjected to high-frequency induction heating to a high temperature of 300-400°C for heat treatment. This is the same high-frequency heating as in a microwave oven. Annealing in a magnetic field aligns the magnetic moments and fixes the axis, improving the magnetic properties.

[0020] Patent Document 1 discloses annealing using an annealing furnace. One example of a commonly used annealing furnace is one in which heat is indirectly applied to an iron core by hot air from an electric furnace, and the atmosphere inside the furnace is filled with an inert gas to prevent oxidation of the iron core and to transfer heat by the inert gas.

[0021] The furnace structure consists of a heater, a circulation fan, and a cooling unit, all of which are installed inside the furnace, and gas whose temperature has been adjusted by the heater and cooling units is circulated inside the furnace by the circulation fan. This method of indirectly applying heat to the iron core with hot air from an electric furnace takes a long time to reach the specified heat treatment conditions, and in order to meet the recent demand for reduced power consumption, it is necessary to reduce this energy loss.

[0022] On the other hand, Patent Document 2 proposes a manufacturing method in which an excitation winding is wound around an amorphous core and a high-frequency voltage is applied to anneal the core by the heat generated by the core, but does not mention a member for holding the core in this process.

[0023] 2 and paragraphs 0024-0025, Patent Document 1 discloses that an iron core is tightened by using an inner peripheral formed metal fitting and an outer peripheral formed metal fitting, fastening the inner and outer peripheral formed metal fittings with bolts, and annealing the formed metal fittings together. However, the annealing method disclosed does not disclose or suggest high-frequency heating.

[0024] In other words, it was found that those skilled in the art have not yet conducted appropriate studies regarding appropriate metal forming tools for annealing using high-frequency voltage, in other words, high-frequency heating or high-frequency annealing, and this has been a major gap in the practical application of high-frequency heating to the manufacture of amorphous iron cores.

[0025] The amorphous magnetic ribbon that forms the amorphous core is hard and brittle. Furthermore, because it is formed by stacking hundreds of ribbons, each 25 μm thick, for example, it lacks sufficient mechanical strength and rigidity, making it difficult for the core to stand on its own. Therefore, when performing high-frequency heating or high-frequency annealing, it is extremely important to consider the appropriate forming metal.

[0026] 1 is an explanatory diagram of a transformer during annealing in one embodiment of the present invention. Reference numeral 1 denotes an amorphous core, 10 denotes an outer support member, 11 denotes an inner support member, and 15 denotes a fastening bolt. The outer support member 10 and the inner support member 11 are fastened together by a fastening bolt 15. Note that the fastening bolt 15 is insulated by itself using an insulating material or by combining a washer and a hole as a space around the bolt.

[0027] The amorphous core, in other words, the many laminated amorphous thin films, is sandwiched and clamped between the outer support member 10 and the inner support member 11. In this state, the amorphous core 1 is subjected to heat treatment at 300 to 400°C by annealing with a high frequency voltage, in other words, high frequency heating or high frequency annealing.

[0028] In this embodiment, the shapes of the outer support member 10 and the inner support member 11 used at this time are a major feature.

[0029] That is, the outer support member 10 is configured as four separate parts. As a result, they are configured so that they are not electrically connected to each other. In other words, it can be said that there is a non-forming region in the circumferential direction.

[0030] On the other hand, the inner support member 11 is provided so that there is a non-forming region in a part of its circumference. In the case of Figure 1, it has a shape like an inverted letter C, and the opening of the C is the non-forming region. In other words, this can also be expressed as having a non-forming region in the circumferential direction.

[0031] Whether or not there is a non-forming region in the circumferential direction of the support member does not matter in annealing using an annealing furnace such as that disclosed in Patent Document 1. This is because the entire annealing furnace is in an atmosphere of the same temperature.

[0032] On the other hand, in the case of heating by applying a high frequency voltage as disclosed in Patent Document 2, special consideration must be given to the shape of the support member, because otherwise high frequency heating itself will not be possible.

[0033] The necessary conditions and the reasons for them are explained below.

[0034] <Condition 1> The outer support member has a non-forming area.

[0035] <Reason 1> During high-frequency heating, high-frequency waves are introduced into the amorphous iron core 1 through the non-forming region of the outer support member. Therefore, if the outer support member does not have a non-forming region, high-frequency waves cannot be introduced, and high-frequency heating will not work in principle.

[0036] <Condition 2> The inner support member has a non-forming region.

[0037] <Reason 2> If the inner support member does not have a non-formed region, the current excited in the amorphous core 1 by high frequency waves will form a current loop in the inner support member, and will hardly flow through the amorphous core 1. As a result, high frequency heating will not be possible.

[0038] This is because the outer support member and the inner support member are both made of metal and have a thickness of several mm to several cm, while the amorphous thin film that forms the amorphous core is several tens of μm thick, a difference of two to three orders of magnitude.

[0039] <Condition 3> The inner support member is integrally formed across multiple sides.

[0040] <Reason 3> When heated in an annealing furnace, the temperature of the amorphous core 1 rises gradually and uniformly throughout. On the other hand, when high-frequency heating is used, the temperature of the amorphous core 1 rises rapidly, and the rate of temperature rise differs between the inner and outer periphery of the amorphous core 1. This is because the length (periphery) of the amorphous thin film on the inner periphery is structurally shorter than the length (periphery) of the amorphous thin film on the outer periphery. As a result, the length of the object to be heated is shorter on the inner periphery than on the outer periphery, and as a result, even with the same high frequency, the temperature rises more rapidly on the inner periphery than on the outer periphery.

[0041] Therefore, we found that high-frequency heating has the problem of easily changing the shape of the inner circumference, and to address this issue, it is necessary to form the inner support member integrally across multiple sides in practice, which makes it possible to reliably support the shape, especially in the corners.

[0042] The inventors have discovered that in order to put into practical use a manufacturing method for annealing the iron core of an amorphous transformer using high-frequency heating, and an amorphous transformer manufactured by this manufacturing method, it is essential to simultaneously achieve the above conditions 1 to 3.

[0043] Therefore, this embodiment and the following embodiments all describe a method for manufacturing an amorphous transformer using a support member shaped to simultaneously achieve the above conditions 1 to 3, and also describe the amorphous transformer manufactured thereby.

[0044] An example of a method for manufacturing the amorphous transformer of the present invention is as follows.

[0045] A method for manufacturing an amorphous transformer in which an amorphous iron core is annealed by high-frequency induction heating, wherein an annealing jig is used for the annealing, the annealing jig having an outer support member with a non-forming region, an inner support member with a non-forming region, and a fastener for fastening the outer support member and the inner support member while ensuring insulation between them, and the inner support member is formed integrally across multiple sides.

[0046] By applying this manufacturing method, annealing of amorphous iron cores using high-frequency induction heating can be put into practical use. This will enable amorphous transformers to have low loss and a low environmental impact as a product, and will also reduce the environmental impact during manufacturing, making it possible to provide transformers with excellent environmental performance throughout their lifecycle.

[0047] Whether induction annealing was performed using the support members described above during the manufacturing process can be confirmed by examining the iron loss of the finished amorphous core. That is, when an outer support member and an inner support member such as those shown in Figure 1 are used, subtle differences in iron loss will occur depending on the location. For example, in the case of an amorphous core, the non-forming region of the inner support member, i.e., the portion corresponding to the opening of the C-shape, will have slightly higher iron loss than other regions.

[0048] This is because the final annealing temperature during induction annealing is higher in the area where the thick inner support member made of metal is located due to its heat capacity, and therefore annealing proceeds more rapidly.

[0049] Of course, such differences can be eliminated by carrying out annealing for an extremely long period of time, but this will result in additional power consumption, so it is necessary to balance the increase in power consumption during production with the reduction in loss during use, and optimize the manufacturing conditions to reduce the environmental impact throughout the entire life cycle.

[0050] Therefore, an amorphous transformer that uses a support member that satisfies the above three conditions and is annealed by high-frequency heating will have the following characteristics.

[0051] An amorphous transformer, wherein an amorphous core constituting the amorphous transformer has a part of its circumference where the iron loss is larger than that of other parts, and the area where the iron loss is larger is smaller than that of the other parts.

[0052] Here, a desirable structure for the iron core of the amorphous transformer in this embodiment will be mentioned.

[0053] To smooth the magnetic flux distribution inside the core, it is desirable for an amorphous core made by laminating amorphous thin films to have a wrap structure that includes overlap junctions and step lap junctions, with the distance between the wrap ends increased inside the core and shortened toward the periphery, as this allows for a smoother magnetic flux distribution inside the core.

[0054] Furthermore, it is more desirable for the inner support member 11 in this embodiment to have rounded corners or curvature as shown in Fig. 1. This is because the shape can be more reliably maintained during annealing of the amorphous core.

[0055] Furthermore, some of the features of the shape of FIG. 1 can also be expressed as follows.

[0056] The structure is designed to prevent the formation of a loop that surrounds the amorphous iron core with metal, thereby preventing circulating current. Also, the support member has a non-forming area, or is shaped like a ring, or has a shape that removes part of the ring, so that it does not form a loop like the iron core.

[0057] Furthermore, some of the features of the shape of FIG. 1 can also be explained as follows.

[0058] When a core is annealed by induction heating using an applied high-frequency voltage, the magnetic flux density tends to be higher on the inner periphery, where the magnetic path is shorter, and lower on the outer periphery, where the magnetic path is longer. This causes a gradient in the iron loss value between the inner and outer periphery, a characteristic of annealing using high-frequency excitation. Furthermore, because there are areas where the core support member is not in contact with the core, a localized temperature distribution occurs, and the iron loss value changes only in areas excluding the inner annular area.

[0059] Therefore, in an iron core using the technical idea disclosed in this embodiment, in addition to the inclination of the inner and outer peripheries, local iron loss changes occur. Therefore, it can be said that a transformer employing this patent is a transformer equipped with a wound core having one or more portions in which the magnetic properties of the inner periphery of the wound core are lowered in the circumferential direction.

[0060] As mentioned earlier, the iron loss in the portion corresponding to the mouth of the C is slightly larger than in other regions. This is because the final annealing temperature during induction annealing is higher in the area where the thick metallic inner support member is located due to its heat capacity, and therefore annealing progresses more.

[0061] The same concept applies to an amorphous transformer that uses the inner and outer support members of the configuration shown in Figure 1 and is annealed by high-frequency heating, and the following situation is shown.

[0062] That is, in an amorphous transformer, the amorphous core that constitutes the amorphous transformer has iron loss in a part of its circumference that is greater than in other parts, and the area where the iron loss is greater is smaller than the other parts.

[0063] Furthermore, the amorphous transformer has an iron loss gradient between the inner and outer circumferential sides of the amorphous core.

[0064] Furthermore, the regions where the iron loss is larger than other parts of the circumference are amorphous transformers on both the inner and outer circumferential sides.

[0065] Furthermore, the locations of the regions where the iron loss is larger than other parts of the circumference are amorphous transformers located on different sides in the circumferential direction, on the inner and outer circumferential sides.

[0066] Furthermore, the regions where the iron loss is larger than other parts of the circumference are the amorphous transformers located at the edges on the inner periphery and at the corners on the outer periphery.

[0067] The manufacturing method can also be expressed as follows:

[0068] The method for manufacturing an amorphous transformer includes a step of applying high frequency to an amorphous core to anneal it, and in this step, an inner support member, an outer support member, and a fastening jig that fastens the inner support member and the outer support member in an insulated state are used, and both the inner support member and the outer support member have non-forming areas, and the inner support member is integrally formed with multiple sides.

[0069] Furthermore, the method for manufacturing an amorphous transformer is such that the outer support members are arranged in areas other than the corners and the inner support members are arranged in areas including the corners.

[0070] Fig. 2 is a view corresponding to Fig. 1. The difference from Fig. 1 is the shape of the inner support member 11. In Fig. 1, the inner support member 11 has an inverted C-shape with a portion of the left side of the drawing unformed, but in Fig. 2, there are two unformed regions, and the inner support member 11 has a C-shape that faces each other above and below.

[0071] The shape of FIG. 2 has the same effects as those described in the first embodiment, and has the advantage that the position and fastening force of the inner support member 11 can be adjusted more easily than in the shape of FIG.

[0072] In terms of the manufacturing method, the manufacturing method of the amorphous transformer disclosed in the first embodiment is a manufacturing method of an amorphous transformer having a plurality of inner support members.

[0073] Figure 3 is a view corresponding to Figure 2. The difference from Figure 1 is the shape of the inner support member 11. This embodiment is characterized in that the two inner support members 11, which were separated into upper and lower parts in Figure 2, are integrated by a central member.

[0074] This provides the same effect as in the second embodiment, and also has the advantage of increasing the strength of the inner support member 11 .

[0075] In addition to the manufacturing method disclosed in Example 2, this method is a method for manufacturing an amorphous transformer in which a support is disposed between the inner support members. Furthermore, this method is a method for manufacturing an amorphous transformer in which the support is integrally formed with the inner support members.

[0076] Figure 4 is a view corresponding to Figure 3. The difference from Figure 3 is that the two inner support members 11 are connected by a separate support member 12, instead of being integrated by a central member as in Figure 3.

[0077] This provides the same effect as in the third embodiment, and also has the advantage of facilitating fine adjustments such as adjustment of the pressure between the inner support members 11 .

[0078] Fig. 5 is a view corresponding to Fig. 2. The difference from Fig. 2 is that the outer support member 10 is also integrated over multiple sides. This not only achieves the effects of Example 2, but also makes it possible to enhance the shape retention performance of the amorphous iron core 1 by the outer support member 10.

[0079] In addition, corners, curved sections, and R sections, which tend to radiate heat to the outside, are insulated or maintained at their temperature by external support members with large thermal capacity, which improves the efficiency of high-frequency heating and further reduces the iron loss of the amorphous transformer.

[0080] When the outer support member and inner support member of the configuration shown in Figure 5 are used, the amorphous transformer has the characteristics that the number of regions where the iron loss is higher than other parts of the periphery is the same on the inner and outer circumferential sides, and the regions are located on the circumferential edges.

[0081] The manufacturing method can be expressed as follows, for example.

[0082] The method for manufacturing an amorphous transformer includes a step of applying high frequency to an amorphous core to anneal it, and in this step, an inner support member and an outer support member and a fastening jig that fastens the inner support member and the outer support member in an insulated state are used, and both the inner support member and the outer support member have non-forming areas, and the inner support member is formed integrally with multiple sides, and the outer support member and the inner support member are arranged including angular or corner portions.

[0083] This embodiment is an embodiment used incidentally to the first to fifth embodiments.

[0084] This embodiment is characterized in that the inner support member 11 in the first to fifth embodiments protrudes from the outer support member 10 as an outer shape of the amorphous transformer.

[0085] Although not shown, a structural feature of Figures 1 to 5 is that the inner support member 11 protrudes or is longer than the outer support member 10 in a direction projecting forward from the drawing, or in the Z direction if the drawing is in the XY direction.

[0086] In this case, when applying this embodiment, the amorphous core is preferably one in which amorphous thin films are laminated to have a lap portion, as disclosed as an example in Example 1. That is, for the purpose of smoothing the magnetic flux distribution inside the core, it is preferable that the amorphous core made by laminating amorphous thin films has a lap structure including overlap junctions and step lap junctions, with the distance between the ends of the lap portion being large inside the core and the distance between the lap ends being short toward the outer periphery. This is because the magnetic flux distribution inside the core can be further smoothed.

[0087] At this time, it is desirable that the inner support member 11 protrudes from the outer support member 10, and that the protruding portion serves as the above-mentioned lap portion.

[0088] Because the interlinkage magnetic flux is high in the wrap portion, the magnetic flux density is higher than the average magnetic flux density of the iron core. Furthermore, because the magnetic path length is short on the inner periphery of the amorphous iron core, the magnetic flux density is even higher. Therefore, because the magnetic flux is locally higher than the excitation magnetic flux density, the eddy current loss, which is proportional to the square of the magnetic flux density, also increases, and the temperature rises during high-frequency induction heating.

[0089] To level this out, the inner support member on the inner periphery of the wrap is protruded upwards to allow air to reach it, thereby improving the cooling effect of the wrap.

[0090] This can be expressed as a manufacturing method, for example, as follows.

[0091] The method for manufacturing an amorphous transformer includes a step of applying high frequency to an amorphous core to anneal it, and in this step, an inner support member, an outer support member, and a fastening jig that fastens the inner support member and the outer support member together in an insulated state are used, and both the inner support member and the outer support member have non-formed areas, and the inner support member is formed integrally with multiple sides, and the inner support member has an area that protrudes from the outer support member.

[0092] Furthermore, the method for manufacturing an amorphous transformer is such that the protruding region is provided in correspondence with the lap portion of the amorphous core.

[0093] This example is based on the disclosure of Example 6.

[0094] This embodiment is characterized in that when multiple amorphous iron cores are annealed simultaneously in one treatment chamber, the arrangement of the multiple amorphous iron cores in the treatment chamber is shifted so that the protruding positions of the protruding inner support members disclosed in Example 6 are different.

[0095] This makes it possible to avoid unevenness in environmental conditions, such as the way the wind hits each protruding inner support member, when processing multiple amorphous iron cores simultaneously in one processing chamber, thereby achieving the effect of suppressing manufacturing variations between individual pieces.

[0096] The present invention is not limited to the structures disclosed in the above-described embodiments, and as long as the technical concept disclosed in this specification is applied, modified examples are also included in the scope of the disclosure of the present invention.

[0097] The technical idea disclosed in the present invention can also be expressed as follows. <No. 1> An amorphous transformer in which the iron loss of an amorphous core constituting the amorphous transformer is greater in some parts than in other parts of the periphery, and the greater parts are smaller in area than the other parts. <No. 2> An amorphous transformer in accordance with <No. 1>, in which the iron loss of the amorphous core has a gradient between the inner and outer periphery. <No. 3> An amorphous transformer in accordance with <No. 2>, in which the areas where the iron loss is greater than in other parts of the periphery are present on both the inner and outer periphery. <No. 4> An amorphous transformer in accordance with <No. 3>, in which the number of areas where the iron loss is greater than in other parts of the periphery is greater on the outer periphery than on the inner periphery. <No. 5> An amorphous transformer according to <No. 4>, wherein the locations of the regions where the iron loss is higher than other parts of the periphery are located on different sides in the circumferential direction on the inner and outer periphery. <No. 6> An amorphous transformer according to <No. 5>, wherein the locations of the regions where the iron loss is higher than other parts of the periphery are located on sides on the inner periphery and in corners on the outer periphery. <No. 7> An amorphous transformer according to <No. 3>, wherein the number of regions where the iron loss is higher than other parts of the periphery is the same on the inner periphery and outer periphery, and are located on sides in the circumferential direction. <No. 8> A method for manufacturing an amorphous transformer, comprising a step of applying high frequency to an amorphous core to anneal it, wherein the step uses inner and outer support members and a fastening jig that fastens the inner and outer support members together in an insulated state, and wherein both the inner and outer support members have non-forming areas, and the inner support member is integrally formed on multiple sides. <No. 9> A method for manufacturing an amorphous transformer according to <No. 8>, wherein the outer support member is arranged in an area other than corners, and the inner support member is arranged including the corners. <No. 10> A method for manufacturing an amorphous transformer according to <No. 9>, wherein the amorphous transformer has a plurality of inner support members.<No. 11> A method for manufacturing an amorphous transformer according to <No. 10>, wherein there are multiple inner support members and support members are arranged between the inner support members. <No. 12> A method for manufacturing an amorphous transformer according to <No. 11>, wherein the support members are configured integrally with the inner support members. <No. 13> A method for manufacturing an amorphous transformer according to <No. 8>, wherein the outer support member and the inner support member are arranged including angular or corner portions. <No. 14> A method for manufacturing an amorphous transformer according to <No. 8>, wherein the inner support member has a region that protrudes from the outer support member. <No. 15> A method for manufacturing an amorphous transformer according to <No. 14>, wherein the inner support member has a region that protrudes from the outer support member. <No. 15> A method for manufacturing an amorphous transformer according to <No. 14>, wherein the protruding region is provided to correspond to a lap portion of the amorphous core.

[0098] 1: Amorphous iron core 10: Outer support member 11: Inner support member 12: Support member 15: Fastening bolt

Claims

1. In an amorphous transformer, the amorphous core constituting the amorphous transformer has a part with iron loss greater than that of other parts around it, and the area with the greater iron loss has a smaller range than the other parts.

2. The amorphous transformer according to claim 1, wherein the iron loss of the amorphous core has an inclination on the inner circumferential side and the outer circumferential side.

3. The amorphous transformer according to claim 2, wherein the areas with iron loss greater than those of other parts around are present on both the inner circumferential side and the outer circumferential side.

4. The amorphous transformer according to claim 3, wherein the number of areas with iron loss greater than those of other parts around is larger on the outer circumferential side than on the inner circumferential side.

5. The amorphous transformer according to claim 4, wherein the locations of the areas with iron loss greater than those of other parts around are on different sides on the inner circumferential side and the outer circumferential side in the circumferential direction.

6. The amorphous transformer according to claim 5, wherein the locations of the areas with iron loss greater than those of other parts around are at the side part on the inner circumferential side and at the corner part on the outer circumferential side.

7. The amorphous transformer according to claim 3, wherein the number of areas with iron loss greater than those of other parts around is the same on the inner circumferential side and the outer circumferential side, and is located at the side part in the circumferential direction.

8. In a method for manufacturing an amorphous transformer, the method includes a step of applying a high frequency to the amorphous core for annealing. In this step, an inner support member, an outer support member, and a fastening jig for fastening the inner support member and the outer support member in an insulated state are used. Both the inner support member and the outer support member have non-formed areas, and the inner support member is integrally formed with a plurality of sides.

9. The method for manufacturing an amorphous transformer according to claim 8, wherein the outer support member is arranged in an area other than the corner part or the corner region, and the inner support member is arranged including the corner part or the corner region.

10. The method for manufacturing an amorphous transformer according to claim 9, wherein there are a plurality of the inner support members.

11. The method for manufacturing an amorphous transformer according to claim 10, wherein there are a plurality of the inner support members, and a support body is arranged between the inner support members.

12. In the method for manufacturing an amorphous transformer according to claim 11, a method for manufacturing an amorphous transformer, wherein the support is integrally formed with the inner support member.

13. In the method for manufacturing an amorphous transformer according to claim 8, a method for manufacturing an amorphous transformer, wherein the outer support member and the inner support member are arranged including corners or corner portions.

14. In the method for manufacturing an amorphous transformer according to claim 8, a method for manufacturing an amorphous transformer, wherein the inner support member has a region protruding from the outer support member.

15. In the method for manufacturing an amorphous transformer according to claim 14, a method for manufacturing an amorphous transformer, wherein the protruding region is provided corresponding to the lap portion of the amorphous core.

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