Amorphous transformer and method for manufacturing the same

Abstract

To provide an amorphous transformer which has a low environmental load when being manufactured, and a method for manufacturing the amorphous transformer.SOLUTION: In the amorphous transformer, the amorphous iron core forming the amorphous transformer is more damaged in one part than in other parts and the region which is damaged more is smaller than the regions which are damaged less.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Amorphous transformers in which a large number of amorphous thin films are laminated on the core of a transformer are widely used because of their low power loss and excellent environmental compatibility.

[0003] In the manufacturing process thereof, annealing treatment for applying heat to the amorphous core is known for the purpose of improving magnetic properties.

[0004] Patent Document 1 discloses using a forming jig during annealing. Patent Document 2 also discloses a method of annealing by winding an exciting coil around an amorphous core and applying a high-frequency voltage to generate heat in the core.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] During annealing, Patent Document 1 discloses a method of putting the whole into an annealing furnace. However, in this method, it is necessary to raise the temperature of the entire annealing furnace, resulting in poor heat utilization efficiency during manufacturing and a manufacturing method with a high environmental load.

[0007] On the one hand, Patent Document 2 discloses a method of annealing by applying a high-frequency voltage by winding an exciting coil around a amorphous core, that is, so-called high-frequency heating. According to this method, only the object to be heated can be heated by high-frequency heating, that is, like a microwave oven, so annealing can be performed with a minimum amount of power. Therefore, it is a manufacturing method with a low environmental impact.

[0008] Here, Patent Document 1 discloses, in FIGS. 2 and paragraphs 0024 to 0025, using an inner peripheral forming metal fitting and an outer peripheral forming metal fitting, fastening the inner peripheral and outer peripheral forming metal fittings with bolts to clamp the core, and annealing together with the forming metal fittings. However, as the disclosed annealing method, there is no disclosure or suggestion of high-frequency heating.

[0009] On the other hand, Patent Document 2 discloses an annealing method by high-frequency heating, but there is no disclosure or suggestion regarding the forming metal fitting to be used at that time.

[0010] In view of such circumstances, the present invention provides a manufacturing method using an appropriate forming metal fitting during high-frequency heating in an amorphous transformer and its manufacturing method for annealing by high-frequency heating, and an amorphous transformer with a low manufacturing load realized thereby.

Means for Solving the Problems

[0011] As an example of the means for solving the above problems, it is as follows.

[0012] In an amorphous transformer, the amorphous core constituting the amorphous transformer is characterized in that a part of its iron loss is larger than other parts of the circumference, and the large region has a smaller range than the other parts.

Effects of the Invention

[0013] According to the present invention, it is possible to provide an amorphous transformer with a low environmental impact during manufacturing and its manufacturing method.

[0014] Further means and further effects of the present invention will become apparent throughout the following specification.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

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

Embodiment

[0017] An amorphous core can be made into a low-loss core because the loss of the amorphous ribbon is as low as 1 / 3 to 1 / 4 compared to a silicon steel sheet. As an example, a laminated structure of amorphous ribbons (with a thickness of around 0.025 mm) is suitable.

[0018] An amorphous core is formed by bundling and cutting a plurality of roll-shaped amorphous alloy ribbons wound around a loop, laminating the cut amorphous alloy ribbons in a U-shape on a rectangular core metal, and lap-joining the ends.

[0019] Thereafter, a magnetic field is applied in the longitudinal direction of the core, and high-frequency induction heating is performed on the amorphous core to heat-treat it in a high-temperature state of 300 to 400 °C. It is the same high-frequency heating as a microwave oven. By annealing in a magnetic field, the directions of the magnetic moments are aligned and the axes are fixed, so the magnetic properties are improved.

[0020] Patent Document 1 discloses annealing by an annealing furnace. As an example of a commonly used annealing furnace, heat is indirectly applied to the core by warm air from an electric furnace, the atmosphere inside the furnace is filled with an inert gas to prevent oxidation of the core, and heat is transferred by the inert gas.

[0021] The structure of the furnace consists of a heater section, a circulation fan section, and a cooling section. They are installed inside the furnace, and the gas whose temperature is adjusted in the heater section and the cooling section circulates inside the furnace by the circulation fan. The method of indirectly applying heat to the core by warm air from such an electric furnace requires a lot of time to reach predetermined heat treatment conditions. To meet the recent demand for reducing power consumption, it is required 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 heat generation of the core. However, the holding member of the core at that time is not touched.

[0023] Here, Patent Document 1 discloses, in FIGS. 2 and paragraphs 0024 to 0025, using an inner peripheral forming metal fitting and an outer peripheral forming metal fitting, fastening the inner peripheral and outer peripheral forming metal fittings with bolts to clamp the core, and annealing together with the forming metal fitting. However, as the disclosed annealing method, there is no disclosure or suggestion of high-frequency heating.

[0024] That is, regarding an appropriate forming metal fitting for annealing by a high-frequency voltage, in other words, high-frequency heating or high-frequency annealing, those skilled in the art have not made appropriate studies so far, and it has been found that there is a big hole missing in the practical application when applying high-frequency heating to the manufacture of amorphous cores.

[0025] The amorphous magnetic ribbon forming the amorphous core has the properties of being hard and brittle. Moreover, since, for example, hundreds of ribbons with a thickness of 25 μm are laminated to form it, sufficient mechanical strength and rigidity cannot be obtained and it is difficult to stand on its own. Therefore, when performing high-frequency heating or high-frequency annealing, consideration of an appropriate forming jig becomes a very important matter.

[0026] Figure 1 is an explanatory diagram regarding annealing of a transformer in one embodiment of the present invention. 1 is an amorphous core, 10 is an outer support member, 11 is an inner support member, and 15 is a fastening bolt. The outer support member 10 and the inner support member 11 are fastened with the fastening bolt 15. Note that the fastening bolt 15 ensures insulation by itself with a material having insulating properties or by a combination of a washer and a hole as a space around the bolt.

[0027] Then, the amorphous core, in other words, a large number of laminated amorphous thin films, is sandwiched and clamped between the outer support member 10 and the inner support member 11. In that state, annealing by a high-frequency voltage, in other words, high-frequency heating or high-frequency annealing, heats the amorphous core 1 by high-frequency heating and performs heat treatment at 300 to 400°C.

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

[0029] That is, the outer support member 10 is configured to be separated into four parts. Thereby, each is configured not to be electrically connected. In other words, it can be expressed 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 C, and the opening part of the C becomes the non-forming region. This too, in other words, can be expressed that there is a non-forming region in the circumferential direction.

[0031] Whether there is a non-formed region in the circumferential direction on the support member is not a problem in annealing by an annealing furnace as disclosed in Patent Document 1. This is because the entire annealing furnace has the same temperature atmosphere.

[0032] On the other hand, in heating by applying a high-frequency voltage as disclosed in Patent Document 2, special consideration is required for the shape of the support member. Otherwise, the high-frequency heating itself cannot be achieved.

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

[0034] <Condition 1> There is a non-formed region in the outer support member.

[0035] <Reason 1> During high-frequency heating, the high-frequency is introduced into the amorphous core 1 from the non-formed region of the outer support member. Therefore, if there is no non-formed region in the outer support member, the introduction of the high-frequency is impossible, and the high-frequency heating cannot be achieved in principle.

[0036] <Condition 2> There is a non-formed region in the inner support member.

[0037] <Reason 2> If there is no non-formed region in the inner support member, the current excited in the amorphous core 1 by the high-frequency forms a current loop in the inner support member, and almost no current flows through the amorphous core 1. As a result, the high-frequency heating cannot be achieved.

[0038] This is because both the outer support member and the inner support member are metals with a thickness of several millimeters to several centimeters, while the amorphous thin film forming the amorphous core has a thickness of several tens of micrometers, and the difference ranges from two to three digits.

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

[0040] <Reason 3> During heating in an annealing furnace, the temperature of the amorphous core 1 gradually rises uniformly throughout. On the other hand, during high-frequency heating, the temperature of the amorphous core 1 rises rapidly, and there is a difference in the rate of temperature rise between the inner and outer circumferences of the amorphous core 1. This is due to the fact that the length (circumference) of the amorphous thin film on the inner circumference is structurally shorter than the length (circumference) of the amorphous thin film on the outer circumference. For this reason, the length of the heating target on the inner circumference is shorter than that on the outer circumference, and as a result, even with the same high frequency, the temperature rises more rapidly on the inner circumference than on the outer circumference.

[0041] Therefore, it has been found in this study that high-frequency heating has the problem that the shape change on the inner circumference side is likely to occur. As a countermeasure, in practical use, it is necessary to integrally form the inner support member across a plurality of sides. This makes it possible to reliably support the shape, particularly at the corner portions.

[0042] When putting into practical use a manufacturing method for annealing the core of an amorphous transformer using high-frequency heating and an amorphous transformer created by that manufacturing method, the inventor has found that it is essential to simultaneously achieve the above conditions 1 to 3.

[0043] Therefore, this example and the subsequent examples will all describe a manufacturing method for an amorphous transformer that manufactures an amorphous transformer using a support member having a shape that can simultaneously achieve the above conditions 1 to 3, and will also describe the amorphous transformer manufactured thereby.

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

[0045] In a manufacturing method for an amorphous transformer that anneals an amorphous core by high-frequency induction heating, a jig for annealing is used during the annealing. The annealing jig has an outer support member with a non-formed region, an inner support member with a non-formed region, and a fastener that fastens while ensuring insulation between both the outer support member and the inner support member. The inner support member is integrally formed across a plurality of sides. A method for manufacturing an amorphous transformer characterized by this.

[0046] By applying this manufacturing method, annealing of an amorphous core by high-frequency induction heating can be put into practical use. For an amorphous transformer with low loss and low environmental load as a product, further reduction of the environmental load during manufacturing can also be achieved. Therefore, it becomes possible to provide a transformer with excellent environmental performance throughout its life cycle.

[0047] In the manufacturing process, whether high-frequency annealing was performed using the support member as described above can be confirmed in part by examining the iron loss of the completed amorphous core. That is, when using the outer support member and the inner support member as shown in Fig. 1, a subtle difference in iron loss will occur depending on the location. For example, in the case of an amorphous core, the non-formed region of the inner support member, that is, the part corresponding to the opening of the C shape, will have slightly higher iron loss than other regions.

[0048] This is because the part where there is a thick metal inner support member has a higher final annealing temperature during high-frequency annealing due to its heat capacity, so annealing progresses more.

[0049] Of course, if the annealing process is carried out for an extremely long time, such differences will disappear, but this will result in additional power consumption. Therefore, it is necessary to weigh both the increase in manufacturing power and the reduction of loss during use, find a balance, and optimize the manufacturing conditions to reduce the environmental load throughout the life cycle.

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

[0051] In an amorphous transformer, the amorphous core constituting the amorphous transformer is characterized in that part of its iron loss is greater than that of other parts around it, and the area with the greater iron loss has a smaller range than the other parts.

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

[0053] For the purpose of smoothing the magnetic flux distribution inside the core, the amorphous core formed by laminating amorphous thin films is desirably in a lap structure including an overlap joint and a step lap joint, increasing the distance at the end of the lap part inside the core and shortening the distance of the lap end toward the outer peripheral part. This is because the magnetic flux distribution inside the core can be made smoother.

[0054] Furthermore, as the inner support member 11 in this embodiment, more desirably, as disclosed in FIG. 1, the corner part has an R shape or has a curvature. This is because the shape retention during annealing of the amorphous core can be made more reliable.

[0055] Also, part of the shape features of FIG. 1 can be expressed as follows.

[0056] A configuration is adopted in which a loop that surrounds the amorphous core with metal cannot be formed, and a configuration that prevents circulating current is adopted. Also, the support member is provided with a non-formation region so as not to form a loop similar to the core, or has a shape excluding a part of the ring shape or a non-ring shape.

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

[0058] When annealing the iron core by induction heating with the application of a high-frequency voltage, the magnetic flux density on the inner peripheral side with a short magnetic path length tends to increase, while the magnetic flux density on the outer peripheral side with a long magnetic path length tends to decrease. As a result, the iron loss value also has a slope on the inner and outer circumferences, which is a characteristic of annealing with high-frequency excitation. Furthermore, due to the presence of a part where the iron core support member is not in contact with the iron core, a local temperature distribution is formed, and the iron loss value changes only in the part excluding the inner peripheral side annular shape.

[0059] Therefore, in the iron core using the technical idea disclosed in this embodiment, in addition to the inclination on the inner and outer circumferences, a partial iron loss change appears. Therefore, it can also be said that the transformer adopting this patent is a transformer provided with a wound iron core having a part where the magnetic characteristics of the inner peripheral part of the wound iron core are one or more lower in the circumferential direction.

[0060] Incidentally, as described above, the part corresponding to the mouth of the C shape has a slightly larger iron loss than other regions. This is because the place with the thick inner support member made of metal has a higher final annealing temperature during high-frequency annealing due to its heat capacity, so the annealing progresses more.

[0061] In an amorphous transformer annealed by high-frequency heating using the inner support member and the outer support member having the configuration shown in FIG. 1, the following situation will be shown.

[0062] That is, in an amorphous transformer, the amorphous iron core constituting the amorphous transformer is an amorphous transformer in which a part of its iron loss is larger than other parts of the circumference, and the region with the larger iron loss has a smaller range than the other parts.

[0063] Furthermore, it becomes an amorphous transformer in which the iron loss of the amorphous iron core has an inclination on the inner peripheral side and the outer peripheral side.

[0064] Furthermore, the region where the iron loss is larger than other parts of the circumference is an amorphous transformer existing on both the inner peripheral side and the outer peripheral side.

[0065] Furthermore, an amorphous transformer is obtained in which the location of the region where the iron loss is greater than other parts of the circumference is located on different sides on the inner circumferential side and the outer circumferential side in the circumferential direction.

[0066] Furthermore, an amorphous transformer is obtained in which the location of the region where the iron loss is greater than other parts of the circumference is located at the side part on the inner circumferential side and at the corner part on the outer circumferential side.

[0067] Also, as a manufacturing method, it can be expressed as follows.

[0068] A method for manufacturing an amorphous transformer includes a step of annealing by applying a high frequency to the amorphous core. In this step, an inner support member and 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 regions, and the inner support member is integrally formed with a plurality of sides. This is a method for manufacturing an amorphous transformer.

[0069] Furthermore, an outer support member is disposed in a region other than a corner or a corner portion, and the inner support member is disposed including a corner or a corner portion. This is a method for manufacturing an amorphous transformer.

Example

[0070] Figure 2 is a figure corresponding to Figure 1. The difference from Figure 1 lies in the shape of the inner support member 11. In Figure 1, it was an inverted C shape with a part on the left side in the figure being non-formed, but in Figure 2, there are two non-formed regions, and the C shapes are opposed to each other vertically.

[0071] With the shape of Figure 2, the effects described in Example 1 are achieved, and it has the advantage that the position and fastening force of the inner support member 11 can be adjusted more easily than the shape of Figure 1.

[0072] Also, when expressed as a manufacturing method, in the method for manufacturing an amorphous transformer disclosed in Example 1, the inner support member is plural. This is a method for manufacturing an amorphous transformer.

Example

[0073] Figure 3 is a figure corresponding to Figure 2. The difference from Figure 1 lies in the shape of the inner support member 11. In this embodiment, it is characterized in that the space between the two inner support members 11 that were divided vertically and horizontally in Figure 2 is integrated by a central member.

[0074] Thereby, while achieving the effects in Embodiment 2, there is an advantage that an increase in the strength of the inner support member 11 is realized.

[0075] Also, as a manufacturing method, in addition to the disclosure in Embodiment 2, it becomes a manufacturing method of an amorphous transformer in which a support is disposed between the inner support members. Furthermore, it becomes a manufacturing method of an amorphous transformer in which the support is integrally formed with the inner support member.

Embodiment

[0076] Figure 4 is a figure corresponding to Figure 3. The difference from Figure 3 is that instead of integrating the space between the two inner support members 11 with a central member as in Figure 3, they are connected by another support column member 12.

[0077] Thereby, while achieving the effects in Embodiment 3, there is an advantage that fine adjustments such as adjustment of the pressing between the inner support members 11 become easy.

Embodiment

[0078] Figure 5 is a figure corresponding to Figure 2. The difference from Figure 2 is that the outer support member 10 is also integrated over a plurality of sides. Thereby, while achieving the effects in Embodiment 2, enhancement of the shape retention performance of the amorphous core 1 by the outer support member 10 can be realized.

[0079] Also, since a corner portion, a curved portion, or an R portion that is easy to dissipate heat to the outside is heat-insulated or temperature-maintained by an outer support member with a large heat capacity, the efficiency of high-frequency heating is improved, and further reduction of the iron loss of the amorphous transformer is realized.

[0080] When using the outer support member and the inner support member configured as shown in FIG. 5, as a characteristic of the amorphous transformer, the number of regions where the iron loss is greater than that of other parts of the circumference is the same on the inner circumferential side and the outer circumferential side, and it becomes an amorphous transformer located at the side portion in the circumferential direction.

[0081] When expressed as a manufacturing method, for example, it is as follows.

[0082] A method for manufacturing an amorphous transformer, comprising a step of annealing by applying a high frequency to the amorphous core, in which 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, and both the inner support member and the outer support member have non-formed regions, the inner support member is integrally formed with a plurality of sides, and the outer support member and the inner support member are arranged including corner portions or corner parts.

Example

[0083] This example is an example that is additionally used with respect to Examples 1 to 5.

[0084] In this example, it is characterized in that the inner support member 11 in Examples 1 to 5 protrudes as the outer shape of the amorphous transformer more than the outer support member 10.

[0085] Although not shown in the drawings, in FIGS. 1 to 5, in the direction of protruding from the drawing to the front, or when the drawing is in the XY direction, the inner support member 11 protrudes or is longer than the outer support member 10 in the Z direction, which is a structural feature.

[0086] At this time, it is desirable that the amorphous core when applying this embodiment is formed by laminating amorphous thin films so as to have a lap portion, as disclosed as an example in Embodiment 1. That is, for the purpose of smoothing the magnetic flux distribution inside the core, the amorphous core formed by laminating amorphous thin films has a lap structure including an overlap joint and a step lap joint, and it is desirable to increase the distance between the ends of the lap portion inside the core and shorten the distance of the lap ends toward the outer peripheral portion. This is because the magnetic flux distribution inside the core can be made smoother.

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

[0088] Since the magnetic flux linkage is high in the lap portion, the magnetic flux density becomes higher than the average magnetic flux density of the core. Furthermore, since the magnetic path length is short on the inner peripheral side of the amorphous core, the magnetic flux density becomes higher more significantly. Therefore, since the magnetic flux becomes locally high with respect to the excitation magnetic flux density, the eddy current loss proportional to the square of the magnetic flux density also increases, and the temperature rises during high-frequency induction heating.

[0089] To equalize this, the inner support member on the inner peripheral side of the lap portion is made to protrude upward so that the wind hits it. Thereby, the cooling effect of the lap portion can be enhanced.

[0090] When expressing this as a manufacturing method, for example, it is as follows.

[0091] A method for manufacturing an amorphous transformer, comprising a step of annealing an amorphous core by applying a high frequency thereto, in which a fastening jig for fastening the inner support member and the outer support member in an insulated state is used, and both the inner support member and the outer support member have non-formed regions, the inner support member is integrally formed with a plurality of sides, and the inner support member has a region protruding from the outer support member.

[0092] Furthermore, the protruding region corresponds to the wrapped portion of the amorphous core, and it becomes a method for manufacturing an amorphous transformer.

Example

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

[0094] In this example, when annealing a plurality of amorphous cores simultaneously in one processing chamber, the arrangement of the plurality of amorphous cores in the processing chamber is shifted so that the protruding positions of the protruding inner support members disclosed in Example 6 are different.

[0095] As a result, when processing a plurality of amorphous cores simultaneously in one processing chamber, uneven environmental conditions such as the way the wind hits each protruding inner support member can be avoided, and thus the manufacturing variation between individuals can be suppressed.

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

[0097] Also, the technical idea disclosed in the present invention can be expressed as follows. <Part 1> In an amorphous transformer, the amorphous core constituting the amorphous transformer has a part with a larger iron loss than other parts around it, and the large region has a smaller range than the other parts, which is an amorphous transformer. <Part 2> In the amorphous transformer according to <Part 1>, the amorphous transformer in which the iron loss of the amorphous core has an inclination on the inner peripheral side and the outer peripheral side. <Part 3> In the amorphous transformer according to <Part 2>, the region where the iron loss is larger than other parts around it is present on both the inner peripheral side and the outer peripheral side, which is an amorphous transformer. <Part 4> In the amorphous transformer described in <The Third>, an amorphous transformer in which the number of regions where the iron loss is larger than other parts of the circumference is larger on the outer circumference side than on the inner circumference side. <The Fifth> In the amorphous transformer described in <The Fourth>, an amorphous transformer in which the location of the region where the iron loss is larger than other parts of the circumference is located on different sides on the inner circumference side and the outer circumference side in the circumferential direction. <The Sixth> In the amorphous transformer described in <The Fifth>, an amorphous transformer in which the location of the region where the iron loss is larger than other parts of the circumference is located at the side part on the inner circumference side and at the corner part on the outer circumference side. <The Seventh> In the amorphous transformer described in <The Third>, an amorphous transformer in which the number of regions where the iron loss is larger than other parts of the circumference is the same on the inner circumference side and the outer circumference side, and is located at the side part in the circumferential direction. <The Eighth> In a method for manufacturing an amorphous transformer, the method includes a step of annealing by applying a high frequency to an amorphous core, and 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, and both the inner support member and the outer support member have non-formed regions, and the inner support member is integrally formed with a plurality of sides. A method for manufacturing an amorphous transformer. <The Ninth> In the method for manufacturing an amorphous transformer described in <The Eighth>, the outer support member is arranged in a region other than a corner or a corner part, and the inner support member is arranged including a corner or a corner part. A method for manufacturing an amorphous transformer. <The Tenth> In the method for manufacturing an amorphous transformer described in <The Ninth>, the method for manufacturing an amorphous transformer in which there are a plurality of the inner support members. <The Eleventh> In the method for manufacturing an amorphous transformer described in <The Tenth>, there are a plurality of the inner support members, and a support is arranged between the inner support members. A method for manufacturing an amorphous transformer. <The Twelfth> In the method for manufacturing an amorphous transformer described in <The 11th>, the method for manufacturing an amorphous transformer in which the support is integrally formed with the inner support member. <The 13th> In the method for manufacturing an amorphous transformer described in <The 8th>, the method for manufacturing an amorphous transformer in which the outer support member and the inner support member are arranged including corners or corner portions. <The 14th> In the method for manufacturing an amorphous transformer described in <The 8th>, the method for manufacturing an amorphous transformer in which the inner support member has a region protruding from the outer support member. <The 15th> In the method for manufacturing an amorphous transformer described in <The 14th>, the method for manufacturing an amorphous transformer in which the protruding region is provided corresponding to the lap portion of the amorphous core.

Explanation of Signs

[0098] 1: Amorphous 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 large region 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 peripheral side and the outer peripheral side.

3. The amorphous transformer according to Claim 2, wherein the regions where the iron loss is greater than that of other parts around are on both the inner peripheral side and the outer peripheral side.

4. The amorphous transformer according to Claim 3, wherein the number of regions where the iron loss is greater than that of other parts around is more on the outer peripheral side than on the inner peripheral side.

5. The amorphous transformer according to Claim 4, wherein the locations of the regions where the iron loss is greater than that of other parts around are on different sides in the circumferential direction on the inner peripheral side and the outer peripheral side.

6. The amorphous transformer according to Claim 5, wherein the locations of the regions where the iron loss is greater than that of other parts around are at the side portions on the inner peripheral side and at the corner portions on the outer peripheral side.

7. The amorphous transformer according to Claim 3, wherein the number of regions where the iron loss is greater than that of other parts around is the same on the inner peripheral side and the outer peripheral side, and is located at the side portions 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. The inner support member and the outer support member both have non-formed regions, 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 a region other than the corner portions or the corner regions, and the inner support member is arranged including the corner portions or the corner regions.

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 in which 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 in which 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 in which 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 in which the protruding region is provided corresponding to the lap portion of the amorphous core.

Images