Static induction circuit

Abstract

To provide a stationary induction electric appliance comprising an iron core composed of an inner iron core composed of a wound amorphous magnetic ribbon and an outer iron core that surrounds the circumference of the inner iron core and consists of a silicon sheet, where characteristic deterioration or destruction of the amorphous ribbon is prevented from being caused by attachment of fastening fittings.SOLUTION: A stationary induction electric appliance comprises: an iron core composed of an inner iron core 2 composed of a wound amorphous magnetic ribbon and an outer iron core 1a that surrounds the circumference of the inner iron core 2 and consists of a silicon sheet; a coil 3 arranged at a leg of the iron core; and fastening fittings 5, 6 that fasten and hold the iron core from both sides of the iron core. The inner iron core 2's width W1 is smaller than the outer iron core 1a's width W2. A gap exists between an end of the inner iron core 2 and the fastening fittings 5, 6.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to static induction devices such as transformers and reactors, and in particular to a suitable structure for static induction devices using amorphous magnetic ribbons. [Background technology]

[0002] Amorphous iron core transformers, which use amorphous magnetic ribbons with low iron loss and excellent magnetic properties, are known as energy-saving transformers. Amorphous magnetic ribbons are produced by melting an alloy whose main component is iron (Fe), dripping it onto a rotating casting roll, and then rapidly cooling it. Amorphous magnetic ribbons have properties such as low hysteresis loss due to the lack of a crystalline structure, and low eddy current loss due to their thin plate thickness and high electrical resistivity, and are characterized by low iron loss compared to grain-oriented electrical steel sheets. On the other hand, amorphous magnetic ribbons are also characterized by being hard and brittle.

[0003] As amorphous core transformers become larger and higher voltage, there are hopes for improved reliability through measures such as increasing the core's independence as the transformer becomes larger, making the entire transformer portable, and reusing the foundation base when replacing existing transformers.However, due to the mechanical strength and dimensional constraints of the amorphous core, there are risks associated with increasing the size.

[0004] As a prior art amorphous core transformer, Patent Document 1 (JP Patent Publication No. 8-88128A) discloses "a multi-phase transformer core characterized by comprising an inner core made of iron cores wound with amorphous magnetic ribbons arranged in parallel and closely contacting each other, and an outer core that surrounds the outer periphery of the inner core and has at least a silicon steel plate wound or laminated on the outermost periphery" (see claim 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-88128 Summary of the Invention [Problem to be solved by the invention]

[0006] Patent Document 1 discloses a multiphase transformer core comprising an inner core made of iron cores wound with amorphous magnetic ribbons arranged in parallel and closely packed together, and an outer core that surrounds the outer periphery of the inner core and has at least a silicon steel plate wound or laminated around the outermost periphery. By providing an outer core with a silicon steel plate wound or laminated around the outermost periphery, it is possible to protect the inner core wound with amorphous magnetic ribbons, which are excellent at reducing iron loss, and ensure mechanical strength and rigidity.

[0007] In transformer cores, lower and upper fasteners are generally attached to the lower and upper parts of the core to clamp and hold the core in place. However, when fasteners are attached to an amorphous core, force is applied to the amorphous ribbon, which can deteriorate the properties of the amorphous core and can also cause damage to the hard and brittle amorphous ribbon.

[0008] The polyphase transformer core described in Patent Document 1 does not take into consideration the deterioration of characteristics or damage to the amorphous core due to the attachment of fasteners.

[0009] The present invention aims to prevent deterioration of the properties of, or damage to, an amorphous magnetic ribbon caused by attaching fasteners to the core in a static induction electric device having an iron core composed of an inner core wound with an amorphous magnetic ribbon and an outer core made of silicon steel plate that surrounds the outer periphery of the inner core. [Means for solving the problem]

[0010] To achieve the above object, one example of the "static induction electric appliance" of the present invention is as follows: A static induction machine comprising an iron core including an inner core wound with an amorphous magnetic ribbon and an outer core made of a silicon steel plate surrounding the outer periphery of the inner core, a coil disposed on the legs of the iron core, and fasteners for fastening and holding the iron core from both sides, The width of the inner core is narrower than the width of the outer core, and there is a gap between the end of the inner core and the fastener. [Effects of the Invention]

[0011] According to the present invention, the width of the inner core wound with the amorphous magnetic ribbon is made narrower than the width of the outer core made of silicon steel plate that surrounds the outer periphery of the inner core, and a gap is provided between the end of the inner core and the fasteners, thereby preventing deterioration in the properties of the amorphous ribbon and damage caused by attaching the fasteners to the core.

[0012] Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram showing a conventional three-phase, three-limbed transformer core that is composed of an inner core wound with an amorphous magnetic ribbon and an outer core wound with a silicon steel plate that surrounds the outer periphery of the inner core. [Figure 2] 2 is a diagram showing a state in which a fastener is attached to the transformer core of FIG. 1. FIG. [Figure 3] 1 is a diagram showing a three-phase three-limbed transformer core according to a first embodiment of the present invention, which is composed of an inner core wound with an amorphous magnetic ribbon and an outer core wound with a silicon steel plate surrounding the outer periphery of the inner core. [Figure 4] 4 is a diagram showing a state in which a fastener is attached to the transformer core of FIG. 3. FIG. [Figure 5] FIG. 10 is a diagram showing a three-phase, three-limbed transformer core according to a second embodiment of the present invention, which is composed of an inner core wound with an amorphous magnetic ribbon and an outer core formed by laminating silicon steel plates and surrounding the outer periphery of the inner core. [Figure 6] 6 is a diagram showing a state in which a fastener is attached to the transformer core of FIG. 5. FIG. [Figure 7] FIG. 10 is a diagram showing a single-phase transformer core according to a third embodiment of the present invention, which is composed of an inner core wound with an amorphous magnetic ribbon and an outer core wound with a silicon steel plate surrounding the outer periphery of the inner core. [Figure 8]8 is a diagram showing a state in which a fastener is attached to the transformer core of FIG. 7. FIG. [Figure 9] FIG. 10 is a partial perspective view of a transformer core according to a fourth embodiment of the present invention, in which a grounding member is attached to an inner core around which an amorphous magnetic ribbon is wound. [Figure 10] FIG. 10 is a partial cross-sectional view of a transformer core according to a fourth embodiment of the present invention, in which a grounding member is attached to an inner core wound with an amorphous magnetic ribbon. DETAILED DESCRIPTION OF THE INVENTION

[0014] Before describing the embodiments of the present invention, a conventional transformer having an amorphous core wound with an amorphous magnetic ribbon will be described.

[0015] Figure 1 shows the transformer core described in Patent Document 1. Figure 1(a) is a front view of the transformer core, Figure 1(b) is a side view thereof, and Figure 1(c) is a top view thereof. The transformer core in Figure 1 is a three-phase, three-limbed transformer core.

[0016] Two wound cores, each made of amorphous magnetic ribbon wound in a roughly rectangular shape, are arranged in parallel and tightly packed together to form inner core 2. Then, outer core 1a is formed by winding a silicon steel plate in a roughly rectangular shape around the outer periphery of inner core 2, and a transformer core is formed consisting of inner core 2 and outer core 1a. In the figure, the width of inner core 2 and the width of outer core 1a are both W, and are the same width.

[0017] In the transformer core shown in Figure 1, the silicon steel plate arranged on the outer periphery not only constitutes the core itself, but also covers the outer surface of the entire core, protecting the amorphous wound core, which is excellent at reducing iron loss, and ensuring mechanical strength and rigidity. This results in a transformer core with excellent iron loss characteristics and which is effective in facilitating assembly work.

[0018] Generally, in a transformer core, lower and upper fasteners are attached to the lower and upper parts of the core to clamp and hold the core from both sides. Figure 2 shows an example of fasteners attached to the transformer core of Figure 1. Figure 2(a) is a front view, Figure 2(b) is a side view, and Figure 2(c) is a top view.

[0019] An upper fastener 5 is attached to the top of the transformer core, which is made up of inner core 2 and outer core 1a, and a lower fastener 6 is attached to the bottom. The fasteners 5 and 6 in the figure consist of a pair of U-shaped metal fittings, which are placed on both sides of the transformer core and connected with mounting bolts 7, thereby tightening and holding the core from both sides. However, when fasteners 5 and 6 are attached to the amorphous core shown in Figure 1, force is applied to inner core 2, which is made of amorphous ribbon, degrading the properties of the amorphous core and posing the risk of damaging the hard and brittle amorphous ribbon.

[0020] The present invention provides a static induction motor having an iron core composed of an inner core wound with an amorphous magnetic ribbon and an outer core made of silicon steel plate surrounding the outer periphery of the inner core, in which deterioration of the properties and damage to the amorphous ribbon due to the attachment of fasteners are prevented.

[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention should not be construed as being limited to the description of the embodiments shown below. Those skilled in the art will readily understand that the specific configuration can be modified within the scope of the concept and gist of the present invention. In the drawings for explaining the embodiments, the same components are given the same names and symbols, and repeated explanations thereof may be omitted. Furthermore, in order to facilitate understanding of the invention, the position, size, shape, etc. of each component shown in the drawings may not represent the actual position, size, shape, etc. Therefore, the present invention is not necessarily limited to the position, size, shape, etc. disclosed in the drawings, etc. [Example]

[0022] Figure 3 shows a transformer core according to a first embodiment of the present invention. Figure 3(a) is a front view of the transformer core, Figure 3(b) is a side view thereof, and Figure 3(c) is a top view thereof. The transformer core in Figure 3 is a three-phase, three-limbed transformer core.

[0023] Two wound cores, each made of amorphous magnetic ribbon wound in a roughly rectangular shape, are arranged in parallel and tightly packed together to form the inner core 2. Then, a silicon steel plate is wound in a roughly rectangular shape around the outer periphery of the inner core 2 to form the outer core 1a. The inner core 2 and the outer core 1a form a transformer core. As shown in Figures 3(b) and 3(c), the width W1 of the inner core 2 is narrower than the width W2 of the outer core 1a.

[0024] Figure 4 shows an example of fasteners attached to the transformer core of Figure 3. Figure 4(a) is a front view, Figure 4(b) is a side view, and Figure 4(c) is a top view.

[0025] A coil (winding) 3 is placed on each of the three legs of the transformer core. An upper fastener 5 is attached to the top of the transformer core, which is made up of an inner core 2 and an outer core 1a, and a lower fastener 6 is attached to the bottom. The fasteners shown in the figure consist of a pair of metal fittings with a U-shaped cross section, and by placing the U-shaped fittings on both sides of the transformer core and connecting them with mounting bolts 7, the core is tightened and held from both sides. Note that fasteners 5 and 6 are not limited to the shapes shown in the figure, as long as they are capable of tightening and holding the core.

[0026] In the transformer core of this embodiment, the width W1 of the inner core 2 wound with an amorphous magnetic ribbon is narrower than the width W2 of the outer core 1a wound with a silicon steel plate that surrounds the outer periphery of the inner core 2, and a gap is provided between the end of the inner core 2 and the fasteners 5, 6. Therefore, even when fasteners are placed on both sides of the transformer core and tightened, no force is applied to the inner core wound with the amorphous magnetic ribbon, preventing deterioration of the properties or damage to the amorphous ribbon due to the attachment of fasteners. Furthermore, since the silicon steel plate is thicker and stronger than the amorphous magnetic ribbon, the attachment of fasteners does not cause deterioration of the properties or damage. [Example]

[0027] Figure 5 shows a transformer core according to a second embodiment of the present invention. Figure 5(a) is a front view of the transformer core, Figure 5(b) is a side view thereof, and Figure 5(c) is a top view thereof. The transformer core in Figure 5 is a three-phase, three-limbed transformer core. In the second embodiment, a stacked core made of silicon steel sheets is used as the outer core.

[0028] Two wound cores, each made of amorphous magnetic ribbon wound in a roughly rectangular shape, are closely arranged in parallel to form the inner core 2. An outer core 1b, roughly rectangular (frame-shaped), is then arranged to surround the outer periphery of the inner core 2. The outer core 1b is formed by combining rectangular partial cores made of laminated silicon steel plates in a roughly rectangular (frame-shaped) configuration. The lamination direction of the silicon steel plates is perpendicular to the plane of the paper in Figure 5(a), i.e., the width direction of the outer core and inner core. By laminating the silicon steel plates in the width direction of the outer core and inner core, the number of laminated silicon steel plates can be changed, and the width of the outer core can be easily changed. The inner core 2 and outer core 1b then form a transformer core. As shown in Figures 5(b) and 5(c), the width W1 of the inner core is narrower than the width W2 of the outer core.

[0029] Figure 6 shows an example of fasteners attached to the transformer core of Figure 5. Figure 6(a) is a front view, Figure 6(b) is a side view, and Figure 6(c) is a top view.

[0030] A coil (winding) 3 is placed on each of the three legs of the transformer core. An upper fastener 5 is attached to the top of the transformer core, which is made up of an inner core 2 and an outer core 1b, and a lower fastener 6 is attached to the bottom. The fasteners 5 and 6 shown in the figure consist of a pair of metal fittings with a U-shaped cross section, and are placed on both sides of the transformer core and connected with mounting bolts 7 to fasten and hold the core from both sides. Note that the fasteners 5 and 6 are not limited to the shapes shown in the figure, as long as they are capable of fastening and holding the core.

[0031] In the transformer core of this embodiment, the width W1 of the inner core wound with an amorphous magnetic ribbon is narrower than the width W2 of the outer core 1b, which is made of laminated silicon steel plates and surrounds the outer periphery of the inner core, and a gap is provided between the end of the inner core 2 and the fasteners 5, 6. Therefore, even when fasteners 5, 6 are placed on both sides of the transformer core and tightened, no force is applied to the inner core 2 wound with the amorphous magnetic ribbon, preventing deterioration of the properties of the amorphous ribbon or damage caused by the attachment of fasteners. Furthermore, since the silicon steel plates are thicker and stronger than the amorphous magnetic ribbon, they will not be damaged even when fasteners are attached. [Example]

[0032] Figure 7 shows a transformer core according to a third embodiment of the present invention. Figure 7(a) is a front view of the transformer core, Figure 7(b) is a side view thereof, and Figure 7(c) is a top view thereof. The transformer core in Figure 7 is a single-phase transformer core.

[0033] The inner core 2 is made up of a single wound core formed by winding an amorphous magnetic ribbon in a roughly rectangular shape. The roughly rectangular outer core 1a is then arranged to surround the outer periphery of the inner core 2. The outer core 1a is made up of a silicon steel plate wound in a roughly rectangular shape. As shown in Figures 7(b) and 7(c), the width W1 of the inner core is narrower than the width W2 of the outer core.

[0034] Figure 8 shows an example of fasteners attached to the transformer core of Figure 7. Figure 7(a) is a front view, Figure 7(b) is a side view, and Figure 7(c) is a top view.

[0035] A coil (winding) 3 is placed on each of the two legs of the transformer core. An upper fastener 5 is attached to the top of the transformer core, which is made up of an inner core 2 and an outer core 1a, and a lower fastener 6 is attached to the bottom. The fasteners 5 and 6 in the figure consist of a pair of U-shaped metal fittings, which are placed on both sides of the transformer core and connected with mounting bolts 7, thereby tightening and holding the core from both sides.

[0036] In the single-phase transformer core of this embodiment, the width W1 of the inner core wound with an amorphous magnetic ribbon is narrower than the width W2 of the outer core 1a wound with silicon steel plate and surrounding the outer periphery of the inner core, and a gap is provided between the end of the inner core 2 and the fasteners 5, 6. Therefore, even when the fasteners 5, 6 are arranged on both sides of the transformer core and fastened, no force is applied to the inner core 2 wound with the amorphous magnetic ribbon, and deterioration of the properties of the amorphous ribbon or damage due to the attachment of the fasteners can be prevented.

[0037] Although the outer core 1a of this embodiment is configured as a wound core in which silicon steel plates are wound, it may also be configured as a stacked core in which silicon steel plates are laminated, as in the second embodiment. [Example]

[0038] Fig. 9 shows a partial perspective view of a transformer core according to a fourth embodiment of the present invention. Fig. 10 shows a partial cross-sectional view of the transformer core taken along the arrow AA' in Fig. 9. Fig. 10 shows a portion of a side view of the transformer core shown in Fig. 3(b), for example.

[0039] Because amorphous magnetic ribbons have high electrical resistivity, it is difficult for the charged charge to be discharged. Therefore, it is necessary to ground the charged charge and allow it to flow. In this embodiment, as shown in the cross-sectional view of Figure 10, a grounding member 10 is placed between the amorphous ribbons that make up the inner core 2. The grounding member 10 may be made of a conductive plate or wire. The grounding member 10 is then placed in the gap 9 between the end of the inner core 2 and the fastener, and ground wiring is performed.

[0040] In this embodiment, the grounding members 10 are arranged between the amorphous ribbons that make up the inner core 2, and are wired in the gaps 9 between the ends of the inner core 2 and the fasteners 5, 6. This makes it easy to wire the grounding members 10, and makes it easy to prevent the inner core 2 around which the amorphous ribbons are wound from becoming charged.

[0041] Although the above embodiments have been described using a transformer as an example, the present invention can be applied to a static induction device including a reactor.

[0042] Furthermore, the present invention is not limited to the above-described embodiments and includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with other configurations. [Explanation of symbols]

[0043] 1a...Outer core made of silicon steel sheet wound core 1b...Outer core made of silicon steel sheet laminated core 2...Inner core made of amorphous wound core 3...Coil (winding) 5...Upper fastener 6...Lower fastener 7...Mounting bolt 9...Gap 10...Grounding member W1: Width of inner core W2: Width of outer core W': Gap width

Claims

1. an iron core including an inner core wound with an amorphous magnetic ribbon and an outer core made of a silicon steel plate surrounding the outer periphery of the inner core; a coil disposed on a leg of the iron core; fasteners for fastening and holding the iron core from both sides of the iron core; A static induction electric device comprising: The width of the inner core is narrower than the width of the outer core, and there is a gap between the end of the inner core and the fastener.

2. The static induction electric appliance according to claim 1, The outer core is a wound core made of silicon steel sheet.

3. The static induction electric appliance according to claim 1, The outer core is a stacked core made of laminated silicon steel plates.

4. The static induction device according to claim 3, The outer core is a stacked core in which rectangular silicon steel plates are stacked in the width direction of the inner core.

5. The static induction electric appliance according to claim 1, The inner core is a static induction motor in which two wound cores each made of an amorphous magnetic ribbon are arranged in parallel and in close contact with each other.

6. The static induction electric appliance according to claim 1, The static induction motor has an inner core made of a single wound core wound with an amorphous magnetic ribbon.

7. The static induction electric appliance according to claim 1, The static induction transformer is a three-phase three-leg transformer.

8. The static induction electric appliance according to claim 1, The static induction device is a single-phase transformer.

9. The static induction electric appliance according to claim 1, The static induction device is a reactor.

10. The static induction electric appliance according to claim 1, A static induction electric device in which a grounding member is disposed between the amorphous ribbons constituting the inner core, and the grounding member is wired in the gap between the end of the inner core and the fastener.

11. The static induction electric appliance according to claim 10, The grounding member is a static induction device made of a conductive plate or wire.

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