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WO2012073565A1 - Dispositif réacteur utilisant un matériau amorphe et son procédé de fabrication - Google Patents

Dispositif réacteur utilisant un matériau amorphe et son procédé de fabrication Download PDF

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Publication number
WO2012073565A1
WO2012073565A1 PCT/JP2011/069556 JP2011069556W WO2012073565A1 WO 2012073565 A1 WO2012073565 A1 WO 2012073565A1 JP 2011069556 W JP2011069556 W JP 2011069556W WO 2012073565 A1 WO2012073565 A1 WO 2012073565A1
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WIPO (PCT)
Prior art keywords
amorphous
reactor device
iron core
reactor
amorphous material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/069556
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English (en)
Japanese (ja)
Inventor
賢治 中ノ上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Industrial Equipment Systems Co Ltd
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Hitachi Industrial Equipment Systems Co Ltd
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Filing date
Publication date
Application filed by Hitachi Industrial Equipment Systems Co Ltd filed Critical Hitachi Industrial Equipment Systems Co Ltd
Publication of WO2012073565A1 publication Critical patent/WO2012073565A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
    • H01F41/0226—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) from amorphous ribbons

Definitions

  • the present invention relates to a reactor device using an amorphous material (amorphous material) and a method for manufacturing the reactor, and in particular, a plurality of laminated amorphous materials (amorphous materials) obtained by laminating a plurality of amorphous ribbon materials cut to a predetermined length.
  • the present invention relates to a reactor device in which stacked core units are abutted at a plurality of unit abutting joints, and a manufacturing method thereof.
  • Prior art related to the present invention which is described in the patent document, for example, relates to a reactor made of a magnetic ribbon, but is described in Japanese Patent Laid-Open No. 2006-1000051 (Patent Document 1).
  • Patent Document 1 There is technology.
  • An invention is disclosed in which an object of the present invention is to significantly reduce eddy current loss due to leakage magnetic flux, and to provide a reactor using a low-cost core that can be easily manufactured with less man-hours. This is because, in a reactor consisting of a yoke core made of a wound core formed by winding a magnetic ribbon, a leg core made of a laminated core punched and laminated with a magnetic ribbon, and a coil, the laminated surface of the leg iron core is the joint.
  • the present invention relates to a reactor characterized by having an arrangement perpendicular to the laminated surface of the iron core.
  • Patent Document 2 discloses an invention for the purpose of supplying a reset current to a magnetic switch with high inductance and reducing the size of the device.
  • the DC power supply for initial state setting that DC magnetizes the magnetic circuit of the magnetic switch in one direction by supplying a DC current from the DC power supply to the reset winding of the magnetic switch that becomes a saturable reactor or a saturable transformer.
  • Both ends of the pair of amorphous cut cores are supported by a support plate so that there is a gap, and a coil is applied from above to form a DC reactor, and this DC reactor is inserted between the DC power supply and the reset coil to provide a magnetic switch.
  • the leakage current from the power supply to the DC power supply is suppressed with high inductance.
  • a reset current is supplied without causing magnetic saturation, and miniaturization is achieved by using an amorphous core.
  • Patent Document 3 discloses a method of manufacturing a static induction electric device using a wound iron core made of an amorphous magnetic alloy ribbon, and the amorphous magnetic alloy thin film is disclosed. A step of forming a wound body by winding a band, cutting two portions of the wound body and developing the laminated body, and laminating the amorphous magnetic alloy thin ribbon with one end aligned.
  • a step of dividing the two sets of laminated blocks formed in this step into a plurality of unit blocks, each having a plurality of units, and two U-shaped winding frame structures, one winding frame structure The unit blocks of the one laminated block are alternately laminated in the length direction to form a U-shape, and the other laminated block is alternately arranged in the length direction on the other winding frame structure.
  • Laminate by changing the direction and form into a U shape, and this process Annealing the two sets of laminated blocks having a U-shape and inserting the two sets of the laminated blocks having a U-shape into the windings to butt each end.
  • Patent Document 4 Japanese Patent Laid-Open No. 62-265711 also discloses that a first iron core is manufactured by cutting an amorphous magnetic alloy strip at one location after winding and then forming it into a U shape. After winding the crystalline magnetic alloy strip to a diameter smaller than the winding diameter when the first iron core is manufactured, it is cut at one place and then formed into a linear shape to form the second iron core, Disclosed is a method for manufacturing a transformer, wherein a wound core is formed by joining a joint surface at both ends of the first iron core and a joint surface at both ends of the second iron core after inserting a coil into the iron core. Yes.
  • Patent Document 5 discloses a laminated block in which a large number of amorphous magnetic alloy ribbons are laminated to form a U shape, and an end surface forms an inclined surface.
  • a wound iron core formed by laminating amorphous magnetic alloy ribbons to form a U-shaped laminated block whose end face is an inclined surface that forms a pair with the end face of the laminated block, but by combining the end faces with each other; And a coil mounted on the wound iron core.
  • This patent document 5 describes in the specification that “first, as shown in FIG. 3, the amorphous magnetic alloy ribbon 13 is wound, and a part of this wound body is cut along the AA line to obtain a length. It is premised that a cut core is formed by cutting a wound iron core as described in “Responsible relative 18 formed by laminating a large number of amorphous magnetic alloy ribbons 13 that gradually increase”.
  • Patent Document 6 JP-A-61-180411 (Patent Document 6), a large number of amorphous magnetic alloy ribbons forming each turn of a wound iron core are laminated with their positions shifted in the length direction. Forming a laminated block in which an end face of the end portion forms an inclined surface, and fixing the end portion having the inclined end face, bending the laminated block along a length direction, and inclining the other end portion of the laminated block The manufacturing method of the wound core structure characterized by comprising the process made into a surface is disclosed.
  • This Patent Document 6 is also a technique based on a cut core obtained by cutting a wound iron core.
  • Patent Document 7 discloses a method for manufacturing a cut core by combining two unit cut cores having a U-shape, wherein the unit cut core includes a plurality of amorphous magnetic cores.
  • a step of cutting the alloy ribbons to a predetermined length, and aligning the cut end faces of the amorphous magnetic alloy ribbons with a magnet and aligning the amorphous magnetic alloy ribbons along the cored bar Bending into a U-shape and fixing to the metal core, a process of annealing in a magnetic field with the amorphous magnetic alloy ribbon group fixed to the metal core, and the amorphous magnetic alloy after annealing.
  • a method for producing a cut core comprising: a step of winding a tape around the amorphous magnetic alloy ribbon group in a state where the ribbon group is removed from the core metal and the cut end face is attracted and fixed to a magnet. It is disclosed.
  • JP 2006-1000051 A JP-A-6-292326 JP-A-62-92307 JP-A-62-265711 JP 61-180408 A JP 61-180411 A JP 60-86813 A
  • an iron core such as a cut core and a core with a gap is once formed and solidified with a resin, and then a cross section is cut.
  • This cutting method has been conventionally performed by cutting with a diamond cutter or a grindstone, and in order to fix the iron core, the iron core is hardened with a resin in order to prevent the iron core from being rusted by cooling water.
  • This operation is not a problem if the reactor has a small capacity including cutting, but the difficulty and the processing cost increase as the size increases.
  • the inventor of the present application tried water jet processing, wire cut processing, and laser processing as cutting methods of the iron core, but none of them was suitable for cutting an amorphous iron core having a large cross section.
  • the gap part of an iron core is an important part for the reactor characteristic of adjusting the magnetic characteristic by increase in iron loss by fringing and adjusting the gap width for the reactor.
  • the conventional cutting method has a problem that the degree of freedom in the shape of the gap portion is low, so that an optimum structure cannot be obtained.
  • the amorphous material itself is also a material that is vulnerable to processing stress, and iron loss is greatly deteriorated by processing such as fixing and cutting of the iron core with a resin or the like. Since the iron core is hardened with a resin and then cut, it is impossible to remove stress applied during cutting.
  • Patent Document 7 Japanese Patent Laid-Open No. 60-868173 discloses a technique for obtaining a cut core by cutting a large number of amorphous magnetic alloy ribbons into predetermined lengths. Yes.
  • the cut amorphous magnetic alloy ribbons are formed by laminating the cut amorphous magnetic alloy ribbons, and then one of the cut ends is placed on the smooth attracting surface of the electromagnet.
  • the amorphous magnetic alloy ribbon group is bent along the outer peripheral surface of the cored bar.
  • a large number of laminated amorphous magnetic alloy ribbons are forced to have a large relative movement (sliding), and in some cases there is a risk of cracking.
  • the reactor device using the amorphous material of the present invention has a structure in which a wound iron core unit in which a plurality of laminated amorphous materials obtained by laminating a plurality of amorphous strips cut to a predetermined length are butted together at a plurality of unit butt joints. It is characterized by being divided or more.
  • the reactor device using the amorphous material of the present invention is characterized in that butt joining is performed at the corner of the iron core unit.
  • the reactor device using the amorphous material according to the present invention is characterized in that a plurality of wound core units are butt-joined via a gap member in the butt-joining portion.
  • the reactor device using the amorphous material of the present invention is characterized in that each of the wound core units is retained by a shape retaining member.
  • the reactor device using the amorphous material of the present invention is characterized in that the center portion of the butt joint portion of the wound core unit is convex and the butt area is small.
  • a method for manufacturing a reactor apparatus using an amorphous material according to the present invention includes a step of cutting a thin amorphous ribbon material into a predetermined length and laminating a predetermined number of layers, and stacking the laminated amorphous material in a plurality of stages to form a wound core unit. It is characterized in that a plurality of units are prepared and molded and then annealed and assembled as a unit.
  • the manufacturing method of the reactor apparatus using the amorphous material according to the present invention is to cut the amorphous ribbon material into a predetermined length and laminate a predetermined number of layers, and stack the laminated amorphous material in a plurality of stages to constitute a wound core unit. The center portion of each of the laminated amorphous materials is stacked together.
  • a large capacity reactor using an amorphous material can be manufactured by the reactor device of the novel configuration of the present invention. More specifically, according to the manufacturing method of the present invention, since the wound core unit is not first assembled and then cut, the core having a large cross section and a large capacity reactor can be manufactured.
  • the reactor device of the present invention it is not necessary to harden the wound core unit with resin for cutting, and no stress due to cutting is applied, so that deterioration of iron loss can be suppressed. Moreover, the freedom degree at the time of iron core shaping
  • molding can be raised, and the reactor apparatus using a large sized amorphous material and a highly efficient reactor apparatus can be manufactured.
  • the structure figure of the reactor apparatus of this invention is shown.
  • the schematic image figure of the whole process of the manufacturing method of the reactor apparatus of this invention is shown.
  • the image figure of the bending process of the manufacturing method of the reactor apparatus of this invention is shown.
  • the image figure of the lamination process of the manufacturing method of the reactor apparatus of this invention is shown.
  • Fig. 3 shows a wound core unit formed after a cutting-lamination-stacking-bending-retaining process.
  • the shape-retaining part details of the formed wound core unit as seen from the B direction in FIG. 3A are shown.
  • One Example of the wound core unit butt-joined is shown.
  • the other Example of the wound iron core unit butt-joined is shown.
  • Yet another embodiment of a wound core unit butt-joined is shown.
  • the structure which took the countermeasure against the fragmentation at the time of fabrication of the wound core unit after annealing is shown.
  • the fixing method of the reactor apparatus of this invention is shown.
  • the schematic structure of the reactor apparatus of this invention is shown.
  • the schematic structure of the reactor apparatus of another Example which gave the countermeasure against fringing is shown.
  • the detailed drawing of the wound core structure of the reactor apparatus of another Example is shown.
  • the manufacturing process of the wound core unit of the reactor apparatus of another Example is shown.
  • the shape retention state of the wound core unit of the reactor apparatus of another Example is shown.
  • the image figure of the cutting-lamination-stacking process of the manufacturing method of the reactor apparatus of this invention is shown.
  • the image figure of the butt connection part of the reactor apparatus of this invention is shown.
  • the reactor device of the present invention in order to solve the above problem, as shown in FIG. 1, a plurality of wound core units divided in advance from the time of winding core production are manufactured, and these are assembled and manufactured. is there. At that time, the magnetic flux density can be increased by increasing the cross-sectional area of the butt joint by bringing the connecting part to the corner part (R part) of the wound core unit without hardening the wound core unit with resin or the like. It is possible to suppress the fringing phenomenon that occurs at the joint.
  • FIG. 1 shows a schematic configuration diagram of a reactor device 10 of the present invention.
  • a plurality of amorphous coil thin plate materials are previously cut and stacked, and the wound core units 2 a and 2 b formed after stacking a plurality of stacked amorphous materials are stacked.
  • the reactor units 10a and 10b are divided into a plurality of pieces in advance, and then assembled in the direction of the arrow.
  • the wound iron core units 2a and 2b are held in shape by tightening with the fastening screw means 3 and 3 without being held in shape with resin or the like.
  • each wound core unit 2a, 2b is a corner portion (R portion) 5 of the iron core, and the butt portion 4 is a cut surface 4a, 4b portion.
  • FIG. 2A shows a cutting element of the wound core unit 2 prepared by unwinding the amorphous coil material 20 wound with an amorphous thin plate material and stacking the amorphous material cut into a predetermined length by the stopper 21 and the cutting means 22.
  • An image diagram is shown.
  • the cutting length and overlapping position of the amorphous material are calculated in advance so as to have a shape as shown in the drawing.
  • the wound core unit 2 on the support member 23 is bent along a bending die 25 by a press machine (not shown) as shown in FIG. 2B.
  • Reference numeral 24 can be used as a fixed core after bending.
  • the fixed core metal 32 is fastened and fixed with a plurality of screws 33 as shown in FIG. 3A.
  • FIG. 3B is a side view of the iron core unit 2 shown in FIG. 3A, and the wound iron core unit 2 is sandwiched between the fixed core metal 32 and fastened with a plurality of screws 33.
  • the actual thickness of the amorphous coil thin plate material 20 is 0.0235 mm, 5 to 20 sheets are cut to the same length, and a plurality of layers are laminated, and the laminated bodies 20a, 20b, 20c, 20d, .. Are stacked to form the wound core unit 2. Therefore, as shown in FIG. 2C, the end surface of the wound core unit 2 is formed in steps.
  • FIG. 12 shows a cutting-lamination-stacking process of the amorphous coil thin plate material 20.
  • the amorphous coil material 20 wound with the amorphous thin plate material is rewound, abutted against the stopper 21, and cut into a predetermined length by the cutting means 22.
  • the length of the amorphous coil thin plate material 20 to be cut is determined by the distance (l) between the stopper 21 and the cutting means 22.
  • the distance (l) between the stopper 21 and the cutting means 22 is determined by the stopper 21 and the fixed cutting blade 28 that are screw-engaged with the drive screw 27.
  • the distance (l) can be changed by rotating the drive screw 27 by the motor 26.
  • the wound core units 2a and 2b are annealed in a magnetic field in order to remove stress from the wound core units 2a and 2b, shape the iron core, and give the amorphous material a magnetic direction.
  • annealing is performed in the shape of the completed wound core as shown in FIGS. 4A, 4B and 4C so that the iron core forms a closed magnetic circuit.
  • the butt connection portion 4 of the wound core unit 2 is arranged at the corner portion (R portion) 5 of the reactor device, but the arrangement position can be selected.
  • two or more wound core units 2 can be used in an appropriate number.
  • the wound core unit 2 cut, stacked and stacked from the process shown in FIG. 2A is bent by the process shown in FIG. 2B.
  • the wound core unit 2 cut, laminated, and stacked in the state shown in FIG. 2C is bent with the short-length laminated body inside, so that the difference dimension (s ′) of the length of each step is The value is smaller than S (s> s ′). This is because the bending radius of the laminated outer amorphous thin plate material becomes larger.
  • the lamination thickness (t) of the laminates 20a, 20b, 20c, 20d ... of the amorphous coil thin plate material and the lengths of the laminates 20a, 20b, 20c, 20d ... of each step after the bending process can be made substantially the same.
  • the butt connection portion 4 of the reactor device can be configured without a gap as shown in FIG.
  • the cutting length control of the amorphous coil thin plate material at each stage can be achieved by controlling the rotation of the motor 26 by a control device (not shown).
  • the position of the intermediate point 29 between the stopper 21 and the fixed cutting blade 28 is fixed at a fixed position.
  • the laminated body 20a, 20b, 20c, 20d,... Of the amorphous coil thin plate material at each stage is laminated and stacked with the central portion of the bisect length positioned at the intermediate point 29. Thereby, the steps of both end portions are formed in the same manner by bending.
  • the wound iron core unit 2 after annealing is provided with a fixing metal fitting 51 inside the window of the wound iron core unit 2, wrapped around the wound iron core unit 2 with insulating paper (no reference), and wound with a filament tape 52.
  • this insulating paper also serves as a measure to prevent debris scattering of the amorphous material, so be careful not to tear the insulating paper.
  • not only the insulating paper but also a press board or the like has a strength and a thin material via a gap member 53. Fix it.
  • Fig. 6 shows how the reactor unit 10 is assembled.
  • the legs of the formed wound core units 2a and 2b are put into the coil units 1a and 1b, and the parts of the reactor units 10a and 10b are assembled as shown in FIG.
  • the reactor units 10a and 10b are fixed by sandwiching the wound core units 2a and 2b from above and below by pressing the contents fixing brackets 61 and 62 from above and below.
  • the iron core units 2a, 2b and the coil units 1a, 1b are fixed in the contents fixing brackets 61, 62.
  • the magnetic characteristics of the reactor device 10 are adjusted by sandwiching a gap member (reference numeral 53 in FIG. 5) such as a press board (not indicated) in the butt joint 4 and finely adjusting the gap. Or, it is adjusted by adjusting the tightening strength of the contents fixing brackets 71 and 71 (the specific adjustment method is omitted).
  • a gap member reference numeral 53 in FIG. 5
  • a press board not indicated
  • the characteristic of the reactor device 10 of the present invention is that the magnetic characteristics can be adjusted in the assembled state (FIG. 7). Moreover, even if the capacity
  • Example 2 is shown below for an iron core shape specialized for fringing countermeasures.
  • the butt center portion of the wound core units 9a and 9b is formed in a convex state to suppress the deterioration of fringing.
  • FIG. 9 shows a joining image of the butted portion A of the wound core unit 9a, 9b in that case.
  • Fringeing is a phenomenon in which magnetic flux leaking from the gap portion at the butt joint of the wound core units 9a and 9b collects on the outer peripheral side of the core. Therefore, by making the butt joint of the wound core units 9a and 9b convex at the center as shown in FIG. 9A, the magnetic flux is concentrated at the center of the core cross section, and the leakage magnetic flux is again in the core.
  • the purpose of the structure of the second embodiment is to increase the apparent sectional area.
  • the manufacturing method of the reactor device of the second embodiment is almost the same as that of the first embodiment.
  • the wound core material is drawn out for a predetermined length, cut and laminated as shown in FIG. 10, and then the wound core unit 9a is fixed.
  • the units 9a and 9b and the coil units 8a and 8b are assembled.
  • FIG. 11 shows the shape retention state of the wound core unit of the reactor device according to the second embodiment.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

Selon l'invention, un matériau amorphe, qui est un matériau à noyau ferreux pour un dispositif réacteur, a une plus faible aptitude au traitement et une plus grande amplitude de perte dans le fer/détérioration lorsqu'une contrainte de traitement est appliquée, par comparaison à une tôle d'acier au silicium qui est utilisée pour la même fin. Pour ces raisons, il a été difficile de fabriquer un dispositif réacteur de grande capacité. Ainsi, sont proposés un procédé de fabrication d'un noyau ferreux pour un réacteur et une forme du noyau ferreux qui sont appropriés pour un matériau amorphe. Dans la présente invention, afin de résoudre les problèmes mentionnés ci-dessus, une unité noyau ferreux enroulée, qui est divisée à l'avance en de multiples pièces, comme illustré sur la figure 1, lors de la fabrication d'un noyau ferreux, est produite et est installée. A cet égard, le noyau ferreux n'est pas encapsulé d'une résine ou analogue pour empêcher la dégradation par contrainte d'un matériau amorphe, et une partie de connexion est installée au niveau d'une partie (R) du noyau ferreux pour augmenter l'air de la section transversale de la partie de connexion, réduisant de cette façon la densité de flux magnétique et empêchant l'apparition d'un phénomène de distorsion dans la partie de connexion.
PCT/JP2011/069556 2010-12-03 2011-08-30 Dispositif réacteur utilisant un matériau amorphe et son procédé de fabrication Ceased WO2012073565A1 (fr)

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JP2010270638 2010-12-03
JP2010-270638 2010-12-03
JP2011180398A JP2012134448A (ja) 2010-12-03 2011-08-22 アモルファス材を使用したリアクトル装置及びその製造方法
JP2011-180398 2011-08-22

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Cited By (4)

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CN103971896A (zh) * 2014-04-17 2014-08-06 黄叶芳 核电站用r型铁芯
CN108257764A (zh) * 2018-01-25 2018-07-06 江苏国能合金科技有限公司 非晶变压器铁心
CN112313762A (zh) * 2018-10-03 2021-02-02 日本制铁株式会社 卷铁芯及变压器
US12394552B2 (en) 2019-09-10 2025-08-19 Nippon Steel Corporation Wound core

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JP6640015B2 (ja) * 2016-05-09 2020-02-05 東芝産業機器システム株式会社 巻鉄心
JP6781528B1 (ja) * 2019-07-17 2020-11-04 三菱電機株式会社 リアクトル及び電力変換装置
JP2025109423A (ja) * 2024-01-12 2025-07-25 株式会社日立産機システム アモルファス変圧器およびその製造方法

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JP2006505143A (ja) * 2002-11-01 2006-02-09 メトグラス・インコーポレーテッド バルク非晶質金属誘導デバイス

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JPS6086813A (ja) * 1983-10-18 1985-05-16 Toshiba Corp カツトコアの製造方法
JPS62265711A (ja) * 1986-05-14 1987-11-18 Toshiba Corp 変圧器の製造方法
JPH01289229A (ja) * 1988-05-17 1989-11-21 Daihen Corp 巻鉄心の製造方法
JPH0279858U (fr) * 1988-12-06 1990-06-20
JP2006505143A (ja) * 2002-11-01 2006-02-09 メトグラス・インコーポレーテッド バルク非晶質金属誘導デバイス
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103971896A (zh) * 2014-04-17 2014-08-06 黄叶芳 核电站用r型铁芯
CN108257764A (zh) * 2018-01-25 2018-07-06 江苏国能合金科技有限公司 非晶变压器铁心
CN112313762A (zh) * 2018-10-03 2021-02-02 日本制铁株式会社 卷铁芯及变压器
CN112313762B (zh) * 2018-10-03 2024-02-09 日本制铁株式会社 卷铁芯及变压器
US12394552B2 (en) 2019-09-10 2025-08-19 Nippon Steel Corporation Wound core

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