JP7299464B2 - Grain-oriented electrical steel sheet, grain-oriented electrical steel sheet for wound core transformer, method for manufacturing wound core, and method for manufacturing wound core transformer - Google Patents

Grain-oriented electrical steel sheet, grain-oriented electrical steel sheet for wound core transformer, method for manufacturing wound core, and method for manufacturing wound core transformer Download PDF

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JP7299464B2
JP7299464B2 JP2018187873A JP2018187873A JP7299464B2 JP 7299464 B2 JP7299464 B2 JP 7299464B2 JP 2018187873 A JP2018187873 A JP 2018187873A JP 2018187873 A JP2018187873 A JP 2018187873A JP 7299464 B2 JP7299464 B2 JP 7299464B2
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尚 茂木
史明 高橋
聡 新井
雅人 溝上
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Nippon Steel Corp
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本発明は、方向性電磁鋼板、巻鉄心変圧器用方向性電磁鋼板、巻鉄心の製造方法及び巻鉄心変圧器の製造方法に関する。 The present invention relates to a grain-oriented electrical steel sheet, a grain-oriented electrical steel sheet for a wound core transformer, a method for manufacturing a wound core, and a method for manufacturing a wound core transformer.

方向性電磁鋼板の用途の一つである変圧器(トランス)には、省エネルギー化、周辺環境への配慮から、低鉄損、低騒音が求められている。そのため、近年、低鉄損及び騒音特性に優れる方向性電磁鋼板の開発が進められている。 Transformers, one of the applications of grain-oriented electrical steel sheets, are required to have low iron loss and low noise in order to save energy and consider the surrounding environment. Therefore, in recent years, the development of grain-oriented electrical steel sheets with excellent low core loss and noise characteristics has been promoted.

例えば、特許文献1には、鋼板表面に張力付与型の絶縁被膜を備え、鋼板の片面に歪みを導入して磁区構造を変化させた方向性電磁鋼板であって、歪み導入処理前における張力付与型絶縁被膜の鋼板面に対する付与張力が所定の値の範囲にあり、かつ歪み導入処理後における歪み導入面の鋼板反り量が1mm以上10mm以下であることを特徴とする方向性電磁鋼板が開示されている。 For example, Patent Document 1 discloses a grain-oriented electrical steel sheet in which a tension-applying insulating coating is provided on the surface of the steel sheet, strain is introduced on one side of the steel sheet to change the magnetic domain structure, and tension is applied before the strain introduction treatment. Disclosed is a grain-oriented electrical steel sheet characterized in that the tension applied to the steel sheet surface of the type insulating coating is within a predetermined value range, and the steel sheet warp amount of the strain-introduced surface after the strain-introducing treatment is 1 mm or more and 10 mm or less. ing.

また、例えば、特許文献2には、鋼板の表裏面にフォルステライト被膜および張力コーティングを備える方向性電磁鋼板に、線状の熱歪みを導入する磁区細分化処理が施された方向性電磁鋼板であって、該鋼板の圧延方向の反り量が前記歪みの導入面を内側とする反り面の曲率半径が600mm以上6000mm以下であり、かつ前記圧延方向と直角方向の反り量が前記歪みの導入面を内側とする反り面の曲率半径で2000mm以上であることを特徴とする方向性電磁鋼板が開示されている。 Further, for example, Patent Document 2 discloses a grain-oriented electrical steel sheet having a forsterite coating and a tension coating on the front and back surfaces of the steel sheet, which is subjected to a magnetic domain refining treatment that introduces linear thermal strain. The amount of warp in the rolling direction of the steel sheet is such that the radius of curvature of the warped surface with the strain introduction surface as an inner side is 600 mm or more and 6000 mm or less, and the amount of warp in the direction perpendicular to the rolling direction is the strain introduction surface. A grain-oriented electrical steel sheet characterized by a curvature radius of 2000 mm or more of the warped surface with the inside is disclosed.

また、例えば、特許文献3には、表面にフォルステライト被膜および絶縁コーティングを備えた方向性電磁鋼板であって、上記方向性電磁鋼板の磁歪特性が、所定の条件を満足し、前記フォルステライト被膜と前記絶縁コーティングの合計張力の表裏差が0.5MPa未満であって、前記フォルステライト被膜の張力の表裏差が0.5MPa以上であることを特徴とする方向性電磁鋼板が開示されている。 Further, for example, Patent Document 3 discloses a grain-oriented electrical steel sheet having a forsterite coating and an insulating coating on the surface, wherein the magnetostrictive characteristics of the grain-oriented electrical steel sheet satisfy predetermined conditions, and the forsterite coating and the insulating coating have a total tension difference of less than 0.5 MPa, and the forsterite coating has a tension difference of 0.5 MPa or more.

特開2012-52228号公報Japanese Unexamined Patent Application Publication No. 2012-52228 国際公開第2013/99160号WO2013/99160 国際公開第2016/125504号WO2016/125504

しかしながら、騒音は小さいほど好ましく、従来の方向性電磁鋼板には未だ改善の余地がある。そこで、本発明は、上記問題に鑑みてなされたものであり、本発明の目的とするところは、騒音特性に優れた、方向性電磁鋼板、巻鉄心変圧器用方向性電磁鋼板、巻鉄心の製造方法、及び巻鉄心変圧器の製造方法を提供することにある。 However, the smaller the noise, the better, and conventional grain-oriented electrical steel sheets still have room for improvement. Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to manufacture grain-oriented electrical steel sheets, grain-oriented electrical steel sheets for wound core transformers, and wound cores that are excellent in noise characteristics. It is to provide a method and a manufacturing method of a wound core transformer.

上記課題の解決のため、本発明者らは、鋭意検討し、方向性電磁鋼板の反りに着目した。従来、平坦で曲率が小さい方向性電磁鋼板ほど、変圧器の騒音特性が向上すると考えられていた。しかし、本発明者らは、巻鉄心変圧器においては、反りを有する方向性電磁鋼板を巻き回して巻鉄心を形成することで、巻鉄心における当該鋼板間の隙間が狭くなり、変圧器の騒音特性が向上することを見出し、さらに検討した結果、本発明に至った。 In order to solve the above problems, the inventors of the present invention conducted intensive studies and paid attention to the warpage of grain-oriented electrical steel sheets. Conventionally, it was thought that a flat grain-oriented electrical steel sheet with a small curvature would improve the noise characteristics of a transformer. However, the inventors of the present invention have found that, in a wound core transformer, by winding grain-oriented electrical steel sheets having warpage to form a wound core, the gap between the steel sheets in the wound core becomes narrower, resulting in noise in the transformer. As a result of finding that the properties are improved and further studies, the present invention was completed.

上記知見に基づき完成された本発明の要旨は、以下の通りである。
(1) 圧延方向に280mmに切り出した鋼片を、圧延面内における圧延方向と垂直な方向が鉛直方向と一致するように前記鋼片の圧延方向の一端を圧延方向に沿って30mm固定した際に、前記鋼片の圧延方向の他端における板厚方向の変位量が13mm以上30mm未満である反りを有し、巻鉄心変圧器に用いられる、巻鉄心変圧器用方向性電磁鋼板。
(2) 圧延方向に280mmに切り出した鋼片を、圧延面内における圧延方向と垂直な方向が鉛直方向と一致するように前記鋼片の圧延方向の一端を圧延方向に沿って30mm固定した際に、前記鋼片の圧延方向の他端における板厚方向の変位量が13mm以上30mm未満である反りを有し、一方の面に、溝加工が施されている、方向性電磁鋼板。
(3) 圧延方向に280mmに切り出した鋼片を、圧延面内における圧延方向と垂直な方向が鉛直方向と一致するように前記鋼片の圧延方向の一端を圧延方向に沿って30mm固定した際に、前記鋼片の圧延方向の他端における板厚方向の変位量が20mm以上30mm未満である反りを有する、方向性電磁鋼板。
) 一方の面に、線状の熱ひずみが導入されている、上記(1)~(3)のいずれかに記載の方向性電磁鋼板。
) 板厚が、0.18mm以上0.35mm以下である、上記(1)~(4)のいずれかに記載の方向性電磁鋼板。
(6) 上記(2)~(5)のいずれかに記載の方向性電磁鋼板を、前記反りに沿って巻き回す工程を含む、巻鉄心の製造方法。
(7) 上記(2)~(5)のいずれかに記載の方向性電磁鋼板を、前記反りに沿って巻き回す工程を含む、巻鉄心変圧器の製造方法。
(8) 上記(1)に記載の巻鉄心変圧器用方向性電磁鋼板を、前記反りに沿って巻き回す工程を含む、巻鉄心の製造方法。
(9) 上記(1)に記載の巻鉄心変圧器用方向性電磁鋼板を、前記反りに沿って巻き回す工程を含む、巻鉄心変圧器の製造方法。
The gist of the present invention completed based on the above knowledge is as follows.
(1) When a steel slab cut to 280 mm in the rolling direction is fixed by 30 mm along the rolling direction at one end of the steel slab in the rolling direction so that the direction perpendicular to the rolling direction in the rolling plane coincides with the vertical direction. (2 ) a grain-oriented electrical steel sheet for a wound core transformer, which has a warpage in which the amount of displacement in the plate thickness direction at the other end of the billet in the rolling direction is 13 mm or more and less than 30 mm, and is used for a wound core transformer;
(2) When a steel slab cut to 280 mm in the rolling direction is fixed by 30 mm along the rolling direction at one end of the steel slab in the rolling direction so that the direction perpendicular to the rolling direction in the rolling plane coincides with the vertical direction. (2) a grain-oriented electrical steel sheet having a warp of 13 mm or more and less than 30 mm in thickness direction displacement at the other end of the billet in the rolling direction, and having one surface grooved;
(3) When a steel slab cut to 280 mm in the rolling direction is fixed by 30 mm along the rolling direction at one end of the steel slab in the rolling direction so that the direction perpendicular to the rolling direction in the rolling plane coincides with the vertical direction. (2) a grain-oriented electrical steel sheet having a warp in which the amount of displacement in the plate thickness direction at the other end of the billet in the rolling direction is 20 mm or more and less than 30 mm;
( 4 ) The grain-oriented electrical steel sheet according to any one of (1) to (3) above , wherein linear thermal strain is introduced on one surface.
( 5 ) The grain-oriented electrical steel sheet according to any one of (1) to (4) above , having a thickness of 0.18 mm or more and 0.35 mm or less.
(6) A method for manufacturing a wound core, comprising winding the grain-oriented electrical steel sheet according to any one of (2) to (5) above along the warp.
(7) A method for manufacturing a wound core transformer, comprising winding the grain-oriented electrical steel sheet according to any one of (2) to (5) above along the warp.
(8) A method for manufacturing a wound core, comprising winding the grain-oriented electrical steel sheet for a wound core transformer according to (1) above along the warp.
(9) A method for manufacturing a wound core transformer, comprising winding the grain-oriented electrical steel sheet for a wound core transformer according to (1) above along the warp.

本発明によれば、騒音特性に優れた、方向性電磁鋼板、巻鉄心変圧器用方向性電磁鋼板、巻鉄心の製造方法及び巻鉄心変圧器の製造方法を提供することが可能となる。 ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the grain-oriented electrical steel sheet, the grain-oriented electrical steel sheet for wound core transformers, the manufacturing method of a wound core, and the manufacturing method of a wound core transformer which are excellent in a noise characteristic.

方向性電磁鋼板の板厚方向の変位量の測定方法を説明するための模式図である。FIG. 3 is a schematic diagram for explaining a method for measuring the amount of displacement in the plate thickness direction of a grain-oriented electrical steel sheet; 本発明の一実施形態に係る巻鉄心変圧器の一例を示す平面図である。1 is a plan view showing an example of a wound core transformer according to an embodiment of the present invention; FIG.

以下に添付図面を参照しながら、本発明の好適な実施の形態について詳細に説明する。なお、本明細書及び図面において、実質的に同一の機能構成を有する構成要素については、同一の符号を付することにより重複説明を省略する。また、図中の各構成要素の比率、寸法は、実際の各構成要素の比率、寸法を表すものではない。 Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the present specification and drawings, constituent elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description. Also, the ratios and dimensions of each component in the drawings do not represent the actual ratios and dimensions of each component.

<1.方向性電磁鋼板>
まず、図1を参照して、本実施形態に係る方向性電磁鋼板について説明する。図1は、方向性電磁鋼板の板厚方向の変位量の測定方法を説明するための模式図である。
<1. Grain-oriented electrical steel sheet>
First, a grain-oriented electrical steel sheet according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic diagram for explaining a method for measuring the amount of displacement in the thickness direction of a grain-oriented electrical steel sheet.

本実施形態に係る方向性電磁鋼板は、熱間圧延及び冷間圧延がされた方向性電磁鋼板であり、図1に示すように、圧延方向に長さ280mmに切り出した鋼片を、圧延面内における圧延方向と垂直な方向が鉛直方向と一致するように前記鋼片の圧延方向の一端を圧延方向に沿って30mm固定した際に、当該鋼片の圧延方向の他端における板厚方向の変位量w(反り量)が13mm以上30mm未満である反りを有する。本実施形態に係る方向性電磁鋼板を巻き回して巻鉄心を形成することで、巻き回されて隣り合う方向性電磁鋼板の間の隙間を小さくすることができる。その結果、当該巻鉄心を用いて製造された変圧器の作動時の騒音を低減することが可能となる。本実施形態に係る方向性電磁鋼板の反り量は、好ましくは、13mm以上25mm以下であり、更に好ましくは、19mm以上23mm以下である。 The grain-oriented electrical steel sheet according to the present embodiment is a grain-oriented electrical steel sheet that has been hot-rolled and cold-rolled. As shown in FIG. When one end of the billet in the rolling direction is fixed by 30 mm along the rolling direction so that the direction perpendicular to the rolling direction in the inside coincides with the vertical direction, the thickness direction of the other end of the billet in the rolling direction It has a warp in which the amount of displacement w (amount of warp) is 13 mm or more and less than 30 mm. By winding the grain-oriented electrical steel sheets according to the present embodiment to form a wound core, it is possible to reduce the gap between adjacent grain-oriented electrical steel sheets that are wound. As a result, it is possible to reduce noise during operation of a transformer manufactured using the wound core. The warp amount of the grain-oriented electrical steel sheet according to the present embodiment is preferably 13 mm or more and 25 mm or less, more preferably 19 mm or more and 23 mm or less.

本実施形態に係る方向性電磁鋼板の厚みは、例えば、0.18mm以上0.35mm以下とすることができる。好ましくは、方向性電磁鋼板の厚みは、0.18mm以上0.27mm以下である。厚みを0.30mmより大きくすると鉄損が増大するため、本実施形態に係る方向性電磁鋼板の厚みは、0.27mm以下とすることが好ましい。厚みを0.20mm以上とすることで、製造工程において、反り量の制御を容易に行うことが可能となる。本実施形態に係る方向性電磁鋼板の厚みは、より好ましくは、0.23mm以上0.27mm以下である。 The thickness of the grain-oriented electrical steel sheet according to the present embodiment can be, for example, 0.18 mm or more and 0.35 mm or less. Preferably, the grain-oriented electrical steel sheet has a thickness of 0.18 mm or more and 0.27 mm or less. If the thickness is larger than 0.30 mm, iron loss increases, so the thickness of the grain-oriented electrical steel sheet according to the present embodiment is preferably 0.27 mm or less. By setting the thickness to 0.20 mm or more, it is possible to easily control the amount of warpage in the manufacturing process. The thickness of the grain-oriented electrical steel sheet according to the present embodiment is more preferably 0.23 mm or more and 0.27 mm or less.

本実施形態に係る方向性電磁鋼板は、特に制限されるものではなく、公知の鋼成分からなる方向性電磁鋼板を用いることができる。このような方向性電磁鋼板として、例えば、質量%で2~7%のSiを少なくとも含有する方向性電磁鋼板を挙げることができる。鋼成分中のSi濃度を2%以上とすることで、所望の磁気特性を実現することが可能となる。一方、鋼成分中のSi濃度が7%超となる場合には、鋼板の脆性が低く、製造が困難となるため、鋼成分中のSi濃度は7%以下であることが好ましい。 The grain-oriented electrical steel sheet according to the present embodiment is not particularly limited, and a grain-oriented electrical steel sheet made of known steel components can be used. As such a grain-oriented electrical steel sheet, for example, a grain-oriented electrical steel sheet containing at least 2 to 7% by mass of Si can be mentioned. Desired magnetic properties can be achieved by setting the Si concentration in the steel composition to 2% or more. On the other hand, if the Si concentration in the steel composition exceeds 7%, the brittleness of the steel sheet is low and production becomes difficult, so the Si concentration in the steel composition is preferably 7% or less.

本実施形態に係る方向性電磁鋼板の表面は、絶縁処理が施されていることが好ましい。方向性電磁鋼板の表面に絶縁処理が施されていることで、方向性電磁鋼板を巻き回して形成した巻鉄心において、方向性電磁鋼板同士の間が絶縁されるため、板厚面内において渦電流が生じ難くなり、渦電流損を低減することが可能となる。その結果、鉄損を低減することが可能となる。例えば、方向性電磁鋼板の表面は、コロイダルシリカ及びリン酸塩を含有する絶縁コーティング液を用いて絶縁処理が施されていることが好ましい。 The surface of the grain-oriented electrical steel sheet according to the present embodiment is preferably subjected to an insulation treatment. Insulation treatment is applied to the surface of the grain-oriented electrical steel sheets, so that in the wound core formed by winding the grain-oriented electrical steel sheets, the space between the grain-oriented electrical steel sheets is insulated. Current is less likely to occur, and eddy current loss can be reduced. As a result, iron loss can be reduced. For example, the surface of the grain-oriented electrical steel sheet is preferably subjected to insulation treatment using an insulation coating liquid containing colloidal silica and phosphate.

本実施形態に係る方向性電磁鋼板は、既存の方向性電磁鋼板の製造工程に加えて、反り制御工程を経ることで製造される。本実施形態に係る方向性電磁鋼板は、例えば、所定の組成を有するスラブを熱延鋼板とする熱間圧延工程、熱延鋼板に冷間圧延を施して冷延鋼板とする冷間圧延工程、冷延鋼板のひずみを除去して一次再結晶する一次再結晶焼鈍工程、Goss方位の結晶粒を優先的に再結晶させる二次再結晶焼鈍工程、及び反り量制御工程を経て製造される。方向性電磁鋼板の製造に使用されるスラブは、既存の方向性電磁鋼板の製造に使用されるスラブを用いることができる。また、熱間圧延工程、冷間圧延工程、一次再結晶焼鈍工程、及び二次再結晶焼鈍工程は、既存の方法で実施することができる。以下に、反り量制御工程について説明する。 The grain-oriented electrical steel sheet according to the present embodiment is manufactured through a warpage control process in addition to the existing manufacturing process of a grain-oriented electrical steel sheet. For example, the grain-oriented electrical steel sheet according to the present embodiment is produced by a hot-rolling process in which a slab having a predetermined composition is used as a hot-rolled steel sheet, a cold-rolling process in which the hot-rolled steel sheet is cold-rolled to obtain a cold-rolled steel sheet, It is manufactured through a primary recrystallization annealing process for removing strain from the cold-rolled steel sheet and primary recrystallization, a secondary recrystallization annealing process for preferentially recrystallizing Goss-oriented crystal grains, and a warpage amount control process. The slab used for manufacturing the grain-oriented electrical steel sheet can be the slab used for manufacturing the existing grain-oriented electrical steel sheet. Also, the hot rolling process, the cold rolling process, the primary recrystallization annealing process, and the secondary recrystallization annealing process can be carried out by existing methods. The warp amount control process will be described below.

一般に、二次再結晶焼鈍工程ではコイル状の鋼板に対して焼鈍を行うため、二次再結晶焼鈍工程後の鋼板には、巻きぐせがついている。反り量制御工程では、二次焼鈍工程後の鋼板に対し、所定の熱処理が施されることで、巻ぐせが矯正されて方向性電磁鋼板の反り量が制御される。反り量制御工程では、二次再結晶焼鈍工程後に、一般に行われる平坦化焼鈍工程の焼鈍温度及び通板張力を変更して熱処理が行われる。 Generally, in the secondary recrystallization annealing process, the coiled steel sheet is annealed, so the steel sheet after the secondary recrystallization annealing process has curling. In the warp amount control process, the steel sheet after the secondary annealing process is subjected to a predetermined heat treatment to correct the curl and control the warp amount of the grain-oriented electrical steel sheet. In the warp amount control process, after the secondary recrystallization annealing process, heat treatment is performed by changing the annealing temperature and sheet threading tension in the flattening annealing process which is generally performed.

反り量制御工程は、従来の二次再結晶焼鈍工程後に行われる平坦化焼鈍の温度より10℃~20℃程度低い温度で行われる。例えば、従来の平坦化焼鈍温度が850℃である場合、反り量制御工程における焼鈍温度は、830℃以上840℃以下とすることができる。反り量制御工程における焼鈍温度は、好ましくは、830℃以上837℃以下であり、さらに好ましくは、830℃以上835℃以下である。 The warpage amount control process is performed at a temperature about 10° C. to 20° C. lower than the temperature of the flattening annealing performed after the conventional secondary recrystallization annealing process. For example, when the conventional planarization annealing temperature is 850° C., the annealing temperature in the warp amount control step can be 830° C. or higher and 840° C. or lower. The annealing temperature in the warp amount control step is preferably 830° C. or higher and 837° C. or lower, and more preferably 830° C. or higher and 835° C. or lower.

通板張力は、従来の二次再結晶焼鈍工程後に行われる平坦化焼鈍の通板張力より10%~20%程度小さい張力で行われる。例えば、従来の平坦化焼鈍における通板張力が7N/mmである場合、通板張力は、5.6N/mm以上6.3N/mm以下とすることができる。従来の通板張力より10%~20%程度小さい張力で通板することで、反り量制御工程後の方向性電磁鋼板の鋼片の反り量を、13mm以上30mm未満とすることができる。通板張力は、好ましくは、5.5N/mm以上6.5N/mm以下であり、さらに好ましくは、5.8N/mm以上6.2N/mm以下である。 The threading tension is about 10% to 20% lower than the threading tension in the flattening annealing performed after the conventional secondary recrystallization annealing step. For example, when the sheet threading tension in conventional flattening annealing is 7 N/mm 2 , the sheet threading tension can be 5.6 N/mm 2 or more and 6.3 N/mm 2 or less. By threading the steel sheet at a tension that is about 10% to 20% lower than the conventional threading tension, the amount of warpage of the grain-oriented electrical steel sheet after the warp amount control step can be set to 13 mm or more and less than 30 mm. The threading tension is preferably 5.5 N/mm 2 or more and 6.5 N/mm 2 or less, more preferably 5.8 N/mm 2 or more and 6.2 N/mm 2 or less.

反り量制御工程を経ることで、方向性電磁鋼板の鋼片の反り量を13mm以上30mm未満とすることができる。当該方向性電磁鋼板を反りに沿って巻き回して製造される巻鉄心は、方向性電磁鋼板間の隙間が狭くなる。その結果、当該巻鉄心を用いた変圧器の騒音特性を向上させることが可能となる。 Through the warp amount control step, the warp amount of the billet of the grain-oriented electrical steel sheet can be set to 13 mm or more and less than 30 mm. A wound core manufactured by winding the grain-oriented magnetic steel sheets along the warp has narrow gaps between the grain-oriented magnetic steel sheets. As a result, it is possible to improve the noise characteristics of a transformer using the wound core.

<2.巻鉄心及び巻鉄心変圧器>
続いて、図2を参照して、本発明の一実施形態に係る巻鉄心及び巻鉄心変圧器について説明する。図2は、本発明の一実施形態に係る巻鉄心変圧器の一例を示す平面図である。なお、以降、巻鉄心変圧器を単に変圧器と呼称することもある。
<2. Wound core and wound core transformer>
Next, a wound core and a wound core transformer according to an embodiment of the present invention will be described with reference to FIG. FIG. 2 is a plan view showing an example of a wound core transformer according to one embodiment of the present invention. In addition, henceforth, a wound core transformer may be called simply a transformer.

本実施形態に係る巻鉄心変圧器1は、反りを有する方向性電磁鋼板100が巻き回されて形成された巻鉄心10、巻鉄心10に巻き回された一次巻線20A及び二次巻線20Bを備える。 A wound core transformer 1 according to the present embodiment includes a wound core 10 formed by winding a warped grain-oriented electrical steel sheet 100, and a primary winding 20A and a secondary winding 20B wound around the wound core 10. Prepare.

巻鉄心10は、方向性電磁鋼板100が有する反りに沿って巻き回されて形成される。巻鉄心10の形状は、図示した角丸方形状に限られず、例えば、楕円形状、長円形状又は角丸方形状とすることができる。 The wound core 10 is formed by being wound along the warp of the grain-oriented electrical steel sheet 100 . The shape of the wound core 10 is not limited to the illustrated rectangular shape with rounded corners, and may be, for example, an elliptical shape, an elliptical shape, or a rectangular shape with rounded corners.

一次巻線20A及び二次巻線20Bは、巻鉄心10における対向する位置に、巻鉄心10に巻き回される。一次巻線20A及び二次巻線20Bには、既存の電線を用いることができ、例えば、高電気伝導性の金属線を絶縁体で被覆したものを用いることができる。金属線としては、例えば、銅、銅合金、アルミニウム、絶縁材料を塗って焼付けるエナメルで被覆された銅線などを用いることができる。金属線の表面を被覆する絶縁体には、例えば、ポリ塩化ビニル、ポリエチレン、フッ素樹脂、又はポリエステル等を用いることができる。 The primary winding 20A and the secondary winding 20B are wound around the wound core 10 at opposing positions on the wound core 10 . An existing electric wire can be used for the primary winding 20A and the secondary winding 20B, for example, a metal wire with high electrical conductivity covered with an insulator can be used. As the metal wire, for example, copper, a copper alloy, aluminum, or a copper wire coated with an enamel coated with an insulating material and baked can be used. For the insulator covering the surface of the metal wire, for example, polyvinyl chloride, polyethylene, fluororesin, polyester, or the like can be used.

一次巻線20Aの巻き数及び二次巻線20Bの巻き数は、特段制限されないが、例えば、巻鉄心変圧器1の仕様に応じて、一次巻線20Aの巻き数及び二次巻線20Bの巻き数を決定することができる。 The number of turns of the primary winding 20A and the number of turns of the secondary winding 20B are not particularly limited. The number of turns can be determined.

一次巻線20Aは、使用時においては、電源側の回路に接続され、電源から交流電圧が印加される。一次巻線20Aに交流電圧が印加されることにより、巻鉄心10に磁束が生じ、生じた磁束の変化により、負荷側の回路に接続された二次巻線20Bに、一次巻線20Aの巻き数と二次巻線20Bの巻き数とに応じた電圧が生じる。 During use, the primary winding 20A is connected to a circuit on the power supply side, and an AC voltage is applied from the power supply. By applying an AC voltage to the primary winding 20A, magnetic flux is generated in the wound core 10, and the change in the generated magnetic flux causes the secondary winding 20B connected to the circuit on the load side to turn on the primary winding 20A. A voltage is produced that depends on the number and the number of turns of the secondary winding 20B.

<3.変形例>
以上、本発明の一実施形態を説明した。以下では、本発明の上記実施形態の幾つかの変形例を説明する。なお、以下に説明する各変形例は、単独で本発明の上記実施形態に適用されてもよいし、組み合わせで本発明の上記実施形態に適用されてもよい。また、各変形例は、本発明の上記実施形態で説明した構成に代えて適用されてもよいし、本発明の上記実施形態で説明した構成に対して追加的に適用されてもよい。
<3. Variation>
An embodiment of the present invention has been described above. Several variations of the above embodiments of the invention are described below. It should be noted that each modified example described below may be applied to the above-described embodiment of the present invention alone, or may be applied in combination to the above-described embodiment of the present invention. Moreover, each modification may be applied in place of the configuration described in the above embodiment of the present invention, or may be additionally applied to the configuration described in the above embodiment of the present invention.

反り量制御工程において、二次再結晶後の鋼板の両面にそれぞれ異なる目付量でコーティング材を塗布し、先立って説明した焼鈍温度及び通板張力でコーティング材を焼き付けるコーティング処理を行ってもよい。また、コーティング処理は、反り量制御工程の後に行われてもよい。鋼板の板厚方向に、コーティング材の目付量に応じた張力が働くことによって鋼板に反りが生じ、本実施形態に係る方向性電磁鋼板が得られる。なお、鋼材へのコーティング材の塗布方法は、特段制限されず、公知の方法で行うことが可能である。 In the warpage amount control step, a coating process may be performed in which the coating material is applied to both surfaces of the steel sheet after secondary recrystallization with different basis weights, and the coating material is baked at the annealing temperature and sheet threading tension described above. Also, the coating process may be performed after the warp amount control process. Warpage occurs in the steel sheet due to the action of tension corresponding to the basis weight of the coating material in the thickness direction of the steel sheet, and the grain-oriented electrical steel sheet according to the present embodiment is obtained. The method of applying the coating material to the steel material is not particularly limited, and a known method can be used.

コーティング材の目付量は、例えば、3.1g/m以上6.6g/m以下とすることができる。コーティング材を上記範囲内で、鋼板の一方の面に塗布するコーティング材の目付量と他方の面に塗布するコーティング材の目付量とを異ならせることで、目付量が大きい面側に張力が作用し、反り量制御工程後の方向性電磁鋼板の鋼片の反り量を、13mm以上30mm未満とすることができる。また、コーティング材の目付量を、上記範囲とすることで、反り量制御工程後の方向性電磁鋼板に張力が付与され、この方向性電磁鋼板を用いて製造された変圧器の鉄損を低減することが可能となる。コーティング材の目付量は、好ましくは、3.5g/m以上6.5g/m以下である。 The basis weight of the coating material can be, for example, 3.1 g/m 2 or more and 6.6 g/m 2 or less. Within the above range, the weight of the coating material applied to one side of the steel plate and the weight of the coating material applied to the other side of the steel sheet are different, so that tension acts on the side with the larger weight. The amount of warpage of the billet of the grain-oriented electrical steel sheet after the warp amount control step can be set to 13 mm or more and less than 30 mm. In addition, by setting the basis weight of the coating material in the above range, tension is applied to the grain-oriented electrical steel sheet after the warp amount control process, and the iron loss of the transformer manufactured using this grain-oriented electrical steel sheet is reduced. It becomes possible to The basis weight of the coating material is preferably 3.5 g/m 2 or more and 6.5 g/m 2 or less.

コーティング材は、鋼材に張力を与えてその鋼材を反らせることができるものであり、目付量を変更しやすいものを使用することができる。コーティング材としては、好ましくは、コロイダルシリカ及びリン酸塩を含有する既存のコーティング液を用いることができる。コロイダルシリカ及びリン酸塩を含有するコーティング液を用いることで、板厚の小さい方向性電磁鋼板の反り量を制御することが可能となり、更に、方向性電磁鋼板の絶縁性を向上させることが可能となる。 The coating material can warp the steel material by applying tension to the steel material, and the coating material can be easily changed in basis weight. As the coating material, an existing coating liquid containing colloidal silica and phosphate can be preferably used. By using a coating liquid containing colloidal silica and a phosphate, it is possible to control the amount of warpage of a grain-oriented electrical steel sheet with a small thickness, and further improve the insulation properties of the grain-oriented electrical steel sheet. becomes.

コーティング処理における処理温度は、先だって説明した焼鈍温度範囲内で、用いられるコーティング材に応じて適宜変更することができる。例えば、コーティング材としてコロイダルシリカ及びリン酸塩を含有するコーティング液を用いる場合は、処理温度は、840℃以下とすることができる。 The treatment temperature in the coating treatment can be appropriately changed within the annealing temperature range described above, depending on the coating material used. For example, when a coating liquid containing colloidal silica and phosphate is used as the coating material, the treatment temperature can be 840° C. or lower.

また、反り量制御工程における焼鈍温度、通板張力及びコーティング材の目付量は、鋼板の厚みに応じて適宜変更することができる。これにより、板厚が異なる場合でも、方向性電磁鋼板の鋼片の反り量を、13mm以上30mm未満とすることができる。 Also, the annealing temperature, the sheet threading tension, and the basis weight of the coating material in the warp amount control step can be appropriately changed according to the thickness of the steel sheet. As a result, even when the plate thickness is different, the amount of warpage of the billet of the grain-oriented electrical steel sheet can be set to 13 mm or more and less than 30 mm.

また、本実施形態に係る方向性電磁鋼板には、一方の面に線状の熱ひずみを導入することができる。線状の熱ひずみの導入には、既存の方法を適用することができ、例えば、反り量制御工程後に、鋼板の一方の面にレーザーまたは電子ビーム等を照射して、線状の熱ひずみを導入することができる。線状の熱ひずみの導入位置は、特段制限されず、例えば、鋼板の圧延方向に対して垂直に横切る線状に導入することができる。線状の熱ひずみを導入することで、鋼板の磁区を細分化することができ、その結果、鉄損を低減することが可能となる。方向性電磁鋼板に熱ひずみを導入する場合、反り量制御工程における焼鈍温度、通板張力、コーティング材の目付量、またはレーザー等の照射条件は、熱ひずみ導入後の方向性電磁鋼板の鋼片の反り量が13mm以上30mm未満となるように設定されればよい。 In addition, linear thermal strain can be introduced to one surface of the grain-oriented electrical steel sheet according to the present embodiment. Existing methods can be applied to introduce linear thermal strain. For example, after the warp amount control process, one surface of the steel sheet is irradiated with a laser or an electron beam to introduce linear thermal strain. can be introduced. The position where the linear thermal strain is introduced is not particularly limited, and for example, it can be introduced in a linear shape perpendicular to the rolling direction of the steel sheet. By introducing linear thermal strain, the magnetic domains of the steel sheet can be subdivided, and as a result, iron loss can be reduced. When thermal strain is introduced into a grain-oriented electrical steel sheet, the annealing temperature, threading tension, basis weight of the coating material, or laser irradiation conditions in the warpage amount control process are is set to be 13 mm or more and less than 30 mm.

また、本実施形態に係る方向性電磁鋼板には、一方の面に溝加工を施すことができる。溝加工には、既存の方法を適用することができ、例えば、反り量制御工程後に、鋼板の一方の面に荷重をかけることで、方向性電磁鋼板の一方の面に溝を形成することができる。溝の位置は、特段制限されず、例えば、鋼板の圧延方向に対して垂直に横切る線状に形成することができる。方向性電磁鋼板に溝が形成されることで、鋼板の磁区を細分化することができ、その結果、鉄損を低減することが可能となる。方向性電磁鋼板に溝を形成する場合、反り量制御工程における焼鈍温度、通板張力、コーティング材の目付量、または溝加工の条件は、溝形成後の方向性電磁鋼板の鋼片の反り量が13mm以上30mm未満となるように設定されればよい。なお、溝の深さは、鋼板の磁区が細分化されれば特段制限されないが、例えば、10μm以上20μm以下とすることができる。また、溝の幅は、鋼板の磁区が細分化されれば特段制限されないが、例えば、0.1mm以上0.5mm以下とすることができる。 In addition, groove processing can be applied to one surface of the grain-oriented electrical steel sheet according to the present embodiment. Existing methods can be applied to the grooving. For example, grooves can be formed on one side of the grain-oriented electrical steel sheet by applying a load to one side of the steel sheet after the warp amount control process. can. The position of the groove is not particularly limited, and for example, the groove can be formed in a linear shape perpendicular to the rolling direction of the steel plate. By forming grooves in the grain-oriented electrical steel sheet, the magnetic domains of the steel sheet can be subdivided, and as a result, iron loss can be reduced. When grooves are formed in a grain-oriented electrical steel sheet, the conditions for annealing temperature, threading tension, basis weight of coating material, or grooving in the warpage amount control process are determined by the amount of warpage of the billet of the grain-oriented electrical steel sheet after groove formation. is set to be 13 mm or more and less than 30 mm. The depth of the grooves is not particularly limited as long as the magnetic domains of the steel sheet are subdivided, but can be, for example, 10 μm or more and 20 μm or less. The width of the groove is not particularly limited as long as the magnetic domains of the steel sheet are subdivided, but can be, for example, 0.1 mm or more and 0.5 mm or less.

また、本実施形態において、変圧器は、二巻線変圧器としたが、これに限られず、例えば、単巻線変圧器又は三巻線変圧器とすることができる。 Moreover, although the transformer is a two-winding transformer in the present embodiment, it is not limited to this, and may be, for example, a single-winding transformer or a three-winding transformer.

また、本実施形態に係る方向性電磁鋼板を適用することができる変圧器の容量は、特段制限されず、例えば、10kVA以上2000kVA以下の変圧器に適用することができる。 Moreover, the capacity of a transformer to which the grain-oriented electrical steel sheet according to the present embodiment can be applied is not particularly limited, and can be applied to a transformer of 10 kVA or more and 2000 kVA or less, for example.

以下に、実施例を示しながら、本発明の実施形態について、具体的に説明する。なお、以下に示す実施例は、本発明のあくまでも一例であって、本発明が、下記の例に限定されるものではない。 EXAMPLES The embodiments of the present invention will be specifically described below with reference to Examples. The examples shown below are merely examples of the present invention, and the present invention is not limited to the following examples.

(実施例1)
板厚が0.23mmの二次再結晶焼鈍工程後の鋼板を複数用意し、かかる鋼板に対して、表1に示す焼鈍温度及び通板張力で焼鈍を行った。焼鈍時間は、2分とした。当該焼鈍後の鋼板に、表1に示す目付量でコロイダルシリカ及びリン酸塩を含有するコーティング液を塗布し、840℃の温度で、1分、熱処理を施した。コーティング液の目付量を変えて、それぞれ異なる反り量の方向性電磁鋼板を製造した。
(Example 1)
A plurality of steel sheets having a thickness of 0.23 mm after the secondary recrystallization annealing process were prepared, and the steel sheets were annealed at the annealing temperature and sheet threading tension shown in Table 1. The annealing time was 2 minutes. A coating liquid containing colloidal silica and a phosphate was applied to the annealed steel sheet in the basis weight shown in Table 1, and heat treatment was performed at a temperature of 840°C for 1 minute. By changing the basis weight of the coating liquid, grain-oriented electrical steel sheets with different amounts of warpage were manufactured.

上記の方法で得られた方向性電磁鋼板を用いて巻鉄心を作製し、作成した巻鉄心に巻線を巻いて、容量が100kVA及び750kVAの巻鉄心変圧器を作製した。方向性電磁鋼板は、巻鉄心のコーナー部それぞれの曲率円の中心が一致するように巻き回した。巻線には、絶縁材料を塗って焼付けるエナメルで被覆された銅線を使用し、一次巻線の巻き数は1430とし、二次巻線の巻き数は50とした。 Wound cores were produced using the grain-oriented electrical steel sheets obtained by the above method, and windings were wound around the produced wound cores to produce wound core transformers with capacities of 100 kVA and 750 kVA. The grain-oriented electrical steel sheet was wound so that the centers of the curvature circles of the corner portions of the wound core were aligned. The windings used enamelled copper wire which was coated with an insulating material and baked, the number of turns of the primary winding was 1430 and the number of turns of the secondary winding was 50.

製造した方向性電磁鋼板の反り量を測定した。反り量の測定は次のようにして行った。まず、製造した方向性電磁鋼板から圧延方向に長さ280mmに鋼片を切り出した。切り出した鋼片を、圧延直角方向が鉛直方向と一致するように置き、鋼片の圧延方向の一端を圧延方向に沿って30mm固定した際に、鋼片の当該圧延方向の他端における板厚方向の変位量を反り量とした。 The amount of warpage of the produced grain-oriented electrical steel sheets was measured. The amount of warpage was measured as follows. First, a billet having a length of 280 mm was cut in the rolling direction from the manufactured grain-oriented electrical steel sheet. When the cut steel billet is placed so that the direction perpendicular to the rolling direction coincides with the vertical direction, and one end of the billet in the rolling direction is fixed 30 mm along the rolling direction, the plate thickness at the other end of the billet in the rolling direction The amount of displacement in the direction was taken as the amount of warpage.

また、作製した巻鉄心変圧器について、JEC-2200に準じて騒音(音圧)を測定した。一般に、音圧が3dB変化したときに、人間は音の大きさの変化を認識することができることから、反り量が0mmの方向性電磁鋼板で製造された変圧器の音圧を基準として、3dB以上音圧が低減した場合を、騒音特性が向上したと判断した。 In addition, noise (sound pressure) was measured according to JEC-2200 for the wound core transformers thus produced. In general, when the sound pressure changes by 3 dB, humans can perceive a change in the volume of the sound. When the sound pressure was reduced as described above, it was determined that the noise characteristics were improved.

表1に、各方向性電磁鋼板の製造条件、反り量、及び騒音測定の結果を示す。 Table 1 shows the manufacturing conditions, warpage amounts, and noise measurement results of each grain-oriented electrical steel sheet.

Figure 0007299464000001
Figure 0007299464000001

試験No.1及び試験No.2は、評価の基準である。試験No.1は、反り量が0mmの方向性電磁鋼板を用いて、容量が750kVAの変圧器を作製した例である。試験No.1の音圧は、68.9dBであった。試験No.2は、反り量が0mmの方向性電磁鋼板を用いて、容量が100kVAの変圧器を作製した例である。試験No.2の音圧は、62.5dBであった。 Test no. 1 and test no. 2 is the evaluation criteria. Test no. 1 is an example in which a transformer with a capacity of 750 kVA is manufactured using a grain-oriented electrical steel sheet with a warp of 0 mm. Test no. 1 sound pressure was 68.9 dB. Test no. 2 is an example in which a transformer with a capacity of 100 kVA is manufactured using grain-oriented electrical steel sheets with a warp of 0 mm. Test no. 2 sound pressure was 62.5 dB.

試験No.3では、反り量が15mmであり、この方向性電磁鋼板を用いて製造された変圧器の音圧は、60.1dBとなり、試験No.1と比較して、騒音特性が向上した。試験No.4では、反り量が20mmであり、この方向性電磁鋼板を用いて製造された変圧器の音圧は、60.1dBとなり、試験No.1と比較して、騒音特性が向上した。また、試験No.5は、反り量が21mmであり、この方向性電磁鋼板を用いて製造された容量が100kVAの変圧器の音圧は、50.8dBとなり、試験No.2と比較して、騒音特性が向上した。 Test no. In Test No. 3, the amount of warp was 15 mm, and the sound pressure of the transformer manufactured using this grain-oriented electrical steel sheet was 60.1 dB. Compared to 1, the noise characteristics were improved. Test no. In Test No. 4, the amount of warp was 20 mm, and the sound pressure of the transformer manufactured using this grain-oriented electrical steel sheet was 60.1 dB. Compared to 1, the noise characteristics were improved. Also, test no. In Test No. 5, the amount of warp was 21 mm, and the sound pressure of a transformer with a capacity of 100 kVA manufactured using this grain-oriented electrical steel sheet was 50.8 dB. Compared to 2, the noise characteristics were improved.

一方で、試験No.6、試験No.7に示すように、反り量が13mm未満の方向性電磁鋼板を用いて製造された変圧器では、試験No.11に対する音圧の変化量が3dB未満であり、騒音特性の向上効果は得られなかった。これらの方向性電磁鋼板で製造された巻鉄心において、層を成す方向性電磁鋼板同士の間に比較的大きな隙間が生じ、この隙間によって振動音が大きくなったため、騒音特性は向上しなかったと考えられる。 On the other hand, Test No. 6, test no. As shown in Test No. 7, the transformer manufactured using grain-oriented electrical steel sheets with a warpage amount of less than 13 mm was tested. The amount of change in sound pressure with respect to 11 was less than 3 dB, and no improvement in noise characteristics was obtained. In wound cores manufactured with these grain-oriented electrical steel sheets, a relatively large gap was generated between layers of grain-oriented electrical steel sheets, and this gap increased the vibration noise, so it is thought that the noise characteristics did not improve. be done.

また、試験No.8に示すように、反り量が31mmの方向性電磁鋼板を用いて製造された変圧器では、音圧は67.0dBであり、試験No.1に対する音圧の変化量が1.9dBであり、騒音特性の向上効果は得られなかった。反り量が大きい場合にも、巻鉄心において、層を成す方向性電磁鋼板同士の間に比較的大きな隙間が生じ、この隙間によって振動音が大きくなったため、騒音特性は向上しなかったと考えられる。 Also, test no. 8, the transformer manufactured using the grain-oriented electrical steel sheet with a warp of 31 mm had a sound pressure of 67.0 dB, and was tested No. 8. The amount of change in sound pressure with respect to 1 was 1.9 dB, and the effect of improving noise characteristics was not obtained. Even when the amount of warpage was large, relatively large gaps were generated between the layered grain-oriented electrical steel sheets in the wound core, and the gaps increased the vibration noise.

(実施例2)
続いて、一方の面にレーザーを照射して熱ひずみを導入した方向性電磁鋼板を製造し、騒音特性を評価した。詳細には、板厚が0.23mmまたは0.27mmの二次焼鈍工程後の鋼板を複数用意し、表2に示す焼鈍温度及び通板張力で焼鈍を行った後、表2に示す目付量でコロイダルシリカ及びリン酸塩を含有するコーティング液を塗布し、熱処理を行った。焼鈍時間と、コーティング液塗布後の熱処理は、実施例1と同様の条件とした。その後、厚目付面の圧延方向に垂直になる線方向にレーザーを照射して熱ひずみを導入した。製造された方向性電磁鋼板の反り量は、実施例1と同様にして測定した。
(Example 2)
Subsequently, a grain-oriented electrical steel sheet was manufactured by irradiating one surface with a laser to introduce thermal strain, and noise characteristics were evaluated. Specifically, a plurality of steel sheets having a thickness of 0.23 mm or 0.27 mm after the secondary annealing process were prepared, and after annealing at the annealing temperature and sheet threading tension shown in Table 2, the basis weight shown in Table 2 was obtained. A coating liquid containing colloidal silica and a phosphate was applied in and heat-treated. Annealing time and heat treatment after application of the coating liquid were the same conditions as in Example 1. After that, a laser was irradiated in a line direction perpendicular to the rolling direction of the thickened surface to introduce thermal strain. The amount of warpage of the produced grain-oriented electrical steel sheets was measured in the same manner as in Example 1.

実施例1と同様にして、製造された方向性電磁鋼板を用いて容量が750kVAの変圧器を製造し、音圧を測定した。 A transformer with a capacity of 750 kVA was manufactured using the manufactured grain-oriented electrical steel sheets in the same manner as in Example 1, and the sound pressure was measured.

表1に、各方向性電磁鋼板の製造条件、反り量、及び騒音測定の結果を示す。 Table 1 shows the manufacturing conditions, warpage amounts, and noise measurement results of each grain-oriented electrical steel sheet.

Figure 0007299464000002
Figure 0007299464000002

試験No.11及び試験No.12は、評価の基準である。試験No.11は、板厚が0.23mmの方向性電磁鋼板を用いて、変圧器を作製した例である。試験No.11及び試験No.12は、熱ひずみを導入したことにより、それぞれ1mmおよび0.5mmの反りが生じた。試験No.11の音圧は、71.0dBであった。試験No.12は、板厚が0.27mmであり、反り量が0mmの方向性電磁鋼板を用いて、変圧器を作製した例である。試験No.12の音圧は、69.8dBであった。 Test no. 11 and test no. 12 is the standard of evaluation. Test no. 11 is an example in which a transformer is manufactured using a grain-oriented electrical steel sheet with a plate thickness of 0.23 mm. Test no. 11 and test no. No. 12 had warpage of 1 mm and 0.5 mm, respectively, due to the introduction of thermal strain. Test no. 11 sound pressure was 71.0 dB. Test no. 12 is an example in which a transformer is manufactured using a grain-oriented electrical steel sheet having a plate thickness of 0.27 mm and a warp amount of 0 mm. Test no. 12 sound pressure was 69.8 dB.

試験No.13では、反り量が13mmであり、この方向性電磁鋼板を用いて製造された変圧器の音圧は、67.9dBとなり、試験No.11と比較して、騒音特性が向上した。試験No.14では、反り量が18mmであり、この方向性電磁鋼板を用いて製造された変圧器の音圧は、63.2dBとなり、試験No.11と比較して、騒音特性が向上した。試験No.15では、反り量が22mmであり、この方向性電磁鋼板を用いて製造された変圧器の音圧は、59.7dBとなり、試験No.11と比較して、騒音特性が向上した。また、試験No.16は、反り量が21mmであり、この方向性電磁鋼板を用いて製造された変圧器の音圧は、58.7dBとなり、試験No.12と比較して、騒音特性が向上した。 Test no. In Test No. 13, the amount of warp was 13 mm, and the sound pressure of the transformer manufactured using this grain-oriented electrical steel sheet was 67.9 dB. Compared to 11, the noise characteristics were improved. Test no. In Test No. 14, the amount of warp was 18 mm, and the sound pressure of the transformer manufactured using this grain-oriented electrical steel sheet was 63.2 dB. Compared to 11, the noise characteristics were improved. Test no. In Test No. 15, the amount of warp was 22 mm, and the sound pressure of the transformer manufactured using this grain-oriented electrical steel sheet was 59.7 dB. Compared to 11, the noise characteristics were improved. Also, test no. In Test No. 16, the amount of warp was 21 mm, and the sound pressure of the transformer manufactured using this grain-oriented electrical steel sheet was 58.7 dB. Compared to 12, the noise characteristics were improved.

一方で、試験No.17~試験No.19に示すように、反り量が13mm未満の方向性電磁鋼板を用いて製造された変圧器では、試験No.11に対する音圧の変化量が3dB未満であり、騒音特性の向上効果は得られなかった。これらの方向性電磁鋼板で製造された巻鉄心において、層を成す方向性電磁鋼板同士の間に比較的大きな隙間が生じ、この隙間によって振動音が大きくなったため、騒音特性は向上しなかったと考えられる。 On the other hand, Test No. 17 to Test No. 19, the transformer manufactured using the grain-oriented electrical steel sheet with a warpage amount of less than 13 mm was tested in test No. 19. The amount of change in sound pressure with respect to 11 was less than 3 dB, and no improvement in noise characteristics was obtained. In wound cores manufactured with these grain-oriented electrical steel sheets, a relatively large gap was generated between layers of grain-oriented electrical steel sheets, and this gap increased the vibration noise, so it is thought that the noise characteristics did not improve. be done.

また、試験No.20に示すように、反り量が35mmの方向性電磁鋼板を用いて製造された変圧器では、音圧は70.2dBであり、試験No.11に対する音圧の変化量が0.8dBであり、騒音特性の向上効果は得られなかった。反り量が大きい場合にも、巻鉄心において、層を成す方向性電磁鋼板同士の間に比較的大きな隙間が生じ、この隙間によって振動音が大きくなったため、騒音特性は向上しなかったと考えられる。 Also, test no. 20, the transformer manufactured using the grain-oriented electrical steel sheet with a warp of 35 mm had a sound pressure of 70.2 dB, and test No. The amount of change in sound pressure with respect to 11 was 0.8 dB, and the effect of improving noise characteristics was not obtained. Even when the amount of warpage was large, relatively large gaps were generated between the layered grain-oriented electrical steel sheets in the wound core, and the gaps increased the vibration noise.

(実施例3)
続いて、一方の面に溝が形成された方向性電磁鋼板を製造し、騒音特性を評価した。詳細には、板厚が0.23mmの二次焼鈍工程後の鋼板を複数用意し、表3に示す焼鈍温度及び通板張力で焼鈍を行った後、表3に示す目付量でコロイダルシリカ及びリン酸塩を含有するコーティング液を塗布し、熱処理を行った。焼鈍時間と、コーティング液塗布後の熱処理は、実施例1と同様の条件とした。その後、鋼板に荷重をかけて、厚目付面の圧延方向に垂直になる線方向に溝を形成した。製造された方向性電磁鋼板の反り量は、実施例1と同様にして測定した。
(Example 3)
Subsequently, a grain-oriented electrical steel sheet having grooves formed on one surface was manufactured, and noise characteristics were evaluated. Specifically, a plurality of steel sheets having a thickness of 0.23 mm after the secondary annealing process were prepared, annealed at the annealing temperature and sheet tension shown in Table 3, and then colloidal silica and A coating liquid containing phosphate was applied and heat-treated. Annealing time and heat treatment after application of the coating liquid were the same conditions as in Example 1. After that, a load was applied to the steel sheet to form grooves in the line direction perpendicular to the rolling direction of the thickened surface. The amount of warpage of the produced grain-oriented electrical steel sheets was measured in the same manner as in Example 1.

実施例1と同様にして、製造された方向性電磁鋼板を用いて容量が750kVAの変圧器を製造し、音圧を測定した。 A transformer with a capacity of 750 kVA was manufactured using the manufactured grain-oriented electrical steel sheets in the same manner as in Example 1, and the sound pressure was measured.

表3に、各方向性電磁鋼板の製造条件、反り量、及び騒音測定の結果を示す。 Table 3 shows the manufacturing conditions, warpage amounts, and noise measurement results of each grain-oriented electrical steel sheet.

Figure 0007299464000003
Figure 0007299464000003

試験No.21は、評価の基準である。試験No.21は、反り量が0.5mmの方向性電磁鋼板を用いて、変圧器を作製した例である。試験No.21は、溝を形成させたことにより、0.5mmの反りが生じた。試験No.21の音圧は、68.1dBであった。 Test no. 21 is the standard of evaluation. Test no. 21 is an example in which a transformer is manufactured using a grain-oriented electrical steel sheet with a warp amount of 0.5 mm. Test no. No. 21 had a warp of 0.5 mm due to the formation of grooves. Test no. The sound pressure of 21 was 68.1 dB.

試験No.22では、反り量が13mmであり、この方向性電磁鋼板を用いて製造された変圧器の音圧は、64.8dBとなり、試験No.21と比較して、騒音特性が向上した。試験No.23では、反り量が16mmであり、この方向性電磁鋼板を用いて製造された変圧器の音圧は、60.1dBとなり、試験No.21と比較して、騒音特性が向上した。試験No.24では、反り量が21mmであり、この方向性電磁鋼板を用いて製造された変圧器の音圧は、57.3dBとなり、試験No.21と比較して、騒音特性が向上した。 Test no. In Test No. 22, the amount of warp was 13 mm, and the sound pressure of the transformer manufactured using this grain-oriented electrical steel sheet was 64.8 dB. Compared to 21, the noise characteristics were improved. Test no. In Test No. 23, the amount of warp was 16 mm, and the sound pressure of the transformer manufactured using this grain-oriented electrical steel sheet was 60.1 dB. Compared to 21, the noise characteristics were improved. Test no. In Test No. 24, the amount of warp was 21 mm, and the sound pressure of the transformer manufactured using this grain-oriented electrical steel sheet was 57.3 dB. Compared to 21, the noise characteristics were improved.

一方で、試験No.25~試験No.27に示すように、反り量が13mm未満の方向性電磁鋼板を用いて製造された変圧器では、音圧の変化量が3dB未満であり、騒音特性の向上効果は得られなかった。これらの方向性電磁鋼板で製造された巻鉄心において、層を成す方向性電磁鋼板同士の間に比較的大きな隙間が生じ、この隙間によって振動音が大きくなったため、騒音特性は向上しなかったと考えられる。 On the other hand, Test No. 25 to Test No. 27, the transformer manufactured using grain-oriented electrical steel sheets with a warp of less than 13 mm had a change in sound pressure of less than 3 dB, and no improvement in noise characteristics was obtained. In wound cores manufactured with these grain-oriented electrical steel sheets, a relatively large gap was generated between layers of grain-oriented electrical steel sheets, and this gap increased the vibration noise, so it is thought that the noise characteristics did not improve. be done.

また、試験No.28に示すように、反り量が32mmの方向性電磁鋼板を用いて製造された変圧器では、音圧の変化量が0.6dBであり、騒音特性の向上効果は得られなかった。反り量が大きい場合にも、巻鉄心において、層を成す方向性電磁鋼板同士の間に比較的大きな隙間が生じ、この隙間によって振動音が大きくなったため、騒音特性は向上しなかったと考えられる。 Also, test no. As shown in Fig. 28, in the transformer manufactured using the grain-oriented electrical steel sheet with a warp amount of 32 mm, the amount of change in sound pressure was 0.6 dB, and the effect of improving noise characteristics was not obtained. Even when the amount of warpage was large, relatively large gaps were generated between the layered grain-oriented electrical steel sheets in the wound core, and the gaps increased the vibration noise.

以上、本発明によれば、騒音特性に優れた、方向性電磁鋼板、巻鉄心変圧器用方向性電磁鋼板、巻鉄心の製造方法及び巻鉄心変圧器の製造方法を提供することが可能となる。 As described above, according to the present invention, it is possible to provide a grain-oriented electrical steel sheet, a grain-oriented electrical steel sheet for a wound core transformer, a method for manufacturing a wound core, and a method for manufacturing a wound core transformer, which are excellent in noise characteristics.

以上、添付図面を参照しながら本発明の好適な実施形態について詳細に説明したが、本発明はかかる例に限定されない。本発明の属する技術の分野における通常の知識を有する者であれば、特許請求の範囲に記載された技術的思想の範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、これらについても、当然に本発明の技術的範囲に属するものと了解される。 Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention belongs can conceive of various modifications or modifications within the scope of the technical idea described in the claims. It is understood that these also naturally belong to the technical scope of the present invention.

1 巻鉄心変圧器
10 巻鉄心
20A 一次巻線
20B 二次巻線
100 方向性電磁鋼板
1 Wound core transformer 10 Wound core 20A Primary winding 20B Secondary winding 100 Grain-oriented electrical steel sheet

Claims (9)

圧延方向に280mmに切り出した鋼片を、圧延面内における圧延方向と垂直な方向が鉛直方向と一致するように前記鋼片の圧延方向の一端を圧延方向に沿って30mm固定した際に、前記鋼片の圧延方向の他端における板厚方向の変位量が13mm以上30mm未満である反りを有し、
巻鉄心変圧器に用いられる、巻鉄心変圧器用方向性電磁鋼板。
A steel slab cut to 280 mm in the rolling direction is fixed at one end in the rolling direction by 30 mm along the rolling direction so that the direction perpendicular to the rolling direction in the rolling plane coincides with the vertical direction. The billet has a warp in which the amount of displacement in the plate thickness direction at the other end in the rolling direction is 13 mm or more and less than 30 mm,
A grain-oriented electrical steel sheet for wound core transformers.
圧延方向に280mmに切り出した鋼片を、圧延面内における圧延方向と垂直な方向が鉛直方向と一致するように前記鋼片の圧延方向の一端を圧延方向に沿って30mm固定した際に、前記鋼片の圧延方向の他端における板厚方向の変位量が13mm以上30mm未満である反りを有し、 A steel slab cut to 280 mm in the rolling direction is fixed at one end in the rolling direction by 30 mm along the rolling direction so that the direction perpendicular to the rolling direction in the rolling plane coincides with the vertical direction. The billet has a warp in which the amount of displacement in the plate thickness direction at the other end in the rolling direction is 13 mm or more and less than 30 mm,
一方の面に、溝加工が施されている、方向性電磁鋼板。 A grain-oriented electrical steel sheet with grooves on one side.
圧延方向に280mmに切り出した鋼片を、圧延面内における圧延方向と垂直な方向が鉛直方向と一致するように前記鋼片の圧延方向の一端を圧延方向に沿って30mm固定した際に、前記鋼片の圧延方向の他端における板厚方向の変位量が20mm以上30mm未満である反りを有する、方向性電磁鋼板。 A steel slab cut to 280 mm in the rolling direction is fixed at one end in the rolling direction by 30 mm along the rolling direction so that the direction perpendicular to the rolling direction in the rolling plane coincides with the vertical direction. A grain-oriented electrical steel sheet having a warp in which the amount of displacement in the plate thickness direction at the other end of the billet in the rolling direction is 20 mm or more and less than 30 mm. 一方の面に、線状の熱ひずみが導入されている、請求項1~3のいずれか1項に記載の方向性電磁鋼板。 The grain-oriented electrical steel sheet according to any one of claims 1 to 3 , wherein linear thermal strain is introduced on one surface. 板厚が、0.18mm以上0.35mm以下である、請求項1~のいずれか1項に記載の方向性電磁鋼板。 The grain-oriented electrical steel sheet according to any one of claims 1 to 4 , having a thickness of 0.18 mm or more and 0.35 mm or less. 請求項2~5のいずれか1項に記載の方向性電磁鋼板を、前記反りに沿って巻き回す工程を含む、巻鉄心の製造方法。 A method for manufacturing a wound core, comprising winding the grain-oriented electrical steel sheet according to any one of claims 2 to 5 along the warp. 請求項2~5のいずれか1項に記載の方向性電磁鋼板を、前記反りに沿って巻き回す工程を含む、巻鉄心変圧器の製造方法。 A method for manufacturing a wound core transformer, comprising winding the grain-oriented electrical steel sheet according to any one of claims 2 to 5 along the warp. 請求項1に記載の巻鉄心変圧器用方向性電磁鋼板を、前記反りに沿って巻き回す工程を含む、巻鉄心の製造方法。 A method for manufacturing a wound core, comprising winding the grain-oriented electrical steel sheet for a wound core transformer according to claim 1 along the warp. 請求項1に記載の巻鉄心変圧器用方向性電磁鋼板を、前記反りに沿って巻き回す工程を含む、巻鉄心変圧器の製造方法。 A method for manufacturing a wound core transformer, comprising the step of winding the grain-oriented electrical steel sheet for a wound core transformer according to claim 1 along the warp.
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