JP2004040057A - Annealed iron core and method of manufacturing iron core - Google Patents
Annealed iron core and method of manufacturing iron core Download PDFInfo
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Abstract
【課題】鉄損特性の優れた電動機モータ、トランス用鉄芯、特に電気ハイブリット自動車用に使用される電動機モータ、トランス用鉄芯を提供する。
【解決手段】電磁鋼板を所定の形状に打ち抜き調整後、積層、或いは巻いて鉄芯形状に成形、溶接、カシメ、ボルト締めの工程を経て固定され、焼鈍された鉄芯の電気抵抗値（Ωｍ×１０−８）とＬεとＣεの平均ヤング率の積が７０００〜１２０００の範囲であることを特徴とする焼鈍鉄芯であり、また、電磁鋼板を所定の形状に打ち抜き調整後、積層、或いは巻いて鉄芯形状に成形、溶接、カシメ、ボルト締めの工程を経て固定した鉄芯を焼鈍し、次いで該鉄芯を冷却速度；Ｖ≦０．６×（Ｌε＋Ｃε）／２（℃／ｈｒ）、好ましくは１００℃／ｈｒ以下で冷却することを特徴とする焼鈍鉄芯の製造方法（ただし、Ｌεは鋼板圧延方向のヤング率、Ｃεは鋼板圧延方向と直角方向のヤング率）。
【選択図】 図１Provided are an electric motor and an iron core for a transformer having excellent iron loss characteristics, particularly an electric motor and an iron core for a transformer used for an electric hybrid vehicle.
An electromagnetic steel sheet is punched into a predetermined shape, adjusted, laminated, or rolled, formed into an iron core shape, fixed through a process of welding, caulking, and bolting, and then subjected to an electrical resistance value (Ωm) of an annealed iron core. × 10 −8 ) and an average Young's modulus of Lε and Cε are in the range of 7000 to 12000, and furthermore, after the electromagnetic steel sheet is punched and adjusted to a predetermined shape, laminated, or The iron core fixed through a process of winding, forming into a core shape, welding, caulking, and bolting is annealed, and then the iron core is cooled at a cooling rate of V ≦ 0.6 × (Lε + Cε) / 2 (° C./hr). A method for producing an annealed iron core, which is preferably cooled at a temperature of 100 ° C./hr or less (where Lε is Young's modulus in the steel sheet rolling direction, and Cε is Young's modulus in a direction perpendicular to the steel sheet rolling direction).
[Selection diagram] Fig. 1
Description
【０００１】
【発明の属する技術分野】
本発明は、電動機モータ、トランス用鉄芯、特に電気ハイブリット自動車用に使用される電動機モータ、トランス用鉄芯に関する。
【０００２】
【従来の技術】
近年、省エネルギーの観点から各種電気機器、および電気ハイブリット自動車の効率向上が追求されている。特に、電気機器の効率は各種要因に影響されるが、モータやトランスの鉄芯で発生する損失である鉄損は比較的大きな比重を占めており、そのために、最近ではより鉄損の少ない電磁鋼板の使用が求められている。
【０００３】
このような電磁鋼板を用いてモータやトランス等の積層鉄芯を製造する方法としては、電磁鋼板を所望の鉄芯形状に打ち抜いた後、必要枚数を単位鉄芯として積層し、周囲をボルト締め、カシメ、溶接して固着して鉄芯とするのが一般的である。このようにして製造された積層鉄芯は、その性能を更に向上させるために、巻線コイルの組み立て工程前に焼鈍を施す。この焼鈍は、それまでに鉄芯に導入された打ち抜き、ボルト締め、カシメ、溶接等で加工歪みを除去し、かつ鉄芯を構成する電磁鋼板の結晶粒の粒径を適正化させるために行われ、これにより鉄芯としての性能向上を図るものである。その後、巻線コイルの組み立て工程を経て、最終的にモータやトランスの一部品として組み込まれる。
【０００４】
ところが、現実には、焼鈍により十分な熱を鉄芯に付与して、それまでに導入された打ち抜き、ボルト締め、カシメ、溶接等で加工歪みを除去したり、鉄芯を構成する電磁鋼板の結晶粒の粒径を適正化しても、鉄損特性が必ずしも改善されないという事態に直面している。
【０００５】
上記問題解決のために鉄芯の焼鈍方法について、様々な提案がなされている。例えば、特開昭５４−１８０３号公報では鉄芯を焼鈍後に接着する方法、特開昭６３−３９４４４号公報では真空中で、かつ還元雰囲気中で鉄芯を焼鈍後、プレス時に使用した油の炭化防止と絶縁皮膜の酸化劣化を防止する方法、特開平１１−２３４９７１号公報および特開平１１−２４３６７０号公報では８００℃以上の温度で水素およびアルゴン雰囲気中で鉄芯を焼鈍することによりＡｌＮの析出を防止する方法、特開２００１−３３８８２４号公報では積層接着鋼板の冷却速度を制御してコアの割れ、或いは皮膜剥離を防止する方法、および特開２００１−２９４９９９号公報ではＳｉ：４質量％以上の電磁鋼板の平坦度を制御してボルト締めした時の緩みを防止する方法が提案されている。
【０００６】
しかしながら、これら従来の方法においては、何れも焼鈍鉄芯の最終特性、特に鉄損値の改善効果を狙ったものでなく、このために本発明の目的である特に電気ハイブリット自動車用に使用される電動機モータ、トランス用鉄芯には適用できないという問題点がある。
【０００７】
【発明が解決しようとする課題】
本発明者らは、これらの問題の原因について種々検討したところ、焼鈍された鉄芯を個性する電磁鋼板のヤング率が磁気特性改善に大きく影響することを知見し、更に、このヤング率は焼鈍後の鉄芯の冷却速度に依存することを知見し、この冷却速度を鋼板の長手方向およびそれに直交する方向のヤング率に基づいて制御することで鉄芯のヤング率を高めることで、焼鈍後に大幅に鉄損が改善された焼鈍鉄芯を提供するものである。
【０００８】
【課題を解決するための手段】
本発明は、上記課題を解決するためになされたもので、その要旨は、電磁鋼板を所定の形状に打ち抜き調整後、積層、或いは巻いて鉄芯形状に成形、溶接、カシメ、ボルト締めの工程を経て固定され、焼鈍された鉄芯の電気抵抗値（Ωｍ×１０−８）とＬεとＣεの平均ヤング率の積が８０００〜１０５００の範囲であることを特徴とする焼鈍鉄芯であり、また、電磁鋼板を所定の形状に打ち抜き調整後、積層、或いは巻いて鉄芯形状に成形、溶接、カシメ、ボルト締めの工程を経て固定した鉄芯を焼鈍し、次いで該鉄芯を冷却速度：Ｖ≦０．６×（Ｌε＋Ｃε）／２（℃／ｈｒ）、好ましくは１００℃／ｈｒ以下で冷却することを特徴とする焼鈍鉄芯の製造方法である。
【０００９】
ただし、Ｌεは鋼板圧延方向のヤング率、Ｃεは鋼板圧延方向と直角方向のヤング率、である。
【００１０】
【発明の実施の形態】
先ず、本発明において使用される電磁鋼板は、方向性或いは無方向性電磁鋼板を使用することができる。この場合、これら電磁鋼板の鉄損特性は高磁束密度で、かつ低鉄損材であることが望ましい。すなわち、電気ハイブリット自動車用に使用されるモータやトランスでは局所的に磁束密度が２．０（Ｔ）近傍となり、しかも高速回転に対応した４００Ｈｚ以上という高周波駆動が要求される。それには上述したように素材自体が極めて磁気特性の優れたもので、かつ、強度のある電磁鋼板を使用する必要がある。このように、電気ハイブリット自動車用に使用されるモータやトランスでは小型化、軽量化された高出力モータが望まれている。
【００１１】
このような特性を有する電磁鋼板は、使用箇所の形状に応じて所定の形状に打ち抜かれた後、必要枚数を積層して積み鉄芯とするか、或いは巻いて巻き鉄芯の形状に成形される。次いで、この鉄芯は、必要箇所を溶接後、カシメまたはボルト締めでブロックにされる。次いで、この鉄芯は、その性能を更に向上させるために、巻線コイルの組み立て工程前に焼鈍を施こされる。この焼鈍は、それまでに鉄芯に導入された打ち抜き、ボルト締め、カシメ、溶接等で加工歪みを除去し、かつ鉄芯を構成する電磁鋼板の結晶粒の粒径を適正化させるために行われるもので、本発明においては、約７００〜８５０℃で１〜３時間均熱の焼鈍処理が行われる。この鉄芯焼鈍処理においては、焼鈍炉の定盤上に鉄芯を載置して焼鈍する。
【００１２】
本発明者らは、方向性或いは無方向性電磁鋼板が鉄芯製造過程において、鉄芯に導入された打ち抜き、ボルト締め、カシメ、溶接等で加工歪みの感受性がヤング率とは反比例することを知見した。一般的に鉄損は電気抵抗に反比例し、ヤング率とは比例するため、加工によって得られる鉄芯の鉄損値を低くするには最適条件があることが判明した。そこで本発明者らは、電気抵抗値とＬεとＣεの平均ヤング率の積が８０００〜１０５００の範囲であることを見い出した。上記積の下限値が８０００以下では鉄損が悪化し、また、上記積の上限値１０５００以上では加工性が劣化する。なお、固有抵抗（ｙ：μΩ−ｃｍ）は鋼板中に含有する成分との関係式（ｙ＝１０．４５＋１３．２Ｓｉ＋１１．３Ａｌ＋４５Ｍｎ＋１３．７Ｐ＋６Ｃｒ）で表される。
【００１３】
本発明者らは、更に、低鉄損を得るために種々検討したところ、鉄芯焼鈍工程において、焼鈍後の鉄芯の冷却速度がヤング率εと特定の関係にあることを見い出した。すなわち、図１に示すように、鉄芯の焼鈍後の冷却速度をＶ≦０．６×（Ｌε＋Ｃε）／２、（ただし、Ｌεは鋼板圧延方向のヤング率、Ｃεは鋼板圧延方向と直角方向のヤング率）とヤング率とは密接な関係にあるとよい。すなわち、図２に示すように、冷却速度を約１００℃／ｈｒ以下に制御して冷却することで鉄損改善率を２０％以上改善することができる。
【００１４】
【実施例】
〈実施例１〉
電気抵抗値とヤング率の異なる０．３５ｍｍの無方向性電磁鋼板を、外径：１２０ｍｍφ、内径：８０ｍｍφに打抜き、積層後、外周部を１２０°間隔でＴＩＧ溶接して鉄芯を製作した。次いで、還元雰囲気で７５０℃×２時間の均熱焼鈍を行い、引続き１４０℃／ｈの冷却速度で冷却を施した。その後コアパック部に巻線を施して磁気測定に供した。その結果を表１に示した。
【００１５】
【表１】
表１から分かるように、電気抵抗値とＬεとＣεの平均ヤング率の積が８０００〜１０５００（Ωｍ×１０−８・ＭＰａ）の範囲の場合、鉄損特性が優れていることがわかる。
【００１７】
〈実施例２〉
質量％で、Ｓｉ：３．０％、Ａｌ：０．０３％含有する０．３５ｍｍ厚の無向性電磁鋼板を、外径：６０ｍｍφ、内径：３５ｍｍφ、コアバック幅６ｍｍ、ティース幅３ｍｍ、スロット数２０のモータコア形状に打ち抜き、カシメを実施後、還元性雰囲気で７５０℃×２時間の均熱後、様々な冷却速度でＶで冷却し、種々の温度で脱炉した。このときのヤング率は（Ｌε＋Ｃε）／２＝１８５であった。その後コアバック部に巻線を施して鉄損測定を行った。なお、焼鈍前の鉄損値Ｗ１０／４００は１５．９Ｗ／ｋｇ、平均粒径は焼鈍前後ともに１５０μｍであった。この結果を表２に示した。
【００１８】
【表２】
表２から分かるように、鉄芯焼鈍後の冷却速度を１１１℃／ｈｒ以下で冷却することで、鉄損値（Ｗ１０／４００：Ｗ／ｋｇ）を大幅に改善されることが分かる。
【００２０】
【発明の効果】
以上述べたように、本発明は、鉄損特性の優れた電動機モータ、トランス用鉄芯、特に電気ハイブリット自動車用に使用される電動機モータ、トランス用鉄芯を提供可能となる。
【図面の簡単な説明】
【図１】鉄芯ヤング率と鉄芯焼鈍後の冷却速度との関係を示す図。
【図２】鉄芯焼鈍後の冷却速度と鉄損改善率との関係を示す図。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric motor and an iron core for a transformer, and particularly to an electric motor and an iron core for a transformer used for an electric hybrid vehicle.
[0002]
[Prior art]
BACKGROUND ART In recent years, from the viewpoint of energy saving, various electric devices and electric hybrid vehicles have been pursued with improved efficiency. In particular, the efficiency of electrical equipment is affected by various factors, but iron loss, which is a loss generated in the iron core of motors and transformers, occupies a relatively large specific gravity. The use of steel sheets is required.
[0003]
As a method of manufacturing a laminated iron core such as a motor or a transformer using such an electromagnetic steel sheet, after punching out an electromagnetic steel sheet into a desired iron core shape, the required number of sheets are laminated as a unit iron core, and the periphery is bolted around. It is common to caulk, weld, and fix to form an iron core. The laminated iron core manufactured as described above is annealed before the winding coil assembling process in order to further improve its performance. This annealing is performed in order to remove the processing distortion by punching, bolting, caulking, welding, etc. introduced into the iron core, and to optimize the grain size of the magnetic steel sheet constituting the iron core. Thus, the performance of the iron core is improved. After that, through a winding coil assembling process, it is finally assembled as a part of a motor or a transformer.
[0004]
However, in reality, sufficient heat is given to the iron core by annealing to remove the processing distortion by punching, bolting, caulking, welding, etc. introduced up to that time, or of the electromagnetic steel sheet constituting the iron core. There is a situation where iron loss characteristics are not always improved even if the grain size of the crystal grains is optimized.
[0005]
Various proposals have been made on a method of annealing an iron core to solve the above problem. For example, Japanese Patent Application Laid-Open No. 54-1803 discloses a method of bonding an iron core after annealing, and Japanese Patent Application Laid-Open No. 63-39444 discloses a method in which an iron core is annealed in a vacuum and in a reducing atmosphere. A method for preventing carbonization and preventing oxidative deterioration of an insulating film is disclosed in JP-A-11-234971 and JP-A-11-243670, by annealing an AlN by annealing an iron core in a hydrogen and argon atmosphere at a temperature of 800 ° C. or more. JP-A-2001-338824 discloses a method for preventing precipitation, a method for controlling the cooling rate of a laminated adhesive steel sheet to prevent core cracking or film peeling, and JP-A-2001-294999 discloses Si: 4% by mass. There has been proposed a method of controlling the flatness of the magnetic steel sheet to prevent loosening when bolted.
[0006]
However, none of these conventional methods is aimed at improving the final properties of the annealed iron core, particularly the iron loss value, and is therefore used for electric hybrid vehicles, which is the object of the present invention. There is a problem that it cannot be applied to electric motors and iron cores for transformers.
[0007]
[Problems to be solved by the invention]
The present inventors have conducted various studies on the causes of these problems, and found that the Young's modulus of an electrical steel sheet having an individualized annealed iron core greatly affects the improvement of magnetic properties. After knowing that it depends on the cooling rate of the iron core after, by increasing the Young's modulus of the iron core by controlling this cooling rate based on the Young's modulus in the longitudinal direction of the steel sheet and the direction orthogonal thereto, after annealing An object of the present invention is to provide an annealed iron core having significantly improved iron loss.
[0008]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-mentioned problems. The gist of the present invention is to form a steel core shape by laminating or winding an electromagnetic steel sheet after adjusting the punching into a predetermined shape, welding, caulking, and bolting steps. A product of the electric resistance value (Ωm × 10 −8 ) of the annealed iron core and the average Young's modulus of Lε and Cε is in the range of 8000 to 10500, Also, after the electromagnetic steel sheet is punched into a predetermined shape and adjusted, the iron core fixed through lamination or winding into an iron core shape, welding, caulking, and bolting processes is annealed, and then the iron core is cooled at a cooling rate of: A method for producing an annealed iron core, characterized by cooling at V ≦ 0.6 × (Lε + Cε) / 2 (° C./hr), preferably 100 ° C./hr or less.
[0009]
Here, Lε is the Young's modulus in the steel sheet rolling direction, and Cε is the Young's modulus in the direction perpendicular to the steel sheet rolling direction.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
First, as the electrical steel sheet used in the present invention, a grain-oriented or non-oriented electrical steel sheet can be used. In this case, the iron loss characteristics of these magnetic steel sheets are desirably high magnetic flux density and low iron loss material. That is, in a motor or a transformer used for an electric hybrid vehicle, a magnetic flux density locally becomes close to 2.0 (T), and high-frequency driving of 400 Hz or more corresponding to high-speed rotation is required. For this purpose, as described above, it is necessary to use a magnetic steel sheet which has extremely excellent magnetic properties and has high strength. As described above, there is a demand for a small-sized and light-weight high-output motor or transformer used for an electric hybrid vehicle.
[0011]
The magnetic steel sheet having such characteristics is punched into a predetermined shape according to the shape of the place to be used, and then laminated in a required number to form a stacked iron core, or wound and formed into a wound iron core shape. You. Next, this iron core is made into a block by caulking or bolting after welding necessary portions. The iron core is then annealed before the winding coil assembly process to further improve its performance. This annealing is performed in order to remove the processing distortion by punching, bolting, caulking, welding, etc. introduced into the iron core, and to optimize the grain size of the magnetic steel sheet constituting the iron core. In the present invention, the annealing treatment is performed at a temperature of about 700 to 850 ° C. for 1 to 3 hours. In this iron core annealing treatment, an iron core is placed on a surface plate of an annealing furnace and annealed.
[0012]
The inventors of the present invention have determined that the susceptibility of processing strain due to punching, bolting, caulking, welding, etc., of a grain-oriented or non-oriented electrical steel sheet in the course of manufacturing an iron core is inversely proportional to the Young's modulus. I learned. Generally, since iron loss is inversely proportional to electric resistance and proportional to Young's modulus, it has been found that there is an optimum condition for reducing the iron loss value of an iron core obtained by processing. Therefore, the present inventors have found that the product of the electric resistance value and the average Young's modulus of Lε and Cε is in the range of 8000 to 10500. When the lower limit of the above product is 8000 or less, iron loss is deteriorated, and when the upper limit of the above product is 10500 or more, workability is deteriorated. The specific resistance (y: μΩ-cm) is expressed by a relational expression (y = 10.45 + 13.2Si + 11.3Al + 45Mn + 13.7P + 6Cr) with the components contained in the steel sheet.
[0013]
The present inventors further conducted various studies in order to obtain low iron loss, and found that the cooling rate of the iron core after annealing had a specific relationship with the Young's modulus ε in the iron core annealing step. That is, as shown in FIG. 1, the cooling rate after annealing of the iron core is V ≦ 0.6 × (Lε + Cε) / 2, where Lε is the Young's modulus in the steel sheet rolling direction, and Cε is the direction perpendicular to the steel sheet rolling direction. It is preferable that the Young's modulus) and the Young's modulus have a close relationship. That is, as shown in FIG. 2, by controlling the cooling rate to about 100 ° C./hr or less for cooling, the iron loss improvement rate can be improved by 20% or more.
[0014]
【Example】
<Example 1>
A 0.35 mm non-oriented electrical steel sheet having an electrical resistance value and a Young's modulus different from each other was punched into an outer diameter: 120 mmφ and an inner diameter: 80 mmφ, and after lamination, the outer periphery was TIG-welded at 120 ° intervals to produce an iron core. Next, uniform heating annealing was performed at 750 ° C. for 2 hours in a reducing atmosphere, and then cooling was performed at a cooling rate of 140 ° C./h. Thereafter, a winding was applied to the core pack portion and subjected to magnetic measurement. The results are shown in Table 1.
[0015]
[Table 1]
As can be seen from Table 1, when the product of the electric resistance value and the average Young's modulus of Lε and Cε is in the range of 8000 to 10500 (Ωm × 10 −8 MPa), the iron loss characteristics are excellent.
[0017]
<Example 2>
A 0.35 mm thick omnidirectional electromagnetic steel sheet containing 3.0% by mass of Si and 0.03% by mass of Al, by mass%, has an outer diameter of 60 mm, an inner diameter of 35 mm, a core back width of 6 mm, a teeth width of 3 mm, and a slot. After punching into a motor core shape of several tens and performing caulking, it was soaked at 750 ° C. for 2 hours in a reducing atmosphere, cooled at various cooling rates with V, and defired at various temperatures. The Young's modulus at this time was (Lε + Cε) / 2 = 185. After that, the core back portion was wound and the core loss was measured. The iron loss value W10 / 400 before annealing was 15.9 W / kg, and the average particle size was 150 μm before and after annealing. The results are shown in Table 2.
[0018]
[Table 2]
As can be seen from Table 2, it is found that the iron loss value (W10 / 400: W / kg) can be significantly improved by cooling at a cooling rate of 111 ° C./hr or less after the iron core annealing.
[0020]
【The invention's effect】
As described above, the present invention can provide an electric motor and an iron core for a transformer having excellent iron loss characteristics, in particular, an electric motor used for an electric hybrid vehicle and an iron core for a transformer.
[Brief description of the drawings]
FIG. 1 is a diagram showing a relationship between an iron core Young's modulus and a cooling rate after iron core annealing.
FIG. 2 is a diagram showing a relationship between a cooling rate after iron core annealing and an iron loss improvement rate.
Claims (2)
（ただし、Ｌεは鋼板圧延方向のヤング率、Ｃεは鋼板圧延方向と直角方向のヤング率）The electrical resistance value (Ωm × 10 −8) of an annealed iron core that has been punched and adjusted into a predetermined shape after lamination or winding, formed into an iron core shape, fixed through a process of welding, caulking and bolting, and then fixed. ) And the product of the average Young's modulus of Lε and Cε is in the range of 8000 to 10500.
(However, Lε is Young's modulus in the steel sheet rolling direction, Cε is Young's modulus in the direction perpendicular to the steel sheet rolling direction)
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| JP2002198919A JP4028775B2 (en) | 2002-07-08 | 2002-07-08 | Annealed iron core manufacturing method |
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| JP2002198919A JP4028775B2 (en) | 2002-07-08 | 2002-07-08 | Annealed iron core manufacturing method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7078843B2 (en) | 2003-09-05 | 2006-07-18 | Black & Decker Inc. | Field assemblies and methods of making same |
| US7146706B2 (en) | 2003-09-05 | 2006-12-12 | Black & Decker Inc. | Method of making an electric motor |
| US7205696B2 (en) | 2003-09-05 | 2007-04-17 | Black & Decker Inc. | Field assemblies having pole pieces with ends that decrease in width, and methods of making same |
| US7211920B2 (en) | 2003-09-05 | 2007-05-01 | Black & Decker Inc. | Field assemblies having pole pieces with axial lengths less than an axial length of a back iron portion and methods of making same |
| US8207647B2 (en) | 2003-09-05 | 2012-06-26 | Black & Decker Inc. | Power tools with motor having a multi-piece stator |
| JP2021027711A (en) * | 2019-08-06 | 2021-02-22 | 日本製鉄株式会社 | Motor core |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5274803A (en) * | 1975-12-19 | 1977-06-23 | Hitachi Ltd | Manufacturing of rotary electric machine core |
| JPH04368103A (en) * | 1991-06-14 | 1992-12-21 | Nkk Corp | Low vibration magnetic core |
| JPH1025552A (en) * | 1996-07-10 | 1998-01-27 | Nippon Steel Corp | Non-oriented electrical steel sheet with excellent punching dimensional accuracy |
| JPH11234971A (en) * | 1998-02-10 | 1999-08-27 | Hiromichi Koshiishi | Core manufacturing method and low iron loss core |
| JP2000323318A (en) * | 1999-05-12 | 2000-11-24 | Kawasaki Steel Corp | Grain-oriented silicon steel sheet with low iron loss value |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5274803A (en) * | 1975-12-19 | 1977-06-23 | Hitachi Ltd | Manufacturing of rotary electric machine core |
| JPH04368103A (en) * | 1991-06-14 | 1992-12-21 | Nkk Corp | Low vibration magnetic core |
| JPH1025552A (en) * | 1996-07-10 | 1998-01-27 | Nippon Steel Corp | Non-oriented electrical steel sheet with excellent punching dimensional accuracy |
| JPH11234971A (en) * | 1998-02-10 | 1999-08-27 | Hiromichi Koshiishi | Core manufacturing method and low iron loss core |
| JP2000323318A (en) * | 1999-05-12 | 2000-11-24 | Kawasaki Steel Corp | Grain-oriented silicon steel sheet with low iron loss value |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7078843B2 (en) | 2003-09-05 | 2006-07-18 | Black & Decker Inc. | Field assemblies and methods of making same |
| US7146706B2 (en) | 2003-09-05 | 2006-12-12 | Black & Decker Inc. | Method of making an electric motor |
| US7205696B2 (en) | 2003-09-05 | 2007-04-17 | Black & Decker Inc. | Field assemblies having pole pieces with ends that decrease in width, and methods of making same |
| US7211920B2 (en) | 2003-09-05 | 2007-05-01 | Black & Decker Inc. | Field assemblies having pole pieces with axial lengths less than an axial length of a back iron portion and methods of making same |
| US7233091B2 (en) | 2003-09-05 | 2007-06-19 | Black & Decker Inc. | Electric motor with field assemblies having core pieces with mating features |
| US7528520B2 (en) | 2003-09-05 | 2009-05-05 | Black & Decker Inc. | Electric motor having a field assembly with slot insulation |
| US8207647B2 (en) | 2003-09-05 | 2012-06-26 | Black & Decker Inc. | Power tools with motor having a multi-piece stator |
| US8558420B2 (en) | 2003-09-05 | 2013-10-15 | Black & Decker Inc. | Power tool with motor having a multi-piece stator |
| JP2021027711A (en) * | 2019-08-06 | 2021-02-22 | 日本製鉄株式会社 | Motor core |
| JP7328522B2 (en) | 2019-08-06 | 2023-08-17 | 日本製鉄株式会社 | motor core |
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