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公开(公告)号：US20240242864A1
公开(公告)日：2024-07-18
申请号：US18562199
申请日：2022-04-27
IPC分类号： H01F1/147 , B23K26/50 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/60
CPC分类号： H01F1/14783 , B23K26/50 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/60 , C22C2202/02
摘要： Provided is a grain-oriented electrical steel sheet that achieves both low iron loss and low magnetostriction and has excellent transformer properties. The grain-oriented electrical steel sheet has a thermal strain-imparted region extending in a direction crossing the rolling direction, where the steel sheet has a closure domain inside the thermal strain-imparted region, the thermal strain-imparted region has maximum points of tensile strain on both outer sides in the rolling direction of the closure domain, and in a strain distribution in the rolling direction of the thermal strain-imparted region, the strain at both outer sides of the closure domain is tensile strain larger than the strain at the center between the maximum points.
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公开(公告)号：US20230178276A1
公开(公告)日：2023-06-08
申请号：US17998356
申请日：2021-03-04
IPC分类号： H01F1/16
CPC分类号： H01F1/16 , C22C2202/02 , C22C38/60
摘要： Provided is a linear groove formation pattern with which both an effect of reducing the building factor and a high magnetic flux density can be obtained. In a grain-oriented electrical steel sheet having a plurality of linear grooves extending in a direction crossing a rolling direction of the steel sheet on a surface of the steel sheet, a surface of the steel sheet between the linear grooves has a recessed defect that is recessed from the surface, a volume fraction of the recessed defect in the steel sheet is 0.0025 vol % or more and 0.01 vol % or less of a steel sheet without the recessed defect, and discontinuous portions that disrupt the extension of the linear grooves are provided at a frequency of 30 or more and 200 or less per square meter of the steel sheet.
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3.发明申请公开(公告)号：US20190312495A1
公开(公告)日：2019-10-10
申请号：US16335949
申请日：2017-08-22
发明人： Kunihiro SENDA , Masanori UESAKA , Yoshihiko ODA
摘要： A punch processing method for electrical steel sheets to manufacture core segments includes: stacking a plurality of electrical steel sheets; and punching out the plurality of electrical steel sheets in a stacked state simultaneously to manufacture the core segments, wherein in a case where the core segments are applied to a stator core in which a maximum magnetic flux density at a tooth portion is to be higher than a maximum magnetic flux density at a back yoke portion, degrees of Vickers hardness of an electrical steel sheet located second from a bottom side and above in the stacked state are set to 180 HV or higher, and 10 HV or higher than a value of degree of Vickers hardness of an electrical steel sheet located on the bottom side in the stacked state.
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公开(公告)号：US20240233991A1
公开(公告)日：2024-07-11
申请号：US18562217
申请日：2022-04-27
CPC分类号： H01F1/14775 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/60 , C22C2202/02
摘要： Provided is a grain-oriented electrical steel sheet that achieves both low iron loss and low magnetostriction and has excellent transformer properties. The grain-oriented electrical steel sheet has a thermal strain-imparted region extending linearly in a direction crossing the rolling direction, and in the strain distribution in the rolling direction of the thermal strain-imparted region, the strain at both ends of the thermal strain-imparted region is tensile strain larger than the strain at the center of the thermal strain-imparted region.
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公开(公告)号：US20220239202A1
公开(公告)日：2022-07-28
申请号：US17611781
申请日：2020-05-15
摘要： A method for manufacturing a motor core includes a step of manufacturing a motor core by performing melt-cutting on an electrical steel sheet using heat input from a surface, the electrical steel sheet having an average thermal conductivity in depth positions from the surface to one-third depth of a sheet thickness lower than a thermal conductivity in a middle position in a sheet thickness direction by 30% or greater.
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公开(公告)号：US20200283863A1
公开(公告)日：2020-09-10
申请号：US16648663
申请日：2018-09-25
IPC分类号： C21D8/12 , C21D9/46 , C21D6/00 , C22C38/60 , C22C38/16 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , H01F1/16
摘要： Further lower iron loss can be achieved in a grain-oriented electrical steel sheet including: a predetermined film mainly composed of forsterite on a front and back surfaces thereof; and a plurality of grooves on the front surface thereof, in which the plurality of grooves have an average depth of 6% or more of a thickness of the steel sheet and are spaced a distance of 1 mm to 15 mm from respective adjacent grooves, the steel sheet has a specific magnetic permeability μr15/50 of 35000 or more when subjected to alternating current magnetization at a frequency of 50 Hz and a maximum magnetic flux density of 1.5 T, and the steel sheet includes isolated parts having a presence frequency of 0.3/μm or less, the isolated parts being separated from a continuous part of the film in an interface between the steel sheet and the film in a cross section orthogonal to the rolling direction of the steel sheet.
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公开(公告)号：US20190099800A1
公开(公告)日：2019-04-04
申请号：US16082698
申请日：2017-03-07
发明人： Kunihiro SENDA , Masanori UESAKA , Yoshihiko ODA
IPC分类号： B21D43/09 , B21D28/02 , H02K15/02 , H01F41/02 , H01F27/245
摘要： A method of manufacturing a laminated iron core includes: inserting a plurality of electrical steel strips in a superposed state to feed rolls including a pair of upper and lower feed rolls that are driven by a drive device to feed the electrical steel strips in a superposed state into a die having a plurality of punching processes in sequence; joining a part or all of the superposed electrical steel strips together before entering the die or at an upstream stage portion of the die after feeding out the electrical steel strips from the pair of upper and lower feed rolls; and punching simultaneously the plurality of electrical steel strips in a superposed state in the die.
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公开(公告)号：US20220298599A1
公开(公告)日：2022-09-22
申请号：US17596584
申请日：2020-04-17
摘要： Provided is a grain-oriented electrical steel sheet that combines low iron loss and low magnetostriction, together with an advantageous production method therefor. A grain-oriented electrical steel sheet comprises a linear strain portion extending in a direction intersecting a rolling direction of the grain-oriented electrical steel sheet, wherein the linear strain portion has a stress distribution in which a compressive stress region and a tensile stress region alternate in a longitudinal direction of the linear strain portion. The linear strain portion is formed by vibrating the grain-oriented electrical steel sheet in a sheet thickness direction, while irradiating a surface of the grain-oriented electrical steel sheet with an electron beam by repeatedly moving and detaining the electron beam in the direction intersecting the rolling direction of the grain-oriented electrical steel sheet.
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公开(公告)号：US20200087746A1
公开(公告)日：2020-03-19
申请号：US16468087
申请日：2017-12-14
发明人： Takeshi OMURA , Hirotaka INOUE , Kunihiro SENDA , Seiji OKABE
IPC分类号： C21D9/46 , C22C38/60 , C22C38/44 , C22C38/34 , C22C38/04 , C22C38/00 , C21D8/12 , C21D8/00 , C21D6/00 , C21D3/04 , H01F1/147 , H01F27/245 , H01F41/02
摘要： Provided is a grain-oriented electrical steel sheet having better transformer iron loss property than conventional grain-oriented electrical steel sheets. A grain-oriented electrical steel sheet comprises: a steel substrate; a forsterite film on a surface of the steel substrate; and a Cr-depleted layer at a boundary between the steel substrate and the forsterite film, the Cr-depleted layer having a Cr concentration that is 0.70 times to 0.90 times a Cr concentration of the steel substrate.
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公开(公告)号：US20180037966A1
公开(公告)日：2018-02-08
申请号：US15549578
申请日：2015-02-13
CPC分类号： C21D9/46 , C21D6/005 , C21D6/008 , C21D8/1222 , C21D8/1233 , C21D8/1238 , C21D8/1266 , C21D8/1272 , C21D8/1283 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/004 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/34 , C22C38/60 , H01F1/16
摘要： A grain-oriented electrical steel sheet having a composition containing, in mass %, C: 0.005% or less, Si: 2.0% to 4.5%, and Mn: 0.5% or less, and also containing Sb and P in respective ranges satisfying 0.01%≦[% Sb]≦0.20% and 0.02%≦[% P]≦2.0×[% Sb], with a balance being Fe and incidental impurities, wherein when the steel sheet is excited to 1.0 T at 50 Hz in a rolling transverse direction, a magnetizing force (TD-H10) and an iron loss (TD-W10) are respectively (TD-H10)≧200 A/m and (TD-W10)≧1.60 W/kg. Thus, a grain-oriented electrical steel sheet having excellent transformer core loss can be obtained industrially stably at low cost.
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