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公开(公告)号：US11866796B2
公开(公告)日：2024-01-09
申请号：US17596584
申请日：2020-04-17
CPC分类号： C21D10/005 , H01F1/16 , C21D2201/05
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：US20220275487A1
公开(公告)日：2022-09-01
申请号：US17629863
申请日：2020-07-03
发明人： Yoshihisa Ichihara , Takeshi Omura , Hirotaka Inoue , Shigehiro Takajo , Masanori Odachi , Kunihiro Senda
摘要： A grain-oriented electrical steel sheet having linear grooves formed cyclically in a rolling direction of the grain-oriented electrical steel sheet such that a longitudinal direction of the linear grooves intersects the rolling direction, in which each of the linear grooves has a discontinuous portion of center lines where center lines of the groove are shifted in a groove width direction, and when a width of the linear groove is defined as a and a distance in the groove width direction between the center lines in the discontinuous portion of center lines is defined as b, a and b satisfy relational expression (1) below. 0.05≤b/a≤0.95 (1)
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3.发明授权公开(公告)号：US11005345B2
公开(公告)日：2021-05-11
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：US20180350518A1
公开(公告)日：2018-12-06
申请号：US15756775
申请日：2016-08-22
摘要： A laminated core manufacturing device includes: an overlapping unit configured to overlap the plurality of laminated core materials conveyed along different conveyance routes; an edge position correction unit configured to align edge positions in a width direction of the plurality of laminated core materials between the plurality of laminated core materials and to correct shift of each edge position of the plurality of laminated core materials with respect to a standard edge position; an uplift prevention unit configured to prevent uplift of the plurality of laminated core materials; and a punching unit configured to punch out the plurality of laminated core materials which are overlapped by the overlapping unit and have been subjected to a process to align the edge positions and to correct shift of the edge positions performed by the edge position correction unit, and a process to prevent the uplift performed by the uplift prevention unit.
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公开(公告)号：US11117181B2
公开(公告)日：2021-09-14
申请号：US16082698
申请日：2017-03-07
发明人： Kunihiro Senda , Masanori Uesaka , Yoshihiko Oda
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：US20210125759A1
公开(公告)日：2021-04-29
申请号：US17054605
申请日：2019-03-20
IPC分类号： H01F1/147 , C22C38/04 , C22C38/02 , C22C38/06 , C22C38/00 , C21D9/46 , C21D8/12 , C21D6/00 , H02K1/02
摘要： A motor comprising a steel sheet used as a core material of the motor, wherein the steel sheet includes a composition including: by mass %, 0.010% or less of C; 2.0% to 7.0% of Si; 2.0% or less of Al; 0.05% to 1.0% of Mn; 0.005% or less of S; 0.005% or less of N; and balance Fe and inevitable impurities; the steel sheet includes a magnetic flux density changing area where a change ΔB in magnetic flux density to a change ΔH=50 A/m in a magnetic field, is equal to or higher than 0.50 T; a thickness of the steel sheet is 0.05 mm to 0.20 mm; and an eddy-current loss of the steel sheet, at 1000 Hz−1.0 T, is equal to or less than 0.55 of a total iron loss.
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公开(公告)号：US10927430B2
公开(公告)日：2021-02-23
申请号：US15538459
申请日：2015-10-13
发明人： Masanori Uesaka , Kunihiro Senda , Yoshihiko Oda
摘要： A material for laminated iron cores is used as plural steel sheets to be overlapped with one another and punched when a laminated iron core is manufactured. A surface roughness of the steel sheets forming the material for laminated iron cores is at an arithmetic mean roughness Ra of 0.40 [μm] or less, and a sheet thickness deviation in a sheet width direction of at least a portion used as the laminated iron core is 3 [μm] or less per 500 [mm], the portion being of the steel sheets forming the material for laminated iron cores.
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公开(公告)号：US09617615B2
公开(公告)日：2017-04-11
申请号：US15022710
申请日：2014-08-26
发明人： Kunihiro Senda , Shigehiro Takajo , Tomoyuki Okubo
CPC分类号： C21D8/1244 , C21D6/005 , C21D6/008 , C21D8/12 , C21D8/1233 , C21D8/125 , C21D8/1261 , C21D8/1266 , C21D8/1272 , C21D8/1277 , C21D8/1283 , C21D8/1288 , C21D9/46 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/60 , H01F1/16
摘要： Provided is a grain-oriented electrical steel sheet including: a forsterite base film formed on a surface of the steel sheet; and an insulating tension coating formed on the base film, in which when Ti intensity FX(Ti), Al intensity FX(Al), and Fe intensity FX(Fe) obtained through quantitative analysis by performing fluorescent X-ray analysis on the surface of the steel sheet satisfy FX(Ti)/FX(Al)≧0.15 and FX(Ti)/FX(Fe)≧0.004, the frequency of crystal boundaries of secondary recrystallized grains in the direction orthogonal to the rolling direction is 20 grain boundaries/100 mm or less, the mean thickness of the forsterite base film t(Fo) and the thickness of the insulating tension coating t(C) satisfies t(Fo)/t(C)≧0.3, and magnetic domain refining treatment is performed by irradiation with a laser beam, plasma flame, or electron beam, a sufficient iron loss reducing effect is achieved in a range where coating detachment does not occur.
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公开(公告)号：US20230395301A1
公开(公告)日：2023-12-07
申请号：US18032424
申请日：2021-09-02
发明人： Takeshi Omura , Hirotaka Inoue , Kunihiro Senda
IPC分类号： H01F27/245
CPC分类号： H01F27/2455
摘要： Provided is a wound core having a flat portion and corner portions adjacent to the flat portion, the flat portion including a lap portion, the corner portions including bent portions. A non-heat-resistant magnetic domain refined material is used for at least a part of the materials forming the wound core. Closure domains are formed in the non-heat-resistant magnetic domain refined material so as to extend in a direction intersecting a longitudinal direction of the non-heat-resistant magnetic domain refined material, an area of each of the closure domains in a cross section that is taken in the longitudinal direction being more than 7500 μm2. In the lap portion, the ratio of the number of lap joint portions having a lap length of from 3.0 mm to 30 mm to the total number of lap joint portions is 50% or more.
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公开(公告)号：US11566302B2
公开(公告)日：2023-01-31
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 , C21D3/04 , C21D6/00 , C21D8/00 , C21D8/12 , C22C38/00 , C22C38/04 , C22C38/34 , H01F1/147 , H01F27/245 , C22C38/02 , C22C38/18 , C22C38/44 , C22C38/60 , 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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