Hitachi Metals, Ltd.

Sharp Kabushiki Kaisha Corporation

Proterial, Ltd.

Metglas, Inc.

Hitachi, Ltd.

Motoki Ohta

Yoshihito Yoshizawa

Hirokazu Nakamura

Tetsuro Kato

Kousuke Namisaki

Nobuhiko Chiwata

Naoki Ito

Hajime Itagaki

Makoto Sasaki

Toshio Abe

Mamoru Kimura

Shin Takahashi

Shin Noguchi

Takashi Nakabayashi

Tatsuya Shinkawa

Morifumi Kuroki

Yuichi Ogawa

Kota Yoshikawa

Takahiro Shiratake

Naoki Itoh

Hirohisa Sano

Kyohei Aimuta

Shuji Yamanaka

The stator for a rotating electrical machine includes an annular first iron core part, which is a stacked body including electrical steel plates, and second iron core part, which is a stacked body including an amorphous soft magnetic metal or a nanocrystalline soft magnetic metal, wherein: the annular first iron core part includes a plurality of tooth parts which protrude toward the inner circumferential side and around which a coil is wound, and first groove parts formed within each tooth part from an outer circumferential surface; and the second iron core parts are disposed in the first groove parts.

Stator for rotating electrical machine, rotating electrical machine, method for manufacturing stator for rotating electrical machine, and method for manufacturing rotating electrical machine

A magnetic core powder including granular powder A of Fe-based, magnetic, crystalline metal material and granular powder B of Fe-based, magnetic, amorphous metal material; the particle size d50A of granular powder A at a cumulative frequency of 50 volume % being 0.5 μm or more and 7.0 μm or less, and the particle size d50B of granular powder B at a cumulative frequency of 50 volume % being more than 15.0 μm, in a cumulative distribution curve showing the relation between particle size and cumulative frequency from the smaller particle size side, determined by a laser diffraction method; the magnetic core powder meeting (d90M−d10M)/d50M of 1.6 or more and 6.0 or less, d10M being a particle size at a cumulative frequency of 10 volume %, d50M being a particle size at a cumulative frequency of 50 volume %, and d90M being a particle size at a cumulative frequency of 90 volume %.

Magnetic core powder, magnetic core and coil device using it, and method for producing magnetic core powder

One aspect of the invention provides an Fe-based amorphous alloy ribbon having a free solidified surface and a roll contact surface, in which the Fe-based amorphous alloy ribbon has plural laser irradiation mark rows each formed from plural laser irradiation marks on at least one surface of the free solidified surface or the roll contact surface, a line interval is from 10 mm to 60 mm, which is a centerline interval in a middle section in a width direction, between mutually adjacent laser irradiation mark rows, a spot interval is from 0.10 mm to 0.50 mm, which is an interval between center points of the plural laser irradiation marks in each of the plural laser irradiation mark rows, and the number density D (=(1/d1)×(1/d2), d1: line interval, d2: spot interval) of the laser irradiation marks is from 0.05 marks/mmto 0.50 marks/mm.

Fe-based amorphous alloy ribbon and method for producing same, iron core, and transformer

A punching method with a favorable punchability with respect to amorphous metal thin ribbons, an amorphous metal thin strip produced by the method, and a laminated core, are provided. The amorphous metal thin strip has a thickness of from more than 30 μm to 50 μm, and a side configured by a punched surface on which at least a shear droop, a shearing surface, and a fractured surface are observed, the width of the shear droop relative to the thickness of the metal thin strip being 30% or less at the side.

Amorphous metal thin strip, laminated core, and amorphous metal thin ribbon punching method

The soft magnetic alloy of the present disclosure is represented by a composition formula of FeSiBCuMwhere M is at least one type of element selected from a group consisting of Nb, Mo, V, Zr, Hf, and W, and the formula satisfies 82.5&#x2264;a&#x2264;86, 0.3&#x2264;b&#x2264;3, 12.5&#x2264;c&#x2264;15.0, 0.05&#x2264;d&#x2264;0.9, and 0&#x2264;e&#x3c;0.4 in at %. The soft magnetic alloy includes a structure that has a crystal grain with a grain diameter of 60 nm or less in an amorphous phase.

Soft magnetic alloy, soft magnetic alloy ribbon, method of manufacturing soft magnetic alloy ribbon, magnetic core, and component

One embodiment of the present invention provides an Fe-based amorphous alloy ribbon for an Fe-based nanocrystalline alloy, the Fe-based amorphous alloy ribbon being a cooled body of a molten metal that has been applied to a surface of a chill roll, wherein the Fe-based amorphous alloy ribbon includes a recess having a depth of 1 &#x3bc;m or more in a 0.647 mm&#xd7;0.647 mm region located in a central part, in the ribbon width direction, of a ribbon surface, which is a cooled surface, in which a maximum area of the recess having a depth of 1 &#x3bc;m or more is 3000 &#x3bc;mor less; and a method of manufacturing the same.

Fe-based amorphous alloy ribbon for Fe-based nanocrystalline alloy, and method for manufacturing the same

A crystalline Fe-based alloy powder composed of Fe-based alloy particles containing, within a structure thereof, nanocrystal grains having an average grain size of 30 nm or less, and in which d50, which is a particle diameter corresponding to a cumulative frequency of 50% by volume, is from 3.5 &#x3bc;m to 35.0 &#x3bc;m in a cumulative distribution curve that is obtained by laser diffractometry and that shows the relationship between the particle diameter and the cumulative frequency from the small particle diameter side, and a ratio of Fe-based alloy particles having a particle diameter of 2 &#x3bc;m or less to the total of the Fe-based alloy particles, which is determined by laser diffractometry, is from 0% by volume to 8% by volume.

Crystalline Fe-based alloy powder and method for producing same

An alloy powder having an alloy composition represented by FeCuSiBCrSnC, wherein a, b, c, d, e and f are atomic % meeting 0.80&#x2264;a&#x2264;1.80, 2.00&#x2264;b&#x2264;10.00, 11.00&#x2264;c&#x2264;17.00, 0.10&#x2264;d&#x2264;2.00, 0.01&#x2264;e&#x2264;1.50, and 0.10&#x2264;f&#x2264;0.40.

Alloy powder, fe-based nanocrystalline alloy powder and magnetic core

A multilayer block core includes a multilayer block in which nanocrystalline alloy ribbon pieces are layered, the nanocrystalline alloy ribbon pieces having a composition represented by the following Composition Formula (A).FeBSiCuM&#x2003;&#x2003;Composition Formula (A) In Composition Formula (A), each of a, b, c, and d is an atomic percent; the expressions 13.0&#x2264;a&#x2264;17.0, 3.5&#x2264;b&#x2264;5.0, 0.6&#x2264;c&#x2264;1.1, and 0&#x2264;d&#x2264;0.5 are satisfied; and M represents at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and W.

Multilayer block core, multilayer block, and method for producing multilayer block

A magnetic core includes a nanocrystalline alloy ribbon having a composition represented by FeCuBSiAX, where 0.6&#x2264;x&#x3c;1.2, 10&#x2264;y&#x2264;20, 0&#x2264;(y+z)&#x2264;24, and 0&#x2264;a&#x2264;10, 0&#x2264;b&#x2264;5, all numbers being in atomic percent, with the balance being Fe and incidental impurities, and where A is an optional inclusion of at least one element selected from Ni, Mn, Co, V, Cr, Ti, Zr, Nb, Mo, Hf, Ta and W, and X is an optional inclusion of at least one element selected from Re, Y, Zn, As, In, Sn, and rare earth elements. The nanocrylstalline alloy ribbon has a local structure such that nanocrystals with average particle sizes of less than 40 nm are dispersed in an amorphous matrix and are occupying more than 30 volume percent of the ribbon.

Magnetic core based on a nanocrystalline magnetic alloy

A nanocrystalline alloy ribbon has an alloy composition represented by FeCuBSiAXwhere 0.6&#x2264;x&#x3c;1.2, 10&#x2264;y&#x2264;20, 0&#x3c;z&#x2265;10, 10(y+z)24, 0&#x2264;a&#x2264;10, O&#x2264;b&#x2264;5, with the balance being Fe and incidental impurities, where A is an optional inclusion of at least one element selected from Ni, Mn, Co, V, Cr, Ti, Zr, Nb, Mo, Hf, Ta and W, and X is an optional inclusion of at least one element selected from Re, Y, Zn, As, In, Sn, and rare earth elements, all numbers being in atomic percent. The ribbon has a local structure having nanocrystals with average particle sizes of less than 40 nm dispersed in an amorphous matrix, the nanocrystals occupying more than 30 volume percent of the ribbon and has a radius of ribbon curvature of at least 200 mm.

Nanocrystalline magnetic alloy and method of heat-treatment thereof

A Fe-based nanocrystalline alloy powder having an alloy composition represented by the following Composition Formula (1) and having an alloy structure including nanocrystal particles:FeCuSiBMoCrCNb&#x2003;&#x2003;Composition Formula (1),

Fe-based nanocrystalline alloy powder, method of producing the same, Fe-based amorphous alloy powder, and magnetic core

In a fixing device of an image forming apparatus, a pressure lever includes an engagement recess for holding a pressure release lever at a pressure position where a biasing member is actuated, and the pressure release lever includes an engaging protrusion which can be engaged with the engagement recess. Also, the pressure lever includes a slidable contact portion adjacent to the engagement recess. The pressure releaser is capable of increasing or decreasing biasing intensity of the biasing member as the engagement protrusion is slid along the slidable contact portion by a biasing force of the biasing member between a state in which the pressure releaser is at the pressure position and a state in which the pressure releaser is at a release position for releasing pressure contact.

Fixing device and image forming apparatus

A rapidly quenched Fe-based soft-magnetic alloy ribbon having wave-like undulations on a free surface, the wave-like undulations having transverse troughs arranged at substantially constant intervals in a longitudinal direction, and the troughs having an average amplitude D of 20 mm or less, is produced by a method comprising (a) keeping a transverse temperature distribution in a melt nozzle within &#xb1;15&#xb0; C. to have as small a temperature distribution as possible in a melt paddle of the alloy, and (b) forming numerous fine linear scratches on a cooling roll surface by a wire brush, thereby providing a ground surface of the cooling roll with an arithmetical mean (average) roughness Ra of 0.1-1 &#x3bc;m and a maximum roughness depth Rmax of 0.5-10 &#x3bc;m.

Rapidly quenched Fe-based soft-magnetic alloy ribbon and its production method and core

An ultrafine-crystalline alloy ribbon having a composition represented by the general formula of FeABX, wherein A is Cu and/or Au, X is at least one element selected from the group consisting of Si, S, C, P, Al, Ge, Ga and Be, and x, y and z are numbers meeting the conditions of 0&#x3c;x&#x2264;5, 8&#x2264;y&#x2264;22, 0&#x2264;z&#x2264;10, and x+y+z&#x2264;25 by atomic %, and a structure in which ultrafine crystal grains having an average particle size of 30 nm or less being dispersed in a proportion of more than 0% and less than 30% by volume in an amorphous matrix; an ultrafine crystal grains-depleted region comprising ultrafine crystal grains at a number density of less than 500/&#x3bc;mbeing formed in a region of 0.2 mm in width from each side of the ribbon.

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Kumagaya, Japan

Motoki Ohta