Sumitomo Electric Industries, Limited

Sumitomo Electric Sintered Alloy, Ltd.

Asako Watanabe

Tomoyuki Ueno

Toru Maeda

Tatsuya Saito

Naoto Igarashi

Hijiri Tsuruta

Shinichi Hirono

A powder magnetic core includes a compact including soft magnetic powder, and an insulating-resin coating that covers a portion of a surface of the compact. A ratio of an area of the insulating-resin coating to a surface area of the compact is lower than or equal to 85%, and a maximum depth of unevenness on a surface of the insulating-resin coating is smaller than or equal to 20 μm.

Powder magnetic core and electromagnetic part

A method for manufacturing a dust core, including: a step of preparing a raw material powder including a coated pure iron powder composed of a plurality of pure iron particles each having an insulating coating layer, a coated iron alloy powder composed of a plurality of iron alloy particles each having an insulating coating layer, and a metal soap; a step of manufacturing a molded article by performing a compression molding of the raw material powder filled in a mold; and a step of performing a heat treatment of the molded article to eliminate distortions in the coated pure iron powder and the coated iron alloy powder, wherein a difference Tm&#x2212;Td between a melting point Tm of the metal soap and a temperature Td of the mold in the step of manufacturing the molded article is greater than or equal to 90&#xb0; C.

Method for manufacturing dust core and raw material powder for dust core

A method for producing a coated magnetic powder in which particle surfaces of a soft magnetic powder are coated with a silicone resin includes a preparation step of preparing a silicone emulsion by mixing a silicone resin with water containing a surfactant and dispersing the silicone resin in the water, an application step of applying the silicone emulsion onto particle surfaces of a soft magnetic powder, and a drying step of drying the soft magnetic powder after the silicone emulsion is applied.

Method for producing coated magnetic powder, method for producing dust core, and method for producing electromagnetic component

A compact is provided. When the compact is used for a magnetic core, a magnetic path cross section has a cross-sectional perimeter of more than 20 mm, and at least part of a surface of the compact is covered with an iron-based oxide film having an average thickness of 0.5 &#x3bc;m or more and 10.0 &#x3bc;m or less. Letting the proportion of the surface area of the compact to the volume of the compact be surface area/volume, the content of FeOpresent in the iron-based oxide film with respect to 100% by volume of the compact satisfies any one of (1) to (3): (1) less than 0.085% by volume when the (surface area/volume) is 0.40 mmor less, (2) 0.12% or less by volume when the (surface area/volume) is more than 0.40 mmand 0.60 mmor less, and (3) 0.15% or less by volume when the (surface area/volume) is more than 0.60 mm.

Compact, electromagnetic component, and method for producing compact

A dust core includes: a plurality of soft magnetic particles composed of an iron-based material; an insulating layer including a coating layer that is composed mainly of a phosphate and covers the surface of the soft magnetic particles; and insulating pieces containing a constituent material of the insulating layer, each of the insulating pieces being surrounded by at least three mutually adjacent ones of the soft magnetic particles while separated from the insulating layer.

Dust core, electromagnetic component and method for manufacturing dust core

A dust core included in an axial-gap rotary electric machine. The dust core includes a sector-shaped plate-like yoke portion, and a tooth portion integrated with the yoke portion and projecting from the yoke portion. Denoting one of surfaces of the yoke portion from which the tooth portion projects as a toothed surface, the toothed surface has a concave portion provided between a peripheral edge of the tooth portion and a peripheral edge of the yoke portion.

Dust core, stator core, and stator

Core for rotary electric machine

The present invention provides a powder for a magnet which can form a rare earth magnet having excellent magnetic characteristics and which has excellent moldability, a method for producing the powder for a magnet, a powder compact, and a rare earth-iron-boron-based alloy material.

Powder for magnet

The present invention provides a powder for a magnetic member being excellent in moldability and difficult to oxidize, a powder compact produced from the powder, and a magnetic member suitable for a raw material of a magnetic member such as a rare earth magnet. A powder for a magnetic member includes magnetic particleswhich constitute the powder for a magnetic member and each of which is composed of less than 40% by volume of a hydrogen compoundof a rare earth element, and the balance composed of an iron-containing materialwhich contains iron and an iron-boron alloy containing iron and boron. The hydrogen compoundof a rare earth element is dispersed in a phase of the iron-containing material. An antioxidant layerhaving a low-oxygen permeability coefficient is provided on the surface of each of the magnetic particles

Powder for magnetic member, powder compact, and magnetic member

Provided is a soft magnetic powder used for obtaining a dust core having a low hysteresis loss, in particular, in a high temperature range. A soft magnetic powder includes an aggregate of composite magnetic particles, each including a soft magnetic particle containing Fe, Si, and Al, and an insulating coating film disposed on the surface thereof, and satisfies the expressions (1) and (2) below: Expression (1) . . . 27&#x2266;2.5a+b&#x2266;29 and Expression (2) . . . 6&#x2266;b&#x2266;9, where a represents the Si content (mass %) and b represents the Al content (mass %). The soft magnetic powder is capable of reducing the hysteresis loss, in a high-temperature environment, of a dust core obtained using the soft magnetic powder.

Growing community of inventors

Itami, Japan

Asako Watanabe