Hitachi Powdered Metals Co., Ltd.

Denso Corporation

Hitachi Industrial Equipment Systems Co., Ltd.

Japan Servo Co.,ltd.

Other

Hitachi, Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Kazuo Asaka

Chio Ishihara

Tsuyoshi Akao

Ryoso Masaki

Yuji Enomoto

Katsuyuki Yamazaki

Masashi Kitamura

Motoya Ito

Shoji Ohiwa

Yasuaki Motegi

Akio Takahashi

Yuichi Satsu

Hiroaki Miyata

Noboru Baba

Hideaki Katayama

Kei Ishii

Yuzo Ito

Kazuhiro Satou

Isao Makino

Chikara Tanaka

Tsuyoshi Kagaya

Tamio Takada

Hirotake Hamamatsu

Kohei Muramatsu

Masahiro Suzuki

Hiromitsu Sato

Kenji Fukuda

Satoru Shinzaki

Tatsuro Horie

Katsuaki Sato

Akihiro Okamura

Akeshi Takahashi

Hirohisa Ogawa

Tomoaki Arakawa

Toshiyasu Komatsu

Takashi Koyama

Youichi Nakahara

Kazumasa Ide

Masahide Yamazaki

Aya Hamano

Tsuyoshi c/o Denso Corporation Akao

A method for producing a soft magnetic powdered core includes preparing a mixture of a soft magnetic powder and a resin powder, compacting the mixture into a predetermined shape so as to obtain a compact, and heating the compact. The resin powder has a median size of not more than 30 &#x3bc;m, a maximum particle size of not more than 100 &#x3bc;m, and a specific surface area of not less than 1.0 m/cm, and the additive amount thereof is 0.005 to 2 vol %.

Method for producing soft magnetic powdered core

A method for producing a soft magnetic powdered core comprises a mixing step for forming a raw powder by adding a thermoplastic resin powder to a soft magnetic powder and mixing them, a compacting step for forming a compact by compacting the raw powder into a predetermined shape, a melting and setting step for the resin in which the resin of the compact is melted by heating to at least the melting point of the thermoplastic resin and the melted resin is set by cooling to a room temperature, and a crystallizing step for the resin in which the set resin is heated to not less than the exothermic onset temperature and not more than the endothermic onset temperature, which are measured by DSC analysis of the thermoplastic resin, and is cooled to a room temperature.

A claw teeth type electric rotary machine comprises a stator including an annular core with claws formed from a powder core and an annular coil installed inside the annular core, and a rotor rotatably positioned inside the stator. An inner edge of the annular core is provided with plural claw poles which are protruded at a predetermined interval in a circumferential direction and extended in an axial direction of the annular core so as to alternately meshes with each other. The stator comprises the annular core with claws, the annular coil, and a molded nonmagnetic potting material filled between the annular core with claws and annular coil, so that the annular core with claws and annular coil are integrated with the molded potting non-magnetic material.

Claw teeth type electric rotary machine and manufacturing method for stators

A three-phase permanent magnet brushless motor comprises a stator having three-phase windings, and a rotor having a permanent magnet with a plurality of poles for serving as a field magnet. The stator comprises a stator core which includes a powder core that is compacted at a high density in at least teeth thereof. A combination of the number of magnetic poles of the rotor with the number of slots of the stator satisfies a condition that a least common multiple of the number of slots and the number of magnetic poles is 60 or more in a region in which the number of magnetic poles is 16 or less, and the number of slots is 12 or less. The powder core is made by compacting magnetic powders to have a green density of 7.5 g/cmor higher.

Three-phase permanent magnet brushless motor

A sintered plunger is used for electromagnetic actuators. The sintered member includes: an outer member composed of a soft magnetic material and having an inner hole formed therein, and a shaft having an end portion which is fitted into the outer member. The shaft is composed of a ferromagnetic steel, the outer member peripheral is composed of a sintered member, and the shaft and the outer member are integrally bonded by sintering. As a result, the overall sintered plunger can have good magnetic properties, a good magnetic attraction, a good wear resistance, and a good fatigue strength. Electromagnetic actuators having high responsiveness required in recent years can be produced.

Sintered plunger and production method therefor

A soft magnetic sintered member having uniform dispersion of alloy elements and a production method for the same at low cost are provided. The soft magnetic sintered member consists of, all in mass %, 2.9 to 7% of Cr; 1.5 to 6.88% of Si; and the balance of Fe and inevitable impurities. The production method for a soft magnetic sintered member includes: preparing an Fe alloy powder consisting of 3 to 7 mass % of Cr, 1.5 to 3.5 mass % of Si, and the balance of Fe and inevitable impurities; or a mixed powder in which the Fe alloy powder is mixed with an Si powder having an average particle size of 1 to 45 &#x3bc;m. The production method further includes: compacting the Fe alloy powder or the mixed powder into a green compact having a predetermined shape; and sintering the green compact.

Production method for soft magnetic sintered member

Claw teeth motor core

The present invention provides a production method for a powdered core, including steps of preparing a mixture including a soft magnetic powder and a resin powder to obtain a mixture, compacting the mixture into a predetermined shape to obtain a green compact and heating the green compact, and wherein the resin powder has a median size of not more than 50 &#x3bc;m, and the resin powder amount is 0.01 to 5 vol %. The method reduces production cost, and decreases eddy-current loss Wand hysteresis loss W, whereby a powdered core in which a durability is improved and the technical advantages are expanded can be provided.

Production method for powdered core

A permanent magnet type rotor comprises an inner memberhaving an outer ring portion; an approximately annular outer memberhaving soft magnetism and an inner circumference contacting with an outer circumference of the outer ring portion; and plural permanent magnetsdisposed at equal intervals on the outer circumference of the outer member toward the circumferential direction. At least one of the inner memberand the outer memberis made from a sintered material, and the inner memberand the outer memberare mutually sintered and bonded. Thickness and weight of a dynamotor itself can be reduced and high output and high efficiency can be achieved.

Permanent magnet type rotor and method of manufacturing the rotor

The present invention provides a soft magnetic powder composite core for an electric apparatus produced with soft magnetic particles having electric insulating layers on the surfaces thereof, wherein said electric insulating layers are formed by mixing said soft magnetic particles with an insulating layer-forming solution which comprises a phosphating solution and a rust inhibitor, which is an organic compound containing at least one of nitrogen or sulfur having a lone pair of electrons suppressing the formation of iron oxide and surfactant, and drying the treated soft magnetic particles at a predetermined temperature. The soft magnetic powder composite core is excellent in iron loss and magnetic flux density.

Treatment solution for forming insulating layers on magnetic particles process for forming the insulating layers, and electric device with a soft magnetic powder composite core

Disclosed is a method of manufacturing a machine component of sintered ferriferous composite comprising an outer part and an inner part which is fitted into a hole of the outer part. It has the steps of: preparing one of the outer part and the inner part as a green compact of ferriferous powdered metal and the other as one of a green compact of ferriferous powdered metal, a sintered compact of ferriferous powdered metal and a mass of ferriferous molten metal; inserting the inner part into the hole of the outer part; and sintering the outer part and the inner part to bond the outer part and the inner part. The outer part and the inner part are prepared to have a fitting clearance of approximately -100 to +5 .mu.m. When only the outer part is prepared as a green compact, the outer part is prepared to contain substantially no zinc, and the atmosphere at the sintering step is substantially non-carburizing atmosphere, and when the inner part is prepared as a green compact, the outer and inner parts are prepared so that only the inner part contains zinc, and the atmosphere at the sintering step is substantially carburizing atmosphere.

Manufacturing method of sintered composite machine component having

Process for forming insulating layers on soft magnetic powder composite

A process for making a sintered mechanical part with a complex profile by preparing separately a compact having a shaft (referred to as the inner compact) and a compact having an opening (hereinafter referred to as the outer compact) by the compression of iron-based metal powders, and sintering both compacts in a state where the inner compact is fitted into the cutter compact, wherein a difference in fitting size between the shaft and the opening is selected such that interference fitting takes place with the interference being fixed at a value equal to, or lower than, the figure determined by the following calculation:

Process for making sintered composite mechanical parts

A process for making a mechanical part of a complicated profile by preparing a compact having a projection or shaft (hereinafter called the inner part) and a compact having relative recess or opening (hereinafter called the outer part) by the compression of iron base metal powders, and by fitting the inner part into the outer part followed by sintering. This process is characterized in that the said inner part contains carbon as an essential component in an amount that is larger than the carbon content of the said outer part by 0.2% by weight or higher.

Process for making composite mechanical parts by sintering

Growing community of inventors

Matsudo, Japan

Kazuo Asaka