Patent application number | Description | Published |
20080231409 | Dust Core and Method for Producing Same - The object of the present invention is to provide a powder core and method for making the same that is equipped with insulative coating having superior heat resistance, with the coating making it possible to adequately restrict the flow of eddy currents between particles. | 09-25-2008 |
20090121175 | SOFT MAGNETIC MATERIAL AND DUST CORE PRODUCED THEREFROM - A soft magnetic material includes a plurality of composite magnetic particles each including a metal magnetic particle and an insulating coating film covering the metal magnetic particle. Each of the plurality of composite magnetic particles has a ratio R | 05-14-2009 |
20100028195 | SOFT MAGNETIC MATERIAL, POWDER MAGNETIC CORE, METHOD FOR MANUFACTURING SOFT MAGNETIC MATERIAL, AND METHOD FOR MANUFACTURING POWDER MAGNETIC CORE - A soft magnetic material includes a plurality of composite magnetic particles ( | 02-04-2010 |
20100044618 | SOFT MAGNETIC MATERIAL, DUST CORE, METHOD FOR MANUFACTURING SOFT MAGNETIC MATERIAL, AND METHOD FOR MANUFACTURING DUST CORE - A soft magnetic material, a dust core, a method for manufacturing the soft magnetic material, and a method for manufacturing the dust core that can improve DC bias characteristics are provided. | 02-25-2010 |
20100193726 | SOFT MAGNETIC MATERIAL, DUST CORE, METHOD FOR PRODUCING SOFT MAGNETIC MATERIAL, AND METHOD FOR PRODUCING DUST CORE - A soft magnetic material includes a plurality of composite magnetic particles ( | 08-05-2010 |
20100194516 | CORE FOR REACTORS, ITS MANUFACTURING METHOD, AND REACTOR - To provide a core for reactor capable of reducing the eddy current loss and improving the direct current superposition characteristics, a manufacturing method thereof, and a reactor. A core for reactor M is obtained by press molding metallic magnetic particles coated with an insulating coated film, and the metallic magnetic particles have the following compositions: (1) the mean particle size is 1 μm or more and 70 μm or less; (2) the variation coefficient Cv which is a ratio (σ/μ) of the standard deviation (σ) of the particle size and the mean particle size (μ) is 0.40 or less; and (3) the degree of circularity is 0.8 or more and 1.0 or less. On the outside of the insulating coated film, at least one of a heat-resistance imparting protective film and a flexible protective film is further provided as a outer coated film. | 08-05-2010 |
20100255188 | SOFT MAGNETIC MATERIAL, POWDER MAGNETIC CORE AND METHOD OF MANUFACTURING SOFT MAGNETIC MATERIAL - A soft magnetic material is a soft magnetic material including a composite magnetic particle ( | 10-07-2010 |
20110045174 | SOFT MAGNETIC MATERIAL AND DUST CORE - A method of producing a soft magnetic material is disclosed, wherein the method includes forming a plurality of metal magnetic particles having a ratio of a maximum diameter to an equivalent circle diameter greater than 1.0 and at most 1.3, forming irregularities on a surface of each of the plurality of metal magnetic particles such that a specific surface area of each of the plurality of metal magnetic particles is at least 0.10 m | 02-24-2011 |
20110068506 | METHOD FOR PRODUCING SOFT MAGNETIC MATERIAL AND METHOD FOR PRODUCING DUST CORE - The invention offers a method for producing a soft magnetic material. The method effectively produces a soft magnetic material having soft magnetic metallic particles each coated with a plurality of insulating layers. A soft magnetic material to be used as the material for a dust core is produced through the following steps: a step of preparing a material powder having composite magnetic particles produced by forming an insulating film containing hydrated water on each of the surfaces of soft magnetic metallic particles, a step of preparing a resin material containing silicone that cures through a hydrolysis-polycondensation reaction, and a step of mixing the material powder and the resin material in a heated atmosphere at 80° C. to 150° C. to form a silicone film on the surface of the insulating film. | 03-24-2011 |
20110285486 | PROCESS FOR PRODUCING METALLURGICAL POWDER, PROCESS FOR PRODUCING DUST CORE, DUST CORE, AND COIL COMPONENT - A process for producing metallurgical powder includes a step of coating surfaces of a plurality of first particles | 11-24-2011 |
20120164320 | MANUFACTURING METHOD OF SOFT MAGNETIC MATERIAL AND MANUFACTURING METHOD OF DUST CORE - A manufacturing method of a soft magnetic material has a step of preparing a metal magnetic particle containing iron as the main component, and a step of forming an insulating film surrounding the surface of the metal magnetic particle. The step of forming the insulating film includes a step of mixing and stirring the metal magnetic particle, aluminum alkoxide, silicon alkoxide, and phosphoric acid. | 06-28-2012 |
20120229245 | SOFT MAGNETIC POWDER, GRANULATED POWDER, DUST CORE, ELECTROMAGNETIC COMPONENT, AND METHOD FOR PRODUCING DUST CORE - 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≦2.5a+b≦29 and Expression (2) . . . 6≦b≦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. | 09-13-2012 |
20120237769 | POWDER FOR MAGNET - 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. | 09-20-2012 |
20120244030 | POWDER FOR MAGNET - Provided are a powder for a magnet, which provides a rare-earth magnet having excellent magnet properties and which has excellent formability, a method for producing the powder for a magnet, a powder compact, a rare-earth-iron-based alloy material, and a rare-earth-iron-nitrogen-based alloy material which are used as materials for the magnet, and methods for producing the powder compact and these alloy materials. Magnetic particles | 09-27-2012 |
20120286191 | POWDER FOR MAGNETIC MEMBER, POWDER COMPACT, AND MAGNETIC MEMBER - 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 particles | 11-15-2012 |
20130181802 | SOFT MAGNETIC POWDER, GRANULATED POWDER, DUST CORE, ELECTROMAGNETIC COMPONENT, AND METHOD FOR PRODUCING DUST CORE - Provided are a soft magnetic powder for obtaining a dust core having a low iron loss, the dust core, and a method for producing a dust core. The present invention relates to a soft magnetic powder including a plurality of soft magnetic particles, each having an insulating layer. The Vickers hardness HV0.1 of a material constituting the soft magnetic particles is 300 or more, and the insulating layer contains Si, O, and at least one of an alkali metal and Mg. As long as the soft magnetic powder has such features, a material having a high electric resistance, such as an iron-based alloy, can be used. The eddy current loss can be reduced, and it is possible to effectively obtain a dust core having a low iron loss. | 07-18-2013 |
20130252004 | RARE EARTH-IRON-NITROGEN-BASED ALLOY MATERIAL, METHOD FOR PRODUCING RARE EARTH-IRON-NITROGEN-BASED ALLOY MATERIAL, RARE EARTH-IRON-BASED ALLOY MATERIAL, AND METHOD FOR PRODUCING RARE EARTH-IRON-BASED ALLOY MATERIAL - The present invention provides a rare earth-iron-nitrogen-based alloy material which can produce a rare earth magnet having excellent magnetic characteristics and a method for producing the same, a rare earth-iron-based alloy material suitable as a raw material of the rare earth magnet and a method for producing the alloy material. A rare earth-iron-based alloy material is heat-treated in a hydrogen-containing atmosphere to produce a multi-phase powder | 09-26-2013 |
20130266474 | METHOD FOR PRODUCING MAGNETIC GREEN COMPACTS, MAGNETIC GREEN COMPACT, AND SINTERED BODY - A method is provided for producing magnetic green compacts. Material powder including a rare earth alloy and containing not less than 15 mass % of fine particles with particle diameter of not more than 2 μm is filled into a compacting mold, then compacted and compressed, and subjected to magnetic fields to give a green compact. A powder compact having a packing density 1.05 to 1.2 times the bulk density is subjected to a weak magnetic field of 1 to 2 T to give a compact. The magnetic field strength is increased to not less than 3 T at an excitation rate of 0.01 to 0.15 T/sec, and the strong magnetic field of not less than 3 T is applied to the compact by a high-temperature superconducting coil. The magnetic field is applied by the high-temperature superconducting coil in a direction opposite to a direction applied by a normal conducting coil. | 10-10-2013 |
20130286703 | COMPOSITE MATERIAL, REACTOR-USE CORE, REACTOR, CONVERTER, AND POWER CONVERTER APPARATUS | 10-31-2013 |
20140112818 | METHOD FOR PRODUCING POWDER FOR MAGNET - Provided are a method for producing powder for a magnet, and methods for producing a powder compact, a rare-earth-iron-based alloy material, and a rare-earth-iron-nitrogen-based alloy material. Magnetic particles constituting the powder each have a texture in which grains of a phase of a hydride of a rare-earth element are dispersed in a phase of an iron-containing material. The uniform presence of the phase of the iron-containing material in each magnetic particle results in powder having excellent formability, thereby providing a powder compact having high relative density. The powder is produced by heat-treating rare-earth-iron-based alloy powder in a hydrogen atmosphere to separate the rare-earth element and the iron-containing material and then forming a hydride of the rare-earth element. The powder is compacted. The powder compact is heat-treated in vacuum to form a rare-earth-iron-based alloy material. The rare-earth-iron-based alloy material is heat-treated in a nitrogen atmosphere to form a rare-earth-iron-nitrogen-based alloy material. | 04-24-2014 |