Powder magnetic core for reactor

A powder magnetic core and reactor technology, applied in the manufacture of transformer/inductor core, inductor, inductor/transformer/magnet, etc., can solve the problems of lack of shape, hard silicon steel plate, etc., and reduce the efficiency over time inhibitory effect

Active Publication Date: 2015-11-11
RESONAC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As the raw material of the reactor core, materials such as silicon steel sheets containing 3 to 6.5% Si in Fe have been used in the past, but silicon steel sheets are hard and lack formability

Method used

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  • Powder magnetic core for reactor
  • Powder magnetic core for reactor
  • Powder magnetic core for reactor

Examples

Experimental program
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Effect test

no. 1 Embodiment

[0057] (Powder core A)

[0058] Commercially available powder MH20D (manufactured by Kobe Steel Works, Ltd.) was prepared as the insulating-coated iron-based soft magnetic powder. The powder MH20D is a powder related to Japanese Patent No. 4044591. On the surface of the iron-based soft magnetic powder, a phosphate-based chemical conversion film and a silicone resin film (main particle components in the particle size distribution: 45 to 75 μm) are sequentially formed. One or more elements selected from the group consisting of Co, Na, S, Si, and W are contained in the chemical conversion film. The powder does not contain molding lubricants. In addition, the insulating coating layer composed of the phosphate-based chemical conversion coating and the silicone resin coating is formed relatively uniformly on the surface of the iron-based soft magnetic powder, and the thickness of the insulating coating layer is about 50 nm at the thinnest part. Under the molding pressure of 1200MP...

no. 2 Embodiment

[0071] As the raw material powder, the commercially available powder MH20D (manufactured by Kobe Steel Works, Ltd.) used in the production of the dust core A of the first embodiment was prepared, and the zinc stearate powder prepared as a molding lubricant was dissolved in ethanol, Prepare a molding lubricant solution. The raw material powder was immersed in the molding lubricant solution so that the ratio of the molding lubricant to the raw material powder was the ratio shown in Table 1, and ethanol was volatilized while stirring to coat the surface of the raw material powder with the molding lubricant. Using the obtained raw material powder, powder compaction was performed in the same manner as powder magnetic core A of the first example to produce powder magnetic cores of sample numbers A1 to A7, and the amount of voids between two powder particles was measured. Furthermore, using the manufactured dust core as a core, the effective magnetic permeability μ was measured over ...

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Abstract

Provided is a powder magnetic core for a reactor in which, even when applied to a reactor used in a state in which the core is exposed without being potted, the electromagnetic properties do not readily change over time. The powder magnetic core for a reactor essentially comprises a powder compact made from an insulation-coated-iron-based soft magnetic powder in which an insulating coating film is formed on the surface of an iron-based soft magnetic powder, the change over time of the powder compact over 500 hours at 180ºC being such that the effective permeability decreases by no more than 1%. The porosity between two adjacent insulation-coated-iron-based soft magnetic powder particles in the powder compact is no greater than 2 vol%.

Description

technical field [0001] The present invention relates to a powder magnetic core for a reactor suitable for controlling and adjusting the core of a reactor used for power supply, and particularly relates to a powder magnetic core suitable for use in solar power generation systems, wind power generation systems, natural refrigerant heat pump hot water supply machines, etc. Reactor cores are powder cores for reactors that are potted and exposed. Background technique [0002] A reactor is a passive element assembled by winding a coil around a core. As the core, a core (iron core) made of a homogeneous magnetic material is used, or a plurality of divided magnetic materials are integrated by bonding. core. In automotive reactors, etc., in order to eliminate the influence (especially vibration) from the surroundings, the assembled reactor is housed in a container and sealed (so-called potting) with insulating resin or the like (for example, refer to Patent Document 1 ). On the ot...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01F27/24H01F1/14H01F1/24H01F37/00
CPCH01F41/0246H01F1/24H01F1/26H01F27/255H01F3/08
Inventor稻垣孝石原千生中山纪行
OwnerRESONAC CORP