Soft magnetic metal dust core and reactor having thereof

A powder magnetic core, soft magnetic technology, applied in metal processing equipment, magnetic materials, magnetic objects, etc., can solve the problem of not getting DC superposition characteristics, low uniformity of soft magnetic metal powder magnetic core, and insufficient improvement. DC superposition characteristics and other problems, to achieve the effect of excellent DC superposition characteristics

Active Publication Date: 2018-02-02
TDK CORPARATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the distance between the particles of the soft magnetic metal powder can be ensured by using the spacer, there is distribution in the distance between the particles, so distribution occurs in the magnetization of the soft magnetic metal powder.
As a result, the uniformity inside the soft magnetic metal powder core becomes low, so there is a technical problem that the DC superposition characteristic cannot be sufficiently improved
[0014] In this way, in the existing technology, there is a problem that good DC superposition characteristics cannot be obtained

Method used

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  • Soft magnetic metal dust core and reactor having thereof
  • Soft magnetic metal dust core and reactor having thereof
  • Soft magnetic metal dust core and reactor having thereof

Examples

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Effect test

Embodiment

[0066] As the raw material powder, a soft magnetic metal powder composed of Fe-3.0Si, Fe-4.5Si and Fe-6.5Si was produced by a gas atomization method, and a soft magnetic metal powder containing desired Soft magnetic metal powder of B of boron nitride. The soft magnetic metal powder containing B was placed in a tubular furnace, and the soft magnetic metal powder subjected to nitrogen heat treatment in a nitrogen atmosphere was produced at a heat treatment temperature of 1300° C. and a holding time of 30 minutes. The obtained soft magnetic metal powder was dry-classified so that it might become a desired particle diameter, and the powder obtained was prepared. The d50% of the soft magnetic metal powder was measured by a laser diffraction particle size distribution analyzer (HELOS system, manufactured by Sympatec Corporation), and the composition, production method, presence or absence of boron, and d50% of the raw material powder are shown in Table 1.

[0067]

[0068] With ...

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PUM

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Abstract

A soft magnetic metal dust core including a soft magnetic metal powder (11) and a nonmagnetic material (12), in which when observing a field of view including 'n', a natural number of 50 or more, particles of the soft magnetic metal powder (11) on a grinded smooth cross section of the dust core, the soft magnetic metal powder (11) is coated by the nonmagnetic material (12), and a number of an opposing part P (15) is n / 2 or more, in which the opposing part P (15) is a part where a length L (14) is 10 microns or more, and the length L (14) is a continuous length where a distance (13) between particles of the soft magnetic metal powder is 400 nm or less, is provided. The soft magnetic metal dust core is superior in DC superimposing characteristic.

Description

technical field [0001] The present invention relates to a soft magnetic metal powder core using soft magnetic metal powder and a reactor provided with a soft magnetic metal powder core. Background technique [0002] The miniaturization of electrical and electronic equipment is progressing, and small and highly efficient soft magnetic metal powder cores are required. As core materials for reactors and inductors used in applications where large currents are applied, ferrite cores, laminated electrical steel sheets, soft magnetic metal powder cores (using soft magnetic metal powder by mold molding, injection molding) forming, sheet forming, etc.) etc. Although the laminated electrical steel sheet has a large saturation magnetic flux density, there is a problem that the iron loss increases and the efficiency decreases at high frequencies where the driving frequency of the power supply circuit exceeds several tens of kHz. On the other hand, a ferrite core is a core material wit...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F1/33H01F1/22H01F27/255B22F1/052B22F1/065B22F1/102B22F1/16
CPCH01F1/14766H01F1/22H01F1/33H01F27/255B22F1/052B22F1/102B22F1/16B22F1/065C22C38/001C22C38/002C22C38/02H01F1/26H01F41/0246C22C33/02C22C33/0292C22C2202/02H01F1/147B22F9/04B22F3/02B22F2009/044H01F1/20
Inventor 米泽祐黑田朋史谷口友祐
Owner TDK CORPARATION
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