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Powder magnetic core, manufacturing method of powder magnetic core, inductor provided with powder magnetic core, and electronic/electrical equipment equipped with inductor

A powder magnetic core and manufacturing method technology, applied in transformer/inductor parts, inductance/transformer/magnet manufacturing, transformer/inductor coil/winding/connection, etc., can solve the problem of no DC superposition characteristics, evaluation, etc. , to achieve the effect of improving DC superposition characteristics and reducing iron loss

Active Publication Date: 2019-01-08
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in Patent Document 2, no evaluation of DC superposition characteristics is performed.

Method used

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  • Powder magnetic core, manufacturing method of powder magnetic core, inductor provided with powder magnetic core, and electronic/electrical equipment equipped with inductor
  • Powder magnetic core, manufacturing method of powder magnetic core, inductor provided with powder magnetic core, and electronic/electrical equipment equipped with inductor
  • Powder magnetic core, manufacturing method of powder magnetic core, inductor provided with powder magnetic core, and electronic/electrical equipment equipped with inductor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] (1) Preparation of Fe-based amorphous alloy powder

[0134] to form Fe 71原子％ Ni 6原子％ Cr 2原子％ P 11原子％ C 8原子％ B 2原子％ The raw materials were weighed using this composition method, and powders (amorphous powders) of 5 kinds of amorphous magnetic materials having different particle size distributions were produced by using a water atomization method. The particle size distribution of the obtained amorphous magnetic material powder was measured in terms of volume distribution using "Microtrac particle size distribution measuring device MT3300EX" manufactured by Nikkiso Co., Ltd. In the volume-based particle size distribution, the cumulative particle size distribution from the small particle size side is 50% of the particle size (median size) D 50 A is 5 μm. In addition, as the powder of the crystalline magnetic material, a Fe-Si-Cr alloy is prepared, specifically, the content of Si is 6.4% by mass, the content of Cr is 3.1% by mass, and the balance is composed of Fe an...

example 2

[0154] (Evaluation example 2) μ0×μ5500×Isat / ρ

[0155] The initial magnetic permeability μ 0 measured by Test Example 2 and the relative magnetic permeability μ 5500 when the DC applied magnetic field is 5500 A / m, and Isat / ρ based on the results measured by Test Examples 1 and 3 (by ΔL / L 0 The numerical part of the product of the applied current value Isat at 30% divided by the value of the core density ρ measured in Test Example 1 is μ0×μ5500×Isat / ρ, which is more suitable for relative evaluation of DC superposition characteristics than Isat . The evaluation results are shown in Table 2.

[0156] Whereas μ0 and μ5500 are values ​​normalized by volume, Isat is not a value normalized by volume and mass. Therefore, it is affected by the size of the powder core (ring core). Therefore, by dividing Isat by ρ as an evaluation object, the DC superposition characteristics can be generalized and comparisons can be made easily.

[0157] (Evaluation example 3) μ0×Isat / ρ

[0158] The...

Embodiment 2 to 10

[0162] As shown in Table 3, the so-called magnetic powders used in Example 1 are magnetic powders with different particle diameters of powders of amorphous magnetic materials and powders of crystalline magnetic materials, surface treatment and particle diameters. In Example 1, a toroidal core composed of a dust core was obtained in the same manner. In addition, the powder of the amorphous magnetic material used in Example 10 was produced by an atomization method in which gas atomization and water atomization were performed continuously. D in Table 3 50 Column C indicates that the particle size distribution of crystalline magnetic material powder is measured in terms of volume distribution using the "Microtrac particle size distribution measuring device MT3300EX" manufactured by Nikkiso Co., Ltd., from the small particle size side of the volume-based particle size distribution. The cumulative particle size distribution from the beginning is the 50% particle size (median partic...

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Abstract

Provided is a powder magnetic core containing powder of a crystalline magnetic material and a powder of an amorphous magnetic material. In an inductor including the powder magnetic core, DC superposition characteristics can be improved and iron loss can be reduced. A powder magnetic core (1) comprising a powder of a crystalline magnetic material and a powder of an amorphous magnetic material, wherein the powder of the amorphous magnetic material has a median diameter D50A of 15 μm or less and is compatible with a crystalline magnetic material The median diameter D50C of the powder of the material satisfies the following formula (1), 1≤D50A / D50C≤3.5(1).

Description

technical field [0001] The present invention relates to a powder magnetic core, a method for manufacturing the powder magnetic core, an inductor including the powder magnetic core, and an electronic / electric device equipped with the inductor. In this specification, the term "inductor" refers to a passive element including a core material including a powder magnetic core and a coil, and includes a concept of a reactor. Background technique [0002] Powder magnetic cores used in step-up circuits of hybrid vehicles, reactors for power generation and transformation equipment, transformers, and inductors such as choke coils can be obtained by powder molding of soft magnetic powder . Inductors equipped with such dust cores are required to have both low iron loss and excellent DC superposition characteristics. [0003] Patent Document 1 discloses an inductor formed by pressurizing a mixed powder mixed with a magnetic powder and a binder as means for solving the above-mentioned pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F27/255H01F27/28H01F27/34H01F41/02
CPCH01F27/255H01F27/2895H01F27/34H01F41/0246H01F1/147H01F1/153
Inventor 中林亮小岛章伸安彦世一佐藤昭佐藤桂一郎水岛隆夫
Owner ALPS ALPINE CO LTD
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