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Winding inductor and process for manufacturing the same

A wire-wound inductor and manufacturing method technology, applied in inductor/transformer/magnet manufacturing, inductors, fixed inductors, etc., can solve the problems of small saturation magnetization value and difficult magnetic core, and achieve excellent DC overlap characteristics. Effect

Inactive Publication Date: 2010-03-31
TOHO ZINC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, inductors using ferrite cores are not inductors with excellent DC superposition characteristics because they can withstand larger currents and have smaller saturation magnetization values.
[0005] On the other hand, although attempts have been made to manufacture inductors using Fe-based alloys with good DC superposition characteristics, in magnetic cores for inductors using magnetic powder of Fe-based alloys, due to hardness, roughness, etc. During grinding, it is difficult to produce magnetic cores for inductors using Fe-based alloys due to the occurrence of notches, cracks, cracks, etc. in the flange part

Method used

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  • Winding inductor and process for manufacturing the same
  • Winding inductor and process for manufacturing the same
  • Winding inductor and process for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] (1-1)

[0105] The magnetic core for a wire-wound inductor according to Example 1 will be described.

[0106] (Preparation of Magnetic Powder)

[0107] As the magnetic powder of Example 1, Fe—Si—Al alloy powder was used. The magnetic powder is obtained by heating and melting an alloy obtained by using Fe, Si, and Al as raw materials, coarsely pulverizing it with a jaw crusher, and finely pulverizing it with a ball mill for 90 minutes. Among them, the composition ratio of the Fe-Si-Al alloy powder, that is, the composition ratio of Fe:Si:Al, was 85:9.5:5.5.

[0108] (Adjustment of particle size of magnetic powder)

[0109] The particle size of all the Fe-Si-Al alloy powders was adjusted to be 75 μm or less by sieving the Fe—Si—Al alloy powders through a sieve with an opening of 75 μm (hereinafter referred to as magnetic powder 1A). In addition, unlike the magnetic powder 1A, in the particle size adjustment step, the magnetic powder 1B was also prepared which was fine...

Embodiment 2

[0140] Example 2 is an example of Fe-Si-Al-based alloy powder in which the composition ratio of the Fe-Si-Al-based alloy powder used in Example 1 was changed. In addition, the content of the magnetic powder having a particle size of 75 μm or less was also changed for each Fe—Si—Al alloy powder whose composition ratio was changed.

[0141] (Preparation of Magnetic Powder)

[0142] In Example 2, a magnetic body in which the composition ratio of the magnetic body powder 1A (the composition ratio of Fe:Si:Al of the Fe-Si-Al alloy powder is 85:9.5:5.5) used in Example 1 was changed was prepared. Powders 2A to 2F (see Table 3). In addition, the Fe-Si-Al alloy powder in Example 2 was obtained by mechanical pulverization similar to Example powder 1A.

[0143] 〔table 3〕

[0144] Magnetic powder

Composition ratio of Fe:Si:Al

Magnetic powder 2A

89∶4∶7

Magnetic powder 2B

88∶6∶6

Magnetic powder 2C

87∶8.5∶4.5

Magnetic powder 2D ...

Embodiment 3

[0163] In Example 3, the process of obtaining the Fe—Si—Al alloy powder as the magnetic powder 1A used in Example 1 was changed. That is, instead of using a magnetic powder obtained by mechanically pulverizing an alloy, a magnetic powder obtained by an atomization method was used. In addition, in Example 3 as well, Fe—Si—Al alloy powder having the same composition ratio as in Example 2 was prepared.

[0164] (Preparation of Magnetic Powder)

[0165] The Fe-Si-Al alloy powder is obtained by atomizing the Fe-Si-Al alloy, and its composition ratio is shown in Table 5 below.

[0166] 〔table 5〕

[0167] Magnetic powder

Composition ratio of Fe:Si:Al

Example Powder 3A

89∶4∶7

Example powder 3B

88∶6∶6

Example Powder 3C

87∶8.5∶4.5

Example Powder 3D

85∶9.5∶5.5

Example Powder 3E

84.5∶10∶5.5

Example powder 3F

83∶13∶4

[0168] (Adjustment of particle size of magnetic powder)

[0169] By the...

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Abstract

Using a core based on an Fe alloy there are provided an inductor with enhanced current superposition characteristics and a process for manufacturing the same. There is disclosed a winding inductor including a core for winding inductor obtained by compression molding a mixed magnetic substance powder containing a magnetic substance powder and a binder and grinding the molded item and including a metal conductive wire wound in a core section of the core for winding inductor. One form of the winding inductor is characterized in that the magnetic substance powder in component proportion consists of 4 to 13 wt.% Si, 4 to 7 wt.% Al and the balanceFe and unavoidable impurities and has a particle diameter distribution such that 90% or more of the magnetic substance powder has a particle diameter of 75 ¢mu!m or less.

Description

technical field [0001] The present invention relates to a wire-wound inductor using an Fe-based alloy magnetic core and a manufacturing method for the wire-wound inductor, and in particular provides a manufacturing method for a wire-wound inductor using a high-quality magnetic core with fewer notches and cracks , and relates to the invention of a wire-wound inductor excellent in DC superposition characteristics. Background technique [0002] Currently, most chip inductors are used in power circuits and the like in small electronic devices such as mobile phones and computers. Conventional chip inductors often use ferrite cores. The reason is that ferrite can be made into a dense sintered body. That is, since it is a dense sintered body, it is easy to grind, and it is difficult to generate chipping or cracks in the flange portion of the magnetic core that cause magnetic resistance. [0003] However, small electronic instruments requiring large currents are increasing. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/255H01F1/147H01F1/22H01F1/26H01F30/00H01F41/02
CPCH01F1/14791H01F1/26H01F17/045H01F27/255H01F41/0246H01F3/08H01F1/15308Y10T29/49071
Inventor 大槻悦夫金田绫子
Owner TOHO ZINC
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