Powder for dust core, dust core made of the powder for dust core by powder compaction, and method of producing the powder for dust core

A technology of powder magnetic core and powder, applied in the field of powder magnetic core and powder magnetic core, can solve the problem of reducing the density of the powder magnetic core, and achieve the effect of high insulation performance

Inactive Publication Date: 2012-02-22
TOYOTA JIDOSHA KK
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  • Application Information

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Problems solved by technology

Therefore, a large gap S11 is generated between powder particles, resulting in a decrease in the density of the powder core

Method used

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  • Powder for dust core, dust core made of the powder for dust core by powder compaction, and method of producing the powder for dust core
  • Powder for dust core, dust core made of the powder for dust core by powder compaction, and method of producing the powder for dust core
  • Powder for dust core, dust core made of the powder for dust core by powder compaction, and method of producing the powder for dust core

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Embodiment Construction

[0059] Preferred implementations of the powder for powder magnetic cores, the powder magnetic cores produced from the powder for powder magnetic cores by powder compaction, and the production method of the powder for powder magnetic cores that realize the present invention will now be given with reference to the accompanying drawings. A detailed description of the example.

[0060]

[0061] figure 1 It is a conceptual diagram of the cross-section of the powder (particle) 1 for powder magnetic cores in this example. figure 2 It is a conceptual diagram illustrating a state in which silica powder (particles) 8 are diffusely bonded to silicon-impregnated layer 3 .

[0062] Such as figure 1 As shown, powder 1 for a dust core ("dust core powder") includes a silicon dioxide diffusion bonding layer 5 and a silicon coating 6 covering iron powder 2 (an example of a soft magnetic metal powder). Silica diffusion bonded layer 5 includes silicon permeated layer 3 formed of silicon e...

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Abstract

A powder (1) for dust core including a soft magnetic metal powder (2) and a silicon impregnated layer (3) made of silicon concentrated in a surface layer of the soft magnetic metal powder (2), in which a silicon dioxide powder (8) is diffusion-bonded to a surface of the silicon impregnated layer (3) to form a diffusion-bonded part (4) while a part of the silicon dioxide powder (8) is impregnated and diffused in the silicon impregnated layer (3) and the other part of the same protrudes from the surface of the silicon impregnated layer (3). The diffusion-bonded part (4) creates a gap (S) with respect to another powder (1) for dust core, thereby providing increased specific resistance.

Description

technical field [0001] The present invention relates to a powder for a powder magnetic core formed with a silicon-impregnated layer in which silicon is concentrated in the surface layer of a soft magnetic metal powder, a powder magnetic core formed from a powder for a powder magnetic core by powder pressing, and production of a powder magnetic powder The core uses the powder method. Background technique [0002] A powder magnetic core is produced by pressing a powder for a powder magnetic core composed of soft magnetic metal powder. Powder magnetic cores have many advantages in that they have magnetic characteristics in which high-frequency loss (hereinafter referred to as "iron loss") occurring according to frequency is lower than that of core parts formed of laminated magnetic steel sheets; Environmental and low cost Suitable for various shapes; its material cost is low. Such powder magnetic cores are suitable for use in, for example, stator cores and rotor cores of vehi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F1/00H01F1/33B22F1/102B22F1/12B22F1/16
CPCH01F1/24H01F1/33H01F41/0246B22F1/102B22F1/16B22F1/12
Inventor 杉山昌挥山口登士也大平翔太服部毅大石雄介
Owner TOYOTA JIDOSHA KK
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