Inductor and manufacturing method thereof

A technology of inductance components and manufacturing methods, which is applied in the directions of electrical components, inductance/transformer/magnet manufacturing, transformer/inductor cores, etc., can solve the problems of insufficient coil interior, pressurization, and coil insulation coverage damage.

Active Publication Date: 2014-04-09
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In addition, in Patent Document 2 shown below, in the process of press forming, different molds are used to make the forming process into two stages, and as in the above example, in the first forming process and the second forming process At the boundary of the separately obtained surfaces, there is a concern that the adhesion of the magnetic material is insufficient, and peeling or cracks may occur on the boundary surface

Method used

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  • Inductor and manufacturing method thereof
  • Inductor and manufacturing method thereof
  • Inductor and manufacturing method thereof

Examples

Experimental program
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Example

[0067] The first embodiment

[0068] Such as figure 1 and figure 2 As shown, the inductance element 2 in one embodiment of the present invention has a core 4 as a compression molded body, and a winding 6 in which a conductor 6 a is wound in a coil shape inside the core 4. The conductor 6a is composed of, for example, a wire and an insulating coating layer corresponding to the outer circumference of the wire to be covered.

[0069] The wire is made of Cu, Al, Fe, Ag, Au, phosphor bronze, etc., for example. The insulating covering layer is made of, for example, polyurethane, polyamideimide, polyimide, polyester, polyesterimide, polyester nylon, or the like. The cross-sectional shape of the conductor 6a is not particularly limited, and examples thereof include a circular shape and a rectangular shape.

[0070] The core 4 is formed by compression-molding particles containing magnetic powder and a binder. The magnetic powder is not particularly limited, and examples include ferrites s...

Example

[0096] Second embodiment

[0097] In the above embodiment, in image 3 The particles in the first filling performed in step S2 and the particles in the second filling performed in step S3 shown are the same particles, but in this embodiment, different particles are used. Except for this, this embodiment is the same as the above-mentioned first embodiment, and can have the same effect. Hereinafter, the different parts will be explained in detail, and the explanation of the common parts will be partially omitted.

[0098] In this embodiment, as Figure 6A As shown, the first particles 4Aa filled before arranging the winding part 6 as an insertion member inside the cavity 20 and the first particles 4Aa filled in the cavity 20 after the winding part 6 is arranged inside the cavity 20 2 particles are different.

[0099] Afterwards, such as Figure 6B As shown, the upper main punch 14 performs low pressure pressurization. The pressing force between the upper main punch 14 and the lower ...

Example Embodiment

[0110] Example 1

[0111] First, the preparation should be filled to Figure 4A The particles in the cavity 20 of the mold 10 are shown. A silane coupling agent dissolved in water was added to 100 g of a Fe-Si-Cr alloy (average particle size 0.5-10 μm) as a magnetic powder, and heated at 110°C for 30 minutes to form an insulating film on the surface of the magnetic powder. In the above-mentioned magnetic powder, 3% by weight relative to the weight of the magnetic powder, epoxy resin diluted in acetone was added and stirred. After that, it was passed through a 250 μm sieve and dried at room temperature for 24 hours. Obtain magnetic powder particles.

[0112] Such as Figure 4B As shown, in the mold 10, the magnetic powder containing the binder is put into 1 / 3 of the depth of the mold (the entire depth of the cavity to the upper surface of the lower main punch 12). At this time, the lower sub-punch 18 at the center of the lower part of the mold is lowered by about 3 mm relative to...

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PUM

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Abstract

The invention provides an inductor which generates fewer cracks, has high initial magnetic permeability and is unlikely to cause short circuit failure, and a method for easily manufacturing the inductor with low cost. The magnetic powder density of the inner peripheral portion (4a) and the outer peripheral portion (4b) of a wiring portion (6) in a core portion (4) is different, and the magnetic powder density of the core portion (4) in the inner peripheral portion (4a) of the wiring portion (6) is higher than that of the core portion (4) in the outer peripheral portion (4b) of the wiring portion (6).

Description

technical field [0001] The present invention relates to an inductance element in which a winding portion wound in a coil shape is integrated inside a core portion made of a magnetic material, and a method for manufacturing the same. Background technique [0002] As an inductance element, for example, a surface mount type inductance element used as a circuit element such as a DC / DC converter mounted in a computer or a portable electronic device is known. [0003] As an example of this inductance element, there is known a dust core obtained by adding a binder to metal magnetic powder and press-molding (a core insulated from the surface of metal magnetic powder and press-molded). The inductance element of the coil is buried inside. Since the inductance element has a structure in which the terminal electrodes are in direct contact with the powder core, insulation is required for the metal magnetic powder. Therefore, the surface of the particles of the metal magnetic powder is ...

Claims

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Application Information

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IPC IPC(8): H01F41/00H01F41/02H01F27/24
Inventor 山下保英佐藤千绪美会田智彦石山茂树
Owner TDK CORPARATION
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