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Coil encapsulated powder magnetic core and manufacturing method thereof

A technology of pressed powder magnetic core and pressed powder, which is applied in the direction of transformer/inductor coil/winding/connection, etc., can solve the problem that the pressed powder molded body is prone to cracks, and achieve the effect of preventing cracks or ruptures and improving strength.

Active Publication Date: 2011-12-21
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to reduce the size (lower height) of such a coil-enclosed powder magnetic core, and to bend the terminal electrode at the thin-walled part of the powder compact in which the terminal receiving recess is formed, when the terminal electrode is bent, The compressed powder molded body acts strongly, so the compressed powder molded body is prone to cracks

Method used

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  • Coil encapsulated powder magnetic core and manufacturing method thereof
  • Coil encapsulated powder magnetic core and manufacturing method thereof
  • Coil encapsulated powder magnetic core and manufacturing method thereof

Examples

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Embodiment Construction

[0034] figure 1 An embodiment of a coil-enclosed powder magnetic core to which the present invention is applied is shown. The coil-encapsulated powder magnetic core 1 includes: an air-core coil 2 ; a powder compact 3 made of ferromagnetic metal powder in which the air-core coil 2 is embedded; and a terminal electrode 4 electrically connected to the air-core coil 2 .

[0035] The air-core coil 2 is formed by winding a conductive wire coated with an insulation film in a spiral shape, and has edge portions (a pair of lead-out end portions) 2b, 2b that are drawn out from the start end and end point on the upper and lower surfaces of the winding portion 2a in a direction away from each other. . The number of turns of the air-core coil 2 can be appropriately set according to the required inductance.

[0036] The powder compact 3 is formed by press-molding magnetic powder composed of ferromagnetic metal ions coated with an insulating material, and is formed in a substantially recta...

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PUM

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Abstract

The invention provides a coil-embedded dust magnetic core and its manufacturing method, wherein the strength of the compact dust body is enhanced, when a terminal electrode is processed by bending, no crack is generated on the compact dust body. The coil embedded in the compact dust magnetic core possesses the following: the compact dust body of strong magnetic metal dust, wherein a hollow coil is embedded; a terminal electrode, which possesses a connection terminal portion connected with the edge portion of the hollow coil in the compact dust body and a terminal portion protruding to the outside of the compact dust body for external connection, wherein the terminal portion of the terminal electrode is bended along the surface of the compact dust body, and is accommodated at the surface of the compact dust body to form a terminal accommodation concave portion, and the connection terminal portion of the terminal electrode is positioned in the thick wall portion of the compact dust body wherein no terminal accommodation concave portion form.

Description

technical field [0001] The present invention relates to enclosing powder magnetic cores in coils used in inductors, transformers, and other electronic equipment and a manufacturing method thereof. Background technique [0002] In recent years, the miniaturization of electrical and electronic equipment has progressed, and powder magnetic cores that are compact (low in height) and capable of handling large currents are required. In the past, ferrite powder was used as a material for dust cores, but recently, ferromagnetic metal powder is used. Compared with ferrite powder, the saturation magnetic flux density of this ferromagnetic metal powder is higher, and DC superposition characteristics are ensured under high magnetic fields. And suitable for applications requiring large currents. [0003] Patent Document 1 proposes to embed an air-core coil in a compacted powder body made of magnetic metal powder, to bend the terminal electrodes connected to the edge of the air-core coil...

Claims

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Application Information

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IPC IPC(8): H01F27/28H01F27/29
Inventor 水岛隆夫安彦世一川濑恭一樱井胜
Owner ALPS ALPINE CO LTD
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