JP4376168B2 - Inductor and manufacturing method thereof - Google Patents
Inductor and manufacturing method thereof Download PDFInfo
- Publication number
- JP4376168B2 JP4376168B2 JP2004316317A JP2004316317A JP4376168B2 JP 4376168 B2 JP4376168 B2 JP 4376168B2 JP 2004316317 A JP2004316317 A JP 2004316317A JP 2004316317 A JP2004316317 A JP 2004316317A JP 4376168 B2 JP4376168 B2 JP 4376168B2
- Authority
- JP
- Japan
- Prior art keywords
- winding
- inductor
- green compact
- shape
- manufacturing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Coils Or Transformers For Communication (AREA)
Description
本発明は、携帯端末、電子機器等の電源回路に用いられるインダクタとその製造方法に関する。 The present invention relates to an inductor used for a power supply circuit of a portable terminal, an electronic device, and the like and a manufacturing method thereof.
近年、装置の小型化と高出力化に伴い、電源回路に使用されるインダクタには低抵抗と小型化の要求が高まっている。こうした要求に対し、巻線を磁性粉末中に置き、成形金型中で圧密成形してなるインダクタが開発された。このインダクタは、高い線占有率により低抵抗であり、無駄なスペースのないインダクタであるため、市場ニーズは非常に高く、高い生産性も要求され、生産性を高める発明が多く提案されている。 In recent years, with the miniaturization and high output of devices, demands for low resistance and miniaturization are increasing for inductors used in power supply circuits. In response to these requirements, inductors have been developed in which windings are placed in magnetic powder and compacted in a molding die. Since this inductor is an inductor having a low resistance due to a high line occupancy ratio and no useless space, market needs are very high, high productivity is required, and many inventions for improving productivity have been proposed.
図６は、従来のインダクタにおける成形金型に巻線４１を挿入する時の断面図である。成形金型下パンチ７１の上に、あらかじめ成形した圧粉体１ｃを乗せ、ついで巻線４１を成形金型下型５１と、成形金型上型６１との間に配置し、磁性粉末を投入して、全体を成形してインダクタを得る。
FIG. 6 is a cross-sectional view when the
例えば、特許文献１では、事前に２つの圧粉体を成形しておき、成形金型内に巻線と共に配置し、圧粉体を圧壊・再圧密する製造方法が提案されている。しかし、この方法では、巻線端子を正確に把持し、金型内に位置決めすることができるが、平角線等のスプリングバックの多い巻線では、その端子形状のばらつきが大きく、金型内部で巻線位置が大きく変動してしまう。 For example, Patent Document 1 proposes a manufacturing method in which two green compacts are formed in advance, placed together with a winding in a molding die, and the green compact is crushed and reconsolidated. However, with this method, the winding terminal can be accurately gripped and positioned in the mold. However, in the case of winding with a large amount of spring back such as a rectangular wire, the terminal shape varies greatly, and the inside of the mold Winding position will fluctuate greatly.
また、特許文献２では、巻線両端子を一旦圧粉体外部に露出させ、そこに別途端子を接合しているが、この方法では接合に伴う工程が増加してしまう上、構造も複雑となり、インダクタの小型化を阻害する要因となってしまう。 In Patent Document 2, both terminals of the winding are once exposed to the outside of the green compact, and the terminals are separately joined thereto. However, this method increases the number of steps involved in joining and makes the structure complicated. This will be a factor that hinders downsizing of the inductor.
特許文献３では、巻線をリードフレームに接続固定し、成型金型にリードフレームを利用して位置決めする製造方法が提案されているが、特許文献２と同様に、リードフレームへの接続工程が増加してしてしまう。さらに圧粉体の形状をうず巻き形状とすることにより、位置決めを正確に行えるとの提案があるが、巻線挿入時に圧粉体と接触する可能性を考えると、単純なうず巻き形状では、ある程度の隙間を作らなければならない。その場合、前述のスプリングバックによる巻線位置のばらつき程度の隙間を確保する必要があり、巻線の位置決めのための有効な対策とは言い難い。 In Patent Document 3, a manufacturing method is proposed in which a winding is connected and fixed to a lead frame, and positioning is performed using a lead frame in a molding die. However, as in Patent Document 2, a connection process to a lead frame is performed. It will increase. Furthermore, there is a proposal that positioning can be performed accurately by making the shape of the green compact into a spiral shape, but considering the possibility of contact with the green compact when inserting the winding, a simple spiral shape has some degree of A gap must be made. In that case, it is necessary to secure a gap with a degree of variation in winding position due to the above-described springback, which is not an effective measure for positioning the winding.
圧粉体内部に巻線を内包し、圧粉成型により製造されるインダクタでは、巻線の位置決め精度に問題がある。そのため、製品寸法は、コイル外形に比較し大きく設定せねばならず、インダクタの小型化を阻害する一因となっていた。従って、本発明の課題は、巻線の位置決め精度を確保したインダクタおよびその製造方法を提供することである。 Inductors that are manufactured by compacting and forming a winding inside the green compact have a problem in the positioning accuracy of the winding. For this reason, the product dimensions have to be set larger than the coil outer shape, which is one factor that hinders downsizing of the inductor. Accordingly, an object of the present invention is to provide an inductor and a method of manufacturing the same that ensure the winding positioning accuracy.
本発明は、第１の部分である圧粉体を事前に金型内部に配置し、巻線を成型金型内部に位置決めし、圧粉成型するインダクタにおいて、圧粉体はコイル内径と嵌合する突起を持ち、かつ突起の先端に円錐台形状を有するものである。
In the present invention, the green compact, which is the first part, is placed in the mold in advance, the winding is positioned inside the mold, and the green compact is fitted to the inner diameter of the coil. And a frustoconical shape at the tip of the projection .
即ち、本発明は、第１の部分と、第２の部分とが合体されて構成された磁芯と、前記磁芯の中に内包された巻線と、外部端子とで構成されたインダクタにおいて、前記外部端子は、前記巻線の端部が、前記磁芯の外部に引き出されて形成されており、前記第１の部分は、平板の中央部に、円柱部分と、先端の円錐台形状との合体した形状の突起部が配置された圧粉体であり、インダクタの一体成型を行う前に予備成型されており、また、第２の部分は、前記第１の部分である圧粉体と巻線とを組み立てた後のプレス成形の段階で形成された形状のインダクタである。
That is, the present invention relates to an inductor composed of a magnetic core formed by combining a first portion and a second portion, a winding included in the magnetic core, and an external terminal. The external terminal is formed such that an end portion of the winding is drawn out of the magnetic core, and the first portion has a cylindrical portion and a truncated cone shape at the center of a flat plate. The green compact is a green compact in which protrusions in the shape of the unit are arranged, and is preformed before the integral molding of the inductor, and the second part is the green compact as the first part. And an inductor having a shape formed at the stage of press molding after assembling the wire and the winding.
また、本発明は、磁性粉末を事前にプレスして成形された圧粉体に、巻線を嵌合させた後、金型に磁性粉末を投入して、全体をプレス成形して製造されるインダクタの製造方法において、前記圧粉体は、前記巻線の内径と嵌合する突起部を持ち、かつ前記突起部の形状は、円柱部分と、先端の円錐台形状との合体した形状とし、前記圧粉体を金型に配置した後、前記圧粉体の突起部を、前記巻線の内側に嵌合させるインダクタの製造方法である。
Further, the present invention, the magnetic powder in the green compact is molded by pressing in advance, after fitting the windings, the magnetic powder in the mold was charged, it is manufactured by press-forming the whole in the method for manufacturing an inductor, the powder compact has a protruding portion for the inner diameter mating of the winding, and the shape of the protrusions, and the cylindrical section, the coalesced shape of a truncated cone shape of the tip and, after the powder compact was placed in a mold, the projection portion of the green compact, is a manufacturing method of the inductor to be fitted inside the winding.
上記の構成により、圧粉体を金型内に配置した後、コイルを挿入する際、前記突起の先端の円錐台形状部がガイドとなり、コイルを所定の位置に誘導する事が出来るため、突起とコイル内径のハメアイ隙間は少なく設定することができる。このため、成形金型に対してコイルを正確に位置決めすることが可能となり、コイルの位置ずれに起因する成形不良を低減することができ、更にインダクタの小型化に非常に有効である。 With the above configuration, when the coil is inserted after the green compact is placed in the mold, the truncated cone-shaped portion at the tip of the projection serves as a guide, and the coil can be guided to a predetermined position. The gap between the coil inner diameters can be set small. For this reason, it is possible to accurately position the coil with respect to the molding die, it is possible to reduce molding defects due to the displacement of the coil, and it is very effective for downsizing the inductor.
以下、本発明のインダクタの実施の形態について、図面を参照しながら説明する。 Hereinafter, embodiments of the inductor of the present invention will be described with reference to the drawings.
図１は、本発明のインダクタの説明図である。図１（ａ）は上面図で、図１（ｂ）は、図１（ａ）のＡＡ断面図である。インダクタ１０は、圧粉体１ａと、巻線４０と、圧粉体１ａを除いた磁芯部分とで構成されている。ここで、前記圧粉体１ａと圧粉体１ａを除いた磁芯部分との境界は、インダクタの完成後も残っている。
FIG. 1 is an explanatory diagram of an inductor according to the present invention. FIG. 1A is a top view, and FIG. 1B is a cross-sectional view taken along line AA in FIG. The
図２は、本発明のインダクタの第１の部分である圧粉体１ａの斜視図である。図３は、本発明のインダクタの他の例の圧粉体１ｂの斜視図であり、図４は、本発明のインダクタの製造方法において金型成型にて図２に示した圧粉体１ｂに巻線を挿入する時の断面図である。図５は、本発明のインダクタの製造方法において、成形金型にて図３に示した圧粉体に巻線を挿入する時の断面図である。 FIG. 2 is a perspective view of a green compact 1a which is the first part of the inductor according to the present invention. FIG. 3 is a perspective view of another example of the green compact 1b of the inductor of the present invention, and FIG. 4 shows the green compact 1b shown in FIG. It is sectional drawing when inserting a coil | winding. FIG. 5 is a cross-sectional view when a winding is inserted into the green compact shown in FIG. 3 with a molding die in the inductor manufacturing method of the present invention.
図２及び図３に示すように、本発明のインダクタの圧粉体には、先端が円錐台形状の突起があるため、図４及び図５に示すとおり、巻線を金型内部に挿入する際、突起が巻線の内径との嵌合のためのガイドとして機能するため、正確に巻線を位置決めすることが可能である。その際、巻線のスプリングバックにより端子位置がばらつくため、巻線の中心位置も変動しようとするが、圧粉体の円錐台形状部があるため、巻線の内径と突起外形の隙間以上に変動することはない。 As shown in FIGS. 2 and 3, the green compact of the inductor according to the present invention has a truncated cone-shaped protrusion, so that the winding is inserted into the mold as shown in FIGS. At this time, since the projection functions as a guide for fitting with the inner diameter of the winding, it is possible to accurately position the winding. At that time, the terminal position varies due to the spring back of the winding, so the center position of the winding also tends to change, but because of the frustoconical shape part of the green compact, it exceeds the gap between the inner diameter of the winding and the outer shape of the protrusion. It does not fluctuate.
更に、突起には円錐形状部のガイドがあるため、矩形断面の圧粉体に比べ、挿入が容易であり、かつ巻線の内径と突起外形の隙間を小さくすることが可能である。巻線は平角線が主に用いられ、通常、エッジワイズ巻にて製作されるが、巻線の内径は巻線時に使用される巻芯外形により規制されるため、巻線外形に比べ、ばらつきが非常に少ない。このため、圧粉体の突起外径のばらつき程度のハメアイ隙間を考慮すれば良いため、巻線の外径を位置決めに利用する場合と比較しても、本発明におけるコイル位置のばらつきは小さくすることができる。 Furthermore, since the projection has a guide having a conical shape, it can be easily inserted and the gap between the inner diameter of the winding and the outer shape of the projection can be made smaller than a green compact having a rectangular cross section. A flat wire is mainly used for the winding, and it is usually manufactured by edgewise winding. However, since the inner diameter of the winding is regulated by the outer shape of the core used at the time of winding, there is a variation compared to the winding outer shape. There are very few. For this reason, since it is only necessary to consider a gap between the green outer diameters of the protrusions of the green compact, variations in the coil position in the present invention are reduced compared to the case where the outer diameter of the winding is used for positioning. be able to.
巻線を挿入後は、巻線の上方に磁性粉末又は圧粉体を供給し、圧粉成型することで、インダクタが形成される。その際、磁性粉末を供給する場合と圧粉体を供給する場合に寄らず、本発明は有効であることは明白である。なお、図面では突起先端は平面形状となっているが、突端形状でもよく、更に球面形状でも同様の効果が期待できる。 After inserting the winding, the inductor is formed by supplying magnetic powder or green compact above the winding and compacting it. In this case, it is obvious that the present invention is effective regardless of whether the magnetic powder is supplied or the green compact is supplied. In the drawing, the tip of the protrusion has a planar shape, but it may be a tip shape, and the same effect can be expected with a spherical shape.
磁芯の材料は、通常、ＦｅＳｉ系、あるいはＦｅＳｉＡｌ系、あるいはＦｅＳｉＢ系のダスト材料を使用するが、その他、アモルファス材料等も使用できる。 As the material for the magnetic core, FeSi-based, FeSiAl-based, or FeSiB-based dust materials are usually used, but amorphous materials can also be used.
本発明のインダクタは、巻線の位置決めが容易なため、インダクタの生産性を向上することができる。 The inductor according to the present invention can improve the productivity of the inductor since the positioning of the winding is easy.
１ａ，１ｂ，１ｃ 圧粉体
２ａ，２ｂ 突起
３ａ，３ｂ 円錐台形状部
４，４１ 巻線
５，５１ 成形金型下型
６，６１ 成形金型上型
７，７１ 成形金型下パンチ
８，８１ 成形金型上パンチ
１０ インダクタ
４０ 巻線
1a, 1b, 1c Green compact 2a,
Claims (2)
The green compact is shaped by pressing magnetic powder in advance, after fitting the windings, the magnetic powder in the mold was put, in the manufacturing method of the inductor is manufactured by press-forming the whole, the green compact has a protrusion for inner diameter and fitting the windings in the center of the plate, and the shape of the protrusion, and a columnar portion, the coalesced shape of a truncated cone shape of the tip , after said green compact was placed in a mold, the projection portion of the green compact, the manufacturing method of the inductor, characterized in that to fit inside the winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004316317A JP4376168B2 (en) | 2004-10-29 | 2004-10-29 | Inductor and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004316317A JP4376168B2 (en) | 2004-10-29 | 2004-10-29 | Inductor and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2006128473A JP2006128473A (en) | 2006-05-18 |
| JP4376168B2 true JP4376168B2 (en) | 2009-12-02 |
Family
ID=36722842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004316317A Expired - Fee Related JP4376168B2 (en) | 2004-10-29 | 2004-10-29 | Inductor and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4376168B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106158246A (en) * | 2013-01-10 | 2016-11-23 | 乾坤科技股份有限公司 | There is the magnetic devices of high saturation current and low core loss |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013254911A (en) * | 2012-06-08 | 2013-12-19 | Sumida Corporation | Method of manufacturing magnetic element and magnetic element |
| JP2014130879A (en) * | 2012-12-28 | 2014-07-10 | Panasonic Corp | Manufacturing method of coil-embedded magnetic element |
| JP6338350B2 (en) * | 2013-10-29 | 2018-06-06 | Koa株式会社 | Inductor manufacturing method |
| JP7107283B2 (en) * | 2019-06-10 | 2022-07-27 | 株式会社村田製作所 | inductor |
-
2004
- 2004-10-29 JP JP2004316317A patent/JP4376168B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106158246A (en) * | 2013-01-10 | 2016-11-23 | 乾坤科技股份有限公司 | There is the magnetic devices of high saturation current and low core loss |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006128473A (en) | 2006-05-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9165710B2 (en) | Method of producing a surface-mount inductor | |
| CN100568416C (en) | Coil-embedded dust core | |
| TWI564918B (en) | Surface-mount inductor and production method thereof | |
| CN103295754A (en) | Method of manufacturing surface mount inductor | |
| CN109979727A (en) | A kind of patch type compression molding inductance and manufacturing method | |
| US20180001523A1 (en) | Power inductor encapsulated through injection molding | |
| JP4768372B2 (en) | Coil-enclosed magnetic component and method for manufacturing the same | |
| JP2010177492A (en) | Method for manufacturing mold coil | |
| US10262793B2 (en) | Manufacturing method of surface mounted inductor | |
| CN108463862A (en) | The manufacturing method of reactor and reactor | |
| US20100134233A1 (en) | Inductor and method for making the same | |
| JP6288510B2 (en) | Reactor | |
| JP4768373B2 (en) | Coil-enclosed magnetic component and method for manufacturing the same | |
| TWI630629B (en) | Electronic component manufacturing method, electronic component | |
| JP2004153068A (en) | Dust inductor and its manufacturing method | |
| JP4376168B2 (en) | Inductor and manufacturing method thereof | |
| JP3707460B2 (en) | Coil parts | |
| JP3707461B2 (en) | Coil parts manufacturing method | |
| JP3888078B2 (en) | Coil component manufacturing method and apparatus | |
| JP4705191B1 (en) | Molded coil manufacturing method | |
| TW201530580A (en) | Method for producing electronic component, and electronic component | |
| JP2015201537A (en) | Coil component and manufacturing method for the same | |
| CN113345705B (en) | Manufacturing process of inductance element with high manufacturing efficiency | |
| CN118073081A (en) | Integrally formed inductor formed by E-Core through hot press forming and manufacturing method thereof | |
| JP2006033985A (en) | Manufacturing method for modified cross-section coil and modified cross-section coil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20070611 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20090617 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20090806 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20090902 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20090908 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120918 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120918 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130918 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130918 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140918 Year of fee payment: 5 |
|
| LAPS | Cancellation because of no payment of annual fees |