CN1983474A - Built-in inductor and its production - Google Patents
Built-in inductor and its production Download PDFInfo
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- CN1983474A CN1983474A CN 200510131748 CN200510131748A CN1983474A CN 1983474 A CN1983474 A CN 1983474A CN 200510131748 CN200510131748 CN 200510131748 CN 200510131748 A CN200510131748 A CN 200510131748A CN 1983474 A CN1983474 A CN 1983474A
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- inductor
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- magnetic core
- core seat
- sidewall
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Abstract
The invention is concerned with the manufacture method of inner-embedded inductor, includes the following steps: forms a magnetic core base in advance that is with at least two side-walls, each side-wall encircles a containing space; puts a loop in the containing space; presses in order that top of each side-wall relieve structure and re-distributing, and wrap the loop.
Description
Technical field
The present invention relates to a kind of inductor and manufacture method thereof, particularly relate to a kind of built-in inductor (embedded inductor) and manufacture method thereof.
Background technology
Along with the electronic product microminiaturization, basic and important spare part such as Inductive component are required minification similarly, to meet the trend of assembly microminiaturization.
As Fig. 1 and shown in Figure 2, a kind of existing built-in inductor 1 is to be pre-formed a magnetic core seat 11, and magnetic core seat 11 has a groove 111 and two openings 112,113; One coil 12 places groove 111, and coil 12 has that one first end 121 and one second end, 122, the first ends 121 and second end 122 are stretched out by the opening 112,113 of magnetic core seat 11 respectively and as two pins of inductor 1.Then, insert Magnaglo and casting forming, on magnetic core seat 11, form a magnetic 13, reach the purpose of no air gap in the inductor 1 with this single-piece magnetic core, yet, between magnetic core seat 11 and magnetic 13, have a joint interface 14.
Magnetic 13 with regard to inductor 1, except with Magnaglo as the main component, usually to add thermosetting resin (thermosetting resin), consume magnetic loss (core loss) phenomenon that (eddy current loss) caused with effective reduction eddy current as the insulating properties material.
Yet, owing to have joint interface 14 between magnetic core seat 11 and the magnetic 13, thereby be easy to generate planar defect such as slight crack, and the inductance value of inductor 1 and Dc bias characteristic are relatively poor.In addition, if magnetic core seat 11 and magnetic 13 density are inequality then when being heating and curing, inductor 1 breaks because of thermal stress easily.
Therefore, how providing a kind of built-in inductor and manufacture method thereof, in the hope of simplifying fabrication schedule, avoid the defective that joint interface causes and the thermal stress issues of different materials density, is one of problem for important.
Summary of the invention
Because above-mentioned problem, purpose of the present invention is for providing a kind of built-in inductor and manufacture method thereof of easy, the reliable and integrally formed magnetic core seat of tool, to simplify fabrication schedule, avoid the defective that joint interface causes and the thermal stress issues of different materials density, and have preferable characteristic and usefulness.
For reaching above-mentioned purpose, according to the manufacture method of a kind of built-in inductor of the present invention, the magnetic core seat (magnetic core) that comprises the following steps: to be shaped in advance, this magnetic core seat has at least two sidewalls (sidewalls), and this each sidewall is around an accommodation space; Place a coil (coil) in this accommodation space of this magnetic core seat; And pressurization so that the top destructing of these sidewalls with distribute again, and coat this coil.
For reaching above-mentioned purpose, comprise a magnetic core seat and a coil according to a kind of built-in inductor of the present invention, this magnetic core seat is to be formed by a single E shape main body or the direct pressing of single U-shaped main body, and this coil is subjected to the destructing of this single E shape main body or single U-shaped main body wall and is embedded in this magnetic core seat in distributing again.
From the above, because of according to the top pressurized destructing by the sidewall of single magnetic core seat of a kind of built-in inductor of the present invention and manufacture method thereof with distribute again and cover coil, compared with prior art, the present invention can simplify the fabrication schedule of built-in inductor, do not have planar defect or hole defect existence such as slight crack or interface in inductor inside, can not break because of different materials density is subjected to thermal stress yet, thereby can bear high electric current and possess enough inductance value with storage power, the inductance value of inductor and Dc bias characteristic are also preferable.
Description of drawings
Fig. 1 and Fig. 2 are a kind of schematic diagram of existing built-in inductor;
Fig. 3 is the flow chart according to the manufacture method of a kind of built-in inductor of preferred embodiment of the present invention; And
Fig. 4 to Fig. 8 is the schematic diagram according to the manufacture method of a kind of built-in inductor of preferred embodiment of the present invention.
The element numbers explanation:
1: built-in inductor 11: magnetic core seat
111: groove 112,113: opening
12: 121: the first ends of coil
14: joint interface
2: built-in inductor 20: magnetic core seat
21: base 211,212: opening
22: center pillar 23,24: sidewall
231,241: top 25: coil
251: first end 252: the second end
31: basic mode 32: fixed die
33: patrix
S01-S07: the manufacture method of built-in inductor
Embodiment
Hereinafter with reference to correlative type, a kind of built-in inductor and manufacture method thereof according to preferred embodiment of the present invention are described.
A kind of built-in inductor manufacture method according to preferred embodiment of the present invention may further comprise the steps: the magnetic core seat that is shaped in advance, and this magnetic core seat has at least two sidewalls, and this each sidewall is around an accommodation space; Place a coil in this accommodation space of this magnetic core seat; And pressurization so that the top destructing of this each sidewall with distribute again, and coat this coil.
As shown in Figure 3, comprise step S01 to step S07, in the following steps explanation, also please also refer to Fig. 4 to Fig. 8 according to the manufacture method of a kind of built-in inductor 2 of preferred embodiment of the present invention.
As shown in Figure 4, in step S01, a magnetic core seat 20 in advance is shaped, it has a base 21, a center pillar 22 and at least two sidewalls 23,24, this center pillar 22 and this each sidewall 23,24 lay respectively at the central authorities and the periphery of this base 21, this each sidewall 23,24 is around an accommodation space, and this center pillar 22 is positioned at the central authorities of this accommodation space, and the two ends of this sidewall 23 do not link to each other with the two ends of this sidewall 24.This magnetic core seat 20 can be mixed with a thermosetting powders by at least a magnetic metallic powder, makes the core print seat of similar E shape or U-shaped via press molding, and wherein this magnetic metallic powder can be iron powder or ferrous alloy.
Step S02 provides a coil 25, and this coil 25 has a first end 251 and a second end 252, and can carry out antirust processing earlier.As Fig. 4 and shown in Figure 5, in step S03, place this coil 25 in this accommodation space of this magnetic core seat 20, this coil 25 is sheathed on this center pillar 22 and is positioned over this base 21.At this moment, this magnetic core seat 20 is positioned in the mould, and this first end 251 extends outward this base 21 with the both ends as this inductor 2 from the opening 211,212 of this magnetic core seat 20 respectively with this second end 252.Mould can be made up of basic mode 31 and fixed die 32, particularly, earlier this base 21 is placed in this basic mode 31, this coil 25 is placed on this base 21 again, loads onto this fixed die 32 afterwards, to form complete mould.
This coil 25 can closely be provided with this center pillar 22, make this coil 25 be positioned this inductor 2 centers, so can avoid this coil 25 to tilt, be offset, rupture, even avoid the sense value difference different (variation) that local magnetic saturation is inhomogeneous, increase the inductance value of this inductor 2 and reduce this inductor 2.In addition, this coil 25 be positioned over behind this magnetic core seat 20 also can this coil 25 of antirust processing this each end 251,252.
As Fig. 6 and shown in Figure 7, in step S04, a patrix 33 is that the top 231,241 to this each sidewall 23,24 applies a pressure so that these each top 231,241 destructing with distribute again, and coat this coil 25 except that this each end 251,252.At this moment, situation also can be looked actual in center pillar 22 tops, with the together destructing and distribution again of this each top 231,241.This pressure can be between 7.0ton/cm
2To 8.0ton/cm
2In the present embodiment, for the preferable material behavior of these magnetic core seat 20 tools that makes after pressurizeing, also can make the height of this each sidewall 23,24 be preferably height greater than this center pillar 22, the preferred height difference of this each sidewall 23,24 and this center pillar 22 is between 1.4mm to 2.0mm.
For the density that makes this magnetic core seat 20 after the pressurization can be evenly distributed, the density of this center pillar 22 is higher than the density of this each sidewall 23,24, and wherein the preferable density of this center pillar 22 is between 4.5g/cm
3To 5.1g/cm
3, the density of this each sidewall 23,24 is between 4.3g/cm
3To 4.8g/cm
3, the averag density of this magnetic core seat 20 is preferably and is not more than 5.0g/cm
3, for the ease of transporting, the preferable averag density of this magnetic core seat 20 is between 4.3g/cm
3To 4.8g/cm
3In addition, this each sidewall 23,24 also can equate with the height of this center pillar 22, and this moment, center pillar 22 was with sidewall 23,24 destructing simultaneously, distribute again in step S04.Also have center pillar 22 also can be higher than sidewall 23,24, this moment, center pillar 22 was separately or with sidewall 23,24 destructing simultaneously, distribute again in step S04.
Compared to Figure 1, the present invention need not to insert once more magnetic metallic powder or additionally inserts a magnetic 13 on this coil 25, therefore can simplify the fabrication schedule of this built-in inductor 2.In addition because the height of this magnetic core seat 20 and density is via careful design, so the density of this magnetic core seat 20 evenly distribute and coat this coil 25 equably, thereby than can the bearing temperature variation and avoid the temperature difference to cause deformation.
In step S05, this magnetic core seat 20 of heating curable more, heating-up temperature can be between 150 ℃ to 200 ℃; Step S06 carries out antirust processing to these inductor 2 appearances; Step S07 is as these ends 251,252 of Fig. 8 bending, makes it smooth in these inductor 2 outer rims.
Because punching press need not gone ahead of the rest to sustained height in this each end 251,252 of this coil 25, so the resistance of this coil 25 can not increase, thereby can improve the current efficiency of this coil 25, and reduce the heat energy that is produced when electric current is flowed through this coil 25.
Referring again to Fig. 4 and Fig. 8, a kind of built-in inductor 2 according to preferred embodiment of the present invention comprises a magnetic core seat 20 and a coil 25, this magnetic core seat 20 is formed by a single E shape main body or the direct pressing of single U-shaped main body, and this coil 25 is subjected to the destructing of this single E shape main body or single U-shaped main body wall 23,24 and is embedded in this magnetic core seat 20 in distributing again.This magnetic core seat 20 is E shape or takes the shape of the letter U.
In addition, this magnetic core seat 20 has a base 21, a center pillar 22 and at least two sidewalls 23,24, this center pillar 22 is arranged at the central authorities of this base 21, this each sidewall 23,24 is arranged at the periphery of this base 21, and this each sidewall 23,24 does not contact mutually, and two ends 251,252 of this coil 25 expose to this magnetic core seat 20.
Because this built-in inductor of present embodiment can be by the manufacture method manufacturing of the built-in inductor of previous embodiment, relevant manufacturing process and feature, and the execution mode of this built-in inductor and implementation result discussed in previous embodiment, so repeat no more.
In sum, because of according to the top pressurized destructing by the sidewall of single magnetic core seat of a kind of built-in inductor of the present invention and manufacture method thereof with distribute again and cover coil, compared with prior art, the present invention can simplify the fabrication schedule of built-in inductor, do not have planar defect or hole defect existence such as slight crack or interface in inductor inside, can not break because of different materials density is subjected to thermal stress yet, thereby can bear high electric current and possess enough inductance value with storage power, the inductance value of inductor and Dc bias characteristic are also preferable.
The above only is an illustrative, but not is restricted person.Anyly do not break away from spirit of the present invention and category, and, all should be contained in the appended claim its equivalent modifications of carrying out or change.
Claims (20)
1, a kind of built-in inductor comprises:
Magnetic core seat is formed by the direct pressing of single main body; And
Coil is subjected to the destructing of this single main body wall and is embedded in this magnetic core seat in distributing again.
2, built-in inductor as claimed in claim 1, wherein this single main body is E shape or U-shaped.
3, built-in inductor as claimed in claim 1, wherein two ends of this coil expose to this magnetic core seat.
4, built-in inductor as claimed in claim 1, wherein this single main body has more at least two sidewalls, and this each sidewall is around this accommodation space, and this each sidewall is not for contacting mutually.
5, built-in inductor as claimed in claim 4, wherein this single main body more comprises:
One center pillar, this center pillar is positioned at this accommodation space; And
One base, this center pillar and this each sidewall are arranged at the central authorities and the periphery of this base respectively.
6, built-in inductor as claimed in claim 5, wherein the difference in height of this each sidewall and this center pillar is between 1.4mm to 2.0mm.
7, built-in inductor as claimed in claim 5, wherein the density of this center pillar is higher than the density of this base and/or this each sidewall.
8, built-in inductor as claimed in claim 5, wherein this wall is this each sidewall, this center pillar or this each sidewall and this center pillar.
9, built-in inductor as claimed in claim 1, wherein the averag density of this magnetic core seat is not more than 5.0g/cm
3
10, built-in inductor as claimed in claim 1, wherein this magnetic core seat is that to be mixed in a thermosetting resin by at least one magnetic metallic powder made.
11, built-in inductor as claimed in claim 10, wherein this magnetic metallic powder is iron powder or ferrous alloy.
12, built-in inductor as claimed in claim 1, wherein this magnetic core seat is through the processing that is heating and curing.
13, built-in inductor as claimed in claim 1, wherein each end of this of this coil is through antirust processing or smooth in this inductor outer rim.
14, a kind of manufacture method of built-in inductor comprises the following steps:
The magnetic core seat that is shaped in advance, this magnetic core seat has at least one accommodation space;
Place a coil in this accommodation space of this magnetic core seat; And
Pressurization so that this magnetic core seat top destructing with distribute again, and coat this coil.
15, the manufacture method of built-in inductor as claimed in claim 14, wherein this magnetic core seat has more at least two sidewalls, and this each sidewall is around this accommodation space.
16, the manufacture method of built-in inductor as claimed in claim 15, wherein this magnetic core seat more comprises:
One center pillar, this center pillar is positioned at this accommodation space; And
One base, this center pillar and this each sidewall are arranged at the central authorities and the periphery of this base respectively.
17, the manufacture method of built-in inductor as claimed in claim 16, wherein in this pressurization steps, this each sidewall, this center pillar or this each sidewall and this center pillar top are by destructing and distribution again.
18, the manufacture method of built-in inductor as claimed in claim 14, the step system of this magnetic core seat that wherein is shaped in advance comprises the following steps:
Mix an at least one magnetic metallic powder and a thermosetting powders in a die cavity; And
This magnetic core seat of press molding.
19, the manufacture method of built-in inductor as claimed in claim 14, the step of this magnetic core seat that wherein is shaped more comprises the step of this magnetic core seat that is heating and curing.
20, the manufacture method of built-in inductor as claimed in claim 14 more comprises:
Each end of this of antirust this coil of processing; Or
Each end of this of this coil of bending makes it smooth in this inductor outer rim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510131748 CN1983474A (en) | 2005-12-16 | 2005-12-16 | Built-in inductor and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510131748 CN1983474A (en) | 2005-12-16 | 2005-12-16 | Built-in inductor and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1983474A true CN1983474A (en) | 2007-06-20 |
Family
ID=38165919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510131748 Pending CN1983474A (en) | 2005-12-16 | 2005-12-16 | Built-in inductor and its production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1983474A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112071555A (en) * | 2019-06-10 | 2020-12-11 | 株式会社村田制作所 | Inductor |
| CN112103028A (en) * | 2019-06-17 | 2020-12-18 | 株式会社村田制作所 | Inductor component |
| CN112435843A (en) * | 2020-11-30 | 2021-03-02 | 奇力新电子股份有限公司 | Inductor manufacturing method and inductor |
| CN114068152A (en) * | 2021-12-14 | 2022-02-18 | 苏州邦鼎新材料有限公司 | High-performance high-quality integrated inductance element structure and manufacturing method thereof |
-
2005
- 2005-12-16 CN CN 200510131748 patent/CN1983474A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112071555A (en) * | 2019-06-10 | 2020-12-11 | 株式会社村田制作所 | Inductor |
| CN112103028A (en) * | 2019-06-17 | 2020-12-18 | 株式会社村田制作所 | Inductor component |
| CN112435843A (en) * | 2020-11-30 | 2021-03-02 | 奇力新电子股份有限公司 | Inductor manufacturing method and inductor |
| CN114068152A (en) * | 2021-12-14 | 2022-02-18 | 苏州邦鼎新材料有限公司 | High-performance high-quality integrated inductance element structure and manufacturing method thereof |
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Open date: 20070620 |