CN104200981A - Inductor manufacturing method - Google Patents
Inductor manufacturing method Download PDFInfo
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- CN104200981A CN104200981A CN201410415755.8A CN201410415755A CN104200981A CN 104200981 A CN104200981 A CN 104200981A CN 201410415755 A CN201410415755 A CN 201410415755A CN 104200981 A CN104200981 A CN 104200981A
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Abstract
The invention provides an inductor manufacturing method. The method includes the following steps that first, an enameled wire coil is wound; second, first ferromagnetic powder is pressed into a magnetic core; third, the magnetic core is installed in a hollow cavity of the coil; fourth, the coil is installed in an injection mold; fifth, second ferromagnetic powder and high-temperature resin are evenly stirred and mixed power can be obtained; sixth, the mixed powder is injected into the injection mold and formed so that an outer magnet can be obtained, and it is guaranteed that the density of the outer magnet is smaller than that of the magnetic core; seventh, cooling and demolding are performed so that an inductor can be obtained. The inductor manufactured according to the scheme has the advantages that the inductor is good in thermal conductivity and long in service life; the density of the magnetic core is different from that of the outer magnet, a totally-sealed magnetic shielding structure is achieved as a whole, and the EMI effect of the inductor is better compared with that of an existing integrally formed inductor; the problem that a coil is damaged by mechanical stress in the original integrally formed inductor is solved, and in other words, the insulating capacity of the original coil is not weakened.
Description
Technical field
The present invention relates to inductance field, refer to especially a kind of method for manufacturing inductance.
Background technology
Along with the development of electronics industry, in the power supplys such as various Switching Power Supplies, UPS, photovoltaic DC-to-AC converter, wind energy, filter, choke, transformer and reactor etc. are widely used in circuit control system.Filtering, rectification and inversion etc. can be applied to inductor element.
The use of inductor or reactor has vital effect for hyundai electronics industrial expansion, the element that traditional handicraft is made can not be applicable to the development of following miniaturization gradually completely, develop a kind of inductor of high performance miniaturization or reactor to adapt to the high speed development of hyundai electronics science and technology, tool has very great significance.
The process for making of traditional inductor or reactor mainly comprises:
One, magnet ring class magnetic core, the auxiliary threading of artificial threading or machine.This inductance manufacturing process is loaded down with trivial details, and production process cost is high, higher to the coherence request of magnet ring.And most of inductance need to adopt manual or semi-automatic mode at magnetic core surface coiling insulated coil, be difficult for realizing the production automation.For industrial mass production, need to expend more manpower and time, this must also can improve production cost, has limited greatly the development of inductance and the progress of hyundai electronics information technology.Exist in addition 1) electrode pad reliability deficiency, tradition winding power inductance pin is to adopt enamelled wire directly to draw to hang on the sheet bonding with glue such as epoxy resin or round needle type electrode, to be added tin welding again and make its reliable contact good substantially, so, various materials expansions and shrinkage are inconsistent, inductance is operated in and in heating, cooling procedure, causes associated materials to produce differently expanding and shrink, and the time has been grown the abnormal quality hidden danger such as can cause that device bonding pad comes off; 2) inductance can cause its body self-heating cooking because electric current flows through in the course of the work, and under its long-term work body hot conditions, the oxidation of enamelled wire leading-out end and inductance pad hanging wire place solder joint causes inductance open circuit etc. abnormal.
Two, SMD traditional winding power inductance.Its pad overwhelming majority adopts the organic adhesive glue taking epoxy resin as main material that inductance pad and magnetic core body are bonded in to a composition, and while easily causing itself and PCB to mount because of the packaging technology difference of inductance, its Joint Strength exists reliability doubt when poor, the inductance long-term work of coplanarity.
Three, skeleton class ferrite, can the auxiliary coiling of machine and automation.But because the introducing of leakage flux causes coil heating, the temperature derate when method that need to increase the raising such as wire diameter heat radiation is applied is used, and also frequently can produce machinery or electromagnetic resonance noise when inductance work.That is to say inductor or the reactor of this type, on Material Cost due to the existence of reliability requirement, so need to will increase to meet derate on Material Cost.The utilance that the method for segmentation air gap also can only solve part coiling space improves.
Four, " work " font ferrite or alloy type, can be by automated production.Conventional power inductance overwhelming majority product is that employing " work " word magnetic core is that the coiling of main body core material forms, the inevitable bottleneck existing in following application of its structure: 1) inductance anti-dropping capability is undesirable: " work " font induction structure determined that its inductance body edges away from magnetic core center pillar is born and fallen or impact capacity becomes weak, so inductance easily causes magnetic core fragmentation etc. abnormal in the time being subject to dropping shock: 2) in complete machine assembling process, power inductance tiltedly easily causes that at Rig up error or the offset of materials and parts absorption process meta inductance body is damaged abnormal.In addition, " work " font coiling at present quite a few product adopts the lateral grooves of magnetic-conductive adhesive filling magnetic core to strengthen its mechanical strength, reduces leakage field and disturbs.There is following defect in current this magnetic-conductive adhesive embedding structure: 1) in magnetic-conductive adhesive embedding process, unavoidably have the faults of construction such as bubble in application, thereby so cause coil and magnetic-conductive adhesive fully not to contact causing the abnormal case such as the bad and noise of inductance application process coil heat radiation, shorten inductance useful life, make customer service circuit degradation; 2) permeability magnetic material is heated or its expansion and shrinkage and magnetic core and coil inconsistent when cooling, inductance causes glue to come off while work under long term high temperature and large current condition the aspects such as inductance magnetic screen and mechanical property being declined, have reliability quality hidden danger.
Five, traditional winding power inductance, the overwhelming majority adopts the modes such as opening, heat-shrinkable T bush, magnetic-conductive adhesive to form, (mainly make and select according to client's product application conditions, reliable, stability requirement) its structure is not fine to the shield effectiveness of leakage field, when inductance work, cause leakage field to disturb to electromagnetic field sensitive kinds components and parts such as its periphery IC, power modules, thereby make client's properties of product variation, EMI countermeasure cost increases.
Six, traditional winding power inductance is because of the limitation of structure and core material development, its volume of inductor product, overall dimensions for high rated current have been subject to certain limitation, be not suitable for client's high density fabric swatch and to volume and the higher portable type electronic product of space requirement, compare and have some limitations with plate power inductance with the novel lamination growing up.
Seven, Chinese invention patent publication No. CN101552091A has announced a kind of metal powder injection molding inductance and manufacture method thereof, be included in and in enamel wire coil main body hollow cavity, pack magnetic conduction core into and feeromagnetic metal powder is injected to wrap up coil and magnetic conduction core, thereby complete integrated inductance.This method has solved the problem that inductance electric property is poor, production cost is high of prior art to a certain extent.But its electric property still has the space of further lifting, and its heat dispersion is not good, in the situation of working long hours, very easily damages.
Given this, provide a kind of manufacture method of novel high density integral injection molding inductance to necessitate.
Summary of the invention
The present invention proposes a kind of method for manufacturing inductance, has solved that in prior art, inductance electric property is poor, radiating effect is not good and solved the destruction of former one-body molded middle mechanical stress to coil, does not damage or destroy the insulating capacity of primary coil.
Technical scheme of the present invention is achieved in that
A kind of method for manufacturing inductance of the present invention, comprises the following steps:
(1) coiling enamel wire coil in the shape of a spiral;
(2) the first ferromagnetic powder is become to magnetic core by mechanical compaction;
(3) described magnetic core is packed in the hollow cavity of described enamel wire coil;
(4) the described enamel wire coil that described magnetic core is housed is packed in injection molding;
(5) by the second ferromagnetic powder and high-temperature resin glue uniform stirring, obtain mixed powder;
(6) described mixed powder is injected to moulding in the die cavity of described injection molding and obtain outer magnet, and ensure that described outer magnet density is less than described magnetic core density.
(7) cooling, demoulding, obtains moulding inductor.
Further, described outer magnet density is 5.0～6.0g/cm
3.
Further, and ensure that described magnetic core density is 5.5～8.0g/cm3.
Further, complete after described step (7), further comprising the steps of: at described moulding inductor arranged outside radiator.
Further, described radiator is fine aluminium material.
The invention has the beneficial effects as follows: the inductance of manufacturing by such scheme, more traditional inductance has the following advantages:
(1) this method for manufacturing inductance inductance that is formed in one, is embedded in magnetic core the inside by coil, has simplified the production technology of magnetic core;
(2) integrated inductance can be realized automated manufacturing;
(3) adopt integral formation method, the processing of inductance is simpler, thereby has reduced the cost of manufacturing inductor.
And the inductance manufacturing process disclosing compared to prior art has the following advantages:
(1) thermal conductivity is better, long service life;
(2) magnetic core is different from outer magnet density, and entirety realizes Full closed magnetic shielding construction, and the EMI effect of inductance is better than existing integrated inductance.
(3) there is not the destruction of mechanical stress to coil, do not damage or destroy the insulating capacity of coil.
Embodiment
To the technical scheme in the embodiment of the present invention be clearly and completely described below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1:
A kind of method for manufacturing inductance of the present embodiment, comprises the following steps:
(1) by automatic coil winding machine, by enamel wire coil coiling in the shape of a spiral;
(2) the first ferromagnetic powder is pressed into magnetic core by powder compacting press;
(3) magnetic core is packed in the hollow cavity of enamel wire coil;
(4) enamel wire coil that magnetic core is housed is packed in injection molding;
(5) by the second ferromagnetic powder successively with high-temperature resin glue, binding agent uniform stirring, obtain the feeding of mixed powder;
(6) sinter molding in the die cavity of injection injection molding after mixed powder granulation is obtained to outer magnet, and ensure that outer magnet density is less than magnetic core density.
(7) cooling, demoulding, obtains moulding inductor.
(8) at moulding inductor arranged outside radiator.Radiator is fine aluminium material.
In the present embodiment, outer magnet density is 6.0g/cm
3.
And ensure that magnetic core density is 6.5g/cm
3.
Embodiment 2:
In the present embodiment, be different from embodiment 1: outer magnet density is 5.5g/cm
3, magnetic core density is 6.0g/cm
3; Radiator is that pure copper material is made.In the present embodiment, other step is with embodiment 1.
Embodiment 3
In the present embodiment, be different from embodiment 1, outer magnet density is 5.0g/cm
3, magnetic core density is 7.0g/cm
3.In the present embodiment, other step is with embodiment 1.
Embodiment 4
In the present embodiment, be different from embodiment 1, outer magnet density is 6.0g/cm
3, magnetic core density is 8.0g/cm
3.In the present embodiment, other step is with embodiment 1.
Do electric property test with the inductance of method manufacture described in the embodiment 1-4 of same size and the inductance of existing one-body molded manufacture, obtain following data:
The inductance of manufacturing by such scheme, more traditional inductance has the following advantages:
(1) integrated inductance, is embedded in magnetic core the inside by coil, has simplified the production technology of magnetic core;
(2) integrated inductance can be realized automated manufacturing;
(3) adopt integral formation method, the processing of inductance is simpler, thereby has reduced the cost of manufacturing inductor.
And the inductance manufacturing process disclosing compared to prior art has the following advantages:
(1) thermal conductivity is better, long service life;
(2) magnetic core is different from outer magnet density, and entirety realizes Full closed magnetic shielding construction, and the EMI effect of inductance is better than existing integrated inductance.
(3) there is not the destruction of mechanical stress to coil, do not damage or destroy the insulating capacity of coil.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a method for manufacturing inductance, is characterized in that, comprises the following steps:
(1) coiling enamel wire coil in the shape of a spiral;
(2) the first ferromagnetic powder is become to magnetic core by mechanical compaction;
(3) described magnetic core is packed in the hollow cavity of described enamel wire coil;
(4) the described enamel wire coil that described magnetic core is housed is packed in injection molding;
(5) by the second ferromagnetic powder and high-temperature resin glue uniform stirring, obtain mixed powder;
(6) described mixed powder is injected to moulding in the die cavity of described injection molding and obtain outer magnet, and ensure that described outer magnet density is less than described magnetic core density.
(7) cooling, demoulding, obtains moulding inductor.
2. a kind of method for manufacturing inductance according to claim 1, is characterized in that: described outer magnet density is 5.0～6.0g/cm
3.
3. a kind of method for manufacturing inductance according to claim 1, is characterized in that: and ensure that described magnetic core density is 5.5～8.0g/cm
3.
4. a kind of method for manufacturing inductance according to claim 1, is characterized in that: completes after described step (7), and further comprising the steps of: at described moulding inductor arranged outside radiator.
5. a kind of method for manufacturing inductance according to claim 4, is characterized in that: described radiator is fine aluminium material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410415755.8A CN104200981A (en) | 2014-08-20 | 2014-08-20 | Inductor manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410415755.8A CN104200981A (en) | 2014-08-20 | 2014-08-20 | Inductor manufacturing method |
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| CN104200981A true CN104200981A (en) | 2014-12-10 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104835616A (en) * | 2015-05-29 | 2015-08-12 | 深圳市铂科磁材有限公司 | Novel circular-ring-shaped high-power electric reactor and manufacturing method thereof |
| CN104900390A (en) * | 2015-05-29 | 2015-09-09 | 深圳市铂科磁材有限公司 | Novel high density integrated electric inductance manufacturing method |
| WO2016192093A1 (en) * | 2015-06-04 | 2016-12-08 | 深圳市铂科磁材有限公司 | Novel high-density magnetic composite material for inductor |
| WO2016192094A1 (en) * | 2015-06-04 | 2016-12-08 | 深圳市铂科磁材有限公司 | Inductor manufacturing method |
| WO2016192095A1 (en) * | 2015-06-04 | 2016-12-08 | 深圳市铂科磁材有限公司 | Method for manufacturing high-density integrally-molded inductor |
| CN107610879A (en) * | 2017-09-28 | 2018-01-19 | 中国科学院微电子研究所 | Cylindrical inductor and manufacturing method thereof |
| CN111091946A (en) * | 2020-01-21 | 2020-05-01 | 柯昕 | Soft magnetic composite material for fluid filling process |
| CN111668020A (en) * | 2020-06-17 | 2020-09-15 | 深圳市永创星科技有限公司 | Planar transformer and manufacturing process thereof |
| CN111710492A (en) * | 2020-06-11 | 2020-09-25 | 安徽博微新磁科技有限公司 | Perfusion-magnetic combined inductor and preparation method thereof |
| CN114300249A (en) * | 2021-12-31 | 2022-04-08 | 安徽龙磁金属科技有限公司 | Manufacturing method of high-power composite molding inductor |
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| US6137390A (en) * | 1999-05-03 | 2000-10-24 | Industrial Technology Research Institute | Inductors with minimized EMI effect and the method of manufacturing the same |
| JP2002093629A (en) * | 2000-09-19 | 2002-03-29 | Tdk Corp | Surface-mounting coil device and manufacturing method therefor |
| CN101552091A (en) * | 2008-12-31 | 2009-10-07 | 王向群 | Metal powder injection molding inductor and processing method thereof |
| CN202003802U (en) * | 2011-03-18 | 2011-10-05 | 武汉新瑞科电气技术有限公司 | High-frequency inductor |
| CN103489607A (en) * | 2012-06-12 | 2014-01-01 | 司马珍 | Processing and manufacturing method of high-inductance element |
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2014
- 2014-08-20 CN CN201410415755.8A patent/CN104200981A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6137390A (en) * | 1999-05-03 | 2000-10-24 | Industrial Technology Research Institute | Inductors with minimized EMI effect and the method of manufacturing the same |
| JP2002093629A (en) * | 2000-09-19 | 2002-03-29 | Tdk Corp | Surface-mounting coil device and manufacturing method therefor |
| CN101552091A (en) * | 2008-12-31 | 2009-10-07 | 王向群 | Metal powder injection molding inductor and processing method thereof |
| CN202003802U (en) * | 2011-03-18 | 2011-10-05 | 武汉新瑞科电气技术有限公司 | High-frequency inductor |
| CN103489607A (en) * | 2012-06-12 | 2014-01-01 | 司马珍 | Processing and manufacturing method of high-inductance element |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104900390A (en) * | 2015-05-29 | 2015-09-09 | 深圳市铂科磁材有限公司 | Novel high density integrated electric inductance manufacturing method |
| CN104835616A (en) * | 2015-05-29 | 2015-08-12 | 深圳市铂科磁材有限公司 | Novel circular-ring-shaped high-power electric reactor and manufacturing method thereof |
| US10283250B2 (en) | 2015-06-04 | 2019-05-07 | Poco Holding Co., Ltd. | Method for manufacturing high-density integrally-molded inductor |
| WO2016192093A1 (en) * | 2015-06-04 | 2016-12-08 | 深圳市铂科磁材有限公司 | Novel high-density magnetic composite material for inductor |
| WO2016192094A1 (en) * | 2015-06-04 | 2016-12-08 | 深圳市铂科磁材有限公司 | Inductor manufacturing method |
| WO2016192095A1 (en) * | 2015-06-04 | 2016-12-08 | 深圳市铂科磁材有限公司 | Method for manufacturing high-density integrally-molded inductor |
| US20170330662A1 (en) * | 2015-06-04 | 2017-11-16 | Poco Holding Co., Ltd. | Novel high-density magnetic composite material for inductor |
| EP3306629A4 (en) * | 2015-06-04 | 2019-01-23 | Poco Holding Co., Ltd. | Method for manufacturing high-density integrally-molded inductor |
| CN107610879A (en) * | 2017-09-28 | 2018-01-19 | 中国科学院微电子研究所 | Cylindrical inductor and manufacturing method thereof |
| CN111091946A (en) * | 2020-01-21 | 2020-05-01 | 柯昕 | Soft magnetic composite material for fluid filling process |
| CN111710492A (en) * | 2020-06-11 | 2020-09-25 | 安徽博微新磁科技有限公司 | Perfusion-magnetic combined inductor and preparation method thereof |
| CN111668020A (en) * | 2020-06-17 | 2020-09-15 | 深圳市永创星科技有限公司 | Planar transformer and manufacturing process thereof |
| CN111668020B (en) * | 2020-06-17 | 2022-01-28 | 深圳市永创星科技有限公司 | Planar transformer and manufacturing process thereof |
| CN114300249A (en) * | 2021-12-31 | 2022-04-08 | 安徽龙磁金属科技有限公司 | Manufacturing method of high-power composite molding inductor |
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Address after: 518052, 2, 3, 301-306 floor, Fifth Industrial Zone, North Ring Road, Shenzhen, Guangdong, Nanshan District, Nantou Applicant after: POCO HOLDING CO., LTD. Address before: 518052, 2, 3, 301-306 floor, Fifth Industrial Zone, North Ring Road, Shenzhen, Guangdong, Nanshan District, Nantou Applicant before: POCO Magnetic?Co.,?Ltd. |
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Application publication date: 20141210 |