WO2016043310A1 - Bobine inductrice - Google Patents

Bobine inductrice Download PDF

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Publication number
WO2016043310A1
WO2016043310A1 PCT/JP2015/076671 JP2015076671W WO2016043310A1 WO 2016043310 A1 WO2016043310 A1 WO 2016043310A1 JP 2015076671 W JP2015076671 W JP 2015076671W WO 2016043310 A1 WO2016043310 A1 WO 2016043310A1
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WO
WIPO (PCT)
Prior art keywords
coil
inductor
magnetic
resin
winding
Prior art date
Application number
PCT/JP2015/076671
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English (en)
Japanese (ja)
Inventor
祥吾 神戸
島津　英一郎
貴之 小田
Original Assignee
Ntn株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2016043310A1 publication Critical patent/WO2016043310A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00

Definitions

  • the present invention relates to an inductor, and more particularly to an inductor for removing noise used as a magnetic core of a transformer, antenna (bar antenna), choke coil, filter, sensor, etc. under a large current and a high magnetizing force.
  • the current flowing in the circuit has been increased in current and frequency.
  • the inductors used as reactors, choke coils, transformers and the like used in the circuit are also required to cope with high current and high frequency.
  • applications that handle large currents such as converters for solar power generation and wind power generation, data centers, etc. have been expanded, and countermeasures against instantaneous large current noise such as lightning, which is called surge current, have become important for these devices.
  • a magnetic core is inserted inside the winding to increase the amount of generated magnetic flux and reduce the amount of leakage magnetic flux, thereby realizing downsizing and high efficiency of the inductor.
  • a fixed inductor that includes a coil in which an insulating coated wire is wound around a rod-shaped core having either a concave portion or a convex portion on both end faces, and a rectangular sleeve core that houses the coil (Patent Document 1). ).
  • an air core coil device including a frame body, in which a coil terminal of an air core coil is taken out from a notch provided on a side surface of the frame body and the coil terminal is fixed to a mounting substrate (Patent Document 2).
  • an object of the present invention is to provide an inductor capable of forming an efficient magnetic circuit and suppressing noise generation due to magnetic flux leakage to the outside.
  • the inductor of the present invention is characterized in that at least one of a resin body and a magnetic body is disposed outside the coil winding of the coil without disposing a magnetic core inside the coil winding of the coil.
  • the coil winding outer side of the coil is covered with at least one of a resin body and a magnetic body.
  • a coil having no magnetic core is embedded in the resin body.
  • the two lead wires of the coil are drawn in directions that do not overlap each other as viewed from the axial direction around which the coil is wound, or the distance space between the lead ports of the two lead wires of the coil
  • An insulator is disposed on the substrate.
  • a resin body and / or a magnetic body is arranged outside the coil winding without arranging a magnetic core inside the coil winding where the magnetic flux density is highest.
  • an efficient magnetic circuit can be formed with respect to the magnetic flux generated inside the coil winding without magnetic saturation of the magnetic core even under a large current of several thousand A such as a surge current.
  • a magnetic body is disposed outside the coil winding, a magnetic path is formed through the magnetic body, so that it is possible to increase inductance while suppressing noise generation due to magnetic flux leakage to the outside.
  • FIG. 1 is a cross-sectional view of a pot-type inductor as viewed obliquely from above.
  • the lead lines are not shown.
  • the outer side of the wound coil 2 is covered with a magnetic body 3.
  • the magnetic core is not arranged inside the coil winding.
  • the entire coil 2 is embedded in an electrically insulating resin body 4.
  • the resin body 4 can secure the coil 2 and ensure insulation.
  • Reference numeral 5 denotes an abutting surface when the magnetic body 3 is manufactured.
  • the coil 2 is not sealed with the resin body 4 as long as the coil 2 can be secured and insulated with respect to the magnetic body 3 arranged on the outer side of the coil winding. May be arranged inside the magnetic body 3 as an air-core coil.
  • FIG. 2 is an example of a conventional pot-type inductor 1 ′ corresponding to FIG. 1, and is a comparative example in which the magnetic body 3 is arranged on the outer side and the inner side of the wound coil 2.
  • the magnetic permeability decreases and it is difficult to secure a high inductance.
  • FIG. 3A is a top view of the pot type inductor
  • FIG. 3B is a cross-sectional view taken along the line AA.
  • the inductor 1a is a coil in which the coil 2 is arranged inside the resin case 4a and the magnetic core is not arranged inside the coil winding.
  • the coil 2 is a coil obtained by edgewise winding a rectangular insulated winding.
  • the included angle ⁇ between the two lead lines 6a and 6b is set to 180 °. By setting the included angle to 180 ° and arranging the coil 2 in the resin case 4a, withstand voltage, insulation resistance and impulse insulation could be secured.
  • FIG. 4A is a top view of the UU type inductor
  • FIG. 4B is a cross-sectional view taken along the line BB.
  • the inductor 1b is a coil composed of two coils 2 connected at a portion 2a, and magnetic bodies 3a and 3b are arranged above and below the coil in the axial direction. Since there is no magnetic core inside the coil winding, high inductance can be maintained.
  • FIG. 5 shows a BB cross-sectional view of a conventional UU type inductor corresponding to FIG.
  • a coil 2 is wound around a magnetic core made of a magnetic body 3.
  • the magnetic body 3 is disposed, when a large current flows through the coil 2, the magnetic permeability is reduced and it is difficult to secure a high inductance.
  • Magnetic materials that can be used in the present invention include pure iron, iron-silicon alloys, iron-nitrogen alloys, iron-nickel alloys, iron-carbon alloys, iron-boron alloys, iron-cobalt alloys, iron- It can be produced by subjecting the powder surface of a phosphorus alloy, iron-nickel-cobalt alloy, iron-aluminum-silicon alloy (Sendust alloy), amorphous material, fine crystal material, etc. to insulation treatment and compression molding.
  • pure iron is preferable, and reduced iron powder or atomized iron powder used in powder metallurgy is particularly preferable. More preferably, the reduced iron powder is excellent in mechanical properties of the magnetic core obtained.
  • the surface of the magnetic powder particles is preferably coated with an inorganic insulator.
  • an inorganic insulator There is no limitation in particular in the kind of inorganic insulating material, The thing conventionally used in the dust core can be used.
  • preferable insulating materials include metal phosphates such as iron phosphate, manganese phosphate, zinc phosphate, calcium phosphate, and aluminum phosphate, metal oxides such as silicon oxide, magnesium oxide, aluminum oxide, titanium oxide, and zirconium oxide. Things.
  • As a commercial product of iron-based soft magnetic powder coated with an inorganic insulator there is a trade name manufactured by Höganäs; Somaloy.
  • the magnetic substance disposed outside the coil winding is formed by pressure-molding the raw material powder alone with an inorganic insulating coating formed on the particle surface, or a powder in which a thermosetting resin such as an epoxy resin is blended with the raw material powder. It is possible to produce a green compact by firing the green compact.
  • the epoxy resin that can be used in the present invention is preferably a resin that can be used as an adhesive epoxy resin and has a softening temperature of 100 to 120 ° C.
  • an epoxy resin that is solid at room temperature becomes a paste at 50 to 60 ° C., becomes fluid at 130 to 140 ° C., and starts a curing reaction when further heated can be used.
  • the temperature at which the curing reaction is completed within a practical curing time is preferably 170 to 190 ° C. In this temperature range, the curing time is 45 to 80 minutes.
  • Examples of the resin component of the epoxy resin include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, hydrogenated bisphenol A type epoxy resin, hydrogenated bisphenol F type epoxy resin, stilbene type epoxy resin, and triazine skeleton.
  • epoxy resin fluorene skeleton-containing epoxy resin, alicyclic epoxy resin, novolac-type epoxy resin, acrylic epoxy resin, glycidylamine-type epoxy resin, triphenolphenolmethane-type epoxy resin, alkyl-modified triphenolmethane-type epoxy resin, biphenyl-type
  • examples thereof include an epoxy resin, a dicyclopentadiene skeleton-containing epoxy resin, a naphthalene skeleton-containing epoxy resin, and an arylalkylene type epoxy resin.
  • the curing agent component of the epoxy resin is preferably a latent epoxy curing agent.
  • the softening temperature can be set to 100 to 120 ° C, and the curing temperature can be set to 170 to 190 ° C. Formation of an insulating coating on iron powder and subsequent compression Molding and thermosetting can be performed.
  • the latent epoxy curing agent include dicyandiamide, boron trifluoride-amine complex, and organic acid hydrazide. Of these, dicyandiamide that meets the above-mentioned curing conditions is preferred.
  • hardening accelerators such as tertiary amine, an imidazole, and an aromatic amine
  • curing agent can be included with a latent epoxy hardening
  • the epoxy resin containing the latent curing agent is latent so that the curing conditions are 160 ° C. for 2 hours, 170 ° C. for 80 minutes, 180 ° C. for 55 minutes, 190 ° C. for 45 minutes, and 200 ° C. for 30 minutes. Add a functional curing agent.
  • the compounding ratio of the iron-based soft magnetic powder whose surface is treated with the inorganic insulating coating and the epoxy resin is 95 to 99% by mass of the iron-based soft magnetic powder and the latent hardener based on the total amount of these.
  • the resin is 1 to 5% by mass. This is because if the epoxy resin is less than 1% by mass, it is difficult to form an insulating coating, and if it exceeds 5% by mass, the magnetic properties are degraded and a resin-rich coarse aggregate is generated.
  • the magnetic substance disposed outside the coil winding is obtained by dry-mixing the iron-based soft magnetic powder whose surface is treated with an inorganic insulating coating and the epoxy resin at a temperature of 100 to 120 ° C.
  • An uncured resin film is formed on the inorganic insulating film formed on the surface of the magnetic powder.
  • An iron-based soft magnetic powder with an insulating coating formed on its surface is formed into a compact by compression molding using a mold, and then heat-cured at a temperature equal to or higher than the thermal curing start temperature of the epoxy resin. The body is obtained.
  • the magnetic body 3 can also be manufactured by blending a binder resin with iron-based soft magnetic powder and injection molding the mixture.
  • a binder resin a thermoplastic resin capable of injection molding can be used.
  • Thermoplastic resins include polyolefins such as polyethylene and polypropylene, polyvinyl alcohol, polyethylene oxide, polyphenylene sulfide (PPS), liquid crystal polymer, polyether ether ketone (PEEK), polyimide, polyether imide, polyacetal, polyether sulfone, and polysulfone.
  • polyphenylene sulfide is excellent in fluidity at the time of injection molding when mixed with iron-based soft magnetic powder, and the surface of the molded article after injection molding can be covered with a resin layer and has excellent heat resistance and the like.
  • PPS polyphenylene sulfide
  • the ratio of the raw material powder is preferably 80 to 95% by mass, where the total amount of the raw material powder and the thermoplastic resin is 100% by mass. If it is less than 80% by mass, magnetic properties cannot be obtained, and if it exceeds 95% by mass, the injection moldability is poor.
  • a method of injecting and molding the raw material powder into a mold in which a movable mold and a fixed mold are abutted can be used.
  • the above-mentioned binder resin can be used for the resin insulator that is disposed outside the coil winding and covers the coil.
  • thermosetting resins such as an epoxy resin or a phenol resin, can be used.
  • a copper enameled wire can be used, and the types thereof are urethane wire (UEW), formal wire (PVF), polyester wire (PEW), polyesterimide.
  • a wire (EIW), a polyamideimide wire (AIW), a polyimide wire (PIW), a double coated wire combining these, a self-bonding wire, a litz wire, or the like can be used.
  • a round wire or a square wire can be used as the cross-sectional shape of the copper enamel wire.
  • edgewise winding, helical winding, and toroidal winding of a flat enameled wire can be adopted. In the present invention, edgewise winding of a rectangular enameled wire is preferable.
  • thermoplastic resin capable of injection molding examples include the thermoplastic resins described as the binder resin.
  • PPS polyphenylene sulfide
  • Injection molding can be performed by, for example, a method in which a movable mold and a fixed mold are abutted and the resin body 4 is injected into a mold in which the coil 2 is placed.
  • the injection molding conditions vary depending on the type of thermoplastic resin.
  • the resin temperature is preferably 290 to 350 ° C. and the mold temperature is preferably 100 to 150 ° C.
  • the epoxy resin used as a binder for the magnetic body 3 or a thermosetting resin such as a phenol resin can be used.
  • the inductor of the present invention shown in FIG. 1 is obtained by press-fitting a resin body 4 in which a coil 2 is embedded into a magnetic body 3 that is divided into two vertically in the sectional view shown in FIG.
  • the two divided magnetic bodies 3 are bonded to each other at the abutting surface 5 using a solventless epoxy adhesive or the like.
  • the inductor according to the present invention can suppress a decrease in inductance even when a large current flows into the coil 2, and by adopting a specific form for the lead wire, two inductors can be connected even if a large current flows. Insulation between the lead wires can be ensured.
  • Two lead wire configurations are shown in FIGS. 6 and 7 are diagrams in the case where the two lead wires of the coil are separated from each other in a direction not overlapping each other when viewed from the axial direction in which the coil is wound, and FIG. 8 is a diagram between the two lead wires of the coil. It is a figure in the case of arranging an insulator on.
  • FIG. 6 is a diagram showing a form 1 of the lead wire
  • FIG. 6 (a) is a top view of the inductor
  • FIG. 6 (b) is a front view thereof
  • FIG. 6 (c) is a side view example thereof.
  • the inductor 1 is composed of a coil (not shown in the figure) in which the magnetic body 3 is embedded around the resin body 4 without arranging a magnetic core inside the coil winding, Two lead wires 6a and 6b are drawn out from the coil terminal.
  • the lead wires 6a and 6b are drawn and fixed in directions that do not overlap each other, such as an angle of 180 ° when viewed from the axial direction around which the coil is wound, so that insulation can be ensured by the distance space. .
  • FIGS. 7A and 7B are diagrams showing a second form of the lead line, in which FIG. 7A shows an inductor top view, FIG. 7B shows the same front view, and FIG. 7C shows the same side view example.
  • the inductor 1 is composed of a coil (not shown in the figure) in which the magnetic body 3 is embedded around the resin body 4 without arranging a magnetic core inside the coil winding, Two lead wires 6c and 6d are led out from the coil terminal.
  • the lead wires 6c and 6d are drawn in the same direction as seen from the axial direction of the coil in the top view, but are separated into an upper stage and a lower stage of the coil axis and do not overlap with each other as seen from the axial direction of the coil. Insulating properties can be ensured by the distance space. Since the inductor shown in FIG. 7 can be provided at a greater distance from the coil wire outlet than the inductor shown in FIG. 6, it is easy to ensure insulation.
  • FIG. 8A and 8B are views showing the lead wire configuration 3
  • FIG. 8A shows an inductor top view
  • FIG. 8B shows the same front view
  • FIG. 8C shows the same side view example.
  • the inductor 1 is composed of a coil (not shown in the figure) in which the magnetic body 3 is embedded around the resin body 4 without arranging a magnetic core inside the coil winding, Two lead wires 6e and 6f are drawn out from the coil terminal.
  • the insulators 7 are disposed in the distance space between the two lead wires 6e and 6f of the two lead wires. By this insulator 7, the insulation between lines is further enhanced.
  • the insulator 7 is not particularly limited, and an inorganic insulator such as ceramic or an organic insulator such as synthetic resin can be used.
  • the inductor of the present invention is not easily magnetically saturated with a coil having no magnetic core inside the coil winding, and can maintain a high inductance even when a large magnetic field is generated. ), Can be used as an inductor for removing noise in a choke coil, filter, sensor, or the like. In particular, it can be suitably used as an inductor used in a surge countermeasure circuit.
  • FIG. 9 An example of a surge countermeasure circuit is shown in FIG. FIG. 9 is an example in which an inductor is arranged in series between two voltage clamping devices.
  • the inductor 1 By arranging the inductor 1 in series with the clamping devices 8a and 8b so as to clamp the voltage from the input side to a protected circuit device serving as an electrical load, a voltage surge due to lightning can be prevented.
  • the inductor of the present invention is effective for voltage surges because the inductance change rate is small in the range of high magnetizing force.
  • Example 97.3 g of iron powder particles whose surface is covered with an inorganic insulating coating (Homanes, Somaloy: insulating coating-treated iron powder) and 2.7 g of epoxy resin powder containing dicyandiamide as a curing agent are used in a blender. And mixed for 10 minutes at room temperature.
  • the iron powder particles used were particles that passed through a sieve having a sieve opening of 106 ⁇ m and did not pass through a 25 ⁇ m sieve.
  • the mixture was put into a kneader and heated and kneaded at 110 ° C. for 15 minutes.
  • the cake agglomerated from the kneader was taken out and cooled, and then pulverized with a pulverizer.
  • the magnetic body 3 is a pot type having an inner diameter of 96 mm, an outer diameter of 120 mm, an inner dimension of 26 mm, and an outer dimension of 36 mm.
  • a flat insulated winding having a width and thickness of 19 ⁇ 1.2 mm was prepared, and this was edgewise wound to produce a coil having an inner diameter of 52 mm, an outer diameter of 83 mm, and a height of 56 mm.
  • a resin body capable of fixing the coil to a size that fits in the core was prepared, and the coil was placed on a case and sealed with resin.
  • the lead wire was fixed with a resin sealing material.
  • the obtained resin body was inserted into the pot-type magnetic body 3 to produce the inductor shown in FIG.
  • an inductor shown in FIG. 2 was manufactured using the same material as in the example except that a pot-type magnetic body having a protrusion at the center was used.
  • the inductance of Examples and Comparative Examples was measured with an LCR meter while changing the magnetizing force. The results are shown in FIG. As shown in FIG. 10, in the comparative example, the inductance is remarkably reduced as the magnetizing force increases. Usually, since the inductance change rate is used within 30%, the comparative example cannot be used at about 10 kA / m or more. In the choke coil of the present invention, there was almost no decrease in inductance even when the choke coil was increased to 150 kA / m, and a choke coil having a stable inductance in a wide range was obtained.
  • the inductor of the present invention has a small inductance change rate in the range of high magnetizing force, it can be used as an inductor for electrical equipment that requires high current and high frequency.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

　L'invention concerne une bobine inductrice avec laquelle il est possible de former un circuit magnétique efficace pour un flux magnétique généré sur la partie intérieure d'un fil de bobinage, et de supprimer la génération de bruit dû à une fuite du flux magnétique vers l'extérieur, sans permettre à un noyau magnétique d'atteindre la saturation magnétique même à un courant électrique élevé. Cette bobine inductrice 1 comporte un élément de résine 4 et/ou un élément magnétique 3 disposé sur le côté extérieur de l'enroulement de bobine d'une bobine 2, sans qu'un noyau magnétique ne soit disposé sur le côté interne de l'enroulement de bobine de la bobine 2. En particulier, le côté extérieur de l'enroulement de bobine de la bobine est recouvert par l'élément de résine 4 et/ou l'élément magnétique 3.
PCT/JP2015/076671 2014-09-19 2015-09-18 Bobine inductrice WO2016043310A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014191839A JP2016063158A (ja) 2014-09-19 2014-09-19 インダクタ
JP2014-191839 2014-09-19

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WO2016043310A1 true WO2016043310A1 (fr) 2016-03-24

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6332159B2 (ja) * 2015-06-19 2018-05-30 株式会社村田製作所 表面実装インダクタ及びその製造方法
WO2018235550A1 (fr) 2017-06-19 2018-12-27 株式会社村田製作所 Composant de bobine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH118142A (ja) * 1997-06-18 1999-01-12 Tokin Corp 電子部品
JP2002050526A (ja) * 2000-08-03 2002-02-15 Densei Lambda Kk インダクタンス素子とその製造方法
JP2002280232A (ja) * 2001-03-19 2002-09-27 Mitsubishi Electric Corp 空芯コイル装置
JP2010524422A (ja) * 2007-04-05 2010-07-15 ジョージア テック リサーチ コーポレーション 電圧サージ及び過電圧の保護
JP2014041962A (ja) * 2012-08-23 2014-03-06 Kobe Steel Ltd ノイズ低減用巻線素子

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4654317B1 (ja) * 2009-07-16 2011-03-16 株式会社神戸製鋼所 リアクトル
JP2011238699A (ja) * 2010-05-07 2011-11-24 Daido Steel Co Ltd ケース付リアクトルの製造方法及びケース付リアクトル
JP5149976B2 (ja) * 2011-04-06 2013-02-20 株式会社神戸製鋼所 リアクトルおよびその設計方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH118142A (ja) * 1997-06-18 1999-01-12 Tokin Corp 電子部品
JP2002050526A (ja) * 2000-08-03 2002-02-15 Densei Lambda Kk インダクタンス素子とその製造方法
JP2002280232A (ja) * 2001-03-19 2002-09-27 Mitsubishi Electric Corp 空芯コイル装置
JP2010524422A (ja) * 2007-04-05 2010-07-15 ジョージア テック リサーチ コーポレーション 電圧サージ及び過電圧の保護
JP2014041962A (ja) * 2012-08-23 2014-03-06 Kobe Steel Ltd ノイズ低減用巻線素子

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