WO2003102978A1 - Procede de fabrication d'une bobine de reactance - Google Patents

Procede de fabrication d'une bobine de reactance Download PDF

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Publication number
WO2003102978A1
WO2003102978A1 PCT/KR2002/001051 KR0201051W WO03102978A1 WO 2003102978 A1 WO2003102978 A1 WO 2003102978A1 KR 0201051 W KR0201051 W KR 0201051W WO 03102978 A1 WO03102978 A1 WO 03102978A1
Authority
WO
WIPO (PCT)
Prior art keywords
high polymer
core
polymer resin
compound
magnetic
Prior art date
Application number
PCT/KR2002/001051
Other languages
English (en)
Inventor
Young Kwon
Byeong Hwa Chung
Original Assignee
Lg Electronics Inc.
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 Lg Electronics Inc. filed Critical Lg Electronics Inc.
Priority to PCT/KR2002/001051 priority Critical patent/WO2003102978A1/fr
Priority to AU2002303020A priority patent/AU2002303020A1/en
Publication of WO2003102978A1 publication Critical patent/WO2003102978A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
    • 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
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F17/062—Toroidal core with turns of coil around it
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures

Definitions

  • the present invention relates to a reactor, and more particularly, to a method for fabricating a reactor with a compound core.
  • a reactor is to rectify overcurrent and includes one core provided with one coil and a plastic case for insulation between the core and the coil.
  • FIG. 1 illustrates a general process of fabricating a 15 reactor. As shown in FIG. 1, the reactor is fabricated by assembling a core and a plastic case into each other.
  • the core is fabricated using silicon steel sheets or a coated metallic powder.
  • the core based on silicon steel sheets is fabricated 20 by several silicon steel sheet layers which are formed by rolling.
  • the core based on metallic powder is fabricated by respectively coating metal particles, such as Fe-Ni alloy, with high polymer and sintering them at high pressure. ⁇ 25.
  • the plastic case is molded by injection in a certain form using an injector.
  • the fabricated core is assembled into the fabricated plastic case, and then the coil is wound on the plastic case, thereby finishing a reactor.
  • the related art method for fabricating a reactor has several problems.
  • the present invention is directed to a method for fabricating a reactor that substantially obviates one or more problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide a method for fabricating a reactor that facilitates the fabricating process and has improved characteristics by using a compound material capable of carrying out injection molding.
  • Another object of the present invention is to provide a method for fabricating a reactor that can enable mass production and save the fabricating cost by carrying out successive process steps.
  • the method includes a) respectively preparing a compound and a second high polymer resin, the compound being produced by mixing a magnetic powder of a certain size with a first high polymer resin at a constant ratio, and the second high polymer resin having certain viscosity, b) molding the compound into the core, c) molding the core into the case by injecting the second high polymer resin on an outer surface of the core, and d) winding a coil on the surface of the case.
  • the step a) includes al) preparing the magnetic powder of a certain size and the first high polymer resin, a2) treating the magnetic powder with heat, and a3) mixing the magnetic powder treated with heat with the first high polymer resin at a constant ratio.
  • the step b) includes bl) extruding the compound in a predetermined bar form, b2) cutting the extruded bar shaped compound into pieces of a certain size, and b3) injecting the piece shaped compound in the core form.
  • the step c) -includes cl) inserting the molded core into the molded case, and c2) injecting the case by injecting the second high polymer resin into the mold.
  • the process steps can be simplified, mass production can be realized, and performance of the product can be improved.
  • FIG. 1 illustrates a related art process of fabricating a reactor
  • FIG. 2 illustrates a process of fabricating a reactor according to the present invention
  • FIG. 3 is a flow chart illustrating a method for fabricating a reactor according to the present invention.
  • the present invention is intended to fabricate a reactor suitable for mass production by simplifying the process steps by successively injecting a core and a case from one injector.
  • the core is based on a compound produced by mixing a magnetic powder with a high polymer resin at a constant ratio and is covered with the case.
  • FIG. 2 illustrates a process of fabricating a reactor according to the present invention
  • FIG-. 3 is a flow chart illustrating a method for fabricating a reactor according to the present invention.
  • a magnetic powder of a certain size and first and second high polymer resins are prepared (Sll) .
  • a hardening magnetic powder as well as a soft magnetic powder may be used as the magnetic powder.
  • an oxide-based magnetic fine powder, a metallic-based magnetic fine powder, a synthetic ferrite fine powder, or a magnetite fine powder may be used as the magnetic powder.
  • the oxide-based magnetic fine powder includes a magnetic iron oxide, a cobalt-containing magnetic iron oxide, a chromium-containing magnetic iron oxide, or chrome oxide.
  • the metallic-based magnetic fine powder includes an iron-based fine powder, a nickel-based fine powder, a cobalt-based fine powder, or a silicon- based fine powder.
  • the metallic-based fine powder may lose magnetism as its surface is likely to be oxidized. Accordingly, it is preferable that an oxidized membrane is in advance formed on the surface of the metal so as not to oxidize the surface.
  • the magnetic force of the oxide-based magnetic body is. within the range of 100 ⁇ 1000 Oe.
  • the magnetic force of the metallic-based magnetic body is within the range of 500-2000 Oe.
  • the magnetic powder has a size within the range of l ⁇ ⁇ lOO ⁇ m. More preferably, all the magnetic powders have an equal size.
  • the first and second high polymer resins may be selected from any one of polyethylene, polypropylene, PVC, phenol resin, nylon, silicon resin, rubber, polyester, polystyrene, and acrylonitrile- butadiene-styrene (ABS) .
  • the first and second high polymer resins may be of either the same material or different materials .
  • the first high polymer resin and the second high polymer resin may have different characteristics, for example, in viscosity.
  • the magnetic powder is treated with heat at a temperature between 900°C and 1500°C (S12), so that its characteristics may be prevented from being deteriorated by external stress.
  • the magnetic powder treated with heat is mixed with the first high polymer resin at a constant ratio to produce a compound (S13) .
  • the magnetic powder in the compound has a content of 85 ⁇ 95wt%. If. the content of the first high polymer resin is too smaller than that of the magnetic powder, the product is not molded in the process of injection. On the other hand, if the content of the first high polymer resin is too greater than that of the magnetic powder, the magnetic characteristic is remarkably reduced. Accordingly, it is necessary that the magnetic powder is appropriately mixed with the first high polymer resin.
  • the mixed ratio of the magnetic powder and the high polymer resin may depend on types of each material.
  • the compound produced by mixing the magnetic powder with the first high polymer resin is extruded in a bar form having a predetermined length, and the extruded bar shaped compound is cut into pieces of a certain size (S14) .
  • the piece shaped compound is molded by injection to fabricate a core (S15) .
  • stearic acid of about 1% that acts as a lubricant is added to the compound.
  • bubbles may occur if moisture exists in the compound, the compound is molded after drying for four hours at a temperature of about 100°C.
  • the core is inserted into a case type mold so that the case for insulation is molded on an outer surface of the core, and the second high polymer resin is injected into the mold to mold the case by injection (S16) .
  • a coil is wound on the molded case to finish a reactor (S18) .
  • the method for fabricating a reactor has the following advantages.
  • the fabricating cost can be reduced.
  • the product having various shapes can be obtained by simply varying the molding type.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'une bobine de réactance. Le procédé consiste : a) à préparer un composé et une seconde résine de haut polymère, le composé étant produit par mélange d'une poudre magnétique d'une certaine dimension avec une première résine de haut polymère selon un rapport constant, et la seconde résine de haut polymère possédant une certaine viscosité ; b) à mouler le composé en noyau ; c) à mouler le noyau dans le boîtier en injectant la seconde résine de haut polymère sur une surface extérieure du noyau ; et d) à former une bobine autour de la surface du boîtier. Le procédé de l'invention permet de faciliter le processus de fabrication et il permet la production en masse.
PCT/KR2002/001051 2002-06-03 2002-06-03 Procede de fabrication d'une bobine de reactance WO2003102978A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/KR2002/001051 WO2003102978A1 (fr) 2002-06-03 2002-06-03 Procede de fabrication d'une bobine de reactance
AU2002303020A AU2002303020A1 (en) 2002-06-03 2002-06-03 Method for fabricating reactor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2002/001051 WO2003102978A1 (fr) 2002-06-03 2002-06-03 Procede de fabrication d'une bobine de reactance

Publications (1)

Publication Number Publication Date
WO2003102978A1 true WO2003102978A1 (fr) 2003-12-11

Family

ID=29707654

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2002/001051 WO2003102978A1 (fr) 2002-06-03 2002-06-03 Procede de fabrication d'une bobine de reactance

Country Status (2)

Country Link
AU (1) AU2002303020A1 (fr)
WO (1) WO2003102978A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150015359A1 (en) * 2013-07-15 2015-01-15 Samsung Electro-Mechanics Co., Ltd. Soft magnetic composite, method for preparing the same, and electronic components including the same as core material

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0977216A1 (fr) * 1998-07-29 2000-02-02 TDK Corporation Poudre ferromagnétique pour noyau en poudre,noyau en poudre,et procédé de fabrication d' un noyau en poudre
EP1077454A1 (fr) * 1999-02-10 2001-02-21 Matsushita Electric Industrial Co., Ltd. Materiau magnetique composite

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0977216A1 (fr) * 1998-07-29 2000-02-02 TDK Corporation Poudre ferromagnétique pour noyau en poudre,noyau en poudre,et procédé de fabrication d' un noyau en poudre
EP1077454A1 (fr) * 1999-02-10 2001-02-21 Matsushita Electric Industrial Co., Ltd. Materiau magnetique composite

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150015359A1 (en) * 2013-07-15 2015-01-15 Samsung Electro-Mechanics Co., Ltd. Soft magnetic composite, method for preparing the same, and electronic components including the same as core material

Also Published As

Publication number Publication date
AU2002303020A1 (en) 2003-12-19

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