WO2004069536A1 - Magnetic implement using magnetic metal ribbon coated with insulator - Google Patents
Magnetic implement using magnetic metal ribbon coated with insulator Download PDFInfo
- Publication number
- WO2004069536A1 WO2004069536A1 PCT/US2003/039980 US0339980W WO2004069536A1 WO 2004069536 A1 WO2004069536 A1 WO 2004069536A1 US 0339980 W US0339980 W US 0339980W WO 2004069536 A1 WO2004069536 A1 WO 2004069536A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic
- implement
- recited
- insulator
- core
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
- H01F1/18—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets with insulating coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/04—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a layer being specifically extensible by reason of its structure or arrangement, e.g. by reason of the chemical nature of the fibres or filaments
-
- 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
- H01F27/24—Magnetic cores
- H01F27/25—Magnetic cores made from strips or ribbons
-
- 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
- H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
- H01F41/0226—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) from amorphous ribbons
-
- 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
- H01F41/0233—Manufacturing of magnetic circuits made from sheets
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12465—All metal or with adjacent metals having magnetic properties, or preformed fiber orientation coordinate with shape
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12556—Organic component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12597—Noncrystalline silica or noncrystalline plural-oxide component [e.g., glass, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12611—Oxide-containing component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
- Y10T428/31681—Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/32—Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer
Definitions
- This invention relates to magnetic implements for cores of transformers and inductors; and more particularly, to a magnetic implement composed of metal alloy ribbon coated with an electrical insulator and adapted for use in transformer and inductor cores that operate at high frequencies.
- Magnetic cores are widely used electric power transformers that carry electrical current at low frequencies; typically less than 500 Hz. When a transformer is operated at a given frequency, it loses energy, owing in part to its magnetic loss.
- the proportionality coefficient for the eddy-current loss is proportional to the square of the core material thickness.
- electrically insulated, thinner magnetic materials result in lower eddy-current losses.
- Magnetic materials often used as core materials come in ribbon or sheet forms, which are convenient to form tape-wound or stacked cores. Recent advances made in forming magnetic ribbons and sheets include amorphous materials. These materials are conveniently produced using the teachings of U.S. Reissue Patent RE 32925. When a magnetic core is used at high frequencies, a better or more secure surface coating becomes necessary to ascertain effective electrical insulation between magnetic materials.
- a thin, non-conductive insulator such as paper, polymer films and the like has been commonly used for such purposes.
- sufficient dielectric properties are needed for the insulator materials.
- Low dielectric constants and high dielectric breakdown voltages are generally preferred. These features become increasingly important when the magnetic components are operated at high frequencies and high voltages.
- the magnetic metal-insulator-magnetic metal configuration just described is widely used, the process for manufacturing that configuration is fraught with problems. Such a manufacturing process requires a special apparatus, in which a magnetic metal and an insulator in ribbon or sheet form are co-wound to produce a magnetic component having the form of a wound core.
- the magnetic metal-insulator-magnetic metal configuration can also be produced by an apparatus wherein a magnetic metal and an insulator are alternately juxtaposed to form a stacked core. Co-winding processes of the type described oftentimes result in punctured or torn insulators because of the sharpness of the magnetic metal ribbon or sheet.
- the present invention provides a thermally insulated magnetic implement having an improved combination of magnetic properties.
- a ferromagnetic ribbon or sheet is coated with an insulator prior to formation of a magnetic implement.
- Manufacture of the magnetic implement is accomplished in a single process without need for co-winding magnetic and insulator ribbons. Thermal property differences between the magnetic material and the insulator operate during heat treatment to enhance magnetic property modification of the implement.
- the present invention provides a method for fabrication a magnetic implement that reliably juxtaposes electrical insulation between metallic magnetic materials and simultaneously tailors magnetic properties of the implement to achieve a desired magnetic performance.
- the electrical insulation material applied to the surfaces of the magnetic material during fabrication of the magnetic implement is readily available in liquid form. It is coated on the magnetic material by brushing the liquid insulator thereon or passing the magnetic material through a liquid insulator bath. After the insulation material dries out, the coated magnetic material is fabricated into a magnetic implement by winding or stacking the material. The fabricated implement is then heat-treated to modify or improve its magnetic properties.
- the magnetic implement comprises a magnetic core composed of a magnetic ribbon or sheet coated with an electrical insulator having divergent dielectric properties and thicknesses.
- a metallic magnetic material in ribbon or sheet form is selected in light of the performance specification required for the implement. Electrical insulation properties for the insulation material, such as dielectric properties and breakdown voltages are then determined. A candidate insulation material is selected and applied on the magnetic material surfaces. Selection of the magnetic metal and the candidate insulation material is governed by certain criteria, including the difference between the thermal expansion coefficients of the metal and insulating materials. This thermal expansion coefficient difference significantly affects magnetic performances of the heat-treated implements.
- the magnetic implements thus fabricated are especially well suited for use in pulse transformers, signal or current metering transformers, electrical chokes and high frequency electrical transformers.
- Fig. 1 is a graph illustrating the magnetization behavior of a core constructed in accordance with the present invention, the magnetic flux being shown as a function of the applied field for a core composed of cobalt-based METGLAS® 2705M ribbon, the core having the dimensions
- ODxIDxHT 102x58x25 mm, and having been heat-treated at 335 °C for 2
- Fig. 2 is a graph illustrating the BH magnetization behavior taken at DC for a prior
- Fig. 3 is a graph depicting core loss measured at 0.1 T induction as a function of frequency for the core of Fig. 1 and the prior art core of Fig. 2;
- Fig. 4 is a graph illustrating the BH magnetization behaviors taken at DC for two
- cores of the present invention composed of iron-based METGLAS®
- Fig. 5 depicts the BH magnetization behavior taken at DC for a prior art core
- Fig. 6 is a graph depicting inductance as a function of DC bias for the cores of Fig.4A;
- Fig. 7 is a graph depicting inductance as a function of frequency for the cores of Fig.4A.
- the coating thickness ranges from about 2 to 4.
- the dielectric constant of the coated insulator is about 3.9.
- the cores were heat-treated at temperatures ranging from about 300 °C to 350 °C for 1-5 hours. This heat-treatment temperature range is selected because the alloy's Curie temperature is about 350 °C.
- a DC field of about 1 kOe (80 kA/m) is applied along the core's axis direction to achieve a linear BH behavior.
- permeability of the core is about 1,800 at this frequency.
- the relatively- linear BH behavior of the core is only restricted to a low applied field of about 0.05 Oe (4 A/m), with the remanence, B r , of about 1.5 kG (0.15T) and coercivity, H c , of 60 mOe (4.8 A/m).
- the curved BH property shown in Fig. 2 is suited for certain kinds of electrical chokes, but not for pulse and signal transformers.
- a comparison of Figs. 1 and 2 indicates that the polyimide coating on the surface of the ribbon helps to develop a magnetic anisotropy along the core's axis direction, resulting in the linear BH behavior of Fig. 1.
- the insulator coating prior to the core fabrication is effective in achieving the desired magnetic properties.
- the electrical insulation also helps to reduce eddy current losses of the magnetic core.
- a low dielectric constant of about 3.9 of the polyimide insulator is responsible for the reduced component loss at high frequencies, resulting in a relatively high AC permeability of about 1800 at 800 kHz.
- Data set forth in Fig. 3 represents a direct comparison of the frequency dependence of the core loss between a core of the present invention (shown in Fig. 1) and a core of the prior art (shown in Fig. 2). It is evident that the core of the present invention has a lower core loss above about 50 kHz, as compared to a prior art core made from the same material.
- the core data illustrated by Figs. 1 and 2 are for near-zero magnetostrictive alloys, which tend to be less subject to stresses developed during heat-treatments.
- stress developed throughout the interface between ribbon and insulator due to the thermal expansion coefficient difference between the two materials plays an important role in the final magnetic state of the core.
- Fig. 4 there are shown BH loops taken on examples wherein a positively
- FIG. 6 wherein inductance of an inductor having the core of Fig. 4 A with a 10- turn winding is plotted against applied field.
- Data contained by Fig. 6 indicates that an inductor core of the present invention is useful as an electrical choke.
- the frequency dependence of the inductance of the same inductor is shown in Fig. 7.
- the relatively constant inductance vs. frequency up toward 1 MHz is the result of the polyimide insulator coating on the surface of the ribbon used; such insulator reduces the eddy current loss in the core material.
- this inductor can be used as a choke coil up to about 1 MHz.
- the core showing the BH behavior of Fig. 4B is suited for electrical transformers used in high frequencies such as the main transformers in switch- mode power supplies.
- 2605S3A ribbon having widths of about 25 mm are coated with polyimide.
- the amorphous ribbons ranges from 16-25 ⁇ m, while the polyimide layers are 2-4 ⁇ m thick.
- the wound cores are heat-treated at 300-400 °C for 1-5 hours with or without magnetic fields applied along the toroid's axis (or transverse) and circumference (longitudinal) directions. In the transverse and longitudinal field cases, the field strengths are about 1 kOe (80 kA/m) and about 20 Oe (1.6 kA/m), respectively.
- Cores using uncoated ribbon are prepared in the same way. Some of these cores are co-wound with Mylar films.
- each core has 20 copper winding turns in the primary and secondary coils.
- a commercially available BH hysteresigraph is used to generate DC hysteresis loops on the cores.
- Figs. 1, 2, 4 and 5 are representative of the BH
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03815776A EP1594688A4 (en) | 2003-01-30 | 2003-12-10 | Magnetic implement using magnetic metal ribbon coated with insulator |
AU2003300955A AU2003300955A1 (en) | 2003-01-30 | 2003-12-10 | Magnetic implement using magnetic metal ribbon coated with insulator |
JP2004568029A JP5372312B2 (en) | 2003-01-30 | 2003-12-10 | Magnetic article using magnetic metal ribbon coated with insulator |
KR1020057014006A KR101143014B1 (en) | 2003-01-30 | 2003-12-10 | Magnetic implement using magnetic metal ribbon coated with insulator |
HK06108596A HK1088281A1 (en) | 2003-01-30 | 2006-08-02 | Magnetic implement using magnetic metal ribbon coated with insulator |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/354,791 | 2003-01-30 | ||
US10/354,791 US7056595B2 (en) | 2003-01-30 | 2003-01-30 | Magnetic implement using magnetic metal ribbon coated with insulator |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004069536A1 true WO2004069536A1 (en) | 2004-08-19 |
Family
ID=32770421
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2003/039980 WO2004069536A1 (en) | 2003-01-30 | 2003-12-10 | Magnetic implement using magnetic metal ribbon coated with insulator |
Country Status (9)
Country | Link |
---|---|
US (2) | US7056595B2 (en) |
EP (1) | EP1594688A4 (en) |
JP (2) | JP5372312B2 (en) |
KR (1) | KR101143014B1 (en) |
CN (1) | CN100537218C (en) |
AU (1) | AU2003300955A1 (en) |
HK (1) | HK1088281A1 (en) |
TW (1) | TWI328511B (en) |
WO (1) | WO2004069536A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006019613B4 (en) * | 2006-04-25 | 2014-01-30 | Vacuumschmelze Gmbh & Co. Kg | Magnetic core, process for its preparation and its use in a residual current circuit breaker |
KR101399021B1 (en) | 2012-02-03 | 2014-05-27 | 주식회사 아모센스 | Magnetic Shielding Sheet for Digitizer, Manufacturing Method thereof, and Portable Terminal Equipment Using the Same |
EP2858470B1 (en) | 2012-06-04 | 2023-04-12 | Amosense Co., Ltd. | Magnetic field shielding sheet for digitizer, method for manufacturing same, and portable terminal device using same |
CN109338087A (en) * | 2018-11-14 | 2019-02-15 | 王静然 | A kind of processing method of amorphous band |
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US4808464A (en) * | 1987-07-23 | 1989-02-28 | Westinghouse Electric Corp. | Insulating ferromagnetic amorphous metal strips |
JPH01289228A (en) * | 1988-05-17 | 1989-11-21 | Matsushita Electric Ind Co Ltd | Noise filter |
US4983859A (en) * | 1988-08-25 | 1991-01-08 | Hitachi Metals, Ltd. | Magnetic device for high-voltage pulse generating apparatuses |
JPH03208406A (en) * | 1990-01-10 | 1991-09-11 | Toshiba Corp | Noise filter element |
US5470646A (en) * | 1992-06-11 | 1995-11-28 | Kabushiki Kaisha Toshiba | Magnetic core and method of manufacturing core |
US5639566A (en) * | 1990-09-28 | 1997-06-17 | Kabushiki Kaisha Toshiba | Magnetic core |
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USRE32925E (en) | 1972-12-26 | 1989-05-18 | Allied-Signal Inc. | Novel amorphous metals and amorphous metal articles |
JPS59181504A (en) * | 1983-03-31 | 1984-10-16 | Toshiba Corp | Constant permeability core |
US4845454A (en) * | 1986-07-29 | 1989-07-04 | Toko, Inc. | Inductance element with core of magnetic thin films |
JPH02101718A (en) * | 1988-10-08 | 1990-04-13 | Mitsubishi Rayon Co Ltd | Magnetic core and manufacture thereof |
US5443664A (en) * | 1988-11-16 | 1995-08-22 | Hitachi Metals, Ltd. | Surge current-suppressing circuit and magnetic device therein |
JPH0787133B2 (en) * | 1989-02-02 | 1995-09-20 | 日立金属株式会社 | Wound magnetic core made of Fe-based microcrystalline soft magnetic alloy and method for manufacturing the same |
DE4117878C2 (en) * | 1990-05-31 | 1996-09-26 | Toshiba Kawasaki Kk | Planar magnetic element |
KR970000872B1 (en) * | 1990-09-28 | 1997-01-20 | 가부시키가이샤 도시바 | Magnetic core |
US5242760A (en) * | 1990-10-09 | 1993-09-07 | Mitsui Petrochemical Industries Ltd. | Magnetic ribbon and magnetic core |
JP2812569B2 (en) * | 1991-03-18 | 1998-10-22 | アルプス電気株式会社 | Low frequency transformer |
JP3291099B2 (en) * | 1993-03-05 | 2002-06-10 | アルプス電気株式会社 | Soft magnetic alloy and planar magnetic element |
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US6749695B2 (en) * | 2002-02-08 | 2004-06-15 | Ronald J. Martis | Fe-based amorphous metal alloy having a linear BH loop |
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-
2003
- 2003-01-30 US US10/354,791 patent/US7056595B2/en not_active Expired - Lifetime
- 2003-12-10 KR KR1020057014006A patent/KR101143014B1/en not_active IP Right Cessation
- 2003-12-10 CN CNB2003801102233A patent/CN100537218C/en not_active Expired - Fee Related
- 2003-12-10 AU AU2003300955A patent/AU2003300955A1/en not_active Abandoned
- 2003-12-10 WO PCT/US2003/039980 patent/WO2004069536A1/en active Application Filing
- 2003-12-10 JP JP2004568029A patent/JP5372312B2/en not_active Expired - Fee Related
- 2003-12-10 EP EP03815776A patent/EP1594688A4/en not_active Withdrawn
-
2004
- 2004-01-30 TW TW93102198A patent/TWI328511B/en not_active IP Right Cessation
-
2005
- 2005-06-02 US US11/142,464 patent/US7138188B2/en not_active Expired - Lifetime
-
2006
- 2006-08-02 HK HK06108596A patent/HK1088281A1/en not_active IP Right Cessation
-
2011
- 2011-03-09 JP JP2011051020A patent/JP5702632B2/en not_active Expired - Fee Related
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US4808464A (en) * | 1987-07-23 | 1989-02-28 | Westinghouse Electric Corp. | Insulating ferromagnetic amorphous metal strips |
JPH01289228A (en) * | 1988-05-17 | 1989-11-21 | Matsushita Electric Ind Co Ltd | Noise filter |
US4983859A (en) * | 1988-08-25 | 1991-01-08 | Hitachi Metals, Ltd. | Magnetic device for high-voltage pulse generating apparatuses |
JPH03208406A (en) * | 1990-01-10 | 1991-09-11 | Toshiba Corp | Noise filter element |
US5639566A (en) * | 1990-09-28 | 1997-06-17 | Kabushiki Kaisha Toshiba | Magnetic core |
US5470646A (en) * | 1992-06-11 | 1995-11-28 | Kabushiki Kaisha Toshiba | Magnetic core and method of manufacturing core |
Non-Patent Citations (1)
Title |
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See also references of EP1594688A4 * |
Also Published As
Publication number | Publication date |
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JP2006514433A (en) | 2006-04-27 |
JP5702632B2 (en) | 2015-04-15 |
EP1594688A4 (en) | 2009-05-27 |
KR20050097961A (en) | 2005-10-10 |
KR101143014B1 (en) | 2012-05-22 |
CN1759007A (en) | 2006-04-12 |
US7138188B2 (en) | 2006-11-21 |
JP5372312B2 (en) | 2013-12-18 |
TW200502088A (en) | 2005-01-16 |
US20050221126A1 (en) | 2005-10-06 |
US20040151920A1 (en) | 2004-08-05 |
JP2011155278A (en) | 2011-08-11 |
US7056595B2 (en) | 2006-06-06 |
CN100537218C (en) | 2009-09-09 |
AU2003300955A1 (en) | 2004-08-30 |
HK1088281A1 (en) | 2006-11-03 |
EP1594688A1 (en) | 2005-11-16 |
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