EP0873567B1 - Distributed gap electrical choke - Google Patents

Distributed gap electrical choke Download PDF

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Publication number
EP0873567B1
EP0873567B1 EP97901927A EP97901927A EP0873567B1 EP 0873567 B1 EP0873567 B1 EP 0873567B1 EP 97901927 A EP97901927 A EP 97901927A EP 97901927 A EP97901927 A EP 97901927A EP 0873567 B1 EP0873567 B1 EP 0873567B1
Authority
EP
European Patent Office
Prior art keywords
core
annealing
temperature
permeability
metal alloy
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP97901927A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0873567A1 (en
Inventor
Aliki Collins
John Silgailis
Joseph Abou-Elias
Ronald J. Martis
Ryusuke Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metglas Inc
Original Assignee
Honeywell International 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 Honeywell International Inc filed Critical Honeywell International Inc
Publication of EP0873567A1 publication Critical patent/EP0873567A1/en
Application granted granted Critical
Publication of EP0873567B1 publication Critical patent/EP0873567B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15308—Amorphous metallic alloys, e.g. glassy metals based on Fe/Ni
    • 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
    • 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

Definitions

  • This invention relates to an amorphous metal magnetic core with a distributed gap for electrical choke applications; and more particularly to a method for annealing the amorphous core to create the distributed gap therein.
  • An electrical choke is an energy storage inductor.
  • the magnetic flux in the air gap remains the same as in the ferromagnetic core material.
  • the gap can be discrete or distributed.
  • a distributed gap can be introduced by using ferromagnetic powder held together with nonmagnetic binder or by partially crystallizing an amorphous alloy. In the second case, ferromagnetic crystalline phases separate and are surrounded by nonmagnetic matrix. This partial crystallization mechanism is utilized in connection with the choke of the present invention.
  • US-A-4,812,181 there is disclosed a method for achieving flat magnetization loop by subjecting Fe base amorphous cores to a long term (more than 10 hrs) anneal at temperatures higher than 410 °C.
  • the method disclosed therein includes the step of crystallizing the surface of the amorphous ribbon, thereby applying stress on the amorphous bulk of the ribbon.
  • an electrical choke is made based on heat treating Fe-base amorphous cores.
  • the maximum permeability is reduced to between 1/50 and 1/30 of the original value, (for maximum permeability of 40,000 this treatment results in values ranging from about 800 and 1300) and the amorphous cores exhibit a degree of crystallization, which does not exceed 10% of the volume.
  • EP-A-513-385 discloses iron-base soft magnetic alloys which require Aluminum to inhibit Fe-B crystal formation.
  • the invention provides a method for producing an electrical chake as disclosed in claim 1.
  • the present invention provides electrical chokes having sizes ranging from about 8 mm to 45 mm OD with permeabilities in the range of 100 to 400 and low core losses (less than 70 W/kg at 100 kHz and 0.1T).
  • the magnetic properties are maintained under DC bias (at least 40% of the initial permeability is maintained at a DC bias field of 3980 A/m or 50 Oe).
  • the present invention requires certain annealing temperature and time parameters and degree of control of these parameters in order to achieve the desired choke properties.
  • Fig. 1 depicts the permeability of the annealed Fe-base magnetic core as a function of the annealing temperature.
  • the permeability was measured with an induction bridge at 10 kHz frequency , 8-turn jig and 100 mV ac excitation.
  • the annealing time was kept constant at 6 hrs. All the cores were annealed in an inert gas atmosphere.
  • the different curves represent Fe-base alloys with small variations in the chemical composition and consequently small changes in their crystallization temperature.
  • the crystallization temperatures were measured by Differential Scanning Calorimetry (DSC). A reduction in the permeability is observed with increasing annealing temperature for a constant annealing time. For a given annealing temperature the permeabilities scale according to the crystallization temperature, i.e. the permeability is highest for the alloy with the highest crystallization temperature.
  • Fig. 2 depicts the permeability of the annealed Fe-base cores with the same chemical composition as a function of the annealing temperature.
  • the different curves represent different annealing times. The plot indicates that for temperatures higher than 450 °C the effect of the annealing temperature dominates the effect of the annealing time.
  • Typical magnetic characterization data for the chokes such as core loss and DC bias are shown in Figs. 4 and 5.
  • the core loss data are plotted as a function of the DC bias field and the different curves represent different measuring frequencies.
  • the data shown are for cores with 25 mm OD.
  • An important parameter for the choke performance is the percent of the initial permeability that remains when the core is driven by a DC bias field.
  • Fig. 5 depicts a typical DC bias curve for a core having 35mm OD.
  • FIG. 6 depicts a typical cross-sectional SEM indicating that both the bulk of the alloy and the surface are crystallized. This is readily distinguished from the method described in US patent 4,812,181, in which only the surface is crystallized.
  • the volume percent of the crystallization was determined from both the SEM and XRD data and is plotted in Fig. 7 as a function of permeability. For permeabilities in the range of 100 to 400 bulk crystallization in the range of 5 to 30% is required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Cable Accessories (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
EP97901927A 1996-01-11 1997-01-08 Distributed gap electrical choke Expired - Lifetime EP0873567B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US58478796A 1996-01-11 1996-01-11
US584787 1996-01-11
PCT/US1997/000178 WO1997025727A1 (en) 1996-01-11 1997-01-08 Distributed gap electrical choke

Publications (2)

Publication Number Publication Date
EP0873567A1 EP0873567A1 (en) 1998-10-28
EP0873567B1 true EP0873567B1 (en) 2002-04-03

Family

ID=24338791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97901927A Expired - Lifetime EP0873567B1 (en) 1996-01-11 1997-01-08 Distributed gap electrical choke

Country Status (9)

Country Link
EP (1) EP0873567B1 (zh)
JP (2) JP4629165B2 (zh)
KR (1) KR100452535B1 (zh)
CN (1) CN1114217C (zh)
AT (1) ATE215727T1 (zh)
DE (1) DE69711599T2 (zh)
DK (1) DK0873567T3 (zh)
TW (1) TW351816B (zh)
WO (1) WO1997025727A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6534261B1 (en) 1999-01-12 2003-03-18 Sangamo Biosciences, Inc. Regulation of endogenous gene expression in cells using zinc finger proteins

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6144279A (en) * 1997-03-18 2000-11-07 Alliedsignal Inc. Electrical choke for power factor correction
DE69942334D1 (de) 1998-03-02 2010-06-17 Massachusetts Inst Technology Poly-zinkfinger-proteine mit verbesserten linkern
CN1241215C (zh) * 1998-03-27 2006-02-08 梅特格拉斯公司 矩形的树脂封装的绕组和干式配电变压器
US6503717B2 (en) 1999-12-06 2003-01-07 Sangamo Biosciences, Inc. Methods of using randomized libraries of zinc finger proteins for the identification of gene function
AU2002243645A1 (en) 2001-01-22 2002-07-30 Sangamo Biosciences, Inc. Zinc finger proteins for dna binding and gene regulation in plants
US7262054B2 (en) 2002-01-22 2007-08-28 Sangamo Biosciences, Inc. Zinc finger proteins for DNA binding and gene regulation in plants
US7541909B2 (en) * 2002-02-08 2009-06-02 Metglas, Inc. Filter circuit having an Fe-based core
DE102004024337A1 (de) * 2004-05-17 2005-12-22 Vacuumschmelze Gmbh & Co. Kg Verfahren zur Herstellung nanokristalliner Stromwandlerkerne, nach diesem Verfahren hergestellte Magnetkerne sowie Stromwandler mit denselben
DE202017103569U1 (de) * 2017-06-14 2018-09-17 Sma Solar Technology Ag Spule und elektrisches oder elektronisches Gerät mit einer derartigen Spule

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300950A (en) * 1978-04-20 1981-11-17 General Electric Company Amorphous metal alloys and ribbons thereof
GB2117979B (en) * 1982-04-01 1985-06-26 Telcon Metals Ltd Electrical chokes
JPS62186506A (ja) * 1986-02-12 1987-08-14 Meidensha Electric Mfg Co Ltd アモルフアス鉄心の焼鈍方法
DE3611527A1 (de) * 1986-04-05 1987-10-08 Vacuumschmelze Gmbh Verfahren zur erzielung einer flachen magnetisierungsschleife in amorphen kernen durch eine waermebehandlung
JP2868121B2 (ja) * 1987-07-28 1999-03-10 日立金属株式会社 Ｆｅ基磁性合金磁心の製造方法
KR950014314B1 (ko) * 1990-11-30 1995-11-24 미쓰이세끼유 가가꾸고오교오 가부시끼가이샤 Fe기 연자성합성
JP3322407B2 (ja) * 1990-11-30 2002-09-09 三井化学株式会社 Ｆｅ基軟磁性合金
JPH04341544A (ja) * 1991-05-17 1992-11-27 Mitsui Petrochem Ind Ltd Ｆｅ基軟磁性合金
US5252144A (en) * 1991-11-04 1993-10-12 Allied Signal Inc. Heat treatment process and soft magnetic alloys produced thereby

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6534261B1 (en) 1999-01-12 2003-03-18 Sangamo Biosciences, Inc. Regulation of endogenous gene expression in cells using zinc finger proteins
US6824978B1 (en) 1999-01-12 2004-11-30 Sangamo Biosciences, Inc. Regulation of endogenous gene expression in cells using zinc finger proteins

Also Published As

Publication number Publication date
KR100452535B1 (ko) 2004-12-17
JP4990389B2 (ja) 2012-08-01
JP2011061210A (ja) 2011-03-24
ATE215727T1 (de) 2002-04-15
CN1114217C (zh) 2003-07-09
DK0873567T3 (da) 2002-07-01
CN1208497A (zh) 1999-02-17
WO1997025727A1 (en) 1997-07-17
DE69711599T2 (de) 2002-10-31
JP4629165B2 (ja) 2011-02-09
TW351816B (en) 1999-02-01
JP2000503169A (ja) 2000-03-14
EP0873567A1 (en) 1998-10-28
KR19990076747A (ko) 1999-10-15
DE69711599D1 (de) 2002-05-08

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