[go: up one dir, main page]

EP0145245A2 - Noyeau d'un filtre de bruit comportant un alliage amorphe - Google Patents

Noyeau d'un filtre de bruit comportant un alliage amorphe Download PDF

Info

Publication number
EP0145245A2
EP0145245A2 EP84307588A EP84307588A EP0145245A2 EP 0145245 A2 EP0145245 A2 EP 0145245A2 EP 84307588 A EP84307588 A EP 84307588A EP 84307588 A EP84307588 A EP 84307588A EP 0145245 A2 EP0145245 A2 EP 0145245A2
Authority
EP
European Patent Office
Prior art keywords
core
permeability
pulse
flux density
curve
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.)
Granted
Application number
EP84307588A
Other languages
German (de)
English (en)
Other versions
EP0145245A3 (en
EP0145245B1 (fr
Inventor
Suguru Takayama
Masao Shigeta
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.)
TDK Corp
Original Assignee
TDK Corp
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
Priority claimed from JP58206898A external-priority patent/JPS60100650A/ja
Priority claimed from JP59204141A external-priority patent/JPS6184357A/ja
Application filed by TDK Corp filed Critical TDK Corp
Priority to EP90105789A priority Critical patent/EP0384491B1/fr
Publication of EP0145245A2 publication Critical patent/EP0145245A2/fr
Publication of EP0145245A3 publication Critical patent/EP0145245A3/en
Application granted granted Critical
Publication of EP0145245B1 publication Critical patent/EP0145245B1/fr
Expired legal-status Critical Current

Links

Images

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
    • H01F1/147—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
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/04—Cores, Yokes, or armatures made from strips or ribbons

Definitions

  • the present invention relates to the core of a noise filter comprised of amorphous alloy. More particularly, it relates to the core of a noise filter for eliminating pulse noise, the noise filter comprising a core and a pair of windings for generating magnetic fluxes which offset each other.
  • ferrite is used as the core of a noise filter. Ferrite has an excellent permeability characteristic but its saturation flux density is low. Silicon steels are also conventionally used as the core of a noise filter. Silicon steels have a high permeability at a low frequency and a high magnetic flux density. However, the frequency characteristic of the permeability is not excellent.
  • compacted iron powder is conventionally used as the core of a noise filter. Compacted iron powder has a high saturation density but its permeability is low.
  • Amorphous alloys can be excellent magnetic materials because of their disordered structure and a watt loss as low as one third that of conventional crystalline alloys. Therefore, as is well known, enormous efforts have been made to investigate the thermally stable soft magnetic properties, such as a high residual flux density, a high saturation flux density, and a low watt loss of amorphous alloy compositions. Such soft magnetic properties can usually be attained when the BH curve has a rectangular shape and is longitudinally elongated, i.e., when the coercive force is low the magnetization at a predetermined magnetic field is high.
  • Japanese Unexamined Patent Publication No. 54-148122 discloses an amorphous alloy which contains from 80 to 84 atomic % of iron, from 12 to 15 atomic % of boron, and from 1 to 8 atomic % of silicon and which exhibits a high saturation flux density, a high ductility, and a high-temperature stability.
  • United States Patent No. 4,217,315 illustrates the composition of an Fe-B-Si-based amorphous alloy by a curved area and describes an Fe 81 B 13.3 - 15.7 Si 3-5 composition as a typical one which has a high saturation magnetization, a high cyrstallization temperature, and a low coercive force and is thus excellent for use as a motor and a transformer.
  • the magnetic properties are improved by carrying out a heat treatment under a magnetic field.
  • Japanese Unexamined Patent Publication No. 57-137451 discloses that an amorphous alloy which consists of from 77 to 80 atomic % of iron, from 12 to 16 atomic % of boron, and from 5 to 10 atomic % of silicon exhibits the following properties: 15 kG or more of a saturation magnetization, approximately 0.04 Oe or less of a coercive force, and O.lW/pound of watt loss (12.6 kG, 60 Hz).
  • Japanese Unexamined Patent Publication No. 58-34162 discloses that an amorphous alloy which consists of from 78 to 82 atomic % of iron, from 8 to 14 atomic % of boron, from 5 to 15 atomic % of silicon, and up to 1.5 atomic % of carbon has an anti-magnetic aging property and good watt loss and magnetic flux density.
  • Japanese Unexamined Patent Publication No. 58-42751 discloses that in an amorphous alloy which consists of from 77 to 79 atomic % of iron, from 8 to 12 atomic % of silicon, from 9 to 11 atomic % of boron, and from 1 to 3 atomic % of carbon, the secular change of magnetic properties is very small.
  • Japanese Unexamined Patent Publication No. 56-127749 discloses that when x is from 4 to 9.5 atomic % and a is from 82 to 86 atomic % in an Fe a-x B 100-a-x Si2 x composition, the amorphous alloy has thermally stable soft magnetic properties.
  • Japanese Unexamined Patent Publication No. 57-190304 discloses that in the Fe 100-a-b-c Mo a X b Y c composition (X is Ni, Co or the like, Y is Si, Al, B, C or the like, a is from 0.1 to 6 atomic %, b is from 0 to 30 atomic %, and c is from 15 to 30 atomic %). Mo is effective for enhancing the squareness ratio, i.e., providing the amorphous alloy with a squareness ratio of 60% or more under a direct current magnetization.
  • Disclosed in this study is an abnormal phenomenon in which the permeability drastically decreases at a certain frequency, e.g., in the vicinity of 50 kHz, by approximately 20 percent.
  • the report also discloses that this abnormal decrease in the permeability is attributable to a magnetomechanical resonance, and is mainly influenced by the magnetostriction; that is, the abnormal decrease in the permeability is most remarkable in amorphous alloys having a large magnetostriction.
  • the noise filter may be referred to as a two-line power filter for digital equipment, such as in USP No. 3,996,537, or a power supply filter for noise suppression, such as in USP No. 3,683,271.
  • the noise filter 1 comprises the core lA and a pair of windings 2A and 2B.
  • the alternating current indicated by AC 100 V is applied to the noise filter and generates magnetic fluxes when it is conducted through the windings 2A and 2B.
  • the sum of the magnetic fluxes produced by the windings 2A and 2B is zero.
  • a capacitor 3 and capacitors 4A and 4B are connected between the windings 2A and 2B.
  • the capacitors 4A and 4B are connected to each other and are grounded at the connecting point thereof.
  • the relationship between the noise input voltage and the noise output voltage is shown in Fig. 2.
  • the noise output voltage abruptly increases when the noise input voltage exceeds a critical value. The reason for this is because the core 1A (Fig. 1) of the noise filter is magnetically saturated, and when such an abrupt increase in the noise output voltage occurs, the noise filter does not function.
  • the curve shown in Fig. 2 has in the low-noise output range an inclination which is determined by the inductance of the noise filter 1 (Fig. 1), i.e., the permeability of the core lA.
  • the inclination is lessened in accordance with an increase in permeability.
  • the noise input voltage at which the curve shown in Fig. 2 abruptly increases, is determined by the saturation flux density of the core lA. Therefore, the core of a noise filter must have a high permeability and a high saturation flux density. In addition, when a noise filter is used for filtering noise of a high frequency voltage, the frequency characteristic of the permeability must be excellent.
  • Japanese Unexamined Patent Publication No. 56-45516 discloses a core of a noise filter which consists of an essentially completely amorphous alloy. This core is remarkably improved over the conventional ones, especially when it is used for filtering a high noise voltage. However, it is insufficient for suppressing a high-voltage noise pulse of 1,000 V or more generated for 1 psec or more. Such a noise pulse is frequently superimposed on the current of a power line or power circuit.
  • Japanese Unexamined Patent Publication No. 57-24519 discloses a core of a noise filter which consists of a magnetic amorphous alloy which partially contains precipitated crystals.
  • the core was invented by the present inventors, who discovered that when precipitated cyrstals are present in an amorphous alloy the core can effectively suppress a high-voltage noise pulse.
  • Japanese Unexamined Patent Publication No. 57-24158 specifies the BH curve of an amorphous alloy for use as a noise filter. More in detail, as is noted hereinabove with refernce to Figs. 1 and 2, a high inductance for a high permeability of the core of a noise filter usually results in a decrease in the noise output voltage. However, in the case of a square and longitudinally long BH curve which is obtained by increasing the permeability, a high-voltage noise pulse cannot be eliminated.
  • the BH curve is specified to have a slanted shape in terms of 2,000 G ⁇ B 2 ⁇ 0.7 Bs(G), wherein B 2 is the magnetic flux density at a magnetization of 2 Oe and 50 kHz and Bs is the saturation flux density.
  • B 2 is the magnetic flux density at a magnetization of 2 Oe and 50 kHz
  • Bs is the saturation flux density.
  • Fe76Co4B18.9Si2.1 , Fe 78.4 Ni 1.6 B 12 Si 8 , Fe 62.4 Ni 16 Mo 1.6 B 16 Si 4 , and the like are mentioned as amorphous alloys.
  • the BH curve should be slanted, i.e., a constant permeability characteristic or an unchanged permeability ⁇ , depending upon the magnetic field, and a not very high residual flux density Br. Such BH curve is undesirable for the core of a transformer, an electric motor, or the like.
  • the properties required for the noise filter can be obtained by adjusting the composition of the amorhous alloy to have zero magnetostriction, since the above described abnormal decrease in the permeability, which is undesirable for the core of a noise filter, can be avoided by the zero-magnetostrictive composition, according to the report Proc.... Rapid Quench Metal.
  • the properties other than the magnetostriction especially the magnetic flux density are poor, and further, the magnetic properties exhibit a great secular change. This makes the zero-magnetostrictive alloy inappropriate for the core of a noise filter.
  • Pulse-resistance deterioration is a phenomenon in which a high-voltage noise pulse can be eliminated as desired the first time a noise filter is used but cannot be eliminated at subsequent times the noise filter is used.
  • the core of a noise filter according to the present invention comprises a coiled thin strip of an amorphous magnetic alloy which essentially consists of an A component which is Fe or Fe together with at least one transition metal element, a B component which is at least one selected from the group consisting of Si and Al, and a C component which is at least one selected from the group consisting of B, C, and P, contains the A, B, and C elements in an amount falling on or within curve X shown in Fig.
  • the composition of this amorphous magnetic alloy is hereinafter referred to as the first composition.
  • An amorphous magnetic alloy having the first composition has a low pulse-resistance deterioration.
  • the core of a noise filter according to the present invention comprises a coiled thin strip of an amorphous magnetic alloy which essentially consists of an A component which is Fe or Fe together with at least one transition metal element, a B component which is at least one selected from the group consisting of Si and Al, and a C component which is at least one selected from the group consisting of B, C, and P, contains the A, B, and C elements is an amount falling on or within curve Y and falling outside the curve X shown in Fig.
  • the composition of this amorphous magnetic alloy is hereinafter referred to as the second composition.
  • An amorphous magnetic alloy having the second composition has a low pulse-resistance deterioration and a high permeability.
  • Pulse-resistance deterioration is not quantitatively determined in the industrial standards of inductors or the like.
  • the VDE 0565 Mol 3.3.6 inductance 3.6.2 of West Germany is an industrial standard which specifies general inductors, and in this standard it is mentioned that when current is supplied to a rod core or a choke coil made of a dust core, the variation in inductance from the nominal value must be +20% or less. This variation can undoubtedly be satisfied according to the first and second compositions.
  • the pulse-resistance deterioration percentage is defined herein by the euation: wherein ⁇ e is the permeability at 100 kHz and 2 mOe (0.002 Oe) and the demagnetization is a demagnetized state of zero magnetic flux density.
  • the present inventors Prior to defining the pulse-resistance deterioration percentage, the present inventors manufactured amorphous alloy cores in a toroidal form 31 mm in outer diameter, 19 mm in inner diamter, and 8 mm in height, applied a magnetic field of 20 Oe or less to them, demagnetized them, and measured the following permeability changes:
  • the present inventors obtained the results shown in Fig. 4.
  • the reduction in permeability (pe) is the greatest at 4 Oe of the applied magnetic field. That is, when a mangetic field of 4 Oe is applied to the amorphous alloy cores, the permeability (pe) is reduced by approximately 30% compared with the permeability (pe) before application of the magnetic field, i.e., the permeability (pe) which an amorphous alloy primarily exhibits.
  • a high-voltage noise pulse which can ordinarily be primarily eliminated, may not be able to be eliminated since the ability to eliminate noise decreases by approximately 30% when an extraneous noise which generates a magnetic field of 4 Oe is applied to a core.
  • the pulse-resistance deterioration percentage is determined as above. By controlling the pulse-resistance deterioration percentage, it is possible to control the most serious pulse-resistance deterioration which can possibly occur in cores. When the pulse-resistance deterioration percentage is appropriately controlled, pulse-resistance deterioration which may occur at a magnetic field higher than 4 Oe can be controlled.
  • the permeability ( P2 ) represents the noise-pulse suppression characteristics of a core to which a magnetic field higher than 2 mOe is applied due to a noise-pulse voltage.
  • the permeability is one of the important factors.
  • the permeability of amorphous alloys is structure-sensitive, accurate measurement thereof is not always easy.
  • the permeability was measured as accurately as possible using a 4274 tester of HP Corporation.
  • measurement of the permeability can involve a 5% error at the maximum.
  • the amorphous magnetic alloy according to the present invention is essentially amorphous. It may, however, optionally contain precipitated fine crystals in a minor amount. Precipitated fine crystals in the amorphous magentic alloy cause almost no change of the saturation flux density (B ) but cause a reduction of the magnetic flux density.
  • the heat treatment for precipitating the fine crystals is carried out, if necessary, for providing the properties required for the noise filter. That is, if the essentially amorphous alloy cannot attain the above-described Br and B 2 , the heat treatment for precipitating the fine crystals is carried out. In this case, the above-described Br and B 2 can also be attained by a heat treatment which does not result in appreciable precipitation of fine crystals.
  • the second composition in which Fe of the first composition is partly replaced with Mo preferably in an amount of 3% or more, attains a pulse-resistance deterioration equivalent or superior to that of the first composition, where the contents of A, B, and C components are outside the curve X shown in Fig. 3.
  • Table 1 shows the properties of the amorphous alloy having an Fe 76-x Mo x Si 6 B 18 composition. As is apparent from Table 1, the pulse-resistance deterioration percentage is drastically decreased due to the addition of Mo.
  • the u 2 (after pulse deterioration) in Table 1 and in the descriptions herein below is the permeability which is measured, after application of a magnetic field pulse of 4 Oe, under the condition of 100 kHz and 2 mOe (0.002 Oe).
  • Mo is more effective for the properties of amorphous alloy for the noise filter, than are the other additives, such as Nb, Cr, and or the like, disclosed in the first composition, as is now described with reference to Table 2.
  • the upper, middle, and lower values of the replaced composition indicate ⁇ 2 (after demagnetization), ⁇ 2 (after the pulse deterioration), and the pulse-resistance deterioration percentage, respectively.
  • the Fe 76 Si 6 B 18 composition has the following properties:
  • the A component is Fe or Fe and at least one transition metal element.
  • the at least one transition metal element is selected from the 4s-transition elements (Sc - Zn), the 5s-transition elements (Y - Cd), the 6s-transition elements (La - Hg), and elements having atomic numbers equal to or greater than Ac and may be Co, Ni, Cr, Cu, Mo, Nb, Ti, W, V, Zr, Ta, Y or a rare earth element.
  • M is preferably Mn, Cr, Mo, Nb, Ni, or Co, more preferably Mn.
  • Ni, Co, and Fe are used as M, Ni and Co may be approximately 20% or less based on M.
  • the other elements are used as M, their amount is usually approximately 5 atomic % or less.
  • the B component is at least one element selected from the group consisting of Si and Al.
  • the content of Al is preferably 10 atomic % or less based on the total content of Si and Al.
  • the C component is at least one element selected from the group consisting of B, C, and P.
  • the content of C is preferably 20 atomic % or less based on the total of B, C, and P, and the content of P is preferably 5% or less based on the total of B, C, and P.
  • At least one element selected from the group consisting of Be, Ge, Sb, and In may be contained in the first composition since such element does not impede the effects of the present invention.
  • the soft magnetic properties are somewhat inferior to those outside the curve X but not only can a high-voltage noise pulse be effectively eliminated but also pulse-resistance deterioration is not appreciable.
  • the permeability (u 2 ) is less than approximately 2,000, the inductance of the core of a noise filter is low so that the noise output voltage is disadvantageously high.
  • the permeability (u 2 ) is more than approximately 5,000, the BH curve markedly tends to saturate at low pulse voltage, with the result that a high-voltage noise pulse cannot be eliminated.
  • the residual flux density (Br) should be as low as possible. If the residual flux density (Br) is more than 3 kG, the constant permeability characteristic is lost and the compositional range of the amorphous alloy, in which the eliminating ratio of pulse voltage is high, tends to be disadvantageously narrowed.
  • the pulse-resistance deterioration percentage is 10% or less.
  • the pulse resistance deterioration percentage is 5% or less.
  • Curves Y and Z indicate compositions having a pulse-resistance deterioration percentage of -20% and -30%, respectively.
  • Curves U, V, and W indicate compositions having, after demagnetization, a permeability of 10,000, 7,500, and 5,000, respectively, measured at 100 kHz.
  • the permeability measured at 25 kHz is the highest within the curve U.
  • the compositional range within the curve U is almost coincident with that where the permeability (P 2 ) is the highest.
  • the content range of the A, B, and C components where the pulse-resistance deterioration percentage is low is not coincident with that where the permeabilities are the highest.
  • Curve S in Fig. 5 indicates the amounts of the A, B, and C components, at which amounts the saturation flux density measured at 2 kHz of alternating current and 10 Oe of magnetization force becomes approximately 15 kG.
  • the amounts of the A, B, and C components are on the right-hand side of the curve S (on the iron-rich side), the above-mentioned saturation flux density becomes high. Therefore, the amounts of the A, B, and C components indicated by the curve X according to the present invention are such that the above-mentioned saturation flux density (B ) is low.
  • a preferable ratio of crystals to glass is usually 50% or less regarding the first composition.
  • the A component is Fe and Mo or Fe plus Mo and at least one transition metal element selected from the 4s-transition elements (Sc - Zn), the 5s-transition elements (Y - Cd), the 6s-transition elements (La - Hg).
  • the Mo and the at least one transition element are hereinafter referred to as the M.
  • the M other than Mo is preferably Co, Ni, Cr, Cu, Nb, Ti, W, V, Zr, Ta, Y or a rare earth element.
  • Ni and Co of the M components can be contained in the second composition in an amount up to approximately 20 atomic % based on Fe.
  • the other M components (except for Mo) can be contained in the second composition in an amount up to approximately 5% based on Fe.
  • M is preferably V, Mn, Cr, Nb, Ni, or Co, more preferably Mn, V, or Nb.
  • the B component is at least one element selected from the group consisting of Si and Al.
  • the content of Al is preferably 10 atomic % or less based on the total content of Si and Al.
  • the C component is at least one element selected from the group consisting of B, C, and P.
  • the content of C is preferably 20 atomic % or less based on the total of B, C, and P, and the content of P is preferably 5% or less based on the total of B, C, and P.
  • the P2 (after demagnetization) of 5000 or more ( ⁇ 2 ⁇ 5000) is obtained.
  • the A component is 80% or more, the crystallization temperature becomes low, and the secular change of permeability is seriously increased.
  • a preferred content of the A component is less than 80%.
  • the ⁇ 2 (after demagnetization) of 6000 or more ( ⁇ 2 ⁇ 6000) can be obtained.
  • the permeability ( ⁇ 2 ), the residual flux density (Br), and the magnetic flux density (B 2 ) are determined in the second composition so as to provide the core of a noise filter which can effectively eliminate a high-voltage pulse, as specifically described hereinafter.
  • the inductance of the core of a noise filter becomes too low to attain a high attenuation of noise or a low noise output voltage.
  • the magnetic properties such as a high magnetic flux density and low core loss required for the soft magnetic material, can be attained, since the conventional amorphous soft magnetic material having the Fe amount of around 80% do have such properties, but the pulse-resistance is seriously impaired.
  • the amount of A, B, and C components, which is indicated by the overlapping curves X and Y, is not included in the fourth composition, since the permeability ( P2 ) is generally low, e.g., approximately 3000.
  • the permissible input voltage of noise disadvantageously becomes low.
  • the magnetic flux density (B 2 ) is more than 11 kG, the BH curve tends to have a non-linear portion, i.e., the permeability tends to become inconstant, and the permissible input voltage of noise becomes low. This means that steep increase of the curve shown in Fig. 2 occurs at a low input voltage.
  • the magnetostriction amount was not essentially changed by the addition of Mo.
  • the squareness ratio of the alloys according to the present invention was measured. This was less than 50%, and usually 20% or less.
  • a small amount of the fine crystals may be precipitated depending upon the temperature and time of the heat treatment.
  • the fine crystals precipitated in the amorphous alloy at a minor amount are detected by the following procedure.
  • a thin strip of the amorphous alloy is subjected to ion-etching or electrolytic polishing to reduce its thickness to 50 nm or less.
  • the thin strip is then observed by a transmission type electron microscope under the conditions of an accelerated voltage of 100 - 200 kV and magnification of 10,000 to 100,000.
  • the presence and quantity of precipitated fine crystals can be determined by contrast.
  • fine crystals are precipitated in the amorphous alloy of the second composition, they are 3% by area or less, usually 0.5% by area or less.
  • the amorphous alloy subjected to the heat treatment is F e 75 M o 5 si 12 B 8 ' and under the conditions Nos. 3 through 7, the properties according to the present invention are attained.
  • the precipitation of fine crystals causes virtually no change in the saturation flux density (B ) (not shown in Table 4) and causes the reduction in the residual flux density (Br). No matter if the fine crystals are not precipitated, during the heat treatment at a temperature below the crystallization temperature, the residual flux density (Br) is reduced without virtually causing the change in the saturation flux density (Bs).
  • the Fe 73 Mo 5 Si 9 B 13 amorphous alloy (the second composition) was subjected to various heat treatments to change the P2 (after demagnetization).
  • the influence of the ⁇ 2 (after demagnetization) upon the ⁇ 2 (after pulse deterioration) and the pulse-resistance deterioration percentage was investigated. The results are shown in Fig. 6.
  • the ⁇ 2 (after pulse deterioration) lies far below this line, and the pulse-deterioration percentage is drastically decreased, when the P2 (after demagnetization) is more than approximately 5500.
  • Such a tendency as shown in Fig. 6 is present in the amorphous alloy having the second composition but is mitigated due to Mo as compared with the amorphous alloy which is free of Mo.
  • the core may be disposed in a nonmagnetic resin case, a nonmagnetic or magnetic metal case or a ceramic case.
  • the thin strip of an amorphous alloy can have a thickness of from approximately 10 ⁇ m to 100 ⁇ m, preferably from 10 ⁇ m to 50 ⁇ m, and a width of from 0.1 cm to 50 cm.
  • One end of the coiled thin strip may be fixed to another part of the strip by any appropriate means, such as bonding, welding, taping, or caulking, and insulating material may be sandwiched between the opposed surface parts of the coiled thin strip.
  • a heat treatment for precipitating fine crystals may be carried out in the ambient air, an inert gas, or a non-oxidizing atmosphere.
  • This heat treatment has also a purpose of stress relief-annealing of the coiled thin strip of an amorphous magnetic alloy.
  • Amorphous magnetic alloy thin strips 18 ⁇ m thick and 8 mm wide were produced by a known single-roll method, were wound as cores, and were heat-treated. The properties of the heat-treated cores were measured. These properties and the compositions of the amorphous magnetic alloy thin strips are shown in Table 5.
  • compositions indicated by * are those of the present invention, and the compositions not indicated by * are comparative examples.
  • the amounts of the A component (Fe alone or a combination of Fe and M), the B component (Si alone or a combination of Si and Al), and the C component (B alone or a combination of B, C, and P) are critical for obtaining improved resistance to pulse.
  • Amorphous alloy thin strips 18 ⁇ m in thickness and 8 mm in width were produced by a known single roll method, wound in the form of a wound core, and heat treated.
  • the properties of the cores and the composition of the amorphous alloy are shown in Table 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Coils Or Transformers For Communication (AREA)
EP19840307588 1983-11-05 1984-11-02 Noyeau d'un filtre de bruit comportant un alliage amorphe Expired EP0145245B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP90105789A EP0384491B1 (fr) 1983-11-05 1984-11-02 Noyeau d'un filtre de bruit comportant un alliage amorphe

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP58206898A JPS60100650A (ja) 1983-11-05 1983-11-05 耐パルス特性劣化が少ない非晶質合金
JP206898/83 1983-11-05
JP204141/84 1984-10-01
JP59204141A JPS6184357A (ja) 1984-10-01 1984-10-01 耐パルス特性劣化が少ない非晶質合金

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP90105789.3 Division-Into 1984-11-02
EP90105789A Division EP0384491B1 (fr) 1983-11-05 1984-11-02 Noyeau d'un filtre de bruit comportant un alliage amorphe

Publications (3)

Publication Number Publication Date
EP0145245A2 true EP0145245A2 (fr) 1985-06-19
EP0145245A3 EP0145245A3 (en) 1987-01-28
EP0145245B1 EP0145245B1 (fr) 1991-03-06

Family

ID=26514300

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19840307588 Expired EP0145245B1 (fr) 1983-11-05 1984-11-02 Noyeau d'un filtre de bruit comportant un alliage amorphe
EP90105789A Expired - Lifetime EP0384491B1 (fr) 1983-11-05 1984-11-02 Noyeau d'un filtre de bruit comportant un alliage amorphe

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP90105789A Expired - Lifetime EP0384491B1 (fr) 1983-11-05 1984-11-02 Noyeau d'un filtre de bruit comportant un alliage amorphe

Country Status (2)

Country Link
EP (2) EP0145245B1 (fr)
DE (2) DE3486331T2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3705893A1 (de) * 1986-02-24 1987-08-27 Toshiba Kawasaki Kk Verfahren zur herstellung von magnetkernen mit hoher permeabilitaet
EP0209742B1 (fr) * 1985-07-20 1989-10-18 Vacuumschmelze GmbH Bobine de choc d'antiparasitage à compensation en courant

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2780853B1 (fr) 1998-07-10 2000-09-22 Lucas Sa G Machine distributrice de produit du genre fourrage et autres pour l'alimentation du betail
ES2185297T3 (es) 1998-07-10 2003-04-16 Lucas Sa G Maquina distribuidora de productos del tipo forraje y otros para la alimentacion del ganado.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57190304A (en) * 1981-05-19 1982-11-22 Hitachi Metals Ltd Magnetic material
EP0055327B1 (fr) * 1980-12-29 1984-08-08 Allied Corporation Alliage métallique amorphe présentant de meilleures propriétés magnétiques en alternatif
EP0119432A2 (fr) * 1983-03-16 1984-09-26 Allied Corporation Alliages amorphes pour dispositif électromagnétique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0055327B1 (fr) * 1980-12-29 1984-08-08 Allied Corporation Alliage métallique amorphe présentant de meilleures propriétés magnétiques en alternatif
JPS57190304A (en) * 1981-05-19 1982-11-22 Hitachi Metals Ltd Magnetic material
EP0119432A2 (fr) * 1983-03-16 1984-09-26 Allied Corporation Alliages amorphes pour dispositif électromagnétique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 7, no. 36 (E-158)[1181], 15th February 1983; & JP-A-57 190 304 (HITACHI KINZOKU K.K.) 22-11-1982 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0209742B1 (fr) * 1985-07-20 1989-10-18 Vacuumschmelze GmbH Bobine de choc d'antiparasitage à compensation en courant
DE3705893A1 (de) * 1986-02-24 1987-08-27 Toshiba Kawasaki Kk Verfahren zur herstellung von magnetkernen mit hoher permeabilitaet
US4859256A (en) * 1986-02-24 1989-08-22 Kabushiki Kaisha Toshiba High permeability amorphous magnetic material
DE3705893C3 (de) * 1986-02-24 1998-10-22 Toshiba Kawasaki Kk Verfahren zur Herstellung eines Magnetkerns mit hoher Permeabilität und Verwendung eines danach hergestellten Magnetkerns

Also Published As

Publication number Publication date
DE3484231D1 (de) 1991-04-11
DE3486331T2 (de) 1995-04-06
EP0145245A3 (en) 1987-01-28
EP0384491B1 (fr) 1994-08-10
EP0384491A3 (fr) 1991-01-09
EP0384491A2 (fr) 1990-08-29
DE3486331D1 (de) 1994-09-15
EP0145245B1 (fr) 1991-03-06

Similar Documents

Publication Publication Date Title
US4038073A (en) Near-zero magnetostrictive glassy metal alloys with high saturation induction
US4637843A (en) Core of a noise filter comprised of an amorphous alloy
EP0042525B1 (fr) Alliage magnétique amorphe
US5211767A (en) Soft magnetic alloy, method for making, and magnetic core
JP2011102438A (ja) 直線的なｂｈループを有する鉄系アモルファス合金
EP0240600B1 (fr) Alliages métalliques vitreux à caractéristiques perminvar
US6992555B2 (en) Gapped amorphous metal-based magnetic core
US5192375A (en) Fe-based soft magnetic alloy
EP0384491B1 (fr) Noyeau d'un filtre de bruit comportant un alliage amorphe
JP2000277357A (ja) 可飽和磁心ならびにそれを用いた電源装置
JPS6332244B2 (fr)
EP0084138A2 (fr) Alliages métalliques ayant une structure de verre, une magnétostriction de presque zéro et une grande stabilité magnétique et thermique
EP0351051B1 (fr) Alliage magnétique doux à base de fer
JP2698769B2 (ja) 高透磁率磁心の製造方法
EP0329704B1 (fr) Alliages metalliques vitreux magnetostrictifs proches de zero pour applications haute frequence
JPH0351081B2 (fr)
JP3322407B2 (ja) Ｆｅ基軟磁性合金
JPS61261451A (ja) 磁性材料とその製造方法
JPS62167840A (ja) 磁性材料とその製造方法
JPH0533302B2 (fr)
JP3228427B2 (ja) 超微結晶軟磁性合金
JPS6184357A (ja) 耐パルス特性劣化が少ない非晶質合金
JP2698577B2 (ja) 高透磁率磁心の製造方法
JPH0727812B2 (ja) コモンモードチョーク用アモルファス磁心
JPH038303A (ja) 低周波用磁心

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19870718

17Q First examination report despatched

Effective date: 19890322

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

XX Miscellaneous (additional remarks)

Free format text: TEILANMELDUNG 90105789.3 EINGEREICHT AM 02/11/84.

REF Corresponds to:

Ref document number: 3484231

Country of ref document: DE

Date of ref document: 19910411

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20021030

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20021107

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20021108

Year of fee payment: 19

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031102

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040602

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20031102

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040730

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST