EP0384491B1 - Noyeau d'un filtre de bruit comportant un alliage amorphe - Google Patents

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

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EP0384491B1
EP0384491B1 EP90105789A EP90105789A EP0384491B1 EP 0384491 B1 EP0384491 B1 EP 0384491B1 EP 90105789 A EP90105789 A EP 90105789A EP 90105789 A EP90105789 A EP 90105789A EP 0384491 B1 EP0384491 B1 EP 0384491B1
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Prior art keywords
pulse
permeability
core
curve
noise filter
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EP0384491A2 (fr
EP0384491A3 (fr
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Suguru Takayama
Masao Shigeta
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TDK Corp
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TDK Corp
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Priority claimed from JP59204141A external-priority patent/JPS6184357A/ja
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    • 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 Fe81B 13.3 - 15.7 Si3 ⁇ 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 3.2 A/m (0.04 Oe) or less of a coercive force, and 0.22 W/kg (0.1W/pound) of watt loss (1.26 T (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 Si 2x 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 1A 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 1A.
  • 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 1A. 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. 56-46516 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 ⁇ sec 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. 57-24518 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 0.2 T ⁇ B2 ⁇ 0.7 Bs (T) (2,000 G ⁇ B2 ⁇ 0.7 Bs(G)), wherein B2 is the magnetic flux density at a magnetization of 160 A/m (2 Oe) and 50 kHz and Bs is the saturation flux density.
  • B2 is the magnetic flux density at a magnetization of 160 A/m (2 Oe) and 50 kHz
  • Bs is the saturation flux density.
  • Fe76Co4B 18.9 Si 2.1 , Fe 78.4 Ni 1.6 B12Si8 , Fe 62.4 Ni16Mo 1.6 B16Si4 , 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 filter 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 invention described and claimed in the parent application No. 84 307588.8 provides a core of a noise filter comprising a coiled thin strip of an amorphous magnetic alloy, characterised in that said alloy essentially consists of a first component (A) which is Fe or Fe together with at least one transition metal element, a second component (B) which is at least one selected from the group consisting of Si and Al, and a third component (C) which is at least one selected from the group consisting of B, C, and P, said first, second and third components being contained in an amount falling within an area defined by a curve X and on the line of said curve X shown in Fig.
  • said alloy exhibiting a permeability ( ⁇ 2) of from approximately 5,000 measured at 100 kHz and a magnetic field of 0.16 A/m (2 mOe), a residual flux density (Br) of 0.3 T (3 kG) or less determined in a BH curve measured at a frequency of 2 kHz and a maximum applied magnetic field of 160A/m (2 Oe), and a magnetic flux density (B2) of 0.6 to 0.9 T (6 kG to 9 kG) measured at 160 A/m (20 Oe).
  • the said at least one transition metal element may be Mo.
  • composition of this amorphous magnetic alloy is hereinafter referred to as the first composition, and does not fall within the scope of the present invention (in the latter the whole of the region bounded by the curve X is excluded).
  • An amorphous magnetic alloy having the first composition has a low pulse-resistance deterioration.
  • the present invention provides a core of a noise filter comprising a coiled thin strip of an amorphous magnetic alloy, wherein said alloy essentially consists of a first component (A) which is Fe and Mo, a second component (B) which is at least one selected from the group consisting of Si and Al, and a third (C) component which is at least one selected from the group consisting of B, C, and P, said first, second and third components being contained in an amount falling within an area defined by a curve Y and on the line of said curve Y and falling outside the curve X shown in Fig.
  • said alloy having the Mo content of 3% up to 7%, and exhibiting a permeability ( ⁇ 2) of approximately 4,000 or more measured at 100 kHz and a magnetic field of 0.16 A/m (2 mOe), a residual flux density (Br) of 0.3 T (3 kG) or less determined in a BH curve measured at a frequency of 2 kHz and a maximum applied magnetic field of 160A/m (2 Oe), and a magnetic flux density (B2) of 0.5 to 1.1 T (5 kG to 11 kG) measured at 160 A/m (2 Oe).
  • 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 Part 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 0.16 A/m. 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 or 1600 A/m (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 ( ⁇ e) is the greatest at 320 A/m (4 Oe) of the applied magnetic field. That is, when a mangetic field of 320 A/m (4 Oe) is applied to the amorphous alloy cores, the permeability ( ⁇ e) is reduced by approximately 30% compared with the permeability ( ⁇ e) before application of the magnetic field, i.e., the permeability ( ⁇ e) which an amorphous alloy primarily exhibits.
  • 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.
  • the pulse-resistance deterioration percentage is appropriately controlled, pulse-resistance deterioration which may occur at a magnetic field higher than 320 A/m (4 Oe) can be controlled.
  • the permeability ( ⁇ 2) represents the noise-pulse suppression characteristics of a core to which a magnetic field higher than 0.16 A/m (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 s ) 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 B2 , the heat treatment for precipitating the fine crystals is carried out. In this case, the above-described Br and B2 can also be attained by a heat treatment which does not result in appreciable precipitation of fine crystals.
  • the Br is as low as possible and may actually be zero (Br ⁇ 0), provided that B2 and ⁇ 2 are as specified above, since an amorphous alloy actually having a zero Br can provide a core which has a small deterioration due to noise-pulse voltage, i.e., low variance in inductance, and which can stably eliminate a high-voltage pulse.
  • Table 1 shows the properties of the amorphous alloy having an Fe 76-x Mo x Si6B18 composition. As is apparent from Table 1, the pulse-resistance deterioration percentage is drastically decreased due to the addition of Mo.
  • the ⁇ 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 0.16 A/m 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 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 ( ⁇ 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 ( ⁇ 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 0.3 T (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 ( ⁇ 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 800 A/m (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 s ) 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 ⁇ 2 (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 (B2) 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 ( ⁇ 2) is generally low, e.g., approximately 3000.
  • the permissible input voltage of noise disadvantageously becomes low.
  • the magnetic flux density (B2) 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 Fe75Mo5Si12B8 , 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 s ) (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 Fe73Mo5Si9B13 amorphous alloy (the second composition) was subjected to various heat treatments to change the ⁇ 2 (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 ⁇ 2 (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 parent 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 straps 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.

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Claims (2)

  1. Noyau d'un filtre de bruit comprenant une bande mince enroulée en alliage magnétique amorphe, caractérisé en ce que ledit alliage est essentiellement constitué d'un premier composant (A) qui est Fe et Mo, d'un deuxième composant (B) qui est au moins un élément choisi dans le groupe constitué de Si et Al, et d'un troisième composant (C) qui est au moins un élément choisi dans le groupe constitué de B, C, et P, lesdits premier, deuxième et troisième composants étant contenus en une quantité entrant dans une aire définie par une courbe Y et sur la ligne de ladite courbe Y et à l'extérieur de la courbe X représentée à la figure 3, ledit alliage ayant une teneur en Mo de 3 % jusqu'à 7 %, et présentant une perméabilité (µ₂) d'approximativement 4 000 ou plus, mesurée à 100 kHz et sous un champ magnétique de 0,16 A/m (2 mOe), ainsi qu'une densité de flux résiduel (Br) de 0,3 T (3 kG) ou moins, déterminée dans une courbe BH mesurée à une fréquence de 2 kHz et sous un champ magnétique maximal appliqué de 160 A/m (2 Oe), et une densité de flux magnétique (B₂) de 0,5 à 1,1 T (5 kG à 11 kG) mesurée à 160 A/m (2 Oe).
  2. Noyau selon la revendication 1, ayant de 0 à -10 % de pourcentage de détérioration de la résistance à une impulsion, qui est défini par l'équation :
    Figure imgb0012
     où µe est la perméabilité à 100 kHz et 0,16 A/m (2 mOe).
EP90105789A 1983-11-05 1984-11-02 Noyeau d'un filtre de bruit comportant un alliage amorphe Expired - Lifetime EP0384491B1 (fr)

Applications Claiming Priority (5)

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
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
JP204141/84 1984-10-01
EP19840307588 EP0145245B1 (fr) 1983-11-05 1984-11-02 Noyeau d'un filtre de bruit comportant un alliage amorphe

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP19840307588 Division EP0145245B1 (fr) 1983-11-05 1984-11-02 Noyeau d'un filtre de bruit comportant un alliage amorphe
EP84307588.8 Division 1984-11-02

Publications (3)

Publication Number Publication Date
EP0384491A2 EP0384491A2 (fr) 1990-08-29
EP0384491A3 EP0384491A3 (fr) 1991-01-09
EP0384491B1 true EP0384491B1 (fr) 1994-08-10

Family

ID=26514300

Family Applications (2)

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
EP19840307588 Expired - Lifetime EP0145245B1 (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
EP19840307588 Expired - Lifetime EP0145245B1 (fr) 1983-11-05 1984-11-02 Noyeau d'un filtre de bruit comportant un alliage amorphe

Country Status (2)

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EP (2) EP0384491B1 (fr)
DE (2) DE3484231D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3526047A1 (de) * 1985-07-20 1987-01-22 Vacuumschmelze Gmbh Stromkompensierte funkentstoerdrossel
US4859256A (en) * 1986-02-24 1989-08-22 Kabushiki Kaisha Toshiba High permeability amorphous magnetic material
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
DE69903997T2 (de) 1998-07-10 2003-09-18 Lucas Sa G Verteilungsmaschine für Viehfutter und ähnliches

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3165416D1 (en) * 1980-12-29 1984-09-13 Allied Corp Amorphous metal alloys having enhanced ac magnetic properties
JPS57190304A (en) * 1981-05-19 1982-11-22 Hitachi Metals Ltd Magnetic material
US4473413A (en) * 1983-03-16 1984-09-25 Allied Corporation Amorphous alloys for electromagnetic devices

Also Published As

Publication number Publication date
EP0145245A2 (fr) 1985-06-19
DE3486331T2 (de) 1995-04-06
EP0384491A2 (fr) 1990-08-29
DE3486331D1 (de) 1994-09-15
DE3484231D1 (de) 1991-04-11
EP0145245B1 (fr) 1991-03-06
EP0145245A3 (en) 1987-01-28
EP0384491A3 (fr) 1991-01-09

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