EP0145245A2
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EP
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Core of a noise filter comprised of an amorphous alloy
Assignee: TDK Corp
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Filing: 1984-11-02
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Granted: —
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Expires: 2004-11-02
Abstract
Abstract The present invention relates to the core of a noise filter. Conventionally, ferrite or iron powder is used as the core of a noise filter. Some patent publications disclose the core of a noise filter made of an amorphous magnetic alloy. An amorphous magnetic alloy which has a low pulse- noise resistance deterioration percentage is that on or within the curve X and Y of Figure 3.
Inventors
- 👤 Suguru Takayama
- 👤 Masao Shigeta
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 15:39
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15308; H01F3/00; H01F3/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
179 words
A core of a noise filter comprising a coiled thin strip of an amorphous magnetic alloy, characterized in that, said amorphous magnetic alloy essentially consisting 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 Al and Si, and a C component which is at least one selected from the group consisting of B, C, and P, containing the A, B, and C elements in an amount falling on or within curve X shown in Fig. 3, and exhibiting a permeability (u 2 ) of from approximately 2,000 to approximately 5,000, i.e., a permeability measured at 100 kHz and a magnetic field of 2 mOe, 3 kG or less of a residual flux density (Br) determined in a BH curve at a frequency of 2 kHz and a maximum applied magnetic field of 2 Oe, and from 6 kG to 9 kG of a magnetic flux density (B 2 ), i.e., a magnetic flux density at 2 Oe.
Claim 2
Dependent Claim
179 words
A core of a noise filter comprising a coiled thin strip of an amorphous magnetic alloy, characterized in that, said amorphous magnetic alloy essentially consisting 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 Al and Si, and a C component which is at least one selected from the group consisting of B, C, and P, containing the A, B, and C elements in an amount falling on or within curve X shown in Fig. 3, and exhibiting a permeability (u 2 ) of from approximately 2,000 to approximately 5,000, i.e., a permeability measured at 100 kHz and a magnetic field of 2 mOe, 3 kG or less of a residual flux density (Br) determined in a BH curve at a frequency of 2 kHz and a maximum applied magnetic field of 2 Oe, and from 6 kG to 9 kG of a magnetic flux density (B 2 ), i.e., a magnetic flux density at 2 Oe.
Claim 3
Dependent Claim
39 words
A core according to claim 1, wherein said at least one transition metal element is selected from the group consisting of Co, Ni, Cr, Cu, Mo, Nb, Mn, Ti, W, V, Zr, Ta, Y, and a rare earth element.
Claim 4
Dependent Claim
16 words
A core according to claim 2, wherein said at least one transition metal element is Mn.
Claim 5
Dependent Claim
40 words
A core according to claims 1, 2 or 3, said core having from 0 to -10% of a pulse-resistance deterioration percentage which is defined by the equation: wherein pe is the permeability at 100 kHz and 2 mOe (0.002 Oe).
Claim 6
Dependent Claim
182 words
A core of a noise filter comprising a coiled thin strip of an amorphous magnetic alloy, characterized in that said alloy essentially consists of an A component which is Fe and Mo, 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 Al, contains the A, B, and C elements in an amount falling on or within curve Y and falling outside the curve X shown in Fig. 3, the Mo content is up to 7%, and exhibits a permeability (µ 2 ) of approximately 4,000 or more, i.e., a permeability measured at 100 kHz and a magnetic field of 2 moe, a 3 kG or less of a residual flux density (Br) determined on a BH curve at a frequency of 2 kHz and a maximum applied a magnetic field of 2 Oe, and from 5 kG to 11 kG of a magnetic flux density (B 2 ), i.e., a magnetic flux density at 2 Oe.
Claim 7
Dependent Claim
182 words
A core of a noise filter comprising a coiled thin strip of an amorphous magnetic alloy, characterized in that said alloy essentially consists of an A component which is Fe and Mo, 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 Al, contains the A, B, and C elements in an amount falling on or within curve Y and falling outside the curve X shown in Fig. 3, the Mo content is up to 7%, and exhibits a permeability (µ 2 ) of approximately 4,000 or more, i.e., a permeability measured at 100 kHz and a magnetic field of 2 moe, a 3 kG or less of a residual flux density (Br) determined on a BH curve at a frequency of 2 kHz and a maximum applied a magnetic field of 2 Oe, and from 5 kG to 11 kG of a magnetic flux density (B 2 ), i.e., a magnetic flux density at 2 Oe.
Claim 8
Dependent Claim
14 words
A core according to claim 5, wherein the Mo content is 3% or more.
Claim 9
Dependent Claim
37 words
A core according to claim 5, said core having from 0 to -10% of a pulse-resistance deterioration percentage which is defiend by the equation: wherein µe is the permeability at 100 kHz and 2 mOe (0.002 Oe).
References Cited (Backward Citations)
No citation records indexed.
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