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US4587507A
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Core of a choke coil comprised of amorphous magnetic alloy
Assignee: TDK Corp
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Filing: 1982-11-23
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Granted: 1986-05-06
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Expires: 2002-11-23
Abstract
Abstract Conventionally, silicon steel strips and ferrite cores have been used as the core of a choke coil. These strips and the like have not yet been replaced with amorphous alloy because in the known amorphous magnetic alloy the pre-magnetization characteristic, the amount of heat generated, and the secular change are poor. The present invention proposes a core of a choke coil which consists of a coiled thin strip of an amorphous alloy, and has at least one cut air gap, the coiled regions of the thin strip being bound to one another at at least in the neighborhood of said at least one cut air gap, and said amorphous magnetic alloy is essentially comprised of the following composition, Fe x Mn y (Si p B q P r C s ) z , wherein x+y+z is 100 atomic % based on all of the elements, y is from 0.001 to 10 atomic %, z is from 21 to 25.5 atomic %, p+q+r+s is atomic % 1, p is from 0.40 to 0.75, r is fro 0.0001 to 0.05, the ratio s/q is from 0.03 to 0.4, and z is z≦50p+1, z≦10p+19, z≧30p+2, and z≧13p+13.7.
Inventors
- 👤 Suguru Takayama
- 👤 Masao Shigeta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:05
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/25; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15358
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
131 words
A core of a choke coil which consists of a coiled thin strip of an amorphous alloy, and has at least one cut air gap, the coiled regions of the thin strip being bound to one another at least in the neighborhood of said at least one cut air gap, and said amorphous magnetic alloy contains precipitated fine crystals and consist essentially of the following composition: Fe.sub.x Mn.sub.y (Si.sub.p B.sub.q P.sub.r C.sub.s).sub.z, wherein x+y+z is 100 atomic % based on all of the elements, y is from 0.001 to 10 atomic %, z is from 21 to 25.5 atomic %, p+q+r+s is 1, p is from 0.40 to 0.75, r is from 0.0001 to 0.05, the ratio s/q is from 0.03 to 0.4, and z is z≦50p+1, z≦10p+19, z≧30p+2, and z≧13p+13.7.
Claim 2
Dependent Claim
131 words
A core of a choke coil which consists of a coiled thin strip of an amorphous alloy, and has at least one cut air gap, the coiled regions of the thin strip being bound to one another at least in the neighborhood of said at least one cut air gap, and said amorphous magnetic alloy contains precipitated fine crystals and consist essentially of the following composition: Fe.sub.x Mn.sub.y (Si.sub.p B.sub.q P.sub.r C.sub.s).sub.z, wherein x+y+z is 100 atomic % based on all of the elements, y is from 0.001 to 10 atomic %, z is from 21 to 25.5 atomic %, p+q+r+s is 1, p is from 0.40 to 0.75, r is from 0.0001 to 0.05, the ratio s/q is from 0.03 to 0.4, and z is z≦50p+1, z≦10p+19, z≧30p+2, and z≧13p+13.7.
Claim 3
Dependent Claim
30 words
A core of a choke coil according to claim 1, wherein z is from 22.5 to 24.5 atomic %, p is from 0.55 to 0.72, z≦10p+18, z≦-25p+42, z≧50p-12 and z≧10p+16.
Claim 4
Dependent Claim
23 words
A core of a choke coil according to claim 1, wherein y is in the range of from 0.1 to 5 atomic %.
Claim 5
Dependent Claim
21 words
A core of a choke coil according to claim 1, wherein r is in the range of from 0.0001 to 0.01.
Claim 6
Dependent Claim
17 words
A core of a choke coil according to claim 1, wherein s is from 0.007 to 0.229.
Claim 7
Dependent Claim
17 words
A core of a choke coil according to claim 1, wherein q is from 0.143 to 0.571.
Claim 8
Dependent Claim
27 words
A core of a choke coil according to claim 1, wherein magnetic anisotropy is induced in the strip in a predetermined direction parallel to the sheet surface.
Claim 9
Dependent Claim
28 words
A core of a choke coil according to claim 1, wherein one-axis magnetic anisotropy is induced in the strip in a predetermined direction parallel to the sheet surface.
Claim 10
Dependent Claim
37 words
A core of a choke coil according to claim 1, wherein magnetic anisotropy is induced in a direction which is slanted with respect to the axial direction of a coiled thin strip of an amorphous magnetic alloy.
Claim 11
Dependent Claim
27 words
A core of a choke coil according to claim 1, wherein magnetic anisotropy is induced by heat treating said coiled thin strip of an amorphous magnetic alloy.
Claim 12
Dependent Claim
30 words
A core of a choke coil according to claim 1, wherein said precipitated fine crystals are formed by heat treatment of a completely vitrified thin strip of the amorphous alloy.
Claim 13
Dependent Claim
29 words
A core of a choke coil according to claim 1, wherein the core comprises core members, each of which consists of a thin strip of an amorphous magnetic alloy.
Claim 14
Dependent Claim
53 words
A core of a choke coil according to claim 1, wherein the core comprises core members, each of which consists of a thin strip of an amorphous magnetic alloy and each of which has a predetermined shape, formed by cutting a coiled thin strip of an amorphous magnetic alloy thin strip into shape.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |