US5069731A
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Low-frequency transformer
Assignee: Proterial Ltd
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Filing: 1989-03-23
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Granted: 1991-12-03
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Expires: 2009-03-23
Abstract
Abstract A low-frequency transformer including a magnetic core made of an alloy having the composition represented by the general formula: (Fe.sub.1-a M.sub.a).sub.100-x-y-z-α Cu.sub.x Si.sub.y B.sub.z M'.sub.α (atomic %) wherein M is Co and/or Ni, M' is at least one element selected from the group consisting of Nb, W, Ta, Mo, Zr, Hf and Ti, and a, x, y, z and α respectively satisfy 0≦a≦0.3, 0.1≦x≦3, 0≦y≦17, 4≦z≦17, 10≦y+z≦28 and 0.1≦α≦5, at least 50% of the alloy structure being occupied by fine crystal grains having an average grain size of 1000 Å or less when measured by their maximum diameters. The alloy may further contain at least one element selected from the group consisting of Ge, P, C, Ga, Al and N.
Inventors
- 👤 Yoshihito Yoshizawa
- 👤 Kiyotaka Yamauchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:49
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15308; C; C22; C22C; C22C45/00; C22C45/02; H01F27/00; H01F27/24; H01F27/25
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
97 words
A low-frequency transformer comprising a magnetic core made of an alloy having the composition represented by the general formula: (Fe.sub.1-a M.sub.a).sub.100-x-y-z-α Cu.sub.x Si.sub.y B.sub.z M'.sub.α (atomic %) wherein M is Co and/or Ni, M' is at least one element selected from the group consisting of Nb, W, Ta, Mo, Zr, Hf and Ti, and a, x, y, z and α respectively satisfy 0≦a≦0.3, 0.1≦x≦3, 0≦y≦17, 4≦z≦17, 10≦y+z≦28 and 0.1≦α≦5, at least 50% of the alloy structure being occupied by fine crystal grains having an average grain size of 1000Å or less when measured by their maximum diameters.
Claim 2
Dependent Claim
97 words
A low-frequency transformer comprising a magnetic core made of an alloy having the composition represented by the general formula: (Fe.sub.1-a M.sub.a).sub.100-x-y-z-α Cu.sub.x Si.sub.y B.sub.z M'.sub.α (atomic %) wherein M is Co and/or Ni, M' is at least one element selected from the group consisting of Nb, W, Ta, Mo, Zr, Hf and Ti, and a, x, y, z and α respectively satisfy 0≦a≦0.3, 0.1≦x≦3, 0≦y≦17, 4≦z≦17, 10≦y+z≦28 and 0.1≦α≦5, at least 50% of the alloy structure being occupied by fine crystal grains having an average grain size of 1000Å or less when measured by their maximum diameters.
Claim 3
Dependent Claim
121 words
A low-frequency transformer comprising a magnetic core made of an alloy having the composition represented by the general formula: (Fe.sub.1-a M.sub.a).sub.100-x-y-z-α-γ Cu.sub.x Si.sub.y B.sub.z M'.sub.α X.sub.γ (by atomic %) wherein M is Co and/or Ni, M' is at least one element selected from the group consisting of Nb, W, Ta, Mo, Zr, Hf and Ti, X is at least one element selected from the group consisting of Ge, P, C, Ga, Al and N, and a, x, y, z, α and γ respectively satisfy 0≦a≦0.3, 0.1≦x≦3, 0≦y≦10, 4≦z≦17, 0.1≦α≦5, γ≦4 and 10≦y+z+γ≦20, at least 50 % of the alloy structure being occupied by fine crystal grains having an average grain size of 1000Å or less when measured by their maximum diameters.
Claim 4
Dependent Claim
121 words
A low-frequency transformer comprising a magnetic core made of an alloy having the composition represented by the general formula: (Fe.sub.1-a M.sub.a).sub.100-x-y-z-α-γ Cu.sub.x Si.sub.y B.sub.z M'.sub.α X.sub.γ (by atomic %) wherein M is Co and/or Ni, M' is at least one element selected from the group consisting of Nb, W, Ta, Mo, Zr, Hf and Ti, X is at least one element selected from the group consisting of Ge, P, C, Ga, Al and N, and a, x, y, z, α and γ respectively satisfy 0≦a≦0.3, 0.1≦x≦3, 0≦y≦10, 4≦z≦17, 0.1≦α≦5, γ≦4 and 10≦y+z+γ≦20, at least 50 % of the alloy structure being occupied by fine crystal grains having an average grain size of 1000Å or less when measured by their maximum diameters.
Claim 5
Dependent Claim
18 words
The low-frequency transformer according to claim 1, wherein said alloy satisfies 0≦a≦0.3, 0.5≦x≦2, 0≦y≦15, 7≦z≦15, 15≦y+z≦25 and 1≦α≦3.
Claim 6
Dependent Claim
19 words
The low-frequency transformer according to claim 2, wherein said alloy satisfies 0≦a≦0.3, 0.5≦x≦2, 0≦y≦10, 7≦z≦15, 10≦y+z+γ≦20, 1≦α≦3, and 0.1≦γ≦3.
Claim 7
Dependent Claim
19 words
The low-frequency transformer according to claim 1 or 2, wherein the balance of said alloy structure is substantially amorphous.
Claim 8
Dependent Claim
19 words
The low-frequency transformer according to claim 1 or 2, wherein said alloy structure substantially consists of fine crystal grains.
Claim 9
Dependent Claim
21 words
The low-frequency transformer according to claim 1, wherein the average grain size of said fine crystal grains is 500Å or less.
Claim 10
Dependent Claim
22 words
The low-frequency transformer according to claim 1, wherein said alloy has a saturation magnetic flux density Bs of 13 kG or more.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |