US5501747A
Expired / Lapsed
US
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High strength iron-cobalt-vanadium alloy article
Assignee: CRS Holdings LLC
•
Filing: 1995-05-12
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Granted: 1996-03-26
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Expires: 2015-05-12
Abstract
Abstract A soft magnetic article is disclosed which is formed of an alloy consisting essentially of, in weight percent, about ______________________________________ C 0.003-0.02 Mn 0.10 max. Si 0.10 max. P 0.01 max. S 0.003 max. Cr 0.1 max. Ni 0.2 max. Mo 0.1 max. Co 48-50 V 1.8-2.2 Nb 0.15-0.5 N 0.004 max. O 0.006 max. ______________________________________ with the balance essentially iron. The article is annealed at a temperature of not more than 740° C. (1364° F.) for not more than about 4 hours and provides a room temperature yield strength of at least about 620 MPa (90 ksi) in the annealed condition. Among the disclosed embodiments of the annealed article according to this invention are a rotor and a stator for a rotating electrical machine such as a motor, generator, alternator or a magnetic bearing.
Inventors
- 👤 Millard S. Masteller
- 👤 Douglas W. Dietrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:29
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0474; F16C32/048; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; C; C22; C22C; C22C19/00; C22C19/07; C22C38/00; C22C38/10; F16C32/0459; H02; H02K; H02K1/00; H02K1/02; F16C2202/00; F16C2202/30; F16C2202/40; F16C2202/42
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
96 words
A magnetic article formed of an alloy consisting essentially of, in weight percent, about ______________________________________
C 0.003-0.02
Mn 0.10 max.
Si 0.10 max.
P 0.01 max.
S 0.003 max.
Cr 0.1 max.
Ni 0.2 max.
Mo 0.1 max.
Co 48-50
V 1.8-2.2
Nb 0.15-0.5
N 0.004 max.
O 0.006 max.
______________________________________ and the balance essentially iron, said article having been annealed at a temperature of not more than 740° C. (1364° F.) for not more than about 4 hours, and said article having a room temperature yield strength of at least about 620 MPa (90 ksi).
Claim 2
Dependent Claim
96 words
A magnetic article formed of an alloy consisting essentially of, in weight percent, about ______________________________________
C 0.003-0.02
Mn 0.10 max.
Si 0.10 max.
P 0.01 max.
S 0.003 max.
Cr 0.1 max.
Ni 0.2 max.
Mo 0.1 max.
Co 48-50
V 1.8-2.2
Nb 0.15-0.5
N 0.004 max.
O 0.006 max.
______________________________________ and the balance essentially iron, said article having been annealed at a temperature of not more than 740° C. (1364° F.) for not more than about 4 hours, and said article having a room temperature yield strength of at least about 620 MPa (90 ksi).
Claim 3
Dependent Claim
14 words
The article in accordance with claim 1 which contains at least about 0.25% niobium.
Claim 4
Dependent Claim
14 words
The article in accordance with claim 1 which contains at least about 0.3% niobium.
Claim 5
Dependent Claim
18 words
The article in accordance with claim 1 which has been annealed for not more than about 2 hours.
Claim 6
Dependent Claim
22 words
The article in accordance with claim 1 which has been annealed at a temperature of at least about 720° C. (1328° F.).
Claim 7
Dependent Claim
149 words
A magnetic bearing comprising: a. a stator having a central opening therein; and b. a rotor positioned within the central opening of the stator, said rotor comprising a generally disk-shaped core having a diameter sized to enable the disk-shaped core to be positioned within the central opening of said stator, said disk-shaped core being formed of an alloy consisting essentially of, in weight percent, about ______________________________________
C 0.003-0.02
Mn 0.10 max.
Si 0.10 max.
P 0.01 max.
S 0.003 max.
Cr 0.1 max.
Ni 0.2 max.
Mo 0.1 max.
Co 48-50
V 1.8-2.2
Nb 0.15-0.5
N 0.004 max.
O 0.006 max.
______________________________________ and the balance essentially iron, said disk-shaped core having been annealed at a temperature of not more than 740° C. (1364° F.) for not more than about 4 hours, and said disk-shaped core having a room temperature yield strength of at least about 620 MPa (90 ksi).
Claim 8
Dependent Claim
149 words
A magnetic bearing comprising: a. a stator having a central opening therein; and b. a rotor positioned within the central opening of the stator, said rotor comprising a generally disk-shaped core having a diameter sized to enable the disk-shaped core to be positioned within the central opening of said stator, said disk-shaped core being formed of an alloy consisting essentially of, in weight percent, about ______________________________________
C 0.003-0.02
Mn 0.10 max.
Si 0.10 max.
P 0.01 max.
S 0.003 max.
Cr 0.1 max.
Ni 0.2 max.
Mo 0.1 max.
Co 48-50
V 1.8-2.2
Nb 0.15-0.5
N 0.004 max.
O 0.006 max.
______________________________________ and the balance essentially iron, said disk-shaped core having been annealed at a temperature of not more than 740° C. (1364° F.) for not more than about 4 hours, and said disk-shaped core having a room temperature yield strength of at least about 620 MPa (90 ksi).
Claim 9
Dependent Claim
62 words
The magnetic bearing in accordance with claim 6 wherein the stator comprises: a. a generally ring-shaped core having an inner perimeter; b. a plurality of radially directed spokes substantially equally spaced around the inner perimeter of the ring-shaped core, and projecting inwardly of the ring-shaped core; and c. a plurality of winding supports each positioned over one of the radially directed spokes.
Claim 10
Dependent Claim
20 words
The magnetic bearing in accordance with claim 6 wherein the rotor comprises a shaft extending axially through the disk-shaped core.
Claim 11
Dependent Claim
35 words
The magnetic bearing in accordance with claim 6 wherein the disk-shaped core is formed of a plurality of laminations, each lamination being generally ring-shaped and having an inner diameter dimensioned to receive a shaft therethrough.
Claim 12
Dependent Claim
17 words
The magnetic bearing in accordance with claim 6 wherein the alloy contains at least about 0.25% niobium.
Claim 13
Dependent Claim
17 words
The magnetic bearing in accordance with claim 6 wherein the alloy contains at least about 0.3% niobium.
Claim 14
Dependent Claim
22 words
The magnetic bearing in accordance with claim 6 wherein the disk-shaped core has been annealed for not more than about 2 hours.
Claim 15
Dependent Claim
26 words
The magnetic bearing in accordance with claim 6 wherein the disk-shaped core has been annealed at a temperature of at least about 720° C. (1328° F.).
Claim 16
Dependent Claim
121 words
A rotor for a rotating electrical machine comprising a drum sized to enable the drum to be positioned within a central opening of a stator, said drum being formed of an alloy consisting essentially of, in weight percent, about ______________________________________
C 0.003-0.02
Mn 0.10 max.
Si 0.10 max.
P 0.01 max.
S 0.003 max.
Cr 0.1 max.
Ni 0.2 max.
Mo 0.1 max.
Co 48-50
V 1.8-2.2
Nb 0.15-0.5
N 0.004 max.
O 0.006 max.
______________________________________ and the balance essentially iron, said drum having been annealed at a temperature of not more than 740° C. (1364° F.) for not more than about 4 hours, and said drum having a room temperature yield strength of at least about 620 MPa (90 ksi).
Claim 17
Dependent Claim
121 words
A rotor for a rotating electrical machine comprising a drum sized to enable the drum to be positioned within a central opening of a stator, said drum being formed of an alloy consisting essentially of, in weight percent, about ______________________________________
C 0.003-0.02
Mn 0.10 max.
Si 0.10 max.
P 0.01 max.
S 0.003 max.
Cr 0.1 max.
Ni 0.2 max.
Mo 0.1 max.
Co 48-50
V 1.8-2.2
Nb 0.15-0.5
N 0.004 max.
O 0.006 max.
______________________________________ and the balance essentially iron, said drum having been annealed at a temperature of not more than 740° C. (1364° F.) for not more than about 4 hours, and said drum having a room temperature yield strength of at least about 620 MPa (90 ksi).
Claim 18
Dependent Claim
17 words
The rotor in accordance with claim 14 wherein the drum is formed of a plurality of laminations.
Claim 19
Dependent Claim
16 words
The rotor in accordance with claim 14 wherein the alloy contains at least about 0.25% niobium.
Claim 20
Dependent Claim
16 words
The rotor in accordance with claim 14 wherein the alloy contains at least about 0.3% niobium.
Claim 21
Dependent Claim
20 words
The rotor in accordance with claim 14 wherein the drum has been annealed for not more than about 2 hours.
Claim 22
Dependent Claim
24 words
The rotor in accordance with claim 18 wherein the drum has been annealed at a temperature of at least about 720° C. (1328° F.).
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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) | 1999-03-26 | 1999-09-25 | 2000-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-26 | 2003-09-25 | 2004-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-26 | 2007-09-25 | 2008-03-26 | $7700.00 | Window Closed / Lapsed |