US4414521A
Expired / Lapsed
US
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Low reluctance transformer core
Assignee: 3M Co
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Filing: 1981-03-23
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Granted: 1983-11-08
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Expires: 2001-03-23
Abstract
Abstract A low reluctance transformer core utilizing first and second members, each having a leg element tapered in opposite directions. The tapered leg elements have continuous tapered interfaces designed to cooperatively mate with a wedging action forming a low reluctance leg.
Inventors
- 👤 Daniel E. Reisem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:05
CPC Classifications
H; H01; H01F; H01F3/00; H01F3/10; H01F7/00; H01F7/06; H01F7/08; H01F7/14; H01H; H01H50/00; H01H50/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
163 words
A ferromagnetic core having a source of operating flux for establishing a magnetic field in said core, comprising: a first member having first and second leg elements tapered in opposite directions; and a second member having first and second leg elements tapered in opposite directions; said tapered leg elements each having a continuous tapered interface, said continuous tapered interface of said first member being oriented opposite to said continuous tapered interface of said second member, said continuous tapered interfaces adapted to cooperatively mate with a wedging action; said first and second leg elements of said first member and said second member having a coefficient of friction with respect to each other, said continuous tapered interfaces of said first and second leg elements of said first member and said second member forming a taper angle, the value of the tangent of said taper angle being not more than the value of said coefficient of friction; whereby low reluctance first and second legs are formed.
Claim 2
Dependent Claim
163 words
A ferromagnetic core having a source of operating flux for establishing a magnetic field in said core, comprising: a first member having first and second leg elements tapered in opposite directions; and a second member having first and second leg elements tapered in opposite directions; said tapered leg elements each having a continuous tapered interface, said continuous tapered interface of said first member being oriented opposite to said continuous tapered interface of said second member, said continuous tapered interfaces adapted to cooperatively mate with a wedging action; said first and second leg elements of said first member and said second member having a coefficient of friction with respect to each other, said continuous tapered interfaces of said first and second leg elements of said first member and said second member forming a taper angle, the value of the tangent of said taper angle being not more than the value of said coefficient of friction; whereby low reluctance first and second legs are formed.
Claim 3
Dependent Claim
42 words
A ferromagnetic core as in claim 1 wherein said continuous tapered interfaces of said first and second leg elements of said first member and said second member form a taper angle of from greater than zero to not more than 35 degrees.
Claim 4
Dependent Claim
15 words
A ferromagnetic core as in claim 2 wherein said taper angle is approximately fifteen degrees.
Claim 5
Dependent Claim
53 words
A ferromagnetic core as in claim 1 wherein: a primary winding formed around said first leg element; and a secondary winding formed around said second leg element; where said primary winding is adapted to be connected to a power source; and where said secondary winding is adapted to be connected to a load.
Claim 6
Dependent Claim
211 words
A ferromagnetic core having opposed pole faces defining a gap of the type adapted for use in an electromagnetic device having a source of operating flux for establishing a magnetic field in said gap, an armature mounted for selective contact with either of said pole faces, and having a source of latching flux for retaining said armature in contact with either of said pole faces, comprising: a first member having first and second leg elements tapered in opposite directions; and a second member having first and second leg elements tapered in opposite directions; said tapered leg elements each having a continuous tapered interface, said continuous tapered interface of said first member being oriented opposite to said continuous tapered interface of said second member, said continuous tapered interfaces adapted to cooperatively mate with a wedging action; said first and second leg elements of said first member and said second member having a coefficient of friction with respect to each other, said continuous tapered interfaces of said first and second leg elements of said first member and said second member forming a taper angle, the value of the tangent of said taper angle being not more than the value of said coefficient of friction; whereby low reluctance first and second legs are formed.
Claim 7
Dependent Claim
211 words
A ferromagnetic core having opposed pole faces defining a gap of the type adapted for use in an electromagnetic device having a source of operating flux for establishing a magnetic field in said gap, an armature mounted for selective contact with either of said pole faces, and having a source of latching flux for retaining said armature in contact with either of said pole faces, comprising: a first member having first and second leg elements tapered in opposite directions; and a second member having first and second leg elements tapered in opposite directions; said tapered leg elements each having a continuous tapered interface, said continuous tapered interface of said first member being oriented opposite to said continuous tapered interface of said second member, said continuous tapered interfaces adapted to cooperatively mate with a wedging action; said first and second leg elements of said first member and said second member having a coefficient of friction with respect to each other, said continuous tapered interfaces of said first and second leg elements of said first member and said second member forming a taper angle, the value of the tangent of said taper angle being not more than the value of said coefficient of friction; whereby low reluctance first and second legs are formed.
Claim 8
Dependent Claim
42 words
A ferromagnetic core as in claim 5 wherein said continuous tapered interfaces of said first and second leg elements of said first member and said second member form a taper angle of from greater than zero to not more than 35 degrees.
Claim 9
Dependent Claim
15 words
A ferromagnetic core as in claim 6 wherein said taper angle is approximately fifteen degrees.
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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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |