US4761630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butt-lap-step core joint
Assignee: ABB Inc USA
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Filing: 1987-10-09
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Granted: 1988-08-02
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Expires: 2007-10-09
Abstract
Abstract An improved transformer core joint for use in connection with amorphous metal transformers which includes a plurality of spirally wound laminations that are divided into a plurality of groups of laminations. The laminations within a group of laminations essentially provide a butt joint within the group while adjacent groups of laminations form a lap joint with each other. The groups of laminations are divided into sets of groups and a step either in the direction of the spiral or against the direction of the spiral occurs between each of the sets of groups. The joint of the invention provides a compact, easily disassembled and reassembled core joint for accommodating the manufacture of amorphous metal transformer cores.
Inventors
- 👤 Frank H. Grimes
- 👤 Eugenius Hammack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:02
CPC Classifications
H; H01; H01F; H01F3/00; H01F27/00; H01F27/24; H01F27/245; H01F27/2455
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
145 words
An improved transformer core having a butt-lap-step transformer core joint, said transformer core comprising: a plurality of laminations cut from a continuous spiral of material, said plurality of laminations divided into a plurality of groups of laminations; laminations within each group being cut to form a butt joint with other laminations of said group; each group of laminations being offset laterally from its adjacent group of laminations for form a lap joint with said adjacent group, the end lamination of each group being of a different length than the majority of laminations within said group and forming the end lamination of the next adjacent group, a preselected number of said groups of laminations comprising a set of groups wherein the lamination interconnecting two sets of groups is of a substantially different length than the balance of the laminations within said groups and define a step.
Claim 2
Dependent Claim
145 words
An improved transformer core having a butt-lap-step transformer core joint, said transformer core comprising: a plurality of laminations cut from a continuous spiral of material, said plurality of laminations divided into a plurality of groups of laminations; laminations within each group being cut to form a butt joint with other laminations of said group; each group of laminations being offset laterally from its adjacent group of laminations for form a lap joint with said adjacent group, the end lamination of each group being of a different length than the majority of laminations within said group and forming the end lamination of the next adjacent group, a preselected number of said groups of laminations comprising a set of groups wherein the lamination interconnecting two sets of groups is of a substantially different length than the balance of the laminations within said groups and define a step.
Claim 3
Dependent Claim
24 words
The improved transformer core according to claim 1, wherein said lateral offset between said groups of laminations is in the direction of said spiral.
Claim 4
Dependent Claim
49 words
The improved transformer core according to claim 2, wherein said laminations of a different length are longer than the balance of said laminations within said group and the lamination interconnecting a set of groups with an adjacent set of groups is substantially shorter than the laminations within said groups.
Claim 5
Dependent Claim
23 words
The improved transformer core according to claim 1, wherein said lateral offset is in a direction opposite to the direction of said spiral.
Claim 6
Dependent Claim
49 words
The improved transformer core according to claim 4, wherein said laminations of a different length are shorter than the balance of said laminations within said groups and the lamination interconnecting a set of groups with an adjacent set of groups is substantially longer than the laminations within said groups.
Claim 7
Dependent Claim
23 words
The improved transformer core according to claim 1, wherein the number of laminations in a group is between about 5 to 30 laminations.
Claim 8
Dependent Claim
27 words
The improved transformer core according to claim 1, wherein the number of groups of laminations in a set of groups is between about 5 and 25 groups.
Claim 9
Dependent Claim
16 words
The improved transformer core according to claim 1 wherein said spiral of material is amorphous metal.
Claim 10
Dependent Claim
16 words
The improved transformer core according to claim 8 wherein each lamination is approximately 1 mil thick.
Claim 11
Dependent Claim
123 words
In a transformer, an improved transformer core having a butt-lap-step transformer core joint, said transformer core comprising: a plurality of laminations, said plurality of laminations divided into a plurality of groups of laminations; the majority of laminations in each group being cut to form a butt joint within said group; each group of laminations being offset laterally from its adjacent group of laminations to form a lap joint with said adjacent group, a preselected number of said groups of laminations comprising a set of groups wherein the innermost lamination of the innermost group of one set of groups and the outermost group of an adjacent set of groups is of a substantially different length than the balance of the laminations within said groups.
Claim 12
Dependent Claim
123 words
In a transformer, an improved transformer core having a butt-lap-step transformer core joint, said transformer core comprising: a plurality of laminations, said plurality of laminations divided into a plurality of groups of laminations; the majority of laminations in each group being cut to form a butt joint within said group; each group of laminations being offset laterally from its adjacent group of laminations to form a lap joint with said adjacent group, a preselected number of said groups of laminations comprising a set of groups wherein the innermost lamination of the innermost group of one set of groups and the outermost group of an adjacent set of groups is of a substantially different length than the balance of the laminations within said groups.
Claim 13
Dependent Claim
30 words
The improved transformer core according to claim 10, wherein said core comprises a spiral and said lateral offset between said groups of laminations is in the direction of said spiral.
Claim 14
Dependent Claim
25 words
The improved transformer core according to claim 11, wherein said lamination of a substantially different length is substantially shorter than the balance of said laminations.
Claim 15
Dependent Claim
29 words
The improved transformer core according to claim 10, wherein said core comprises a spiral and said lateral offset is in a direction opposite to the direction of said spiral.
Claim 16
Dependent Claim
25 words
The improved transformer core according to claim 13, wherein said lamination of a substantially different length is substantially longer than the balance of said laminations.
Claim 17
Dependent Claim
23 words
The improved transformer core according to claim 10, wherein the number of laminations in a group is between about 5 and 30 laminations.
Claim 18
Dependent Claim
27 words
The improved transformer core according to claim 10, wherein the number of groups of laminations in a set of groups is between about 5 and 25 groups.
Claim 19
Dependent Claim
14 words
The improved transformer core according to claim 10 wherein said laminations comprise amporphous metal.
Claim 20
Dependent Claim
16 words
The improved transformer core according to claim 17 wherein each lamination is approximately 1 mil thick.
Claim 21
Dependent Claim
34 words
The improved transformer core according to claim 10 wherein the number of laminations in a group of laminations is about 15 and the number of groups in a set of groups is about 9.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-02 | 1992-02-01 | 1992-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-02 | 1996-02-01 | 1996-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-02 | 2000-02-01 | 2000-08-02 | $7700.00 | Window Closed / Lapsed |