Patent US5248952A successfully refreshed from Google Patents.
US5248952A
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Transformer core and method for finishing
Assignee: Kuhlman Electric Corp
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Filing: 1992-01-14
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Granted: 1993-09-28
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Expires: 2012-01-14
Abstract
Abstract A finished transformer core (48) includes a core (2) of wound amorphous transformer core material (4) to which rigidifying bonding material (22) is applied to the ends (12, 14) of the core. The bonding material does not cover the entire ends but leaves gaps (24) to permit fluid flow between the ambient environment and the interlamination voids (16) which exist between the layers (18, 20) of the wound material. The core, rigidified by the bonding material, is housed within a fluid permeable containment assembly (28). The containment assembly typically includes fluid permeable filter material (32, 34, 36, 38) which allows transformer oil and air to pass through the material but will trap solid particles of core material within the containment assembly.
Inventors
- 👤 Phillip I. Bisbee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:39
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0213; H01F41/0226; H01F27/00; H01F27/24; H01F27/25; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49078
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
102 words
A method for finishing a core of layered amorphous transformer core material with the edges of the transformer material defining ends of the material, the transformer material defining interlamination voids between the layers of the transformer material, the method comprising the following steps: applying a bonding material to the edges of the transformer core material covering a first portion of a first said end; maintaining a second portion of the first end free of said bonding material, the second portion being formed of small gaps distributed throughout the entire first portion; and curing the bonding material thereby rigidifying said core of material.
Claim 2
Independent Claim
102 words
A method for finishing a core of layered amorphous transformer core material with the edges of the transformer material defining ends of the material, the transformer material defining interlamination voids between the layers of the transformer material, the method comprising the following steps: applying a bonding material to the edges of the transformer core material covering a first portion of a first said end; maintaining a second portion of the first end free of said bonding material, the second portion being formed of small gaps distributed throughout the entire first portion; and curing the bonding material thereby rigidifying said core of material.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein at least the second portion of the first end is covered by a fluid permeable filter material.
Claim 4
Dependent Claim
27 words
The finishing method of claim 1 wherein the applying step is carried out by applying the bonding material to the first end and a second said end.
Claim 5
Dependent Claim
29 words
The finishing method of claim 1 wherein the maintaining step is carried out by maintaining between about 5% and 50% of the first end free of said bonding material.
Claim 6
Dependent Claim
42 words
The finishing method of claim 1 wherein the applying step is carried out by applying the bonding material to a fluid-permeable layer and the bonding the fluid-permeable layer to the first end using the bonding material previously applied to the fluid-permeable material.
Claim 7
Dependent Claim
60 words
The finishing method of claim 1 further comprising the step of enclosing, after the curing step, the rigidified core of material with a particulate barrier material to form a particulate containment assembly which traps any particles of the wound material within the particulate containment assembly, at least a portion of the particulate barrier material including a fluid-permeable particulate filter material.
Claim 8
Dependent Claim
68 words
The finishing method of claim 6 further comprising the steps of: placing the transformer material in a vacuum chamber; subjecting the vacuum chamber to a vacuum to cause evacuation of air from the interlaminar voids through said second portion; and introducing transformer insulating fluid into the chamber while maintaining the vacuum until said core is immersed in said fluid, and then relieving said vacuum in said vacuum chamber.
Claim 9
Independent Claim
236 words
A method for finishing a core of coiled amorphous transformer core material of the type having inner and outer surfaces with the edges of the coiled transformer core material defining the first and second ends of the material, the transformer core material defining interlamination voids between the layers of the transformer material, the method comprising the following steps: applying a bonding material to the edges of the transformer core material covering about 50% to 95% of the first and second ends; maintaining the remainder of the first and second ends free of said bonding material, the remainder of the first and second ends being formed of small gaps distributed throughout the entire first and second ends; curing the bonding material thereby rigidifying the transformer core material; covering the first and second ends with a fluid-permeable particulate filter material and the inner and outer surfaces with a particulate barrier material to form a particulate containment assembly which traps any particles of the wound material within the particulate containment assembly; placing the rigidified, covered transformer core material in a vacuum chamber; subjecting the vacuum chamber to a vacuum to cause evacuation of air from the interlaminar voids through said portions of said ends which are free of bonding material; and introducing transformer insulating fluid into the chamber while maintaining the vacuum until said core is immersed in said fluid, and then relieving said vacuum in said vacuum chamber.
Claim 10
Independent Claim
236 words
A method for finishing a core of coiled amorphous transformer core material of the type having inner and outer surfaces with the edges of the coiled transformer core material defining the first and second ends of the material, the transformer core material defining interlamination voids between the layers of the transformer material, the method comprising the following steps: applying a bonding material to the edges of the transformer core material covering about 50% to 95% of the first and second ends; maintaining the remainder of the first and second ends free of said bonding material, the remainder of the first and second ends being formed of small gaps distributed throughout the entire first and second ends; curing the bonding material thereby rigidifying the transformer core material; covering the first and second ends with a fluid-permeable particulate filter material and the inner and outer surfaces with a particulate barrier material to form a particulate containment assembly which traps any particles of the wound material within the particulate containment assembly; placing the rigidified, covered transformer core material in a vacuum chamber; subjecting the vacuum chamber to a vacuum to cause evacuation of air from the interlaminar voids through said portions of said ends which are free of bonding material; and introducing transformer insulating fluid into the chamber while maintaining the vacuum until said core is immersed in said fluid, and then relieving said vacuum in said vacuum chamber.
Claim 11
Dependent Claim
42 words
The finishing method of claim 8 wherein the applying step is carried out by applying the bonding material to a fluid-permeable layer and then bonding the fluid-permeable layer to the first end using the bonding material previously applied to the fluid-permeable material.
Claim 12
Dependent Claim
110 words
A toroidal transformer core comprising: a coil of amorphous transformer core material, the core having inner and outer circumferential surfaces, the material having edges which define first and second ends of the core, the material being wound in layers; the material defining interlamination voids between the layers of the material; a first core-rigidifying bonding layer covering a first portion of the first end leaving a second portion of the first end free of said first bonding layer to permit fluid flow to and from said interlaminar voids through said second portion while rigidifying said core and the second portion being formed of small gaps distributed throughout the entire first portion.
Claim 13
Dependent Claim
110 words
A toroidal transformer core comprising: a coil of amorphous transformer core material, the core having inner and outer circumferential surfaces, the material having edges which define first and second ends of the core, the material being wound in layers; the material defining interlamination voids between the layers of the material; a first core-rigidifying bonding layer covering a first portion of the first end leaving a second portion of the first end free of said first bonding layer to permit fluid flow to and from said interlaminar voids through said second portion while rigidifying said core and the second portion being formed of small gaps distributed throughout the entire first portion.
Claim 14
Dependent Claim
18 words
The core of claim 10 wherein the second portion is about 5% to 50% of the first end.
Claim 15
Dependent Claim
34 words
The core of claim 10 further comprising a second core-rigidifying bonding layer covering a third portion of the second end leaving a fourth portion of the second end free of said second bonding layer.
Claim 16
Dependent Claim
31 words
The core of claim 10 further comprising a fluid-permeable particulate filter layer encompassing at least the second and fourth portions of the first and second ends of the core of material.
Claim 17
Dependent Claim
16 words
The core of claim 13 wherein the filter layer closely covers the first and second ends.
Claim 18
Dependent Claim
26 words
The core of claim 13 wherein the inner and outer circumferential surfaces are covered by a particulate barrier material so as to fully enclose the core.
Claim 19
Dependent Claim
32 words
The core of claim 15 wherein the filter layers covering the first and second ends, and the particulate barrier material covering the inner and outer circumferential surfaces comprise an electrical insulating material.
Claim 20
Dependent Claim
20 words
The core of claim 10 wherein the coil of transformer core material is an uncut coil of transformer core material.
Claim 21
Dependent Claim
144 words
A toroidal transformer core comprising: a coil of amorphous transformer core material, the coil having inner and outer circumferential surfaces, the material having edges which define first and second ends of the coil, the material being wound in layers; the material defining interlamination voids between the layers of the material; a first coil-rigidifying bonding layer covering about 50% to 95% of the first and second ends leaving the remainder of the first and second ends free of said first bonding layer to permit fluid flow to and from said interlaminar voids through said first and second ends while rigidifying said coil of material the remainder of the first and second ends being formed of small gaps distributed throughout the entire bonding layer; and a particulate barrier layer fully encompassing the rigidified core of material, at least a portion of the barrier layer being fluid-permeable.
Claim 22
Dependent Claim
144 words
A toroidal transformer core comprising: a coil of amorphous transformer core material, the coil having inner and outer circumferential surfaces, the material having edges which define first and second ends of the coil, the material being wound in layers; the material defining interlamination voids between the layers of the material; a first coil-rigidifying bonding layer covering about 50% to 95% of the first and second ends leaving the remainder of the first and second ends free of said first bonding layer to permit fluid flow to and from said interlaminar voids through said first and second ends while rigidifying said coil of material the remainder of the first and second ends being formed of small gaps distributed throughout the entire bonding layer; and a particulate barrier layer fully encompassing the rigidified core of material, at least a portion of the barrier layer being fluid-permeable.
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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) | 1996-09-27 | 1997-03-29 | 1997-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-27 | 2001-03-29 | 2001-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-27 | 2005-03-29 | 2005-09-28 | $7700.00 | Window Closed / Lapsed |