Patent US4239998A successfully refreshed from Google Patents.
US4239998A
Expired / Lapsed
US
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Method for electrically insulating an electrically conducting article and product produced thereby
Assignee: Hitachi Ltd
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Filing: 1978-03-14
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Granted: 1980-12-16
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Expires: 1998-03-14
Abstract
Abstract A method for producing electrically insulated apparatus, which may be used in windings for rotary electric machines, for example, an induction motor, synchronous machines, DC machines or stationary induction apparatus, for example, transformers, and the product produced thereby comprising an electric conductor and an insulating layer formed around the electric conductor, wherein said insulating layer contains a resin having excellent permeability for the gas generated in the layer, e.g., a silicone resin, and a resin having excellent adhesive force in an appropriate blending ratio in order to impart excellent thermal resistance to the electrically insulated apparatus.
Inventors
- 👤 Takeshi Hakamada
- 👤 Hideyo Hirata
- 👤 Toshio Katoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:23
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/323; H02; H02K; H02K3/00; H02K3/32; H02K3/325; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/251
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
104 words
A method for electrically insulating an electrically conducting article which conprises winding an insulating tape containing a first resin around an electrically conducting article, impregnating the wound insulating tape with a second resin, and curing the second resin, thereby forming an insulating layer around the electrically conducting article, characterized by the first resin being a silicone resin, by the second resin being a resin having a larger force of adhesion between the windings of the tape, after curing, than said first resin, after curing, and by a ratio of the second resin b to the first resin a being 0.5:1 to 5:1 by weight.
Claim 2
Independent Claim
104 words
A method for electrically insulating an electrically conducting article which conprises winding an insulating tape containing a first resin around an electrically conducting article, impregnating the wound insulating tape with a second resin, and curing the second resin, thereby forming an insulating layer around the electrically conducting article, characterized by the first resin being a silicone resin, by the second resin being a resin having a larger force of adhesion between the windings of the tape, after curing, than said first resin, after curing, and by a ratio of the second resin b to the first resin a being 0.5:1 to 5:1 by weight.
Claim 3
Dependent Claim
18 words
A method according to claim 1, wherein the second resin has a viscosity of less than 3 poise.
Claim 4
Dependent Claim
31 words
A method according to claim 1, wherein the second resin is a resin obtained by curing a resin composition consisting mainly of a polyfunctional isocyanate compound and a polyfunctional epoxy compound.
Claim 5
Dependent Claim
14 words
A method according to claim 1, wherein the second resin in an epoxy resin.
Claim 6
Dependent Claim
30 words
A method according to claim 1, wherein the insulating tape is a tape obtained by making integrated mica adhere to a glass cloth tape by means of the first resin.
Claim 7
Dependent Claim
30 words
A method according to claim 3, wherein the insulating tape is a tape obtained by making integrated mica adhere to a glass cloth tape by means of the first resin.
Claim 8
Dependent Claim
32 words
An electrically insulated, electrically conducting article comprising an electrically conducting article and an insulating layer comprising an insulating tape wound around the electrically conducting article, produced by the method of claim 1.
Claim 9
Dependent Claim
32 words
An electrically insulated, electrically conducting article comprising an electrically conducting article and an insulating layer comprising an insulating tape wound around the electrically conducting article, produced by the method of claim 2.
Claim 10
Independent Claim
125 words
A method for electrically insulating an electrically conducting winding which comprises winding an insulating tape containing a first resin around an electrically conducting winding, said electrically conducting winding being prepared by winding a winding conductor a predetermined number of times and inserting a layer insulator between the wound layers, and impregnating the wound insulating tape with a second resin, and curing the second resin, thereby forming an insulating layer, characterized by the first resin being a silicone resin, by the second resin being a resin having a larger force of adhesion between the windings of the tape, after curing, than said first resin, after curing, and by a ratio of the second resin b to the first resin a being 0.5:1 to 5:1 by weight.
Claim 11
Independent Claim
125 words
A method for electrically insulating an electrically conducting winding which comprises winding an insulating tape containing a first resin around an electrically conducting winding, said electrically conducting winding being prepared by winding a winding conductor a predetermined number of times and inserting a layer insulator between the wound layers, and impregnating the wound insulating tape with a second resin, and curing the second resin, thereby forming an insulating layer, characterized by the first resin being a silicone resin, by the second resin being a resin having a larger force of adhesion between the windings of the tape, after curing, than said first resin, after curing, and by a ratio of the second resin b to the first resin a being 0.5:1 to 5:1 by weight.
Claim 12
Dependent Claim
18 words
A method according to claim 9, wherein the second resin has a viscosity of less than 3 poise.
Claim 13
Dependent Claim
31 words
A method according to claim 9, wherein the second resin is a resin obtained by curing a resin composition consisting mainly of a polyfunctional isocyanate compound and a polyfunctional epoxy compound.
Claim 14
Dependent Claim
14 words
A method according to claim 9, wherein the second resin in an epoxy resin.
Claim 15
Dependent Claim
30 words
A method according to claim 9, wherein the insulating tape is a tape obtained by making integrated mica adhere to a glass cloth tape by means of the first resin.
Claim 16
Dependent Claim
30 words
A method according to claim 11, wherein the insulating tape is a tape obtained by making integrated mica adhere to a glass cloth tape by means of the first resin.
Claim 17
Dependent Claim
40 words
An electrically insulated, electrically conducting winding comprising electrically conducting winding layers and a layer insulator between the winding layers, and an insulating layer comprising an insulating tape wound around the electrically conducting winding, produced by the method of claim 9.
Claim 18
Dependent Claim
40 words
An electrically insulated, electrically conducting winding comprising electrically conducting winding layers and a layer insulator between the winding layers, and an insulating layer comprising an insulating tape wound around the electrically conducting winding, produced by the method of claim 10.
Claim 19
Independent Claim
121 words
A method for electrically insulating a field winding for a DC motor, which comprises winding an insulating tape prepared by bonding integrated mica to a glass cloth tape by means of a silicone resin as a first resin around an electric winding prepared by winding a winding conductor a predetermined number of times and inserting a layer insulator between the wound layers, impregnating the wound insulating tape with a resin obtained by curing a resin composition consisting mainly of a polyfunctional isocyanate compound and a polyfunctional epoxy compound as a second resin, and curing the second resin, thereby forming an insulating layer, a ratio b/a of the second resin b to the first resin a being 0.5:1 to 5:1 by weight.
Claim 20
Independent Claim
121 words
A method for electrically insulating a field winding for a DC motor, which comprises winding an insulating tape prepared by bonding integrated mica to a glass cloth tape by means of a silicone resin as a first resin around an electric winding prepared by winding a winding conductor a predetermined number of times and inserting a layer insulator between the wound layers, impregnating the wound insulating tape with a resin obtained by curing a resin composition consisting mainly of a polyfunctional isocyanate compound and a polyfunctional epoxy compound as a second resin, and curing the second resin, thereby forming an insulating layer, a ratio b/a of the second resin b to the first resin a being 0.5:1 to 5:1 by weight.
Claim 21
Dependent Claim
44 words
An electrically insulated field winding for a DC motor comprising an electric winding having a layer insulator inserted between layers of the electric winding, and an insulating layer comprising an insulating tape wound around the electric winding, produced by the method of claim 17.
Claim 22
Dependent Claim
26 words
A method according to claim 1, 9 or 17 wherein the insulating tape is made of a fabric consisting of mica, glass fiber or polyamide fiber.
Claim 23
Dependent Claim
20 words
A method according to claim 1, 9, or 17 wherein a protective tape is wound around the wound insulating tape.
Claim 24
Dependent Claim
20 words
A method according to claim 20, wherein said protective tape is a glass cloth tape having a high mechanical strength.
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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |