Patent US3708875A successfully refreshed from Google Patents.
US3708875A
Expired / Lapsed
US
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Methods of constructing electrical inductive apparatus
Assignee: ABB Inc USA
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Filing: 1971-09-17
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Granted: 1973-01-09
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Expires: 1991-09-17
Abstract
Abstract Methods of constructing electrical inductive apparatus of the type having a plurality of electrical windings encapsulated in cast solid electrical insulation. At least one of the windings has a plurality of spaced electrically connected coil sections each formed of electrically conductive foil or strip, with the coil sections being fixed to metallic coil back plate members, which are supported on spaced insulating support members.
Inventors
- 👤 P Martincic
- 👤 J Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:23
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/12; H01F41/127; H01F27/00; H01F27/28; H01F27/2847; H01F27/32; H01F27/322; H01F27/327; H01F27/34; H01F27/36; H01F27/363; H01F2027/2861; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
171 words
A method of constructing an electrical winding assembly, comprising the steps of: providing first and second spaced insulating support members, attaching first and second metallic members to the first insulating support member, attaching third and fourth metallic members to the second insulating support member, winding first and second electrical coils of electrically conductive strip material about the first and third metallic members, respectively, with the first and second coils being wound in opposite circumferential directions, to provide a plurality of radially superposed turns in each, electrically connecting the ends of the innermost turns of the first and second electrical coils, winding third and fourth electrical coils of electrically conductive strip material about the second and fourth metallic members, respectively, in the circumferential directions of the first and second electrical coils, respectively, to provide a plurality of radially superposed turns in each, electrically connecting the ends of the innermost turns of the third and fourth electrical coils, and electrically connecting the ends of the outermost turns of the second and third coils.
Claim 2
Independent Claim
171 words
A method of constructing an electrical winding assembly, comprising the steps of: providing first and second spaced insulating support members, attaching first and second metallic members to the first insulating support member, attaching third and fourth metallic members to the second insulating support member, winding first and second electrical coils of electrically conductive strip material about the first and third metallic members, respectively, with the first and second coils being wound in opposite circumferential directions, to provide a plurality of radially superposed turns in each, electrically connecting the ends of the innermost turns of the first and second electrical coils, winding third and fourth electrical coils of electrically conductive strip material about the second and fourth metallic members, respectively, in the circumferential directions of the first and second electrical coils, respectively, to provide a plurality of radially superposed turns in each, electrically connecting the ends of the innermost turns of the third and fourth electrical coils, and electrically connecting the ends of the outermost turns of the second and third coils.
Claim 3
Dependent Claim
22 words
The method of claim 1 including the step of encapsulating the first, second, third and fourth electrical coils in cast solid insulation.
Claim 4
Dependent Claim
17 words
The method of claim 2 including the step of providing cooling ducts through the cast solid insulation.
Claim 5
Dependent Claim
50 words
The method of claim 3 wherein the step of providing cooling ducts in the cast solid insulation includes the steps of mounting the first and second insulating support members on first and second duct forming members, respectively, and removing the first and second duct forming members following the encapsulating step.
Claim 6
Dependent Claim
35 words
The method of claim 3 wherein the step of providing cooling ducts through the cast solid insulation includes the step of providing the first and second insulating members with openings which extend between their ends.
Claim 7
Dependent Claim
85 words
The method of claim 1 wherein the steps of electrically connecting the innermost turns of the first and second electrical coils, and the innermost turns of the third and fourth electrical coils, include the steps of folding the strip material of which the first and third coils are formed, prior to the winding steps, to provide substantially Z shaped start-start connections, with the free ends of the Z shaped start-start connections being connected to the innermost turns of the second and fourth electrical coils, respectively.
Claim 8
Dependent Claim
69 words
The method of claim 1 wherein the steps of electrically connecting the outermost turns of the second and third electrical coils includes the steps of folding the strip material of which one of the coils is formed to provide a substantially Z shaped finish-finish connection, and connecting the free end of the Z shaped finish-finish connection to the end of the outermost turn of the other of the coils.
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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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |