US3743867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage oil insulated and cooled armature windings
Assignee: Massachusetts Institute of Technology
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Filing: 1971-12-20
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Granted: 1973-07-03
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Expires: 1991-12-20
Abstract
Abstract The armature of a high-voltage electrical generator or motor is contained in a chamber which also contains transformer oil or other suitable insulating and cooling fluid. The oil immerses the armature winding and provides protection against corona and flashover. The oil is also circulated through the chamber and along, across and over the armature conductors including if desired associated structure such as a magnetic shield to provide cooling of the conductors and structure. An oil pump and oil cooler external to the chamber provide a closed oil circulating system.
Inventors
- 👤 J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:34
CPC Classifications
H; H02; H02K; H02K55/00; H02K55/02; H02K55/04; H02K3/00; H02K3/04; H02K3/24; H02K3/32; H02K3/40; H02K9/00; H02K9/19; H02K9/197; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
127 words
A high voltage electrical machine comprising an armature winding, a rotor within said armature winding, a liquid-tight chamber completely surrounding said armature winding but excluding said rotor, said chamber having a cylindrical configuration at least in that portion of said chamber interposed between the armature and the rotor, a fluid containeD within and filling said chamber and in contact with the armature winding, said fluid being electrically insulating and cooling fluid, means for circulating said fluid within said chamber, the fluid flow within said chamber flows over the external and/or internal regions of the armature bars of the winding including the end-turn region of the armature winding, means for cooling said fluid in a closed system, whereby the armature is cooled and insulated separately from the rotor.
Claim 2
Dependent Claim
127 words
A high voltage electrical machine comprising an armature winding, a rotor within said armature winding, a liquid-tight chamber completely surrounding said armature winding but excluding said rotor, said chamber having a cylindrical configuration at least in that portion of said chamber interposed between the armature and the rotor, a fluid containeD within and filling said chamber and in contact with the armature winding, said fluid being electrically insulating and cooling fluid, means for circulating said fluid within said chamber, the fluid flow within said chamber flows over the external and/or internal regions of the armature bars of the winding including the end-turn region of the armature winding, means for cooling said fluid in a closed system, whereby the armature is cooled and insulated separately from the rotor.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1 wherein said fluid is comprised of transformer oil.
Claim 4
Dependent Claim
28 words
The apparatus of claim 1 wherein the fluid in contact with the armature winding flows along, across, and over the surface of bars which comprise the armature winding.
Claim 5
Dependent Claim
34 words
The apparatus of claim 1 wherein, the armature winding is comprised of bars having a passage for the flow of fluid along and through the length of the bars which comprise the armature winding.
Claim 6
Dependent Claim
26 words
The apparatus of claim 5 wherein, said bar comprises twisted circular conductors and the passage for the flow of fluid comprises the space between the conductors.
Claim 7
Dependent Claim
33 words
The apparatus of claim 6 wherein, said circular conductors comprise twisted strands of wire having a space between the strands to provide additional passages for the flow of fluid through the armature bar.
Claim 8
Dependent Claim
65 words
The apparatus of claim 1 wherein said bar comprises, a plurality of electrical conductors, each of the same cross section, at least one tube of the same cross sectional outline, said conductors and tube being twisted around each other along their lengths to provide the conductor bar, the tube comprising the passage for the flow of fluid through and along the length of the bar.
Claim 9
Dependent Claim
65 words
The apparatus of claim 1 comprising in addition a second chamber connected to the armature chamber by at least one fluid channel, the second enclosure incorporating a flux shield to be cooled, said fluid circulating means comprising a fluid pump and a fluid cooler, each enclosure having an orifice to which the pump and cooler are serially connected to allow fluid flow through each enclosure.
Claim 10
Dependent Claim
34 words
The apparatus of claim 1 wherein said rotor comprises a cryogenically cooled winding within a cylinder containing the cryogenic fluid, and said rotor cylinder and said armature cylinder being separated by a vacuum space.
Claim 11
Dependent Claim
28 words
The apparatus of claim 4 wherein said rotor comprises a winding of superconductors and said cryogenic fluid is at a temperature at which said rotor winding is superconducting.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |