US4010394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Support for an end winding of a rotor of a dynamo-electric machine
Assignee: English Electric Co Ltd
•
Filing: 1974-12-12
•
Granted: 1977-03-01
•
Expires: 1994-12-12
Abstract
Abstract A rotor of a dynamo-electric machine having the conductors forming an end-winding supported by an annular support arrangement interposed between an overhang region of the rotor body and the conductors forming the end winding. The annular support arrangement may comprise a single annular member or a plurality of separate members secured around the overhang region of the rotor body. The annular support arrangement may be formed from a non-magnetic metal of low density, for example, an aluminium alloy, or may be formed from a suitable insulating material, for example, a fibre reinforced composite material.
Inventors
- 👤 Hugh Olaf Lorch
- 👤 Albert Benjamin John Reece
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:38
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/12; H02K3/00; H02K3/46; H02K3/50; H02K3/51
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
143 words
A dynamo-electric machine comprising: a. a rotor body; b. an overhang region at an end of the rotor body; c. an end-winding including a multiplicity of conductors which extend axially along the overhang region; d. annular support means interposed between the said conductors of the end winding and the overhang region; e. a plurality of annular members encircling said conductors at spaced positions along the overhang region to constrain the conductors against the effects of centrifugal force; and f. at least one expansible device interposed between the encircling annular members and the conductors forming the end-winding, the expansible device being held in an expanded condition to prestress the annular members to a tensioned condition to clamp the conductors to the support means, and to an extent such that stretching of the annular members at the maximum speed of the rotor is substantially prevented.
Claim 2
Dependent Claim
143 words
A dynamo-electric machine comprising: a. a rotor body; b. an overhang region at an end of the rotor body; c. an end-winding including a multiplicity of conductors which extend axially along the overhang region; d. annular support means interposed between the said conductors of the end winding and the overhang region; e. a plurality of annular members encircling said conductors at spaced positions along the overhang region to constrain the conductors against the effects of centrifugal force; and f. at least one expansible device interposed between the encircling annular members and the conductors forming the end-winding, the expansible device being held in an expanded condition to prestress the annular members to a tensioned condition to clamp the conductors to the support means, and to an extent such that stretching of the annular members at the maximum speed of the rotor is substantially prevented.
Claim 3
Dependent Claim
26 words
A rotor as claimed in claim 1, wherein said expansible device comprises an inflatable container containing a medium which maintains the container in the inflated condition.
Claim 4
Dependent Claim
20 words
A rotor as claimed in claim 2, wherein the medium within the inflatable container is a solidified curable synthetic resin.
Claim 5
Dependent Claim
21 words
A rotor as claimed in claim 1, wherein the encircling annular members are formed from strong fibers embedded in synthetic resin.
Claim 6
Dependent Claim
26 words
A rotor as claimed in claim 1, wherein the annular support means comprises a single annular member secured around the overhang region of the rotor body.
Claim 7
Dependent Claim
27 words
A rotor as claimed in claim 1, wherein the annular support means comprises a plurality of separate members secured around the overhang region of the rotor body.
Claim 8
Dependent Claim
21 words
A rotor as claimed in claim 1, wherein the annular support means is formed from a non-magnetic metal of low density.
Claim 9
Dependent Claim
18 words
A rotor as claimed in claim 1, wherein the annular support means is formed from an aluminum alloy.
Claim 10
Dependent Claim
18 words
A rotor as claimed in claim 1, wherein the annular support means is formed from electrical insulating material.
Claim 11
Dependent Claim
19 words
A rotor as claimed in claim 1, wherein the annular support means is formed from a fiber-reinforced composite material.
Claim 12
Dependent Claim
62 words
A rotor as claimed in claim 1, wherein the axially extending portions of the conductors forming the end-winding are constrained against torque forces by a plurality of support members disposed axially along the annular support means and projecting from the periphery of the annular support means so that groups of axially extending conductors of the end-winding lie between two adjacent support members.
Claim 13
Dependent Claim
28 words
A rotor as claimed in claim 1, wherein the rotor is gas-cooled and the annular support means is provided with ducts through which the cooling gas is conveyed.
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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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |