Patent US4363986A successfully refreshed from Google Patents.
US4363986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor of an electrical machine
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1980-07-24
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Granted: 1982-12-14
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Expires: 2000-07-24
Abstract
Abstract A rotor of a turbine generator, wherein the field and amortisseur windings are held in place by means of axially and tangentially secured rings shrunk on the rotor body without the use of otherwise customary slot wedges. The rings are shrunk on the rotor body without overlapping and at a distance from each other. In this way, the magnetically effective rotor cross-section is increased up to 30% without reducing the size of the air gap.
Inventors
- 👤 Reinhard Joho
- 👤 Herbert Pohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:26
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/04; H02K3/00; H02K3/46; H02K3/48; H02K3/487
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
132 words
A rotor of an electrical machine, especially a turbine generator, wherein at least one rotor winding is placed into grooves formed in a rotor body and secured against forces developing during operation by means of rings of nonmagnetic material, said rotor having pole zones, comprising: said rings being secured without overlapping and at a distance from each other on the rotor body with said rings axially and tangentially secured in the pole zones; said rings having nose-like diametrically opposite projections provided on an inner surface thereof in the pole zone area in at least one ring end zone; and said rotor having corresponding recesses open at least towards one groove in the pole zones whereby one or multi-part breach components slide into at least one of the grooves adjacent to the recesses.
Claim 2
Dependent Claim
132 words
A rotor of an electrical machine, especially a turbine generator, wherein at least one rotor winding is placed into grooves formed in a rotor body and secured against forces developing during operation by means of rings of nonmagnetic material, said rotor having pole zones, comprising: said rings being secured without overlapping and at a distance from each other on the rotor body with said rings axially and tangentially secured in the pole zones; said rings having nose-like diametrically opposite projections provided on an inner surface thereof in the pole zone area in at least one ring end zone; and said rotor having corresponding recesses open at least towards one groove in the pole zones whereby one or multi-part breach components slide into at least one of the grooves adjacent to the recesses.
Claim 3
Dependent Claim
25 words
A rotor according to claim 1, further comprising: said rings having an axial length (l) smaller than half the outer diameter (d) of the rotor.
Claim 4
Dependent Claim
38 words
A rotor according to claim 1, further comprising: said rings having an axial length (l) wherein the ratio of the axial length (l) of the rings to the pole pitch (τp) is between the values 0.05 and 0.25.
Claim 5
Dependent Claim
17 words
A rotor according to claim 1, further comprising: the breech components being part of an amortisseur winding.
Claim 6
Dependent Claim
40 words
A rotor according to any one of claims 1, 2, 3, or 4, further comprising: transverse slots provided in the rotor body and running in the pole zones orthogonally to the rotor axis and extending across the entire pole zone.
Claim 7
Dependent Claim
38 words
A rotor according to claim 5, further comprising: the transverse slots approximately aligned with the gaps between two successive rings; and the depth of the slots corresponding approximately to the depth of the grooves of a field winding.
Claim 8
Dependent Claim
27 words
A rotor according to claim 1, further comprising: said rings being provided with at least one balancing groove which is preferably centrally arranged and closed in itself.
Claim 9
Dependent Claim
30 words
A rotor according to claim 7, further comprising: said at least one balancing groove having a depth less than or equal to 2/3 of the ring thickness (d 10 ).
Claim 10
Dependent Claim
18 words
A rotor according to claims 7 or 8, further comprising: two-part damper weights placed into the balancing groove.
Claim 11
Dependent Claim
15 words
A rotor according to claim 9, wherein said damper weights are insulated from each other.
Claim 12
Dependent Claim
42 words
A rotor according to one of claims 1, 2, 3, or 4, wherein, in the case of a two-pole rotor, plural windings are arranged in a field winding groove next to each other and in two layers on top of each other.
Claim 13
Dependent Claim
38 words
A rotor according to claims 1, 2, 3, or 4, wherein, in case of a four-pole rotor, plural windings are arranged in a field winding groove next to each other in three layers on top of each other.
References Cited (Backward Citations)
US3330977A
Cited
US3560776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |