US3591844A
Expired / Lapsed
US
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Electrical apparatus for rotating a turbogenerator shaft
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1967-09-26
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Granted: 1971-07-06
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Expires: 1987-09-26
Abstract
Abstract Electrical apparatus for rotating a turbogenerator or gas turbine shaft after it stops or before it starts. The apparatus comprises the generator of a turbogenerator plant used as an electric AC motor with lower frequency and electrically connected to an AC converter from normal to lower frequency. The speed of the motor (generator) may be varied, as desired, by controlling the power and frequency of the electricity supplied by the converter.
Inventors
- 👤 Gerhard Schonebeck
- 👤 Jurgen Koehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:30
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
195 words
In an electrical apparatus for rotating turbine apparatus which includes a turbine having at least one casing, a dynamoelectric machine having a rotor and a polyphase stator, a shaft connecting said turbine with said dynamoelectric machine and sensing means in said at least one turbine casing for sensing a plurality of operating parameters selected from the group comprising temperature, pressure, expansion, vibration and shaft speed to control the operation of said turbine as a function thereof, the improvement comprising a plurality of rectifier elements, said rectifier elements connected to said sensing means, to a polyphase electric power source and selectively connected to said rotor and said stator so that the dynamoelectric machine may be selectively operated as a generator and as a motor, said plurality of rectifier elements being responsive to said sensing means for varying the electrical current, voltage and frequency of the output current of said rectifier elements, whereby the turbine apparatus may both be started from standstill and brought up to a certain limiting speed by steps at any given time as a function of said at least one operating parameter and be slowed down from the certain limiting speed to standstill.
Claim 2
Dependent Claim
195 words
In an electrical apparatus for rotating turbine apparatus which includes a turbine having at least one casing, a dynamoelectric machine having a rotor and a polyphase stator, a shaft connecting said turbine with said dynamoelectric machine and sensing means in said at least one turbine casing for sensing a plurality of operating parameters selected from the group comprising temperature, pressure, expansion, vibration and shaft speed to control the operation of said turbine as a function thereof, the improvement comprising a plurality of rectifier elements, said rectifier elements connected to said sensing means, to a polyphase electric power source and selectively connected to said rotor and said stator so that the dynamoelectric machine may be selectively operated as a generator and as a motor, said plurality of rectifier elements being responsive to said sensing means for varying the electrical current, voltage and frequency of the output current of said rectifier elements, whereby the turbine apparatus may both be started from standstill and brought up to a certain limiting speed by steps at any given time as a function of said at least one operating parameter and be slowed down from the certain limiting speed to standstill.
Claim 3
Dependent Claim
25 words
Electrical rotating apparatus as defined in claim 1 wherein said plurality of rectifier elements are thyristor elements which control the electrical current, voltage and frequency.
Claim 4
Dependent Claim
28 words
Electrical rotating apparatus as defined in claim 2 wherein said shaft comprises shaft sections, a shaft coupling connecting said sections together, said shaft coupling forming a motor rotor.
Claim 5
Dependent Claim
19 words
An electrical apparatus as defined in claim 3 further including a polyphase stator in cooperation with said motor rotor.
Claim 6
Dependent Claim
60 words
Electrical rotating apparatus as defined in claim 4 wherein said turbine apparatus is a turbogenerator having a turbine and a generator mechanically connected together, said generator being constituted by said rotor and said stator, said rotor having an inductor winding, there being means for short-circuiting said inductor winding thereby to allow said generator to be operated as an asynchronous motor.
Claim 7
Dependent Claim
60 words
Electrical rotating apparatus as defined in claim 4 wherein said turbine apparatus is a turbogenerator having a turbine and a generator mechanically connected together, said generator being constituted by said rotor and said stator, said rotor having an inductor winding, there being means for exciting said inductor winding thereby to allow said generator to be operated as a synchronous motor.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |