US3900274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote controlled actuation system for the rotor of a gas turbine engine
Assignee: General Electric Co
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Filing: 1974-06-25
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Granted: 1975-08-19
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Expires: 1994-06-25
Abstract
Abstract An actuation system is provided for the rotor of a gas turbine engine and includes an electric motor mounted for rotation with the engine rotor together with a generating system consisting of rotor windings which connect electrically to drive the motor, and stator windings which fixedly connect to the stationary portion of the engine. The stator windings may be energized in a controlled manner to induce an electromotive force in the rotor windings and thus provide a power and control signal to drive the electric motor at a controlled speed or direction.
Inventors
- 👤 Richard Paul Johnston
- 👤 Dave Baer Levins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:26
CPC Classifications
F; F01; F01D; F01D7/00; F05; F05D; F05D2220/00; F05D2220/30; F05D2220/36; F05D2260/00; F05D2260/70; F05D2260/74; F05D2260/76; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
In a machine having a static frame and rotor, a remote controlled actuation system for the rotor comprises: an electric actuator motor mounted for rotation with the rotor, stator winding means in fixed connection to the static frame, rotor winding means in fixed connection to the rotor for rotation therewith and in electrical connection to the motor wherein rotation of the rotor operates to induce an electromotive force in the rotor windings to drive the actuator motor when the stator windings receive an excitation current, and means for varying the level and polarity of excitation current applied to the stator winding means.
Claim 2
Dependent Claim
102 words
In a machine having a static frame and rotor, a remote controlled actuation system for the rotor comprises: an electric actuator motor mounted for rotation with the rotor, stator winding means in fixed connection to the static frame, rotor winding means in fixed connection to the rotor for rotation therewith and in electrical connection to the motor wherein rotation of the rotor operates to induce an electromotive force in the rotor windings to drive the actuator motor when the stator windings receive an excitation current, and means for varying the level and polarity of excitation current applied to the stator winding means.
Claim 3
Dependent Claim
86 words
The machine of claim 1 wherein: the machine is a gas turbine engine, the stator winding means include two axially spaced apart stator windings each having at least two poles so as to generate axially spaced magnetic fields which are 90* apart in phase, and the rotor winding means include two axially spaced apart rotor windings such that rotation of the rotor operates to induce an electromotive force in the rotor windings generating alternating currents which are phased 90* apart electrically in the respective rotor windings.
Claim 4
Dependent Claim
58 words
The gas turbine engine of claim 2 wherein the stator windings are excited by direct current and the electric motor is of the two phase alternating current type wherein variation of the level and polarity of the direct current to one of the stator windings operates respectively to vary the speed and direction of rotation of the motor.
Claim 5
Dependent Claim
139 words
In a gas turbine engine of the variable pitch fan type having a static frame and rotatable fan frame, an actuation system for the variable pitch fan comprises: an electric motor mounted for rotation with the rotatable fan frame, stator winding means in fixed connection to the static frame, rotor winding means in fixed connection to the fan frame for rotation therewith and in electrical connection to the motor wherein rotation of the rotor operates to induce an electromotive force in the rotor windings to drive the motor when the stator windings receive an excitation current, means interconnecting the motor to the fan in order that operation of the motor may be converted into variation of the pitch of the fan blades, and means for varying the level and polarity of excitation current applied to the stator winding means.
Claim 6
Dependent Claim
139 words
In a gas turbine engine of the variable pitch fan type having a static frame and rotatable fan frame, an actuation system for the variable pitch fan comprises: an electric motor mounted for rotation with the rotatable fan frame, stator winding means in fixed connection to the static frame, rotor winding means in fixed connection to the fan frame for rotation therewith and in electrical connection to the motor wherein rotation of the rotor operates to induce an electromotive force in the rotor windings to drive the motor when the stator windings receive an excitation current, means interconnecting the motor to the fan in order that operation of the motor may be converted into variation of the pitch of the fan blades, and means for varying the level and polarity of excitation current applied to the stator winding means.
Claim 7
Dependent Claim
81 words
The gas turbine engine of claim 4 wherein: the stator winding means include two axially spaced apart stator windings each having at least two poles so as to generate axially spaced magnetic fields which are 90* apart in phase, and the rotor winding means include two axially spaced apart rotor windings such that rotation of the rotor operates to induce an electromotive force in the rotor windings generating alternating currents which are phased 90* apart electrically in the respective rotor windings.
Claim 8
Dependent Claim
58 words
The gas turbine engine of claim 5 wherein the stator windings are excited by direct current and the electric motor is of the two phase alternating current type wherein variation of the level and polarity of the direct current to one of the stator windings operates respectively to vary the speed and direction of rotation of the motor.
Claim 9
Dependent Claim
124 words
The gas turbine engine of claim 4 wherein the means interconnecting the motor to the fan include a recirculating ball thread actuator, the shaft of which is drivably connected to the motor and the nut of which is threadably engaged to a unison bevel gear which simultaneously engages the teeth of a plurality of circumferentially spaced apart sector gears, each of which connects to a root portion of a respective variable pitch fan blade such that operation of the motor drives the shaft of the recirculating ball thread actuator to linearly translate the nut of the recirculating actuator which in turn imparts circumferential motion to the unison bevel gear so as to simultaneously drive the sector gears and their associated variable pitch fan blades.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |