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公开(公告)号：US20240007040A1
公开(公告)日：2024-01-04
申请号：US18333855
申请日：2023-06-13
Applicant: ROLLS-ROYCE plc
Inventor： David R. TRAINER , Ellis F. H. CHONG
Abstract: The disclosure relates to an electrical power system for connecting an electrical machine to first and second DC networks operating at different voltages. Example embodiments include an electrical power system comprising: an electrical machine having first and second pluralities of windings; a first AC:DC power electronics converter connected to the first plurality of windings; a second AC:DC power electronics converter connected to the second plurality of windings; a switching controller configured to provide switching signals to the first and second AC:DC power electronics converters to provide a first DC supply at a DC side of the first AC:DC power electronics converter and a second DC supply at a DC side of the second AC:DC power electronics converter.
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公开(公告)号：US20230373319A1
公开(公告)日：2023-11-23
申请号：US18139672
申请日：2023-04-26
Applicant: ROLLS-ROYCE plc
Inventor： David R. TRAINER , Francisco Javier CHIVITE ZABALZA , Mark SWEET , Matthew C. MORRIS
CPC classification number: B60L50/00 , H02M7/797 , H02P27/06 , H02M1/325 , B64C27/10 , B64D27/24 , B64D2027/026
Abstract: A power electronics converter comprising: first and second input terminals; first and second DC output terminals; a branch comprising first and second semiconductor switches connected in series between the first and second DC output terminals, the first input terminal connected to a node between the first and second semiconductor switches; a DC link capacitor connected between the first and second DC output terminals; and a reverse biased DC link diode connected across the DC link capacitor.
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公开(公告)号：US20230184163A1
公开(公告)日：2023-06-15
申请号：US17940748
申请日：2022-09-08
Applicant: ROLLS-ROYCE plc
Inventor： Paul R. DAVIES , Gareth E. MOORE , Stephen M. HUSBAND , David R. TRAINER , David P. SCOTHERN , Luke GEORGE
CPC classification number: F02C6/20 , F02C7/32 , F02C7/36 , F05D2220/323 , F05D2220/70
Abstract: A gas turbine engine for an aircraft comprises, in axial flow sequence, a compressor module, a combustor module, and a turbine module, with a first electric machine being rotationally connected to the turbine module. The first electrical machine is configured to generate a maximum electrical power PEM1 (W), and the gas turbine engine is configured to generate a maximum shaft power PSHAFT (W); and a ratio R of:
R
=
(
Maximum
Electrical
Power
Generated
=
P
E
M
1
)
(
Maximum
Shaft
Power
=
P
S
H
A
F
T
)
is in a range of between 0.005 and 0.020.-
公开(公告)号：US20230167786A1
公开(公告)日：2023-06-01
申请号：US17940480
申请日：2022-09-08
Applicant: ROLLS-ROYCE plc
Inventor： Paul R. DAVIES , Gareth E. MOORE , Stephen M. HUSBAND , David R. TRAINER , David P. SCOTHERN , Luke GEORGE
CPC classification number: F02K3/06 , F01D15/10 , F02C7/141 , F05D2220/36 , F05D2220/323 , F05D2260/213 , F05D2260/606
Abstract: An aircraft gas turbine engine includes a heat exchanger module, and a core engine. The core engine includes an intermediate-pressure compressor, high-pressure compressor, and high and low-pressure turbines. The high-pressure compressor rotationally connects to the high-pressure turbine by a first shaft, and the intermediate-pressure compressor rotationally connects to the low-pressure turbine by a second shaft. The heat exchanger module fluidly communicates with the core engine by an inlet duct. The heat exchanger module includes a central hub and multiple heat transfer elements extending radially from the hub and spaced in a circumferential array, for heat energy transfer from a first fluid within the elements to an inlet airflow passing over a surface of the elements prior to airflow entry into an inlet to the core engine. The gas turbine engine further includes a first electric machine rotationally connected to the first shaft, and positioned downstream of the heat exchanger module.
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公开(公告)号：US20250141336A1
公开(公告)日：2025-05-01
申请号：US18925988
申请日：2024-10-24
Applicant: Rolls-Royce plc
Inventor： David R. TRAINER , Mark SWEET
Abstract: An electrical power system includes: an H-bridge DC:DC power converter including first and second half-bridge circuits having low-side transistors and a high-side transistors, and an inductor connected between AC sides of the first and second half-bridge circuits; a DC power source connected to a first half-bridge circuit DC side; a DC electrical network connected to a second half-bridge circuit DC side; and a control system. The control system: controls the low-side and high-side transistors' switching state of the first and second half-bridge circuits; monitors one or more electrical power system operating parameters and determines whether there is a fault in the DC electrical network; and in response, modifies a switching operation of the low-side and high-side transistors of the first and second half-bridge circuits to supply a controlled amount of current from the DC power source to the DC electrical network.
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Patent Agency Ranking
公开(公告)号：US20230184171A1
公开(公告)日：2023-06-15
申请号：US17988504
申请日：2022-11-16
Applicant: ROLLS-ROYCE plc
Inventor： Gareth E. MOORE , Paul R. DAVIES , Stephen M. HUSBAND , David R. TRAINER , David P. SCOTHERN , Luke GEORGE , Douglas M M. HERBERT
IPC: F02C7/262
CPC classification number: F02C7/262 , F05D2220/323 , F05D2220/76 , F05D2260/85 , F05D2270/092 , F05D2270/093
Abstract: Multi-engine aircraft power and propulsion systems and methods of restarting an engine of a multi-engine aircraft during fight are provided. One such method comprises: determining a condition to the effect that a flame in the combustion equipment of the second gas turbine engine has been extinguished; responsive to the determination, supplying electrical power from the electrical energy storage system to one or more of the electric machines of the second gas turbine engine and operating said one or more electric machines as motors to limit a reduction in a speed of the one or more spools of the second gas turbine engine following extinguishment of the flame in its combustion equipment; and restarting the second gas turbine engine by relighting the combustion equipment of the second gas turbine engine.
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公开(公告)号：US20230184128A1
公开(公告)日：2023-06-15
申请号：US17940614
申请日：2022-09-08
Applicant: ROLLS-ROYCE plc
Inventor： Paul R. DAVIES , Gareth E. MOORE , Stephen M. HUSBAND , David R. TRAINER , David P. SCOTHERN , Luke GEORGE
CPC classification number: F01D15/10 , F02K3/06 , F05D2220/323 , F05D2260/213 , F05D2260/232 , F05D2260/42 , F05D2200/13 , F05D2200/14
Abstract: A gas turbine engine for an aircraft comprises, in axial flow sequence, a compressor module, a combustor module, and a turbine module. The gas turbine engine further comprises a first electric machine that is rotationally connected to the turbine module, and an electrical energy storage unit. The gas turbine engine is configured to generate a maximum dry thrust T (N). The first electric machine is configured to generate a maximum electrical power PEM1 (W). The electrical energy storage unit has an energy storage capacity E (Wh), a maximum charge rate C (h−1), and a maximum discharge rate D (h−1). The electrical energy storage unit is configured to store electrical energy that may be generated by the first electric machine.
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公开(公告)号：US20230159177A1
公开(公告)日：2023-05-25
申请号：US18053015
申请日：2022-11-07
Applicant: ROLLS-ROYCE plc
Inventor： David R. TRAINER , Francisco Javier CHIVITE ZABALZA , Mark SWEET , Luke GEORGE , Gian INCERPI
CPC classification number: B64D27/24 , H02M3/28 , H02J1/106 , H02J7/34 , B64D2221/00 , H02J2310/44
Abstract: The disclosure relates to an electrical power system for providing a stabilised DC voltage to a power bus. Example embodiments include an electrical power system comprising: a DC power bus having first and second DC power bus terminals; an electrical storage unit having first and second terminals, the second terminal connected to the second DC power bus terminal; a DC:DC converter having first and second DC:AC converters and a transformer connected between the first and second DC:AC converters, the first DC:AC converter connected between the first terminal of the electrical storage unit and the first DC power bus terminal; and a controller connected to control a switching operation of one or both of the first and second DC:AC converters.
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公开(公告)号：US20230136376A1
公开(公告)日：2023-05-04
申请号：US17957778
申请日：2022-09-30
Applicant: Rolls-Royce plc
Inventor： David R. TRAINER , Francisco Javier CHIVITE ZABALZA , Mark SWEET , Gian INCERPI , Luke GEORGE
Abstract: An electrical power system including: an electrical power source, a power electronics converter, an electrical network, a current limiting diode and a controllable circuit interruption device, wherein: the current limiting diode is configured to limit a fault current passing between the electrical power source and the electrical network in a fault condition; and the controllable circuit interruption device is configured to interrupt the fault current in response to a determination that the electrical power system is in the fault condition.
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公开(公告)号：US20230018916A1
公开(公告)日：2023-01-19
申请号：US17811740
申请日：2022-07-11
Applicant: ROLLS-ROYCE plc
Inventor： David R. TRAINER , Ellis F H CHONG , Jonathan M. STEVENS
Abstract: An AC to DC conversion device has first and second AC input terminals arranged to be coupled respectively to first and second terminals of a phase of an AC current generator, an H-bridge rectification device comprising two pairs of diodes, each pair being coupled to a respective one of the AC terminals to produce a DC output comprising a rectified back EMF waveform, and a waveform generator. The waveform generator comprises an output coupled to the DC output of the H-bridge rectification device, and is configured to input a unidirectional waveform to the DC output having the same magnitude and fundamental frequency as the rectified back EMF, phase shifted by a predetermined angle relative to the rectified back EMF waveform.
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