公开(公告)号：US20230278718A1

公开(公告)日：2023-09-07

申请号：US18165028

申请日：2023-02-06

Applicant: ROLLS-ROYCE plc

Inventor： David R. Trainer ,  Francisco Javier Chivite Zabalza ,  Ellis F H Chong

IPC: B64D31/00 ,  H02M7/217 ,  B64D27/24 ,  B64C29/00 ,  B60L15/02

CPC classification number: B64D31/00 ,  H02M7/217 ,  B64D27/24 ,  B64C29/0033 ,  B60L15/02 ,  B60L2210/40

Abstract: The disclosure relates to an electric aircraft propulsion assembly comprising: an electric storage unit; a first electric motor connected to power a first propulsor; a first converter configured as a DC:AC converter having input connections connectable to the electric storage unit and output connections connected across the first electric motor, the first converter configured as a DC:AC converter; a second electric motor connected to power a second propulsor; a second converter connected between the first converter input connections and the second electric motor; and a controller configured to control operation of the first and second converters, wherein the second converter is operable as a DC:AC converter to convert the DC supply from the electric storage unit to an AC supply across the second electric motor and as a DC:DC converter to convert the DC supply from the electric storage unit at a first DC level to a DC supply at the input connections of the first converter at a second DC level.

公开(公告)号：US11303181B2

公开(公告)日：2022-04-12

申请号：US15984544

申请日：2018-05-21

Applicant: ROLLS-ROYCE plc

Inventor： Ahmed My Razak ,  Ellis F H Chong

IPC: H02K5/124 ,  H02K5/12 ,  B64D13/02 ,  B64D27/10 ,  B64D27/24 ,  B64D27/02 ,  F01D15/08 ,  B64D13/06 ,  F02C3/04

Abstract: An electric machine (101) for use in an aircraft is shown. The electric machine comprises a casing (104) containing electromechanical components, a shaft (106) which extends outside of the casing, a seal (107) to seal the casing around the shaft, and a pressurisation system (102) configured to pressurise the casing above an external pressure to prevent electrical breakdown within gas in the casing.

公开(公告)号：US11121639B2

公开(公告)日：2021-09-14

申请号：US16747760

申请日：2020-01-21

Applicant: ROLLS-ROYCE plc

Inventor： David R Trainer ,  Zhigang Sun ,  Ellis F H Chong

IPC: H02M7/219 ,  F02C6/00 ,  H02P9/30 ,  H02M1/14

Abstract: Disclosed herein is a converter for converting an AC voltage to a DC voltage, the converter comprising: a first H-bridge circuit comprising a first AC terminal for receiving an AC voltage, a second AC terminal, a first DC terminal and a second DC terminal; a second H-bridge circuit comprising a first AC terminal for receiving an AC voltage, a second AC terminal, a first DC terminal and a second DC terminal; an isolation block arranged between the second AC terminal of the first H-bridge circuit and the second AC terminal of the second H-bridge circuit; and a DC voltage output of the converter with a first terminal and a second terminal; wherein: the first terminal of the DC voltage output is connected to the first DC terminal of the first H-bridge circuit and the first DC terminal of the second H-bridge circuit; and the second terminal of the DC voltage output is connected to the second DC terminal of the first H-bridge circuit and the second DC terminal of the second H-bridge circuit.

公开(公告)号：US11063527B2

公开(公告)日：2021-07-13

申请号：US16570739

申请日：2019-09-13

Applicant: ROLLS-ROYCE plc

Inventor： David R. Trainer ,  Ellis F H Chong ,  Zhigang Sun

IPC: H02M7/217 ,  H02M7/23 ,  H02M7/25

Abstract: An electrical converter (203) having an active diode-clamped multilevel topology is shown. Each clamping diode is connected in antiparallel with a switch (S5A, S5B). The converter comprises polyphase supply phases (A, B, C) each of which are connected via a respective phase leg (401, 402, 403) to dc rails (301, 302) and a dc-link capacitor. The dc-link capacitor includes a plurality of series-connected capacitors (404, 405). A controller is configured to, in response to an event signal, for each phase leg, activate a combination of switches therein to form a pair of parallel conduction paths to a midpoint (406) between two capacitors in the dc-link capacitor, thereby connecting each phase to the same node.

公开(公告)号：US09998062B2

公开(公告)日：2018-06-12

申请号：US15443991

申请日：2017-02-27

Applicant: ROLLS-ROYCE plc

Inventor： Sivakumar Nadarajan ,  Ellis F H Chong

IPC: H02H7/08 ,  H02P29/024 ,  H02K1/27 ,  H02K21/24

CPC classification number: H02P29/027 ,  H02K1/2793 ,  H02K1/28 ,  H02K7/10 ,  H02K21/026 ,  H02K21/028 ,  H02K21/029 ,  H02K21/24 ,  H02K2213/06 ,  H02K2213/09

Abstract: An axial flux permanent magnet machine including a pair of axially spaced first components. A second component positioned axially between and equidistant from the first components. Either the pair of first components or the second component is arranged to rotate about a shaft. A translation mechanism coupled to each of the first components. The translation mechanism configured to translate the first components axially away from the second component. Also a method of controlling an axial flux permanent magnet machine.

公开(公告)号：US11171524B2

公开(公告)日：2021-11-09

申请号：US16733263

申请日：2020-01-03

Applicant: ROLLS-ROYCE plc

Inventor： Ellis F H Chong ,  Alexander C. Smith ,  Yuanpeng Zhou

IPC: H02K1/14 ,  H02K1/24 ,  H02K19/24

Abstract: An electromechanical system comprising: a rotor comprising a plurality of teeth spaced about a circumference of the rotor, wherein the teeth of the rotor are equally spaced about the rotor according to a tooth spacing angle, and are skewed in an axial direction such that the circumferential positions of the teeth of the rotor vary along the axial length of the rotor, and first and second stator segments, each extending partway about the rotor and comprising a field winding and poles arranged to magnetically interact with the teeth of the rotor such that an alternating current (AC) back-emf is induced in the field winding upon rotation of the rotor. The poles of the first stator segment are angularly displaced about the rotor from the poles of the second stator segment such that the back-emf induced in the field winding of the first stator segment is phase shifted with respect to the back-emf induced in the field winding of the second stator segment.

公开(公告)号：US10122228B2

公开(公告)日：2018-11-06

申请号：US15047094

申请日：2016-02-18

Applicant: ROLLS-ROYCE plc

Inventor： Ellis F H Chong ,  Martyn A. Jones ,  Geraint W. Jewell

IPC: H02K1/27 ,  H02K15/14 ,  H02K1/28

Abstract: A sleeve for retaining magnets around a rotor of an electrical machine. The sleeve is cylindrical and hollow, having axial length and having radial thickness between its inner surface and outer surface. The sleeve defines a plurality of axially spaced, circumferentially extending grooves. Each groove has radial depth which is less than the radial thickness of the sleeve.

公开(公告)号：US10084355B2

公开(公告)日：2018-09-25

申请号：US15190717

申请日：2016-06-23

Applicant: ROLLS-ROYCE PLC

Inventor： Geraint W Jewell ,  Ellis F H Chong ,  Maurice Shortte

IPC: H02K9/19 ,  H02K5/20 ,  H02K3/24 ,  H02K9/197

CPC classification number: H02K3/24 ,  H02K5/20 ,  H02K9/197

Abstract: An electrical machine is disclosed comprising a stator cavity. The stator cavity is axially divided by a distribution plate into a winding chamber containing stator windings of the electrical machine and a handling chamber. The handling chamber has one of a fluid inlet and a fluid outlet and the winding chamber has the other of the fluid inlet and fluid outlet. In use fluid is passed from the fluid inlet to the fluid outlet via the handling chamber, the winding chamber and an array of fluid passages in the distribution plate providing fluid communication between the handling chamber and winding chamber. The array of fluid passages comprises passages of at least two different cross-sectional areas.

公开(公告)号：US11930709B2

公开(公告)日：2024-03-12

申请号：US17572952

申请日：2022-01-11

Applicant: ROLLS-ROYCE plc

Inventor： Ellis F H Chong

IPC: H10N15/20 ,  B64D27/10 ,  B64D27/24 ,  B64D41/00 ,  F02C6/00 ,  H02K5/20 ,  H02K9/19 ,  H02K9/22 ,  H02K11/33 ,  H02K21/14 ,  H02K99/00 ,  H02N11/00 ,  B64D27/02

CPC classification number: H10N15/20 ,  B64D27/10 ,  B64D27/24 ,  B64D41/00 ,  F02C6/00 ,  H02K5/203 ,  H02K9/19 ,  H02K9/227 ,  H02K11/33 ,  H02K21/14 ,  B64D2027/026 ,  B64D2041/002 ,  F05D2220/323

Abstract: Integrated arrangements of electrical machines and power electronics converters are described. One such arrangement comprises: an electrical machine comprising one or more windings; a power electronics converter arranged to supply current to or receive current from the one or more windings of the electrical machine; a magnetocaloric effect (MCE) material in thermal contact with the power electronics converter; and a heat sink for removing heat from the MCE material. The MCE material is arranged in proximity to the one or more windings of the electrical machine whereby, in use, stray magnetic flux from the windings of the electrical machine passes through the MCE material and activates the MCE material. The repeated application and removal of the stray flux during normal operation of the electrical machine creates cycles of magnetic refrigeration, which removes heat from the power electronics converter.

公开(公告)号：US10680503B2

公开(公告)日：2020-06-09

申请号：US15204443

申请日：2016-07-07

Applicant: ROLLS-ROYCE plc

Inventor： Stephen Williamson ,  Alexander C Smith ,  John J A Cullen ,  Ellis F H Chong

IPC: H02K55/00 ,  H02K11/01 ,  H02K55/02 ,  H02K55/04 ,  H02K3/28

Abstract: An electrical machine including a rotor and a stator, at least one of the rotor and stator being provided with superconducting first electrical windings; and a set of one or more screen electrical windings, provided in the form of one or more further superconducting electrical windings, arranged around and radially outward of the first electrical windings; wherein the set of screen electrical windings is arranged to be supplied with an electrical current for generating a magnetic field of suitable magnitude and phase to reduce the magnitude of the magnetic field, generated at least by the first electrical windings during operation of the electrical machine, radially outwards of the screen electrical windings.