公开(公告)号：US20170141648A1

公开(公告)日：2017-05-18

申请号：US15298941

申请日：2016-10-20

Applicant: ROLLS-ROYCE PLC

Inventor： Ellis F H CHONG ,  Brian E. SIMMERS

IPC: H02K7/116 ,  H02K1/27 ,  F02C7/36 ,  H02K7/08 ,  F02C6/20 ,  H02K41/02 ,  H02K7/18

CPC classification number: H02K7/116 ,  F02C6/203 ,  F02C7/36 ,  H02K1/2706 ,  H02K1/2786 ,  H02K1/2793 ,  H02K7/08 ,  H02K7/1823 ,  H02K16/02 ,  H02K19/06 ,  H02K19/103 ,  H02K41/02

Abstract: An electrical machine including a moveable permanent magnet configured to generate a first magnetic field. A stator including windings configured to excite a second magnetic field. A moveable inter-pole component located between the permanent magnet component and the stator, the inter-pole component comprising an array of magnetic inter-pole pieces. The speed of movement of the inter-pole component is controlled to set a magnetic gear ratio between the first and second magnetic fields. Also a gas turbine engine, propulsor or thruster incorporating the electrical machine.

公开(公告)号：US20230278721A1

公开(公告)日：2023-09-07

申请号：US18165061

申请日：2023-02-06

Applicant: ROLLS-ROYCE plc

Inventor： David R TRAINER ,  Francisco Javier CHIVITE ZABALZA ,  Ellis F H CHONG

IPC: B64D35/00 ,  B64D27/24 ,  B64C29/00 ,  B60L50/60 ,  H02P5/74

CPC classification number: B64D35/00 ,  B60L50/60 ,  B64C29/0008 ,  B64D27/24 ,  H02P5/74 ,  B60L2200/10 ,  B60L2210/40 ,  B64D2221/00

Abstract: The disclosure relates to an electric aircraft propulsion assembly for an electric vertical takeoff and landing, eVTOL, aircraft, the 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 for driving the first electric motor and a second electric motor connected to power a second propulsor, a second converter. A controller is connected to control operation of the first and second converters and is configured to operate in a first mode in which the first and second converters are operated as DC:AC converters to drive the first and second electric motors and a second mode in which the first converter is operated to drive the first electric motor to power the first propulsor and the second converter is operated to drive the second electric motor to provide a braking torque on the second propulsor.

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

IPC: H02M7/219 ,  H02P6/182 ,  H02M3/335

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.

公开(公告)号：US20180131250A1

公开(公告)日：2018-05-10

申请号：US15795492

申请日：2017-10-27

Applicant: ROLLS-ROYCE plc

Inventor： Geraint W. JEWELL ,  Adam J. MCLOUGHLIN ,  Ellis F H CHONG

IPC: H02K7/108 ,  H02K1/27 ,  F16D27/01 ,  F16D27/108 ,  F16D27/118 ,  F16D11/14

CPC classification number: H02K7/1085 ,  F02C7/36 ,  F05D2260/403 ,  F16D11/14 ,  F16D27/01 ,  F16D27/108 ,  F16D27/118 ,  H02K1/272 ,  H02K7/125 ,  H02K7/1823 ,  Y02E10/725

Abstract: An electrical machine comprising a two-part rotor formed of a first rotor part and a second rotor part. The first rotor part includes a conical section and is mounted to a shaft of the machine. The second rotor part has a bore including a complementary conical section. The second rotor part is configured to displace axially between a first state, in which it is engaged with the first rotor part to form the rotor of the electrical machine, and a second state, in which it is axially disengaged from the first rotor part. Also a clutch having an engaged state and a disengaged state. When the clutch is in one of its states the second rotor part is in its first state and switching the clutch to the other of its states axially displaces the second rotor part to its second state.

公开(公告)号：US20200227966A1

公开(公告)日：2020-07-16

申请号：US16720463

申请日：2019-12-19

Applicant: ROLLS-ROYCE plc

Inventor： Giles E. HARVEY ,  Paul A. SMEETON ,  Ellis F H CHONG

IPC: H02K3/28 ,  B64D27/24 ,  B64C11/46 ,  B64D35/02

Abstract: A vehicle propulsion system comprises a first propulsor and a second propulsor. The first and second propulsors are coupled to an electric machine comprising a stator and first and second rotors. Each of the first and second rotors are electromagnetically coupled to the stator. The first rotor is coupled to the first propulsor and the second rotor is coupled to the second propulsor.

公开(公告)号：US20190173335A1

公开(公告)日：2019-06-06

申请号：US16194932

申请日：2018-11-19

Applicant: ROLLS-ROYCE plc

Inventor： Shanmukha RAMAKRISHNA ,  Ellis F H CHONG

IPC: H02K1/24 ,  H02K1/14 ,  H02K7/18 ,  F01D15/10

Abstract: A switched reluctance machine is provided, the machine includes a stator having a circumferential row of magnetically energizable teeth carrying coil windings. The machine further includes a coaxial variable reluctance rotor having a circumferential row of magnetisable poles, the reluctance of the rotor-to-stator magnetic flux path varying with rotor position. Each pole has first and second side flanks and a tip surface, one of the side flanks forming a leading edge surface of the pole, the other side flank forming an opposite, trailing edge surface of the pole, and the tip surface arcing from the leading edge surface to the trailing edge surface and facing the stator to form an air gap to the teeth of the stator. Also each pole contains one or more cavities.

公开(公告)号：US20190157956A1

公开(公告)日：2019-05-23

申请号：US16169117

申请日：2018-10-24

Applicant: ROLLS-ROYCE plc

Inventor： Ellis F H CHONG ,  Shanmukha RAMAKRISHNA ,  King Jet TSENG ,  Kin Hey CHU

IPC: H02K23/22 ,  H02K3/16 ,  H02K1/27 ,  H02K1/16

Abstract: A synchronous electrical machine includes a stator having a circumferential row of teeth carrying stator windings. The electrical machine further includes a coaxial rotor having a circumferential row of poles carrying field windings. Each pole has first and second side flanks and a tip surface which extends continuously there between to form an air gap to the teeth of the stator. On a transverse cross-section through the machine, one of the side flanks forms a leading edge of the pole, and the other side flank forms an opposite, trailing edge of the pole. Each pole carries a row of permanent magnets which extends across the tip surface from one of the side flanks to the other side flank, the permanent magnets compensating for armature magnetic reaction. The radial thickness of the permanent magnets increases smoothly with progressive distance across the tip surface from one of the side flanks to the other side flank.

公开(公告)号：US20250141313A1

公开(公告)日：2025-05-01

申请号：US18906737

申请日：2024-10-04

Applicant: ROLLS-ROYCE plc

Inventor： Hao CHEN ,  Ellis F H CHONG ,  Carl BOETTCHER

IPC: H02K11/20 ,  H02K1/14

Abstract: The disclosure relates to electrical machine condition monitoring by placement of a Fibre Bragg Grating (FBG) in the stator of an electrical machine. Example embodiments include an electrical machine comprising: a stator having a plurality of stator teeth having windings around each tooth; a rotor rotatably mounted within the stator; and an optical fibre mounted to the stator, wherein the optical fibre comprises a Fibre Bragg Grating, FBG, positioned between an adjacent pair of stator teeth and oriented to measure a tangential strain between the pair of stator teeth.

公开(公告)号：US20230150683A1

公开(公告)日：2023-05-18

申请号：US18051113

申请日：2022-10-31

Applicant: ROLLS-ROYCE plc

Inventor： Ellis F H CHONG

IPC: B64D33/08 ,  B64D27/24 ,  H02K9/19 ,  H02K1/20

CPC classification number: B64D33/08 ,  B64D27/24 ,  H02K9/19 ,  H02K1/20

Abstract: An electric machine comprises a stator winding located within a stator housing. The stator housing comprises an inlet chamber configured to communicate with a supply of coolant, and an outlet. The stator housing contains a baffle configured to separate the stator winding and outlet from the inlet chamber. The baffle includes at least one aperture therethrough configured to supply an impingement flow of coolant to the stator winding.

公开(公告)号：US20200227956A1

公开(公告)日：2020-07-16

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.