公开(公告)号：US09621090B2

公开(公告)日：2017-04-11

申请号：US14831433

申请日：2015-08-20

Applicant: ROLLS-ROYCE PLC

Inventor： Ellis F H Chong ,  Andrew Mackay

IPC: H02P9/00 ,  H02P9/38 ,  H02K19/32 ,  H02P9/48 ,  H02K7/18

CPC classification number: H02P9/48 ,  H02K7/1823 ,  H02K19/32

Abstract: A variable speed generator for producing AC electrical power includes an alternator powerable by rotational action to generate a first AC current, and a first rectifier which rectifies the first AC current from the alternator. The generator further includes a main exciter having a first field winding which receives the rectified first AC current, and having a first armature which produces in response a second AC current. The generator further includes a second rectifier which rectifies the second AC current from the first armature. The generator further includes a main generator having a second field winding which receives the rectified second AC current, and having a second armature which produces in response an output AC current. The second field winding is configured to provide a plurality of selectively activatable pole configurations which differ in the number of their poles, such that the frequency of the output AC current can be varied by switching between the pole configurations. The variable speed generator further includes a control arrangement for activating the selected pole configuration.

公开(公告)号：US12027940B2

公开(公告)日：2024-07-02

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: H02K47/04 ,  H02M3/335 ,  H02M7/219 ,  H02P6/182 ,  H02P101/30

CPC classification number: H02K47/04 ,  H02P6/182 ,  H02M3/33507 ,  H02M7/219 ,  H02P2101/30 ,  H02P2209/07

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：US11522428B2

公开(公告)日：2022-12-06

申请号：US16862845

申请日：2020-04-30

Applicant: ROLLS-ROYCE plc

Inventor： Adegoke Gbadeyan ,  Ellis F H Chong

IPC: H02K21/22 ,  H02K1/27 ,  H02K1/2786

Abstract: A radial flux rotary electric machine having an exterior-rotor configuration is shown. The machine has a permanent-magnet rotor comprising permanent magnets in a Halbach array, and an air-cored stator interior to the rotor having teeth defining tapered slots and distributed windings around the teeth to form coils in a double-layer arrangement, the windings being comprised of a plurality of phase windings. For each tooth T having a slot S1 on one side thereof and a slot S2 on another side thereof, a coil side C1 of a phase winding is arranged to occupy a radially inner layer of the slot S1 and a coil side C2 of the same phase winding is arranged to occupy a radially outer layer of the slot S2, wherein the coil side C1 has a smaller circumferential dimension and a larger radial dimension than the coil side C2.

公开(公告)号：US11387724B2

公开(公告)日：2022-07-12

申请号：US16720378

申请日：2019-12-19

Applicant: ROLLS-ROYCE plc

Inventor： Ziqiang Zhu ,  Huayang Li ,  Ellis F H Chong

IPC: H02K16/02 ,  H02K3/28 ,  B64D27/24 ,  B64C11/46 ,  B64D35/02

Abstract: The dual rotor electric machine comprises: a stator having one or more slots and one or more stator windings. The dual rotor electric machine further comprises a first rotor arranged to rotate relative to the stator with an airgap therebetween. The first rotor comprises a first rotor excitation element having one or more magnetic pole pairs arranged to interact with the stator windings, the first rotor configured to rotate about an axis (X). The dual rotor electric machine further comprises a second rotor arranged to rotate relative to the stator with an airgap therebetween. The second rotor comprises a second rotor excitation element having one or more magnetic pole pairs arranged to interact with the stator windings, the second rotor being configured to rotate about the axis (X).

公开(公告)号：US11255216B2

公开(公告)日：2022-02-22

申请号：US16734531

申请日：2020-01-06

Applicant: ROLLS-ROYCE plc

Inventor： Ellis F H Chong

IPC: H02K1/12 ,  H02K1/27 ,  H02K21/14 ,  H02K7/18 ,  F04D29/32 ,  F01D15/10 ,  B64D27/10 ,  F01D5/04 ,  H02K1/276

Abstract: An electric machine (212) comprises a turbomachine rotor (203) having a hub (302) and an axis of rotation (A-A) about which the turbomachine rotor is arranged to rotate. The turbomachine rotor includes a plurality of blades (301). Each blade has a root (303) attached to the hub, a tip (304) remote from the hub, a leading edge (305) and a trailing edge (306), a pressure side and a suction side (307). A stator (502) is located circumferentially around the turbomachine rotor. Each blade further comprises a rotor element at the tip comprising a permanent magnet having a first pole (401) and a second pole (402), the first pole being located adjacent the suction side of the blade and the second pole being located adjacent the pressure side such that a magnetic flux path extends perpendicularly through the blade tip.

公开(公告)号：US10892664B2

公开(公告)日：2021-01-12

申请号：US16124240

申请日：2018-09-07

Applicant: ROLLS-ROYCE plc

Inventor： Ellis F H Chong ,  Shanmukha Ramakrishna ,  Vaiyapuri Viswanathan ,  Shuai Wang

IPC: H02K7/04 ,  H02K7/18 ,  H02K7/09 ,  F01D15/10 ,  H02K19/10 ,  H02K11/30 ,  F01D15/00 ,  H02K1/24 ,  H02K41/03 ,  F01D5/02 ,  H02K1/14 ,  F02C7/268 ,  F02C7/32

Abstract: An electrical machine has a variable reluctance rotor, and a stator formed as an annular array of stator segments. The reluctance of the rotor-to-stator magnetic flux path varies with rotor position whereby the stator segments are magnetically energizable to rotate the rotor. The stator segments are arranged in the array such that, when energized to rotate the rotor, they produce an unbalanced force on the rotor. The machine further has a compensator including one or more balancing segments which are configured to be magnetically energizable to produce a balancing force on the rotor which balances the unbalanced force. The reluctance of the rotor-to-compensator magnetic flux path is substantially invariant with rotor position.

公开(公告)号：US10770958B2

公开(公告)日：2020-09-08

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: H02K21/04 ,  H02K23/22 ,  H02K9/10 ,  H02K1/22 ,  H02K9/16 ,  H02K1/16 ,  H02K1/27 ,  H02K3/16

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.