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公开(公告)号：US20200244181A1
公开(公告)日：2020-07-30
申请号：US16747760
申请日：2020-01-21
Applicant: ROLLS-ROYCE plc
Inventor： David R. TRAINER , Zhigang SUN , Ellis FH CHONG
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.
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公开(公告)号：US20180342922A1
公开(公告)日：2018-11-29
申请号：US15984552
申请日：2018-05-21
Applicant: ROLLS-ROYCE plc
Inventor： Ahmed MY RAZAK , Ellis FH CHONG
Abstract: A propulsor (101) for an aircraft is shown. The propulsor comprises a propulsive fan (106), and an electric machine (108) configured to drive the propulsive fan. The electric machine has a casing containing electrical and electromechanical components, a shaft which extends outside of the casing and which is connected to the propulsive fan, and a seal to seal the casing around the shaft. A pressurisation system pressurises the casing above an external pressure to prevent electrical breakdown within gas in the casing of the electric machine.
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公开(公告)号：US20240084710A1
公开(公告)日：2024-03-14
申请号：US18204068
申请日：2023-05-31
Applicant: ROLLS-ROYCE plc
Inventor： David R TRAINER , Ellis FH CHONG , Mark SWEET , Gian INCERPI
CPC classification number: F01D15/10 , B64D27/24 , B64D2027/026
Abstract: Reconfigurable permanent magnet electrical machines and aircraft power and propulsion systems including the electrical machines. An aircraft power and propulsion system includes: a gas turbine engine; DC electrical network; permanent magnet electrical machine including a rotor drivingly coupled to a spool of the engine, and a stator including windings controllably switchable between a star and a delta configuration; an AC-DC power electronics converter, an AC side is connected to terminals of the stator windings and a DC side is connected to the DC electrical network; an additional electrical power source connected to and controllable to supply electrical power to the DC electrical network; and a control system configured to control the switching of the stator windings between the configurations and to control the additional electrical power source to supply electrical power to the DC electrical network during a time interval when the stator is being switched between the configurations.
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公开(公告)号：US20240204594A1
公开(公告)日：2024-06-20
申请号：US18204112
申请日：2023-05-31
Applicant: ROLLS-ROYCE plc
Inventor： David R TRAINER , Ellis FH CHONG , Mark SWEET , Gian INCERPI
CPC classification number: H02K1/27 , B64D27/10 , H02K3/28 , H02K7/1823 , H02K11/33 , B64D2221/00
Abstract: Reconfigurable permanent magnet electrical machines and aircraft power and propulsion systems comprising such electrical machines are described. In one aspect, an aircraft power and propulsion system comprises: a gas turbine engine; a permanent magnet electrical machine comprising a rotor drivingly coupled to a spool of the gas turbine engine, and a stator comprising windings controllably switchable between a star configuration and a delta configuration; a DC electrical network; an AC:DC power electronics converter, an AC side of which is connected to terminals of the stator windings of the electrical machine and a DC side of which is connected to the DC electrical network; and a control system. The control system is configured to monitor at least one operating condition of the power and propulsion system and to control the switching of the stator windings between the star configuration and the delta configuration based on the at least one operating condition.
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公开(公告)号：US20220399841A1
公开(公告)日：2022-12-15
申请号：US17746189
申请日：2022-05-17
Applicant: ROLLS-ROYCE plc
Inventor： Shangjian DAI , Zhigang SUN , Ellis FH CHONG , Jiabin WANG
Abstract: A method of controlling a permanent magnet synchronous electric machine (PMSM) drive using a Deadbeat Predictive Current Control (DBPCC) scheme is provided. The method comprises: determining d-axis and q-axis stator current values (id, iq) representative of a measured PMSM current; determining d-axis and q-axis reference current values (id*, iq*); based on the stator current values (id, iq) and the reference current values (id*, iq*), determining d-axis and q-axis current correction values (Cd, Cq); determining corrected reference current values (id**, iq**) as a sum of the reference current values (id*, iq*) and the current correction values (Cd, Cq); and controlling the PMSM drive using the corrected reference current values (id**, iq**) as reference current inputs of the DBPCC scheme. A controller for performing the method; a system comprising the controller, a PMSM and associated power electronics; and a computer program for performing the method are also provided.
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Patent Agency Ranking
公开(公告)号：US20190097479A1
公开(公告)日：2019-03-28
申请号：US16059343
申请日：2018-08-09
Applicant: ROLLS-ROYCE plc
Inventor： Ellis FH CHONG , Geraint W. JEWELL
Abstract: A permanent magnet electrical machine has a rotor supporting a circumferential row of permanent magnets and a stator coaxial with the rotor and having a circumferential row of teeth carrying respective coil windings. The teeth provide paths for magnetic flux from the magnets, thereby electromagnetically linking the magnets and coils when the rotor rotates. The teeth have respective core portions on which the coil windings are mounted, and respective tip portions located between the core portions and the rotor. The tip portions are controllably rotatable between a first position where the tip portion and the core portion are angularly aligned to enhance magnetic flux linkage between the magnets and the coils, and a second position in which the tip portion is rotated out of angular alignment with its core portion to reduce magnetic flux linkage between the magnets and the coils. The tip portions are biased to the second position.
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公开(公告)号：US20200224547A1
公开(公告)日：2020-07-16
申请号：US16734531
申请日：2020-01-06
Applicant: ROLLS-ROYCE plc
Inventor： Ellis FH CHONG
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.
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公开(公告)号：US20190081532A1
公开(公告)日：2019-03-14
申请号：US16124240
申请日：2018-09-07
Applicant: ROLLS-ROYCE plc
Inventor： Ellis FH CHONG , Shanmukha RAMAKRISHNA , Vaiyapuri VISWANATHAN , Shuai WANG
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.
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公开(公告)号：US20160079899A1
公开(公告)日：2016-03-17
申请号：US14831433
申请日：2015-08-20
Applicant: ROLLS-ROYCE PLC
Inventor： Ellis FH CHONG , Andrew MACKAY
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.
Abstract translation: 用于产生交流电功率的变速发电机包括可通过旋转动作供电以产生第一交流电的交流发电机和从交流发电机整流第一交流电流的第一整流器。 发电机还包括主激励器，其具有接收经整流的第一AC电流的第一场绕组，并且具有响应于第二AC电流产生的第一电枢。 发电机还包括第二整流器，其对来自第一电枢的第二AC电流进行整流。 发电机还包括主发电机，其具有接收经整流的第二AC电流的第二场绕组，并且具有响应于输出AC电流产生的第二电枢。 第二场绕组被配置为提供多个可选择地激活的极配置，其极数不同，使得可以通过在极配置之间切换来改变输出AC电流的频率。 变速发电机还包括用于启动所选择的极配置的控制装置。
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公开(公告)号：US20180342921A1
公开(公告)日：2018-11-29
申请号：US15984544
申请日：2018-05-21
Applicant: ROLLS-ROYCE plc
Inventor： Ahmed MY RAZAK , Ellis FH CHONG
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.
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