公开(公告)号：US10408879B2

公开(公告)日：2019-09-10

申请号：US15705716

申请日：2017-09-15

Applicant: ROLLS-ROYCE plc

Inventor： Sivakumar Nadarajan ,  Amit K. Gupta ,  Vaiyapuri Viswanathan

IPC: G01R31/34 ,  G01H1/00 ,  G01M1/16 ,  G01H3/04 ,  G01H3/08

Abstract: A method for diagnosing a fault condition in an electric machine includes measuring at least one physical parameter generated during operation of the electric machine; analyzing the or each measured parameter in a frequency domain; and determining whether the electric machine has a stator or rotor winding fault based on a comparison of an amplitude of the or each analyzed parameter at a first predetermined frequency and a first threshold amplitude for the first frequency. The at least one physical parameter includes a sound generated by the electric machine.

公开(公告)号：US10725107B2

公开(公告)日：2020-07-28

申请号：US15702182

申请日：2017-09-12

Applicant: ROLLS-ROYCE plc

Inventor： Sivakumar Nadarajan ,  Amit Gupta ,  Vaiyapuri Viswanathan ,  Chandana Gajanayake

IPC: G01R31/34 ,  G06F16/28 ,  H02P29/024 ,  H02P9/10 ,  H02P101/25 ,  H02P103/20 ,  F02C3/04

Abstract: A method of classifying a stator winding fault in a brushless synchronous generator includes measuring an electrical parameter of the stator winding and classifying the fault by calculating positive or negative sequence harmonics of the parameter and comparing one or more harmonic component to a threshold.

公开(公告)号：US09459320B2

公开(公告)日：2016-10-04

申请号：US14573573

申请日：2014-12-17

Applicant: ROLLS-ROYCE PLC

Inventor： Vaiyapuri Viswanathan ,  Chandana Gajanayake ,  Amit Gupta ,  Sivakumar Nadarajan

IPC: H02P11/00 ,  G01R31/34 ,  H02H7/06 ,  H02P9/10 ,  H02P9/00

CPC classification number: G01R31/343 ,  H02H7/065 ,  H02P9/00 ,  H02P9/102 ,  H02P11/00

Abstract: A method for detecting a fault in an exciter circuit, suitable for use in a brushless generator, the exciter circuit including (a) an exciter armature winding, having a plurality of armatures, arranged to generate a multiphase AC signal, each armature of the plurality of armatures providing a respective sub-signal component of the multiphase AC signal, and (b) a rectifier circuit for receiving the sub-signals via the respective armatures, the rectifier circuit comprising a plurality of components arranged to rectify the sub-signals to provide a rectified output signal, wherein the method includes the steps of: acquiring a respective operational sub-value for a first characteristic of each of at least two of the respective sub-signals; deriving an operational value indicative of a relationship between the acquired respective operational sub-values; determining whether a fault has occurred in the exciter circuit on the basis of the derived operational value.

Abstract translation: 一种用于检测适用于无刷发电机的励磁电路中的故障的方法，所述励磁电路包括（a）具有多个电枢的励磁机电枢绕组，所述多个电枢布置成产生多相交流信号，所述多个电枢 提供多相AC信号的相应子信号分量的电枢，以及（b）用于经由相应电枢接收子信号的整流电路，整流电路包括多个组件，其被布置成整流子信号以提供 整流输出信号，其中所述方法包括以下步骤：获取相应子信号中的至少两个中的每一个的第一特性的相应运算子值; 导出指示所获取的各个操作子值之间的关系的操作值; 基于导出的操作值来确定励磁电路中是否发生故障。

公开(公告)号：US09910083B2

公开(公告)日：2018-03-06

申请号：US14573759

申请日：2014-12-17

Applicant: ROLLS-ROYCE PLC

Inventor： Vaiyapuri Viswanathan ,  Amit Kumar Gupta ,  Chandana Jayampathi Gajanayake ,  Sivakumar Nadarajan

IPC: G01R31/26 ,  G01R23/02 ,  G01R31/34 ,  G01R31/40 ,  H02H7/125 ,  H02K11/20

CPC classification number: G01R31/2632 ,  G01R23/02 ,  G01R31/343 ,  G01R31/40 ,  H02H7/1255 ,  H02K11/20

Abstract: A method of detecting a diode fault in an AC signal rectifier circuit, the AC signal rectifier circuit including a plurality of diodes, and being arranged to supply a rectified output voltage to a load, wherein the method includes the steps of deriving an operating value indicative of the ratio of the voltage magnitudes of a first harmonic frequency and another harmonic frequency of the rectified output voltage across the load; and determining whether a fault has occurred in one or more diodes on the basis of the derived operating value. The first harmonic frequency is preferably the fundamental harmonic frequency, and/or the another harmonic frequency is preferably the 6th harmonic frequency.

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：US10082531B2

公开(公告)日：2018-09-25

申请号：US15347499

申请日：2016-11-09

Applicant: ROLLS-ROYCE plc

Inventor： Vaiyapuri Viswanathan ,  Sivakumar Nadarajan ,  Amit K. Gupta

IPC: G01R31/02 ,  H02P9/14 ,  G01R31/34 ,  H02P29/024

CPC classification number: G01R31/02 ,  G01R31/34 ,  H02P9/14 ,  H02P25/03 ,  H02P29/0241

Abstract: A rectifier diode failure detection apparatus for an electrical machine (10), the electrical machine (10) comprising an exciter armature winding (28a-c), a rotor main field winding (24) and first and second rectifiers (34a, 34b) arranged in parallel, each rectifier (34a, 34b) comprising at least first and second diodes (38a, 38b), each rectifier being configured to independently supply the rotor main field winding (24) with DC electrical current, the failure detection apparatus comprising:a controller (40) comprising at least two current sensors (42a, 42b), each current sensor (42a, 42b) being configured to measure output current (If1, If2) of a respective one of the rectifiers (34a, 34b), and the controller (40) being configured to determine a harmonic of the measured rectifier output currents; the controller (40) being further configured to determine a ratio of the magnitude of the first rectifier (34a) output current harmonic to the magnitude of the second rectifier (34b) output current harmonic, wherein the controller (40) is configured to determine that a fault has occurred in one of the rectifier diodes (38a, 38b) where the ratio exceeds a threshold value.