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    ASSESSMENT METHOD
    1.
    发明申请
    ASSESSMENT METHOD 审中-公开
    评估方法

    公开(公告)号：US20160154065A1

    公开(公告)日：2016-06-02

    申请号：US14926853

    申请日：2015-10-29

    Applicant: ROLLS-ROYCE PLC

    Inventor： Sivakumar NADARAJAN ,  Shantha Dharmasiri Gamini JAYASINGHE ,  Amit Kumar GUPTA ,  Chandana Jayampathi GAJANAYAKE ,  Viswanathan VAIYAPURI

    IPC: G01R31/40

    CPC classification number: G01R31/40 ,  G01R29/16 ,  G01R31/343

    Abstract: A method of assessing a condition of a multi-phase power system comprises the steps of: acquiring a voltage signal and a current signal for each phase of the multi-phase power system; calculating a product of the voltage signal for each phase of the multi-phase power system with one of the current signals such that the product is between a voltage signal for one phase and a current signal for a different phase for at least two of the products; summing the calculated products; and identifying the possible existence of a fault in the multi-phase power system based on a frequency analysis of the summed calculated products.

    Abstract translation: 一种评估多相电力系统状况的方法，包括以下步骤：获取多相电力系统各相的电压信号和电流信号; 使用所述电流信号之一来计算所述多相电力系统的各相的电压信号的乘积，使得所述乘积位于所述一相的电压信号与所述产品中的至少两个产品的不同相的电流信号之间 ; 计算产品的总和; 并基于对所计算出的产品的频率分析，确定多相电力系统中可能存在的故障。

    OPEN SWITCH FAULT DETECTION AND IDENTIFICATION IN A TWO-LEVEL VOLTAGE SOURCE POWER CONVERTER
    2.
    发明申请
    OPEN SWITCH FAULT DETECTION AND IDENTIFICATION IN A TWO-LEVEL VOLTAGE SOURCE POWER CONVERTER 有权
    两级电源电源转换器中的开路故障检测和识别

    公开(公告)号：US20160216332A1

    公开(公告)日：2016-07-28

    申请号：US14991139

    申请日：2016-01-08

    Applicant: ROLLS-ROYCE plc

    Inventor： Chandana Jayampathi GAJANAYAKE ,  Shantha Dharmasiri Gamini JAYASINGHE ,  Sivakumar NADARAJAN ,  Amit Kumar GUPTA

    IPC: G01R31/327 ,  G01R31/40

    CPC classification number: G01R31/42

    Abstract: A method of open-switch fault detection in a two-level voltage source power converter comprises the steps of: i. acquiring the waveforms of three-phase alternating current of the two-level voltage source power converter; ii. calculating at least a first time derivative of each acquired waveform; and iii. using the at least first time derivatives to determine whether an open-switch fault is present in the two-level voltage source power converter.

    Abstract translation: 一种二电平电压源功率转换器中开路故障检测的方法，包括以下步骤： 获取二电平电压源功率转换器的三相交流电波形; ii。 计算每个获取的波形的至少第一时间导数; 和iii。 使用至少第一次导数来确定两级电压源功率转换器中是否存在开路开关故障。

    FAULT DETECTION IN INDUCTION MACHINES
    3.
    发明申请
    FAULT DETECTION IN INDUCTION MACHINES 审中-公开
    感应机械故障检测

    公开(公告)号：US20150260794A1

    公开(公告)日：2015-09-17

    申请号：US14626026

    申请日：2015-02-19

    Applicant: ROLLS-ROYCE PLC

    Inventor： Subash C. ATHIKESSAVAN ,  Sivakumar NADARAJAN ,  Amit Kumar GUPTA ,  Sanjib K. PANDA

    IPC: G01R31/34 ,  G01R23/02

    CPC classification number: G01R31/343

    Abstract: A method of detecting a fault in an induction machine having one or more windings arranged to draw current at a supply frequency, the method including: performing a process of judging whether a respective sideband of one or more selected harmonics of the supply frequency exists at a predetermined fault frequency in a signal in the one or more windings; and determining that a fault has occurred if the judgement is positive; wherein in the judging process each of the selected harmonics of the supply frequency is a harmonic frequency of the supply frequency other than the supply frequency itself.

    Abstract translation: 一种用于检测感应电机中的故障的方法，所述感应电机具有布置成以电源频率抽取电流的一个或多个绕组，所述方法包括：执行判断电源频率中一个或多个所选谐波的相应边带是否存在于 在一个或多个绕组中的信号中预定的故障频率; 并确定如果判断为正，则发生故障; 其中，在所述判定处理中，所述供给频率的选择谐波中的每一个是供给频率本身以外的供给频率的谐波频率。

    RECTIFIER DIODE FAULT DETECTION IN BRUSHLESS EXCITERS
    4.
    发明申请
    RECTIFIER DIODE FAULT DETECTION IN BRUSHLESS EXCITERS 有权
    整流二极管故障检测在无刷电机中的应用

    公开(公告)号：US20150198655A1

    公开(公告)日：2015-07-16

    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

    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.

    Abstract translation: 一种检测交流信号整流电路中的二极管故障的方法，所述交流信号整流电路包括多个二极管，并且被布置为向负载提供经整流的输出电压，其中所述方法包括以下步骤：导出指示 的一次谐波频率的电压幅度与整个负载的整流输出电压的另一个谐波频率之比; 以及基于导出的操作值来确定在一个或多个二极管中是否发生故障。 一次谐波频率优选为基本谐波频率，和/或另一谐波频率优选为6次谐波频率。

    INVERTER CONTROL METHOD
    6.
    发明申请
    INVERTER CONTROL METHOD 审中-公开
    逆变器控制方法

    公开(公告)号：US20160315558A1

    公开(公告)日：2016-10-27

    申请号：US15092372

    申请日：2016-04-06

    Applicant: ROLLS-ROYCE plc

    Inventor： Meng Yeong LEE ,  Chandana Jayamapathi GAJANAYAKE ,  Shantha Dharmasiri Gamini JAYASINGHE ,  Sivakumar NADARAJAN ,  Amit Kumar GUPTA

    IPC: H02M7/537

    CPC classification number: H02M7/537 ,  H02M1/32 ,  H02M7/5387 ,  H02M7/5395 ,  H02M2001/327

    Abstract: A method of controlling an inverter, in which the inverter includes a single-phase inverter arrangement comprising a complementary pair of power switches, comprises the steps of:controlling the complementary pair of power switches with a modulating signal to output an AC signal;judging which of the power switches in the complementary pair of power switches is at a higher temperature;determining the magnitude and sign of a DC offset signal to apply to the modulating signal to reduce the total current in the power switch judged to be at the higher temperature; andapplying the DC offset signal to the modulating signal.

    Abstract translation: 将DC偏移信号应用于调制信号。

    FAULT DETECTION AND DIAGNOSIS IN AN INDUCTION MOTOR
    7.
    发明申请
    FAULT DETECTION AND DIAGNOSIS IN AN INDUCTION MOTOR 审中-公开
    感应电动机故障检测与诊断

    公开(公告)号：US20160266208A1

    公开(公告)日：2016-09-15

    申请号：US15050718

    申请日：2016-02-23

    Applicant: ROLLS-ROYCE plc

    Inventor： Subash Chandar ATHIKESSAVAN ,  Sivakumar NADARAJAN ,  Amit Kumar GUPTA ,  Sanjib Kumar PANDA ,  Chandana Jayampathi GAJANAYAKE

    IPC: G01R31/34

    CPC classification number: G01R31/346 ,  H02P29/0241

    Abstract: A method of detecting rotor and/or stator side faults in an induction motor. Signals indicative of three-phase stator currents of the induction motor are acquired (10) and converted (16) into three-phase current phasors. The three-phase current phasors are combined (16) to obtain a quantity having a DC component and an AC component. A frequency spectrum of the AC component is obtained (18) and compared (20,22) to a frequency spectrum of the AC component under healthy operating conditions in order to determine the presence of a rotor and/or stator side fault in the induction motor

    Abstract translation: 检测感应电动机中转子和/或定子侧故障的方法。 获取表示感应电动机的三相定子电流的信号（10）并将其转换为三相电流相量。 组合三相电流相量（16）以获得具有DC分量和AC分量的量。 获得交流分量的频谱（18）并比较（20,22）到健康运行条件下交流分量的频谱，以便确定感应电机中转子和/或定子侧故障的存在

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