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    FAULT DETECTION AND DIAGNOSIS
    1.
    发明申请
    FAULT DETECTION AND DIAGNOSIS 审中-公开
    故障检测和诊断

    公开(公告)号：US20160216334A1

    公开(公告)日：2016-07-28

    申请号：US14988302

    申请日：2016-01-05

    Applicant: ROLLS-ROYCE plc

    Inventor： Subash C. ATHIKESSAVAN ,  Sivakumar NADARAJAN ,  Amit K. GUPTA ,  Sanjib K. PANDA ,  Chandana J. GAJANAYAKE

    IPC: G01R31/34

    CPC classification number: G01R31/34 ,  G01R23/20 ,  G01R31/343 ,  G01R31/346

    Abstract: A method of detecting a stator fault in a multi-phase current induction machine including the steps of: obtaining a respective frequency spectrum for each of the current phases in the induction machine; deriving, from each frequency spectrum, a value for the ITHD (Inverse current Total Harmonic Distortion) for the respective current phase; calculating an ITHD deviation value corresponding to the maximum deviation for the derived ITHD values; judging whether the calculated ITHD deviation value differs from a reference deviation value; and determining, in response to a positive judgement, that there is a stator fault.

    Abstract translation: 一种检测多相电流感应电机中的定子故障的方法，包括以下步骤：为感应电机中的每个电流相位获得相应的频谱; 从每个频谱推导出用于各个当前阶段的ITHD（逆电流总谐波失真）的值; 计算对应于所导出的ITHD值的最大偏差的ITHD偏差值; 判断所计算的ITHD偏差值是否与参考偏差值不同; 并且响应于肯定判断确定存在定子故障。

    POWER ELECTRONICS CONVERTER
    2.
    发明申请
    POWER ELECTRONICS CONVERTER 有权

    公开(公告)号：US20250035714A1

    公开(公告)日：2025-01-30

    申请号：US18768149

    申请日：2024-07-10

    Applicant: ROLLS-ROYCE plc

    Inventor： Mohamed Sathik MOHAMED HALICK ,  Sivakumar NADARAJAN ,  Viswanathan VAIYAPURI ,  Amit K. GUPTA

    IPC: G01R31/56 ,  G01R31/00 ,  H02M1/00 ,  H02M1/32

    Abstract: A power electronics converter connectable, on a DC-side, to a DC electrical network and either, on an AC-side, to an electrical machine coupled to a drive shaft of an engine or propulsor, or, on a second DC-side, to a battery pack. The power electronics converter includes: a power conversion unit including a plurality of semiconductor switching elements and a DC-link; and a gate driver unit, configured to control the semiconductor switching elements so that the power conversion unit: inverts DC power received from the DC electrical network to AC power and provides the AC power to the electrical machine, rectifies AC power received from the electrical machine to DC power and provides the DC power to the DC electrical network, or performs DC-DC conversion between the DC-electrical network and the battery pack; wherein the gate driver unit includes an equipment health monitoring component.

    DATA LOGGING AND TRANSMISSION DEVICE FOR AN ELECTRIC AIRCRAFT
    5.
    发明公开
    DATA LOGGING AND TRANSMISSION DEVICE FOR AN ELECTRIC AIRCRAFT 审中-公开

    公开(公告)号：US20240217353A1

    公开(公告)日：2024-07-04

    申请号：US18536570

    申请日：2023-12-12

    Applicant: ROLLS-ROYCE plc

    Inventor： Sivakumar NADARAJAN ,  Shanjiao JIANG ,  Thiha KYAW ,  Amit GUPTA

    IPC: B60L53/14 ,  H02J7/00 ,  H02J13/00

    CPC classification number: B60L53/14 ,  H02J7/00032 ,  H02J7/0047 ,  H02J13/00022 ,  B60L2200/10

    Abstract: A data logging and transmission device is provided for an electric aircraft having a charging port for on-ground charging of an energy storage system of an electric propulsion system of the aircraft. The device includes: a control unit, data storage unit, data transmitter, and sensor configured to detect connection of charging port of the electric aircraft to ground-side charger and then issue a trigger signal to the control unit. The control unit is configured wherein a state of flight of the electric aircraft, the control unit collects inflight data from the electric aircraft and saves the inflight data to the data storage unit. The control unit is also configured such that in a state of on-ground charging of the electric aircraft, the control unit, on receipt of the trigger signal, commands the data transmitter to transmit the inflight data saved on the data storage unit to a remote receiver.

    POWER ELECTRONICS CONVERTER THERMAL MANAGEMENT
    6.
    发明公开
    POWER ELECTRONICS CONVERTER THERMAL MANAGEMENT 审中-公开

    公开(公告)号：US20240186889A1

    公开(公告)日：2024-06-06

    申请号：US18512170

    申请日：2023-11-17

    Applicant: ROLLS-ROYCE plc

    Inventor： Sivakumar NADARAJAN ,  Mohamed Sathik MOHAMED HALICK ,  Viswanathan VAIYAPURI ,  Sundararajan PRASANTH ,  Amit K. GUPTA

    IPC: H02M1/32 ,  H02M1/00 ,  H02M7/5387

    CPC classification number: H02M1/327 ,  H02M1/0009 ,  H02M7/53871

    Abstract: The disclosure relates to thermal management of a power electronics converter. An example embodiment includes a power electronics converter comprising: a first set of terminals connectable to a first voltage supply; a second set of terminals connectable to a second voltage supply; a plurality of semiconductor switches connected between the first and second sets of terminals; a voltage sensor connected to measure a voltage across the second supply; a current sensor connected to measure a current through the second supply; and a controller connected to provide switching signals to the semiconductor switches and to receive voltage and current signals from the voltage and current sensors, the controller configured, for each of the semiconductor switches, to: determine a junction temperature of the semiconductor switch; compare the determined junction temperature to a reference temperature; and adjust a switching gate voltage applied to the semiconductor switch.

    OPEN SWITCH FAULT DETECTION AND IDENTIFICATION IN A TWO-LEVEL VOLTAGE SOURCE POWER CONVERTER
    8.
    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
    9.
    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
    10.
    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。

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