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    POWER ELECTRONICS CONVERTER THERMAL MANAGEMENT
    11.
    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
    13.
    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
    14.
    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
    15.
    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。

    METHODS, SYSTEMS, BATTERY, CHARGING STATION
    16.
    发明申请
    METHODS, SYSTEMS, BATTERY, CHARGING STATION 有权

    公开(公告)号：US20250058669A1

    公开(公告)日：2025-02-20

    申请号：US18778519

    申请日：2024-07-19

    Applicant: ROLLS-ROYCE PLC ,  ROLLS-ROYCE DEUTSCHLAND LTD & CO KG

    Inventor： Sivakumar NADARAJAN ,  Philipp SCHILDT

    IPC: B60L53/66 ,  B60L53/65 ,  B60L53/68 ,  B60L53/80 ,  B64D27/357 ,  B64F1/35

    Abstract: A method for gathering inflight data during operation of an electric or hybrid-electric aircraft. The aircraft includes: a swappable battery pack, connected to an electrical system of the aircraft, the swappable battery pack including a data storage module accessible via a data interface of the swappable battery pack; and a control unit, connected to the swappable battery pack via the data interface. The method includes, while the aircraft is in flight, gathering, by the control unit, the inflight data from the aircraft and saving the gathered inflight data to the data storage module of the swappable battery pack.

    DATA LOGGING DEVICE FOR AN ELECTRIC AIRCRAFT
    17.
    发明公开
    DATA LOGGING DEVICE FOR AN ELECTRIC AIRCRAFT 审中-公开

    公开(公告)号：US20240217378A1

    公开(公告)日：2024-07-04

    申请号：US18536514

    申请日：2023-12-12

    Applicant: ROLLS-ROYCE plc

    Inventor： Sivakumar NADARAJAN ,  Viswanathan VAIYAPURI ,  Amit K. GUPTA

    IPC: B60L53/66 ,  G08G5/00

    CPC classification number: B60L53/66 ,  G08G5/0013

    Abstract: A data logging device for an electric aircraft having charging port for on-ground charging of energy storage system of electric propulsion system of aircraft. Device includes an aircraft-side data storage unit, data interface, trigger signal interface, and control unit. Control unit is configured to detect connection of charging port to ground-side charger based on trigger signal received by control unit from ground-side charger via trigger signal interface. Control unit is configured wherein a state of flight of electric aircraft, control unit collects inflight data from electric aircraft via data interface and saves inflight data to aircraft-side data storage unit. Control unit is also configured wherein a state of on-ground charging of electric aircraft, control unit, on receipt of trigger signal, sends inflight data saved on aircraft-side data storage unit via data interface to charger for forwarding to at least one of a data transmitter and a ground-side data storage unit.

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