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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。
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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
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.
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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.
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公开(公告)号：US20190383670A1
公开(公告)日：2019-12-19
申请号：US16437371
申请日：2019-06-11
Applicant: ROLLS-ROYCE plc
Inventor： Mohamed H. M. SATHIK , Rejeki SIMANJORANG , Chandana J. GAJANAYAKE , Sundararajan PRASANTH , Amit K. GUPTA
Abstract: A system, method and machine-readable instructions for monitoring a power electronics device. The system involves a semiconductor device, at least one sensor and a processor. The processor is configured to monitor a junction temperature of the semiconductor device by determining from the at least one sensor an on-state resistance of the semiconductor device and calculating the junction temperature of the semiconductor device according to a relationship between the on-state resistance of the semiconductor device and the junction temperature of the semiconductor device. The processor may apply an ageing coefficient to the on-state resistance.
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公开(公告)号：US20170366082A1
公开(公告)日：2017-12-21
申请号：US15601050
申请日：2017-05-22
Applicant: ROLLS-ROYCE plc
Inventor： Xiong LIU , Michael A. ZAGRODNIK , Amit K. GUPTA
CPC classification number: H02M1/4233 , H02M1/4216 , H02M5/4585 , H02M7/49 , H02M7/66 , H02M7/84 , H02M2001/4283 , H02P7/04 , Y02B70/126
Abstract: An electrical system including a three phase AC input supply and three or more H-bridge converter cells. Each H-bridge converter cell has: an active front end rectifier for receiving the three phase AC input supply and transforming it into a DC supply, thereby providing a rectifier current ii; a capacitor suitable to receive a capacitor current iC, the capacitor smoothing the DC supply; and an inverter suitable to receive an inverter current io, wherein io=ii−iC, said inverter transforming the received inverter current io into a single phase AC supply. The system also including a control subsystem, which provides a signal to each active front end rectifier to vary its respective rectifier current ii such that the difference between the rectifier current ii, provided by the active front end rectifier, and the inverter current io, received by the inverter, is substantially zero.
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Patent Agency Ranking
公开(公告)号：US20240297393A1
公开(公告)日：2024-09-05
申请号：US18589542
申请日：2024-02-28
Applicant: ROLLS-ROYCE Plc.
Inventor： Anand Prabhu MATHIVANAN , Pei Sin NG , Mohankumar PALANISAMY , Michael A. ZAGRODNIK , Yang Yueng Melvin YAP , Amit K. GUPTA
IPC: H01M50/291 , H01M10/613 , H01M10/6567 , H01M50/213
CPC classification number: H01M50/291 , H01M10/613 , H01M10/6567 , H01M50/213
Abstract: A battery cooling block, including: a housing defining a flow chamber and including a first and second port configured to allow flow of coolant through flow chamber along a first axis; the housing further including a plurality of compartments disposed in the flow chamber, each compartment extending along a respective compartment axis perpendicular to first axis and each compartment configured to receive respective cylindrical battery cell; wherein each compartment is defined by partially open compartment wall within flow chamber, compartment wall including a plurality of wall segments extending parallel to compartment axis and which are circumferentially spaced apart around compartment axis wherein respective battery cell is partially exposed to flow of coolant. A battery assembly, including: plurality of cylindrical battery cells; and battery cooling block as described above. Each of the plurality of cylindrical battery cells is received in respective one of the plurality of compartments of battery cooling block.
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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
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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公开(公告)号：US20240204628A1
公开(公告)日：2024-06-20
申请号：US18542934
申请日：2023-12-18
Applicant: ROLLS-ROYCE plc
Inventor： Rajaram SATHYANARAYAN , Sivakumar NADARAJAN , Viswanathan VAIYAPURI , Srikanth NARASIMALU , Amit K. GUPTA
Abstract: A computer-implemented method of determining a value of a reliability parameter of an electrical machine, the method includes: estimating an operating temperature of at least a part of the electrical machine based on a measure of a current drawn or supplied by the electrical machine; and determining the value of the reliability parameter based on the estimated operating temperature.
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公开(公告)号：US20240069089A1
公开(公告)日：2024-02-29
申请号：US18226597
申请日：2023-07-26
Applicant: ROLLS-ROYCE PLC
Inventor： Prasanth SUNDARARAJAN , Mohamed Sathik MOHAMED HALICK , Chandana J. GAJANAYAKE , Amit K. GUPTA
CPC classification number: G01R31/2607 , H02M1/0009 , H02M1/08 , H02M5/293
Abstract: Monitoring circuitry connectable to power conversion circuitry enclosed within packaging, the power conversion circuitry including terminals providing external connections to nodes of the power conversion circuitry enclosed within the packaging, the monitoring circuitry including: a comparator including a first input terminals connectable to first and second terminals of the power conversion circuitry and a second input terminal connected to a reference voltage, wherein the first and second terminals provide external connections to first and second nodes connected along respective current paths each connected to switching circuitry of the power conversion circuitry enclosed within the packaging, wherein the comparator detects a switch state of the switching circuitry based on a voltage generated at the first input terminal and the reference voltage; processing circuitry connected to the comparator and configured to monitor the power conversion circuitry based on the detected switch state and a signal of the power conversion circuitry.
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公开(公告)号：US20240063729A1
公开(公告)日：2024-02-22
申请号：US18358235
申请日：2023-07-25
Applicant: ROLLS-ROYCE plc
Inventor： Shuai WANG , Chandana J. GAJANAYAKE , Amit K. GUPTA
CPC classification number: H02M7/219 , H02J3/381 , H02M7/2173 , H02J2310/44
Abstract: An electrical machine with a rotor coupled to a drive shaft of an engine; a DC electrical network; a power electronics converter connected, on a DC-side, to the DC electrical network, and, on an AC-side, to the electrical machine, the power electronics converter comprising a plurality of transistors and associated diodes connected in anti-parallel with the transistors; and a controller configured to control switching of the transistors so that the converter either inverts DC power to AC power or rectifies AC power to DC power. The controller is further configured, responsive to a determination that there is a fault in the DC electrical network, to operate in a fault mode in which the controller controls the switching of the transistors so that a fault current is shared between the transistors and the associated diodes.
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