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.

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.

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.

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

IPC: H02K11/35 ,  H02K11/26 ,  H02K11/27

CPC classification number: H02K11/35 ,  H02K11/26 ,  H02K11/27

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.

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。