HAL Portal UTC Université de Technologie de Compiègne
Not a member yet
11652 research outputs found
Sort by
Adaptive Bias Current Control of an Active Magnetic Bearing Under Motion-Induced Eddy Currents
No full textInternational audienceThis paper investigates the impact of motion-induced eddy currents on the dynamic performance of active magnetic bearings (AMBs) with a solid rotor. Since these eddy currents weaken the magnetic field in the air gap, the force exerted on the rotor is reduced which affects the dynamic behaviour of the AMB. An analytical model of the change in magnetic field distribution is presented and compared with simulation results using the finite element method for different rotor speeds. An adaptive control approach comprising a parameter estimation algorithm and a PI controller is implemented to mitigate these effects. This is based on an augmented Kalman filter which estimates the bias current corresponding to the weakened magnetic field. Based on this estimate, the actual bias current is adapted in order to counteract the reduction in magnetic field. Experimental results of the adaptive algorithm are presented and compared to simulation results
Drivetrain Loss Analysis for Various Switching Frequencies and Modulation Strategies Applied to IPMSMs
No full textInternational audienceThis paper presents holistic loss simulations for round wire interior permanent magnet synchronous machines (IPMSMs) influenced by switching frequency and modulation strategy. Pulse width modulation (PWM) current waveforms, calculated with a precise nonlinear machine model, serve as input to a current-based finite element analysis (FEA) loss simulation in a two-step approach. Simulation and measurements align closely in test bench validations
Impact of PWM Modulation Strategies on Bearing Currents in Electrically Excited Synchronous Motors
No full textInternational audienceBearing failures are a critical issue in electrically excited synchronous machines (EESMs), particularly due to electrical erosion caused by high-frequency converters in modern electric and hybrid electric Vehicles. This phenomenon, driven by common-mode currents and parasitic capacitances, significantly impacts the reliability and performance of rotating machinery. This paper investigates the impact of various converter control strategies in mitigating bearing erosion. Through comprehensive modeling of the complete drive system-including motor components and power electronics-simulations are performed to evaluate the effectiveness of different PWM approaches and their combinations on reducing bearing voltage and current. The results provide valuable insights into the optimal control strategies that minimize electrical corrosion, offering a pathway to enhanced durability and performance for EESM-based systems
Grey Box Identification of SiC MOSFET Modules in Short Circuit
No full textInternational audienceIn this work we apply the paradigm of grey box identification of dynamical systems to the recovery of unknown parameters appearing in the equations governing short circuit type I in SiC MOSFET high current 2kV modules
Developing a Model-in-the-Loop Testbench for Battery Management Systems: Advancing Test Methodologies for State-of-X Estimation
No full textInternational audienceLithium-ion battery systems require robust BMS for safety and reliability. Extensive BMS testing presents challenges like safety risks, long testing times, and variability. To address these issues and expedite development, a testing methodology based on X-in-the-Loop (XiL) paradigms is proposed.This methodology ensures comprehensive validation and cost reduction. Using MathWorks Simulink and Simscape Batteries, a virtual testbench is developed to model both the BMS and the battery pack. The BMS includes virtualized master and slave units, emulating sensor behavior and SoC estimation algorithms. A virtual battery cycler enables specific current profile testing. As case study, this setup benchmarks SoC estimation algorithms at MiL and SiL levels, with potential HiL expansion for real BMS device validation, enhancing testing capabilities and automating procedures for safer, faster BMS development
Advancement of the SI-SIDO Boost-Buck-Boost Converter with Continuous Switching Method for Bipolar LVDC Applications
No full textInternational audienceThis paper presents the enhanced performance of the single-inductor single-input dual-output boost-buck-boost DC-DC converter with a novel continuous switching method. Building on previous work, this method optimizes performance under varying load and input conditions, enabling higher power applications and greater adaptability for bipolar low voltage DC systems
Novel Control Methodologies of Back-to-Back B6 Bridges for an Application-Related Stress Test Setup
No full textInternational audienceBack-to-back (B2B) B6 bridges stand out as the go-to solution for power cycling and application related stress tests in the reliability sector of power electronics. This paper delves into novel control strategies for the electro-thermal stress reconstruction of Device-under-Tests (DUTs), with a specific focus on signal shape reconstruction and current ripple reduction. A novel precalculation method is introduced, enabling the prediction of an operating point for open-loop control, thus facilitating the reconstruction of complex signal shapes. The presented concepts are rigorously evaluated through hardware testing and real measurement results, underlining their practical viability in real-world applications
Computing for literature studies : how digital humanities challenge computer science
No full textInternational audienc
Participatory ecodesign of crop management based on Life Cycle Assessment: an approach to inform the strategy of a Protected Denomination of Origin. A case study in viticulture
No full textInternational audienceSince the context on environmental issues is challenging, the Cognac protected denomination of origin (PDO) adopted life cycle assessment (LCA) to inform its environmental strategy, initially focusing on vineyard soil management. This study developed a participatory eco-design approach involving stakeholders to inform the PDOs’ strategy for transitioning to less impactful crop management practices. It did this by drawing on literature that emphasises the use of participatory design, serious games, and LCA to foster knowledge sharing, engagement, and sustainability assessment. The approach that was put to the test in the Cognac PDO involved 17 elected officials with varying levels of experience. The participants used the serious game known as Vitigame (a game done for participatory ecodesign in viticulture) to ecodesign a soil management and fertilisation pathway for 2030, with the process guided by the results of the LCA. Exchange dynamics, LCA results, and participant feedback were analysed. The study revealed diverse dynamics and efficient ecodesign strategies among the participant groups, which resulted in a reduction of environmental impacts by up to 51% and raised new questions for the territory. The diversity of participants presented challenges, highlighting the need to improve LCA knowledge sharing. The workshop’s results could inform the PDO’s strategic planning. The interest of this innovative process including a serious game was confirmed, suggesting potential applications to other viticultural PDOs and adaptability to diverse sectors
RF Antenna Design and Integration for Neuromorphic Devices
No full textInternational audienceNeuromorphic devices are systems made up of artificial neurons that replicate the function of biological neurons by generating spike trains. It offers several advantages for sensing such as the encoding of the measured signal in space and time domains with a very low power consumption. Integrating an antenna with the neuron is however challenging and differs quite significantly from the common scenario where an antenna is first designed for free-space operation, matched to a 50 Ω load and subsequently integrated on complex platforms to fine-tune the radiation properties and input impedance. Indeed, the antenna open-circuit voltage must first be precisely calculated and designed to correspond to the excitation voltage range of the neuron. This paper presents the methodology to design and integrate an antenna to a neuromorphic neuron at a frequency of 20 MHz