Article
Physics, Applied
Lei Wang, Yi Li, Zekai Wang, Zijian Liu, Hong Li, Liqiu Wei, Yongjie Ding
Summary: In this study, the effects of magnetic field intensity near the inner magnetic pole on pole erosion of a 100 W permanent-magnet Hall thruster were investigated. The results showed that decreasing the magnetic field intensity near the inner magnetic pole significantly reduced the erosion rate, with a decrease of over 37.5% when the magnetic field intensity decreased by 20%. This reduction in erosion rate can be attributed to a decrease in the number of electrons reaching the magnetic pole and an increase in the potential of the pole, resulting in a decrease in ion sputtering.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Applied
Holak Kim, Seunghoon Lee, Guentae Doh, Dongho Lee, Wonho Choe
Summary: By tailoring the magnetic field in a cylindrical Hall thruster, this study has demonstrated higher ion current and propellant efficiencies, reduced wall interaction, and observed a large fraction of multiply charged ions.
JOURNAL OF APPLIED PHYSICS
(2022)
Review
Engineering, Aerospace
Vlad-George Tirila, Alain Demaire, Charles N. Ryan
Summary: This paper provides a comparative study of feasible alternatives to xenon as the propellant for Hall thrusters, including other noble gases, molecular propellants, and condensable elements. Various considerations of using alternative propellants are outlined, and a comprehensive database of experimentally measured Hall thruster performance is compiled. The measured performance using various propellants is compared to the results of a theoretical propellant performance estimation.
Article
Automation & Control Systems
Dmitry Egorov, Ilya Petrov, Juha J. Pyrhonen, Joosep Link, Raivo Stern, Peter Sergeant, Bulent Sarlioglu
Summary: This study assesses the hysteresis behavior of two NdFeB PM grades with different magnetic properties in a PMSM. The results indicate that hysteresis loss resulting from structural imperfections and magnet geometry may introduce considerable loss in NdFeB PMs applied in rotating electrical machines.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Aerospace
J. M. Tejeda, M. Reza, F. Faraji, A. Knoll
Summary: This study proposes using radiofrequency excitation in single-stage Hall Effect Thrusters to improve their performance. The reliability of a 2D axial-radial plasma simulation software called PlasmaSim is verified and validated against experimental measurements. The impact of radiofrequency excitation on thruster performance and in-channel plasma properties is analyzed and quantified.
Article
Engineering, Aerospace
Vittorio Giannetti, Manuel Martin Saravia, Luca Leporini, Simone Camarri, Tommaso Andreussi
Summary: This paper presents a synergic experimental and numerical investigation of the breathing mode in a 5 kW-class Hall thruster. The calibrated model can predict the spatio-temporal distributions of the plasma properties with reasonable accuracy based on the discharge current signal. The augmented data obtained through the combination of experiments and calibrated model provides insights into the breathing mode oscillations and the evolution of plasma properties.
Article
Engineering, Electrical & Electronic
Zeyi Zhang, Hongjun Zhang
Summary: This paper investigates a distance sensor for the zero-power PEMS system, proposing a symmetric Hall-effect-based sensor. The sensor is capable of eliminating the magnetic field excited by the current and outputting the magnetic field produced by the magnet to calibrate the floating distance. The simulation results demonstrate its excellent performance against the tilting angle and the lateral offset, while the experimental demonstration validates its functionality.
IEEE SENSORS JOURNAL
(2023)
Article
Physics, Applied
O. Chapurin, A. I. Smolyakov, G. Hagelaar, Y. Raitses
Summary: The study investigates predator-prey models and their continuum analog in Hall thrusters, showing that a reduced 1D model can exhibit oscillations under specific conditions, while the full model can better capture the main properties of the breathing mode oscillations.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Lubos Brieda, Yevgeny Raitses, Edgar Choueiri, Roger Myers, Michael Keidar
Summary: This article explores the feasibility of testing Hall effect thrusters in a quasi-steady mode by pulsing the mass flow rate between nominal and low values to address testing challenges caused by high power levels. Numerical simulations indicate that sub-second durations are sufficient to achieve steady-state current and flow field distributions, allowing characterization of thruster performance and the near plume region.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Aerospace
Zhongkai Zhang, Guangchuan Zhang, Jiayun Qi, Yu Zhang, Yibai Wang, Zun Zhang, Haibin Tang, Jianjun Wu
Summary: This work proposes a novel method for directly measuring the roll torque of low power Hall-effect thrusters. The measurement device uses an elastic pendulum with the thruster mounted on the same axis, and the torque is reflected in the rotation of the movement part and amplified by the pendulum arm. The roll torque values are estimated for different power Hall-effect thrusters based on the reliable measurement results of low power ones, and this method also provides a new idea for evaluating the roll torque of other types of electric propulsion thrusters.
Article
Mechanics
Tuan Minh Hoang, David Vazquez Cortes
Summary: Linear stability of magnetic rings composed of permanently magnetized particles with the same magnetization is studied in this research, and the stability criterion is determined in closed form using Lagrange's approach and multipole moments. The loading scenario determines the instability modes through which the magnetic ring first loses its stability.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Physics, Fluids & Plasmas
C. E. Huerta, R. S. Martin, D. Q. Eckhardt, J. W. Koo
Summary: Extended convergent cross mapping is a powerful tool widely used for analyzing the dynamics of Hall-effect thrusters and other fields. It introduces data splitting and self-reconstruction to improve robustness and eliminate false links. The analysis shows that there is a qualitative agreement between the causality links and the calculated plumes in the thruster, indicating that charged particles carry information about the currents. The results of extended convergent cross mapping can also be used to estimate the harmonic frequencies in the oscillatory mode accurately.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Automation & Control Systems
Sirshendu Saha, Saikat Kumar Bera, Saurabh Pal, Satish Chandra Bera
Summary: The paper presents a modified non-contact Hall sensor based centrifugal and momentum force type flow transducer with simple design, low cost, and rugged construction. By utilizing the difference in outputs of the Hall sensors, a DC voltage signal nonlinearly related to flow rate can be obtained through the movement of the balance lever.
Article
Physics, Fluids & Plasmas
Timofey Chernyshev, Dariya Krivoruchko
Summary: This paper presents the results of a 2D kinetic simulation of the HET discharge, including the cathode plasma region, and discusses the formation process and mechanisms of 'anomalous transport' within it. The fluid force balance in HETs emerges from collisionless kinetic approach, providing a basis for quantitative estimations of HET parameters and scaling models. The acceleration mechanism in HETs is commonly described in terms of force balance, with the reactive force from accelerated ions balancing Ampere's force on a drift current loop.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Review
Engineering, Marine
Henrique Fagundes Gasparoto, Olivier Chocron, Mohamed Benbouzid, Pablo Siqueira Meirelles
Summary: Manoeuvrability is essential for the development of improved autonomous underwater vehicles, with research focusing on new hull shapes, thrusters, and enabling technologies such as vectorial thrusters based on water-jet or propellers. The use of magnetic coupling thrusters for competitive full waterproof solutions is detailed, with ideas proposed to enhance this new generation of underwater thrusters. Current limitations, like the use of non conductive hulls, are discussed, highlighting the potential for fully contactless vector thrust transmission.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)