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iEnergy 2022年第1期1卷 82-99页

作者： Ronghai Qu You Zhou Dawei Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and Technology430074 WuhanChina School of Electrical and Electronic Engineering Nanyang Technological Uni-versity639798Singapore

As one of the greatest inventions of human beings,the electric machine(EM)has realized the mutual conversion between electrical energy and mechanical energy,which has essentially led humanity into the age of electrification and greatly promoted the progress and development of human *** paper will briefly review the development of EMs in the past two centuries,highlighting the historical milestones and investigating the driving force behind *** the innovation of theory,the progress of materials and the breakthrough of computer science and power electronic devices,the mainstream EM types has been continuously changing since its *** paper will not only summarize the basic operation principle and performance characteristics of traditional EMs,but also that of the emerging types of ***,control and drive system,as a nonnegligible part of EM system,will be complementarily ***,due to the background of global emission reduction,industrial intelligentization and transportation electrification,EM industry will usher again in a golden period of ***,several foreseeable future developing trends will be analyzed and summarized.

关键词： Electric machine(EM) historical review industrial applications research hotspot technology development topology

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Characteristics of the SOL ion-to-electron temperature ratio on the J-TEXT tokamak with different plasma configurations

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Plasma Science and technology 2024年第2期26卷 13-21页

作者：李存凯梁云峰江中和周松华建坤阳杰杨庆虎 Alexander KNIEPS Philipp DREWS 徐鑫毛飞越谢伟杨雨桐郭金龙李杨波任正康陈志鹏王能超 the J-TEXT Team International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung—PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Julich 52425Germany 不详

Accurate measurement of the average plasma parameters in the edge region,including the temperature and density of electrons and ions,is critical for understanding the characteristics of the scrape-off layer(SOL) and divertor plasma transport in magnetically confined fusion *** the J-TEXT tokamak,a multi-channel retarding field analyzer(RFA) probe has been developed to study average plasma parameters in the edge region under various poloidal divertor and island divertor *** edge radial profile of the ion-to-electron temperature ratio,τ_(i/e),has been determined,which gradually decreases as the SOL ion self-collisionality,v_(SOL)*,*** is broadly consistent with what has been observed previously from various tokamak ***,the comparison of experimental results under different configurations shows that in the poloidal divertor configuration,even under the same v_(SOL)*,τ_(i/e) in the SOL region becomes smaller as the distance from the X-point to the target plate *** the island divertor configuration,τ_(i/e) near the O-point is higher than that near the X-point at the same v_(SOL)*,and both are higher than those in the limiter *** results suggest that the magnetic configuration plays a critical role in the energy distributions between electrons and ions at the plasma boundary.

关键词： ion temperature island divertor poloidal divertor retarding field analyzer(RFA)probe

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First-Principles Study on the Cu–Cr Interfaces in Vacuum Circuit Breaker Contacts 4th

First-Principles Study on the Cu–Cr Interfaces in Vacuum Ci...

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4th International Symposium on Insulation and Discharge Computation for Power Equipment, IDCOMPU 2023

作者： Gui, Xianxian Wu, Chuanqi Yuan, Zhao Wang, Cao Liu, Liming Chen, Lixue State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China State Grid Hubei Electric Power Research Institute Hubei Wuhan430077 China

ISBN: (纸本)9789819974047

Based on the experimental phenomenon that the breakdown position of the CuCr contact head in a vacuum circuit breaker may be the Cu–Cr phase boundary, the Cu–Cr interfacial binding models have been developed. The work function, work of interfacial separation, interfacial energy, charge transfer, and charge density distribution of Cu, Cr and W, Fe, Ni and Mo doped Cu/Cr interfaces are calculated from the first principles. The CuCr interface junction was found to have a smaller work function than pure copper and pure chromium. The reduced work function is prone to field emission, thus increasing the possibility of electrical breakdown. Three interfacial binding models Cu(110)/Cr(110), Cu(111)/Cr(111) and Cu(110)/Cr(100) are established in this paper. By comparing the separation work and interfacial energy, it is found that Cu(111)/Cr(111) is relatively stable. The charge transfer is ordered as W > Mo > Ni > Fe from large to small. This order is roughly the same as the atomic numbers of the four metals. The doping of W, Fe, Ni and Mo to make their work function reach the expected value is ranked as W > Ni > Fe > Mo. In this paper, we provide a theoretical basis for increasing the voltage strength of vacuum circuit breakers. © Beijing Paike Culture Commu. Co., Ltd 2024.

关键词： Electric circuit breakers

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Modeling Analysis of Efficiency Improvement of Passive Array Coils Involved in Wireless Power Transfer System 1

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10th Frontier Academic Forum of Electrical engineering, FAFEE 2022

作者： Chen, Mengmeng Lu, Yang Liu, Renzhe Wu, Zhousen Rong, Cancan Xia, Chenyang Liao, Zhijuan Liu, Xu School of Electrical Engineering China University of Mining and Technology Xuzhou221116 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (数字)9789819934041

ISBN: (纸本)9789819934034

The transmission efficiency of wireless power transfer system is generally low due to the large transmission distance. In addition, the transmitter and receiver are usually fixed, which will lead to weak robustness as well. In the paper, the solenoid array coils (SAC) are design to increase the mutual coupling between the two coils, which will enhance the transfer efficiency. SACs are composed of recycled array coils (RAC) and concentrated array coils (CAC), which are used to improve the density of magnetic lines of flux between the transmitter and the receiver. In this paper, the design process and modeling process are described in detail. The simulation results show that the transmission efficiency of the wireless power transfer system is improved from 72.79% to 83.01% after optimization. Moreover, the distribution of the system magnetic field and the circuit simulation waveforms also verify the correctness and feasibility of the passive array coils analysis and design, and provide a solution for the existing engineering problems. © Beijing Paike Culture Commu. Co., Ltd. 2023.

关键词： Circuit simulation

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Effect of electrochemical hydrogen charging on the microstructure and mechanical behavior of a duplex structured Mg-8wt.%Li alloy

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Journal of Magnesium and Alloys 2025年第2期13卷 668-680页

作者： Shuo Wang Daokui Xu Baojie Wang Dongliang Wang Zhiqiang Zhang Li Liu Jie Chen Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Engineering Research Center of Advanced Materials Preparing Technology Ministry of EducationNortheastern UniversityShenyang110819China Binzhou Institute of Technology BinzhouShandong Province256606China Shandong Key Laboratory of Advanced Aluminium Materials and Technology BinzhouShandong Province256606China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang110159China Spallation Neutron Source Science Center Dongguan523803China

In this work,through performing microstructural characterization,tensile testing and failure analysis,the influence of electrochemical hydrogen charging on the microstructure and mechanical behavior of an as-cast Mg-8wt.%Li alloy was *** revealed that after being hydrogen charged at 50 mA/cm2 for respectively 3 h,6 h and 18 h in 0.1 M NaCl solution,obvious HID occurred and the damage degree was gradually increased with the hydrogen charging *** the sample being hydrogen charged for 3 h,micro pores with the diameter ranging from 10~30µm were formed and preferentially present inα-Mg ***,micro cracks with the length ranging from 10~50µm mainly initiated inα-Mg phase,atα-Mg/β-Li interfaces and the peripheries of *** the increase of hydrogen charging time,the numbers of pores and cracks were obviously *** results revealed that the hydrogen charging can simultaneously decrease the tensile strength and ductility of the *** with the uncharged sample,the tensile yield strength,ultimate tensile strength and the elongation ratio to failure were respectively reduced by 5.7%,7.3%,31.7%for the 3h-charged sample and 24.6%,24.8%,67.0%for the 18h-charged *** analysis indicated that hydrogen charging can induce the brittle cracking of the alloy and the size of brittle cracking region being composed of quasi-cleavage facets and interfacial cracks on the fracture surfaces was increased with the hydrogen charging time.

关键词： Magnesium-lithium alloy Microstructure Hydrogen-induced damage Hydrogen embrittlement Mechanical behavior

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Temporal electric field of a helium plasma jet by electric field induced second harmonic(E-FISH)method

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Plasma Science and technology 2023年第1期25卷 43-52页

作者：李旭晋绍珲宋珂聂兰兰刘大伟卢新培 State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Center of Stomatology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030People's Republic of China School of Stomatology Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030People's Republic of China

Electric field is an important parameter of plasma,which is related to electron temperature,electron density,excited species density,and so *** this work,the electric field of an atmospheric pressure plasma jet is diagnosed by the electric field induced second harmonic(E-FISH)method,and the time-resolved electric field under different conditions is *** positive pulse voltage is applied,the electric field has a peak of about 25 kV cm-1at the rising edge of the voltage pulse.A dark channel is left behind the plasma bullet and the electric field in the dark channel is about 5 kV *** the other hand,when negative pulse voltage is applied,the electric field has a peak of-16 kV cm-1when the negative voltage is increased to-8 kV.A relatively bright channel is left behind the plasma head and the electric field in this relatively bright channel is about-6 kV *** the pulse rising time increases from 60 to 200 ns,the peak electric field at both the rising edge and the falling edge of the voltage decreases *** 0.5%of oxygen is added to the main working gas helium,the peak electric field at the rising edge is only about 15 kV *** the other hand,when 0.5%nitrogen is added,the peak electric field increases especially at the falling edge of the voltage pulse,where it increases reversely from-12 to-16 kV cm-1(the minus sign only represents the direction of electric field).

关键词： atmospheric pressure plasma jet electric field electric field induced second harmonic

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Special issue on the 70th anniversary of HUST

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Plasma Science and technology 2022年第12期24卷 4-5页

作者： Xiwei HU International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electric and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China

Huazhong University of Science and technology (HUST) celebrates its 70th anniversary in *** was transferred to a comprehensive and modern university on the international level in the 1980s from its traditional engineering predecessor,Huazhong Institute of technology,founded in the early 1950s as part of China’s academic institution reorganization.

关键词： anniversary 70t transferred

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Structural and Luminescent Properties of Mg_(0.25-x)Al_(2.57)O_(3.79)N_(0.21):xMn^(2+)Green-Emitting Transparent Ceramic Phosphor

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Journal of Wuhan University of technology(Materials Science) 2024年第3期39卷 533-540页

作者：郝留成 MIAO Xiaojun LI Kai ZHONG Jianying 涂兵田 YANG Zhangfu 王皓 Pinggao Group Co. LtdPingdingshan 467001China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 430070China School of Materials Science and Engineering Anhui University of Science and TechnologyHuainan 232001China

A series of spinel-type Mg_(0.25-x)Al_(2.57)O_(3.79)N_(0.21):xMn^(2+)(MgAlON:xMn^(2+))phosphors were synthesized by the solid-state reaction *** transparent ceramic phosphors were fabricated by pressureless sintering followed by hot-isostatic pressing(HIP).The crystal structure,luminescence and mechanical properties of the samples were systematically *** transparent ceramic phosphors with tetrahedrally coordinated Mn^(2+)show strong green emission centered around 515 nm under blue light *** the Mn^(2+)concentration increases,the crystal lattice expands slightly,resulting in a variation of crystal field and a slight red-shift of green emission *** weak absorption peaks in the transmittance spectra originate from the spin-forbidden ^(4)T_(1)(^(4)G)→^(6)A_(1) transition of Mn^(2+).The decay time was found to decrease from 5.66 to 5.16 ms with the Mn^(2+)*** present study contributes to the systematic understanding of crystal structure and properties of MgAlON:xMn^(2+)green-emitting transparent ceramic phosphor which has a potential application in high-power light-emitting diodes.

关键词： transparent ceramic phosphor green emission MgAlON photoluminescence

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A Rapid Risk Assessment Method for Hydrogen-Electric-Thermal Integrated Energy Systems

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Smart Power 2025年第5期53卷 1-7页

作者： Zhou, Yijia Peng, Hongyi Yan, Mingyu State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

To address the risk assessment problem of hydrogen-integrated energy systems under uncertain scenarios involving renewable energy integration, this paper proposes a rapid risk assessment method for hydrogen-electric-thermal integrated energy systems, aiming to enhance the efficiency of risk assessment and analysis in such systems. First, a hydrogen-electric-thermal integrated energy system model is established, and a risk assessment framework for the integrated energy system is constructed. Then, based on the Karush-Kuhn-Tucker(KKT)conditions and optimal partition theory, the space reflecting renewable energy output fluctuations is divided into multiple critical regions. Risk assessment metrics under uncertain scenarios are calculated using linear mapping relationship matrices derived from these critical regions. Finally, simulation analysis of an electric-hydrogen-thermal case study verifies the feasibility and efficiency of the proposed method in assessing risks for hydrogen-electric-thermal integrated energy systems. © 2025 Zhihui Dianli Bianjibu. All rights reserved.

关键词： Risk assessment

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Design of Power Supply for FRC Plasma Thruster Driven by Pulsed RMF

Design of Power Supply for FRC Plasma Thruster Driven by Pul...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Zhang, YiSong Yang, Yong Huang, Yuxuan Yi, Xiaopeng Lv, Chaofan Rao, Bo Lv, Fangwei Zhang, Ming School of Electrical and Electronic Engineering Huazhong University of Science and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

The Field-reversed configuration (FRC) plasma thruster is a propulsion device driven by Pulsed Rotating magnetic field (RMF) to generate thrust. An FRC plasma thruster prototype has been built. The RMF antennas are designed with very high parameters namely a peak current of 4 kA, a resonant frequency of 150 kHz. Thus, a high voltage, high current pulsed power supply is required to satisfy the design. This article mainly presents the challenges and solutions in the design of the power supply system. First, 4 sets of power supplies are used to feed the RMF coils, which results in design parameters of 4 kA/3.5 kV for each power supply. Then, stray parameters control and loss analysis were done to improve power supply efficiency. Experimental tests are also performed on the system. In conclusion, the designed power supply system can satisfy the requirements of high operation parameters and high controllability. © 2024 IEEE.

关键词： Pulsed plasma thrusters

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