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Analysis of an Axial-flux Slotted Limited-angle Torque Motor with Quasi-Halbach Array for Torque Performance Improvement

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CES Transactions on Electrical Machines and Systems 2023年第3期7卷 266-274页

作者： Mingjie Wang Dawei Li Ronghai Qu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China IEEE

Better torque performance and higher reliability have long been the focus of research for slotted limited-angle torque motors(LATMs),which are primarily used to position first-stage valves in electrohydraulic *** paper presents a high reliability axial-flux slotted LATM with quasi-Halbach array for torque performance improvement including constant torque range(CTR)and output ***,the structure with two sets of windings and the operation principle of the proposed slotted LATM is ***,a brief design procedure is presented,the structure selections of open slot and double-stator single-rotor(DSSR)interior rotor with surface mounted quasi-Halbach permanent magnet(PM)array are illustrated,and the geometric parameters are optimized to obtain the optimal design of the proposed slotted ***,3-D finite-element method(FEM)is employed to compare the proposed slotted LATM with the conventional surface mounted PM slotted LATM in terms of cogging torque,no-load back EMF,and output torque,and the results show that the proposed LATM with quasi-Halbach array has a 10%improvement in output torque and a 25%improvement in ***,the flux linkages and torque performance of the two sets of windings under various conditions verify good magnetic ***,prototypes of two different rotor types are manufactured and a series of experiments are performed to validate the analysis.

关键词： Limited-angle torque motor(LATM) Axial-flux machine Quasi-Halbach array Finite-element method(FEM) Cogging torque Torque performance

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Nanopore-rich NiFe LDH targets the formation of the high-valent nickel for enhanced oxygen evolution reaction

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Nano Research 2023年第2期16卷 2286-2293页

作者： Qunlei Wen Shuzhe Wang Ruiwen Wang Danji Huang Jiakun Fang Youwen Liu Tianyou Zhai State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Nickel-iron layered double hydroxides(NiFe LDHs)represent a promising candidate for oxygen evolution reaction(OER),however,are still confronted with insufficient activity,due to the slow kinetics of electrooxidation of Ni^(2+)cations for the high-valent active ***,nanopore-rich NiFe LDH(PR-NiFe LDH)nanosheets were proposed for enhancing the OER activity together with *** the designed catalyst,the confined nanopores create abundant unsaturated Ni sites at edges,and decrease the migration distance of protons down to the scale of their mean free path,thus promoting the formation of high-valent Ni^(3+)/^(4+)active *** unique configuration further improves the OER stability by releasing the lattice stress and accelerating the neutralization of the local acidity during the phase ***,the optimized PR-NiFe LDH catalysts exhibit an ultralow overpotential of 278 mV at 10 mA∙cm^(−2)and a small Tafel slope of 75 mV∙dec^(−1),which are competitive among the advanced LDHs based ***,the RP-NiFe LDH catalyst was implemented in anion exchange membrane(AEM)water electrolyzer devices and operated steadily at a high catalytic current of 2 A over 80 *** results demonstrated that PR-NiFe LDH could be a viable candidate for the practical *** concept also provides valuable insights into the design of other catalysts for OER and beyond.

关键词： nickel-iron layered double hydroxides(NiFe LDHs) water oxidation nanopores high-valent sites

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Study of Star-Delta Soft Switch to Extend AC Motor High Speed Operation Region

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CES Transactions on Electrical Machines and Systems 2023年第3期7卷 248-255页

作者： Yixuan Shuai Dong Jiang Zhuo Chen Zicheng Liu Haijing Sun Peng Li IEEE State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

In traction application,speed range of motor is an important index for motor *** AC motor control,the maximum speed of the motor is limited by the output voltage capability of the traditional three-phase inverter with star connenction of *** the star connection to delta connection in high-speed range can extend the speed *** order to extend the speed operation region,star-delta switch proposed by many literatures relies on mechanical relay,which needs a dead zone of tens of milliseconds and seriously affects torque ***,the traditional method will cause current overshoot during the switch transient process,decreasing the device security and *** at the defects existing in the star-delta hard switching,this paper proposes a star-delta soft switching *** adding extra power electronics devices,DC-bus capacitor is used to provide the path of zero axis current in the transient process,which helps to achieve the smooth torque output and zero current switch in the *** have been done to validate the performance of the proposed *** switching transient from star to delta connection in the motor drive can be much more stable than hard switching method.

关键词： Speed range Soft switch 0-axis current Zero current switch

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DEVELOPMENT OF THE BEAM DIAGNOSTIC SYSTEM OF THE HUST-PTF TRANSPORT LINES 13

DEVELOPMENT OF THE BEAM DIAGNOSTIC SYSTEM OF THE HUST-PTF TR...

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13th International Beam Instrumentation Conference, IBIC 2024

作者： Zhou, Shaokun Liu, Chengyong Chen, Yu Qin, Bin Chen, Qushan Liu, Xu Li, Dong Chen, Aote Liao, Yicheng Luo, Ruiying Wang, Wei State Key Lab. of Advanced Electromagnetic Engineering & Technology Huazhong University of Science & Technology Wuhan China

ISBN: (纸本)9783954502493

Huazhong University of Science and technology is building a cyclotron-based Proton Therapy Facility (HUST-PTF). The facility mainly consists of a 240 MeV superconducting cyclotron, a beam transport line, a fixed treatment room and two rotational treatment rooms. HUST-PTF uses three kinds of detectors, Scintillation, Faraday cup and ionization chamber, for the beam parameter measurements. In terms of structure, the HUST PTF beam diagnostic system is built according to the standard distributed three-layer structure, which is divided into hardware device layer, data processing layer and GUI layer. Different protocols are used to communicate between the three layers, which can improve reliability and expand flexibly in each layer. © 2024 International Beam Instrumentation Conference. All Rights Reserved.

关键词： Ionization chambers

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Prediction of Equivalent Icing Thickness of Transmission Lines in Distribution Network 9

Prediction of Equivalent Icing Thickness of Transmission Lin...

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9th Asia Conference on Power and Electrical engineering, ACPEE 2024

作者： Xu, Jiaxin Li, Dayi Dai, Yufeng Xie, Siqi Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350309638

Aiming at the problem that the time series forecasting method will produce a certain degree of lag due to its series autocorrelation, the multivariate equivalent ice thickness prediction using meteorological data as the feature is used. Aiming at the problem that the prediction accuracy of ice thickness is not high, the attention mechanism is used to assign adaptive weights to multi-dimensional feature parameters and time steps to highlight important information in different feature dimensions and time steps. At the same time, due to the change of ice cover with time, a Bi-directional Long Short-term Memory (Bi-LSTM) is used to establish an ice cover prediction model to make use of the past and future information provided at each time point in the process, and for the parameter selection problem of Bi-LSTM, the sparrow search algorithm (SSA) is used to select the hyperparameters to reduce the error caused by human intervention, and then improve the accuracy of line equivalent ice thickness prediction, and finally verify the validity of the model through experimental results. © 2024 IEEE.

关键词： Long short-term memory

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Error field penetration in J-TEXT tokamak based on two-fluid drift-MHD model

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Chinese Physics B 2024年第4期33卷 545-551页

作者：王文徐涛张仪 the J-TEXT team State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

An externally generated resonant magnetic perturbation can induce complex non-ideal MHD responses in their resonant *** have studied the plasma responses using Fitzpatrick's improved two-fluid model and program *** calculated the error field penetration threshold for *** addition,we find that the island width increases slightly as the error field amplitude increases when the error field amplitude is below the critical penetration ***,the island width suddenly jumps to a large value because the shielding effect of the plasma against the error field disappears after the *** scanning the natural mode frequency,we find that the shielding effect of the plasma decreases as the natural mode frequency ***,we obtain the m/n=2/1 penetration threshold scaling on density and temperature.

关键词： plasma responses drift-MHD model error field penetration

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Study on the Phase Evolution of High Temperature Sintering Process of ZnO@Bi2O3 Core-Shell Structure Varistor Ceramic 19th

Study on the Phase Evolution of High Temperature Sintering P...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Yao, Chengfeng Song, Li Zhou, Benzheng He, Junjia State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819613786

The core-shell structure formed by coating can enhance the uniformity of particles within ZnO varistors, which is conducive to the improvement of their microstructure and comprehensive performance. In this study, the ZnO@Bi2O3 core-shell structure powder was prepared by chemical precipitation and calcination purification, and doped with Sb2O3 to form the ZnO@Bi2O3-Sb2O3 (ZBS) system powder, which was then compared with the doped sample. The alloying method was combined with high-temperature X-ray diffraction (HT-XRD) to investigate the phase evolution and its pattern, while scanning electron microscopy (SEM) and X-ray fluorescence (XRF) were employed to characterise the microstructure and elemental distribution. It was observed that the phase evolution of the ZBS system can be divided into two main stages: the generation of pyrochlore and its subsequent transformation to spinel. It is observed that Bi₂O₃ in the core-shell structure samples exhibits a certain selectivity for the reaction that generates the pyrochlore phase. Furthermore, the onset temperature of pyrochlore-to-spinel transformation is lower than that of the doped samples by 80–100 °C, and the reaction rate is faster. Base on the microstructural results, it was found that the core-shell structure powder spinel was more uniformly distributed with a smaller average grain size up to 5.074 μm and a more well-distributed particle size. The influence of the core-shell structure on the high-temperature sintering of ZnO varistor ceramics was discussed in terms of phase situation and microstructure. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Sintering

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Inertial PLL of Grid-connected Converter for Fast Frequency Support

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CSEE Journal of Power and Energy Systems 2023年第4期9卷 1594-1599页

作者： Xiang Guo Donghai Zhu Jiabing Hu Xudong Zou Yong Kang Josep M.Guerrero State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China. Department of Energy Technology Aalborg UniversityAalborg 9220Denmark

Frequency support capability for the grid-connected converter(GCC)is one of the basic safeguards for the stability of renewables-dominated power *** this paper,analogous to the motion equation of a synchronous generator(SG),an inertial phase-locked loop(iPLL)is proposed for GCC to achieve fast frequency *** iPLL introduces the inertial and damping loops into the classic PLL structure to emulate the natural frequency regulation characteristics of a *** with the existing methods,the iPLL has a faster frequency response and is simpler in design and ***,the proposed iPLL method is validated by *** Terms-Frequency support,grid-connected converter,inertial phase-locked loop(iPLL),synchronous generation(SG).

关键词： Frequency support grid-connected converter inertial phase-locked loop(iPLL) synchronous generation(SG).

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The Difference of High-Temperature Sintering Between Surface-Coated and Mechanically Mixed ZnO Composite Powders

The Difference of High-Temperature Sintering Between Surface...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Song, Li Zhou, Benzheng Yao, Chengfeng He, Junjia State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819618552

ZnO varistors prepared by surface coating technology show certain potential in reducing grain size, refining microstructure, and improving electrical properties. The sintering process after powder preparation also has a decisive influence on the performance of the varistor. In this study, based on the simplest binary formulation of ZnO, the common additives SiO2 and Bi2O3 were selected to form ZS and ZB binary system. The surface-coated composite powder and mechanically mixed composite powder were prepared in two kinds of system. The differences of coated powder and mixed powder in sintering process at high temperature were compared from three aspects: powder morphology, thermal analysis, and phase analysis. The results can provide a reference for the sintering process optimization of ZnO coated powder. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Sintering

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Reliability criterion of film capacitor based on moisture diffusion in encapsulation

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High Voltage 2023年第6期8卷 1242-1252页

作者： Zheng Li Hua Li Tian Qiu Fuchang Lin Yucheng Wang School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhanChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina Key Laboratory of Pulsed Power Technology Ministry of EducationWuhanChina

The current reliability criterion(RC)of the film capacitor(FC)is usually a fixed value,which does not consider the staged capacitance loss caused by moisture diffusion under high temperature and/or high *** expected lifetime of capacitors would deviate far from the actual *** moisture diffusion process of the encapsulated FC is ana-lysed based on Fick's second *** order to investigate the capacitance loss and moisture diffusion characteristics,4 types of film capacitors are stressed with AC voltage under different temperatures and *** on the staged analysis of the capacitance and weight gain curves,the effect of moisture diffusion on capacitance loss is *** indicate that the linear stage of capacitance loss corresponds to the Fickian moisture diffusion stage of weight *** effect of voltage on FC aging is the most *** capacitance loss rate increases by 301%when the voltage rises by 30%.An RC calculation method of the FC is further proposed,which could also screen the encap-sulation quality and shorten the aging test duration by at least 80%.

关键词： aging moisture diffusion

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